A thread machining insert

Abstract

The utility model discloses a kind of thread processing inserts, including insert body, the center hole and cutting edge part are equipped on insert body, cutting edge part includes rake face, blade angle arc surface and two blade angle side surfaces, two blade angle side surfaces and rake face form two side cutting edges, blade angle arc surface and upper surface form angle cutting edge by intersection;Rake face is gradually sunken by angle cutting edge to center hole direction, and is connected with upper surface by connecting surface;Rake face is equipped with chip pocket, chip pocket is equipped with chip-breaking boss extending to connecting surface, chip pocket and chip-breaking boss are mirror image symmetry distribution relative to the symmetry center line of two side cutting edges.The structure in chip pocket provides enough chip space for processing, effectively reduce the contact area of rake face and chip, reduce cutting temperature, gradually sunken rake face structure, reduce cutting resistance.The position design of chip pocket and chip-breaking boss can meet the needs of chip winding control and smooth chip removal simultaneously.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal cutting processing technical field, concretely relates to a thread processing blade. BACKGROUND

[0002] The thread processing blade in prior art has the control problem of chip in the cutting process, for example, the cutting produced by the side cutting edge lacks correct guidance, causes the chip to flow along the rake face to the connecting curved surface, makes the contact area of the rake face and the chip big, causes the cutting resistance big, the cutting temperature high, still has the problem that the long chip of chip is entangled and blocked, that is, the chip produced by the side cutting edge cannot be forced to lift and curl, is easy to form the long spiral chip that is connected in a chain, is entangled on the tool or workpiece, influences the processing efficiency and surface quality. Especially in high speed cutting or big feed amount processing, the chip control problem is more prominent. Therefore, an urgent need is a thread processing blade that can meet the needs of chip guiding control, curling chip breaking control and smooth chip removal of chip. SUMMARY

[0003] To solve the above technical problems, the utility model provides a thread processing blade.

[0004] The technical scheme of the utility model is: including blade body, the blade body is equipped with center hole and cutting edge part, the cutting edge part includes rake face, angle arc surface and two angle side surfaces, two angle side surfaces and rake face form two side cutting edges, angle arc surface and upper surface form angle cutting edge, the rake face is gradually sunken from the angle cutting edge to the center hole direction, and is connected with the upper surface through the connecting curved surface, the rake face is equipped with chip containing recess, the chip containing recess is equipped with the chip breaking boss extending to the connecting curved surface, the chip containing recess and the chip breaking boss are mirror image symmetry distribution relative to the symmetry center line of two side cutting edges.

[0005] Further, the chip containing recess is spindle-shaped, and is composed of a pair of lateral constraint walls and a connecting bottom plane.

[0006] Further, the lateral constraint wall is a continuous curved surface structure with compound curvature, including a straight line guide part equidistantly parallel to the corresponding side cutting edge and a transition part connecting the straight line guide part.

[0007] Further, the two groups of transition parts of the chip containing recess are gradually connected in the chip flow direction.

[0008] Further, the chip breaking boss includes a boss arc surface and a boss ridge, and the boss ridge is higher than the rake face.

[0009] Further, the chip breaking boss starts from the middle region of the chip containing recess and extends to the connecting curved surface in the chip flow direction.

[0010] Further, the blade body is triangular, and is provided with three cutting edge portions.

[0011] Further, the blade body comprises upper and lower surfaces and a plurality of side surfaces, the cutting edge portions are respectively connected to the side surfaces through two side light trimming edge portions, and the light trimming edge portions comprise light trimming edges which are connected to the side cutting edges through arc surfaces.

[0012] The beneficial technical effects of the utility model are as follows: the chip accommodating groove arranged on the rake face provides sufficient chip accommodating space for cutting processing, is applicable to continuous cutting or high feeding working conditions, the chip accommodating groove effectively reduces the contact area of the rake face and the chip, reduces the cutting temperature, the gradually sinking rake face structure reduces the cutting resistance and prolongs the tool life, the lateral constraint wall of the chip accommodating groove can more smoothly guide the cutting flow, the chip breaking boss arranged in the chip accommodating groove is symmetrically distributed along the angle bisector of the cutting edge angle, can help to meet the winding and discharging effects of different tool feeding modes, the lateral constraint wall with composite curvature improves the chip guiding effect, and the overall structure meets the winding control and smooth discharging requirements of the chip. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the overall structure schematic view of the utility model;

