Plasma cladding and implanting diamond particles into a shield cutter ring and a method for manufacturing the same

Abstract

This invention relates to the field of shield tunneling cutter manufacturing technology, and in particular to a plasma-clad diamond particle-embedded shield cutter ring and its preparation method. The cutter ring includes a cutter ring body, a plasma-clad wear-resistant layer, diamond particles implanted in the wear-resistant layer, and cemented carbide ball studs. A ball stud inlay groove is machined on the outer circumference of the cutter ring body, and the lower part of the cemented carbide ball stud is embedded in the ball stud inlay groove on the outer circumference of the cutter ring body. Wear-resistant layer grooves are formed on the cutter ring body between adjacent ball stud inlay grooves, and a wear-resistant layer is clad within these grooves. Implanting diamond particles during plasma welding of the wear-resistant layer not only gives the wear-resistant layer a certain degree of toughness but also utilizes the wear-resistant properties of the diamond particles, thus improving the service life of the wear-resistant layer. Simultaneously, adding a wear-resistant layer groove between two cemented carbide ball studs on the cutter ring body improves the wear resistance of the cutter ring body.

Description

Technical Field

[0001] This invention relates to the field of shield tunneling cutter manufacturing technology, and in particular to a plasma-clad diamond particle-embedded shield cutter ring and its preparation method. Background Technology

[0002] Toothed cutter rings are tool bases used to embed cutting teeth. Statistics from domestic subway tunnel construction show that the application of toothed cutter rings in tunnel construction has become increasingly widespread in recent years. These rings have a wear-resistant layer, and the lifespan of this layer is currently a weakness, directly affecting the overall service life of the cutter ring, leading to frequent tool replacements, increased construction costs, and higher risks. Currently, common wear-resistant layer types for toothed cutter rings on the market include: electric-welded FeCrBSi wear-resistant layers, tungsten carbide particle implantation wear-resistant layers, plasma-welded tungsten carbide wear-resistant layers, and laser-welded tungsten carbide wear-resistant layers. However, in actual construction applications, toothed cutter rings often experience premature wear of the wear-resistant layer in highly abrasive strata, resulting in abnormal damage to the cutter ring. Therefore, improving the lifespan of the wear-resistant layer in toothed cutter rings is a pressing problem that needs to be solved in their application. Summary of the Invention

[0003] The purpose of this invention is to provide a plasma cladding diamond particle-embedded shield cutter ring and its preparation method. This preparation method can implant diamond particles during plasma welding of the wear-resistant layer, which can not only give the wear-resistant layer a certain toughness, but also utilize the wear-resistant properties of diamond particles to improve the service life of the wear-resistant layer. At the same time, a wear-resistant layer groove is added between the two cemented carbide ball pins in the cutter ring body to improve the wear resistance of the cutter ring body.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A plasma-clad diamond particle-embedded shield cutter ring includes a cutter ring body, a plasma-clad wear-resistant layer, diamond particles implanted in the wear-resistant layer, and cemented carbide ball studs. The cutter ring body is generally a circular ring structure, with ball stud inlay grooves machined on the outer circumference of the cutter ring body. The ball stud inlay grooves are evenly distributed on the cutter ring body. The lower part of the cemented carbide ball studs is embedded in the ball stud inlay grooves on the outer circumference of the cutter ring body. Wear-resistant layer grooves are formed on the cutter ring body between adjacent ball stud inlay grooves, and a wear-resistant layer is clad in the wear-resistant layer grooves to increase the wear resistance and impact resistance of the inter-tooth wear-resistant layer. A wear-resistant layer is applied on the outer side of the ball stud inlay grooves on the cutter ring body, and diamond particles are sprayed and implanted in the wear-resistant layer.

[0005] The wear-resistant layer is clad in the wear-resistant layer groove and on the outer side of the ball nail inlay groove on the blade ring body by plasma cladding; during plasma welding of the wear-resistant layer, an external particle feeding device is used to implant 20-40 mesh diamond particles into the wear-resistant layer.

