Positioning device for screw machining

Abstract

A positioning device for screw machining comprises an equipment base, a driving seat, a tip tailstock and a tool rest table, a hydraulic chuck and a tip are correspondingly arranged on the opposite sides of the driving seat and the tip tailstock, a limiting mechanism is detachably installed on the side, facing a tool rest, of a positioning seat, and a threading tool is installed on the tool rest; the limiting mechanism comprises a center limiting block transversely arranged in the middle of the positioning seat and side limiting blocks symmetrically arranged above and below the center limiting block, the opposite sides of the side limiting blocks are machined to form inclined faces, universal ball strips are installed on the inclined faces and the front side face of the center limiting block, and the radius of an arc defined by balls on the three sets of universal ball strips is matched with the screw. According to the device, the positioning seats are installed on the opposite sides of the tool rest, the three sets of universal ball strips are arranged on the positioning seats, when the threading tool machines a screw groove in the screw, the surfaces of the balls make rolling contact with the circumferential face of the screw and form radial supporting, the friction force is reduced to the maximum extent while the screw is prevented from deforming, the overall stress of the screw is stable, and the service life of the screw is prolonged. The product quality is improved.

Description

Technical Field

[0001] The utility model relates to a positioning device for screw processing. Background Art

[0002] The screw needs to be slotted during the processing process. Generally, the two ends of the screw are positioned by a fixture, and then the screw is slotted using a special tool. During processing, the tool forms a radial force on the screw. When the length of the screw is long, the middle part of the screw is prone to deformation. In the existing processing process, a limit block is set on the opposite side of the tool. The surface of the screw relative to the other side of the tool is attached to the limit block. The surface of the screw rotates and moves horizontally relative to the limit block. There is static friction between the two, which can easily scratch the surface of the screw and affect product quality. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides a positioning device for screw processing.

[0004] To achieve the above-mentioned purpose, the utility model provides a positioning device for screw processing, comprising an equipment base, a driving seat fixedly arranged on the left part of the equipment base, a top and tail seat slidably arranged on the right part of the equipment base, and a tool holder platform slidably arranged in the middle part of the equipment base, the driving seat and the top and tail seat facing each other are provided with a hydraulic chuck and a top, a tool holder and a positioning seat are correspondingly installed on the front and back of the tool holder platform, a limiting mechanism can be detachably installed on the side of the positioning seat facing the tool holder, and a thread turning tool is installed on the facing side of the tool holder;

[0005] The limiting mechanism includes a central limiting block laterally arranged in the middle of the positioning seat and side limiting blocks symmetrically arranged above and below the central limiting block. The opposite sides of the side limiting blocks are processed to form inclined surfaces. Universal ball strips are installed on the inclined surfaces and the front side surfaces of the central limiting block. The arc radius formed by the balls on the three groups of universal ball strips matches the screw.

[0006] As a further improvement of the utility model, the balls are evenly arranged along the length direction of the universal ball strip, and the distance between adjacent balls is smaller than the pitch formed after the screw is processed.

[0007] As a further improvement of the present invention, the arc formed by the balls on the three groups of universal ball strips has an angle of less than 90°.

[0008] As a further improvement of the utility model, the positioning seat is vertically processed with waist-shaped grooves, and there are more than two groups of waist-shaped grooves. Locking bolts are installed in the waist-shaped grooves to connect the side limit blocks and the center limit blocks.

[0009] As a further improvement of the present invention, a second slide rail mechanism is provided on the front-to-rear direction of the tool holder platform, and the positioning seat and the tool holder are both slidably matched with the tool holder platform through the second slide rail mechanism.

[0010] As a further improvement of the utility model, a first slide rail mechanism is provided on the upper part of the equipment base in the horizontal direction, and the top and tail stock and the tool holder platform both form a sliding fit with the equipment base through the first slide rail mechanism.

