An indexable thread processing insert

Abstract

The invention discloses an indexable thread processing insert, comprising an insert body, wherein a center hole penetrating an upper surface and a lower surface is provided on the insert body, a V-shaped thread cutting edge is provided at a tip of a tool at a junction of two side surfaces, a front cutting surface of the V-shaped thread cutting edge is formed on the upper surface, a first chip guide boss and a second wave chip guide curved surface are provided in sequence along the direction of the tool tip toward the center hole on the front cutting surface, the first chip guide boss extends along the direction of the tool tip toward the center hole and is symmetrically distributed about an angle bisector of the V-shaped thread cutting edge, a plurality of curved surface grooves continuously and evenly distributed along the direction of the tool tip toward the center hole are further provided on the front cutting surface, each curved surface groove intersects with the first chip guide boss, a plurality of curved surface grooves extend to the second wave chip guide curved surface, an extension direction of the second wave chip guide curved surface forms an angle α with the angle bisector of the V-shaped thread cutting edge, and the angle α should satisfy: 60°≤α≤120°. The invention has the advantages of smooth chip removal, high surface finish of thread processing, high processing efficiency, and the like.

Description

Technical Field

[0001] The invention mainly relates to the field of metal cutting, and in particular to an indexable thread machining insert. Background Art

[0002] During the thread turning process, all cutting edge parts of the cutting edge participate in the cutting at the same time, and as the cutting depth increases, the cross-section of the chip gradually widens as the number of feeds increases, making it difficult for the chip to break and very easy to entangle the workpiece, tool and fixture. In addition, due to the particularity of the edge shape of the thread processing blade, that is, the specification standard of the thread limits the edge shape, the blade tip strength is low, the chip is long and not easy to break, and it is easy to entangle on the workpiece. As the workpiece rotates at high speed, it is easy to cause blade chipping, reduced finish of the threaded workpiece, and difficulty in cleaning, which affects the processing quality and efficiency and increases the labor intensity of the operator. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an indexable thread machining insert with smooth chip removal, high thread machining surface finish and high machining efficiency.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A kind of indexable thread processing insert comprises a insert body, the insert body is surrounded by an upper surface, a lower surface and multiple side surfaces, the insert body is provided with a center hole penetrating the upper surface and the lower surface, a V-shaped thread cutting edge is provided at the tip of the tool at the junction of the two side surfaces, the front cutting surface of the V-shaped thread cutting edge is formed on the upper surface, a first chip guide boss and a second corrugated chip guide surface are provided in sequence along the direction of the tool tip toward the center hole on the front cutting surface, the first chip guide boss extends along the direction of the tool tip toward the center hole and is symmetrically distributed about the angular bisector of the V-shaped thread cutting edge, the front cutting surface is also provided with a plurality of curved surface grooves continuously and evenly distributed along the direction of the tool tip toward the center hole, each of the curved surface grooves intersects with the first chip guide boss, and a plurality of the curved surface grooves extend to the second corrugated chip guide surface, the extension direction of the second corrugated chip guide surface forms an angle α with the angular bisector of the V-shaped thread cutting edge, which should satisfy: 60°≤α≤120°.

[0006] As a further improvement of the above technical solution:

[0007] The second wavy chip guide surface includes at least a first protrusion and a second protrusion, the first protrusion is directly opposite to and connected to the first chip guide boss, the second protrusion is on the same side as the polishing long side of the indexable thread processing insert and opposite to the V-shaped thread cutting edge, and the angle between the second protrusion and the V-shaped thread cutting edge is θ1, which should satisfy: 0°≤θ1≤5°.

[0008] Two ends of the second wave-shaped chip guiding surface extend to two adjacent side surfaces of the insert body respectively.

[0009] The included angle α between the extension direction of the second wave-shaped chip guiding surface and the angle bisector of the V-shaped thread cutting edge is 90°.

[0010] An angle λ formed between the extension direction of the first chip guiding boss and the upper surface should satisfy the following: 10°≤λ≤35°.

[0011] The curved groove is symmetrical about the angular bisector of the V-shaped thread cutting edge, and the distance between both ends and the V-shaped thread cutting edge is L1, which should satisfy: 0.05mm≤L1≤0.2mm, and there is an angle β between the line connecting the end points of each curved groove and the V-shaped thread cutting edge, which should satisfy: 0°≤β≤5°, and the bottom surface of the curved groove is parallel to the front cutting edge and the distance between the two is H, which should satisfy: 0.05mm≤H≤0.12mm.

