A cemented carbide machining blade and a tool using the same

Abstract

The present application relates to the technical fields of hard alloy processing, in particular to a blade for hard alloy processing and a cutter using the blade. The present application discloses a blade for hard alloy processing and a cutter using the blade, which comprises a blade main body in a cylindrical structure, one end of the blade main body is circumferentially formed as a cutting edge, a flat part is arranged at the center position of the end face of the blade main body corresponding to the cutting edge, a first inclined part is arranged between the edge of the flat part and the cutting edge, the first inclined part gradually inclines downward from the edge of the flat part to the cutting edge direction, and the flat part protrudes outward along the axial direction of the blade main body relative to the first inclined part. The present application has the advantages of improving the physical and mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hard alloy processing, in particular to a hard alloy processing blade and a tool using the same. BACKGROUND

[0002] A blade for hard alloy roller ribbing processing is disclosed in Chinese patent application No. 201110153980.5, which comprises a blade head and a blade body. The main blade surface of the blade head comprises a main cutting edge and two side edges symmetrically arranged with respect to the main cutting edge. The relief angle A2 of the side edge ranges from 7° to 9°. The relief surface of the main cutting edge is composed of a continuous first main relief surface, a second auxiliary relief surface and a third auxiliary relief surface. The first main relief surface, the second auxiliary relief surface and the third auxiliary relief surface have relief angles A1, B and C respectively ranging from 7° to 11°, 28° to 32° and 53° to 63°. The height K and G of the first main relief surface and the second auxiliary relief surface respectively satisfy the following relationships with the thickness H of the blade: 40%<H≤K≤58%<H and 25%<H≤G≤37%<H. The thickness H of the blade satisfies the following relationship with the cross-sectional diameter D of the blade: 60%<D≤H≤85%<D.

[0003] In the above technical solution, the cutting end of the blade is provided with a three-surface structure along the height direction of the blade, and the included angles between the three surfaces and the height direction of the blade are sequentially increased, so as to improve the physical and mechanical properties of the blade and thereby strengthen the overall strength of the blade. However, in the above technical solution, the upper end horizontal surface of the blade is used as the turning surface for turning the hard alloy workpiece. In actual processing, the reaction force of the hard alloy workpiece acts vertically on the upper surface of the blade. Since the lower end of the upper surface of the blade has no solid structure perpendicular to the upper surface of the blade, the upper surface of the blade is still prone to edge collapse during processing. Once the blade in the above technical solution collapses, the structure at the edge collapse of the turning surface of the blade is supported, so that the structure at the edge collapse of the blade is quickly consumed by the reaction force of the hard alloy workpiece, and the blade is still further damaged, which has poor use effect.

[0004] Therefore, it is still a technical problem to be solved in the prior art to improve the physical and mechanical properties of the blade by improving the physical and mechanical properties of the blade to ensure the structural strength of the blade when processing the hard alloy workpiece. SUMMARY

[0005] The present application aims to provide a hard alloy processing blade capable of changing the relative angle between the turning surface of the blade and the hard alloy workpiece to improve the physical and mechanical properties of the blade, a tool holder using the blade and a blade production equipment.

[0006] In order to achieve the above object, the application discloses a hard alloy machining blade and a cutter using the same, which comprises a blade body in a cylindrical structure, one end of the blade body is circumferentially formed as a cutting edge, a flat part is arranged at the center position of the end surface corresponding to the cutting edge of the blade body, a first inclined part is arranged between the edge of the flat part and the cutting edge, the first inclined part gradually inclines downward from the edge of the flat part to the cutting edge, and the flat part protrudes outward along the axial direction of the blade body relative to the first inclined part.

[0007] When turning or cutting the hard alloy workpiece is needed, the first inclined part of the blade body is in contact with the hard alloy workpiece, so as to turn the hard alloy workpiece, at this time, the reaction force of the hard alloy workpiece acts on the first inclined part, in the form of the component force of the reaction force of the hard alloy workpiece along the inclined surface of the first inclined part, the reaction force of the hard alloy workpiece directly acting on the blade body is reduced, and the physical and mechanical properties of the blade are improved.

[0008] The application sets the first inclined part on the blade body, so that when the blade turns the hard alloy workpiece, the reaction force of the workpiece no longer directly vertically acts on the upper surface of the blade, but is dispersed along the inclined surface of the first inclined part, the stress on the upper surface of the blade in a single direction is reduced, the physical and mechanical properties of the blade are improved, the risk of edge collapse is reduced, the overall structural strength and service life of the blade are enhanced, and the application has the advantage of improving the physical and mechanical properties.