[0011] The beneficial effects of the utility model are:

[0012] In the device, the left and right ends of the screw are positioned by a hydraulic chuck and a center, and a positioning seat is installed on the opposite side of the tool holder. Three sets of universal ball bars are arranged on the positioning seat. The balls on the three sets of universal ball bars are enclosed to form an arc structure that cooperates with the surface of the screw. When the thread turning tool processes the screw groove on the screw, the ball surface is in rolling contact with the circumferential surface of the screw and forms a radial support, which prevents the screw from deforming while minimizing friction. The overall force of the screw is stable, which prevents the surface of the screw from being scratched and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A top view of a positioning device for screw processing according to the utility model;

[0014] Figure 2 It is a side view of the tool rest 5;

[0015] Figure 3 It is a schematic diagram of the assembly structure of the positioning seat 7 and the limiting mechanism 8.

[0016] In the figure: 1. Equipment base; 2. Drive seat; 21. Hydraulic chuck; 3. First slide rail mechanism; 4. Screw; 5. Tool holder; 6. Tool holder; 61. Thread turning tool; 7. Positioning seat; 71. Waist groove; 8. Limiting mechanism; 81. Side limit block; 811. Inclined surface; 82. Center limit block; 83. Universal ball strip; 831. Ball; 9. Second slide rail mechanism; 10. Center tailstock; 101. Center. DETAILED DESCRIPTION

[0017] like Figure 1-3As shown, a positioning device for screw processing described in the utility model comprises an equipment base 1, a driving seat 2 fixedly arranged on the left part of the equipment base 1, a top and tail seat 10 slidably arranged on the right part of the equipment base 1, and a tool holder platform 5 slidably arranged in the middle part of the equipment base 1, a second slide rail mechanism 9 is arranged on the tool holder platform 5 along the front-to-back direction, and the positioning seat 7 and the tool holder 6 are both slidably matched with the tool holder platform 5 through the second slide rail mechanism 9, a first slide rail mechanism 3 is arranged on the upper part of the equipment base 1 along the horizontal direction, and the top and tail seat 10 and the tool holder platform 5 are both slidably matched with the equipment base 1 through the first slide rail mechanism 3, and the driving seat 2 and the top and tail seat 10 are correspondingly provided with a hydraulic chuck 21 and a top 101 on the opposite sides, and the tool holder 6 and the positioning seat 7 are correspondingly installed on the front and back of the tool holder platform 5, and the positioning seat 7 is detachably installed with a limiting mechanism 8 on the side facing the tool holder 6, and a thread turning tool 61 is installed on the opposite side of the tool holder 6;

[0018] The limiting mechanism 8 includes a central limiting block 82 laterally arranged in the middle of the positioning seat 7, and side limiting blocks 81 symmetrically arranged above and below the central limiting block 82. A waist-shaped groove 71 is vertically processed on the positioning seat 7. There are more than two groups of waist-shaped grooves 71. Locking bolts are installed in the waist-shaped grooves 71 to connect the side limiting blocks 81 and the central limiting block 82. The opposite side of the side limiting block 81 is processed to form an inclined surface 811. Universal ball strips 83 are installed on the inclined surface 811 and the front side of the central limiting block 82. The arc radius formed by the balls 831 on the three groups of universal ball strips 83 matches the screw 4. The arc degree formed by the balls 831 on the three groups of universal ball strips 83 is less than 90°. The balls 831 are evenly arranged along the length direction of the universal ball strips 83, and the distance between adjacent balls 831 is less than the pitch formed after the screw 4 is processed.

[0019] In the device, the left and right ends of the screw are positioned by a hydraulic chuck and a center, and a positioning seat is installed on the opposite side of the tool holder. Three sets of universal ball bars are arranged on the positioning seat. The balls on the three sets of universal ball bars are enclosed to form an arc structure that cooperates with the surface of the screw. When the thread turning tool processes the screw groove on the screw, the ball surface is in rolling contact with the circumferential surface of the screw and forms a radial support, which prevents the screw from deforming while minimizing friction. The overall force of the screw is stable, which prevents the surface of the screw from being scratched and improves product quality.

