A hand-operated implement has a guide bar on which is fitted a cutting chain for cutting mineral and metal materials. The cutting chain is driven around the guide bar by a chain sprocket. The chain sprocket is arranged in a chain sprocket chamber which is delimited by a chain sprocket cover. A cutting element has an outer side facing a sidewall of the chain sprocket cover which lies in a first notional plane. The distance between the sidewall and the first notional plane measured perpendicular to the first notional plane and centrally between the top of the cutting element and the peripheral wall is less than approximately 0.8 cm over at least 30% of the section between a second notional plane containing the central axis of a fixing bolt on the guide bar and the exit opening at which the cutting chain leaves the chain sprocket chamber.

Presented is a concrete saw for sawing into concrete surfaces to provide expansion slots or joints. The concrete saw has powered front wheels and may optionally have powered rear wheels, so that with improved traction the full potential of the motor can be utilized in faster cutting of concrete.

The present invention provides a wire saw which cuts a workpiece using a cutting wire and is capable of adjusting wire tension with high responsiveness. The wire saw includes first and second workpiece cutting units 1A and 1B. Each of the workpiece cutting units 1A and 1B includes a pair of guide rollers 10a and 10b around which a wire W is wound to form a workpiece-cutting wire group. The wire saw further includes a tension detector 18 which detects tension in the wire W between the workpiece cutting units 1A and 1B, and a control device 50. The control device 50 changes a rotational speed of the guide rollers 10a and 10b of at least one of the workpiece cutting units based on the tension detected by the tension detector 18 so as to keep the tension within an acceptable range.

Provided is a gear grinding machine the maintainability of which can be improved and which is capable of being miniaturized. More specifically, provided is a gear grinding machine wherein a threaded grinding stone (17) and a workpiece (W) are engaged with each other and are rotated in this state, resulting in the workpiece (W) being ground, and wherein between a dressing position (P2) where the threaded grinding stone (17) can be dressed and a retreat position (P1) to which a retreat is made from the dressing position (P2) during grinding, a disk dresser (66) which, by being driven into rotation, dresses the threaded grinding stone (17) is swung about an axis (C2) which is parallel to an axis (C1) that is the rotational axis for the workpiece (W) and which intersects, at right angles, the direction in which the threaded grinding stone (17) is fed toward the workpiece (W).

A method of ductile mode machining a component of a plasma processing apparatus wherein the component is made of nonmetallic hard and brittle material wherein the method comprises single point turning the component with a diamond cutting tool causing a portion of the nonmetallic hard and brittle material to undergo a high pressure phase transformation to form a ductile phase portion of the hard and brittle material during chip formation wherein a turned surface is formed from a phase changed material and the turned surface is a grooved textured surface of phase changed material.

A supporting and stabilizing shoe used with a masonry circular power saw. A shoe frame rigidly mounts to the saw's motor frame. A plate that is preferably substantially planar and bifurcated to form two substantially co-planar members with a gap therebetween pivotably mounts to the shoe frame. A spring biases the plate away from the blade, but can be overcome, and an adjustment knob tightens the plate in position relative to the blade. This provides for depth adjustment for the blade and keeps the blade at a desired angle, such as ninety degrees, to the workpiece surface. The plate extends longitudinally from the motor frame beneath the drive mechanism and the blade of the saw to provide a stable surface upon which the saw can rest during use or storage.

The present invention relates to a cutting tool, in particular in the form of a razor blade, a scalpel, a knife, a machine knife, scissors etc., which has a synthetic diamond layer with a cutting edge. The diamond layer thereby consists of fine-crystalline diamond.

This invention relates to a process which may be automated for the manufacture of stone blocks for use as finished landscape stone blocks from quarry stone. The natural stone is quarried from the quarry and split into rectangular blocks, with squared ends and the top and bottom surfaces are ground with a plurality of grooves and ridges of varying heights. The ridges of varying heights are then removed thereby producing a surface having ridges of uniform height and grooves of uniform depth. The blocks may be used to form an architectural wall. The process is also applicable to pavers, steps and coping stones.