[0006] Furthermore, the mass percentages of each element in the wear-resistant layer matrix powder are as follows: C 0.15-0.24%, Ni 2.2-3.0%, Cr 16.8-17.8%, B 0.7-0.92%, Si 0.6-0.8%, Fe balance, and the powder particle size is 100-270 mesh.

[0007] Furthermore, the blade ring body is made of 40CrNiMoA forging and then machined, and the heat treatment hardness is 40-45HRC.

[0008] Furthermore, the carbide ball nail is composed of 15% Co and 85% WC, and the hardness of the carbide ball nail is 84-85 HRA.

[0009] A method for preparing a plasma-clad diamond particle-embedded shield cutter ring includes the following steps: S1. After being forged by die forging equipment, the blade ring body is normalized by heat treatment equipment to refine the grains, homogenize the structure and reduce the processing hardness of the ring body. S2. The blank of the cutter ring body is rough-machined and semi-finished by machining equipment to produce the outer contour of the cutter ring body and the wear-resistant layer groove between the carbide ball pins. Then, it is heat-treated to a hardness of 40-45HRC. S3. Preheat the blade ring body to 250-300℃, and use a plasma welding robot to weld the wear-resistant layer and the wear-resistant layer between the ball studs. The wear-resistant layer powder has a particle size of 100-270 mesh. During welding, an external particle feeding device is used to implant 20-40 mesh diamond particles into the wear-resistant layer. The wear-resistant layer thickness is 2-4mm. After welding, slow cooling is performed to remove welding stress. S4. Use a CNC milling machine to machine carbide ball screw holes; S5. Carbide ball studs are set using the cold setting method. The carbide ball studs are composed of 15% Co and 85% WC, with a hardness of 84-85 HRA. S6. Fine grinding of the inner hole.

[0010] The beneficial effects of this invention are as follows: The overall structural design of the plasma cladding implanted diamond particle toothed shield cutter ring of this invention is scientific, and compared with the existing toothed shield cutter rings, it has the following technical features and advantages: 1. Compared with the existing toothed shield cutter ring, the present invention implants diamond particles in the wear-resistant layer during plasma welding of the wear-resistant layer. The wear-resistant layer containing diamond particles can not only make the wear-resistant layer have a certain toughness, but also utilize the wear-resistant properties of diamond particles to improve the service life of the wear-resistant layer. 2. The plasma cladding implanted diamond particle toothed shield cutter ring of the present invention adds a wear-resistant layer groove between two cemented carbide ball nails (also between adjacent ball nail inlay grooves) on the cutter ring body. Since the cutter ring body has good toughness but poor wear resistance, and the wear-resistant layer has good wear resistance but relatively poor toughness, this design can increase the wear-resistant storage capacity of the wear-resistant layer between the ball nails, while also protecting the wear-resistant layer on both sides of the body of the groove; giving the toothed cutter ring an extremely long service life; and meeting the user's construction and use requirements. Attached Figure Description

[0011] Figure 1 This is a front view of the shield cutterhead ring with diamond particle inlay implanted by plasma cladding according to the present invention; Figure 2 This is a cross-sectional view of the shield cutter ring with diamond particle implantation by plasma cladding according to the present invention. Figure 3 A diagram of the toothed cutter ring in a shield tunneling machine with diamond particle-insulated cutter rings implanted by plasma cladding. Figure 4 This is a partial structural diagram of the toothed cutter ring body of the present invention; Figure 5 This is an illustration of an embodiment of the present invention involving plasma bonding for implanting diamond particles; The following are labeled in the diagram: 1. Blade ring body; 2. Wear-resistant layer; 3. Carbide ball nail; 4. Wear-resistant layer groove; 5. Plasma welding robot; 6. External particle feeding device; 7. Worktable. Detailed Implementation

[0012] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly or indirectly connected to the other element. When an element is referred to as "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used in this application to indicate orientation are based on the specific structure shown in the accompanying drawings and do not constitute a limitation on the structure.

