Novel diamond composite cutting pick

Abstract

A novel diamond composite cutting tooth comprises a cutting tooth base body and a diamond tooth tip, a main body of the diamond tooth tip is a hard alloy conical base body, a diamond polycrystalline layer is arranged on the side face of the conical tip of the conical base body, a circular truncated cone part is arranged at the tip end of the cutting tooth base body, a groove is formed in the center of the end face of the circular truncated cone part, and the diamond tooth tip is embedded in the groove. The polycrystalline diamond layer is located outside the groove, a plurality of protection body grooves are evenly distributed in the side face of the circular truncated cone part, and protection body composite sheets are installed in the protection body grooves; the diamond tooth top of the composite cutting tooth is fixed in the groove of the cutting tooth base body in an embedded mode, thermal damage to the diamond tooth top caused by traditional brazing is avoided, the mechanical property of the diamond tooth top is improved, the diamond tooth top is of a composite structure formed by combining the hard alloy conical base body and the diamond polycrystalline layer, and the service life of the composite cutting tooth is prolonged. The diamond composite cutting pick has high wear resistance of diamond and excellent impact toughness of hard alloy, the probability of impact failure of a diamond tip is reduced, the advantage of high wear resistance of polycrystalline diamond is exerted, and the service life of the diamond composite cutting pick is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of diamond composite cutting tooth, especially to a new diamond composite cutting tooth. BACKGROUND

[0002] The diamond composite cutting tooth is a kind of cutting tooth type combined with multiple materials or structural design, mainly used in mine machinery (such as heading machine, coal winning machine), tunnel engineering equipment (such as shield machine) and other scenes to improve wear resistance, impact resistance and service life.

[0003] At present, the side of part diamond composite cutting tooth can be provided with multiple hard alloy beans, laser cladding ceramic wear-resistant coating and different protective measures, but in terms of wear resistance, hard alloy beans and laser cladding wear-resistant coating are far from diamond polycrystalline compact (hereinafter referred to as "composite sheet"), so the tooth body of the present application is designed to adopt composite sheet protection, and the protection effect is achieved by the good strength and impact toughness of the composite sheet. However, such composite sheet is usually a regular cylindrical structure, and cannot match the rock wear track during rotary digging or tunneling process, and the impact force is larger during complex rock stratum operation, which causes the protective composite sheet to easily fall off and has low service life. And the conventional hard alloy cutting tooth tip will accelerate wear when facing complex stratum operation, which leads to cutting tooth failure, and the hard alloy tooth tip is seriously worn out, which is related to the insufficient wear resistance of the hard alloy tooth tip, and needs to be improved. SUMMARY

[0004] In order to solve the above problems, the utility model provides a new diamond composite cutting tooth.

[0005] The technical scheme of the utility model is: a new diamond composite cutting tooth, cutting tooth base body and diamond tooth tip, the main body of diamond tooth tip is hard alloy conical base body, the middle part of conical base body is provided with a circular seat, the center of circular seat is coaxially provided with an assembly column, the taper side of conical base body is provided with a diamond polycrystalline layer, the diamond polycrystalline layer has a certain thickness, the tip of cutting tooth base body is provided with a circular truncated cone part, the end face center of circular truncated cone part is provided with a groove, the upper end port outside of groove is provided with a round corner, diamond tooth tip is embedded in the groove, diamond polycrystalline layer is located outside the groove, the side surface of circular truncated cone part is uniformly provided with a plurality of protective body grooves, protective body composite sheet is installed in protective body groove, and protective body composite sheet basically covers the outer side surface of circular truncated cone part.

