44results about How to "Not easy to chip" patented technology

The invention discloses a sandwich-type polycrystalline diamond compact and a preparation method thereof and a used binding agent. The binging agent is made through matching of Co powders, Ni powders, TaC powders and B powders according to a certain proportion. The sandwich-type polycrystalline diamond compact comprises two layers of cemented carbide matrixes and a polycrystalline diamond layer arranged between the two layers of cemented carbide matrixes. The polycrystalline diamond layer and diamond powders are matched in a certain proportion through the binding agent, the polycrystalline diamond layer and the substrate are composited with each other through high-temperature high-pressure sintering, and a superhard composite material with three layers of materials is formed. The cemented carbide layers play the role of a protecting layer, the stress state of the compact when the polycrystalline diamond layer is drilled in is improved, and tipping is avoided. The nanocrystalline metal binding agent can facilitate sintering in high temperature and high pressure, so that the boding density between the diamond (D-D bond) is improved, a good sintering promoting function is achieved, forming of a tough sintering body is facilitated, the impact toughness, the wear-resisting performance and the heat-resisting performance of the sandwich-type polycrystalline diamond compact are increased, and the technological difficulty of high-wearing feature and high impact toughness of the polycrystalline compact is overcome.

The present invention discloses one kind of cold and hot shearing edge steel for shearing thick plate and its production process. The cold and hot shearing edge steel has properly matched alloy elements and carbon. Its production process includes the following steps: designing alloy, smelting and on-the-spot sample analysis and regulation, ladle refining at 1650-1670 deg.c, casting ingot, forging rod, electroslag remelting and forging into shear edge material. The cold and hot shearing edge steel has high hardness, high strength, high wear resistance, high impact toughness and high red hardness, and is suitable for making shear for shearing cold and hot thick plate.

The invention provides a polycrystalline diamond cubic boron nitride composite sheet. The polycrystalline diamond cubic boron nitride composite sheet comprises a hard alloy substrate, a polycrystalline diamond composite layer, a polycrystalline cubic boron nitride composite layer and a hard alloy protective layer which are sequentially arranged from bottom to top, wherein the polycrystalline diamond composite layer is composed of diamond micro powder and a nano metal binding agent, and the polycrystalline cubic boron nitride composite layer is composed of cubic boron nitride micro powder and ametal ceramic bonding agent. The invention further provides a method for preparing the polycrystalline diamond cubic boron nitride composite sheet. The method comprises the following steps that the diamond micro powder and the nano metal bonding agent are used for preparing a diamond bonding agent mixture; the cubic boron nitride micro powder and the metal ceramic bonding agent are used for preparing a cubic boron nitride bonding agent mixture; the hard alloy substrate is put into a tantalum cup, and the diamond bonding agent mixture and the cubic boron nitride binding agent mixture are sequentially poured into the tantalum cup; and the hard alloy protective layer is put into the tantalum cup, then vacuum heat treatment is carried out, and then high-temperature high-pressure sintering treatment is carried out. The composite sheet has high impact toughness and high strength.

The invention discloses a machining method for a tungsten alloy target material, which comprises the steps of providing a semi-finished product of the tungsten alloy target material and carrying out finish machining on the semi-finished product of the tungsten alloy target material, wherein in the finish machining step, the plane of the tungsten alloy target material is machined by a PCBN (Polycrystalline Cubic Boron Nitride) face mill, and the side face of the tungsten alloy target material is machined by a tungsten steel end mill. By adopting the machining method for the tungsten alloy target material provided by the invention, the arris defect in the machining process is avoided, the machining of the tungsten alloy target material with complex curved surface can be realized, and the problems of long machining cycle and low production efficiency are solved.

The invention relates to the technical field of metal cutting tool manufacturing, and particularly relates to a manufacturing process of an external gear drum type broach fine gear cutter disc. The process comprises the technological steps of blank manufacturing, turning machining, wire cutting rough machining, vacuum heat treatment, cold treatment, surface grinding, rake face grinding, walking wire slowly for inner tooth fine cutting, cutter fine grinding through cylindrical grinding and the like, wherein in the surface grinding working procedure, low-temperature stress-removing aging treatment procedures are arranged between the surface rough grinding and the surface semi-fine grinding and between the surface semi-fine grinding and the surface fine grinding correspondingly to eliminate the surface stress generated in the grinding process so as to reduce the deformation after the surface fine grinding. According to the process, the manufacturing precision of the drum type broach cutter disc is improved, the wear resistance of the cutter disc is improved, and the manufacturing cost of the cutter disc is reduced.

