A method for machining a spiral thrust collar

Abstract

The application discloses a machining method of a spiral thrust ring, and comprises the following steps: obtaining a machining process of the spiral thrust ring 3. The spiral thrust ring is made of teflon and glass fiber. The outer circle, the inner hole and the spiral groove of the bar material are coarsely machined, and then the outer circle, the inner hole and the spiral groove of the bar material are finely machined. Meanwhile, the coarsely boring cutter structure is combined. After machining, the glass fiber is not pulled out or broken from the PTFE matrix, and the surface does not leave micro concave pits and cracks, so that the product quality after machining is improved.

Description

Technical Field

[0001] This invention relates to a machining method for a helical thrust ring, belonging to the field of turning technology. Background Technology

[0002] When turning rods made of a mixture of PTFE and glass fiber to form ring parts, the addition of glass fiber with a hardness of approximately HV600 is like embedding countless tiny "bones" into the soft PTFE matrix. Existing turning processes can cause the glass fiber to be pulled out or broken from the PTFE matrix, leaving microscopic pits and cracks on the processed surface, which affects the quality of the processed product. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a method for processing a helical thrust ring.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a method for processing a helical thrust ring, comprising: a processing procedure to obtain a helical thrust ring 3.

[0006] The spiral thrust ring is made of tetrafluoroethylene and glass fiber.

[0007] The processing procedure includes material preparation and clamping steps, namely: a bar stock composed of a mixture of tetrafluoroethylene and glass fiber is clamped in a three-jaw chuck of a CNC lathe.

[0008] The processing procedure also includes a flat end face step, which involves turning the reference end of the bar stock along its axial direction.

[0009] The processing procedure also includes a roughing cycle step, which is as follows: rough turning the outer circle of the bar stock in sequence, drilling the inner hole at the end of the bar stock, rough boring the inner hole at the end of the bar stock to enlarge the hole, and rough turning the spiral groove on the outside of the bar stock in layers, leaving a finishing allowance of 0.3mm-0.4mm in each step.

[0010] When rough boring the bar stock, a rough boring tool is used, and the rake angle γ of the tool is 25° to 30°; the rake angle α of the tool 2 is 12° to 15°.

[0011] The processing procedure also includes a finishing cycle step, which is as follows: finish turning the outer circle of the bar stock with the spiral groove formed, then finish turning the spiral groove, then finish boring the inner hole, and after the remaining material of the inner hole is completely removed, wait for the bar stock to stop rotating, and then withdraw the boring bar.

[0012] The processing procedure also includes a cutting step, which involves cutting the spiral thrust ring blank from the bar stock to obtain the spiral thrust ring.

[0013] The beneficial effects of the present invention are as follows: the spiral thrust ring is a two-turn spiral structure, and both ends of the spiral thrust ring are cut into bevels, the bevels are at a radial angle of 30°±5° with the spiral thrust ring, and the flatness of the bevels themselves is not greater than 0.38; the axial projection lines of the two ends of the spiral thrust ring are parallel to the center line of the spiral thrust ring's rotation, and the parallelism is not greater than 0.38.

[0014] First, the outer circle, inner hole, and spiral groove of the bar stock are rough machined, and then the outer circle, inner hole, and spiral groove of the bar stock are precision machined. At the same time, combined with the rough boring tool structure, the processed product does not have the problem of glass fiber being pulled out or broken from the PTFE matrix, nor does it have the problem of leaving micro-pits and cracks on the surface, thus improving the quality of the processed product. Attached Figure Description

[0015] Figure 1 This is a top view schematic diagram of the spiral thrust ring of the present invention; Figure 2 This is a side view of the spiral thrust ring of the present invention; Figure 3 yes Figure 2 Enlarged view of point I in the middle; Figure 4 This is a schematic diagram of the structure for clamping the bar stock according to the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure for clamping the bar stock according to the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the structure of the cutting tool of the present invention; Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] like Figures 1 to 6 As shown.

[0018] The present application discloses a method for processing a helical thrust ring, comprising the following steps.

[0019] Step 1, Material preparation and clamping: The bar stock 1, which is composed of a mixture of PTFE and glass fiber, is clamped in the three-jaw chuck 4 of the CNC lathe (using the Japanese MAZAKQTN-200L high-precision CNC lathe).

[0020] Step 2, flatten the end face: cut the reference end of bar stock 1 along the axial direction.

[0021] Step 3, rough machining cycle: Rough turn the outer circle of bar stock 1 in sequence, drill the inner hole 12 at the end of bar stock 1, rough bore the inner hole 12 at the end of bar stock 1 to enlarge the hole, and rough turn the spiral groove 11 on the outside of bar stock 1 in layers, leaving a finishing allowance of 0.3 mm - 0.4 mm in each case.