[0006] Preferably, the body composite sheet comprises a hard alloy base sheet and a special-shaped polycrystal layer which are integrally formed and sintered under super-high pressure and high temperature, the special-shaped polycrystal layer is provided with a middle ridge along the diameter direction, a certain spacing is provided between the two ends of the middle ridge and the outer side surface of the special-shaped polycrystal layer, the two ends have the same size, two side wing inclined surfaces are symmetrically arranged on the two sides of the middle ridge, two end ridge portions are symmetrically arranged on the two ends of the middle ridge, the lower end of the end ridge portion extends to the outer side surface of the special-shaped polycrystal layer, the end ridge portion is arranged downwardly and is located in the same vertical plane as the middle ridge, the cross-sectional size of the end ridge portion is the same as that of the middle ridge, the length of the middle ridge is greater than that of the end ridge portion, two end wing inclined surfaces are symmetrically arranged on the two sides of the end ridge portion, the end wing inclined surface and the side wing inclined surface are connected to each other and smoothly transitioned, and obvious ridges are avoided at the joint of the two.

[0007] Preferably, the length direction of the middle ridge is consistent with the axial direction of the cutting tooth base.

[0008] Preferably, the two sides of the side wing inclined surface are provided with arc-shaped recessed portions, the inner middle portion of the end wing inclined surface is provided with an arc-shaped protruding portion, the arc-shaped protruding portion is matched and connected to the arc-shaped recessed portion, and a structure of mutual embedding is formed between the arc-shaped protruding portion and the arc-shaped recessed portion.

[0009] Preferably, the included angle between the two end wing inclined surfaces is α, and 10°≤α≤170°.

[0010] Preferably, the end wing inclined surface is an arc surface, the radius of the arc surface is R1, and R1 ≥20mm.

[0011] Preferably, the arc surface of the side wing inclined surface has a diameter R2, and R2 ≥20mm.

[0012] Preferably, the middle ridge is an arc-shaped ridge, the radius of the middle ridge is R3, and R3 ≥2mm.

[0013] Preferably, the overall thickness of the composite sheet is a, a ≥2mm, the overall thickness of the special-shaped polycrystal layer is b, and b ≥1.5mm.

[0014] Preferably, the edge portion of the special-shaped polycrystal layer is provided with a round corner, the radius of the round corner is R4, and 0.2mm≤R4≤1mm.

[0015] The beneficial technical effects of the utility model are as follows:

[0016] (1) The diamond tooth tip of the utility model is fixed in the groove of the tooth base body in the way of inlaying, avoids the thermal damage of traditional brazing to the diamond tooth tip, improves the mechanical properties of the diamond tooth tip, and the diamond tooth tip adopts the composite structure of the hard alloy conical base body and the diamond polycrystal layer, has the high wear resistance of diamond and the excellent impact toughness of hard alloy, is beneficial to reducing the probability of impact failure of the diamond tooth tip, plays the advantages of high wear resistance of the diamond polycrystal layer, and improves the service life of the diamond composite tooth.

[0017] (2) The special-shaped polycrystal layer is designed on the body composite sheet, the side wing inclined surface and the middle ridge in the middle part of the special-shaped polycrystal layer can be matched with the rock wear track, the ridge and the end wing inclined surface at the end part can form the cutting force and produce the slag guiding effect, so that the body composite sheet has the auxiliary cutting and track guiding functions, can effectively reduce the impact force in the complex rock stratum, and improves the service life of the body composite sheet. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0019] Figure 2 is the front view structure schematic diagram of the utility model;

[0020] Figure 3 is Figure 2 the A-A direction sectional view structure schematic diagram of the utility model;

[0021] Figure 4 is the three-dimensional structure schematic diagram of the diamond tip;

[0022] Figure 5 is the three-dimensional structure schematic diagram of the body composite sheet;

[0023] Figure 6 is the front view structure schematic diagram of the body composite sheet;

[0024] Figure 7 is the side view structure schematic diagram of the body composite sheet;

[0025] Figure 8 is Figure 7 the B-B direction sectional view structure schematic diagram of the utility model;

[0026] Figure 9 is Figure 7 the C-C direction sectional view structure schematic diagram of the utility model.

