A turning method for thin-walled disc-shaped parts

Abstract

The application provides a turning processing method for a thin-wall disc part, the thin-wall disc part is composed of an integral forming cylinder body and an annular disc body, the annular disc body is located in the axial middle part of the cylinder body, and the processing method comprises the following steps: S1, rough turning a preliminary blank; S2, clamping the part, adopting a stepped mandrel to clamp the lengthened part of the preliminary blank; S3, finishing turning the part and cutting off. The application has the advantages of ingenious design, low cost, simple process, convenient operation, low skill requirement for the operator, stable processing quality, etc. The thin-wall cylinder body of the thin-wall disc part is not subjected to the clamping force generated by the chuck clamping, and the part deformation caused by uneven force is effectively avoided. The used clamp is simple to make and low in cost, the turning processing method is convenient to operate, the size tolerance of the processed part is stable, the technical requirement can be guaranteed, and the turning processing is suitable for all similar thin-wall disc parts with the structure, and the size of the stepped mandrel and the tooling accessories can be adjusted according to the different part shape and size.

Description

Technical Field

[0001] This invention belongs to the field of thin-walled parts turning technology, and in particular relates to a turning method for thin-walled disc-shaped parts. Background Technology

[0002] In the field of machining, some thin-walled disc-shaped parts are prone to deformation during processing, such as... Figure 1 As shown, this type of part consists of an integrally formed cylindrical body 1 and an annular disc body 2. The cylindrical body has a relatively large bore diameter, while the minimum wall thickness t1 can be 1.5 mm. The minimum wall thickness t2 of the annular disc body can also be 1.5 mm. Generally, the annular disc body has relatively strict requirements for flatness and perpendicularity to the bore. When machining this type of part, clamping the cylindrical body 1 will generate a large clamping stress. After machining, the stress release will cause the part to deform, resulting in elliptical shape, uneven thickness, and dimensional deviations. Summary of the Invention

[0003] This invention discloses a turning method for thin-walled disc-shaped parts. This method employs a special positioning and clamping method and an extended structure. By changing the turning and cutting methods, it effectively reduces the deformation of the parts, ensuring the dimensional tolerances and related technical requirements of the thin-walled disc-shaped parts. The specific technical solution is as follows: A turning method for a thin-walled disk-like part, the thin-walled disk-like part being composed of an integrally formed cylindrical body and an annular disk body, the annular disk body being located at the axial center of the cylindrical body, the machining method comprising: S1: Rough turning of the initial billet The round bar blank is rough-machined into a preliminary blank, which includes an extended section and a part section integrally connected together. The part section has a cylindrical body and an annular disc body with shapes similar to the final finished product of the thin-walled disc-type part. One end of the cylindrical body of the part section extends axially to form an extended cylindrical body of the same specification as the extended section. A positioning cover is formed at the end of the extended cylindrical body away from the opening of the part section to seal the opening. The positioning cover is perpendicular to the axis of the cylindrical body, and a positioning hole is opened in the center of the positioning cover. The extended cylindrical body, the cylindrical body of the part section, and the annular disc body are all reserved with excess finishing allowance relative to the corresponding parts of the final finished product of the thin-walled disc-type part. S2: Clamping parts The extended part of the blank is clamped by a stepped mandrel. The stepped mandrel includes a mandrel body. A coaxial shoulder plate and a positioning shaft are integrally formed at one axial end of the mandrel body. A screw hole is opened at the center of the end face of the positioning shaft. The positioning shaft is embedded in the positioning hole. The fastening bolt passes through the washer and is screwed into the screw hole of the positioning shaft to lock and fix it. The positioning cover is clamped and fixed by the washer and the shoulder plate. S3: Precision machining and cutting of parts The cylindrical body and the annular disc body are precision machined on the initial blank part, and an additional reserved section of the same specifications as the cylindrical body is machined on the extended cylinder body; then, a grooving cutter is used to slowly cut from the inside of the cylinder body at the junction of the thin-walled disc part and the reserved section to complete the part machining.

