Diamond composite tooth for bidirectional rock breaking and production process of hobbing cutter of diamond composite tooth

Abstract

According to the diamond composite tooth for bidirectional rock breaking and the production process of the hobbing cutter of the diamond composite tooth, a transverse convex ridge is arranged on the end face of a composite sheet in the diamond composite tooth in the radial direction, two inclined side faces are symmetrically arranged on the two sides of the transverse convex ridge, two inclined end faces are symmetrically arranged at the two ends of the transverse convex ridge, and each inclined end face comprises two wing-shaped small inclined faces which are symmetrically arranged; the inclined convex ridge is formed between the two wing-shaped small inclined planes, the inclined convex ridge and the transverse convex ridge are located on the same vertical plane, a laser cladding layer in the production process can better protect the cutter ring, the abrasive particle abrasion resistance is improved, then the cutter edge of the hobbing cutter is protected in an all-around mode, the overall service life is prolonged, and the service life of the hobbing cutter is prolonged. Meanwhile, the hob with two kinds of rock breaking capacity and single rock breaking volume can be formed by adjusting the installation technology of the diamond composite teeth, diamond composite teeth of two specifications do not need to be designed in a targeted mode, machining and production of the soft and hard rock hob can be completed only through one production line, the equipment cost and the labor cost for hob manufacturing are effectively reduced, and the production efficiency is improved. The price of the hob is reduced, and the market competitiveness is improved.

Description

Technical Field

[0001] The invention relates to the field of cutting teeth for tunneling equipment, and in particular to a diamond composite tooth for bidirectional rock breaking and a production process of a hob thereof. Background Art

[0002] The shield cutter is the most commonly used tool in shield construction, which consists of four parts: cutter head, cutter disc, transmission mechanism and lining wall cutter. It is mainly used to crush various hard and soft rocks and soil layers, and is used as the main cutting tool in shield construction. The working principle of the shield cutter is to use the blade on the rotating cutter disc to crush and cut the stratum, and then push the blade into the drill bucket through the transmission mechanism to push the stratum into the main body of the shield machine, and finally bring the waste slag to the ground through the conveyor belt. In the process of rock crushing by roller cutters, when encountering hard rock with high strength and good stability, the tooth tips on the roller cutters are required to have strong cutting and rock breaking capabilities; when encountering soft rock with poor mechanical properties and easy plastic deformation, the cutting and rock breaking capabilities of the tooth tips will be reduced, and the single rock breaking volume of the tooth tips will be increased to improve the rock breaking efficiency; therefore, at present, two tooth tips with different structures are usually designed to form two roller cutters with cutting and rock breaking capabilities to adapt to the rock breaking operations of soft rocks and hard rocks. The tooth tips with two structures need to be specifically designed with two production lines, and the production and manufacturing of the tooth tips are completed through two structural designs and processes. The equipment cost and labor cost are high, resulting in high prices for roller cutters, which is not conducive to improving market competitiveness. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a production process of a bidirectional rock-breaking diamond composite tooth and a hob thereof.

[0004] The technical solution of the present invention is: a bidirectional diamond composite tooth for rock breaking, comprising a base and a composite sheet arranged at the upper end of the base, the end face of the composite sheet is provided with a transverse ridge in the radial direction, two inclined side faces are symmetrically provided on both sides of the transverse ridge, two inclined end faces are symmetrically provided at both ends of the transverse ridge, the inclined end face comprises two symmetrically arranged wing-shaped small inclined faces, an oblique ridge is formed between the two wing-shaped small inclined faces, and the oblique ridge and the transverse ridge are located in the same vertical plane.

[0005] Preferably, at least two ridge grooves perpendicularly passing through the transverse ridge are provided in the middle of the end surface of the composite sheet, and a plurality of ridge teeth are formed between the ridge grooves.

[0006] Preferably, the height of the convex ridge teeth increases step by step from one end to the other end.

