A special fixture for turning a special-shaped workpiece

Abstract

The utility model belongs to the field of fixture, relates to lathe processing, especially a special fixture for turning of special-shaped workpiece, including the cylindrical end, the one end of cylindrical end is connected with the clamping part, the clamping part includes the upper clamping end, the lower clamping end, the upper clamping end is installed with the upper locating block, the lower clamping end is installed with the lower locating block, is provided with the cavity that penetrates cylindrical end, clamping part along the cylindrical end axis direction, the cavity is slidably connected with the guide shaft for compressing special-shaped workpiece in horizontal direction. The utility model fixes special-shaped workpiece, and the utility model is easy to be clamped by three-jaw chuck, so that the lathe can process this special-shaped workpiece.

Description

Technical Field

[0001] This utility model belongs to the field of fixtures, and relates to lathe machining, and in particular to a special fixture for turning irregularly shaped workpieces. Background Technology

[0002] Common clamping devices on machine tools include three-jaw chucks and vises, primarily used to fix regularly shaped workpieces. However, for irregularly shaped workpieces, specialized clamping devices are required. This application relates to an irregularly shaped workpiece, as detailed in the attached drawings. A cavity is milled into the interior of this workpiece using a milling machine. Traditionally, this workpiece is machined using a vertical machining center, which has a long machining cycle and requires custom-made T-slot milling cutters. These cutters are prone to damage and their dimensions are inconsistent, resulting in very high machining costs for the cavity. Therefore, a specialized clamping device for this irregularly shaped workpiece needs to be designed to facilitate its machining. Summary of the Invention

[0003] This utility model addresses the aforementioned problem of needing to design special fixtures for irregularly shaped workpieces by providing a special fixture for turning irregularly shaped workpieces.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a special fixture for turning irregularly shaped workpieces, including a cylindrical end, one end of which is connected to a clamping part, the clamping part including an upper clamping end and a lower clamping end, the upper clamping end being equipped with an upper positioning block, the lower clamping end being equipped with a lower positioning block, and a cavity penetrating the cylindrical end and the clamping part being provided along the axial direction of the cylindrical end, and a guide shaft for pressing the irregularly shaped workpiece in the horizontal direction being slidably connected in the cavity.

[0005] Preferably, the lower clamping end is provided with a lower cavity hole, the lower positioning block is inserted into the lower cavity hole, and the cross-section of both the lower cavity hole and the lower positioning block is T-shaped.

[0006] Preferably, the upper clamping end is provided with an upper cavity hole, and a folded edge is provided around the lower end of the upper cavity hole. The folded edge is bent to the inside of the upper cavity hole, the upper positioning block is inserted into the upper cavity hole, and an annular protrusion is provided around the upper end of the upper positioning block corresponding to the folded edge.

[0007] Preferably, the upper positioning block is provided with a positioning cavity, the positioning cavity has a T-shaped cross-section, a steel ball is provided on the upper part of the positioning cavity, and the upper end of the steel ball extends out of the positioning cavity, and the lower diameter of the positioning cavity is smaller than the diameter of the steel ball.

[0008] Preferably, the upper cavity hole is threaded with an upper pressure block.

[0009] Preferably, the guide shaft includes a positioning end close to the irregularly shaped workpiece and a guide end away from the irregularly shaped workpiece, wherein the diameter of the positioning end is larger than the diameter of the guide end.

[0010] Preferably, a horizontal pressure block is threaded to the end of the cavity away from the irregular workpiece, the guide end passes through the horizontal pressure block, and a spring is provided between the horizontal pressure block and the positioning end, with the spring sleeved outside the guide end.

[0011] Preferably, the positioning end is provided with a limiting groove, and the clamping part is provided with a coaxial through hole and a screw hole, and a bolt is inserted into the limiting groove and the through hole.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention fixes irregularly shaped workpieces and is easily clamped by a three-jaw chuck, enabling lathes to process these irregularly shaped workpieces.

[0013] When positioning irregularly shaped workpieces, this utility model pulls the guide shaft away from the clamping part, then places the irregularly shaped workpiece on the lower positioning block, and screws the upper pressure block to push the upper positioning block to press the upper side of the irregularly shaped workpiece. Then, the guide shaft is released so that the guide shaft presses against the side of the irregularly shaped workpiece. Therefore, the entire fixing process of this utility model is simple and fast.