[0012] The distance between the curved groove closest to the tool tip and the tool tip is L2, and h is the thread tooth height, which should satisfy: 1 / 2h≤L2≤h.

[0013] The intersections of the curved groove and the first chip guiding boss are all arc transitions.

[0014] The transverse cross-section of the curved groove is V-shaped or semicircular, and the depth of the curved groove is S, which should satisfy: 0.02mm≤S≤0.08mm.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The indexable thread processing insert of the present invention has a first chip guide boss and a second wave chip guide curved surface sequentially arranged on the rake face along the direction from the tool tip to the center hole, the first chip guide boss extends along the tool tip to the center hole and is symmetrically distributed about the angular bisector of the V-shaped thread cutting edge, and a plurality of curved surface grooves continuously and evenly distributed along the direction from the tool tip to the center hole are also arranged on the rake face, each curved surface groove intersects with the first chip guide boss, and a plurality of curved surface grooves extend to the second wave chip guide curved surface, and the extension direction of the second wave chip guide curved surface forms an angle α with the angular bisector of the V-shaped thread cutting edge, which should satisfy the following: 60°≤α1≤120°, and the first chip guide boss can effectively guide the chips to be lifted and rolled The first chip guide boss is curved to prevent the chips from flying out directly and flowing to and wrapping around the machined surface or the tool. The multiple curved grooves on both sides of the first chip guide boss can make the chips curl and flow along the curved grooves and be discharged from the side of the tool. When processing to the large cutting depth later, the chips pass through or cross the first chip guide boss and directly collide with the second corrugated chip guide surface, so that the chips curl and flow out along the side of the tool, which can effectively reduce the chips from flying around and wrapping around the workpiece or the tool and affecting the quality of the machined surface. During cutting, the double chip guide structure of the present invention can make the chips discharged smoothly, the processing is light and fast, the thread processing surface has a high finish, the contact area between the chips and the upper surface of the blade is reduced, the heat dissipation is fast, and the processing efficiency and safety are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the indexable thread processing insert of the present invention.

[0018] Figure 2 It is a top view of the indexable thread machining insert of the present invention.

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 yes Figure 2 BB view in.

[0021] Figure 5 yes Figure 2 The CC view in .

[0022] Figure 6 yes Figure 2 DD view in .

[0023] Figure 7 It is a stereoscopic view of the indexable thread machining insert of the present invention from another perspective.

[0024] The symbols in the figure represent:

[0025] 1. Blade body; 11. Upper surface; 12. Lower surface; 13. Side; 2. V-shaped thread cutting edge; 21. Rake face; 3. Center hole; 4. First chip guide boss; 5. Second wave chip guide surface; 51. First raised portion; 52. Second raised portion; 6. Curved groove; 61. First curved groove; 62. Second curved groove; 63. Third curved groove; 64. Fourth curved groove; 7. Polishing long edge. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figures 1 to 7 An embodiment of an indexable thread processing insert of the present invention is shown, the indexable thread processing insert of this embodiment includes a insert body 1, the insert body 1 is surrounded by an upper surface 11, a lower surface 12 and a plurality of side surfaces 13, a center hole 3 penetrating the upper surface 11 and the lower surface 12 is provided on the insert body 1, a V-shaped thread cutting edge 2 is provided at the tip of the tool at the junction of the two side surfaces 13, a front cutting surface 21 of the V-shaped thread cutting edge 2 is formed on the upper surface 11, a first chip guide boss 4 and a second wavy chip guide curved surface 5 are provided in sequence on the front cutting surface 21 along the direction from the cutting tip to the center hole 3, the first chip guide boss 4 extends along the direction from the cutting tip to the center hole 3 and is symmetrically distributed about the angular bisector of the V-shaped thread cutting edge 2, a plurality of curved surface grooves 6 are also provided on the front cutting surface 21 that are continuously and evenly distributed along the direction from the cutting tip to the center hole 3, each curved surface groove 6 intersects with the first chip guide boss 4, and a plurality of curved surface grooves 6 extend to the second wavy chip guide curved surface At the surface 5, the extension direction of the second corrugated chip guide surface 5 forms an angle α with the angular bisector of the V-thread cutting edge 2, which should satisfy: 60°≤α≤120°. The first chip guide boss 4 can effectively guide the chips to be lifted and curled, and prevent the chips from directly flying out and flowing to and wrapping around the machined surface or tool. The multiple curved grooves 6 on both sides of the first chip guide boss 4 can make the chips curl and flow along the curved grooves and be discharged from the side 13 of the tool. When the cutting depth is large later, the chips pass through or cross the first chip guide boss 4 and directly collide with the second corrugated chip guide surface 5, so that the chips are blocked and curled and flow out along the side of the tool, which can effectively reduce the chips from flying around and wrapping around the workpiece or tool, affecting the quality of the machined surface. During cutting, the double chip guide structure of the present invention can make the chips be discharged smoothly, the processing is light and fast, the thread processing surface has a high finish, the contact area between the chips and the upper surface of the blade is reduced, the heat dissipation is fast, and the processing efficiency and safety are improved.