[0007] Preferably, the transverse ridge has a curvature, and the curvature makes the ridge teeth in the middle higher than the ridge teeth on both sides.

[0008] Preferably, the angle between the two oblique side surfaces is α, 5≤α≤175°, and the angle between the two oblique ridges is β, 5≤β≤175°.

[0009] Preferably, the angle between the two wing-shaped small slopes is γ, 0≤γ≤175°.

[0010] Preferably, the surfaces of the transverse ridges and the oblique ridges are both arc-shaped surfaces, and the diameter of the transverse ridges is r, 0≤r≤40mm.

[0011] Preferably, the height of the inclined side surface is b, b≥1 mm, and the height of the wing-shaped small inclined surface is close to the height of the inclined side surface.

[0012] A production process of a hob, including the above-mentioned bidirectional diamond composite tooth for rock breaking, comprises the following steps:

[0013] ① Process the annular hob cutter ring, and after heat treatment, roughly process a circle of tooth holes at equal intervals along the circumferential direction on the outer side of the cutter ring. The diameter of the tooth holes leaves a machining allowance of 1-2mm for fine machining, and the depth is more than 2mm, which is used to fill the buffer medium;

[0014] ② The cutter ring is preheated at 100-500℃, and kept warm for at least 0.5 after prefabrication. After keeping warm, the rough-machined insert hole is protected to prevent the cladding coating from entering the insert hole and increasing the difficulty of subsequent processing. Then, the outer side of the cutter ring is clad with a strengthening layer by laser cladding equipment. After completion, the cutter ring is heat treated again and kept warm at 100-500℃ for more than 0.5 hours. The laser-clad ceramic or diamond coating can better protect the cutter ring and the position that the diamond composite tooth tip cannot protect, improve the resistance to abrasive wear, and thus comprehensively protect the hob cutting edge. At the same time, it also improves the support capacity of the hob substrate for the diamond composite tooth, prolongs the operation time of the diamond composite tooth, and thus prolongs the overall service life.

[0015] ③ Use a high-precision lathe to fine-process the tooth hole so that the size of the tooth hole matches the size of the diamond composite tooth, and the processing accuracy of the installation hole is controlled within ±0.005mm;

[0016] ④Install the diamond composite teeth into the tooth holes on the cutter ring one by one according to the standard of interference amount of 0.02-0.2mm. Heat the hob before installation at a temperature of 100-500℃ and keep warm for more than 0.5 hours to prepare for the installation of the diamond composite teeth;

[0017] ⑤During the installation process, the hob should be kept warm to avoid the temperature dropping too fast. At the same time, according to the diameter of the alloy hole, the filling amount of the filling medium is calculated according to the following formula:

[0018] M=π(φ / 2) 2×(L / K)×ρ×10 -3

[0019] M: filling medium mass, g; φ: insert hole diameter, mm; L: reserved depth size, the difference between hole depth and alloy insert size, mm; K: empirical value, 0.15-0.25; ρ: filling medium density, g / cm 3 ;

[0020] After weighing the filling medium, install the diamond composite teeth on the special equipment, and use the special tooling to position and adjust the direction of the diamond composite teeth one by one, so that the length direction of the transverse ridge of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring. The pressing pressure of the composite teeth is 5-20 tons. After the installation is completed, the overall heat preservation treatment of the hob is carried out, the treatment temperature is 100-500℃, the heat preservation time is more than 0.5 hours, and it is taken out and slowly cooled to form a hob for hard rock breaking; when the length direction of the transverse ridge of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring, the symmetrically designed wing-shaped small slopes on the polycrystalline layer form an oblique ridge rock breaking structure with strong rock breaking ability. The direction of the oblique ridge rock breaking structure is consistent with the rolling direction of the hob. As the hob rolls, cutting and rock breaking are achieved, which is used to deal with hard rock breaking operations;

[0021] ⑥ According to the installation process of steps ④-⑤, adjust the direction of the diamond composite teeth one by one so that the length direction of the transverse ridge is consistent with the generatrix direction of the outer side of the cutter ring to form a roller cutter for medium-soft rock breaking.

