Diamond compact for cutting pick protection body

Abstract

A diamond compact for a cutting tooth protection body comprises a hard alloy substrate and a special-shaped polycrystalline layer which are integrally formed, a middle convex ridge is arranged in the middle of the special-shaped polycrystalline layer in the diameter direction, two side wing slopes are symmetrically arranged on the two sides of the middle convex ridge, and two end convex ridges are symmetrically arranged at the two ends of the middle convex ridge. The end protruding ridges are arranged in a downward inclined mode and located on the same vertical plane with the middle protruding ridge, the cross section size of the end protruding ridges is the same as that of the middle protruding ridge, two end wing inclined faces are symmetrically arranged on the two sides of the end protruding ridges, and the end wing inclined faces and the side wing inclined faces are mutually connected and in smooth transition. The side wing inclined plane and the middle convex ridge in the middle of the special-shaped polycrystalline layer can be matched with a rock abrasion track, and the convex ridge and the end wing inclined plane at the end can form cutting force and generate a slag guiding effect, so that the protection body composite sheet has auxiliary cutting and track guiding functions, the impact force can be effectively reduced in a complex rock stratum, and the protection body service life of the composite sheet is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of diamond compact, especially to a diamond polycrystal compact for tooth guard. BACKGROUND

[0002] In engineering rotary digging and tunneling, using diamond composite tooth has many advantages compared with traditional tooth, such as higher wear resistance, longer service life, higher operation efficiency and lower environmental pollution, etc. The overall service life of diamond composite tooth is more than 6 times higher than that of traditional tooth, and the operation efficiency is more than 50% higher.

[0003] The side of some diamond composite tooth is provided with a protective compact, which is composed of a polycrystalline diamond layer and a cemented carbide substrate. The polycrystalline diamond layer is the working layer, which has high hardness, high wear resistance, high thermal conductivity and other characteristics, and can effectively cut and crush rock and other materials. The cemented carbide substrate provides support for the polycrystalline diamond layer and gives the compact good strength and impact toughness, playing a good protective role. However, such compact is usually a regular cylindrical structure, which cannot match the rock wear track during rotary digging or tunneling, and is subjected to a large impact force during operation in complex rock layers, causing the protective compact to easily fall off and have a low service life, which needs to be improved. SUMMARY

[0004] To solve the above problems, the utility model provides a diamond compact for tooth guard.

[0005] The technical scheme of the utility model is: a diamond compact for tooth guard, which comprises an integrally formed cemented carbide substrate and a special-shaped polycrystalline layer, both of which are sintered under ultra-high pressure and high temperature conditions. The special-shaped polycrystalline layer has a middle ridge along the diameter direction in the middle, a certain spacing is provided between the two ends of the middle ridge and the outer side surface of the special-shaped polycrystalline layer, the sizes of the two ends forming the spacing are the same, two side wing inclined surfaces are symmetrically provided on the two sides of the middle ridge, the lower end of the side wing inclined surface extends to the outer side surface of the special-shaped polycrystalline layer, two end part ridges are symmetrically provided at the two ends of the middle ridge, the lower end of the end part ridge extends to the outer side surface of the special-shaped polycrystalline layer, the end part ridge is arranged downwardly inclined and located in the same vertical plane as the middle ridge, the cross-sectional size of the end part ridge is the same as that of the middle ridge, the length of the middle ridge is greater than that of the end part ridge, two end wing inclined surfaces are symmetrically provided on the two sides of the end part ridge, the end wing inclined surface and the side wing inclined surface are connected to each other and smoothly transitioned, avoiding obvious ridges at the joint of the two.

[0006] Preferably, the two sides of the side wing inclined surface are provided with arc-shaped recessed parts, the inner middle part of the end wing inclined surface is provided with an arc-shaped protruding part, the arc-shaped protruding part is matched and connected to the arc-shaped recessed part, and a structure of mutual embedding is formed between the arc-shaped protruding part and the arc-shaped recessed part.

