24 results about "Chip formation" patented technology

The invention belongs to the technical field of cutting machining, and particularly discloses a machining residual stress rapid prediction method and system based on a cross-scale finite element simulation model.The method comprises the steps that in a three-dimensional cutting model of a workpiece, an undeformed section is determined according to the cutting depth, the feeding amount and the geometric shape of a tool, and the machining residual stress is obtained; determining a plurality of section units based on the undeformed section; performing two-dimensional cutting simulation on each section unit to obtain force and heat load distribution of each section unit; carrying out interpolation to obtain force and heat load distribution of the three-dimensional cutting area; and three-dimensional cutting simulation is conducted on the three-dimensional cutting model, no cuttings are formed in the simulation process, the force thermal load directly acts on the machined surface of the workpiece, the cutting and feeding process of the tool is simulated through movement of the force thermal load, and therefore residual stress distribution is obtained through simulation. According to the method, the influence of large grid deformation on the simulation speed can be avoided, so that the residual stress prediction calculation efficiency is improved.

A cutting tool for thread cutting has a thread turning cutting insert releasably retained in an insert pocket by a fastening member. The thread turning cutting insert has a thread cutting portion having three spaced apart cutting teeth. and a chip forming groove recessed in an insert upper surface. The chip forming groove includes a near-flank groove surface close to the cutting teeth and far-flank grove surface further away from the cutting teeth. The thread cutting portion includes three cutting edges formed at the intersection of the insert upper surface and an insert peripheral surface. Each cutting edge is located on a respective cutting tooth. The thread cutting portion includes three planar land surfaces located on the insert upper surface. Each land surface extends from an entire length of a respective cutting edge to the near-flank groove surface.

Examples described herein provide for controlling the trajectory of metal chips during a metal cutting operation. Aspects include determining a predicted metal chip formation pattern during the metal cutting operation of a workpiece. Prior to the initiation of the metal cutting operation, the system sets the orientation of the workpiece, and the cutting tool based on the predicted metal chip formation pattern. During the metal cutting operation, the system observes the actual metal chip formation pattern and adjusts the orientation of the workpiece and the cutting tool to control the trajectory of the metal chips, preventing them from contacting the finished portion of the workpiece. Aspects may also involve controlling an electromagnet to create a magnetic field to adjust the trajectory of the metal chips and determining the direction and speed of a cutting fluid applied by the cutting tool based on the predicted and actual metal chip formation patterns.

To provide a wafer whose chips can be cut out easily even when the number of chips per wafer is increased.SOLUTION: A wafer 1 comprises: a frame part 11 surrounding a chip formation region 10 in which a number of chips 30 are formed; a first crosspiece part 21 whose both ends are connected to the frame part 11; a second crosspiece part 22 whose both ends are connected to the frame part 11 and which crosses the first crosspiece part 21, in the chip formation region 10; a plurality of third crosspiece parts 23 in which the plurality of chips 30 is cuttably provided respectively and which extends in parallel to each other in the chip formation region 10; and fourth crosspiece parts 24a-24d whose one ends are connected to the frame part 11 and whose other ends are connected to the second crosspiece part 22. One ends of the third crosspiece parts 23 are connected to one of the fourth crosspiece parts (24a-24d) and the other ends thereof are connected to the frame part 11 or the first crosspiece part 21.SELECTED DRAWING: Figure 1

Grooving insert (1) with a cutting edge section (3) protruding from a shank (2), which cutting edge section has a front cutting edge (4) and two lateral side cutting edges (5), the front cutting edge (4) and the two side cutting edges (5) each being straight, the chip surface (4) having a front edge region (11) connected to the front cutting edge (4), the front edge region (11) having at least one chip forming element (23) for groove-like chip formation of a chip running off-center over the front cutting edge (4) and being recessed on both sides of the chip forming element (23) to a low point (41) below the front cutting edge (4).With the grooving insert, an already created groove can be widened by a lateral offset of the grooving insert, in that the grooving insert is moved out of the groove and laterally offset by less than the grooving width defined by the cutting edge section and then again grooves radially from the outside to the inside into the workpiece; with regard to the front cutting edge, therefore, only a partial section is used to groove in the area of ​​the front edge area.

