Lathe clamping jig for circular ring thin-wall parts

Abstract

The utility model relates to the technical field of rotary body machining, in particular to a lathe clamping jig for circular ring thin-wall parts, which comprises a base, a powerful chuck, a foundation plate, three groups of movable sliding blocks and three groups of bidirectional clamping jaws, the powerful chuck is provided with three adjusting grooves in the radial direction, and the included angle between every two adjusting grooves is 120 degrees. Three avoiding through grooves are formed in the foundation plate in the radial direction, and the included angle between every two avoiding through grooves is 120 degrees; the base is installed on a lathe, the powerful chuck is installed on the base, and the foundation plate is installed on the powerful chuck. The two-way clamping jaw is fixed on the movable sliding block; the movable sliding block is synchronously centripetally or centrifugally adjusted in the adjusting groove along the radial direction; and the side wall of the circular thin-wall part is concentrically clamped by three groups of bidirectional clamping jaws. According to the three-jaw chuck, two different clamping modes of outer clamping and inner supporting are achieved for circular ring thin-wall parts through the self-centering function of the three-jaw chuck, it is guaranteed that the inner side and the outer side of the same portion of a workpiece are clamped tightly, stress is uniform, part deformation caused by single-side stress is avoided, the three-jaw chuck is suitable for parts in various size ranges, clamping operation is convenient, and the machining efficiency and the percent of pass are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary body processing, in particular to a lathe clamping fixture for annular thin-walled parts. Background Art

[0002] The existing clamping method in the process of rotating body processing generally uses contoured clamps or repairs the clamps on the machine before processing to clamp the parts. The disadvantages are high technical cost, non-universal fixtures and low work efficiency.

[0003] Circular ring parts are clamped using tools such as ordinary chucks, but the disadvantage is that due to the thin wall of the parts and poor rigidity, one-sided clamping can easily cause the parts to deform due to high pressure. The size and shape and position tolerances after processing cannot meet the design requirements, affecting product quality.

[0004] Thin-walled parts are difficult to process in mechanical processing because they have weak strength and poor rigidity, generate vibration during processing, are easily deformed after processing, the processing quality cannot be guaranteed, and the product qualification rate is extremely low.

[0005] In production and processing, traditional clamping methods include claws, pressure plates, and mandrel expansion sleeves. The large clamping force of the claws causes deformation of the parts, and the small clamping force cannot meet the requirements of safe production; the pressure plate method is limited by factors such as the part structure or the blank; mandrel expansion sleeves are usually suitable for small diameter parts, and the cost of products with large diameters is extremely high. The prerequisite for using mandrel expansion sleeves is that the clamping positioning part must first meet the roundness requirements to ensure that the parts are qualified after processing. Utility Model Content

[0006] In order to solve the above technical problems, the utility model discloses a lathe clamping fixture for circular thin-walled parts.

[0007] The specific technical solutions adopted in this utility model are as follows:

[0008] A lathe clamping fixture for circular thin-walled parts includes a base, a strong chuck, a base plate, three groups of movable slides and three groups of two-way clamping jaws; the strong chuck has a circular hole in the center, and three adjustment slots with an angle of 120° to each other are opened radially; the base plate has three avoidance slots with an angle of 120° to each other radially; the strong chuck is installed on the base, and the base plate is installed on the strong chuck; the two-way clamping jaws are fixed on the movable slide, and the movable slide is synchronously adjusted radially in the adjustment slot toward the centripetal or centrifugal direction; the side wall of the circular thin-walled part is concentrically clamped by the three groups of two-way clamping jaws; the base is installed on the lathe.

[0009] Furthermore, the bidirectional claw includes a positioning claw and a movable claw; the positioning claw includes an adjusting block, a bottom groove is provided in the middle of the bottom of the adjusting block along the length direction, a side groove is provided on each side along the length direction, and a positioning boss B is provided at the bottom along the width direction; a protruding positioning block is provided on the upper part of one end of the adjusting block, a countersunk hole E is provided vertically on the positioning block, and an adjusting hole A is provided horizontally; a sliding groove is provided at the bottom of the movable claw, and the sliding groove slides in coordination with the top surface of the adjusting block and the shape of the side groove, and an adjusting hole B is provided horizontally above the sliding groove, and an adjusting bolt is screwed into the adjusting hole B and the adjusting hole A to adjust the distance between the movable claw and the positioning claw.

[0010] Furthermore, the opposite end faces of the positioning claw and the movable claw are respectively processed into convex arc-shaped clamping jaws A and B, which jointly clamp the inner and outer side walls of the part.

