Finish turning tool for trumpet-shaped thin-wall workpiece

Abstract

The invention discloses a finish turning tool for a trumpet-shaped thin-wall workpiece. The finish turning tool comprises a mould tool. The two ends of the mould tool are respectively a small end and a large end; the small-end inner hole is of a threaded structure which is consistent with an external thread of the trumpet-shaped thin-wall workpiece in size, and the length of the thread is larger than that of the external thread of the trumpet-shaped thin-wall workpiece; the inner shape of the large end is an inclined surface, and the end surface of the large end is an assembly in-place surface; the depth of the mould tool is larger than the length of the tail end of the horn-shaped thin-wall workpiece. The tool does not have any radial pressure on the thin-wall workpiece, the problem that the workpiece lacks an axial clamping pressing table is effectively solved through a thread structure, and meanwhile oval deformation caused by radial stress of the thin-wall workpiece is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a finishing tool for a trumpet-shaped thin-walled workpiece. Background Art

[0002] The difficulty of processing trumpet-shaped thin-walled workpieces increases as the wall thickness decreases. Vibration causes deformation of the workpiece during processing. The last finishing process lacks a clamping position. Direct clamping of the machine tool spindle will cause deformation of important dimensions such as the outer circle and inner hole of the product. For trumpet-shaped thin-walled parts, there is a thin-walled straight section in the middle of the workpiece during finishing turning. The mass of the large end to be processed is large. When turning the large end, the spindle clamps the small end of the workpiece. The workpiece in this clamping state is a cantilever beam structure, and the coaxiality and size of the large end cannot be effectively guaranteed.

[0003] Nanjing Jinxin Transmission Equipment Co., Ltd. proposed a semi-finishing turning tool for processing thin-walled sleeves in the utility model application number CN204954441U. The semi-finishing turning tool for processing thin-walled sleeves can ensure that the thin-walled sleeves will not be deformed when turning. It has good practicality, but requires the workpiece to have a clamping press. McAudy (Xiamen) Electric Co., Ltd. designed a thin-walled cylindrical turning fixture in the utility model application number CN207756940U, including a main spindle and a clamping part. The clamping part includes two centering cone sleeves with mirror settings and tapered surfaces inward. An expansion sleeve is provided between the two centering cone sleeves to achieve one-time clamping processing of the inner hole and the outer circle, solving the problem that the internal expansion tool is inconvenient to disassemble and assemble the product and is easy to "lock" with the workpiece. Jiangsu Dibang Sanxing Bearing Co., Ltd. has designed a thin-walled workpiece finishing fixture in the utility model application number CN201881180U, which includes a clamping section, a mandrel and a ring wall with an integrated structure. The wall section of the front end of the ring wall is an inverted "convex" structure, and the end cover is connected with the ring wall to clamp the thin-walled workpiece between the two. The existing thin-walled workpiece finishing fixture has a complex structure and contains multiple parts assembly, which is not suitable for thin-walled workpieces with relatively large mass at both ends. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a finishing tool for a trumpet-shaped thin-walled workpiece, including a jig tool; the two ends of the jig tool are respectively a small end and a large end; the inner hole of the small end is a threaded structure, the threaded structure is consistent with the external thread size of the trumpet-shaped thin-walled workpiece, and the thread length is greater than the external thread length of the trumpet-shaped thin-walled workpiece; the inner profile of the large end is a slope, and the end face of the large end is an assembly surface; the depth of the jig tool is greater than the length of the tail end of the trumpet-shaped thin-walled workpiece. The jig of the present invention does not exert any radial pressure on the thin-walled workpiece, and utilizes the threaded structure to effectively solve the problem of the lack of an axial clamping platform for the workpiece, while also avoiding the elliptical deformation of the thin-walled workpiece caused by radial force.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A finishing tool for a trumpet-shaped thin-walled workpiece, comprising a jig tool; two ends of the jig tool are respectively a small end and a large end;

[0007] The inner hole of the small end is a threaded structure, the threaded structure is consistent with the external thread size of the trumpet-shaped thin-walled workpiece, and the thread length is greater than the external thread length of the trumpet-shaped thin-walled workpiece;

[0008] The inner profile of the large end is an inclined surface, and the end surface of the large end is an assembly surface;

[0009] The depth of the jig is greater than the length of the tail end of the trumpet-shaped thin-wall workpiece.

[0010] Preferably, two process exhaust holes are distributed opposite to each other on the outer circle of the large end.

[0011] Preferably, the flatness of the small end face and the large end face of the jig is less than 0.02.

[0012] Preferably, the inner hole diameter of the large end is smaller than the inner hole diameter of the trumpet-shaped thin-wall workpiece contact surface.

[0013] Preferably, the outer diameter of the large end is smaller than the outer diameter of the contact surface of the trumpet-shaped thin-walled workpiece.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. This tooling does not exert any radial pressure on thin-walled workpieces. The threaded structure effectively solves the problem of lack of axial clamping platform for workpieces, while also avoiding elliptical deformation of thin-walled workpieces caused by radial force.