The invention relates to a computer-implemented system for automated machining process planning, comprising: a feature extraction module configured to analyze 2D drawings and 3D CAD models to identify machining features; a cutting tool selection module configured to match extracted features with suitable cutting tools; a process planning module configured to generate optimized machining plans; a cutting tool path generation module configured to create efficient cutting tool paths; characterized in that the system further comprises: a parameter optimization module incorporating chip formation physics to refine machining parameters; a collision detection module configured to identify and resolve potential collisions; and means for integrating the modules into a unified software platform.

A cutting tool for thread cutting has a thread turning cutting insert releasably retained in an insert pocket by a fastening member. The thread turning cutting insert has a thread cutting portion having three spaced apart cutting teeth, and a chip forming groove recessed in an insert upper surface. The chip forming groove includes a near-flank groove surface close to the cutting teeth and far-flank grove surface further away from the cutting teeth. The thread cutting portion includes three cutting edges formed at the intersection of the insert upper surface and an insert peripheral surface. Each cutting edge is located on a respective cutting tooth. The thread cutting portion includes three planar land surfaces located on the insert upper surface. Each land surface extends from an entire length of a respective cutting edge to the near-flank groove surface.

The application belongs to the technical field of cutting processing, and particularly discloses a machining residual stress rapid prediction method and system based on a cross-scale finite element simulation model, which comprises the following steps: in a three-dimensional cutting model of a workpiece, determining an undeformed section according to a cutting depth, a feed amount and a tool geometry, determining a plurality of section units based on the undeformed section; performing two-dimensional cutting simulation on each section unit respectively to obtain force-thermal load distribution of each section unit; then, interpolating to obtain force-thermal load distribution of a three-dimensional cutting region; performing three-dimensional cutting simulation on the three-dimensional cutting model, in which no chip is formed, the force-thermal load is directly applied to a machining surface of the workpiece, and movement of the force-thermal load simulates a cutting and feeding process of the tool, so that residual stress distribution is simulated and obtained. The application can avoid the influence of large deformation of a grid on simulation speed, thereby improving residual stress prediction and calculation efficiency.

The application discloses a method for predicting fracture toughness and yield strength of a tough difficult-to-machine material by milling, which comprises the following steps: firstly, a prediction model of the fracture toughness and yield strength of the tough difficult-to-machine material in the process of forming a sawtooth chip by an oblique cutting saw is established; then, a milling test is carried out; and finally, the fracture toughness and yield strength are calculated by combining the prediction model and the test data. The method can avoid the problem that the predicted values of the fracture toughness and yield strength are unreasonable due to the crack blunting of the tough difficult-to-machine material in a standard mechanical test, so that the values of the fracture toughness and yield strength of the tough difficult-to-machine material in a dynamic cutting process can be simply, conveniently, feasibly and universally predicted at the same time.

The utility model provides a drill bit, and belongs to the technical field of machining tools. The drill bit comprises a body. A plurality of spiral grooves are formed in the periphery of the body at intervals; in the first spiral direction, the spiral groove comprises a first spiral groove section and a second spiral groove section, the groove wall of the first spiral groove section is a first cambered surface, and the groove wall of the second spiral groove section is a second cambered surface. According to the drill bit, the first spiral groove section is smoother relative to the second spiral groove section in the first spiral direction, so that the included angle between the groove contour of the first spiral groove section and the tangent point of the core diameter of the body is larger, namely the inflection point of the spiral groove contour is closer to the rear, displacement resistance along the front cutter face of the spiral groove in the chip forming process is reduced, and the cutting efficiency is improved. And the smoothness of upward discharging of the cuttings along the spiral groove is improved, so that the effects of avoiding accumulation and blockage of the cuttings and reducing the drilling torque are achieved.