[0013] Specific Embodiment 1: As per the appendix to the specification of this invention. Figure 1 Instruction manual attached Figure 2 Instruction manual attached Figure 3 and instruction manual attached Figure 4As shown, the present invention provides a plasma-clad diamond particle-embedded shield cutter ring, comprising a cutter ring body 1, a plasma-clad wear-resistant layer 2, diamond particles implanted in the wear-resistant layer 2, and cemented carbide ball studs 3; the cutter ring body 1 is an overall annular structure, forged from 40CrNiMoA and then machined, with a heat treatment hardness of 40-45HRC; a ball stud inlay groove adapted for embedding the cemented carbide ball studs 3 is machined on the outer circumference of the cutter ring body 1, as shown in the attached specification. Figure 3 As shown, the ball stud inlay grooves are evenly distributed and machined on the outer circle of the cutter ring body 1.

[0014] As per the specification attached to this invention Figure 2 As shown, the lower part of the cemented carbide ball stud 3 is embedded in the ball stud inlay groove on the outer circle of the cutter ring body 1; a wear-resistant layer groove 4 is formed on the cutter ring body 1 between adjacent ball stud inlay grooves, and a wear-resistant layer 2 is fused into the wear-resistant layer groove 4 to increase the wear resistance and impact resistance of the inter-tooth wear-resistant layer 2; a wear-resistant layer 2 is also applied to the outer side of the ball stud inlay groove on the cutter ring body 1, and the mass percentage of each element in the matrix powder of the wear-resistant layer 2 is as follows: C is 0.15-0.24%, Ni is 2.2-3.0%, C The composition of the powder is 16.8-17.8%, B is 0.7-0.92%, Si is 0.6-0.8%, and Fe is the balance. The powder particle size is 100-270 mesh. Simultaneously, during the plasma welding of the wear-resistant layer 2, the present invention adds 20-40 mesh diamond particles to the molten pool through an external particle feeding device 6, so that the 20-40 mesh diamond particles are implanted in the wear-resistant layer 2. The cemented carbide ball nail 3 is mainly composed of 15% Co and 85% WC, and the hardness of the cemented carbide ball nail 3 is 84-85 HRA.

[0015] The plasma cladding implanted diamond particle toothed shield cutter ring of the present invention is manufactured using the following preparation method: Step 1: The blade ring body 1 is forged by die forging equipment and then normalized by heat treatment equipment to refine the grains, homogenize the structure and reduce the processing hardness of the ring body; Step 2: Roughly and semi-finish the blank of the cutter ring body 1 using machining equipment to machine the outer contour of the cutter ring body 1 and the wear-resistant layer groove 4 between the carbide ball pins 3. Then, perform heat treatment to achieve a hardness of 40-45HRC. Step 3: Preheat the blade ring body 1 to 250-300℃, and use a plasma welding robot to weld the wear-resistant layer 2 and the wear-resistant layer 2 between the ball nails. The powder particle size of the wear-resistant layer 2 is 100-270 mesh. During welding, an external particle feeding device 6 is used to implant 20-40 mesh diamond particles into the wear-resistant layer 2. The thickness of the wear-resistant layer 2 is 2-4mm. After welding, slow cooling is performed to remove welding stress. Step 4: Use a CNC milling machine to machine the three holes in the carbide ball screw; Step 5: Set the carbide ball pin 3 using the cold setting method. The carbide ball pin 3 is composed of 15% Co and 85% WC, with a hardness of 84-85 HRA. Step 6: Grind the inner hole.

