358results about How to "Reduce cutting resistance" patented technology

A cutting insert of the present invention includes a side face having an upper concave portion which is located between an upper face and a lower face and extends up to the upper face, and a plurality of divided upper cutting edges which are located at the intersection of the upper face and the side face, and are divided by the upper concave portion. Each of these divided upper cutting edges includes a first end and a second end, and is inclined being closer to the lower face from the first end toward the second end. The plurality of divided upper cutting edges include a first divided upper cutting edge and a second divided upper cutting edge adjacent to each other. When viewed from side, the first end of the second divided upper cutting edge is located above the intersection of an extension line of the first divided upper cutting edge, and a line which passes through the first end of the second divided upper cutting edge and is parallel to the central axis of the cutting insert, and is located at the same position as the second end of the first divided upper cutting edge, or located therebelow. A cutting tool including the cutting insert, and a method of cutting a workpiece by using the cutting tool are also provided.

A cutting tool is provided which comprises an end cutting edge at an end of a rake face, and a depression formed in the rake face so as to provide the end cutting edge with a concave edge portion.

A ball endmill includes a cylindrical tool body that is to be rotated about its axis, ball-nosed end cutting edges located in an axially distal end portion of the tool body and describing a semi-spherical-shaped locus during rotation of the tool body, and spiral gashes located in the axially distal end portion of the tool body and defining rake faces of the respective ball-nosed end cutting edges. The tool body is made, at least at its part providing each ball-nosed end cutting edge, of a hard sintered body. Each ball-nosed end cutting edge is inclined with respect to the axis by a helix angle in a range from about 10° to about 30°. The tool body has, in its distal end, a non-gashed central area in which the spiral gashes do not exist. A ratio of a size of the non-gashed central area to a ball nose radius is in a range from about 0.03 to about 0.1.

The invention provides a turning method. The method comprises the following step: turning the outer surface of a niobium alloy target material or a niobium alloy target material by adopting a turning tool, wherein the front angle of the turning tool is 20-40 degrees, the rear angle is 4-15 degrees, the main deflection angle is 45-60 degrees, the auxiliary deflection angle is 45-90 degrees, and the blade inclination angle is 10-25 degrees. By selecting the front angle, rear angle, main deflection angle, auxiliary deflection angle and blade inclination angle of the turning tool, cuttings can be discharged from processed surfaces, so that the cuttings are prevented from sticking to the tool, and the cutting difficulty is lowered. The invention further provides a turning tool. The front angle of the turning tool is 20-40 degrees, the rear angle is 4-15 degrees, the main deflection angle is 45-60 degrees, the auxiliary deflection angle is 45-90 degrees, and the blade inclination angle is 10-25 degrees.

An amorphous carbon film is provided with a density of 2.8-3.3 g/cm³. It would be preferable for the film to have: a spin density of 1×10¹⁸-1×10²¹ spins/cm³; a carbon concentration of at least 99.5 atomic percentage; a hydrogen concentration of no more than 0.5 atomic percentage; an inert gas element concentration of no more than 0.5 atomic percentage; and a Knoop hardness of 3000-7000. A mixed layer with a thickness of at least 0.5 nm and no more than 10 nm is formed from a parent material and at least material selected from: B, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. An amorphous carbon film is disposed on the mixed layer or a metallic intermediate layer formed on the mixed layer, thereby increasing adhesion. This amorphous carbon film is formed with solid carbon using sputtering, cathode-arc ion plating, or laser abrasion.

Provided is a tip replacement type rotary tool in which the cutting resistance can be reduced while maintaining a high chipping resistance of a main cutting edge formed on an insert and which is suitable for a highly efficient high-feed cutting. A tip replacement type rotary tool has an insert which is detachably attached to a rotary tool body and which is in the form of a polygonal planar plate or a circular plate in a plan view. The insert is provided with a negative honing and a land, on a rake surface of a main cutting edge of the insert, and a round corner cutter on a corner portion of the insert. When the insert is attached to the rotary tool body, the main cutting edge of the insert defines the lowermost point in the rotation axis direction of the rotary tool body, and the width of the negative honing or the widths of the negative honing and the land are gradually increased from the lowermost point toward the outer peripheral side direction with respect to the rotation axis direction of the rotary tool body, whereby the cutting resistance can be reduced while maintaining a high chipping resistance of the main cutting edge.