The invention discloses a vibration cutting machining method and device of a magnetic control spiral micro-nano robot, and the machining method comprises the following steps: carrying out elliptical vibration cutting machining on the surface of a base material, and forming a spiral base body by continuous cuttings generated by machining; and the surface of the spiral base body is coated with a magnetic material, and the magnetic control spiral micro-nano robot is formed. According to the vibration cutting machining method and device for the magnetic control spiral micro-nano robot, the cutting feeding motion is combined with elliptical vibration, so that the machining precision can be improved, and the prepared magnetic control spiral micro-nano robot is more uniform in appearance; the minimum achievable size of the magnetic control spiral micro-nano robot can be reduced, and the limitation of the minimum machining size is broken through; the occurrence rate of fracture and non-uniform deformation can be reduced; the cutting mechanism can be actively regulated and controlled through the synergistic effect of elliptical vibration and feeding movement of the cutter, so that the shape of cuttings is flexibly controlled.

The invention provides a cutting method of a silicon carbide chip, the silicon carbide chip is provided with a plurality of chip forming areas and scribing channel areas for separating the plurality of chip forming areas, a glue material layer is arranged in the scribing channel areas, and the cutting method comprises the following steps: pre-cutting the glue material layer by adopting a laser process to form a cutting groove which at least penetrates through the glue material layer in thickness; and based on the cutting groove, performing a scribing and splitting process on the silicon carbide chip through a scribing wheel and preset stress, so that the plurality of chip forming regions are separated. According to the cutting method, the rubber material layer can be pretreated, cutting deviation caused by the fact that cutting is affected by the rubber material layer is avoided, and the cutting precision is improved.

To provide a wafer which can be properly positioned at a jig or the like, while being avoided from decreasing in the number of chips per wafer.SOLUTION: A wafer 1 comprises: a frame part 11 surrounding a chip formation region 10 in which a number of chips 30 are formed; a first crosspiece part 21 whose both ends are connected to the frame part 11; and a second crosspiece part 22 whose both ends are connected to the frame part 11 and which crosses the first crosspiece part 21, at the central part of the chip formation region 10. A plurality of positioning holes (41 and 42) through which a plurality of pins for positioning the wafer 1 is inserted, is formed in the first crosspiece part 21. Thus the positioning holes (41 and 42) are formed outside the chip formation region 10, which can avoid the number of chips 30 per wafer from decreasing due to the positioning holes (41 and 42).SELECTED DRAWING: Figure 1

The application discloses a kind of ultrasonic auxiliary milling force modeling methods suitable for round corner cutter, three-dimensional cutting force measured by cutting force measuring system is converted to the normal force and friction force suffered by tool rake face, and break through the limitation of traditional right-angle cutter model, innovatively introduce the geometric correction to tool round corner radius, decompose cutting edge into linear segment and circular arc segment respectively for mechanical analysis and synthesis, so that the model can more truly reflect the complex stress state of round corner cutter, significantly improve the calculation precision of normal force and friction force, and has fundamental significance for in-depth study of tribological behavior, wear mechanism and chip formation process.

The invention relates to a cutting tool for machining, in particular for a peeling-like machining process, comprising a chip-forming depression which runs along the cutting edge and in which elevated chip-forming elements are formed. According to the invention, the elevated chip-forming elements have an elongated contour with a length which is greater than the width, in plan view, such that the chip-forming elements have a rising flank and a falling flank. The rising flank, which is longer by comparison, is defined by a rising angle (α) of 3° to 20°, preferably 5° to 10°, and a falling angle (β) of 25° to 45°, preferably 27° to 35°, and the transition between the rising flank and the falling flank is rounded, the radius (R) of said rounded section ranging between 0.05 mm and 1 mm, preferably between 0.25 mm and 0.4 mm.

The invention relates to an ultrasonic torsional vibration auxiliary milling method and device for an aluminum-based composite material. Ultrasonic frequency torsional vibration in the axial direction of the milling cutter is introduced in the conventional milling process, high-frequency micro-amplitude torsional vibration is overlaid while the milling cutter rotates at a high speed, and therefore periodic intermittent cutting is achieved, and the plastic deformation degree of materials and the abrasion rate of the cutter are effectively reduced. An adopted device comprises an ultrasonic vibration generator, an ultrasonic transducer, an amplitude-change pole and a milling cutter assembly. The ultrasonic transducer and the amplitude-change pole are integrally designed, the amplitude-change pole is of a conical structure, spiral inclined grooves are evenly distributed in the periphery of the amplitude-change pole, the amplitude-change pole serves as an ultrasonic cutter handle, one end of the amplitude-change pole is connected with a milling cutter, and stable excitation and efficient transmission of torsional vibration are achieved. According to the device, under the condition of optimized process parameters, the cutting force can be remarkably reduced, the chip forming mechanism is improved, breakage and pulling-out of a reinforced phase material are effectively restrained, and the integrity of the machined surface and the overall process stability are improved.