[0009] Preferably, a second inclined part is arranged between the flat part and the first inclined part, and the included angle a2 between the second inclined part and the flat part is smaller than the included angle a1 between the first inclined part and the flat part.

[0010] The alloy chips are supported by the first inclined part, so that the alloy chips ground by the blade body are not easy to break, when the alloy chips reach the second inclined part, the alloy chips lose the support of the blade body due to the smaller inclination angle of the second inclined part than the first inclined part, so that the alloy chips are broken, and the alloy chips are easily discharged from the blade body.

[0011] Preferably, the included angle a1 between the first inclined part and the flat part and the included angle a2 between the second inclined part and the flat part increase with the increase of the hardness of the hard alloy workpiece to be machined.

[0012] The inclination of the inclined surface of the blade body is adjusted according to the workpiece to be machined under different hardness standards, when the hardness of the workpiece to be machined is higher, the inclination angle of the first inclined part and the second inclined part is larger, so that the physical and mechanical properties of the blade body and the cutting sharp angle of the blade are balanced in two directions.

[0013] As preferred, the radial width X1 between the boundary of the first inclined part and the second inclined part and the cutting edge is 0.05-0.11 mm.

[0014] The first inclined part is the area directly contacting the workpiece. If the width of this area is greater than 0.11 mm, the contact surface of the entire area will be too large, resulting in a dull knife and exacerbating the edge collapse. If the width of this area is less than 0.05 mm, the support performance will be insufficient.

[0015] As preferred, the radial width X2 between the boundary of the second inclined part and the flat part and the cutting edge is 0.09-0.19 mm.

[0016] The width X2 between the boundary of the second inclined part and the flat part and the cutting edge directly affects the width X1 between the boundary of the first inclined part and the flat part and the cutting edge. If X2 is too narrow, X1 will be too narrow. If X2 is too wide, the stability performance of the blade body and the tool holder when installed will be poor.

[0017] As preferred, the surface roughness of the first inclined part is ≤0.2 microns, and the surface roughness of the second inclined part is ≥0.4 microns.

[0018] Since the edge between the first inclined part and the circumferential surface of the blade body is the cutting edge, the cleaner the first inclined part is, the fewer defects it has under a microscope, and the less likely it is to collapse (once a defect occurs, it will quickly collapse in use). The design of the surface roughness of the second inclined part facilitates direct processing by existing grinding wheels.

[0019] A tool comprising a hard alloy machining blade also includes a tool holder, the tool holder is provided with a blade clamp, and the tool holder is provided with a blade clamping groove in one end for machining hard alloy workpieces. The clamping end of the blade clamp is opposite the top of the blade clamping groove, and the blade body can be assembled by the blade clamp after being placed in the blade clamping groove.

[0020] The blade is clamped by the blade clamp, thereby realizing the fixation of the blade during the machining of the hard alloy workpiece.

[0021] As preferred, the curvature of the side wall of the blade clamping groove is in fixed engagement with the circumferential surface of the blade body, and the included angle α3 between the bottom wall of the blade clamping groove and the horizontal surface of the upper end of the tool holder body is 2.6-3.7 degrees.

[0022] Compared with the existing hard alloy workpiece turning or cutting mode, if the position where the insert is in contact with the hard alloy workpiece exists a collapse edge, the cutting amount of the hard alloy workpiece is reduced, so that the operator can assist in identifying whether the insert produces a collapse edge through the physical contact means, and the operator can timely adjust the installation angle of the insert to protect the insert and prevent the insert from continuing to cut and use to cause greater collapse edge.

[0023] Preferably, the bottom wall of the insert clamping groove is circular, and the diameter r of the bottom wall of the insert clamping groove is smaller than the cross-sectional diameter R of the insert body.

[0024] The insert is supported by the bottom wall of the insert clamping groove, and compared with a large-volume insert support structure, the insert clamping groove can reduce the influence on the turning or cutting of the insert.

[0025] Preferably, the diameter r of the bottom wall of the insert clamping groove and the cross-sectional diameter R of the insert body satisfy the relationship 0.7R≤r≤0.8R.

[0026] If the diameter r of the bottom wall of the insert clamping groove is too small, the entire insert body cannot be supported, and if the diameter r of the bottom wall of the insert clamping groove is too large, the turning or cutting of the insert body is affected.