The motorized cutter with wheels (10) comprises a motorized cutter (20) and a carriage (30). The motorized cutter (20) is equipped with an engine (24), a blade (22) rotatably driven by the engine (24), and a light-emitting unit (50) that generates laser light (52) in the same plane as the plane of rotation of the blade (22). A roadbed (90) is then cut along a line (X) drawn on the roadbed (90) by operating the motorized cutter with wheels (10) so that the line (X) is irradiated with the laser light (52). It is possible to remove the motorized cutter (20) from the carriage (30) together with the light-emitting unit (50).

A hybrid concrete saw includes a saw blade, an internal combustion engine having an output shaft operably connected to the saw blade, and an electric motor connectable to a battery for receiving power therefrom and having an output shaft operably connected to the saw blade. A transmission is connected to the output shaft of each of the engine and the electric motor and the saw blade. A clutch selectively decouples one of the engine and the electric motor from the transmission. A controller controls operation of the engine and the electric motor. The concrete saw is operable in a first mode where the saw blade is driven solely by the engine, a second mode where the saw blade is driven solely by the electric motor, and a third mode where the saw blade is driven by both the engine and the electric motor.

A method of dressing a wheel using a polycrystalline CVD synthetic diamond dresser, the method comprising: rotating the wheel; and contacting a working surface of the wheel with a working surface of the polycrystalline CVD synthetic diamond dresser, wherein the polycrystalline CVD synthetic diamond dresser is oriented such that a leading edge of the working surface of the polycrystalline CVD synthetic diamond dresser is formed of larger grains than a trailing edge of the working surface of the polycrystalline CVD synthetic diamond dresser.

A method for slicing a workpiece into wafers in which a polyphosphate solution is applied to the workpiece during the slicing process. The method comprises the steps of positioning the workpiece, such as a silicon ingot, in the vicinity of a wire saw that can cut through the workpiece without the use of an abrasive slurry; causing an aqueous polyphosphate solution to contact the workpiece; and causing the wire saw to cut into the workpiece while the polyphosphate solution is in contact with the workpiece. After the workpiece has been cut into wafers, the polyphosphate solution is rinsed off of the wafers. Preferably, the wire saw used in this method is a diamond wire saw.

A chain bar unit for a wall saw is presented herein. The chain bar unit can include a bar configured to receive a circulating chain or wire around a perimeter of the bar. The chain bar unit also can include a driving gear for driving the chain or wire around the bar, the driving gear configured to be coupled to an output shaft of the wall saw. The chain bar unit further includes the bar being tapered from an end proximate to the driving gear to a distal end having a distal end radius, wherein a width of the bar at the proximate end, is at least two times the distal end radius of the distal end.

The present invention provides a wiresaw cutting method comprising cutting a workpiece with a wiresaw while applying an aqueous cutting fluid to the wiresaw from a recirculating reservoir of cutting fluid, monitoring at least one of a chemical property, a physical property, or both, and adjusting the chemical composition of the cutting fluid while cutting the workpiece to maintain the property being monitored. The present invention additionally provides an apparatus to perform the inventive method.

A cutting chain for a hand-operated implement for cutting metal and mineral materials such as a stone cutter has central connecting links which are connected to one another by lateral connecting links. The central connecting links comprise first central connecting links which each have a drive tooth. The cutting chain has two central connecting links with drive teeth shaped differently to the drive teeth on the first central connecting links; or located a different distance from the leading drive teeth; or having no drive teeth. A hand-operated implement for cutting mineral materials has a drive motor which drives the cutting chain around a guide bar by a drive sprocket. The cutting chain is guided round part of the circumference of the drive sprocket and round a nose sprocket on the guide bar. The drive sprocket or nose sprocket have different first and second areas matched to the cutting chain.

Systems and methods are disclosed for connecting an ingot to a wire saw with an ingot holder, a bond beam, and a bar. The bar has an angled mating surface that engages a recessed surface formed in a slot of the bond beam. Mechanical fasteners are used to connect the tee bar to the ingot holder. The angle of the mating surface with respect to the recessed surface of the slot prevents deformation of the bond beam and prevents compromising the integrity of the adhesive bond between the ingot and the bond beam.

A method for cooling a cylindrical workpiece during wire sawing includes applying a liquid coolant to a surface of the workpiece. The workpiece is made of semiconductor material having a surface including two end faces and a lateral face. The method includes sawing the workpiece with a wire saw including a wire web having wire sections arranged in parallel by penetrating the wire sections into the workpiece by an oppositely directed relative movement of the wire sections and the workpiece. Wipers are disposed so as to bear on the surface of the workpiece. The temperature of the workpiece is controlled during the wire sawing using a liquid coolant applied onto the workpiece above the wipers so as to remove the liquid coolant with the wipers bearing on the workpiece surface.