[0007] Preferably, the included angle between the two end wing slopes is α, 10°≤α≤170°.

[0008] Preferably, the end wing slope is an arc surface, and the radius of the arc surface is R1, R1 ≥20mm.

[0009] Preferably, the side wing slope is an arc surface, and the diameter of the arc surface is R2, R2 ≥20mm.

[0010] Preferably, the middle ridge is an arc ridge, and the radius of the middle ridge is R3, R3 ≥2mm.

[0011] Preferably, the overall thickness of the composite sheet is a, a ≥2mm, and the overall thickness of the special-shaped polycrystal layer is b, b ≥1.5mm.

[0012] Preferably, the edge portion of the special-shaped polycrystal layer is provided with a round corner, and the radius of the round corner is R4, 0.2mm≤R4≤1mm.

[0013] The beneficial technical effects of the utility model are that: the special-shaped polycrystal layer is designed on the composite sheet, the side wing slope and the middle ridge in the middle of the special-shaped polycrystal layer can be matched with the rock abrasion track, the ridge and the end wing slope at the end can form a cutting force and produce a slag guiding effect, so that the protective composite sheet has the functions of auxiliary cutting and track guiding, and can effectively reduce the impact force in complex rock strata and improve the service life of the composite sheet. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0015] Figure 2 is the front view structure schematic diagram of the utility model;

[0016] Figure 3 is the side view structure schematic diagram of the utility model;

[0017] Figure 4 is Figure 3 the A-A direction sectional view structure schematic diagram of the utility model;

[0018] Figure 5 is Figure 3 the B-B direction sectional view structure schematic diagram of the utility model.

[0019] In the drawing, 1. hard alloy base sheet, 2. special-shaped polycrystal layer, 21. middle ridge, 22. side wing slope, 23. end ridge, 24. end wing slope, 25. arc concave portion, 26. arc convex portion, 27. round corner. DETAILED DESCRIPTION

[0020] Example one, referring to the attached Figures 1-5The application discloses a diamond compact for a cutting tooth protector, which comprises an integrally-formed hard alloy substrate 1 and a special-shaped polycrystal layer 2, wherein the special-shaped polycrystal layer is provided with a middle ridge 21 in the middle thereof along the diameter direction, two side wing inclined surfaces 22 are symmetrically arranged on both sides of the middle ridge, the coverage area of the side wing inclined surface 22 on the special-shaped polycrystal layer 2 is greater than that of an end wing inclined surface 24, two end ridges 23 are symmetrically arranged at the two ends of the middle ridge 21, the end ridges 23 are arranged in a downward inclination and are located in the same vertical plane as the middle ridge 21, so that the end ridges 23 and the middle ridge 21 can be in the same cutting path, the cross-sectional dimension of the end ridge 23 is the same as that of the middle ridge 21, the cutting resistance of the end ridge 23 and the middle ridge 21 is kept as much as possible, and the end wing inclined surface 24 and the side wing inclined surface 22 are connected to each other and are smoothly transitioned.

[0021] The two sides of the side wing inclined surface 22 are provided with arc-shaped recesses 25, the inner side of the middle part of the end wing inclined surface 24 is provided with arc-shaped protrusions 26, the arc-shaped protrusions 26 are matched and connected to the arc-shaped recesses 25, and the mutually embedded structure of the arc-shaped recesses 25 and the arc-shaped protrusions 26 can improve the overall cutting support strength of the side wing inclined surface 22 and the end wing inclined surface 24.

[0022] The included angle between the two end wing inclined surfaces 24 is alpha (10°<=alpha<=170°), the included angle makes the cutting force of the compact for the protector be relatively strong, the size of the cutting force can be changed by adjusting the included angle, and the cutting operation of various rocks can be adapted.

