Clamping device for fixing semi-finished products of reed parts

Abstract

The invention provides a clamping device for fixing a semi-finished product of a reed part, which comprises a circular plate, an adapter, an outer circle protective sleeve and a puller screw, the adapter is connected to one side of the circular plate and is provided with a clamping groove, the clamping groove is provided with a first groove wall and a second groove wall, the first groove wall is provided with a positioning hole, the second groove wall is provided with a threaded hole, and the outer circle protective sleeve is connected with the puller screw. The inner wall of the positioning hole is in clearance fit with the excircle of the first shaft section; the outer circle protection sleeve comprises a cylinder and a cylinder bottom, and the cylinder bottom is provided with a center hole. The inner diameter of the cylinder is larger than the diameter of the third shaft section and smaller than the diameter of the second shaft section. The jacking screws are used for being screwed into the threaded holes and jacking the outer circle protection sleeve so that the semi-finished product can be fixed in the clamp. According to the clamping device designed by the invention, semi-finished products of reed parts can be quickly clamped, the operation is simple, and the machining efficiency is improved by more than 25%; and meanwhile, the problem that wire penetrating holes of reed type parts machined through a traditional clamping tool are asymmetric is solved, the quality is stable, and the percent of pass is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical component processing, and in particular relates to a clamping device for fixing semi-finished products of spring-like parts. Background Art

[0002] A reed-like part with stepped shafts at both ends and four evenly spaced reeds in the middle, such as Figure 2 As shown, the thickness consistency of the reed is required to be within 0.003mm. The reed parts are composed of Figure 1 The semi-finished reed parts shown are processed. The reeds need to be formed by slow wire cutting. Before cutting, wire holes need to be drilled. There is a set of wire holes in each of the two vertical directions. Since the spacing between the reeds is only 0.9mm and the reeds have high precision requirements, the precision of the wire holes is also required to be high. If the symmetry of the two sets of wire holes is poor or the outlet is tilted, it will cause the wire holes to remain in the part of the reed, causing the parts to be scrapped. The outer circle of the step shaft at the left end and the step end face of the semi-finished reed parts are the positioning references when drilling. The outer circle of the step shaft at the right end has threads, and the end face of the step shaft at the right end has a center hole.

[0003] Currently, if Figure 3 As shown, this semi-finished reed part is fixed by a split fixture composed of 14 parts. When in use, the semi-finished reed part is loaded into the positioning sleeve, and after the center hole on the right end of the semi-finished reed part is tightened with a top tip, the top tip is fixed by tightening the cylindrical part of the top tip with a knurled screw, and then clamped to the positioning shaft and fixed with a set screw, and the positioning shaft is fixed on the support with a positioning pin, and the first group of center holes are drilled; after the first group of center holes are processed, the positioning pin is pulled out, the positioning shaft is rotated 90°, and the second group of center holes are processed on the semi-finished reed part, and the drill bit is replaced to drill two second pairs of holes; then, the positioning pin is pulled out, and the positioning shaft is rotated 90° in the opposite direction to the first group of center holes, and the two first pairs of holes are processed, and then disassembled. The semi-finished products of reed parts are clamped using the above-mentioned split fixture, which requires a split fixture composed of 14 parts and 18 steps to complete the processing of the threading holes. The operation is cumbersome and the production efficiency is low. After the positioning shaft rotates, the center of the second set of threading holes will be offset, which can easily cause the two sets of threading holes to be asymmetrical, resulting in the scrapping of reed parts. At the same time, the required reed parts are difficult to manufacture, with large cumulative errors and low precision. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art of complicated clamping operation, low production efficiency and easy scrapping of parts during drilling of leaf spring parts, and to provide a clamping device for fixing semi-finished products of leaf spring parts.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A clamping device for fixing a semi-finished product of a leaf spring type part is provided. The semi-finished product of the leaf spring type part is a stepped shaft having a first shaft section, a second shaft section and a third shaft section, and the diameter of the second shaft section is larger than the diameters of the first shaft section and the third shaft section. The clamping device is used to clamp the semi-finished product so that the clamping device equipped with the semi-finished product can easily process a first pair of holes and a second pair of holes on the second shaft section. The first pair of holes and the second pair of holes are both distributed along the circumference of the second shaft section, and the included angle between the first pair of holes and the second pair of holes along the circumference of the second shaft section is 90°. The clamping device comprises: a circular plate, an adapter, an outer cylindrical protective sleeve and a tightening screw. The adapter is connected to one side of the circular plate and has a clamping groove. The groove wall close to the circular plate is the first groove wall, and the groove wall of the clamping groove away from the circular plate is the second groove wall. Both the first groove wall and the second groove wall are parallel to the side of the circular plate. A positioning hole is provided on the first groove wall, and the central axis of the positioning hole is collinear with the central axis of the circular plate; a threaded hole is provided on the second groove wall, and the central axis of the threaded hole is collinear with the central axis of the circular plate; the inner wall of the positioning hole is clearance-matched with the outer circle of the first shaft segment; the outer circle protective sleeve includes a cylinder, and a cylinder bottom arranged at one end of the cylinder, and the cylinder bottom has a top hole; the inner diameter of the cylinder is larger than the diameter of the third shaft segment and smaller than the diameter of the second shaft segment; the tightening screw is used to screw into the threaded hole and tighten the outer circle protective sleeve to fix the semi-finished product on the clamping device.