There is provided a method of cutting or drilling workpiece including stone such as marble and granite, brick, concrete and asphalt, using a frame gang saw. There are provided a workpiece cut by a frame gang saw that includes one or a plurality of blades having multiple cutting tips or that includes a blade without including a cutting tip; a method of cutting the workpiece by using a frame gang saw; and a product provided by the cutting method. The workpiece is provided to include one or more grooves into which at least a portion of at least one cutting tip among the multiple cutting tips or at least a portion of the blade without a cutting tip is inserted and which is formed in a surface thereof. Here, an initial cutting time on a workpiece may be shortened to greatly improve productivity and the quality of a product and a lifespan of a frame gang saw blade may be improved by significantly decreasing deflection in the blade.

The present invention provides a method of cutting a workpiece efficiently with high accuracy by utilizing tension adjusters to approximate tension in a wire in a wire saw to a predetermined target tension while effectively reducing only tension in a winder-side wire. The method comprises a forward-driven cutting step of cutting a workpiece while moving a wire forward, a first switching step of reversing a driving direction of the wire, a backward-driven cutting step of cutting the workpiece while moving the wire backward, and a second switching step of reversing a driving direction of the wire and returning to the forward-driven cutting step, the steps being repeated in this order. In both switching steps, only tension in a winder-side wire is reduced by tension manipulators. A reduction in target wire tension therefor is performed after completion of deceleration of the wire in each switching step.

A supply device for a handheld power tool for a cutting grinder includes a cutting tool and a protective cover which at least partially surrounds the cutting tool. The supply device includes a U-shaped element which can be arranged on the protective cover and via which a fluid medium can be supplied to the cutting tool. The U-shaped element has a connection piece on which a coupling element can be arranged. On the coupling element a pipeline can be connected via which the fluid medium can be supplied to the U-shaped element through the connection piece. The coupling element can be turned about the axis of rotation of the connection pieces.

A saw apparatus for sawing paving slabs has a frame mounted on a ground contacting propulsion member such that the frame may move above a slab to be cut without touching the slab. A first saw support assembly disposes a blade of a saw in cutting engagement with the slab for a transverse cut. A second saw support assembly disposes a blade of another saw in cutting engagement with the slab for a longitudinal cut. The saws are mounted on the saw assemblies and the saw assemblies are mounted on the frame and the frame is mounted on the ground contact propulsion members such that no part of said frame need contact the slab during cutting.

An apparatus, a system and a method may use a diamond-impregnated wire loop to cut an underwater pipeline. The apparatus may have a frame, a carriage attached to the frame and/or pulleys connected to the carriage. The diamond-impregnated wire loop may be connected to the pulleys. The carriage may move relative to the frame to direct the diamond-impregnated wire loop in a forward direction relative to the frame and/or through the pipeline.

An outer blade cutting wheel comprising an annular thin disc base of cemented carbide and a blade section of metal or alloy-bonded abrasive grains on the outer periphery of the base is provided. The abrasive grains are diamond and/or cBN grains having an average grain size of 45-310 μm and a TI of at least 150. The blade section includes overlays having a thickness tolerance (T3max−T3min) of 0.001 mm to 0.1×T2 mm. The blade section has a roundness (ODmax/2−ODmin/2) of 0.001 mm to 0.01×ODmax mm.

The invention relates to a device for dressing a grinding wheel, comprising a sleeve to hold a corundum rod laterally and to guide it along its longitudinal axis, a ram to apply constant thrust force onto the corundum rod held in place and guided in the sleeve, to bring it into contact with the grinding wheel, means of rigidly connecting the ram shaft to the end of the corundum rod, and linear guide means for the sleeve for translating the corundum rod parallel to the axis of the grinding wheel while keeping the rod pressed against the grinding wheel with a constant force. Application to a centerless grinder in which the grinding wheel is used to grind nuclear fuel pellets.

A novel cutting method and apparatus includes a cutting blade adapted to consistently and easily form a desirable kerf in a concrete substrate while capturing substantially all resulting concrete dust.