The invention discloses an oil groove milling cutter of a hard alloy cold-working mould pressing blank, which comprises a steel basal body (2) and a PCD blade (1), wherein the steel basal body (2) isprovided with 6-12 saw teeth, the number of PCD blade (1) is the same with the number of saw teeth, the back of the saw teeth of the steel basal body (2) is designed into an inclined flat bottom shape, and the PCD blade (1) is welded on the saw teeth of the steel basal body (2). Aiming at the difficult problems of low integrated intensity, hard grains and easy machined surface collapse in the processing process of a hard alloy pressing blank, the invention concretely limits multiple items of geometric parameters of the milling cutter, particularly a geometric angle. When the milling cutter isused for processing an oil groove of the hard alloy cold-working mould pressing blank, the edge of the oil groove can be kept integrated, and the machined surface roughness is kept to be not more thanRa 0.8, solving the difficult problem that the quality of the machined surface can not be ensured when the existing milling cutter is used for processing the hard alloy pressing blank.

A cutting insert of the present invention includes an upper face, a lower face, a side face located between the upper face and the lower face, an upper cutting edge located at the intersection of the upper face and the side face, and a lower cutting edge located at the intersection of the lower face and the side face. The side face includes at least one upper concave part which extends up to the upper face along a thickness direction, and divides the upper cutting edge into a plurality of divided upper cutting edges, and at least one lower concave part which extends up to the lower face along the thickness direction, and divides the lower cutting edge into a plurality of divided lower cutting edges. The aforementioned at least one upper concave part and the aforementioned at least one lower concave part are separated from each other through a thick part being continuous along a width direction of the side face. A cutting tool including the cutting insert, and a method of cutting a workpiece using the cutting tool are also provided.

The invention relates to a diamond compact which comprises a cemented carbide substrate and a diamond composite layer. The diamond compact is characterized in that a boss and strip-shaped flanges protruding upwards are arranged on the end face of the diamond composite layer, and each strip-shaped flange extends upwards to the edge of the boss in an inclined mode from the edge of the diamond composite layer. According to the diamond compact, multiple strip-shaped flanges are arranged, the cutting face has a high ploughing effect, the crushing and drilling performance of the compact is improved, the drilling cutting resistance is reduced, and the penetration speed of a diamond drill bit is increased; meanwhile, the cutting face composed of the strip-shaped flanges, the lateral inclined plane and the boss has high shock resistance; the effect of guiding downhole debris to be discharged can be achieved, and the penetration speed of the diamond drill bit is increased. The cutting face of the compact is larger, abrasion resistance of the compact is further improved, and the service life of the diamond drill bit is further prolonged.

The invention discloses a thin-wall sleeve part processing method which comprises the steps of firstly roughly turning an excircle and drilling and boring an inner hole; after roughly turning the excircle and roughly boring the inner hole to the reserved processing allowance, semi-extractive turning an excircle of a thin-wall sleeve part, obtaining a semi-finished product of the thin-wall sleeve part, and cutting off from a bar material; loading the semi-finished product on a digital controlled lathe, precisely turning an incircle and an excircle of the semi-finished product to the set processing allowance, half cutting-off, reserving the set thickness during half cutting-off after chamfering an excircle of a part at the cut-off end, and semi-extractive turning the excircle to the design dimension again; and thoroughly cutting off the processed thin-wall sleeve part from the semi-finished product. The process method provided by the invention is simple and feasible, no working procedureis increased, the deformation in the part processing process is greatly reduced, the excircle dimension tolerance can be ensured to meet the technical requirement of the process design, the product qualification rate is remarkably improved, the method can be completed by adopting a cutting manner, the production period is short, and no auxiliary fixture with high cost is required to be configured.

The invention relates to a combined height-adjustable coal cutting machine with a small roller and a large mining height, as well as a coal cutting process of the combined height-adjustable coal cutting machine. The combined height-adjustable coal cutting machine comprises a machine body assembly, coal cutting rollers, a travelling mechanism, an auxiliary device, a hydraulic control system and an electrical control system, and is characterized in that combined height-adjusting devices are symmetrically mounted on two side surfaces of the machine body assembly; and each combined height-adjusting device comprises a main height-adjusting oil cylinder, an auxiliary height-adjusting cutting arm and an auxiliary height-adjusting oil cylinder. The coal cutting process adopts a knife inserting method without notch cutting; the coal cutting roller at the front end of the coal cutting machine cuts residual coal bodies under the action of the oscillation of both the main height-adjusting cutting arm and the auxiliary height-adjusting cutting arm, wherein the moving trace is an arc, and the oscillation angle Alpha is at least 90 DEG; and the coal cutting roller at the rear end of the coal cutting machine cuts coal along a bottom plate, wherein the moving trace is a straight line. The coal cutting machine has the advantages that the structure is compact; the size and the weight are smaller; the suitability is strong; the mounting and the transportation are convenient; and the coal cutting machine is suitable for large, middle or small scale of coal mines with large mining heights.

