A self-centering clamping device for cylindrical parts

Abstract

The utility model belongs to tool frock design field discloses a kind of self-centering clamping devices of cylinder parts, including mandrel (1), gasket (2), bulge block (3), expansion spring (4), positioning pin (5), support block (6);Two positioning pins (5) one end is placed into the corresponding two blind holes of workbench, make it and workbench blind hole interference fit;Two blind holes of support block (6) and the other end clearance fit of two positioning pins (5);The taper hole of one end of expansion spring (4) cooperates with the taper surface of support block (6), after the taper surface of bulge block (3) cooperates with the other end taper hole of expansion spring (4), the inner cavity of the cylinder part being processed is sleeved on the outer diameter of expansion spring (4).The utility model once meter finds right after, it can mass production, need not multiple meter to find right, realizes the self-centering of processing cylinder part, reduces clamping fixing time, and the device is simple to operate, and the precision of processing part is better.

Description

Technical Field

[0001] This utility model belongs to the field of tool and fixture design, and in particular relates to a self-centering clamping device for cylindrical parts. Background Technology

[0002] Currently, machining cylindrical parts requires dial indicator alignment for each part, which increases machining auxiliary time. There is an urgent need for a clamping device for machining cylindrical parts that can perform mass production after a single dial indicator alignment, thereby improving machining efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a device that can perform self-centering clamping of cylindrical parts.

[0004] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows: A self-centering clamping device for cylindrical parts includes a mandrel 1, a washer 2, a tension block 3, a tension spring 4, a locating pin 5, and a support block 6; One end of each of the two locating pins 5 is inserted into the corresponding two blind holes of the worktable, so that they are interference fit with the blind holes of the worktable; the two blind holes of the support block 6 are clearance fit with the other ends of the two locating pins 5. One end of the spring 4 has a tapered hole that mates with the tapered surface of the support block 6. After the tapered surface of the spring 3 mates with the tapered hole at the other end of the spring 4, the inner cavity of the cylindrical part being machined is fitted onto the outer diameter of the spring 4. The spindle 1 is welded together with the washer 2. The end of the spindle 1 with external threads passes through the center holes of the spring 3, the spring 4, and the support block 6 in sequence and is screwed into the threaded blind hole of the worktable.

[0005] Furthermore, the mandrel 1 is a cylinder with an external thread at one end, a square head at the other end, and a smooth cylinder in the middle. The threaded end passes through the center holes of the washer 2, the expansion block 3, the expansion spring 4, and the support block 6 in sequence, and is finally screwed into the worktable. The washer 2 is fixed to the smooth cylinder of the mandrel 1 by welding.

[0006] Furthermore, gasket 2 is a cylindrical thin sheet.

[0007] Furthermore, the expansion block 3 is frustum-shaped with a through hole at the center. The conical surface of the expansion block 3 presses against the conical surface of the expansion spring 4, and the angle of its conical surface is consistent with the angle of the conical surface of the conical hole of the expansion spring 4. An axial force is applied to the expansion spring 4, and a radial force is generated by the conical surface, causing the expansion spring 4 to expand. The outer diameter is closely fitted with the inner diameter of the workpiece, which plays a role in supporting the workpiece and completing the self-centering function.

[0008] Furthermore, the spring 4 is a cylinder with tapered holes at both ends of the inner cavity and a round hole in the middle. There are 16 alternating straight grooves on the outer circumference, with 8 grooves evenly distributed on the upper surface and 8 grooves evenly distributed on the lower surface. The tapered hole is designed to convert the axial force applied by the expansion block 3 into a radial force. At the same time, the straight groove undergoes elastic deformation to expand the spring 4, so that the outer diameter of the spring 4 fits tightly with the inner diameter of the cavity of the workpiece.

[0009] Furthermore, the support block 6 is frustum-shaped with a through hole at the center and two blind holes along the axial direction on the bottom surface. The cone angle of the bottom surface is consistent with the cone angle of the conical hole of the spring 4.

[0010] This invention has the following advantages: after one dial indicator alignment, mass production can begin without multiple dial indicator alignments, achieving self-centering of the processed cylindrical parts, reducing clamping and fixing time, and the device is simple to operate and produces parts with good precision. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of a self-centering clamping device according to the present invention; Figure 2 for Figure 1 Front view of the middle spring 4; Figure 3 for Figure 2 Left view of the middle spring 4; Figure 4 for Figure 2 AA section view of the middle tension spring 4; In the diagram: 1-mandrel, 2-shim, 3-expansion block, 4-expansion spring, 5-locating pin, 6-support block. Detailed Implementation

[0012] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0013] like Figure 1 , 2 As shown in Figures 3 and 4, a self-centering clamping device of this utility model includes a spindle 1, a washer 2, a tension block 3, a tension spring 4, a positioning pin 5, and a support block 6.

[0014] The mandrel 1 is cylindrical, with an external thread at one end and a square head at the other. The threaded end passes sequentially through the washer 2, the expansion block 3, the expansion spring 4, and the center hole of the support block 6, and is finally screwed into the worktable. The washer 2 is fixed to the smooth cylindrical part of the mandrel 1 by welding. The other end, the square head, is screwed into the worktable by rotating a wrench with an appropriate wrench and tightened.