[0027] In the figure, 1. tooth base, 11. round table part, 12. groove, 2. diamond tooth tip, 21. hard alloy cone base, 22. diamond polycrystal layer, 23. body groove, 3. body composite piece, 31. hard alloy base sheet, 32. special-shaped polycrystal layer, 321. middle ridge, 322. side wing slope, 323. end ridge, 324. end wing slope, 325. arc-shaped recess, 326. arc-shaped protrusion, 327. round angle. DETAILED DESCRIPTION

[0028] Example one, see attached Figures 1-4 A new type of diamond composite tooth, tooth base 1 and diamond polycrystal tip, the main body of the diamond polycrystal tip is a tooth tip base, the tooth tip base is provided with a diamond polycrystal layer 22 on the tapered tip side, the tip of the tooth base 1 is provided with a round table part 11, the end face of the round table part 11 is provided with a circular groove 12 in the center, the diamond polycrystal tip is embedded in the groove 12, the tapered tooth tip protrudes out of the groove 12, the diamond polycrystal layer 22 is located outside the groove 12, the side surface of the round table part 11 is uniformly provided with a plurality of body grooves 23, the number of body grooves is 6-10, the body grooves 23 are installed with body composite pieces 3, the depth of the body groove 23 is less than the thickness of the body composite piece 3.

[0029] The diamond polycrystal tip of this embodiment is fixed in the groove 12 of the tooth base 1 in an embedded manner, avoiding the thermal damage of traditional brazing to the diamond tooth tip 2, improving the mechanical properties of the diamond tip, and the diamond polycrystal tip adopts a composite structure combining the hard alloy cone base 21 and the diamond polycrystal layer 22, which has both the high wear resistance of diamond and the excellent impact toughness of hard alloy, which is beneficial to reducing the probability of impact failure of the diamond polycrystal tooth tip, playing the advantages of high wear resistance of diamond polycrystal, and improving the service life of the diamond composite tooth.

[0030] Example two, see attached Figure 1 , 5-9, the embodiment is based on the embodiment one, the body composite sheet 3 is provided with an integrated hard alloy base sheet 31 and a shaped polycrystal layer 32, the middle of the shaped polycrystal layer 32 is provided with a middle ridge 321 in the diameter direction, two side wing slopes 322 are symmetrically arranged on both sides of the middle ridge 321, the coverage area of the side wing slope on the shaped polycrystal layer 32 is greater than that of the end wing slope 324, two end ridges 323 are symmetrically arranged at both ends of the middle ridge 321, the end ridges 323 are arranged in a downward inclined manner and are located in the same vertical plane as the middle ridge 321, so that the end ridges 323 and the middle ridge 321 can be in the same cutting path, the cross-sectional size of the end ridge 323 is the same as that of the middle ridge 321, so as to keep the cutting resistance of the end ridge and the middle ridge as uniform as possible, two end wing slopes 324 are symmetrically arranged on both sides of the end ridge 323, and the end wing slope and the side wing slope 322 are connected and smoothly transitioned, and the length direction of the middle ridge 321 is consistent with the axial direction of the cutting tooth base 1.

[0031] The two sides of the side wing slope 322 are provided with arc-shaped recesses 325, and the inner middle part of the end wing slope 324 is provided with arc-shaped protrusions 326, which are matched and connected with the arc-shaped recesses. The interlocking structure of the arc-shaped recesses 325 and the arc-shaped protrusions 326 can improve the overall cutting support strength of the side wing slope 322 and the end wing slope 324.

[0032] The included angle between the two end wing slopes 324 is α, and 10°≤α≤170°. The included angle enables the body composite sheet to have strong cutting force, and the size of the cutting force can be changed by adjusting the included angle, so that it can be suitable for cutting operations of various rocks.

[0033] The end wing slope 324 is an arc surface with a radius R1, R1 ≥20mm, and the side wing slope 322 is an arc surface with a diameter R2, R2 ≥20mm. The arc surfaces of the end wing slope 324 and the side wing slope 322 are arranged to make the stress more uniform during cutting, and the wear is relatively uniform, thereby enhancing the wear resistance. At the same time, the space formed between the arc surface and the rock is conducive to the discharge of cutting chips, thereby improving the chip removal effect.