[0022] The beneficial technical effects of the present invention are:

[0023] (1) The laser cladding layer in this production process can better protect the cutter ring, improve the resistance to abrasive wear, and then comprehensively protect the hob cutting edge, improve the support capacity of the cutting edge substrate for the diamond composite teeth, match the service life of the diamond composite teeth, and thus extend the service life of the entire hob. At the same time, by adjusting the installation process of the diamond composite teeth, two types of hobs with rock breaking capabilities and single rock breaking volumes can be formed. There is no need to specifically design two specifications of diamond composite teeth. Only one production line is needed to complete the processing and production of soft and hard rock hobs, which effectively reduces the equipment cost and labor cost of hob manufacturing, which is conducive to reducing the price of hobs and improving market competitiveness.

[0024] (2) The symmetrically designed wing-shaped small slopes on the diamond composite teeth form an oblique ridge rock-breaking structure. The oblique ridges can disperse the overly concentrated load when breaking rocks, so that the diamond composite teeth can stably cut into the rock and gradually transition to the tooth top ridge pressure. The tooth top ridge has a higher rock-breaking ability and increases the pressure depth after structural optimization. This structure can achieve the diamond composite teeth to stably cut into the rock and gradually increase the rock-breaking depth when the hob is breaking rocks. It not only plays the advantage of diamond wear resistance, but also solves the disadvantage of diamond composite teeth being fragile through structural design. It is suitable for hard rock breaking operations with high efficiency and long life; the transverse ridges formed on the two oblique sides can break rocks horizontally. Although this structure has a relatively weak rock-breaking ability, it has the advantage of a large single rock-breaking volume. It is suitable for medium-soft rock breaking operations that do not require high pressure and cutting forces. With the support of diamond composite teeth and laser cladding strengthening coating, the hob can achieve long-term high-efficiency cutting, which can greatly improve production efficiency, reduce tool change frequency, shorten production cycle and save unit cost. This diamond composite tooth with bidirectional rock breaking function can achieve efficient rock breaking of soft and hard rocks respectively, expand the application range of diamond composite teeth and increase service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is one of the structural diagrams of diamond composite teeth;

[0026] Figure 2 yes Figure 1 Schematic diagram of the main structure;

[0027] Figure 3 yes Figure 1 A side view schematic diagram of the structure;

[0028] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure;

[0029] Figure 5 This is the second structural diagram of the diamond composite tooth;

[0030] Figure 6 yes Figure 5 A side view schematic diagram of the structure;

[0031] Figure 7 This is the third structural diagram of the diamond composite tooth;

[0032] Figure 8 This is the fourth structural diagram of the diamond composite tooth;

[0033] Fig. 9 yes Figure 1 One of the structural schematic diagrams of the diamond composite teeth installed on the hob;

[0034] Fig.10 yes Fig. 9AA section structural diagram;

[0035] Fig.11 yes Figure 1 The second structural diagram of the diamond composite teeth installed on the hob;

[0036] Fig.12 yes Figure 5 Schematic diagram of the structure in which the diamond composite teeth are installed on the hob;

[0037] Fig.13 yes Figure 7 Schematic diagram of the structure in which the diamond composite teeth are installed on the hob;

[0038] Fig.14 Schematic diagram of the structure in which the tooth grooves on the cutter ring are arranged in an S shape and diamond composite teeth are installed.

[0039] In the figure, 01. diamond composite tooth, 2. substrate, 3. composite sheet, 31. transverse ridge, 32. oblique side surface, 33. wing-shaped small slope, 34. oblique ridge, 35. ridge groove, 36. ridge tooth, 41. cutter ring, 51. cladding coating.