[0004] Furthermore, in S1, the axial length of the round bar blank is at least twice the axial length of the cylindrical body of the thin-walled disc-type part.

[0005] Furthermore, the positioning hole is coaxial with the overall cylinder, which is integrally connected to the elongated cylindrical body and the cylindrical body of the component parts.

[0006] Furthermore, in S1, both the cylindrical body and the annular disk body of the part are reserved with a finishing allowance of 0.3mm to 0.5mm more than the corresponding parts of the thin-walled disk-type parts.

[0007] Furthermore, in S2, a torque wrench is used for locking to ensure consistent clamping force.

[0008] Furthermore, the mandrel body of the stepped mandrel is clamped by a lathe.

[0009] Furthermore, in S3, the axial length of the reserved section is more than one-third of the axial length of the cylindrical body. Furthermore, in S3, a suitable allowance is left when cutting to prevent thin-walled disc-shaped parts from falling directly. Finally, the thin-walled disc-shaped parts are gently broken off and removed by hand.

[0010] Furthermore, the thickness of the positioning cover is greater than or equal to the wall thickness of the extended cylinder.

[0011] This invention solves the problems of deformation and inability to guarantee dimensional requirements during the turning of such parts. The method is ingeniously designed, low-cost, simple in process, easy to operate, requires minimal operator skill, and produces stable machining quality. The turning method using the above-described positioning and clamping method prevents the thin-walled cylindrical body of thin-walled disc-shaped parts from being subjected to clamping forces from the chuck, effectively avoiding deformation caused by uneven stress. The fixtures used in this clamping method are simple to manufacture and low in cost. Combined with the convenient turning method, the machined parts exhibit stable dimensional tolerances, ensuring that technical requirements are met. This method is applicable to the turning of all similar thin-walled disc-shaped parts, and the size of the stepped mandrel and tooling accessories can be adjusted according to the different dimensions of the parts. Attached Figure Description

[0012] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional view of the body structure of a thin-walled disk-type part; Figure 2 This is a cross-sectional view of the rough-turned billet. Figure 3 This is a schematic diagram of the initial billet clamping process; Figure 4 This is a schematic diagram of part machining and cutting. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] Step 1: Rough turning of the initial billet Select a cylindrical bar blank with an axial length at least twice the axial length of the thin-walled disc-type part, and rough machine the cylindrical bar blank as follows: Figure 2 The initial blank 100 shown includes an extended section on the left and a part section on the right, which are integrally connected. The part section has a cylindrical body 1' and an annular disc body 2' with shapes similar to the final finished thin-walled disc parts. One end of the cylindrical body 1' of the part section extends axially to form an extended cylindrical body 3 of the extended section. The extended cylindrical body 3 of the extended section has the same inner diameter, outer diameter and wall thickness as the cylindrical body 1' of the part section. A positioning cover 4 is formed at the end of the extended cylindrical body 3 away from the opening of the part section to seal the opening. The positioning cover 4 is perpendicular to the axis of the cylindrical body. A positioning hole 5 is opened in the center of the positioning cover 4. The positioning hole 5 is coaxial with the overall cylindrical body formed by the integral connection of the extended cylindrical body 3 and the cylindrical body 1'. The extended cylindrical body, the cylindrical body 1' of the part section 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 finished thin-walled disc parts. The extended section is used for clamping parts. The positioning hole 5 and the positioning cover 4 are both located at the end of the extended cylinder 3. The positioning hole 5 should have sufficient precision to ensure accurate positioning, and the positioning cover 4 should have a certain thickness to ensure sufficient support strength.