[0014] Figure 2 is the overall structure schematic view of the utility model Figure 1 is the specific structure schematic view of the cutting edge portion and the chip breaking boss in the local A;

[0015] Figure 3 is the overall structure schematic view of the utility model Figure 1 is the specific structure schematic view of the chip accommodating groove in the local B;

[0016] Wherein: 1, blade body; 11, upper surface; 12, lower surface; 13, side surface; 14, center hole; 2, cutting edge portion; 21, rake face; 22, edge angle side face; 23, edge angle arc face; 24, side cutting edge; 25, angle cutting edge; 3, connecting curved surface; 4, chip accommodating groove; 41, lateral constraint wall; 411, straight line guide part; 412, transition part; 42, connecting bottom plane; 5, chip breaking boss; 51, boss arc face; 52, boss ridge; 6, light trimming edge portion; 61, light trimming edge. DETAILED DESCRIPTION

[0017] In order to more clearly understand the technical means of the utility model and can be implemented according to the content of the specification, the specific embodiment of the utility model is further described in detail below, the following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0018] As Figures 1 to 2As shown, the utility model discloses a thread processing blade, including blade body 1, the blade body 1 is surrounded by upper surface 11, lower surface 12 and a plurality of side surface 13, the geometric center of blade body 1 is equipped with the through center hole 14, all sides are equipped with cutting edge part 2, cutting edge part 2 includes rake face 21, two blade angle side surface 22, the blade angle arc surface 23 of transition connection of two blade angle side surface 22 respectively and lower surface 12, two blade angle side surface 22 and rake face 21 form two side cutting edges 24, the blade angle arc surface 23 and upper surface 11 form angle cutting edge 25, the included angle between the two side cutting edges 24 is cutting edge angle, the rake face 21 is gradually sunken to the center hole 14 direction by angle cutting edge 25, and is transitionally connected with the upper surface 11 of blade body 1 by a connecting surface 3.

[0019] In the embodiment, the rake face 21 is provided with chip pocket grooves 4 which are mirror-symmetrically distributed with respect to the angle bisector of the cutting edge angle, the chip pocket grooves 4 are spindle-shaped, and include a pair of lateral constraint walls 41 and a connecting bottom plane 42, the lateral constraint walls 41 are continuous curved surface structures with compound curvature, and are smoothly connected with the rake face 21, the lateral constraint walls 41 include straight line guide portions 411 which are in equidistant parallel relationship with the corresponding side cutting edges 24, and transition portions 412 for connecting the straight line guide portions 411, and two groups of transition portions 412 are gradually connected along the chip flow direction, such as Figure 3 .

[0020] The provision of the chip pocket grooves 4 provides sufficient chip space for cutting processing, effectively receives the chips, and is particularly suitable for continuous cutting or high feed working conditions; moreover, the chip pocket grooves 4 effectively reduce the contact area between the rake face 21 and the chips, reduce the friction resistance and cutting temperature, and prolong the tool life; at the same time, the spindle-shaped structure design and the compound curvature design of the lateral constraint walls 41 can direct the chip discharge, and avoid the disorderly accumulation or winding of the chips.

[0021] The chip pocket grooves 4 are provided with chip breaking bosses 5 which are symmetrically distributed along the angle bisector of the cutting edge angle, the chip breaking bosses 5 are ridge-shaped arc protrusions, and include boss arc surfaces 51 and boss ridge peaks 52, and the boss ridge peaks 52 are higher than the rake face 21. After the chips are guided by the connecting bottom plane 42 of the chip pocket grooves 4, the chips move to the chip breaking bosses 5 and are lifted and curled at the boss ridge peaks 52 to form regular chip breaking. The chip breaking bosses 5 are symmetrically distributed along the angle bisector of the cutting edge angle, which is beneficial to meet different tool feeding modes to achieve chip winding and chip discharge effects.