[0040] Embodiment 1, see attached Figure 1-8 A diamond composite tooth for bidirectional rock breaking comprises a substrate 2 and a diamond polycrystalline layer (hereinafter referred to as the polycrystalline layer) arranged on the upper end of the substrate. The diameters of the substrate 2 and the polycrystalline layer are greater than or equal to 10 mm. A transverse ridge 31 is radially arranged on the end face of the polycrystalline layer. Two inclined side faces 32 are symmetrically arranged on both sides of the transverse ridge 31. The transverse ridge 31 has a weak rock breaking ability for directly breaking rocks, but a large rock breaking volume, and is used to cope with soft rock cutting and breaking operations; two inclined end faces are symmetrically arranged at both ends of the transverse ridge 31, and the inclined end faces include two symmetrically arranged wing-shaped small inclined faces 33, and an oblique ridge 34 is formed between the two wing-shaped small inclined faces. The rock breaking structure of the oblique ridge 34 improves the impact resistance, and at the same time, the contact area with the rock surface at the moment of rock breaking is small, the rock breaking resistance is small, and the rock cutting and breaking ability is strong, and it is used to cope with hard rock cutting and breaking operations. The oblique ridge 34 and the transverse ridge 31 are located in the same vertical plane.

[0041] At least two ridge grooves 35 are provided in the middle of the end face of the polycrystalline layer, which pass through the transverse ridge 31 vertically. A number of ridge teeth 36 are formed between the ridge grooves 35. The ridge teeth can reduce the pressing area of ​​the composite sheet 3 and effectively utilize the thrust of the equipment. At the same time, they can increase the deformation space of the rock in the ridge groove 35 and provide storage space for rock fragments. The rock-breaking structure of the oblique ridge 34 with strong rock-breaking ability formed by the wing-shaped small slope 33 can further improve the efficiency of single-tooth secondary rock breaking. Combined with the high wear resistance of the diamond composite sheet 3, long-term and efficient rock breaking can be achieved.

[0042] The ridge teeth 36 are designed to have a height dimension that gradually increases from one end of the transverse ridge 31 to the other end, forming a stepped serrated cutting rock-breaking structure that gradually presses into the rock to increase the rock-breaking depth. The rock-breaking resistance of gradually pressing into the rock to increase the rock-breaking depth is smaller, and the rock-breaking speed is high. At the same time, it can reduce the wear and attenuation rate of the polycrystalline layer, and has better slag and chip holding and slag and chip removal functions, and is used to cope with hard rock cutting and rock-breaking operations. In order to form stable and orderly rock breaking, the height difference between adjacent ridge teeth 36 does not exceed 2mm.

[0043] The transverse ridge 31 is designed to have an arc, so that the ridge teeth 36 in the middle are higher than the ridge teeth 36 on both sides, forming an arc-shaped serrated structure on the upper part of the composite sheet 3, which also has the performance of further reducing the rock breaking resistance, and has better slag and chip holding and slag and chip discharge functions, thereby greatly improving the rock breaking efficiency.

[0044] The angle between the two oblique side surfaces 32 is α, 5≤α≤175°, the angle between the two oblique ridges 34 is β, 5≤β≤175°, the angle between the two wing-shaped small slopes 33 is γ, 0≤γ≤175°, the surfaces of the transverse ridge 31 and the oblique ridge 34 are both arc-shaped surfaces, the diameter of the transverse ridge 31 is r, 0≤r≤40mm, the height of the oblique side surface 32 is b, b≥1mm, and the height of the wing-shaped small slope 33 is close to the height of the oblique side surface 32.