[0034] The middle ridge 321 is an arc ridge with a radius R3, R3 ≥2mm. The arc-shaped middle ridge 321 also makes the stress more uniform during cutting, thereby enhancing the wear resistance.

[0035] The overall thickness of the composite sheet is a, a ≥2mm, and the overall thickness of the shaped polycrystal layer 32 is b, b ≥1.5mm. By setting the thickness range of the composite sheet and the thickness range of the shaped polycrystal layer 32, the use of the shaped polycrystal layer 32 can be saved as much as possible under the premise of ensuring the cutting strength of the shaped polycrystal layer 32.

[0036] The edge portion of the special poly-crystal layer 32 is provided with a round corner 327, the radius of the round corner 327 is R4, 0.2mm≤R4≤1mm, the roundness of the edge portion of the special poly-crystal layer 32 is improved through the round corner 327.

[0037] The special poly-crystal layer 32 is designed on the composite piece of the embodiment, the side wing inclined surface 322 and the middle convex ridge 321 in the middle portion of the special poly-crystal layer 32 can be matched with the rock abrasion track, the convex ridge and the end wing inclined surface 324 in the end portion can form the cutting force and produce the slag guiding effect, so that the body composite piece 3 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 piece.

Claims

1. A new type of diamond composite pick tooth characterized by: The tooth base body and the diamond tooth tip, the main body of the diamond tooth tip is a hard alloy conical base body, the conical tip side of the conical base body is provided with a diamond polycrystal layer, the tip of the tooth base body is provided with a circular truncated cone part, the end face center of the circular truncated cone part is provided with a groove, the diamond tooth tip is embedded in the groove, the diamond polycrystal layer is located outside the groove, the side surface of the circular truncated cone part is uniformly provided with a plurality of protective body grooves, and the protective body composite piece is installed in the protective body grooves.

2. The novel diamond composite pick tooth according to claim 1, characterized in that: The protective body composite piece comprises an integrally formed hard alloy base sheet and a special-shaped polycrystal layer, the middle part of the special-shaped polycrystal layer is provided with a middle part ridge along the diameter direction, two side wing inclined surfaces are symmetrically arranged on the two sides of the middle part ridge, two end part ridges are symmetrically arranged at the two ends of the middle part ridge, the end part ridges are arranged in a downward inclined manner and are located in the same vertical plane as the middle part ridge, the cross-sectional dimension of the end part ridge is the same as that of the middle part ridge, two end wing inclined surfaces are symmetrically arranged on the two sides of the end part ridge, and the end wing inclined surface and the side wing inclined surface are connected to each other and smoothly transitioned.

3. A novel diamond composite pick tooth according to claim 2, characterized in that: The length direction of the middle part ridge is consistent with the axial direction of the tooth base body.

4. The novel diamond composite pick tooth according to claim 2, characterized in that: 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, and the arc-shaped protruding part is matched and connected to the arc-shaped recessed part.

5. The novel diamond composite pick tooth according to claim 2, characterized in that: The included angle between the two end wing inclined surfaces is α, and 10°≤α≤170°.

6. A novel diamond composite pick tooth according to claim 5, characterized in that: The end wing inclined surface is an arc surface, the radius of the arc surface is R1, and R1≥20 mm.

7. The novel diamond composite pick tooth according to claim 2, characterized in that: The arc surface of the side wing inclined surface, the diameter of the arc surface is R2, and R2≥20 mm.

8. The novel diamond composite pick tooth according to claim 2, characterized in that: The middle part ridge is an arc ridge, the radius of the middle part ridge is R3, and R3≥2 mm.

9. The novel diamond composite pick tooth according to claim 2, characterized in that: The overall thickness of the composite piece is a, a≥2 mm, the overall thickness of the special-shaped polycrystal layer is b, and b≥1.5 mm.

10. The novel diamond composite pick tooth according to claim 2, 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.

Images