[0014] This utility model is equipped with a steel ball that cooperates with the positioning cavity, which not only avoids the irregular workpiece from rotating when the upper pressure block is turned, but also offsets the adverse effects caused by the non-parallelism of the upper and lower end faces of the irregular workpiece. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of an irregularly shaped workpiece; Figure 2 This is a schematic diagram of the internal cavity structure of an irregularly shaped workpiece; Figure 3 This is a schematic diagram of the structure of this utility model for clamping irregularly shaped workpieces; Figure 4 for Figure 3 A sectional view; Figure 5 This is a schematic diagram of the lower positioning block; Figure 6 This is a schematic diagram of the upper positioning block.

[0017] In the above figures, 1. Irregularly shaped workpiece; 2. Cylindrical end; 21. Cavity; 22. Horizontal pressure block; 23. Spring; 24. Screw hole; 3. Upper clamping end; 31. Upper cavity hole; 32. Folded edge; 33. Upper pressure block; 4. Lower clamping end; 41. Lower cavity hole; 5. Upper positioning block; 51. Annular protrusion; 52. Positioning cavity; 53. Steel ball; 6. Lower positioning block; 61. Cylindrical protrusion; 7. Guide shaft; 71. Guide end; 72. Positioning end; 73. Limiting groove; 8. Bolt. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] In order to process such as Figure 1 , Figure 2 The irregularly shaped workpiece 1 shown in the figure is provided by this utility model as follows: Figure 3 , Figure 4 , Figure 5 Figure 6 The fixture shown is a special fixture for turning irregularly shaped workpieces. It includes a cylindrical end 2, one end of which is connected to a clamping part with a concave cross section. The clamping part includes an upper clamping end 3 and a lower clamping end 4. An upper positioning block 5 is installed on the upper clamping end 3, and a lower positioning block 6 is installed on the lower clamping end 4. A cavity 21 is provided along the axial direction of the cylindrical end 2, penetrating the cylindrical end 2 and the clamping part. A guide shaft 7 for pressing the irregularly shaped workpiece 1 in the horizontal direction is slidably connected in the cavity 21.

[0021] The principle of this utility model for positioning irregular workpiece 1 is as follows: The upper positioning block 5 and the lower positioning block 6 of this utility model are used to press the upper end and the lower end of the irregular workpiece 1 respectively, so that the irregular workpiece 1 will not move horizontally or vertically. The guide shaft 7 presses on the side of the irregular workpiece 1, so that the irregular workpiece 1 will not rotate. When it is installed on the lathe, the cylindrical end 2 is clamped by a three-jaw chuck, thereby positioning the irregular workpiece 1 with the help of this utility model.

[0022] Furthermore, the lower clamping end 4 is provided with a lower cavity hole 41, and the lower positioning block 6 is inserted into the lower cavity hole 41. The cross sections of the lower cavity hole 41 and the lower positioning block 6 are both T-shaped. The upper side of the lower positioning block 6 is also connected to a cylindrical protrusion 61, which is used to insert the lower end of the irregular workpiece 1 and fit with a clearance to further prevent the irregular workpiece 1 from moving horizontally.

[0023] Furthermore, the upper clamping end 3 is provided with an upper cavity hole 31, and a folded edge 32 is provided around the lower end of the upper cavity hole 31. The folded edge 32 is bent inward to the upper cavity hole 31 to form an outlet with a smaller diameter than the upper cavity hole 31. The upper positioning block 5 is inserted into the upper cavity hole 31 from above. An annular protrusion 51 is provided around the upper end of the upper positioning block 5 corresponding to the folded edge 32. The annular protrusion 51 cannot pass through the outlet at the lower end of the upper cavity hole 31, so that the upper positioning block 5 will not detach from the upper cavity hole 31 from below.

[0024] Furthermore, the upper positioning block 5 is provided with a positioning cavity 52, the positioning cavity 52 has a T-shaped cross section, a steel ball 53 is provided on the upper part of the positioning cavity 52, and the upper end of the steel ball 53 extends out of the positioning cavity 52. ​​The lower diameter of the positioning cavity 52 is smaller than the diameter of the steel ball 53. The steel ball 53 can rotate inside the positioning cavity 52, but cannot pass through the positioning cavity 52.

[0025] Furthermore, the upper cavity hole 31 is threadedly connected to an upper pressure block 33, which enters from above the upper cavity hole 31.