[0045] The bidirectional rock-breaking diamond composite tooth 01 of this embodiment forms a rock-breaking structure of an oblique ridge 34 through a symmetrically designed wing-shaped small inclined surface 33. When the hob rolls and breaks the rock under heavy load, the oblique ridge 34 is pressed in first to initially suppress the rock breaking, and at the same time can disperse the overly concentrated load, so as to avoid the phenomenon of rapid failure caused by the composite sheet 3 being broken, the layer collapse, etc., and smoothly transitions to the transverse ridge 31 for rock breaking, which can increase the pressing depth and the rock breaking volume, and improve the rock breaking efficiency, thereby achieving the purpose of efficient rock breaking and long service life of hard rock formations; when the transverse ridge 31 formed by the two oblique side surfaces 32 breaks the rock horizontally, the contact area is large, resulting in relatively weak rock breaking ability, but the volume of single rock breaking can be greatly increased, and the use effect is better for soft rock breaking operations that do not require high pressing force and cutting force. This diamond composite tooth 01 with bidirectional rock breaking function can achieve efficient rock breaking of medium, soft and hard rocks respectively, and greatly improve the application range and service life of the diamond composite tooth 01.

[0046] Embodiment 2, see attached Figure 9-14 A production process of a hob includes a bidirectional rock-breaking diamond composite tooth 01 as described in Example 1, and the steps are as follows:

[0047] ① Processing a ring-shaped hob cutter ring 41, and after heat treatment, roughly processing a circle of tooth holes at equal intervals along the circumferential direction on the outer side of the cutter ring 41, the diameter of the tooth holes leaves a machining allowance of 1-5mm for fine processing, and the depth is more than 2mm, which is used to fill the buffer medium;

[0048] ② The cutter ring 41 is preheated at 100-500℃, and is kept warm for at least 0.5 after prefabrication. After the heat preservation, the rough-machined insert hole is protected to prevent the cladding coating 51 from entering the insert hole and increasing the difficulty of subsequent processing. Then, the outer side of the cutter ring 41 is clad with a strengthening layer by laser cladding equipment. After completion, the cutter ring 41 is heat-treated again and kept warm at 100-500℃ for more than 0.5 hours. The laser-clad ceramic or diamond coating can better protect the cutter ring 41, protect the position that the diamond composite tooth 01 tip cannot protect, improve the resistance to abrasive wear, and thus comprehensively protect the hob cutting edge. At the same time, it also improves the support capacity of the hob substrate for the diamond composite tooth 01, prolongs the operation time of the diamond composite tooth 01, and thus prolongs the overall service life.

[0049] ③ Use a high-precision lathe to fine-process the tooth hole so that the size of the tooth hole matches the size of the diamond composite tooth 01, and the processing accuracy of the installation hole is controlled within ±0.005mm;

[0050] ④Install the diamond composite teeth 01 into the insert holes on the cutter ring 41 one by one according to the standard of interference amount of 0.02-0.2mm. Heat the hob before installation at a temperature of 100-500℃ and keep warm for more than 0.5 hours to prepare for the installation of the diamond composite teeth 01;

[0051] ⑤During the installation process, the hob should be kept warm to avoid the temperature dropping too fast. At the same time, according to the diameter of the alloy hole, the filling amount of the filling medium is calculated according to the following formula:

[0052] M=π(φ / 2) 2 ×(L / K)×ρ×10 -3

[0053] M: filling medium mass, g; φ: insert hole diameter, mm; L: reserved depth size, the difference between hole depth and alloy insert size, mm; K: empirical value, 0.15-0.25, generally 0.2; ρ: filling medium density, g / cm 3 ;

[0054] After weighing the filling medium, the diamond composite tooth 01 is installed on the special equipment, and the direction of the diamond composite tooth 01 is positioned and adjusted one by one through the special tooling, so that the length direction of the transverse ridge 31 of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring 41, and the pressing pressure of the composite tooth is 5-20 tons. After the installation is completed, the overall heat preservation treatment of the roller is carried out, the treatment temperature is 100-500℃, the heat preservation time is more than 0.5 hours, and it is taken out and slowly cooled to form a roller for hard rock breaking; when the length direction of the transverse ridge 31 of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring 41, the symmetrically designed wing-shaped small slopes 33 on the polycrystalline layer form an oblique ridge 34 rock-breaking structure with strong rock-breaking ability, and the direction of the oblique ridge 34 rock-breaking structure is consistent with the rolling direction of the roller, and the rock is cut and broken as the roller rolls, which is used to deal with hard rock breaking operations.