[0015] The gasket 2 is a thin cylindrical sheet with a smooth through hole in the center. The mandrel 1 passes through the smooth through hole in the center of the gasket 2 and is fixed to the smooth cylindrical part of the mandrel 1 by welding.

[0016] The expansion block 3 is frustum-shaped with a through hole in the center. The spindle 1 passes through the center hole of the expansion block 3. The conical surface of the expansion block 3 presses against the conical surface of the expansion spring 4. The angle of its conical surface is consistent with the angle of the conical surface of the conical hole of the expansion spring 4. An axial force is applied to the expansion spring 4, and a radial force is generated by the conical surface, causing the expansion spring 4 to expand. The outer diameter is closely fitted with the inner diameter of the workpiece, which plays a role in supporting the workpiece and completing the self-centering function.

[0017] The spring 4 is a cylinder with tapered holes at both ends and a round hole in the middle. There are 16 alternating straight grooves on its outer circumference, 8 evenly distributed on the upper surface and 8 evenly distributed on the lower surface. The tapered hole design converts the axial force applied by the expansion block 3 into a radial force. Simultaneously, the elastic deformation of the straight grooves expands the spring 4, allowing its outer diameter to fit tightly against the inner diameter of the workpiece cavity, thus supporting the workpiece and achieving self-centering.

[0018] The positioning pin 5 is a cylindrical pin, there are 2 in total. One end is interference-fitted with the blind hole on the worktable, and the other end is clearance-fitted with the blind hole of the support block 6 to achieve the positioning function.

[0019] The support block 6 is frustum-shaped with a through hole in the center and two blind holes on the bottom surface along the axial direction. The cone angle of the support block 6 is consistent with the cone angle of the conical hole of the spring 4, which serves to support the spring 4 and achieve self-centering.

[0020] In practical use: Insert one end of each of the two locating pins 5 into the corresponding blind holes on the worktable, ensuring an interference fit for positioning. Then, align the two blind holes of the support block 6 with the other ends of the two locating pins 5. Using a dial indicator, align the support block 6, then align one end of the spring 4's tapered hole with the tapered surface of the support block 6. Next, align the tapered surface of the expansion block 3 with the other end of the spring 4's tapered hole. Finally, fit the inner cavity of the cylindrical part to be machined onto the outer diameter of the spring 4. Next, thread the end of the welded mandrel 1 and washer 2 through the center holes of the expansion block 3, spring 4, and support block 6, and screw it into the threaded blind hole on the worktable. Tighten the mandrel 1 by rotating its square head with a wrench. Machin the part to the required shape according to the drawing.

[0021] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the protection scope of the present invention.

Claims

1. A self-centering clamping device for cylindrical parts, characterized in that, Includes a spindle (1), a washer (2), a tension block (3), a tension spring (4), a locating pin (5), and a support block (6); One end of each of the two locating pins (5) is inserted into the corresponding two blind holes of the worktable, so that they are interference fit with the blind holes of the worktable; the two blind holes of the support block (6) are clearance fit with the other ends of the two locating pins (5); One end of the spring (4) has a tapered hole that mates with the tapered surface of the support block (6). After the tapered surface of the spring block (3) mates with the tapered hole at the other end of the spring (4), the inner cavity of the cylindrical part being machined is fitted onto the outer diameter of the spring (4). The spindle (1) is welded together with the washer (2). The end of the spindle (1) with external threads passes through the center holes of the spring block (3), the spring (4), and the support block (6) in sequence and is screwed into the threaded blind hole of the worktable.

2. The self-centering clamping device for cylindrical parts according to claim 1, characterized in that, The mandrel (1) is a cylinder with an external thread at one end, a square head at the other end, and a smooth cylinder in the middle. The threaded end passes through the center hole of the washer (2), the expansion block (3), the expansion spring (4), and the support block (6) in sequence, and is finally screwed into the worktable. The washer (2) is fixed to the smooth cylinder of the mandrel (1) by welding.

3. The self-centering clamping device for cylindrical parts according to claim 1, characterized in that, The gasket (2) is a cylindrical thin sheet.

4. The self-centering clamping device for cylindrical parts according to claim 1, characterized in that, The expansion block (3) is frustum-shaped with a through hole in the center. The conical surface of the expansion block (3) presses against the conical surface of the expansion spring (4). The angle of its conical surface is consistent with the angle of the conical surface of the conical hole of the expansion spring (4). An axial force is applied to the expansion spring (4), and a radial force is generated by the conical surface, causing the expansion spring (4) to expand. The outer diameter is closely fitted with the inner diameter of the workpiece, which supports the workpiece and completes the self-centering function.

5. The self-centering clamping device for cylindrical parts according to claim 1, characterized in that, The spring (4) is a cylinder with tapered holes at both ends of the inner cavity and a round hole in the middle. There are 16 alternating straight grooves on the outer circumference, 8 on the upper surface and 8 on the lower surface. The tapered hole is designed to convert the axial force applied by the expansion block (3) into a radial force. At the same time, the straight groove undergoes elastic deformation to expand the spring (4), so that the outer diameter of the spring (4) fits tightly with the inner diameter of the cavity of the workpiece.

6. The self-centering clamping device for cylindrical parts according to claim 1, characterized in that, The support block (6) is frustum-shaped with a through hole in the center and two blind holes along the axial direction on the bottom surface. The cone angle of the bottom surface is consistent with the cone angle of the cone hole of the spring (4).

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