A drill including: a chip discharge flute; and a cutting edge, the cutting edge being made up of a concavely-curved cutting edge portion formed on an inner circumferential side and a convexly-curved cutting edge portion formed on an outer circumferential side, the drill further including a cross section orthogonal to an axial center having a first convex curve corresponding to the convexly-curved cutting edge portion and a first concave curve corresponding to the concavely-curved cutting edge portion intersecting with each other, a flank following the cutting edge on the tip surface having an orthogonal clearance angle β formed within an angular range of 9 to 20 degrees, and a ridgeline of the cutting edge having a chamfer formed with a width CW within a range of 0.002D to 0.02D (where D is a drill diameter).

The invention discloses an asymmetric dynamic balance vertical milling cutter which comprises a cutter shank part and a cutting part, wherein the cutting part comprises more than two peripheral cutting edges and chip flutes, wherein each chip flute is arranged between every two adjacent cutting edges, the sizes of two adjacent chip flutes are different, and an unbalance quantity control step which enables the vertical milling cutter to satisfy the dynamic balance requirement is arranged at the tail of each chip flute. The asymmetric dynamic balance vertical milling cutter has the advantages of high metal removal rate and high processing accuracy and satisfies the requirement for dynamic balance.

This invention relates to a method for preparing Cr-Cu alloy and its application as conductive nozzle or electrode head of welding machine. The Cr-Cu alloy comprises: Cr 0.5-2.0 wt. %, Te 0.01-1.0 wt. %, Cu and impurities. The method comprises: performing solid solution treatment at 940-980 deg.C, and aging at 430-470 deg.C. The Cr-Cu alloy has high hardness, high electric conductivity, and good machinability, and can be used to produce conductive nozzle or electrode head with high accuracy and high quality.

A horizontal type automatic profiling pineapple peeling machine comprises a lead screw drive mechanism, a knife system, a cam mechanism, a synchronous belt drive mechanism, a clamp system and a rack, wherein the lead screw drive mechanism comprises a lead screw motor, a lead screw, a coupler, an A-shaped key, a sliding rail, a sliding block and a fixing block. The knife system comprises a knife, a sleeve, a knife rest, an adjusting screw and a fixing boss. The cam mechanism comprises a profiling cam frame, a cam rod, a supporting rod, a supporting sleeve and a compression spring. The synchronous belt drive mechanism comprises a stepping motor, a small belt wheel, a synchronous belt, a clamp wheel and a B-type key. The clamp system comprises a clamp wheel, a retainer cup, a conical chuck and a telescopic spring. The cam rod of the peeling machine can drive the knife to telescope along an arc line outline of the profiling cam frame, so that the peeling machine can adapt to different shapes of drum-shaped pineapples.

A concrete screw includes a screw head and a rod with a drilling tail section at a distal end thereof. The rod includes a first thread section formed annularly thereon and extended upwards from the drilling tail section, and a second thread section encircling between at least two thread pitches of the first thread section and having an outer diameter smaller than that of the first thread section. The rod further includes a third thread section on an upper end thereof encircling between at least two thread pitches of the first thread section. As the outer edge of the second thread section butts the wall of the screw hole, the first thread section can steadily perform cutting without swaying. Moreover, through the third thread section, compact effect is thereby achieved at a position near the screw head. Hence the concrete screw can provide precise, effort-saving and steady fastening effect.

The invention relates to a stream turbine rotor blade root arc groove roughing milling cutter comprising a cylindrical cutter body, wherein the upper end face of the cutter body in the same circumference is provided a plurality of blade bearings at intervals on which end face cutting blades are arranged; one of the end face cutting blades of any two adjacent blade bearings is arranged on the outer side face of the blade bearing fixed with the end face cutting blade, and the other one of the end face cutting blades is arranged on the inner side face of the blade bearing fixed with the end face cutting blade; the outer periphery and the inner periphery of the cuter body are provided with a plurality with steps symmetrically from top to bottom, wherein the radius of the steps on the outer periphery from top to bottom increases by effect, the periphery of the steps on the inner periphery and the outer periphery is provided with a plurality of cuttings chutes which are sunken towards the wall surface of the cutter body, and the root parts of the cuttings chutes are provided with a tool apron on which a step cutting blade is arranged. The invention has the advantage of high processing efficiency and long service life.