[0055] ⑥ During the installation process of steps ④-⑤, the directions of the diamond composite teeth 01 are adjusted one by one so that the length direction of the transverse ridge 31 is consistent with the generatrix direction of the outer side surface of the cutter ring 41 to form a roller cutter for medium soft rock. When the length direction of the transverse ridge 31 of the polycrystalline layer is consistent with the generatrix direction of the outer side surface of the cutter ring 41, the symmetrically designed inclined side surface 32 on the polycrystalline layer forms a side ridge rock breaking structure with weakened rock breaking ability but larger rock breaking volume. The direction of the side ridge rock breaking structure is consistent with the rolling direction of the roller cutter. As the roller cutter rolls, rock cutting and breaking are achieved, which is used to cope with hard rock breaking operations.

[0056] Embodiment 3: This embodiment is basically the same as embodiment 1, except that the tooth holes in step ① are arranged in an S-shape along the outer side of the cutter ring 41 to form a three-to-three coordinated rock-breaking tooth arrangement structure. Each group of diamond composite teeth 01 includes a main tooth and two auxiliary teeth distributed on both sides of the main tooth. The diameter and exposed tooth height of the main tooth are greater than those of the auxiliary teeth. Depending on the rock formation, the height difference between the main tooth and the auxiliary tooth is not greater than 3 mm. The main rock-breaking tooth is mainly used to form the main crack of the rock formation. The diameter of the main rock-breaking tooth is greater than or equal to 19 mm to ensure sufficient compressive resistance. At the same time, the tooth arrangement is located in the middle of the width of the hob blade. The auxiliary teeth use special PDC teeth (diamond composite teeth 01) with relatively small diameters, which can reduce the secondary rock-breaking resistance and improve the rock-breaking efficiency. At the same time, the two auxiliary teeth are located on both sides of the blade width direction. On the basis of the main crack formed by the main tooth, the crack is further extended in the width direction and connected with the adjacent hob crack to form complementary rock breaking, mainly large-area volume rock breaking, greatly improving the rock breaking efficiency, and thus improving the entire shield tunneling efficiency.

Claims

1. A diamond composite tooth for bidirectional rock breaking, characterized by: It includes a base body and a composite sheet arranged at the upper end of the base body, the end face of the composite sheet is provided with a transverse ridge in the radial direction, two inclined side faces are symmetrically provided on both sides of the transverse ridge, two inclined end faces are symmetrically provided at both ends of the transverse ridge, the inclined end faces include two symmetrically arranged wing-shaped small inclined faces, an oblique ridge is formed between the two wing-shaped small inclined faces, and the oblique ridge and the transverse ridge are located in the same vertical plane.

2. The bidirectional diamond composite tooth for rock breaking according to claim 1 is characterized by: At least two ridge grooves perpendicularly passing through the transverse ridge are arranged in the middle of the end surface of the composite sheet, and a plurality of ridge teeth are formed between the ridge grooves.

3. The bidirectional diamond composite tooth for rock breaking according to claim 2 is characterized by: The height of the convex ridge teeth increases step by step from one end to the other end.

4. The bidirectional diamond composite tooth for rock breaking according to claim 2 is characterized by: The transverse ridge has a curvature, and the curvature makes the ridge teeth in the middle higher than the ridge teeth on both sides.

5. The bidirectional diamond composite tooth for rock breaking according to claim 1 is characterized by: The angle between the two oblique side surfaces is α, 5≤α≤175°, and the angle between the two oblique ridges is β, 5≤β≤175°.

6. The bidirectional diamond composite tooth for rock breaking according to claim 1 is characterized by: The angle between the two wing-shaped small inclined surfaces is γ, 0≤γ≤175°.

