Heavy-load turning blade
By designing the corrugated edge curves of the polygonal insert base, angle cutting edge, secondary cutting edge and main cutting edge in the turning insert, combining the angular chip breaker and friction reduction groove, the heat transfer and chip cutting of the turning insert in heavy cutting is solved. The problem of large curling radius achieves higher cutting strength, adaptability and service life.
Patent Information
- Application Number
- CN202421277665.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-06-06
AI Technical Summary
When the chips flow out during heavy cutting, heat is transferred to the insert substrate, reducing service life. The large radius of chip curling leads to an increase in the main cutting force, affecting cutting efficiency and limited adaptability.
A polygonal insert base is designed, including round holes, angle cutting edges, secondary cutting edges and main cutting edges. The main cutting edge forms a corrugated edge curve through the wide section of the change edge, combining the angular chip breaker and friction reduction grooves to reduce the Small chip curl radius and heat transfer.
It improves the cutting strength and adaptability of the turning insert, reduces the main cutting force, extends the service life of the insert substrate, and improves the cutting efficiency.
Smart Images
Figure CN222511340U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cemented carbide blades, in particular to a heavy-load turning blade. Background Art
[0002] There are many types of turning inserts on the market. However, when performing heavy cutting, most of the cutting heat is brought out by the chips. When the chips flow out, they contact the upper surface and transfer the heat to the blade base, thereby reducing the service life of the blade base. Moreover, when the chips flow out, the curling radius is large and they cannot be curled and broken in time, resulting in the friction between the chips and the upper surface, which increases the main cutting force and affects the cutting efficiency. Furthermore, the existing turning inserts have a constant main cutting edge width, which makes the turning inserts very limited in the occasions they can be used for. Due to the shortcomings of turning inserts in cutting efficiency, service life, adaptability, etc., it is difficult to meet the market demand for heavy cutting operations. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a heavy-duty turning insert.
[0004] The technical solution of the utility model is: it includes a polygonal blade base, a circular hole is provided at the geometric center of the blade base, a cutting unit is provided at the top corner of the blade base, the cutting unit includes an angle cutting edge and a secondary cutting edge, the angle cutting edge is a chamfered structure, the secondary cutting edge is a straight line, continuous main cutting edges are provided between the secondary cutting edges, a first variable blade width section is provided at the intersection of the secondary cutting edge and the main cutting edge along the extension direction of the main cutting edge, and the blade width on the first variable blade width section is gradually increased through a transition arc surface.
[0005] Its further technical solution is:
[0006] The first variable blade width section is also provided with a second variable blade width section along the extension direction of the main cutting edge. The blade width on the second variable blade width section is gradually reduced through the transition arc surface. The tangent connection between the first variable blade width section and the second variable blade width section forms a waveform, and the main cutting edge is a waveform blade curve formed by connecting multiple waveforms.
[0007] Its further technical solution is:
[0008] The corner cutting edge and the secondary cutting edge extend toward the circular hole to form a front face of the corner cutting edge, and an angular chip breaker groove is arranged on the front face of the corner cutting edge.
[0009] Its further technical solution is:
[0010] The angular chip breaker groove is formed by a depression in the front of the angular cutting edge that is inclined toward the circular hole and is surrounded by a circular arc protrusion at the depression.
[0011] Its further technical solution is:
[0012] The upper top surface is provided with a friction reducing groove, which is an inclined groove formed by a downward depression at a position of the upper top surface close to the main cutting edge, and the cross section of the inclined groove is in an arc shape.
[0013] Its further technical solution is:
[0014] The anti-friction groove is provided with a long strip of convex strips, the convex strips extend along the direction of chip discharge of the blade, and a plurality of groups of convex strips are arranged in parallel and evenly in the inclined groove.
[0015] Its further technical solution is:
[0016] Each wave crest of the wave edge curve corresponds to a group of convex strips.
[0017] Its further technical solution is:
[0018] The corner cutting edge is tangentially connected to the minor cutting edge.
[0019] Its further technical solution is:
[0020] The front angle γ0 of the angular chip breaker is 13°~15°.