[0022] The rough boring bar stock 1 uses a rough boring tool 2. The rake angle γ of the tool 2 is 25° to 30°, which significantly reduces the cutting force. This reduction directly leads to a decrease in the amount of elastic retraction and a reduction in cutting heat, thus alleviating the "false compliance" of dimensions and thermal deformation from the source. The rake angle α of the tool 2 is 12° to 15°, which ensures that there is sufficient clearance between the flank face of the tool 2 and the machined surface, reducing friction and compression, and preventing surface quality deterioration caused by contact between the elastic recovery and the flank face.

[0023] Step 4, finishing cycle: finish turning the outer circle of the bar stock 1 with the spiral groove 11 formed, then finish turning the spiral groove 11, and then finish boring the inner hole 12. After the remaining material of the inner hole 12 is completely removed, the spiral thrust ring blank that has not been cut off from the bar stock 1 remains in the boring bar. In order to avoid tearing of the spiral thrust ring blank, the boring bar is removed after the bar stock 1 stops rotating.

[0024] Step 5, Cutting: Cut the spiral thrust ring blank from the bar stock 1 to obtain the spiral thrust ring 3. The spiral thrust ring 3 has a two-turn spiral structure. Both ends of the spiral thrust ring 3 are cut into bevels 31. The bevels 31 and the radial direction of the spiral thrust ring 3 are at an angle of 30°±5°. The flatness of the bevels 31 is not greater than 0.38. The axial projection lines 32 of the two ends of the spiral thrust ring 3 are parallel to the center line of rotation of the spiral thrust ring 3, and the parallelism is not greater than 0.38.

[0025] The technical solution of this application adopts the method of first rough machining the outer circle, inner hole 12, and spiral groove 11 of the bar stock 1, and then fine machining the outer circle, inner hole 12, and spiral groove 11 of the bar stock 1. At the same time, combined with the structure of the rough boring tool 2, the processed product does not have the problem of glass fiber being pulled out or broken from the PTFE matrix, nor does it have the problem of leaving micro-pits and cracks on the surface, thus improving the quality of the processed product.

Claims

1. A method for processing a helical thrust ring, characterized in that, The machining process for obtaining the spiral thrust ring 3.

2. The processing method of the helical thrust ring as described in claim 1, characterized in that: The spiral thrust ring (3) is made of tetrafluoroethylene and glass fiber.

3. The processing method of the helical thrust ring as described in claim 1, characterized in that, The processing procedure includes material preparation and clamping steps, namely: a bar stock (1) composed of a mixture of tetrafluoroethylene and glass fiber is clamped in a three-jaw chuck (4) of a CNC lathe.

4. The processing method of the helical thrust ring as described in claim 3, characterized in that, The processing procedure also includes a flat end face step, which is: turning the reference end of the bar stock (1) along the axial direction.

5. The processing method of the helical thrust ring as described in claim 4, characterized in that, The processing procedure also includes a roughing cycle step, which is as follows: the outer circle of the bar stock (1) is rough turned in sequence, the inner hole (12) at the end of the bar stock (1) is drilled, the inner hole (12) at the end of the bar stock (1) is rough bored to enlarge the hole, and the spiral groove (11) on the outside of the bar stock (1) is rough turned in layers, with a finishing allowance of 0.3mm-0.4mm in each step.

6. The processing method of the helical thrust ring as described in claim 5, characterized in that, When rough boring the bar stock (1), a rough boring tool (2) is used, and the rake angle γ of the tool (2) is 25° to 30°; the rake angle α of the tool 2 is 12° to 15°.

7. The processing method of the helical thrust ring as described in claim 6, characterized in that, The processing procedure also includes a finishing cycle step, which is: finish turning the outer circle of the bar stock (1) with the spiral groove (11) formed, then finish turning the spiral groove (11), then finish boring the inner hole (12), after the remaining material of the inner hole (12) is completely removed, and after the bar stock (1) stops rotating, the boring bar is withdrawn.

8. The processing method of the helical thrust ring as described in claim 7, characterized in that, The processing procedure also includes a cutting step, which is to cut the spiral thrust ring blank and the bar stock (1) to obtain the spiral thrust ring (3).

9. The processing method of the helical thrust ring as described in claim 1 or 8, characterized in that, The spiral thrust ring (3) is a two-turn spiral structure. Both ends of the spiral thrust ring (3) are cut into inclined surfaces (31). The inclined surfaces (31) and the spiral thrust ring (31) are radially at an angle of 30°±5°. The flatness of the inclined surfaces (31) is not greater than 0.

38. The axial projection lines (32) of the two ends of the spiral thrust ring (3) are parallel to the center line of rotation of the spiral thrust ring (3), and the parallelism is not greater than 0.38.

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