Provided is a cutting tool with a nozzle. A cutting tool according to the present invention includes a trailing end and a leading end, and a longitudinal central axis extending from the leading end to the trailing end. The cutting tool further includes: at least one chip-forming cutting edge for machining a workpiece; a liquid supply conduit extending from the aft end to a nozzle located aft of the forward working area, where the nozzle includes an inlet in fluid connection with the liquid supply conduit, and where the nozzle includes an outlet. The nozzle has a closed unitary shape, the outer periphery of which is larger than the radial position of the at least one cutting edge. The outlet of the nozzle according to the present invention is configured such that when liquid is supplied through the liquid supply conduit, the liquid ejected from the outlet forms a liquid barrier to prevent cuttings formed during machining from escaping through the barrier.

The present invention discloses an efficient chip-splitting milling cutter that can be used for deep hole expansion processing, and belongs to the technical field of milling cutters. The efficient chip-splitting milling cutter of the present invention comprises a shank and a cutting part, and the cutting part has 4 to 12 circumferentially distributed spiral cutting edges, and the cutting edges have an unequal structure in the circumferential direction, and the difference between the maximum and minimum angles between the end edges of two adjacent cutting edges is 3.5° to 9°; each cutting edge is provided with a plurality of chip-splitting grooves at intervals along the axial direction, and the chip-splitting grooves on each cutting edge are staggered from each other in the axial direction. The efficient chip-splitting milling cutter of the present invention adopts an unequal design combined with a staggered tooth design of the chip-splitting groove, which effectively reduces the vibration during the processing of the chip-splitting milling cutter, is beneficial to the cutting force distribution, improves the processing accuracy and processing efficiency, and can be used for deep hole expansion processing, deep shoulder milling and deep groove milling, etc., and the chip size is controllable, and fine chips can be formed, which is convenient for chip cleaning, and the processing of parts with special requirements for chip formation is more perfect.

The invention relates to a cutting insert (1) having a main body portion (2) and at least one cutting-edge portion (3) projecting from the main body portion (2), by means of which cutting-edge portion a rake face (4) is bordered and which has a front cutting edge (4), two lateral cutting edges (5) and two cutting corners (6), which are interconnected by the front cutting edge (4), wherein the front cutting edge (4) and the two lateral cutting edges (5) are straight, seen in each case in a top view, wherein the rake face (4) has a front face edge region (11) connected to the front cutting edge (4) and an inner region (14) which is connected to the front face edge region (11) and is located above the front cutting edge (4), wherein the front face edge region (11) has at least one chip-forming element (23) for groove-like shaping of a chip which passes off-centre over the front cutting edge (4), said front face edge region sinking on both sides of the chip-forming element (23) to a low point (41) under the front cutting edge (4), wherein the inner region (14) has at least one chip-guiding element (21, 22) for guiding the chip shaped by the chip-forming element (23).

To provide a wafer having a structure in which a number of cuttable chips are formed, which is prevented from being broken due to local stress concentration.SOLUTION: A wafer 1 comprises: a frame part 11 surrounding a chip formation region 10 in which a number of chips 30 are formed; a first crosspiece part 21 whose both ends are connected to the frame part 11; and a second crosspiece part 22 whose both ends are connected to the frame part 11 and which crosses the first crosspiece part 21, in the chip formation region 10. A crossing part 200 where the first crosspiece part 21 crosses the second crosspiece part 22 is larger in the lateral width in the transverse direction of the first crosspiece part 21 in comparison with a first crosspiece part 210 (C1>W1) and is larger in the lateral width in the transverse direction of the second crosspiece part 22 in comparison with a second crosspiece part main body 220 (C2>W2). Thus, the wafer is structured so that the lateral widths (C1 and C2) of the crossing part 200 are large, which enables the crossing part 200 to be easily avoided from being broken due to stress concentration.SELECTED DRAWING: Figure 1