[0021] The beneficial technical effects of the utility model are:
[0022] Through the structural design of the angular cutting edge and the secondary cutting edge, the turning insert has sharpness. Through the variable width design of the main cutting edge, the main cutting edge can ensure the cutting strength of the turning insert while controlling the cutting resistance during cutting. It can be flexibly switched under different cutting depths and has good market adaptability. By arranging angular chip breaker grooves and friction reduction grooves in front of the angular cutting edge and on the upper top surface close to the main cutting edge, the curling radius of the outflowing chips is reduced, and the chips can be broken and discharged in time, thereby reducing the main cutting force and improving the cutting efficiency. By arranging arc protrusions and convex strips on both the angular chip breaker grooves and the friction reduction grooves, the heat transferred from the chips to the insert base is reduced, thereby improving the service life of the turning insert. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0024] Figure 2 This utility model Figure 1 Schematic diagram of local structure;
[0025] Figure 3 It is a schematic cross-sectional view of the front side of the utility model along the AA direction;
[0026] Figure 4 This is a specific schematic diagram of the angular chip breaker of the utility model;
[0027] 1. Blade base; 2. Circular hole; 3. Upper top surface; 4. Lower bottom surface; 5. Flank surface; 6. Side surface; 7. Angular cutting edge; 8. Secondary cutting edge; 9. Front of angular cutting edge; 10. Angular chip breaker groove; 11. Arc protrusion; 12. Back of angular cutting edge; 13. Main cutting edge; 131. First variable blade width section; 132. Second variable blade width section; 14. Friction reduction groove; 15. Raised strip. DETAILED DESCRIPTION
[0028] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.
[0029] like Figure 1 As shown, the utility model provides a heavy-duty turning insert, comprising a insert base 1 with a circular hole 2 at the geometric center, wherein the circular hole 2 is a vertical through hole, and the insert base 1 is surrounded by an upper top surface 3, a lower bottom surface 4, two groups of back cutting surfaces 5 connected to the upper top surface 3 and the lower bottom surface 4, and two groups of side surfaces 6. The shape of the insert base 1 has four side edges when viewed from above.
[0030] Cutting units are provided at the four vertex corners where the two side edges intersect, and the cutting units include a corner cutting edge 7 and a secondary cutting edge 8. The corner cutting edge 7 is a chamfered structure, which enhances the strength of the corner cutting edge 7 and greatly improves the impact resistance of the blade base 1; the secondary cutting edge 8 is straight.
[0031] The corner cutting edge 7 and the secondary cutting edge 8 extend toward the circular hole 2 to form a corner cutting edge front face 9, on which an angular chip breaker groove 10 is provided. The angular chip breaker groove 10 is formed by the corner cutting edge front face 9 being inclined and recessed toward the circular hole and surrounded by a circular arc protrusion 11 at the recess. The cross section of the angular chip breaker groove 10 is a straight arc shape, and between the lower bottom surface 4 and the corner cutting edge 7 is a continuous corner cutting edge rear face 12.
[0032] Furthermore, the corner cutting edge 7 is located on a quarter arc, and the corner cutting edge 7 is tangentially connected to the secondary cutting edge 8 .
[0033] like Figure 2As shown, there is a continuous main cutting edge 13 between the secondary cutting edges 8, and the main cutting edge 13 bears a large cutting force and cutting heat during cutting. In order to enhance the strength of the tool, a first variable blade width section 131 is provided at the intersection of the secondary cutting edge 8 and the main cutting edge 13 along the extension direction of the main cutting edge 13, and the blade width on the first variable blade width section 131 is gradually increased through a transition arc surface; this structure enables the blade base 1 to retain the sharpness of the blade at a small cutting depth, and at a large cutting depth, the blade can be given sufficient cutting strength due to the gradual increase in blade width to avoid the risk of chipping.
[0034] Furthermore, the first variable blade width section 131 is also provided with a second variable blade width section 132 along the extension direction of the main cutting edge 13, and the blade width of the second variable blade width section 132 is gradually reduced through the transition arc surface to reduce the cutting resistance. The first variable blade width section 131 and the second variable blade width section 132 are connected to form a waveform, and the main cutting edge 13 is formed by a plurality of the waveforms connected through transition. This structure not only guarantees the cutting strength of the main cutting edge 13 to a certain extent, but also takes into account the control of the cutting resistance of the main cutting edge 13 within a certain range. The variable blade width structure enables the turning insert to adapt to more occasions and has good adaptability.
[0035] The flank surface 5 is located between the main cutting edge 13 and the lower bottom surface 4 and is continuously formed between the rear surfaces 12 of the corner cutting edges.
[0036] Furthermore, the upper top surface 3 is provided with a friction reduction groove 14 and a convex strip 15. The friction reduction groove 14 is a bevel groove formed by each of the upper top surface 3 being concave downward near the four side positions, and the cross section of the bevel groove is arc-shaped. The friction reduction groove 14 is designed to make the chips easy to flow out, curl and break, so as to reduce the friction between the chips and the upper top surface 3, thereby reducing the main cutting force. The convex strip 15 is a long strip heat dissipation strip, and the convex strip 15 extends along the direction of the blade chip discharge. Multiple groups of convex strips are arranged in parallel and evenly in the bevel groove, and a chip discharge groove is formed between the convex strips 15.