Disclosed is a cast pin equipped with circular grooves which are provided at any location. The cast pin (10) is equipped with: an outer tube (11) in the shape of a hollow body the tip of which is closed; an inner tube (20) inserted into the outer tube (11); and a cooling medium pipe (30) that is inserted into the inner tube (20) and supplies a cooling medium to the interior of the inner tube (20). Three circular grooves (22) are formed at prescribed intervals in the longitudinal direction, for example, on the outer circumferential surface (21) of the inner tube (20). The circular grooves (22) are formed in the outer circumferential surface (21) by applying a cutting tool from the radial outward direction of the inner tube (20).

An arrangement for a continuous casting process. The arrangement includes a vessel having a first opening for receiving molten metal in the vessel, a second opening for discharging the molten metal from the vessel, and a body extending between the first opening and the second opening, a first magnetic arrangement attached to the body, the first magnetic arrangement having a magnetic core with legs, and coils arranged around the legs, and a power system configured to provide an alternating current superimposed on a carrier current to each of the coils, each pair of alternating current and carrier current provided to a coil forming a flow control current, wherein flow control currents provided to adjacent coils are phase shifted relative each other, thereby creating a travelling magnetic field in molten metal in the vessel. A corresponding method is also presented herein.

The invention relates to a method for the vertical semi-continuous direct chill casting of composite billets or plates comprising at least two layers of aluminum alloys, using a separator which is in contact with the solidification front and which provides a seal between the two alloys during casting, said separator being vibrated while it is in contact with the solidification front, so that the separator is not frozen in and entrained by the solid metal. The invention also relates to a device that can be used to carry out said method.

The present invention is a method for manufacturing a titanium ingot (30), the method being characterized by comprising: a step of melting a titanium alloy for a predetermined time by cold crucible induction melting (CCIM); a step of supplying molten titanium (6) to a cold hearth (10), and separating high density inclusions (HDIs) (8) by precipitation in the cold hearth (10) while spraying a plasma jet or an electron beam onto the bath surface of the molten titanium (6); and a step of supplying a molten titanium starting material from which the HDIs (8) are separated by precipitation to a mold (20) to obtain the titanium ingot.

Arnold (13) includes a recessed portion (21) for receiving a melt (2). The recessed portion (21) is constituted by an inner wall surface (29) for converting the melt (2) into a solidified portion when the inner wall surface (29) contacts the melt (2), and opens in a withdrawal direction (D1) of the solidified portion. A curved line formed by a first contour (23p) and a second contour (25p) has a cusp at a position of start points (43 and 45). The distance between the first contour (23p) and the second contour (25p) in a width direction (D2) increases continuously from an upstream side to a downstream side of the withdrawal direction (D1). The shape of the inner wall surface (29) of the recessed portion (21) is determined so that a cast rod (3) can be rotationally displaced clockwise or counterclockwise about an axis passing through a first end point (33) or a second end point (35) and perpendicular to a section of the mold 13.

A computer executing a software algorithm may be used to detect a depression in a temperature profile. The temperature profile may be smoothed to eliminate noise. Next, the temperature profile's center may be extracted. A polynomial may be fitted to extracted data. An algorithm used to fit the polynomial may guarantee that the fitted curve's peak may be below the actual temperature data's peak. Next, residuals may be calculated by subtracting the fitted curve from the actual data. If there is a dip at the center, then the residuals in the center may be less than zero. The software algorithm executing on the computer may then make a decision based on a sign of the residuals. For example, residuals less than zero may indicate bar porosity. Residuals above zero may indicate no porosity. The magnitude of the residuals may then be used to classify a size of a detected defect.

Metal alloy injection molding techniques are described. In one or more implementations, these techniques may also include adjustment of injection pressure, configuration of runners, and/or use of vacuum pressure, and so on to encourage flow of the metal alloy through a mold. Techniques are also described that utilize protrusions to counteract thermal expansion and subsequent contraction of the metal alloy upon cooling. Further, techniques are described in which a radius of edges of a feature is configured to encourage flow and reduce voids. A variety of other techniques are also described herein.

Various embodiments provide systems and methods for casting amorphous alloys. Exemplary casting system may include an insertable and rotatable vessel configured in a non-movable induction heating structure for melting amorphous alloys to form molten materials in the vessel. While the molten materials remain heated, the vessel may be rotated to pour the molten materials into a casting device for casting them into articles.