[0020] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings:

[0021] During operation, one end of the screw is clamped by the hydraulic chuck, and then the other end is tightened by the top on the top tailstock, and the position of the center limit block on the positioning seat is adjusted so that the center of the universal ball bar on the center limit block is flush with the center line of the screw, and the positioning seat slides along the second slide rail mechanism as a whole, and the ball surface on the universal ball bar is close to the surface of the screw, and then the position of the side limit block is adjusted so that the ball surface of the universal ball bar on the inclined surface of the side limit block is in contact with the surface of the screw; then the driving seat drives the hydraulic chuck and the screw to rotate, and the tool holder drives the thread turning tool to feed in the direction of the screw. At the same time, the tool holder drives the thread turning tool and the positioning seat to move horizontally as a whole (the tool holder is powered by a screw slider mechanism or a gear rack mechanism). The thread turning tool forms a screw groove on the surface of the screw. When the thread turning tool is working, the thread turning tool forms a radial thrust on the screw. The ball surfaces on the three sets of universal ball bars contact the circumferential surface of the screw and form a radial support, which can prevent the screw from deforming during processing. At the same time, there is rolling friction between the ball surface and the circumferential surface of the screw, and the friction is small, which will not scratch the surface of the screw, effectively ensuring product quality.

[0022] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A positioning device for screw processing, characterized in that: The invention comprises an equipment base (1), a driving seat (2) fixedly arranged on the left part of the equipment base (1), a top and tail seat (10) slidably arranged on the right part of the equipment base (1), and a tool holder platform (5) slidably arranged on the middle part of the equipment base (1); a hydraulic chuck (21) and a top (101) are correspondingly arranged on the opposite sides of the driving seat (2) and the top and tail seat (10); a tool holder (6) and a positioning seat (7) are correspondingly installed on the front and back of the tool holder platform (5); a limiting mechanism (8) is detachably installed on the side of the positioning seat (7) facing the tool holder (6); and a thread turning tool (61) is installed on the opposite side of the tool holder (6); The limiting mechanism (8) comprises a central limiting block (82) arranged transversely in the middle of the positioning seat (7), and side limiting blocks (81) symmetrically arranged above and below the central limiting block (82); the side of the side limiting blocks (81) facing each other is processed to form an inclined surface (811); universal ball strips (83) are installed on the inclined surface (811) and the front side surface of the central limiting block (82); the arc radius formed by the balls (831) on the three groups of universal ball strips (83) matches the screw rod (4).

2. A screw processing positioning device according to claim 1, characterized in that: The balls (831) are evenly arranged along the length direction of the universal ball bar (83), and the distance between adjacent balls (831) is smaller than the pitch formed after the screw rod (4) is processed.

3. A screw processing positioning device according to claim 1, characterized in that: The arc angle formed by the balls (831) on the three groups of universal ball strips (83) is less than 90°.

4. A screw processing positioning device according to claim 1, characterized in that: The positioning seat (7) is vertically processed with waist-shaped grooves (71), and the waist-shaped grooves (71) are provided with more than two groups. Locking bolts are installed in the waist-shaped grooves (71) and connect the side limit blocks (81) and the center limit blocks (82).

5. A screw processing positioning device according to claim 1, characterized in that: A second slide rail mechanism (9) is provided on the tool holder platform (5) along the front-rear direction, and the positioning seat (7) and the tool holder (6) are both slidably matched with the tool holder platform (5) through the second slide rail mechanism (9).

6. A screw processing positioning device according to claim 1, characterized in that: A first slide rail mechanism (3) is provided on the upper part of the equipment base (1) in the horizontal direction, and the top and tail stock (10) and the tool holder platform (5) are both slidably matched with the equipment base (1) through the first slide rail mechanism (3).

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