[0028] In this embodiment, there are four curved grooves 6 , which extend along the tool tip toward the center hole 3 and are respectively a first curved groove 61 , a second curved groove 62 , a third curved groove 63 and a fourth curved groove 64 .

[0029] In this embodiment, the second corrugated chip guide surface 5 comprises at least a first protrusion 51, a second protrusion 52 and a third protrusion 53. The first protrusion 51 is directly opposite to and connected to the first chip guide boss 4, the second protrusion 52 is on the same side as the finishing long side 7 of the indexable thread machining insert and is opposite to the V-shaped thread cutting edge 2, and the angle between the second protrusion 52 and the V-shaped thread cutting edge 2 is θ1, which should satisfy: 0°≤θ1≤5°, thereby effectively preventing the V-shaped chips from curling or being discharged along the unmachined surface. The angle is adjusted according to the total cutting depth of the thread. In this embodiment, θ1=4°.

[0030] In this embodiment, two ends of the second corrugated chip guiding surface 5 extend to two adjacent side surfaces 13 of the insert body 1 respectively, so as to ensure that the chips can be completely guided out from the side surfaces 13 .

[0031] In this embodiment, the angle α between the extension direction of the second corrugated chip guide surface 5 and the angular bisector of the V-thread cutting edge 2 is 90°. The chips pass through or cross the first chip guide boss 4 and collide vertically with the second corrugated chip guide surface 5, so that the chips are blocked and curled and flow out along the side of the tool.

[0032] In this embodiment, the extension direction of the first chip guide boss 4 forms an angle λ with the upper surface 11, which should satisfy: 10°≤λ≤35°, thereby guiding the chips away from the tool tip, reducing the contact time between the chips and the tool tip, preventing the tool tip temperature from being too high and affecting the life of the blade, and at the same time, guiding the chips to flow out smoothly. In this embodiment, λ=14°.

[0033] In this embodiment, the curved groove 6 is symmetrical about the angular bisector of the V-thread cutting edge 2, and the distance between the two ends and the V-thread cutting edge 2 is L1, which should satisfy: 0.05mm≤L1≤0.2mm, which not only ensures that the sharpness requirement of the tip of the tool is met, but also meets the strength requirement of the tip of the tool. In this embodiment, L1=0.1mm, and the line connecting the end points of each curved groove 6 and the V-thread cutting edge 2 has an angle β, which should satisfy: 0°≤β≤5°. As the thread cutting depth becomes deeper, the line connecting the end points of the curved groove 6 slowly extends inward with the cutting depth to leave space for the chips to be discharged smoothly and It can effectively curl and avoid extending at too large an angle, which will cause the chips to fly around because they cannot be blocked. In this embodiment, β=2°, the bottom surface of the curved groove 6 is parallel to the front cutting edge 21 and the distance between the two is H, which should satisfy: 0.05mm≤H≤0.12mm. The depth of the curved groove 6 is different according to the size of the thread specifications. Here, the curved groove 6 can effectively block the deep cutting chips of the first three knives. As the cutting becomes deeper, the curved groove 6 can only guide the chips. If the curved groove 6 is too shallow, it cannot block the chips. If it is too deep, it will form a chip extrusion nodule that affects the cutting. In this embodiment, H=0.08mm.

[0034] In this embodiment, the distance between the curved groove 6 closest to the tool tip and the tool tip is L2, h is the thread tooth height, and should satisfy: 1 / 2h≤L2≤h. During thread processing, each cutting ensures that the cutting area of ​​the chips is the same, and the cutting depth decreases step by step. In this way, when the cutting depth basically reaches 1 / 2 of the thread tooth height, the V-shaped chips are too thin to break and can be curled and discharged through the curved groove 61 closest to the tool tip to prevent the chips from flying around and scratching or entangled with the workpiece. In this embodiment, L2=0.8h.