[0017] Step 2: Clamping the parts The extended portion of the initial blank 100 is clamped using a stepped mandrel 6, such as... Figure 3As shown, the stepped mandrel 6 includes a mandrel body 63. A coaxial shoulder plate 61 and a positioning shaft 62 are integrally formed at one axial end of the mandrel body 63. A threaded hole is provided on the end face of the positioning shaft 62. The positioning shaft 62 of the stepped mandrel 6 is embedded in the positioning hole 5. A fastening bolt 7 passes through a washer 8 and is threaded into the threaded hole of the positioning shaft 62 for locking and fixing. The washer 8 and the shoulder plate 61 clamp and fix the positioning cover 4. A torque wrench can be used for locking to ensure consistent clamping force. The mandrel body 63 of the stepped mandrel 6 is used for lathe clamping.

[0018] Step 3: Precision machining and cutting of parts like Figure 4 As shown, the cylindrical body and the annular disc body are precision machined on the part of the initial blank. An additional reserved section with the same specifications as the cylindrical body 1 (same inner diameter, outer diameter and wall thickness) is machined on the extended cylindrical body 3. The axial length h of the reserved section is more than one-third of the axial length of the cylindrical body 1. Then, a grooving cutter is used to slowly cut the thin-walled disc-like part at the junction with the reserved section from the inside of the cylindrical body. When cutting, an appropriate allowance is left to prevent the thin-walled disc-like part from falling directly. Finally, the thin-walled disc-like part is gently broken off by hand and removed to complete the part machining.

[0019] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A turning method for thin-walled disc-shaped parts, characterized in that, The thin-walled disk-like part consists of an integrally formed cylindrical body and an annular disk body, with the annular disk body located at the axial center of the cylindrical body. The processing method includes: S1: Rough turning of the initial billet The round bar blank is rough-machined into a preliminary blank, which includes an extended section and a part section integrally connected together. The part section has a cylindrical body and an annular disc body with shapes similar to the final finished product of the thin-walled disc-type part. One end of the cylindrical body of the part section extends axially to form an extended cylindrical body of the same specification as the extended section. A positioning cover is formed at the end of the extended cylindrical body away from the opening of the part section to seal the opening. The positioning cover is perpendicular to the axis of the cylindrical body, and a positioning hole is opened in the center of the positioning cover. The extended cylindrical body, the cylindrical body of the part section, and the annular disc body are all reserved with excess finishing allowance relative to the corresponding parts of the final finished product of the thin-walled disc-type part. S2: Clamping parts The extended part of the blank is clamped by a stepped mandrel. The stepped mandrel includes a mandrel body. A coaxial shoulder plate and a positioning shaft are integrally formed at one axial end of the mandrel body. A screw hole is opened at the center of the end face of the positioning shaft. The positioning shaft is embedded in the positioning hole. The fastening bolt passes through the washer and is screwed into the screw hole of the positioning shaft to lock and fix it. The positioning cover is clamped and fixed by the washer and the shoulder plate. S3: Precision machining and cutting of parts The cylindrical body and the annular disc body are precision machined on the initial blank part, and an additional reserved section of the same specifications as the cylindrical body is machined on the extended cylinder body; then, a grooving cutter is used to slowly cut from the inside of the cylinder body at the junction of the thin-walled disc part and the reserved section to complete the part machining.

2. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, In S1, the axial length of the round bar blank is at least twice the axial length of the cylindrical body of the thin-walled disc-type part.

3. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, The positioning hole is coaxial with the main cylinder, which is integrally connected to the elongated cylindrical body and the cylindrical body of the parts.

4. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, In S1, both the cylindrical body and the annular disc body of the part are reserved with a finishing allowance of 0.3mm to 0.5mm more than the corresponding parts of the thin-walled disc parts.

5. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, In S2, a torque wrench is used for locking to ensure consistent clamping force.

6. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, The mandrel body of the stepped mandrel is clamped by a lathe.

7. The turning method for a thin-walled disc-shaped part as described 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 cylindrical body.

8. The turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, In S3, leave an appropriate margin when cutting to prevent thin-walled disc parts from falling directly. Finally, gently break off the thin-walled disc parts by hand and remove them.

9. A turning method for a thin-walled disc-shaped part as described in claim 1, characterized in that, The thickness of the positioning cover is greater than or equal to the wall thickness of the extended cylinder.

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