The invention provides a milling cutter used for machining a workpiece to obtain a predetermined contour line. The predetermined contour line comprises a first part and a second part connected with the first part. The milling cutter comprises a cutter handle provided with a center shaft and further comprises a plurality of first cutting edges and a plurality of second cutting edges, wherein the first cutting edges and the second cutting edges are arranged in a stagger mode, the first cutting edges are used for rotating around the center shaft to form a first rotation track to machine the first part of the predetermined contour line of the workpiece, the second cutting edges are used for rotating around the center shaft to form a second rotation track different from the first rotation track to machine the second part of the predetermined contour line of the workpiece, and the first rotation track is connected with the second rotation track. The milling cutter is relatively low in cutting resistance and long in service life.

The invention relates to a machining method for a spindle hole oil groove of a large diesel engine body. The method comprises the following implementation steps that most margins are removed with a short ball milling cutter with the good rigidity; margins of the interference portion are removed with a long ball milling cutter; remaining margins are removed for one time with a three-edge milling cutter, and the groove is finally obtained. The machining method has the advantages that the machining time is short, the machining efficiency is high, the cutters are not prone to be tipped, the using effect is good, and the life is long.

The invention aims to provide a machining technology of a head integral PCD drill bit. Firstly PCD parent metal is welded to a hard alloy handle part, and then the hard alloy handle part is subjectedto diamond grinding wheel grinding; then a copper wheel is utilized to conduct fluting grinding and grinding electrolysis on a head of the PCD parent metal, an excircle of a grinding wheel is adoptedto conduct edge cleaning and electrolysis and edge line producing, in this way, the concentricity of the PCD parent metal and the handle part is ensured; an arc drill point is adopted to conduct grinding electrolysis on an arc slag containing tank, so that force can be borne more stably, and blade breaking is not prone to happening; and finally a four-plane form is adopted to conduct grinding electrolysis on a rear corner, thus force bearing is more stable, and the quality of a radial angle of the drill bit is ensured as well. The produced drill bit can sharply improve the production efficiency for machining titanium alloys, compared with a hard alloy, the rotation speed can be improved, and feeding can be accelerated. Compared with traditional diamond grinding wheel grinding forming, theprecision of the drill bit machined by adopting the technology is high and stable by using the copper wheel.

The invention relates to a cutting knife used for thermal cutting of plastic material. The cutting knife used for the thermal cutting of the plastic material comprises a blade body, and an inclined double-edged cutting edge which is arranged at the lower end of the blade body, the inclination angle alpha of the cutting edge relative to the horizontal line is 22-28 degrees, and the blade is grinded along the feeding direction of the blade by a grinding appliance to form the cutting edge. The cutting edge at least comprises a first level cutting edge and a second level cutting edge, the angle B1 of the first level cutting edge is 21-23 degrees, and the angle B2 of the second level cutting edge is 8-10 degrees. The plastic material cut by the blade is smooth in end face and free of the appearance of burs and silkings, and cutting end face quality of the material can be improved. Besides, in a cutting process, the resistance stressed on the blade is even, the blade is not prone to tipping, not only is the service life of the blade prolonged, but also cutting noise is reduced observably, and the production environment is improved.

The invention discloses a making method of nut crisp fritters and the nut crisp fritters made by the making method, and belongs to the field of food processing. In order to solve the problems that when people eat conventional nut kernels, the nut kernels are knocked and broken with large force so that teeth are damaged possibly, if the nut kernels are swallowed wholly, life risks are caused possibly, besides, seasoning powder is on the external surfaces of the nut kernels, and when people eat the nut kernels, the seasoning powder sticks to hands easily, the invention provides the making methodof nut crisp fritters. The making method comprises the following steps of firstly performing cooking to obtain a sugar solution, then adding nut pieces to the sugar solution, performing cold storage,performing cutting and performing baking. According to the making method disclosed by the invention, the nut kernels are innovatively changed into the nut pieces, and besides, the nut crisp frittersare obtained through subsequent steps of performing cold storage, performing cutting and performing baking; the nut crisp fritters are immediately broken after being bitten, are crisp in mouth feel, can be bitten to be broken without large force when being eaten; and besides, after cold storage and baking, the sugar solution closely coats the surfaces of the nut pieces, so that the nut crisp fritters do not stick to hands when being eaten.