[0023] The end wing inclined surface 24 is an arc surface, the radius of the arc surface is R1 (R1>=20mm), the arc surface of the side wing inclined surface 22 has a diameter of R2 (R2>=20mm), and the arc surfaces of the end wing inclined surface 24 and the side wing inclined surface 22 are arranged to make the stress in the cutting process be relatively uniform, the wear be relatively uniform, the wear resistance be enhanced, and the space formed between the arc surface and rocks be beneficial to the discharge of cutting chips and the improvement of the chip removal effect.

[0024] The middle ridge 21 is an arc ridge, the radius of the middle ridge 21 is R3 (R3>=2mm), and the arc shape of the middle ridge 21 makes the stress in the cutting process be relatively uniform and the wear resistance be enhanced.

[0025] The overall thickness of the compact is a (a>=2mm), and the overall thickness of the special-shaped polycrystal layer 2 is b (b>=1.5mm), the thickness range of the compact and the thickness range of the special-shaped polycrystal layer 2 are arranged to save the special-shaped polycrystal layer 2 as much as possible under the premise of ensuring the cutting strength of the special-shaped polycrystal layer 2.

[0026] The edge part of the special-shaped polycrystal layer 2 is provided with a round corner 27, the radius of the round corner 27 is R4 (0.2mm<=R4<=1mm), and the roundness of the edge part of the special-shaped polycrystal layer 2 is improved through the round corner 27.

[0027] The special shaped polycrystal layer 2 is designed on the composite segment of the embodiment, the side wing inclined surface 22 and the middle convex ridge 21 in the middle part of the shaped polycrystal layer 2 can be matched with the rock abrasion track, the convex ridge and the end wing inclined surface 24 at the end part can form the cutting force and produce the slag guiding effect, so that the body composite segment has the auxiliary cutting and track guiding functions, and can effectively reduce the impact force in the complex rock stratum and improve the body life of the composite segment.

Claims

1. A diamond compact for a cutting pick, characterized by: The hard alloy base sheet and the special-shaped polycrystal layer are integrally formed, the middle part of the special-shaped polycrystal layer is provided with a middle ridge in the diameter direction, two side wing slopes are symmetrically arranged on both sides of the middle ridge, two end ridges are symmetrically arranged at both ends of the middle ridge, the end ridges are arranged in a downward inclined manner and are located in the same vertical plane as the middle ridge, the cross-sectional dimension of the end ridges is the same as that of the middle ridge, and two end wing slopes are symmetrically arranged on both sides of the end ridges, the end wing slopes and the side wing slopes are connected to each other and smoothly transitioned.

2. The diamond compact for a cutting pick body according to claim 1, characterized in that: Arc-shaped recesses are arranged on both sides of the side wing slopes, and arc-shaped protrusions are arranged on the inner middle part of the end wing slopes, the arc-shaped protrusions are matched and connected to the arc-shaped recesses.

3. The diamond compact for a cutting pick body according to claim 1, characterized in that: The included angle between the two end wing slopes is alpha, and 10°≤ alpha ≤ 170°.

4. The diamond compact for a cutting pick body according to claim 3, characterized in that: The end wing slope is an arc surface, the radius of the arc surface is R1, and R1 ≥ 20 mm.

5. The diamond compact for a cutting pick body according to claim 1, characterized in that: The arc surface of the side wing slope, the diameter of the arc surface is R2, and R2 ≥ 20 mm.

6. The diamond compact for a cutting pick body according to claim 1, characterized in that: The middle ridge is an arc-shaped ridge, the radius of the middle ridge is R3, and R3 ≥ 2 mm.

7. The diamond compact for a cutting pick body according to claim 1, characterized in that: The overall thickness of the composite sheet is a, a ≥ 2 mm, and the overall thickness of the special-shaped polycrystal layer is b, b ≥ 1.5 mm.

8. The diamond compact for a cutting pick body according to claim 1, characterized in that: The edge part of the special-shaped polycrystal layer is provided with a round corner, the radius of the round corner is R4, and 0.2 mm ≤ R4 ≤ 1 mm.

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