[0011] Furthermore, six countersunk holes B and six threaded holes A are provided on the powerful chuck, six countersunk holes A are provided on the base, and six countersunk holes C are provided on the base plate; the countersunk holes A and the countersunk holes B are connected from bottom to top by locking bolts A, and the countersunk holes C and the threaded holes A are connected from top to bottom by locking bolts B.

[0012] Furthermore, the top surface of the movable slider is a protruding positioning boss A along the length direction, two positioning grooves are provided in the width direction of the eye, and four groups of threaded holes B are provided on the top surface; after the positioning groove is engaged with a positioning boss B, two locking bolts C are used to lock the countersunk hole E and the countersunk hole D of the positioning claw with the threaded hole B of the movable slider respectively.

[0013] Furthermore, the bottom surface of the movable slider is processed into a lead screw, and three groups of diameter adjustment holes are provided on the side of the powerful chuck, and the diameter adjustment screw is screwed in; an annular groove is provided inside the powerful chuck, and a spiral disk is built in. The spiral disk is concentric with the powerful chuck and cooperates with the thread of the diameter adjustment screw. The rotation of the diameter adjustment screw drives the spiral disk to rotate in the annular groove, and a part of the spiral disk is exposed from the thread groove, cooperating with the lead screw to drive the movable slider to slide centripetally or centrifugally.

[0014] Furthermore, the bidirectional clamping jaws can be rotated 180° for installation, and can be installed with internal support or external clamping according to the actual clamping requirements of the parts.

[0015] Furthermore, the base, base plate and bidirectional clamping claw are made of CrWMn tool steel; the base and base plate are quenched as a whole, and the two end surfaces are ground; the bidirectional clamping claw is quenched as a whole, and the positioning boss and positioning groove are ground.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] 1. This utility model provides internal and external double-side clamping technology for thin-walled circular parts, which can prevent deformation of parts after processing due to clamping force. The base plate ensures that the bottom surface of the part is fully in contact with the surface, increasing the rigidity of the part.

[0018] 2. This utility model utilizes the self-centering function of the three-jaw chuck, mounting the bidirectional jaws on the three movable sliders of the powerful chuck. This allows for two different clamping modes: external clamping and internal support, with quick-change functionality and adjustable clamping range. The bidirectional jaw contact surfaces are manufactured with convex arc-shaped jaws A and B, eliminating the need to re-calibrate the jaws for each part. During use, the jaws are positioned to center the workpiece, then the movable jaws are used to clamp the part. This ensures that both sides of the workpiece are clamped evenly, preventing deformation caused by unilateral force.

[0019] 3. The clamping fixture of this utility model is suitable for parts of various sizes. The clamping operation is convenient, the processing efficiency is improved, the design requirements are met after processing, and the qualified rate of one-time manufacturing is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the clamping fixture of the present utility model;

[0021] Figure 2 This is a structural diagram of the base of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the powerful chuck of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the spiral disk inside the powerful chuck of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the foundation plate of the utility model;

[0025] Figure 6 This is a structural diagram of the positioning claw of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the mobile compound claw of the utility model;

[0027] Figure 8 This is a schematic structural diagram of the bidirectional claw of the utility model;

[0028] Figure 9 for Figure 8 longitudinal section of

[0029] Figure 10 for Figure 8 A top view of

[0030] Figure 11 This is a structural diagram of the movable slider of the utility model;

[0031] Figure 12 This is a schematic diagram of a clamping fixture for clamping parts in the utility model;

[0032] Figure 13 for Figure 12 A top view of

[0033] Figure 14 for Figure 13 Cross-sectional view of section AA;

