A clamping tool for machining tubular parts

Abstract

This utility model provides a clamping fixture for machining tubular parts, belonging to the field of parts machining technology. It includes a base, a supporting recess on the top of the base, a positioning sleeve rod passing through the center of the supporting recess, a circular pressure plate passing through the positioning sleeve rod on the inner side of the supporting recess, a hexagonal head bolt threaded to the upper end of the positioning sleeve rod, a positioning shaft passing through the supporting recess, a locking screw on the top of the supporting recess, and a support bolt threaded to the top of the base. This utility model, by selecting a clamping fixture corresponding to the specifications of thin-walled long cylindrical parts, mounts the thin-walled long cylindrical parts onto the positioning sleeve rod through radial stepped holes, installs the circular pressure plate, and locks it with hexagonal head bolts. The positioning shaft is inserted into the through holes on both sides of the base and secured with locking screws. The support bolts gently support the part. This specialized fixture allows for the machining of a set of radial stepped holes in a single clamping operation, easily ensuring the coaxiality and positional accuracy requirements of the stepped holes, offering good economy and meeting high precision requirements.

Description

Technical Field

[0001] This utility model provides a clamping fixture for machining tubular parts, belonging to the field of parts machining technology. Background Technology

[0002] Because a certain aviation product requires long range, high precision, high speed, and strong penetration capability, the weight of each component of the product must be lightweight, the manufacturing precision must be high, and the wall thickness of cylindrical shell-type parts must be thin, which makes the processing increasingly difficult.

[0003] This cylindrical part is made of TC4 forged tubing, with external dimensions of ф203×ф172×285mm. It is a tall, thin-walled part with a minimum wall thickness of 1.5mm. On the inner wall of the part, near one end, there are four square-section cavities. The reinforcing ribs have undercut stepped holes. The outer circumference has threaded holes, threaded through holes, and mounting grooves for mounting parts. The specific structure is as follows... Figure 3 As shown.

[0004] Considering the part is a thin-walled component, stress relief treatment is performed after rough turning and rough milling to reduce the machining stress. This part has four sets of radial stepped holes. When the outer holes of these four sets of stepped holes are clamped and fixed using conventional clamping fixtures, it is often difficult to guarantee the coaxiality and positional accuracy of each set of stepped holes, resulting in insufficient precision. Therefore, this utility model provides a clamping fixture for machining tubular parts. Utility Model Content

[0005] The technical problem solved by this utility model is that when the four sets of radial stepped holes of a thin-walled long cylindrical part are fixed by conventional clamping fixtures, it is usually difficult to guarantee the coaxiality and positional accuracy of each set of stepped holes, and the accuracy requirements are often insufficient.

[0006] To solve the technical problem, the technical solution provided by this utility model is as follows: a clamping fixture for processing tubular parts, including a base, a supporting recess on the top of the base, a positioning sleeve rod fixedly mounted on the base passing through the center of the supporting recess, a circular pressure plate passing through the positioning sleeve rod on the inner side of the supporting recess, a hexagonal head bolt threaded to the upper end of the positioning sleeve rod and placed on the top of the circular pressure plate, a positioning shaft passing through the supporting recess, a locking screw for assisting in pressing the positioning shaft on the top of the supporting recess, and a supporting bolt placed on one side of the supporting recess threaded to the top of the base.

[0007] Furthermore, the base has hexagonal screws at its four corners, and the base has mounting holes through which the hexagonal screws pass. The hexagonal screws are mounted on the CNC lathe faceplate through the mounting holes on the four sides of the base.

[0008] Furthermore, a lifting lug is provided on one outer side wall of the support recess.

[0009] Furthermore, the base has a central positioning hole that is fixedly connected to the positioning sleeve rod.

[0010] Furthermore, the side walls of the support recess are provided with through holes through the positioning shaft, and the top of the support recess is provided with a threaded hole that communicates with the through holes and matches the locking screw.

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

[0012] By selecting a clamping fixture corresponding to the specifications of the thin-walled long cylindrical part, the thin-walled long cylindrical part is installed on the positioning sleeve through the radial stepped hole. A circular pressure plate is installed and locked with hexagonal head bolts. The positioning shaft is installed into the through holes on both sides of the base and tightened with locking screws. The part is gently supported with support bolts. Through the special fixture, a set of radial stepped holes can be machined in one clamping, which makes it easy to ensure the coaxiality and positional accuracy requirements of the stepped holes. It is economical and can ensure that the coaxiality requirement of four sets of radial stepped holes is no greater than 0.02mm and the positional accuracy requirement is no greater than φ0.1mm, with high precision requirements. Attached Figure Description

[0013] Figure 1 This is a plan view of the present invention. Figure 1 .

[0014] Figure 2 This is a plan view of the device of this utility model. Figure 2 .

[0015] Figure 3 This is a schematic diagram of the thin-walled elongated cylindrical part of this utility model.

[0016] Figure 4 This is a schematic diagram of the cutting tool of this utility model.