[0007] Furthermore, the adapter has a first plane and a second plane parallel to the central axis of the circular plate, and the first plane and the second plane are perpendicular to each other.

[0008] Furthermore, the clamping groove is an oblique groove which forms an angle of 45° with the first plane.

[0009] Furthermore, the head of the tightening screw has a conical head; the side of the top hole facing the tightening screw is a conical countersunk hole matching the conical head.

[0010] Furthermore, the perpendicularity between the end surface of the first groove wall and the positioning hole is 0.004-0.006 mm.

[0011] Furthermore, the circular plate and the adapter are integrally formed.

[0012] Furthermore, the clearance between the inner diameter of the cylinder and the outer diameter of the third shaft segment is φ0.1 to φ0.3 mm; and the length of the cylinder is 1 to 2 mm longer than the length of the third shaft segment.

[0013] Furthermore, the depth of the positioning hole is greater than the length of the first shaft segment.

[0014] Furthermore, the adapter has an arcuate surface, one side of which is connected to the first plane and the other side of which is connected to the second plane. The first plane, the second plane and the arcuate surface constitute a column with a right-angled sector-shaped cross section.

[0015] Furthermore, an annular groove is provided on the other side of the circular plate; the clamping device is clamped on the rotating table through the annular groove.

[0016] The advantages of the present invention are:

[0017] The clamping device designed by the present invention has a positioning hole colinear with the central axis of the circular plate on the first groove wall of the adapter, and a threaded hole on the second groove wall; the first shaft section of the semi-finished reed parts extends into the positioning hole, and an outer circle protective sleeve is sleeved on the third shaft section, and the top screw is screwed into the threaded hole, so that the semi-finished reed parts can be accurately fixed on the clamping device. At this time, the semi-finished reed parts are punched, and the first pair of holes and the second pair of holes distributed along the circumference of the second shaft section and with an angle of 90° can be processed in the second shaft section by controlling the rotation of the circular plate. The semi-finished products can be clamped quickly by the clamping device, and the operation is simple, which improves the processing efficiency by more than 25%; at the same time, the problem of asymmetric threading holes of the semi-finished products 500 processed by traditional clamping tools is solved, the quality is stable, and the qualified rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present invention will become more readily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and in which some features are exaggerated or minimized to show details of particular components:

[0019] Figure 1 Schematic diagram of the semi-finished structure of the reed parts in the embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the reed parts of the present invention;

[0021] Figure 3 It is a schematic diagram of a fixture for semi-finished reed parts of the prior art of the present invention;

[0022] Figure 4 is a schematic structural diagram of a clamping device in an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a transition piece in an embodiment of the present invention;

[0024] Figure 6 is a cross-sectional view of a clamping device according to an embodiment of the present invention;

[0025] Figure 7 yes Figure 6 Enlarged view of point C;

[0026] Figure 8 yes Figure 6 AA view;

[0027] Fig. 9is a schematic structural diagram of an adapter and a clamping groove in an embodiment of the present invention;

[0028] Fig.10 yes Fig. 9 BB direction view;

[0029] Fig.11 It is a schematic structural diagram of an outer circular protective sleeve in an embodiment of the present invention;

[0030] Fig.12 It is a schematic diagram of the structure of the tightening screw in an embodiment of the present invention.