[0016] In summary, the plasma cladding diamond particle-embedded shield cutter ring of the present invention, during its specific manufacturing process, involves implanting diamond particles into the wear-resistant layer 2 via an external particle feeding device 6 during plasma welding. This operation produces a wear-resistant layer 2 that possesses both a certain degree of toughness and utilizes the wear-resistant properties of the diamond particles, thereby improving the service life of the wear-resistant layer 2. Furthermore, to address the issue that the cutter ring body 1 has good toughness but poor wear resistance, while the wear-resistant layer 2 has good wear resistance but relatively poor toughness, a wear-resistant layer groove 4 is added between the two carbide ball studs 3 of the cutter ring body 1 (on the cutter ring body 1 between adjacent ball stud inlay grooves). This measure increases the wear-resistant capacity of the wear-resistant layer 2 between the carbide ball studs 3, while also ensuring that the body on both sides of the groove protects the wear-resistant layer 2. The measures taken by the present invention result in a cutter ring with an extremely long service life, meeting the user's construction and usage requirements. The above describes and illustrates the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A plasma-clad diamond particle-embedded shield cutter ring, characterized in that, The device includes a cutter ring body, a plasma-clad wear-resistant layer, diamond particles implanted in the wear-resistant layer, and cemented carbide ball studs. The cutter ring body is an overall annular structure, with ball stud inlay grooves machined on its outer circumference. These grooves are evenly distributed across the cutter ring body. The lower part of each cemented carbide ball stud is embedded in a ball stud inlay groove on the outer circumference of the cutter ring body. Wear-resistant layer grooves are formed on the cutter ring body between adjacent ball stud inlay grooves, and a wear-resistant layer is clad in these grooves to increase the wear resistance and impact resistance of the inter-tooth wear-resistant layer. A wear-resistant layer is applied to the outer side of the ball stud inlay grooves on the cutter ring body, and diamond particles are sprayed and implanted within the wear-resistant layer.

2. The plasma-clad diamond particle-embedded shield cutter ring according to claim 1, characterized in that, The wear-resistant layer is clad in the wear-resistant layer groove and on the outer side of the ball nail inlay groove on the blade ring body by plasma cladding; during plasma welding of the wear-resistant layer, an external particle feeding device is used to implant 20-40 mesh diamond particles into the wear-resistant layer.

3. The plasma cladding implanted diamond particle toothed shield cutter ring according to claim 2, characterized in that, The mass percentages of each element in the wear-resistant layer matrix powder are as follows: C 0.15-0.24%, Ni 2.2-3.0%, Cr 16.8-17.8%, B 0.7-0.92%, Si 0.6-0.8%, Fe balance, and the powder particle size is 100-270 mesh.

4. The plasma-clad diamond particle-embedded shield cutter ring according to claim 1, characterized in that, The blade ring body is made of 40CrNiMoA forging and then machined, and the heat treatment hardness is 40-45HRC.

5. The plasma cladding implanted diamond particle toothed shield cutter ring according to claim 1, characterized in that, The carbide ball nail is composed of 15% Co and 85% WC, and the hardness of the carbide ball nail is 84-85 HRA.

6. The method for preparing a plasma-clad diamond particle-embedded shield cutter ring as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. After being forged by die forging equipment, the blade ring body is normalized by heat treatment equipment to refine the grains, homogenize the structure and reduce the processing hardness of the ring body. S2. The blank of the cutter ring body is rough-machined and semi-finished by machining equipment to produce the outer contour of the cutter ring body and the wear-resistant layer groove between the carbide ball pins. Then, it is heat-treated to a hardness of 40-45HRC. S3. Preheat the blade ring body to 250-300℃, and use a plasma welding robot to weld the wear-resistant layer and the wear-resistant layer between the ball studs. The wear-resistant layer powder has a particle size of 100-270 mesh. During welding, an external particle feeding device is used to implant 20-40 mesh diamond particles into the wear-resistant layer. The wear-resistant layer thickness is 2-4mm. After welding, slow cooling is performed to remove welding stress. S4. Use a CNC milling machine to machine carbide ball screw holes; S5. Carbide ball studs are set using the cold setting method. The carbide ball studs are composed of 15% Co and 85% WC, with a hardness of 84-85 HRA. S6. Fine grinding of the inner hole.

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