[0037] The convex strips 15 can reduce the contact area between the upper top surface 3 and the metal workpiece during cutting, thereby reducing the heat generated by the friction between the upper top surface 3 and the metal workpiece; at the same time, the contact area between the chips and the upper top surface 3 is reduced, thereby greatly reducing the heat transferred from the chips to the blade base 1, and improving the service life of the blade base 1. The chips are discharged from the chip discharge groove in time, thereby improving the cutting efficiency.
[0038] The main cutting edge 13 forms a wavy edge curve, and each crest of the wavy edge curve corresponds to a group of ridges 15. The concave and convex parts formed between the multiple groups of chip grooves and the multiple groups of ridges 15 are repeatedly circulated to form a blade shape that can cut off the chips. By cutting off the chips, the effect of suppressing cutting resistance can be produced.
[0039] In this embodiment, Figure 3 to Figure 4 The negative chamfer width b of the angular chip breaker groove 10 is set to 0.40mm~0.45mm, and the negative chamfer front angle γ1 is 5°~6°. The larger the front angle γ0 of the angular chip breaker groove 10, the greater the chip deformation, the smaller the curling radius, and the easier the chips are to break. In this embodiment, the front angle γ0 of the angular chip breaker groove 10 is 13°~15°. If the normal groove width W of the angular chip breaker groove 10 is too large, the chips are not easy to break, and if it is too small, it is easy to cause chip blockage. In this embodiment, the normal groove width W of the angular chip breaker groove 10 is 4.20mm~4.30mm.
[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.
Claims
1. A heavy-duty turning insert, comprising a polygonal insert base (1), wherein a circular hole (2) is provided at the geometric center of the insert base (1), characterized in that: A cutting unit is provided at a top corner of a blade base (1), wherein the cutting unit comprises an angle cutting edge (7) and a secondary cutting edge (8), wherein the angle cutting edge (7) is of a rounded structure, and the secondary cutting edge (8) is of a straight line shape, and a continuous main cutting edge (13) is provided between the secondary cutting edges (8), and a first variable blade width section (131) is provided at the intersection of the secondary cutting edge (8) and the main cutting edge (13) along the extension direction of the main cutting edge (13), and the blade width on the first variable blade width section (131) is gradually increased through a transition arc surface.
2. A heavy-duty turning insert according to claim 1, characterized in that: The first variable blade width section (131) is also provided with a second variable blade width section (132) along the extension direction of the main cutting edge (13); the blade width of the second variable blade width section (132) is gradually reduced through a transition arc surface; the first variable blade width section (131) and the second variable blade width section (132) are tangentially connected to form a waveform; and the main cutting edge (13) is a waveform edge curve formed by connecting a plurality of the waveforms.
3. A heavy-duty turning insert according to claim 1, characterized in that: The corner cutting edge (7) and the secondary cutting edge (8) extend toward the circular hole (2) to form a corner cutting edge front face (9), and an angular chip breaker groove (10) is provided on the corner cutting edge front face (9).
4. A heavy-duty turning insert according to claim 3, characterized in that: The angular chip breaker groove (10) is formed by the front face of the angular cutting edge (9) being inclined and depressed in the direction of the circular hole (2) and being surrounded by a circular arc protrusion (11) at the depression.
5. A heavy-duty turning insert according to claim 2, characterized in that: The upper top surface (3) is provided with a friction reducing groove (14), which is an inclined groove formed by a downward depression at a position of the upper top surface (3) close to the main cutting edge (13), and the cross section of the inclined groove is in the shape of an arc.
6. A heavy-duty turning insert according to claim 5, characterized in that: The friction reducing groove (14) is provided with a long strip convex strip (15), the convex strip (15) extends along the direction of chip discharge of the blade, and a plurality of groups of convex strips (15) are arranged in parallel and evenly in the inclined groove.
7. A heavy-duty turning insert according to claim 6, characterized in that: Each wave crest of the wave edge curve corresponds to a group of convex strips (15).
8. The heavy-duty turning insert according to claim 1, characterized in that: The corner cutting edge (7) is tangentially connected to the secondary cutting edge (8).
9. The heavy-duty turning insert according to claim 3, characterized in that: The front angle γ0 of the angular chip breaker groove (10) is 13° to 15°.