[0034] In the figure, 1. base; 11. countersunk hole A; 2. strong chuck; 21. threaded hole A; 22. countersunk hole B; 23. adjusting groove; 24. spiral disk; 3. base plate; 31. avoidance groove; 32. countersunk hole C; 4. movable slider; 41. positioning boss A; 42. positioning groove; 43. threaded hole B; 44. screw; 5. positioning claw; 51. adjusting block; 511. countersunk hole D; 512. bottom groove; 513. side groove; 514. positioning boss B; 52. positioning block; 521. countersunk hole E; 522. adjusting hole A; 523. clamping jaw A; 6. movable double claw; 61. slide groove; 62. adjusting hole B; 63. clamping jaw B; 71. adjusting bolt; 72. locking bolt A; 73. locking bolt B; 74. locking bolt C; 8. parts; 9. diameter-adjusting screw. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the three-dimensional structure of the clamping fixture of the utility model. Figure 2 This is a structural diagram of the base of the utility model. Figure 3 This is a structural diagram of the powerful chuck of the utility model. Figure 4 This is a schematic diagram of the structure of the internal spiral disk of the powerful chuck of the utility model. Figure 5 This is a schematic diagram of the structure of the foundation plate of the utility model. Figure 6 This is a structural diagram of the positioning claw of the utility model. Figure 7 This is a schematic diagram of the structure of the mobile compound claw of the utility model. Figure 8 This is a schematic diagram of the structure of the bidirectional claw of the utility model. Figure 9 for Figure 8 A longitudinal section of Figure 10 for Figure 8 A top view of Figure 11 This is a structural diagram of the movable slider of the utility model. Figure 12 This is a schematic diagram of the clamping fixture of the utility model for clamping parts. Figure 13 for Figure 12 A top view of Figure 14 for Figure 13The sectional view of the middle AA section is shown in the figure: the utility model is a clamping fixture for circular thin-walled parts lathe, comprising a base 1, a powerful chuck 2, a base plate 3, three sets of movable slide blocks 4 and three sets of bidirectional claws; the powerful chuck 2 has a circular hole in the center, and three adjustment slots 23 are radially provided at 120° to each other; six countersunk holes B22 and six threaded holes A21 are provided on the powerful chuck 2, six countersunk holes A11 are provided on the base 1, and six countersunk holes C32 are provided on the base plate 3; the countersunk holes A11 and the countersunk holes B22 are connected from bottom to top by locking bolts A72, and the countersunk holes C32 and the threaded holes A21 are connected from top to bottom by locking bolts B73; three avoidance grooves 31 are radially provided at 120° to each other on the base plate 3; the base 1 is mounted on the lathe On the top, the strong chuck 2 is installed on the base 1, and the base plate 3 is installed on the strong chuck 2; the two-way clamping claw is fixed on the movable slider 4, and the movable slider 4 is radially synchronously adjusted centripetally or centrifugally in the adjusting groove 23. The bottom surface of the movable slider 4 is processed into a screw 44, and three groups of diameter adjustment holes are provided on the side of the strong chuck 2, and the diameter adjustment screw 9 is screwed into the inside; an annular groove is provided inside the strong chuck 2, and a spiral disk 24 is built in. The spiral disk 24 is concentric with the strong chuck 2 and cooperates with the thread of the diameter adjustment screw 9. The diameter adjustment screw 9 rotates to drive the spiral disk 24 to rotate in the annular groove, and a part of the spiral disk 24 is exposed from the thread groove 23, cooperating with the screw 44, driving the movable slider 4 to slide centrifugally or centrifugally; the side wall of the annular thin-walled part 8 is concentrically clamped by three groups of two-way clamping claws.

[0037] The bidirectional clamping jaws include a positioning jaw 5 and a movable jaw 6. The positioning jaw 5 includes an adjustment block 51, which has a bottom groove 512 defined in the middle of its bottom along its length, a side groove 513 defined on each side along its length, and a positioning boss B514 defined along its width. A protruding positioning block 52 is located at the top of one end of the adjustment block 51. The positioning block 52 has a vertical countersunk hole E521 and a horizontal adjustment hole A522. The movable jaw 6 has a sliding groove 61 defined at its bottom, which slidably mates with the top surface of the adjustment block 51 and the side groove 513. Above the sliding groove 61 is a horizontal adjustment hole B62, which is screwed into both hole B62 and hole A522 to adjust the distance between the movable jaw 6 and the positioning jaw 5. The opposing end surfaces of the positioning jaw 5 and the movable jaw 6 are machined into convex, arc-shaped clamping openings A523 and B63, respectively, which together clamp the inner and outer walls of the part 8.

[0038] The top surface of the movable slider 4 has a protruding positioning boss A41 along the length direction, two positioning grooves 42 are opened in the width direction of the eye, and four groups of threaded holes B43 are opened on the top surface; after the positioning groove 42 is engaged with a positioning boss B514, two locking bolts C74 are used to lock the countersunk hole E521 and the countersunk hole D511 of the positioning claw 5 with the threaded hole B of the movable slider 4 respectively.

[0039] The base 1, base plate 3 and bidirectional clamping claw are made of CrWMn tool steel; the base 1 and base plate 3 are quenched as a whole, and the two end surfaces are ground to ensure parallelism of 0.02mm and flatness of 0.01mm; the bidirectional clamping claw is quenched as a whole, and the positioning boss and positioning groove are ground to ensure dimensional accuracy and roughness of Ra0.4.

[0040] When in use, the bidirectional clamping jaws can be rotated 180° for installation, and can be adjusted and installed using internal support or external clamping according to the actual clamping requirements of the parts.

