Bit leg three-point positioning hole machining device

Abstract

The utility model discloses a bit leg three-point positioning hole machining device which comprises a workbench. A clamping device is fixed on the workbench and is used for clamping a shaft neck of a bit leg with an upward leg back; a limiting supporting device is fixed to the workbench in a sliding mode, supporting is carried out below a slurry hole in the tail of a bit leg, and the limiting supporting device comprises circumferential coarse positioning and circumferential fine positioning. The positioning hole can be accurately machined, and the bit leg is prevented from rotating.

Description

Technical Field

[0001] The utility model relates to the technical field of tooth palm processing, in particular to a tooth palm three-point positioning hole processing device. Background Art

[0002] The tooth palm is one of the important parts of the three-cone drill bit. The surface of the tooth palm journal must have high hardness, high precision and high finish, so the journal must be finish turned after heat treatment. The journal turning often adopts the positioning method of two sides and one pin for processing, but it is difficult to ensure the repeat positioning accuracy by continuing to use this method for the finish turning of the journal after heat treatment, because the deformation of the 120-degree V-face of the tooth palm is large, resulting in serious deviation of the journal runout after clamping. Since the finishing allowance of the journal is very small, the deviation of the runout cannot guarantee the hardness, precision and finish of the journal. The patent with application number 202110088016.2 discloses a method for three-point positioning and finish turning of the journal, but there is no method for precise processing of these three positioning holes in the prior art. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the shortcomings of the background technology, the utility model discloses a tooth palm three-point positioning hole processing device.

[0004] Technical solution: The tooth palm three-point positioning hole processing device disclosed in the utility model includes:

[0005] Workbench;

[0006] A clamping device is fixed on the workbench to clamp the journal of the tooth palm with the back of the palm facing upwards;

[0007] The workbench can be slidably fixed with a limited position support device to provide support below the pulp hole at the tail of the tooth palm, and the limited position support device includes circumferential rough positioning and circumferential fine positioning.

[0008] Furthermore, a linear slide groove is provided on the workbench, the clamping device is fixed in the linear slide groove by screws, and the limit support device is fixed in the linear slide groove by screws, and the distance between the limit support device and the clamping device is adjusted by loosening the screws.

[0009] Furthermore, the clamping device includes a chuck base, a chuck and a claw. The chuck is placed on the chuck base, and the claw is placed on the chuck to clamp the shaft neck. The upper surface of the chuck base is inclined. After the shaft neck is clamped by the inclined angle, the intersection line of the inner side of the tooth palm is parallel to the workbench.

[0010] Furthermore, the position limiting support device includes a position limiting base and a circumferential rough positioning and a circumferential fine positioning.

[0011] Furthermore, the circumferential rough positioning includes a through hole opened on the side of the limit base, and an L-shaped limit piece is provided in the through hole. When the shaft neck is clamped, the side limit position is adjusted by moving in the through hole to limit one side of the tail of the tooth palm. The limit base is also provided with a first clamping screw inserted from the end to tighten the L-shaped limit piece to achieve circumferential rough positioning.

[0012] Furthermore, the circumferential fine positioning includes a strip groove opened just above the limit base. After the axial neck of the tooth palm is fixed, the inner wall of the pulp hole of the tooth palm is opposite to the strip groove, and the circumferential rough positioning is achieved. Two wedge-shaped support blocks are provided in the strip groove, which are inserted into the tooth palm from one side of the strip groove, and the two outer edges are simultaneously abutted against the inner wall of the pulp hole. The limit base is also provided with a second clamping screw inserted from the side to tighten the wedge-shaped support block.

[0013] Furthermore, the angle of the upper bevel of the wedge-shaped support block is 5-10°.

[0014] Beneficial effects: Compared with the prior art, the utility model realizes precise processing of the positioning hole by first fixing the shaft neck and then combining the side limiter and the double edge positioning, thereby avoiding the rotation of the tooth palm;

[0015] In order to ensure the repeatability of the journal during fine machining, the journal must be used for positioning when machining the locating holes, and the diameter of the locating holes machined in the same batch and the consistency of the spatial dimensions of the three locating holes relative to the journal must be strictly guaranteed. Conversely, the journal can be machined based on the three locating holes to ensure the repeatability of the journal. However, since the journal is in an inclined state, the origin set on the journal during programming cannot be accurately found during actual machining. Therefore, it is only necessary to drill holes close to the theoretical hole position to ensure consistency within the same batch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is an overall three-dimensional Figure 1 ;

[0017] Figure 2 The utility model is an overall three-dimensional Figure 2 ;

[0018] Figure 3 This is an overall side view of the utility model;

[0019] Figure 4 This is an enlarged view of the circumferential precise positioning of the utility model. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 and 2The tooth palm three-point positioning hole processing device shown includes:

[0022] The workbench 1 is placed horizontally as an operating platform, and a linear slide 5 is provided on the workbench 1 .

[0023] A clamping device is fixed on the workbench 1 to clamp the journal 3 of the tooth palm 2 with the back of the palm facing upward;

[0024] The clamping device includes a chuck base 6, a chuck 7 and a claw 8. The chuck 7 is placed on the chuck base 6. The chuck base 6 is fixed in the linear slide groove 5 by screws. The claw 8 is placed on the chuck 7 to clamp the shaft neck 3. The chuck and the claw are both relatively mature clamping tools in the prior art. The upper surface of the chuck base 6 is inclined. After the shaft neck 3 is clamped by the inclination angle, the surface intersection line 9 on the inner side of the tooth palm 2 is parallel to the workbench 1, and in this embodiment, it is a 120° surface intersection line.