[0022] The chip breaking boss 5 starts from the middle area of the chip accommodating groove 4 and extends to the connecting curved surface 3 along the chip flow direction, and the boss curved surface of the chip breaking boss keeps a preset distance from the straight guiding part 411 of the chip accommodating groove, so that the chip is stably flowed to the position of the chip breaking boss 5 under the effective accommodation of the chip accommodating groove 4 and is effectively curled and flow-controlled.

[0023] In the embodiment, the blade body 1 is triangular and includes three cutting edge parts 2 for participating in cutting, and is processed by screw locking through the center hole 14 in thread processing, and then is rotated to use another cutting edge part 2 for processing after one cutting edge part 2 is invalid.

[0024] The cutting edge part 2 and the side surface 13 are smoothly and transitionally connected by the two-sided finishing edge part 6, and the finishing edge part 6 includes the finishing edge 61 which is transitionally connected to the side cutting edge 24 by an arc surface, and the finishing edge part 6 is used for finishing the thread groove surface and improving the workpiece surface quality.

[0025] In the cutting process, the chip generated by the side cutting edge 24 flows along the rake face 21 to the center hole 14 of the cutter and gradually sinks into the chip accommodating groove 4. The chip is guided in the chip accommodating groove 4 by the lateral constraint wall 41 and stably flows to the chip breaking boss 5. When the chip contacts the boss ridge 52, the chip is forced to rise and curl to form a controllable spiral or C-shaped chip, and then is broken and branched under the cooperation of the chip breaking boss 5 and the chip accommodating groove 4. The broken chip is smoothly guided along the connecting curved surface 3 to the side of the cutter and is discharged to avoid secondary interference.

[0026] Through the directional guidance of the chip accommodating groove 4 and the forced curling effect of the chip breaking boss 5, the ordered flow, efficient breaking and smooth discharge of the chip are realized, the chip winding and cutting heat accumulation are effectively reduced, and the surface finish and dimensional stability of thread processing are significantly improved.

[0027] The above only describes the preferred embodiments of the utility model, and is not used for limiting the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, on the premise of not departing from the technical principles of the utility model, a plurality of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A thread-cutting insert, comprising an insert body (1), wherein the insert body (1) has a center hole (14) and a cutting edge (2), characterized in that: The cutting edge (2) includes a rake face (21), a rounded edge surface (23), and two side edges (22). The two side edges (22) intersect with the rake face (21) to form two side cutting edges (24), and the rounded edge surface (23) intersects with the upper surface (11) to form an angular cutting edge (25). The rake face (21) gradually sinks from the angular cutting edge (25) toward the center hole (14) and is connected to the upper surface (11) through the connecting surface (3). The rake face (21) is provided with a chip-collecting groove (4), and the chip-collecting groove (4) is provided with a chip-breaking boss (5) extending toward the connecting surface (3). The chip-collecting groove (4) and the chip-breaking boss (5) are both distributed in a mirror symmetrical manner with respect to the symmetrical center lines of the two side cutting edges (24). The chip-bearing groove (4) is spindle-shaped and consists of a pair of lateral constraint walls (41) and a connecting bottom plane (42).

2. The thread-cutting insert according to claim 1, characterized in that: The lateral constraint wall (41) is a continuous curved surface structure with a composite curvature, including a straight guide (411) that is equidistant from the corresponding side cutting edge (24) and a transition part (412) connecting the straight guide (411).

3. A thread-cutting insert according to claim 2, characterized in that: The two sets of transition sections (412) of the chip groove (4) are gradually connected along the chip flow direction.

4. A thread-cutting insert according to claim 1, characterized in that: The chip-breaking boss (5) includes a boss arc surface (51) and a boss ridge (52), the boss ridge (52) being higher than the rake face (21).

5. A thread-cutting insert according to claim 4, characterized in that: The chip-breaking boss (5) starts from the middle region of the chip-containing groove (4) and extends towards the connecting surface (3) along the chip flow direction.

6. A thread-cutting insert according to claim 1, characterized in that: The blade body (1) is triangular and has three cutting edges (2).

7. A thread-cutting insert according to claim 1, characterized in that: The blade body (1) includes an upper surface (11), a lower surface (12) and several side surfaces (13). The cutting edge (2) and the side surfaces (13) are respectively connected by the finishing edge on both sides. The finishing edge (6) includes a finishing edge (61) that is connected to the side cutting edge (24) by an arc surface.

Images