Claims

1. A lathe clamping fixture for thin-walled annular parts, characterized by: The invention comprises a base (1), a powerful chuck (2), a base plate (3), three groups of movable slide blocks (4) and three groups of bidirectional clamping jaws; the powerful chuck (2) has a circular hole at its center and three adjustment slots (23) with an angle of 120° to each other are provided in the radial direction; the base plate (3) has three avoidance slots (31) with an angle of 120° to each other are provided in the radial direction; the base (1) is mounted on a lathe, the powerful chuck (2) is mounted on the base (1), and the base plate (3) is mounted on the powerful chuck (2); the bidirectional clamping jaws are fixed on the movable slide block (4), and the movable slide block (4) is adjusted radially and synchronously in the adjustment slot (23) in a centripetal or centrifugal manner; and the side wall of the part (8) is concentrically clamped by the three groups of bidirectional clamping jaws.

2. The lathe clamping fixture for annular thin-walled parts according to claim 1 is characterized in that: The bidirectional claw comprises a positioning claw (5) and a movable claw (6); the positioning claw (5) comprises an adjusting block (51), a bottom groove (512) is provided in the middle of the bottom of the adjusting block (51) along the length direction, a side groove (513) is provided on each side along the length direction, and a positioning boss B (514) is provided on the bottom along the width direction; a protruding positioning block (52) is provided on the upper part of one end of the adjusting block (51), a countersunk hole E (521) is provided vertically on the positioning block (52), and an adjusting hole A (522) is provided horizontally; a sliding groove (61) is provided at the bottom of the movable claw (6), the sliding groove (61) is shaped to slide with the top surface of the adjusting block (51) and the side groove (513), an adjusting hole B (62) is provided horizontally above the sliding groove (61), and an adjusting bolt (71) is screwed into the adjusting hole B (62) and the adjusting hole A (522) to adjust the distance between the movable claw (6) and the positioning claw (5).

3. The lathe clamping fixture for annular thin-walled parts according to claim 2 is characterized in that: The opposite end faces of the positioning claw (5) and the movable claw (6) are respectively processed into convex arc-shaped clamping openings A (523) and clamping openings B (63), which jointly clamp the inner and outer side walls of the part (8).

4. The lathe clamping fixture for annular thin-walled parts according to claim 1 is characterized in that: The powerful chuck (2) is provided with six countersunk holes B (22) and six threaded holes A (21), the base (1) is provided with six countersunk holes A (11), and the base plate (3) is provided with six countersunk holes C (32); the countersunk holes A (11) and the countersunk holes B (22) are connected from bottom to top by a locking bolt A (72), and the countersunk holes C (32) and the threaded holes A (21) are connected from top to bottom by a locking bolt B (73).

5. The lathe clamping fixture for annular thin-walled parts according to claim 1 is characterized in that: The top surface of the movable slider (4) is provided with a protruding positioning boss A (41) along the length direction, two positioning grooves (42) are provided in the width direction of the eye, and four groups of threaded holes B (43) are provided on the top surface; after the positioning groove (42) is engaged with a positioning boss B (514), the countersunk hole E (521) and the countersunk hole D (511) of the positioning claw (5) are respectively locked with the threaded hole B (43) of the movable slider (4) by two locking bolts C (74).

6. The lathe clamping fixture for annular thin-walled parts according to claim 1 is characterized in that: The bottom surface of the movable slider (4) is processed into a lead screw (44), and three groups of diameter adjustment holes are provided on the side of the powerful chuck (2), and the diameter adjustment screw (9) is screwed into the inside; an annular groove is provided inside the powerful chuck (2), and a spiral disk (24) is built in. The spiral disk (24) is concentric with the powerful chuck (2) and cooperates with the thread of the diameter adjustment screw (9). The diameter adjustment screw (9) rotates to drive the spiral disk (24) to rotate in the annular groove, and a part of the spiral disk (24) is exposed from the thread groove and cooperates with the lead screw (44) to drive the movable slider (4) to slide centrifugally or centrifugally.

7. The lathe clamping fixture for annular thin-walled parts according to claim 1 is characterized in that: The bidirectional clamping claw can be installed by rotating 180 degrees, and can be installed by internal support or external clamping according to the actual clamping requirements of the part (8).

8. The lathe clamping fixture for annular thin-walled parts according to claim 1, characterized in that: The base (1), base plate (3) and bidirectional clamping claw are made of CrWMn tool steel; the base (1) and base plate (3) are quenched as a whole, and both end surfaces are ground; the bidirectional clamping claw is quenched as a whole, and the positioning boss and positioning groove (42) are ground.

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