[0031] In the figure: 100-circular plate; 200-adapter; 210-clamping groove; 220-first groove wall; 221-positioning hole; 230-second groove wall; 231-threaded hole; 300-external cylindrical protective sleeve; 310-cylinder; 320-cylinder bottom; 321-top hole; 400-tightening screw; 500-semi-finished product; 510-first shaft section; 520-second shaft section; 530-third shaft section. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0033] A clamping device for fixing semi-finished products of reed parts, such as Figure 1 As shown, the semi-finished reed-type part 500 is a stepped shaft having a first shaft segment 510, a second shaft segment 520 and a third shaft segment 530, and the diameter of the second shaft segment 520 is larger than the diameters of the first shaft segment 510 and the third shaft segment 530. The clamping device is used to clamp the semi-finished product 500 so that the clamping device with the semi-finished product 500 can facilitate processing of the first pair of holes and the second pair of holes on the second shaft segment 520. The first pair of holes and the second pair of holes are distributed along the circumference of the second shaft segment 520, and the angle between the first pair of holes and the second pair of holes along the circumference of the second shaft segment 520 is 90°.

[0034] like Figure 4 As shown, the clamping device is an integral structure, including: a circular plate 100, an adapter 200, an outer circular protective sleeve 300, and a tightening screw 400.

[0035] like Figure 5 , 9As shown in 10, the adapter 200 is connected to one side of the circular plate 100 and has a clamping groove 210. The groove wall of the clamping groove 210 close to the circular plate 100 is the first groove wall 220, and the groove wall of the clamping groove 210 away from the circular plate 100 is the second groove wall 230. The first groove wall 220 and the second groove wall 230 are parallel to the side of the circular plate 100. The first groove wall 220 is provided with a positioning hole 221, and the central axis of the positioning hole 221 is collinear with the central axis of the circular plate 100; the second groove wall 230 is provided with a threaded hole 231, and the central axis of the threaded hole 231 is collinear with the central axis of the circular plate 100; the inner wall of the positioning hole 221 is matched with the outer circle of the first shaft section 510, and a sliding fit is required. And the coaxiality of the threaded hole 231 and the positioning hole 221 is φ0.01mm. Tool grinding is used to ensure that the verticality between the end surface of the first groove wall 220 and the positioning hole 221 is 0.005 mm, thereby ensuring the accuracy of the semi-finished product 500 during processing.

[0036] In this embodiment, the depth of the positioning hole 221 is greater than the length of the first shaft section 510. This allows the semi-finished product 500 to be vertically mounted in the clamping groove 210, effectively preventing the first pair of holes and the second pair of holes from being offset when being processed. The adapter 200 is formed as a whole in one process.

[0037] like Figure 6 , 7 As shown in FIG. 11 , the outer cylindrical protective sleeve 300 includes a cylinder 310 and a cylinder bottom 320 disposed at one end of the cylinder 310, and the cylinder bottom 320 has a top hole 321; the inner diameter of the cylinder 310 is larger than the diameter of the third shaft segment 530 and smaller than the diameter of the second shaft segment 520. The outer cylindrical protective sleeve 300 can be sleeved on the third shaft segment 530 and abut against the end surface of the second shaft segment 520. The outer cylindrical protective sleeve 300 can protect the threads on the third shaft segment 530.

[0038] like Figure 6 , 7 As shown in FIG. 12 , the tightening screw 400 is used to screw into the threaded hole 231 to tighten the outer cylindrical protective cover 300 so that the semi-finished product 500 is fixed in the clamp.