The utility model belongs to the technical field of machining cutters, particularly relates to a high-hardness round-nose milling cutter for titanium alloy machining, and aims to solve the problems that an existing device is not provided with a chip breaker groove, cuttings are difficult to break naturally and are extremely easy to wind on a cutter and a workpiece, cutter abrasion is aggravated, the service life of the cutter is shortened, the quality of a machined surface is affected, and the machining cost is high. According to the technical scheme, the cutting tool comprises a tool handle, a tool body is installed at one end of the tool handle, and a plurality of cutting edges are annularly distributed and fixed to the periphery of the tool body; the cutter has the advantages that the wave-shaped chip breaker grooves efficiently break chips to form a C shape or a short spiral shape, the parabola-shaped chip containing grooves and the spiral chip separating grooves cooperate, the former provides a large chip containing space and guides the chips, the latter divides the chips, winding is avoided, smooth chip removal is guaranteed, the situation that the chips wind a cutter or a workpiece is reduced, local excessive abrasion of the cutter is prevented, and the service life of the cutter is prolonged. The service life of the cutter is prolonged, and the machining precision is also improved.

Examples described herein provide for controlling the trajectory of metal chips during a metal cutting operation. Aspects include determining a predicted metal chip formation pattern during the metal cutting operation of a workpiece. Prior to the initiation of the metal cutting operation, the system sets the orientation of the workpiece, and the cutting tool based on the predicted metal chip formation pattern. During the metal cutting operation, the system observes the actual metal chip formation pattern and adjusts the orientation of the workpiece and the cutting tool to control the trajectory of the metal chips, preventing them from contacting the finished portion of the workpiece. Aspects may also involve controlling an electromagnet to create a magnetic field to adjust the trajectory of the metal chips and determining the direction and speed of a cutting fluid applied by the cutting tool based on the predicted and actual metal chip formation patterns.

A metal cutting indexable drill tool (100) comprising: an elongated drill body (101) having a boring shaft (102) and a mounting shank (103); a center drill insert (104) mounted in an insert seat (106) at a distal end (105) of the boring shaft (102), the insert seat (106) being configured to hold the insert against a bottom of the insert seat (106); a drill flute (107) of the boring shaft (102) being configured to guide and form chips from the center drill insert (104), wherein the drill flute (107) comprises a chip forming surface (108) at a distal end (109) of the drill flute (107); wherein the chip forming surface (108) is perpendicular to a center drill insert (104) and a center drill insert (104) disposed on the center drill insert (104). The bottom of the insert seat (106); and the chip forming surface (108) is arranged at a distance X from the outer corner (110) of the center drill insert (104) to a point (301) on a curve (302), the curve being formed by the intersection of the chip forming surface (108) and an imaginary inscribed sphere (302), wherein the center (303) of the imaginary inscribed sphere coincides with the center of the distal end (105) of the boring axis (102), wherein the radius of the imaginary inscribed sphere is defined by the outer corner (110) of the insert (104); and wherein the distance X divided by the diameter Dc of the drill tool is equal to a chip parameter A, which represents the ratio of the chip diameter to the boring diameter; wherein the chip parameter A is 0.3≤A≤0.5.

A kind of precision machining method of nickel-titanium-iron shape memory alloy pipe joint with annular inner rib, the present application belongs to the technical field of mechanical processing of shape memory alloy.The present application solves the problems that existing nickel-titanium-iron shape memory alloy cutting is difficult, there is poor chip fracture, burr formation and serious tool wear in the process of chip formation, and precision machining of pipe joint cannot be realized.Method:one, cutting;Two, through-hole processing;Three, end face turning;Four, outer circle diameter turning processing;Five, turning processing of inner rib and inner hole.The present application is used for precision machining of nickel-titanium-iron shape memory alloy pipe joint with annular inner rib.