7. The bidirectional diamond composite tooth for rock breaking according to claim 1 is characterized by: The surfaces of the transverse ridge and the oblique ridge are both arc-shaped surfaces, and the diameter of the transverse ridge is r, 0≤r≤40mm.

8. The bidirectional diamond composite tooth for rock breaking according to claim 1 is characterized by: The height of the inclined side surface is b, b≥1mm, and the height of the wing-shaped small inclined surface is close to the height of the inclined side surface.

9. A production process for a roller cutter, comprising a bidirectional diamond composite tooth for rock breaking as claimed in any one of claims 1 to 8, Its characteristics include the following steps: ① Process the annular hob cutter ring, and after heat treatment, roughly process a circle of tooth holes at equal intervals along the circumferential direction on the outer side of the cutter ring. The diameter of the tooth holes leaves a machining allowance of 1-2mm for fine machining, and the depth is more than 2mm, which is used to fill the buffer medium; ② The cutter ring is preheated at 100-500℃, and kept warm for at least 0.5 after prefabrication. After keeping warm, the rough-machined insert hole is protected to prevent the cladding coating from entering the insert hole and increasing the difficulty of subsequent processing. Then, the outer side of the cutter ring is clad with a strengthening layer by laser cladding equipment. After completion, the cutter ring is heat treated again and kept warm at 100-500℃ for more than 0.5 hours. The laser-clad ceramic or diamond coating can better protect the cutter ring and the position that the diamond composite tooth tip cannot protect, improve the resistance to abrasive wear, and thus comprehensively protect the hob cutting edge. At the same time, it also improves the support capacity of the hob substrate for the diamond composite tooth, prolongs the operation time of the diamond composite tooth, and thus prolongs the overall service life. ③ Use a high-precision lathe to fine-process the tooth hole so that the size of the tooth hole matches the size of the diamond composite tooth, and the processing accuracy of the installation hole is controlled within ±0.005mm; ④Install the diamond composite teeth into the tooth holes on the cutter ring one by one according to the standard of interference amount of 0.02-0.2mm. Heat the hob before installation at a temperature of 100-500℃ and keep warm for more than 0.5 hours to prepare for the installation of the diamond composite teeth; ⑤During the installation process, the hob should be kept warm to avoid the temperature dropping too fast. At the same time, according to the diameter of the alloy hole, the filling amount of the filling medium is calculated according to the following formula: M=π(φ / 2) 2 ×(L / K)×ρ×10 -3 M: filling medium mass, g; φ: diameter of the tooth hole, mm; L: reserved depth, the difference between the hole depth and the alloy inlay size, mm; K: empirical value, 0.15-0.25; ρ: filling medium density, g / cm 3 ; After weighing the filling medium, install the diamond composite teeth on the special equipment, and use the special tooling to position and adjust the direction of the diamond composite teeth one by one, so that the length direction of the transverse ridge of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring. The pressing pressure of the composite teeth is 5-20 tons. After the installation is completed, the overall heat preservation treatment of the hob is carried out, the treatment temperature is 100-500℃, the heat preservation time is more than 0.5 hours, and it is taken out and slowly cooled to form a hob for hard rock breaking; when the length direction of the transverse ridge of the polycrystalline layer is consistent with the tangent direction of the outer side of the cutter ring, the symmetrically designed wing-shaped small slopes on the polycrystalline layer form an oblique ridge rock breaking structure with strong rock breaking ability. The direction of the oblique ridge rock breaking structure is consistent with the rolling direction of the hob. As the hob rolls, cutting and rock breaking are achieved, which is used to deal with hard rock breaking operations; ⑥ According to the installation process of steps ④-⑤, adjust the direction of the diamond composite teeth one by one so that the length direction of the transverse ridge is consistent with the generatrix direction of the outer side of the cutter ring to form a roller cutter for medium-soft rock breaking.

Images