[0026] Specifically, when the upper pressure block 33 is screwed downwards, it presses against the steel ball 53, thereby pushing the upper positioning block 5 to press the upper end of the irregular workpiece 1. The steel ball 53 transmits pressure, preventing the irregular workpiece 1 from rotating when the upper pressure block 33 is screwed on. Furthermore, if the upper and lower surfaces of the irregular workpiece 1 are not parallel, accurate positioning is difficult. Therefore, the steel ball 53 is designed to cooperate with the positioning cavity 52 to counteract the adverse effects of the non-parallelism between the upper and lower surfaces of the irregular workpiece 1.

[0027] Furthermore, the guide shaft 7 includes a positioning end 72 close to the irregular workpiece 1 and a guide end 71 away from the irregular workpiece 1. The diameter of the positioning end 72 is larger than the diameter of the guide end 71. The positioning end 72 is provided with a horizontal protrusion that inserts into the side of the irregular workpiece 1 and is clearance-fitted.

[0028] Furthermore, a horizontal pressure block 22 is threadedly connected to the end of the cavity 21 away from the irregular workpiece 1. The guide end 71 passes through the horizontal pressure block 22. A spring 23 is provided between the horizontal pressure block 22 and the positioning end 72. The spring 23 is sleeved on the outside of the guide end 71. The elastic force of the spring 23 pushes the guide shaft 7 to press on the irregular workpiece 1, preventing the guide shaft 7 from directly applying excessive pressure to the irregular workpiece 1.

[0029] Furthermore, the positioning end 72 is provided with a limiting groove 73, which is elongated. The clamping part is provided with a through hole and a screw hole 24 on the same axis. The through hole and screw hole 24 are distributed on both sides of the clamping part. Bolts 8 are inserted into the limiting groove 73 and the through hole, and the bolts 8 are threadedly connected to the screw holes 24. The length of the limiting groove 73 is the travel length of the guide shaft 7.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A special fixture for turning irregularly shaped workpieces, characterized in that, It includes a cylindrical end, one end of which is connected to a clamping part. The clamping part includes an upper clamping end and a lower clamping end. An upper positioning block is installed on the upper clamping end, and a lower positioning block is installed on the lower clamping end. A cavity is provided along the axial direction of the cylindrical end, penetrating the cylindrical end and the clamping part. A guide shaft for pressing irregularly shaped workpieces in the horizontal direction is slidably connected in the cavity.

2. The special fixture for turning irregularly shaped workpieces according to claim 1, characterized in that, The lower clamping end is provided with a lower cavity hole, and the lower positioning block is inserted into the lower cavity hole. Both the lower cavity hole and the lower positioning block have a T-shaped cross section.

3. The special fixture for turning irregularly shaped workpieces according to claim 1, characterized in that, The upper clamping end is provided with an upper cavity hole, and a folded edge is provided around the lower end of the upper cavity hole. The folded edge is bent to the inside of the upper cavity hole. The upper positioning block is inserted into the upper cavity hole, and an annular protrusion is provided around the upper end of the upper positioning block corresponding to the folded edge.

4. A special fixture for turning irregularly shaped workpieces according to claim 3, characterized in that, The upper positioning block is provided with a positioning cavity, the positioning cavity has a T-shaped cross-section, a steel ball is provided on the upper part of the positioning cavity, and the upper end of the steel ball extends out of the positioning cavity. The lower diameter of the positioning cavity is smaller than the diameter of the steel ball.

5. A special fixture for turning irregularly shaped workpieces according to claim 4, characterized in that, The upper cavity hole is threadedly connected to an upper pressure block.

6. A special fixture for turning irregularly shaped workpieces according to claim 1, characterized in that, The guide shaft includes a positioning end close to the irregularly shaped workpiece and a guide end away from the irregularly shaped workpiece, wherein the diameter of the positioning end is larger than the diameter of the guide end.

7. A special fixture for turning irregularly shaped workpieces according to claim 6, characterized in that, A horizontal pressure block is threaded to the end of the cavity away from the irregular workpiece. The guide end passes through the horizontal pressure block. A spring is provided between the horizontal pressure block and the positioning end, and the spring is sleeved outside the guide end.

8. A special fixture for turning irregularly shaped workpieces according to claim 7, characterized in that, The positioning end is provided with a limiting groove, and the clamping part is provided with a coaxial through hole and a screw hole, and a bolt is inserted into the limiting groove and the through hole.

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