[0025] A limited support device can be slidably fixed on the workbench 1 to provide support below the pulp hole 4 at the tail of the tooth palm 2. The limited support device includes a limited base 10 and a circumferential rough positioning and a circumferential fine positioning.

[0026] The limiting base 10 is fixed in the linear slide groove 5 by means of screws, and the distance between the limiting base 10 and the clamping device can be adjusted by loosening the screws in accordance with the actual size of the tooth palm.

[0027] The circumferential coarse positioning includes a through hole opened on the side of the limit base 10, and an L-shaped limit piece 11 is arranged in the through hole. When the shaft neck 3 is clamped, the side limit position is adjusted by moving in the through hole to limit one side of the tail of the tooth palm 2. The limit base 10 is also provided with a first clamping screw 12 inserted from the end to clamp the L-shaped limit piece 11 to achieve circumferential coarse positioning. When the first piece is adjusted, the first clamping screw 12 is locked and no longer adjusted.

[0028] The circumferential fine positioning includes a strip groove 13 opened just above the limit base 10. After the shaft neck 3 of the tooth palm 2 is fixed, the inner wall of the pulp hole of the tooth palm 2 is directly opposite to the strip groove 13, and the circumferential rough positioning is achieved. Two wedge-shaped support blocks 14 are provided in the strip groove 13, which are inserted into the tooth palm 2 from one side of the strip groove 13, and the two outer edges 16 are simultaneously abutted against the inner wall of the pulp hole. The limit base 10 is also provided with a second clamping screw 15 inserted from the side to clamp the wedge-shaped support block 14.

[0029] Since the L-shaped stopper 11 contacts the non-finished surface of the tooth palm 2, there is a certain error in the position of each tooth palm slurry hole, and a single wedge-shaped support block cannot contact the tooth palm slurry hole at the same time, resulting in unstable support. When drilling, the tooth palm slurry hole and the support block are prone to sliding. Since the two wedge-shaped support blocks are independent of each other, the two outer edges can be in contact with the inner wall of the slurry hole at the same time. Figure 4 As shown, the force applied by the drill bit is just between the two contact points, which can prevent the palm from rotating.

[0030] To ensure self-locking, the angle of the upper bevel of the wedge-shaped support block 14 is 5-10°.

[0031] Steps:

[0032] 1. Clamp the journal with the jaws and check the axial positioning of the journal. Since the jaws can rotate around the journal, try to make the 120-degree intersection line of the jaws parallel to the workbench during clamping;

[0033] 2. Move the L-shaped limiter to make it contact with the side of the tooth palm, and tighten the first clamping screw;

[0034] 3. Select two wedge-shaped support blocks of appropriate height, place them into the strip groove of the limit base, gently push the support blocks until their edges touch the tooth palm slurry holes at the same time, tighten the second clamping screw, and the positioning is completed.

Claims

1. A tooth palm three-point positioning hole processing device, characterized in that: include: Workbench (1); A clamping device is fixed on the workbench (1) to clamp the shaft neck (3) of the tooth palm (2) with the back of the palm facing upwards; A limited position support device can be slidably fixed on the workbench (1) to provide support below the pulp hole (4) at the tail of the tooth palm (2), wherein the limited position support device includes circumferential rough positioning and circumferential fine positioning.

2. The tooth palm three-point positioning hole processing device according to claim 1 is characterized in that: The workbench (1) is provided with a linear slide groove (5), the clamping device is fixed in the linear slide groove (5) by means of screws, the limit support device is fixed in the linear slide groove (5) by means of screws, and the distance between the limit support device and the clamping device can be adjusted by loosening the screws.

3. The tooth palm three-point positioning hole processing device according to claim 1 is characterized in that: The clamping device comprises a chuck base (6), a chuck (7) and a clamping claw (8); the chuck (7) is placed on the chuck base (6), and the clamping claw (8) is placed on the chuck (7) to clamp the shaft neck (3); the upper surface of the chuck base (6) is inclined, and after the shaft neck (3) is clamped by the inclined angle, the surface intersection line (9) on the inner side of the tooth palm (2) is parallel to the workbench (1).

4. The tooth palm three-point positioning hole processing device according to claim 1 is characterized in that: The position limiting support device comprises a position limiting base (10) and a circumferential rough positioning device and a circumferential fine positioning device.

5. The tooth palm three-point positioning hole processing device according to claim 4 is characterized in that: The circumferential coarse positioning includes a through hole opened on the side of the limit base (10), and an L-shaped limit piece (11) is arranged in the through hole. When the shaft neck (3) is clamped, the side limit position is adjusted by moving in the through hole to limit one side of the tail of the tooth palm (2). The limit base (10) is also provided with a first clamping screw (12) inserted from the end to clamp the L-shaped limit piece (11), thereby achieving circumferential coarse positioning.

6. The tooth palm three-point positioning hole processing device according to claim 4, characterized in that: The circumferential fine positioning includes a strip groove (13) opened just above the limiting base (10). After the shaft neck (3) of the tooth palm (2) is fixed, the inner wall of the pulp hole of the tooth palm (2) is directly opposite to the strip groove (13), and the circumferential rough positioning is achieved. Two wedge-shaped support blocks (14) are arranged in the strip groove (13), which are inserted into the tooth palm (2) from one side of the strip groove (13), and the two outer edges (16) are simultaneously abutted against the inner wall of the pulp hole. The limiting base (10) is also provided with a second clamping screw (15) inserted from the side to clamp the wedge-shaped support block (14).

7. The tooth palm three-point positioning hole processing device according to claim 6, characterized in that: The wedge-shaped upper bevel angle of the wedge-shaped support block (14) is 5-10°.

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