A receiving housing of a hydraulic tensioning device for a traction mechanism drive in an internal combustion engine, having an opening that extends along a longitudinal axis for receiving a piston that is implemented for deflecting a tensioning rail of the traction mechanism drive. The receiving housing is a cast component, and the opening comprises an inner contour having an inner surface that comprises at least first segments and inclines for removing the workpiece from the mold in the opening. The second segments include surfaces that are directed into the inside of the opening and are aligned in parallel with the longitudinal axis. A sliding core is also provided that has an outer contour that is complementary to the inner contour of the opening of the receiving housing and fits into the opening. A traction mechanism drive and tensioning device having a receiving housing of this type are also included.

A method for manufacturing micrometer scale components comprises depositing a first metal on a substrate, depositing a second metal in a mold, and alloying the first and second metals together to form the component.

Molten metal of a first composition is fed into a mold cavity, via a first control apparatus, wherein the control apparatus is open, wherein the feeding includes at least flowing out of a first feed chamber. The first control apparatus is closed. A second control apparatus is opened. Molten metal of a second composition is fed into the mold cavity, via the second control apparatus, wherein at least a portion of the metal of the first composition in the mold cavity is sufficiently molten so that an initial feed of molten metal of the second composition mixes with the molten metal of the first composition in the mold cavity, wherein the feeding includes at least flowing out of a second feed chamber, wherein the second composition is different from the first composition. An ingot is removed from the mold cavity, wherein the ingot as a top section, a middle section, and a bottom section, wherein the bottom section is composed of metal of the first composition, wherein the top section is composed of metal of the second composition, wherein the middle section is composed of a mixture of metal of the first composition and the second composition.

A method for the production of a hollow body from die casting aluminum in a die casting machine with a die casting die having mould parts with a stationary mould part and with at least two movable mould parts. The movable mould parts are guided in at least one further movable mould part of the die, so that, in the closed position of the die, the movable mould parts are blocked at least by way of an interlock which is attached to the stationary mould part.

The core sand filling device includes the core box, a blow head which is placed below the core box so as to move up and down in a relative manner to the core box and divided into a sand blowing chamber and a sand storage chamber that are communicatively connected to each other, a compressed air supply unit which is communicatively connected to the sand storage chamber and supplies compressed air into the sand storage chamber, an aeration air supply unit which is communicatively connected to the sand blowing chamber and supplies into the sand blowing chamber aeration air for suspending and fluidizing core sand inside the sand blowing chamber, and an exhaust valve which is communicatively connected to the sand blowing chamber and exhausts compressed air remaining in the sand blowing chamber.

A multi-wall ceramic core for casting an airfoil with one or more internal cooling passages is made by preforming at least one fugitive core insert to have a joint-forming surface with a male and/or female joint feature and then forming at least one fugitive core insert in-situ adjacent and integrally connected and fused to the at least one preformed core insert at the joint-forming surface to form an interlocked, fused joint to form a composite core insert that includes features to form internal passage surfaces in the core when the composite core insert is removed. Another aspect involves preforming first and second fugitive core inserts to have respective joint-forming surfaces with respective snap-fittable joint features and assembling the first and second fugitive core inserts to form a composite core insert by snap fitting the snap-fittable joint features together to form an interlocked joint. The composite core insert is placed in a core molding die cavity, and a fluid ceramic material is introduced into the die cavity to form the ceramic core body incorporating the fugitive composite core insert therein.

The invention concerns a bearing component (Ia, Ib, 1, 7, 9) for a rolling (13, 14, 16) or sliding bearing (19), wherein the bearing component (Ia, Ib, 1, 7, 9) is one of an inner ring (Ia, 1), an outer ring (Ib, 7), a rolling element (9), a cage, or a guide ring. The bearing component (Ia, Ib, 1, 7, 9) comprises a first material (2), and a second material (3) joined to the first material (2), wherein the second material (3) and the first material (2) having been joined by a semi-solid metal process.

A nickel strip is made from a starting material of solid cathode sheets having a minimum nickel content of 99.94% by weight and a maximum trace element content, in ppm by weight, of

An apparatus for press casting includes a casting mold formed of a fixed mold and a first moving mold operable to move relative to the fixed mold. The apparatus further includes a second moving mold operable to move relative to the first moving mold. A mold cavity, which forms a cast product, is configured by the fixed mold and the second moving mold. When the first moving mold is moved to a first predetermined position, a molten metal passage and a gas exhaust port, which communicate with the mold cavity, are formed at positions outside the mold cavity. A communication between the mold cavity and the molten metal passage, and the gas exhaust port is cut off by the second moving mold when the second moving mold is moved to a second predetermined position while the first moving mold is maintained at the first predetermined position thereof.