[0016] 2. The traditional combined tooling for processing such products has a long cantilever structure. When processing the outer shape, the mandrel guarantees the outer size, but when processing the inner shape, after the mandrel is removed, the long cantilever structure of the workpiece leads to poor stability at the large end, resulting in the inability to guarantee the inner hole size and coaxiality of the large end of the product. The positioning surface of this tooling contacts the workpiece surface to provide support, ensuring the strength of the spindle support end and increasing the stability of the workpiece during the turning process.

[0017] 3. Use this tooling to fine-process the large end of the workpiece. Installing the tooling once can complete the internal and external processing of the workpiece, eliminate the clamping and positioning of multiple fixtures, reduce repeated positioning errors, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the workpiece structure.

[0019] Figure 2 It is a schematic diagram of the structure of the present invention.

[0020] Figure 3 It is a schematic diagram of assembling a workpiece to be processed and the tooling of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] The invention aims to provide a finishing tool suitable for thin-walled trumpet-shaped workpieces, which is easy to use, has one-time positioning, small clamping deformation and high efficiency.

[0023] like Figure 1 and Figure 2 As shown, in order to achieve the technical purpose, the scheme of the present invention is a finishing tool for a trumpet-shaped thin-walled workpiece, including a jig tool, the inner hole of the small end of the jig tool is a threaded structure, the thread M (6H) is consistent with the size of the external thread M (6g) of the workpiece, and the length is greater than the length of the external thread of the workpiece, that is, l2>L2; the inner profile of the large end is an inclined surface, and the B surface of the large end is an assembly surface, that is, l1>L1; the outer circle of the large end is oppositely distributed with process exhaust holes 2×d3.

[0024] Preferably, the thread structure of the inner hole of the small end is tightly matched with the external thread of the workpiece during processing.

[0025] Preferably, the flatness of the small end face (A face) and the large end face (B face) of the jig tooling is less than 0.02.

[0026] Preferably, the inner hole d2 of the large end of the jig is smaller than the inner hole D2 of the workpiece contact surface (C surface), and the outer circle d1 is smaller than the outer circle D1 of the workpiece contact surface (C surface).

[0027] Through the positioning and support guarantee of this tooling, stable and efficient precision turning of the large opening end of a trumpet-shaped thin-walled workpiece can be achieved on the lathe.

[0028] Example:

[0029] like Figure 2 As shown, the specific embodiment of the present invention is a finishing tool for a trumpet-shaped thin-walled workpiece, including: a jig. The characteristics are: the inner profile of the small end of the jig has a thread structure M (6H), which is tightly matched with the processed external thread M (6g) of the workpiece; the inner hole d2 of the large end of the jig is less than the inner hole D2 of the workpiece contact surface (C surface), and the outer circle d1 is less than the outer circle D1 of the workpiece contact surface (C surface); the inner profile of the large end is a contoured inclined surface, and the large end surface (B surface) of the jig is an assembly surface; at the same time, the largest outer circle of the jig has oppositely distributed process exhaust holes 2×d3; the flatness of the A surface and B surface of the jig is less than 0.02. Specific implementation method:

[0031] (1) Figure 3As shown, the lathe spindle jaws are loosened, and the jig tooling is inserted into the jaws. The end face of the small end of the tooling (i.e., the B face of the tooling) fits with the end face of the machine tool spindle jaws. Then the machine tool spindle jaws clamp the outer circle of the small end of the tooling. The runout of the large end face (B face) of the jig tooling in this state is measured with a dial indicator and is less than 0.02. At this point, the jig tooling is installed in place.

[0032] (2) Screw the small end thread of the workpiece into the internal thread of the tooling until the C surface of the workpiece fits with the B surface of the mold tooling. Use a feeler gauge to check and confirm that there is no gap. At this time, the workpiece is installed in place and the inner and outer finish turning of the large end of the workpiece begins. After the large end of the workpiece is finished, rotate the large end of the workpiece to separate the processed workpiece from the lifting tooling and take out the workpiece.

[0033] (3) Repeat step (2) to complete the large end finishing of multiple workpieces.

Claims

1. A finishing tool for a trumpet-shaped thin-walled workpiece, characterized in that: It comprises a tire jig; the two ends of the tire jig are respectively a small end and a large end; The inner hole of the small end is a threaded structure, the threaded structure is consistent with the external thread size of the trumpet-shaped thin-walled workpiece, and the thread length is greater than the external thread length of the trumpet-shaped thin-walled workpiece; The inner profile of the large end is an inclined surface, and the end surface of the large end is an assembly surface; The depth of the jig is greater than the length of the tail end of the trumpet-shaped thin-wall workpiece.

2. A finishing tool for trumpet-shaped thin-walled workpieces, characterized in that: Two process exhaust holes are distributed opposite to each other on the outer circle of the large end.

3. A finishing tool for trumpet-shaped thin-walled workpieces, characterized in that: The flatness of the small end face and the large end face of the jig tooling is less than 0.

02.

4. A finishing tool for trumpet-shaped thin-walled workpieces, characterized in that: The inner hole diameter of the large end is smaller than the inner hole diameter of the trumpet-shaped thin-wall workpiece contact surface.

5. A finishing tool for trumpet-shaped thin-walled workpieces, characterized in that: The outer diameter of the large end is smaller than the outer diameter of the contact surface of the trumpet-shaped thin-walled workpiece.

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