Turning method for thin-wall disc part

Abstract

The invention provides a turning machining method for a thin-wall disc part, the thin-wall disc part is composed of a cylinder and an annular disc body which are integrally formed, the annular disc body is located in the axial middle of the cylinder, and the machining method comprises the steps that S1, a primary blank is roughly turned; s2, parts are clamped, specifically, the lengthened part of the primary blank is clamped through a stepped mandrel; and S3, the part is subjected to finish turning and cut off. The method is ingenious in design, low in cost, simple in process, convenient to operate, low in requirement for skills of operators and stable in machining quality; a thin-wall cylinder of the thin-wall disc part is not subjected to clamping force generated by clamping of the chuck, and part deformation caused by uneven stress is effectively avoided; the used clamp is easy to manufacture and low in cost, the matched turning method is convenient to operate, the dimensional tolerance of machined parts is stable, and the technical requirements can be guaranteed; the device is suitable for turning of all thin-wall disc parts of similar structures, and the sizes of the stepped mandrel and tool accessories can be adjusted according to different boundary dimensions of the parts.

Description

Technical Field

[0001] The invention belongs to the technical field of turning processing of thin-walled parts, and in particular relates to a turning processing method for thin-walled disc-type parts. Background Art

[0002] In the field of mechanical processing, some thin-walled disc parts are very easy to deform during processing, such as Figure 1 As shown in the figure, this type of part consists of an integrally formed cylinder 1 and an annular disc 2. The cylinder hole has a larger diameter, and the hole wall thickness t1 can be as small as 1.5 mm. The wall thickness t2 of the annular disc can be as small as 1.5 mm. Generally, the annular disc has stricter flatness requirements and verticality requirements for the cylinder hole. When turning this type of part, clamping the cylinder 1 will generate a large clamping stress. After processing, the stress release causes the part to deform, resulting in the part being elliptical, uneven in thickness, and exceeding the technical requirements of the size. Summary of the invention

[0003] The present invention discloses a turning method for thin-walled disc parts. This method adopts a special positioning clamping method and an extended structure. By changing the turning method and the cutting method, the deformation of the parts is effectively reduced, and the dimensional tolerance and related technical requirements of the thin-walled disc parts can be guaranteed. The technical solution is as follows:

[0004] A turning method for a thin-walled disc-like part, wherein the thin-walled disc-like part is composed of an integrally formed cylindrical body and an annular disc body, wherein the annular disc body is located in the axial middle of the cylindrical body, and the processing method comprises:

[0005] S1: Rough turning of the blank

[0006] The round rod blank is roughly turned into a preliminary blank, wherein the preliminary blank includes an extension part and a part part which are integrally connected, wherein the part part has a cylindrical body and an annular disc body which are similar in shape to the final product of the thin-walled disc part, one end of the cylindrical body of the part part is integrally extended along the axial direction to form an extended cylindrical body of the extension part of the same specification, and a positioning cover body for blocking the barrel mouth is formed at the barrel mouth end of the extended cylindrical body away from the part part, the positioning cover body is perpendicular to the axial center line of the barrel body as a whole, and a positioning hole is opened in the center of the positioning cover body; the extended cylindrical body, the cylindrical body of the part part and the annular disc body are all reserved with excess finishing allowances relative to the corresponding parts of the final product of the thin-walled disc part;

[0007] S2: Clamping parts

[0008] A stepped mandrel is used to clamp the extended part of the initial blank, the stepped mandrel includes a mandrel body, one axial end of the mandrel body is integrally formed with a coaxial shoulder plate body and a positioning shaft body, a screw hole is opened at the end face axis of the positioning shaft body; the positioning shaft body is embedded in the positioning hole, the fastening bolt passes through the gasket and is screwed and locked with the screw hole of the positioning shaft body, and the positioning cover body is clamped and fixed by the gasket and the shoulder plate body;

[0009] S3: Finishing parts and cutting

[0010] The precision turning of the cylinder and the annular disk is completed on the parts of the initial blank, and a reserved section with the same specifications as the cylinder is processed on the extended cylinder; then, a grooving cutter is used to slowly cut off the junction of the thin-walled disk-like parts and the reserved section from the inside of the cylinder to complete the parts processing.