[0039] In this embodiment, the clamping device is first installed on the universal rotating table. The universal rotating table is an accessory of the machine tool, which can drive the clamping device to rotate accurately to the punching angle. The specific operation of installing the semi-finished reed parts 500 into the clamping device is as follows: since the first groove wall 220 of the adapter 200 is provided with a positioning hole 221 that is colinear with the central axis of the circular plate 100, and the second groove wall 230 is provided with a threaded hole 231; the first shaft section 510 of the semi-finished reed parts 500 extends into the positioning hole 221, and the outer circle protective sleeve 300 is sleeved on the third shaft section 530, and the threaded hole 231 is screwed into the tightening screw 400, so that the semi-finished reed parts 500 can be accurately fixed on the clamping device. At this time, the semi-finished reed parts 500 are fixed, and by controlling the rotation of the circular plate 100, the first pair of holes and the second pair of holes distributed along the circumference of the second shaft section 520 and with an angle of 90° can be processed on the second shaft section 520. Then another semi-finished reed part 500 can be replaced for processing again. The clamping device can quickly clamp the semi-finished product 500, and the operation is simple, which improves the processing efficiency by more than 25%. At the same time, it solves the problem of asymmetric threading holes of the semi-finished product 500 processed by traditional clamping tools, and the quality is stable, which improves the qualified rate of parts.

[0040] In this embodiment, Figure 7 As shown, the clearance between the inner diameter of the cylinder 310 and the outer circle of the third shaft segment is φ0.2mm; the length of the cylinder 310 is 1-2mm longer than the length of the third shaft segment 530. The head of the tightening screw 400 tightens the outer circle protective sleeve 300 without contacting the semi-finished product 500. If it directly hits the end face center hole of the third shaft segment 530, it will cause the outer thread of the third shaft segment 530 to deform, making it impossible to pass the thread ring gauge. The verticality of the top hole 321 and the end face of the cylinder 310 is 0.01mm. The tightening screw 400 can be vertically inserted into the outer circle protective sleeve 300, ensuring that the tightening screw 400, the outer circle protective sleeve 300 and the semi-finished product 500 are on the same axis, improving the accuracy of the first pair of holes and the second pair of holes, and no offset occurs.

[0041] like Fig.12 As shown, the head of the top screw 400 has a conical head; Fig.11 As shown, the side of the top hole 321 facing the tightening screw 400 is a conical countersunk hole matching the conical head, and the conical countersunk hole is connected to the cylinder 310. This allows the tightening screw 400 to automatically adjust in the conical countersunk hole and vertically push into the conical countersunk hole. The cone tip angle is 60°, and the coaxiality with the external thread is φ0.01mm.

[0042] The other end of the tightening screw 400 is provided with a hexagonal hole to facilitate the rotation of the tightening screw 400.

[0043] In this embodiment, Fig. 9 ,10 As shown, the adapter 200 has a first plane and a second plane parallel to the central axis of the circular plate 100, and the first plane and the second plane are perpendicular to each other. Providing such two perpendicular first and second planes can reduce the height of the drill chuck, reduce the exposed length of the drill bit when clamped, increase the strength of the drill bit, and make drilling more accurate. At the same time, by placing a level on the two planes, it is also possible to check whether the rotation angle during drilling is accurately 90°, and the positions of the two groups of first pairs of holes and second pairs of holes can be further determined. Among them, the adapter 200 has an arc-shaped surface, one side of which is connected to the first plane and the other side of which is connected to the second plane. The first plane, the second plane and the arc-shaped surface constitute a cylinder with a right-angled sector cross section.

[0044] In this embodiment, Figure 5 , 6 As shown in FIG. 8 , the clamping groove 210 is an inclined groove with an angle of 45° with the first plane. The length of the clamping groove 210 is about 5 mm greater than the semi-finished product 500, which is convenient for clamping the semi-finished product 500. At the same time, the slag generated by machining the first pair of holes and the second pair of holes can also slide down from the inclined groove without causing accumulation.

[0045] In one embodiment, the circular plate 100 and the adapter 200 are integrally formed.

[0046] In one embodiment, an annular groove is further provided on the other side of the circular plate 100; the clamping device is clamped on the universal rotary table of the machine tool through the annular groove. During installation, the positioning hole 221 of the clamping device needs to be aligned to be concentric with the rotary table. By using the universal rotary table, the adapter 200 can be rotated to perform drilling in two directions.