[0027] The present application can reduce the stress on the upper surface of the insert in a single direction, improve the physical and mechanical properties of the insert, reduce the risk of collapse edge, thereby enhancing the overall structural strength and service life of the insert, and having the advantage of improving the physical and mechanical properties of the insert. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the insert body of the present application.

[0029] Figure 2 It is a sectional structural schematic diagram of the insert body of the present application.

[0030] Figure 3 It is a structural schematic diagram of the tool holder of the present application.

[0031] Figure 4 It is a structural schematic diagram of the insert body and the tool holder of the present application after assembly.

[0032] Figure 5 It is a sectional structural schematic diagram of the tool holder of the present application.

[0033] In the figure: 11, insert body; 12, cutting edge; 21, tool holder; 22, insert clamping groove; 23, insert clamp. DETAILED DESCRIPTION

[0034] The present application will be further described below according to the drawings and specific embodiments.

[0035] Example 1

[0036] Depend on Figure 1 As shown, this embodiment discloses a cemented carbide machining insert, including a cylindrical insert body 11. The insert body 11 is a CBN insert, and one end of the insert body 11 is circumferentially formed as a cutting edge 12. The insert body 11 has a first inclined portion, a second inclined portion, and a planar portion sequentially arranged from the cutting edge 12 side towards the axis side. The first inclined portion and the second inclined portion gradually slope downwards from near the edge of the planar portion towards the cutting edge 12. Figure 2 As shown, the angle α2 between the second inclined portion and the flat portion is smaller than the angle α1 between the first inclined portion and the flat portion. The angles α1 between the first inclined portion and the flat portion and α2 between the second inclined portion and the flat portion increase with the increase of the hardness of the cemented carbide workpiece to be processed.

[0037] Table 1 below lists the relationship between the hardness of different cemented carbide workpieces to be processed and the included angle α1 between the first inclined part and the flat part, and the included angle α2 between the second inclined part and the flat part:

[0038] Table 1

[0039]

[0040] The width X1 between the boundary between the first inclined portion and the second inclined portion and the cutting edge 12 is 0.05 mm, and the width X2 between the boundary between the second inclined portion and the flat portion and the cutting edge 12 is 0.09 mm.

[0041] The surface roughness of the first inclined part is ≤0.2 micrometers, and the surface roughness of the second inclined part is ≥0.4 micrometers.

[0042] Depend on Figure 3 , Figure 4 As shown, a tool including a carbide cutting insert also includes a tool holder 21. The tool holder 21 is provided with a cutting insert clamp 23. A cutting insert groove 22 is opened in the end of the tool holder 21 used for machining carbide workpieces. The clamping end of the cutting insert clamp 23 is directly above the cutting insert groove 22. The bottom wall of the cutting insert groove 22 is circular. After the cutting insert body 11 is placed in the cutting insert groove 22, it can be assembled by the cutting insert clamp 23. The relationship between the diameter r of the bottom wall of the cutting insert groove 22 and the cross-sectional diameter R of the cutting insert body 11 is 0.7R≤r≤0.8R.

[0043] Depend on Figure 5 As shown, the curvature of the side wall of the blade clamping groove 22 is fixedly matched with the circumferential surface of the blade body 11, and the angle α3 between the bottom wall of the blade clamping groove 22 and the upper horizontal plane of the blade holder 21 body is 3.5 degrees.

[0044] When the turning or cutting of the cemented carbide workpiece is needed, the blade body 11 is installed in the blade clamping groove 22 and fixed by the blade clamp 23, the fixing mode between the blade clamp 23 and the blade body 11 is the same as the prior art, at this time, the edge of the first inclined part of the blade body 11 and the circumferential surface of the blade body 11 serves as the blade edge 12 in contact with the cemented carbide workpiece, so as to turn or cut the cemented carbide workpiece, the reaction force of the workpiece acts on the first inclined part, the inclined surface of the first inclined part generates a component force along the inclined surface, thereby reducing the reaction force of the cemented carbide workpiece directly acting on the blade body 11, thereby prolonging the required processing cycle of the blade body 11 to generate edge collapse, and further improving the overall structural strength and service life of the blade body 11.

[0045] When the blade body 11 inevitably produces edge collapse after a long time of turning or cutting, the blade body 11 is in slight contact with the cemented carbide workpiece due to the inclination angle of the bottom wall of the blade clamping groove 22, which affects the grinding amount of the roller ring during feeding, thereby assisting the operator to distinguish whether the blade produces edge collapse through physical contact, so that the operator can timely adjust the installation angle of the blade to protect the blade and prevent the blade from continuing to turn and use to cause greater edge collapse.