[0011] Furthermore, in S1, the axial length of the round rod blank is at least twice the axial length of the cylindrical body of the thin-walled disc-like part.

[0012] Furthermore, the positioning hole is coaxial with the overall cylinder body which is formed by integrally connecting the elongated cylinder body and the cylindrical body of the component part.

[0013] Furthermore, in S1, the cylindrical body and the annular disk body of the component part are both reserved with a finishing allowance of 0.3 mm to 0.5 mm more than the corresponding parts of the thin-walled disk-like parts.

[0014] Furthermore, in S2, a torque wrench is used for tightening to ensure a consistent clamping force.

[0015] Further, the mandrel body of the stepped mandrel is clamped by a lathe.

[0016] Furthermore, in S3, the axial length of the reserved section is more than one third of the axial length of the cylinder.

[0017] Furthermore, in S3, a suitable margin is reserved when cutting to prevent thin-walled disc-like parts from falling directly, and finally, v is gently broken and removed by hand.

[0018] Furthermore, the thickness of the positioning cover body is greater than or equal to the wall thickness of the lengthened cylinder body.

[0019] The present invention solves the problems of deformation and inability to meet dimensional technical requirements of such parts during turning. The method is cleverly designed, low-cost, simple in process, easy to operate, low in operator skill requirements, and stable in processing quality. The turning method using the above positioning and clamping method can prevent the thin-walled cylindrical body of thin-walled disc-like parts from being clamped by the clamping plate, effectively avoiding deformation of parts caused by uneven force. The fixture used in this clamping method is simple to manufacture and low in cost. It is easy to operate in conjunction with the turning method used. The dimensional tolerance of the parts after processing is stable, and the technical requirements can be guaranteed. This method is suitable for turning of all thin-walled disc-like parts with similar structures, and the size of the stepped mandrel and tooling accessories can be adjusted according to the different external dimensions of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings that constitute a part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic cross-sectional view of the main structure of a thin-walled disc-like part;

[0022] Figure 2 It is a cross-sectional schematic diagram of a rough-turned blank;

[0023] Figure 3 This is a schematic diagram of the clamping of the initial blank;

[0024] Figure 4 This is a schematic diagram of parts processing and cutting. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] Step 1: Rough turning of the blank

[0028] Select a round bar blank whose axial length is at least twice the axial length of the cylinder 1 of the thin-walled disc-like part, and roughly turn the round bar blank into the following shape: Figure 2 The preliminary blank 100 shown in the figure comprises an extended part on the left side and a part part on the right side which are integrally connected, wherein the part part comprises a cylindrical body 1' and an annular disc body 2' which are similar in shape to the final product of the thin-walled disc-like part, one end of the cylindrical body 1' of the part part is integrally extended axially to form an extended cylindrical body 3 of the extended part, and the extended cylindrical body 3 of the extended part has the same inner diameter, outer diameter and wall thickness as the cylindrical body 1' of the part part, and the extended cylindrical body 3 of the extended part is formed with a positioning cover body 4 for blocking the cylindrical mouth at the end of the cylindrical mouth away from the part part, the positioning cover body 4 is perpendicular to the axis of the cylindrical body as a whole, and a positioning hole 5 is opened in the center of the positioning cover body 4, and the positioning hole 5 is coaxial with the overall cylindrical body which is integrally connected with the extended cylindrical body 3 and the cylindrical body 1'; the extended cylindrical body, the cylindrical body 1' of the part part and the annular disc body 2' are all reserved with a finishing allowance of 0.3mm to 0.5mm more than the corresponding parts of the final product of the thin-walled disc-like part;

[0029] The extended portion is used for parts clamping. The positioning hole 5 and the positioning cover body 4 are both at the end of the extended cylinder 3. The positioning hole 5 should have sufficient precision to ensure accurate positioning, and the positioning cover body 4 should have a certain thickness to ensure sufficient supporting strength.