[0047] Using the clamping device designed in this embodiment, the third shaft section of the semi-finished product 500 is installed with the outer circle protective cover 300, and then the first shaft section 510 is installed in the positioning hole 221, and the right end of the jacking screw 400 is screwed into the threaded hole 231, and pushed into the top hole 321 of the outer circle protective cover 300, and then the first group of center holes are drilled, the circular plate 100 is rotated 90°, and the second group of center holes is drilled, and the drill bit is replaced to drill the second pair of holes, and the circular plate 100 is rotated 90° in the opposite direction, and the first pair of holes is drilled again, and the jacking screw 400 is loosened, and the semi-finished product 500 can be removed. The processing of one semi-finished product 500 only requires a few simple steps. The operation is simplified, the quality is stable, and the production efficiency is increased by about 25%, and the original 20 hours / batch (60 pieces) is now 15 hours / batch (60 pieces).

[0048] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A clamping device for fixing a semi-finished product of a leaf spring part, wherein the semi-finished product (500) of the leaf spring part is a stepped shaft having a first shaft section (510), a second shaft section (520) and a third shaft section (530), and the diameter of the second shaft section (520) is larger than the diameters of the first shaft section (510) and the third shaft section (530), and the clamping device is used to clamp the semi-finished product (500) so that the clamping device with the semi-finished product (500) installed can easily process a first pair of holes and a second pair of holes on the second shaft section (520), the first pair of holes and the second pair of holes are distributed along the circumference of the second shaft section (520), and the angle between the first pair of holes and the second pair of holes along the circumference of the second shaft section (520) is 90°; characterized in that The clamping device comprises: Circular plate (100); The adapter (200) is connected to one side of the circular plate (100) and has a clamping groove (210). The groove wall of the clamping groove (210) close to the circular plate (100) is a first groove wall (220), and the groove wall of the clamping groove (210) away from the circular plate (100) is a second groove wall (230). The first groove wall (220) and the second groove wall (230) are both parallel to the side of the circular plate (100). A positioning hole (221) is provided on the first groove wall (220), and the central axis of the positioning hole (221) is collinear with the central axis of the circular plate (100); a threaded hole (231) is provided on the second groove wall (230), and the central axis of the threaded hole (231) is collinear with the central axis of the circular plate (100); the inner wall of the positioning hole (221) is clearance-matched with the outer circle of the first shaft segment (510); The outer cylindrical protective sleeve (300) comprises a cylinder (310) and a cylinder bottom (320) arranged at one end of the cylinder (310), wherein the cylinder bottom (320) has a top hole (321); the inner diameter of the cylinder (310) is greater than the diameter of the third shaft segment (530) and smaller than the diameter of the second shaft segment (520); A tightening screw (400) is used to be screwed into the threaded hole (231) to tighten the outer cylindrical protective sleeve (300) so as to fix the semi-finished product (500) on the clamping device.

2. The clamping device according to claim 1, characterized in that: The adapter (200) has a first plane and a second plane parallel to the central axis of the circular plate (100), and the first plane and the second plane are perpendicular to each other.

3. The clamping device according to claim 2, characterized in that: The clamping groove (210) is an oblique groove that forms an angle of 45° with the first plane.

4. The clamping device according to claim 1, characterized in that: The head of the tightening screw (400) has a conical head; The side of the top hole (321) facing the tightening screw (400) is a conical countersunk hole matching the conical head.

5. The clamping device according to claim 1, characterized in that: The verticality between the end surface of the first groove wall (220) and the positioning hole (221) is 0.004-0.006 mm.

6. The clamping device according to claim 1, characterized in that: The circular plate (100) and the adapter (200) are integrally formed.

7. The clamping device according to claim 1, characterized in that: The matching clearance between the inner diameter of the cylinder (310) and the outer diameter of the third shaft segment (530) is φ0.1-φ0.3 mm; The length of the cylinder (310) is 1 to 2 mm longer than the length of the third shaft segment (530).

8. The clamping device according to claim 1, characterized in that: The depth of the positioning hole (221) is greater than the length of the first shaft section (510).

9. The clamping device according to claim 2, characterized in that: The adapter (200) has an arcuate surface, one side of which is connected to the first plane and the other side of which is connected to the second plane; the first plane, the second plane and the arcuate surface form a column with a right-angled sector cross section.

10. The clamping device according to claim 1, characterized in that: The other side of the circular plate (100) is also provided with an annular groove; the clamping device is clamped on the rotating table through the annular groove.

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