[0017] 1. Base; 2. Positioning shaft; 3. Circular pressure plate; 4. Positioning sleeve rod; 5. Locking screw; 6. Support bolt; 7. Hex socket screw; 8. Lifting lug; 9. Hex head bolt; 10. Thin-walled long cylindrical part; 11. Support recess; 12. Through hole. Detailed Implementation

[0018] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0019] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] According to the appendix Figure 1-4 As shown: This utility model provides a clamping fixture for processing tubular parts: it includes a base 1, a supporting recess 11 on the top of the base 1, a positioning sleeve 4 fixedly mounted on the base 1 through the center of the supporting recess 11, an intermediate positioning hole fixedly connected to the positioning sleeve 4 in the center of the base 1, a circular pressure plate 3 passing through the positioning sleeve 4 on the inner side of the supporting recess 11, and a hexagonal head bolt 9 threadedly connected to the upper end of the positioning sleeve 4 on the top of the circular pressure plate 3. Specifically, the positioning sleeve 4 is installed in the intermediate positioning hole of the base 1, the thin-walled long cylindrical part 10 is installed on the positioning sleeve 4 through the radial stepped hole with a clearance of less than 0.01mm, the circular pressure plate 3 is installed, and it is locked with the hexagonal head bolt 9, and its outer circle runout is corrected to be less than 0.01mm.

[0022] As per the instruction manual Figure 1 , 2 As shown in Figure 3: A positioning shaft 2 passes through the support recess 11. The top of the support recess 11 is provided with a locking screw 5 for assisting in pressing the positioning shaft 2. The top of the base 1 is threadedly connected with a support bolt 6 placed on one side of the support recess 11. The two side walls of the support recess 11 are provided with through holes 12 that pass through the positioning shaft 2. The top of the support recess 11 is provided with a threaded hole that communicates with the through holes 12 and matches the locking screw 5. Specifically, the positioning shaft 2 is passed through the radial stepped holes on both sides of the thin-walled long cylindrical part 10, and the locking screw 5 is used to assist in pressing the positioning shaft 2.

[0023] As per the instruction manual Figure 1 As shown: A lifting lug 8 is provided on one outer side wall of the support recess 11 for hoisting and clamping the fixture through the lifting lug 8. The four corners of the base 1 are fitted with hexagonal screws 7. The base 1 has mounting holes through which the hexagonal screws 7 pass. The hexagonal screws 7 pass through the mounting holes on the four sides of the base 1 and are installed on the CNC lathe faceplate. The roughing runout of the base 1 reference outer circle is less than 0.05mm.

[0024] The principle of this utility model

[0025] In use, select the appropriate clamping fixture for the corresponding thin-walled elongated cylindrical part 10. The base 1 is hoisted by the lifting lug 8. Four hexagonal screws 7 are passed through the mounting holes on the four sides of the base 1 and installed on the CNC lathe faceplate. Roughly align the base 1 so that the outer diameter runout is less than 0.05mm. Install the positioning sleeve 4 in the central positioning hole of the base 1 and correct its outer diameter runout to less than 0.01mm. Install the thin-walled elongated cylindrical part 10 onto the positioning sleeve 4 through the radial stepped hole, ensuring a clearance of less than 0.0mm. 1mm, install the circular pressure plate 3 and tighten it with hexagonal head bolts 9; install the positioning shaft 2 into the through holes 12 on both sides of the base 1, and use locking screws 5 to assist in tightening. During the tightening process, control the clamping force with a dial indicator. The change in the dial indicator value should be less than 0.05mm. Verify the runout of the positioning shaft 2 in the axial stepped hole of the thin-walled long cylindrical part 10 by using the dial indicator. The runout should be less than 0.02mm. After clamping, gently support the part with support bolts 6 for auxiliary support; after clamping and alignment, use an L-shaped special tool (as per the instruction manual) Figure 4 The workpiece is machined by turning radial stepped holes as shown in the figure. The machining process is divided into semi-finishing and finishing to prevent large residual stress in the workpiece. The cutting depth is less than 0.5 mm during finishing and less than 0.1 mm during finishing. A set of radial stepped holes can be machined in one clamping by using special tooling. It is easy to ensure the coaxiality and positional accuracy of the stepped holes. It is economical and can ensure that the coaxiality of four sets of radial stepped holes is no greater than 0.02 mm and the positional accuracy is no greater than φ0.1 mm. The accuracy requirement is high.

[0026] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A clamping fixture for machining tubular parts, comprising a base (1), characterized in that: The base (1) has a support recess (11) on top. A positioning sleeve (4) fixedly mounted on the base (1) passes through the center of the support recess (11). A circular pressure plate (3) passes through the positioning sleeve (4) on the inner side of the support recess (11). A hexagonal head bolt (9) is threaded to the upper end of the positioning sleeve (4) and placed on the top of the circular pressure plate (3). A positioning shaft (2) passes through the support recess (11). A locking screw (5) for assisting in pressing the positioning shaft (2) is provided on the top of the support recess (11). A support bolt (6) placed on one side of the support recess (11) is threaded to the top of the base (1).

2. The clamping fixture for machining tubular parts according to claim 1, characterized in that: The base (1) has hexagonal screws (7) at its four corners. The base (1) has mounting holes through which the hexagonal screws (7) pass. The hexagonal screws (7) pass through the mounting holes on the four sides of the base (1) and are mounted on the CNC lathe faceplate.

3. The clamping fixture for machining tubular parts according to claim 1, characterized in that: The supporting recess (11) has a lifting lug (8) on one of its outer side walls.

4. The clamping fixture for machining tubular parts according to claim 1, characterized in that: The base (1) has a central positioning hole that is fixedly connected to the positioning sleeve (4).

5. A clamping fixture for machining tubular parts according to claim 1, characterized in that: The support recess (11) has through holes (12) on both sides of the support recess (11) through the positioning shaft (2), and the top of the support recess (11) has a threaded hole that communicates with the through holes (12) and matches the locking screw (5).

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