[0030] Step 2: Clamp the parts

[0031] The step mandrel 6 is used to clamp the extended portion of the primary body 100, such as Figure 3 As shown, the stepped mandrel 6 includes a mandrel body 63, and the mandrel body 63 has a shoulder plate body 61 and a positioning shaft body 62 formed integrally with each other at one axial end thereof. A screw hole is provided at the end face axis of the positioning shaft body 62. The positioning shaft body 62 of the stepped mandrel 6 is embedded in the positioning hole 5. The fastening bolt 7 passes through the gasket 8 and is screwed and locked with the screw hole of the positioning shaft body 62. The positioning cover body 4 is clamped and fixed by the gasket 8 and the shoulder plate body 61. A torque wrench can be used for locking to ensure a consistent clamping force. The mandrel body 63 of the stepped mandrel 6 is used for lathe clamping.

[0032] Step 3: Finishing parts and cutting

[0033] like Figure 4 As shown, the precision turning of the cylinder and the annular disk is completed on the parts of the initial blank, and a reserved section with the same specifications as the cylinder 1 (same inner diameter, outer diameter and wall thickness) is processed on the extended cylinder 3, and the axial length h of the reserved section is more than one third of the axial length of the cylinder 1; then, a grooving cutter is used to slowly cut off the thin-walled disk-like parts and the reserved section from the inside of the cylinder, and a suitable margin is reserved when cutting to prevent the thin-walled disk-like parts from falling directly, and finally v is gently broken and removed by hand to complete the parts processing.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A turning method for thin-walled disc parts, characterized in that: The thin-walled disc-like parts are composed of an integrally formed cylindrical body and an annular disc body, wherein the annular disc body is located in the axial middle of the cylindrical body, and the processing method includes: S1: Rough turning of the blank The round rod blank is roughly turned into a preliminary blank, wherein the preliminary blank includes an extension part and a part part which are integrally connected, wherein the part part has a cylindrical body and an annular disc body which are similar in shape to the final product of the thin-walled disc part, one end of the cylindrical body of the part part is integrally extended along the axial direction to form an extended cylindrical body of the extension part of the same specification, and the extended cylindrical body is formed with a positioning cover body for blocking the barrel mouth at the barrel mouth end away from the part part, the positioning cover body is perpendicular to the axial center line of the barrel body as a whole, and a positioning hole is opened in the center of the positioning cover body; the extended cylindrical body, the cylindrical body of the part part and the annular disc body are all reserved with excess finishing allowance relative to the corresponding parts of the final product of the thin-walled disc part; S2: Clamping parts A stepped mandrel is used to clamp the extended part of the initial blank, the stepped mandrel includes a mandrel body, one axial end of the mandrel body is integrally formed with a coaxial shoulder plate body and a positioning shaft body, a screw hole is opened at the end face axis of the positioning shaft body; the positioning shaft body is embedded in the positioning hole, the fastening bolt passes through the gasket and is screwed and locked with the screw hole of the positioning shaft body, and the positioning cover body is clamped and fixed by the gasket and the shoulder plate body; S3: Finishing parts and cutting The precision turning of the cylinder and the annular disk is completed on the parts of the initial blank, and a reserved section with the same specifications as the cylinder is processed on the extended cylinder; then, a grooving cutter is used to slowly cut off the junction of the thin-walled disk-like parts and the reserved section from the inside of the cylinder to complete the parts processing.

2. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: In S1, the axial length of the round rod blank is at least twice the axial length of the cylinder of the thin-walled disc-like part.

3. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: The positioning hole is coaxial with the overall cylinder body which is formed by integrally connecting the elongated cylinder body and the cylinder body of the parts part.

4. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: In S1, the cylindrical body and the annular disk body of the component are both reserved with a finishing allowance of 0.3mm to 0.5mm more than the corresponding parts of the thin-walled disk-like parts.

5. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: In S2, a torque wrench is used for tightening to ensure consistent clamping force.

6. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: The mandrel body of the stepped mandrel is clamped by a lathe.

7. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: In S3, the axial length of the reserved section is more than one third of the axial length of the cylinder.

8. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: In S3, leave appropriate margin when cutting to prevent thin-walled disc parts from falling directly, and finally break the V gently by hand to remove it.

9. A turning method for thin-walled disc parts as claimed in claim 1, characterized in that: The thickness of the positioning cover body is greater than or equal to the wall thickness of the lengthened cylinder body.

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