[0046] In the table 2 below, the processing quantity of the blade body 11 with a planar upper end surface and the blade body 11 after being processed by the present scheme is listed:

[0047] Table 2

[0048] .

[0049] The hardness range of the roller ring is HRA82-82.8, the outer diameter of the roller ring is 214mm, the inner hole diameter is 118mm, and the height is 74mm, and the roller ring is roughly turned to a roller ring with an outer diameter of 212.8mm, an inner hole diameter of 119.2mm, and a height of 72.8mm, which is recorded as one round of processing.

[0050] Example Two

[0051] The difference between the present example and example one is that the width X1 between the first inclined part and the second inclined part and the blade edge 12 is 0.11mm, and the width X2 between the second inclined part and the planar part and the blade edge 12 is 0.09mm.

[0052] In the table 3 below, the processing quantity of the blade body 11 with a planar upper end surface and the blade body 11 after being processed by the present scheme is listed:

[0053] Table 3

[0054]

[0055] The hardness range of the roller ring is HRA 82-82.8, the outer diameter of the roller ring is 214 mm, the inner hole diameter is 118 mm, and the height is 74 mm. The roller ring is roughly processed to a roller ring with an outer diameter of 212.8 mm, an inner hole diameter of 119.2 mm, and a height of 72.8 mm, which is recorded as one round of processing.

[0056] Example Three

[0057] The difference between this embodiment and Example One is that the width X1 between the boundary of the first inclined portion and the second inclined portion and the blade edge 12 is 0.08 mm, and the width X2 between the boundary of the second inclined portion and the flat portion and the blade edge 12 is 0.09 mm.

[0058] In Table 4 below, the number of processed pieces of the blade body 11 with a flat upper end surface and the blade body 11 processed according to the present solution is listed:

[0059] Table 4

[0060]

[0061] The hardness range of the roller ring is HRA 82-82.8, the outer diameter of the roller ring is 214 mm, the inner hole diameter is 118 mm, and the height is 74 mm. The roller ring is roughly processed to a roller ring with an outer diameter of 212.8 mm, an inner hole diameter of 119.2 mm, and a height of 72.8 mm, which is recorded as one round of processing.

Claims

1. A hard metal machining insert comprising a cylindrical insert body, one end of which is circumferentially configured as a cutting edge, characterized in that: The blade body is provided with a flat portion corresponding to the center position of the end face of the cutting edge, the edge of the flat portion and the cutting edge are provided with a first inclined portion, the first inclined portion gradually inclines downward in the direction of the cutting edge near the edge of the flat portion; a second inclined portion is provided between the flat portion and the first inclined portion, the included angle α2 between the second inclined portion and the flat portion is smaller than the included angle α1 between the first inclined portion and the flat portion; the included angle α1 between the first inclined portion and the flat portion and the included angle α2 between the second inclined portion and the flat portion increase with the increase of the hardness of the hard alloy workpiece to be machined; the width X1 between the boundary of the first inclined portion and the second inclined portion and the cutting edge is 0.05-0.11mm; the width X2 between the boundary of the second inclined portion and the flat portion and the cutting edge is 0.09-0.19mm.

2. A hard metal machining insert according to claim 1, characterized in that: The surface roughness of the first inclined portion is ≤0.2 microns, and the surface roughness of the second inclined portion is ≥0.4 microns.

3. A tool comprising a cutting insert according to any one of claims 1-2, characterized in that: Also includes a tool holder, the tool holder is provided with a blade clamp, the tool holder is used for machining hard alloy workpiece one end is opened with blade clamp slot, the blade clamp clamping end is right for the above of the blade clamp slot.

4. A tool as claimed in claim 3, characterised in that: The arc of the side wall of the blade clamp slot is fixedly matched with the circumferential surface of the blade body, and the included angle α3 between the bottom wall of the blade clamp slot and the horizontal surface of the upper end of the tool holder body is 2.6-3.7 degrees.

5. A tool as claimed in claim 4, characterised in that: The bottom wall of the blade clamp slot is circular, and the diameter r of the bottom wall of the blade clamp slot is smaller than the cross-sectional diameter R of the blade body.

6. A tool as claimed in claim 5, characterised in that: The relationship between the diameter r of the bottom wall of the blade clamp slot and the cross-sectional diameter R of the blade body is 0.7R≤r≤0.8R.

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