Provided herein are various embodiments of systems for casting thin metal plates and sheets. Typical embodiments include layers of mold cavities that are oriented vertically for casting the metal plates. In some embodiments, the mold cavities include a beveled edge such that the plates that are cast have a beveled edge. In some embodiments, the mold cavities are filled with a molten metal through an open horizontal edge of the cavity. In some embodiments, the mold cavities are filled through one or more vertical feed orifices. Further disclosed are methods for forming a thin cast metal plate or sheet where the thickness of the cast part is in a range from 0.005 inches to 0.2 inches, and the surface area of the cast part is in a range from 16 square inches to 144 square inches.

The embodiments described herein relate to methods and apparatus for counter-gravity formation of BMG-containing hollow parts. In one embodiment, the BMG-containing hollow parts may be formed by first feeding a molten metal alloy in a counter-gravity direction into a mold cavity to deposit the molten metal alloy on a surface of the mold cavity and then solidifying the deposited molten metal alloy.

A new method for continuous casting of molten metal is provided that allows one to obtain an intermediate product such as slab, billet wire, etc. before subsequent thermomechanical treatment (e.g. lamination or annealing), such that its chemical composition is modified by the addition of elements in order to give it greater mechanical strength.

Disclosed is a vessel for melting and casting meltable materials. The vessel may be a surface temperature regulated vessel for providing a substantially non-wetting interface with the molten materials. In one embodiment, the vessel may include one or more temperature regulating channels configured to flow a fluid therein for regulating a surface temperature of the vessel such that molten materials are substantially non-wetting at the interface with the vessel. Disclosed also includes systems and methods for melting and casting meltable materials using the vessel.

A method for interlocking structural steel components with a metal-filled interlock is disclosed herein. The method comprises placing a mold about aligned contoured portions of structural steel components and attaching a crucible and a spout to the mold. The crucible is charged with exothermic reactive metals which are ignited, forming a molten metal filler. The molten metal filler melts a metal plug in the crucible or spout and the molten metal filler flows into the mold and about the aligned contoured portions of the structural steel components. Cooling of the molten metal filler forms a metal-filled interlock. Molds for performing the disclosed method are also disclosed herein.

A non-electroslag remelting type clean metal ingot mold includes an ingot mold body and a insulating riser arranged on the ingot mold body; an insulated heating and heat preservation device is vertically arranged in the ingot mold body and divides the space in the ingot mold body into a plurality of independent cavity units; and the cavity units are distributed in two rows in the ingot mold body. Because the insulated heating and heat preservation device is arranged in the ingot mold body and divides the space in the ingot mold body into a plurality of independent cavity units, most of impurities and segregates in liquid metals are enriched in the part in contact with the isolation and heat insulation mechanism during the directional solidification and crystallization of the liquid metals and the enriched alloy segregates, and the impurities can be easily eliminated by utilizing flame or other processing methods.

A clean metal ingot mold comprises an ingot mold body and an insulating riser arranged on the ingot mold body. The bottom mold plate of the ingot mold is provided with at least a ridge connected thereto. The region having a V-shape containing impurities produced during the crystallization process of the liquid metal moves upwards because of the ridge, and then the impurities depart from the center of the cast ingot and the impurities are more centralized. A water-cooling device is arranged in the ridge to allow the temperature of the metal in the ingot mold to decrease rapidly, and the crystallization process of the metal to be rapid.

Disclosed is an aluminum-diamond composite having both high thermal conductivity and thermal expansion coefficient close to those of semiconductor elements, which is improved in platability in the surface and surface roughness so that the composite becomes suitable for use as a heat sink of a semiconductor element of the like. Specifically disclosed is a plate-like aluminum-diamond composite containing diamond particles and a metal mainly composed of aluminum. The aluminum-diamond composite is composed of a composite part and surface layers formed on both sides of the composite part, and the surface layers are composed of a material containing a metal mainly composed of aluminum. The diamond particle content is 40-70% by volume of the entire aluminum-diamond composite.