[0035] In this embodiment, the intersections of the curved groove 6 and the first chip guiding boss 4 are all arc transitions, which facilitates smooth chip guidance.

[0036] In this embodiment, the transverse cross-section of the curved groove 6 is V-shaped or semicircular, and the depth of the curved groove 6 is S, which should satisfy: 0.02mm≤S≤0.08mm. The curved groove 6 mainly provides a curling space for the V-shaped chips and allows them to be smoothly guided out. If the depth of the curved groove 6 is too small, the chips cannot be curled. If the depth of the curved groove 6 is too large, a chip nodule is easily formed at the curved groove 6. In this embodiment, S=0.05mm.

[0037] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An indexable thread machining insert, comprising an insert body (1), the insert body (1) being surrounded by an upper surface (11), a lower surface (12) and a plurality of side surfaces (13), the insert body (1) being provided with a center hole (3) penetrating the upper surface (11) and the lower surface (12), a V-shaped thread cutting edge (2) being provided at the tip of the insert at the junction of the two side surfaces (13), the front cutting surface (21) of the V-shaped thread cutting edge (2) being formed on the upper surface (11), and characterized in that: A first chip guide boss (4) and a second wavy chip guide curved surface (5) are sequentially provided on the front cutting surface (21) along the direction from the cutting tip to the center hole (3); the first chip guide boss (4) extends along the direction from the cutting tip to the center hole (3) and is symmetrically distributed about the angular bisector of the V-shaped thread cutting edge (2); the front cutting surface (21) is also provided with a plurality of curved surface grooves (6) continuously and evenly distributed along the direction from the cutting tip to the center hole (3); each of the curved surface grooves (6) intersects with the first chip guide boss (4); a plurality of the curved surface grooves (6) extend to the second wavy chip guide curved surface (5); an extension direction of the second wavy chip guide curved surface (5) forms an angle α with the angular bisector of the V-shaped thread cutting edge (2), which satisfies the following conditions: 60°≤ α≤120°, the second corrugated chip guide surface (5) comprises at least a first protrusion (51) and a second protrusion (52), the first protrusion (51) is directly opposite to and connected to the first chip guide boss (4), the second protrusion (52) is on the same side as the polishing long side (7) of the indexable thread machining insert and is opposite to the V-shaped thread cutting edge (2), and the angle between the second protrusion (52) and the V-shaped thread cutting edge (2) is θ1, which should satisfy the following conditions: 0°≤θ1≤5°.

2. The indexable thread machining insert according to claim 1, characterized in that: Two ends of the second wave-shaped chip guiding surface (5) respectively extend to two adjacent side surfaces (13) of the blade body (1).

3. The indexable thread machining insert according to claim 1 or 2, characterized in that: The included angle α between the extension direction of the second wave-shaped chip guiding surface (5) and the angular bisector of the V-shaped thread cutting edge (2) is 90°.

4. The indexable thread machining insert according to claim 1 or 2, characterized in that: The extending direction of the first chip guide boss (4) forms an angle λ with the upper surface (11), which should satisfy the following condition: 10°≤λ≤35°.

5. The indexable thread machining insert according to claim 1 or 2, characterized in that: The curved groove (6) is symmetrical about the angular bisector of the V-shaped thread cutting edge (2), and the distance between the two ends and the V-shaped thread cutting edge (2) is L1, which should satisfy: 0.05mm≤L1≤0.2mm. The line connecting the end points of each curved groove (6) and the V-shaped thread cutting edge (2) has an angle β, which should satisfy: 0°≤β≤5°. The bottom surface of the curved groove (6) is parallel to the front cutting edge (21) and the distance between the two is H, which should satisfy: 0.05mm≤H≤0.12mm.

6. The indexable thread machining insert according to claim 5, characterized in that: The distance between the curved groove (6) closest to the tool tip and the tool tip is L2, and h is the thread tooth height, which should satisfy: 1 / 2h≤L2≤h.

7. The indexable thread machining insert according to claim 5, characterized in that: The intersection between the curved groove (6) and the first chip guide boss (4) is an arc transition.

8. The indexable thread machining insert according to claim 1 or 2, characterized in that: The transverse cross-section of the curved groove (6) is V-shaped or semicircular, and the depth of the curved groove (6) is S, which should satisfy: 0.02mm≤S≤0.08mm.

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