The invention discloses a composite coating PCBN cutting tool and a preparation method thereof. The cutting tool comprises a PCBN tool base body and a composite coating applied to the PCBN tool base body, the composite coating comprises a coating A located on the inner layer and a coating B located on the outer layer, wherein the coating A at least comprises an AlxTi1-xCyN1-y coating prepared through a low-pressure chemical vapor deposition method, and the coating B at least comprises a Ti1-a-bAlaMebN coating prepared by adopting a physical vapor deposition method; and the preparation method comprises the following steps of preparing the PCBN tool base body, depositing the AlxTi1xCyN1y coating by adopting a low-pressure CVD process, and depositing the Ti1-a-bAlaMebN coating by adopting a PVD process. The cutting tool has the advantages of being good in bonding strength between the coating and the base body, high in abrasion resistance, excellent in tipping resistance and the like, theservice life of the tool is long, and stability is good.

The invention provides a discarded type sleeve cutterhead. The discarded type sleeve cutterhead comprises a cutterhead body, a cutter handle, cutter clamps and cutter blades; a transitional bevel edgeis arranged between the cutterhead body and the cutter handle; the end face of the cutter handle is provided with a first hole groove used for mounting a milling cutter handle, and a groove is formedin the end face of the cutter handle, and the milling cutter handle and the groove are mounted in a matched mode; the end face of the cutterhead body is provided with a second hole groove for accommodating cutting chippings, and the bottom end of the second hole groove is provided with a third hole groove for avoiding interference of parts; the end face of the cutterhead body is provided with four protrusion parts, the cutter blade is locked and fixed to the corresponding pair of adjacent protrusion parts, the cutter clamps are mounted on the other pair of adjacent protrusion parts, and the cutter blades are locked and fixed to the cutter clamps; and an included angle of the cutting faces of the adjacent cutter blades is 90 degrees, the cutting edges of the cutter blades are located on the same plane and perpendicular to the axis of the cutterhead body. The discarded type sleeve cutterhead adopts fixed and floating blade edge design, the cutter blades fixed to the cutterhead body canbear large cutting force, the size cannot be adjusted, and the cutter clamps can avoid the situations of vibration edge, poor finish degree and the unstable workpiece size due to uniformity of blank oxide skin by adjusting the size.

The invention discloses an interface, leveling, same-color, anti-cracking and four-in-one substrate matched coating, and relates to the technical field of coatings. The interface, leveling, same-color, anti-cracking and four-in-one substrate matched coating consists of four portions including a mortar leveling layer, a four-in-one substrate, color points and glossy overprint. The four-in-one substrate consists of the following raw materials: water, 100000 celluloses, a multifunctional assistant, ethylene glycol, a coalescing agent, wood fibers, polypropylene short fibers, titanium dioxide, styrene-acrylic emulsion, pure acrylic emulsion, a bactericide, a thickening agent, sand with meshes of 80-100, sand with meshes of 100-120, sand with meshes of 120-180, bentonite and color paste. Afterthe technical scheme is adopted, the interface, leveling, same-color, anti-cracking and four-in-one substrate matched coating has the beneficial effects that the substrate is four-in-one, energy is saved and consumption is reduced, the labor intensity is reduced, the construction period is shortened, the quality of a paint film is improved, the substrate is the paint film dried and synthesized byemulsion, the toughness of the whole paint film is enhanced, the paint film can be used on a wall surface and a wall corner, and is not easy to damage, and corner breakage of the paint film is not easily caused; after the coating is used, the inside of a wall body is not easily soaked in water, and the paint film is not easy to change color or fade; and the coating can be used for construction ofold wall surfaces such as tiles, and the service life is long.

The invention discloses a bimetal road grinding band saw blade. The bimetal road grinding band saw blade comprises a saw blade body and a plurality of groups of saw tooth groups arranged on the saw blade body. Each group of saw tooth groups comprises at least one first saw tooth, and the blade end width of each first saw tooth is greater than the width of the saw blade body in the thickness direction of the saw blade, chamfers are arranged on the two sides, in the width direction, of the blade end of each first saw tooth, and at least one side surface of each first saw tooth is an acute-angledinclined surface. The saw blade has a smooth and level saw cutting surface, a small saw kerf and a high advance, the saw cutting margin can be greatly reduced, the saw blade tooth tip wears slowly, and the service life is long.