An ultra-thin head cover type part turning tool and a processing method

Abstract

The application provides a kind of super thin head cover class part turning frock and processing method, including the frock body for being fixedly connected to the opening end of super thin head cover class part;The frock body includes the first circular boss for cooperating with the opening inner wall of super thin head cover class part, multiple radial threaded holes are uniformly processed in the radial direction of first circular boss, radial threaded hole is matched with the through hole on super thin head cover class part by bolt, the large end of first circular boss is provided with second circular boss, and the large end of second circular boss is provided with third circular boss;First positioning end face is formed between the first circular boss and second circular boss, and second positioning end face is formed between the second circular boss and third circular boss.It can be used for super thin head cover class part turning processing, ensure processing precision and surface quality, solve the technical problems of super thin part clamping and "machining tremor".

Description

Technical Field

[0001] This invention relates to the field of machining technology, and mainly to a turning fixture and machining method for ultra-thin headgear-type parts. Background Technology

[0002] With the trend towards lighter designs in various equipment, many parts in the aerospace and medical device fields are now ultra-thin, significantly increasing the difficulty of machining. The headgear-type parts studied here have an outer diameter of Φ424, a length of 255, and a wall thickness of only 1.2. The acceptance standard is a wall thickness of 1.2 ± 0.05. Three batches procured using the spinning process failed to meet the acceptance standard, necessitating conventional turning to ensure the required machining accuracy. Existing machining methods suffer from the problem of machining chatter, which in turn leads to a failure to guarantee machining accuracy. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a turning fixture and machining method for ultra-thin headgear-type parts. This fixture can be used for turning ultra-thin headgear-type parts, ensuring machining accuracy and surface quality, and solving the technical problems of clamping ultra-thin parts and "machining tremor".

[0004] To achieve the above-mentioned technical features, the objective of this invention is as follows: a turning fixture for ultra-thin headgear-type parts, comprising a fixture body for fixing the open end of the ultra-thin headgear-type parts. The tooling body includes a first circular boss for mating with the inner wall of the opening of the ultra-thin headgear type part. The first circular boss has multiple radial threaded holes uniformly machined in the radial direction. The radial threaded holes are mated with the through holes on the ultra-thin headgear type part by bolts. A second circular boss is provided at the large end of the first circular boss, and a third circular boss is provided at the large end of the second circular boss. A first positioning end face is formed between the first circular boss and the second circular boss, and a second positioning end face is formed between the second circular boss and the third circular boss.

[0005] The end of the first circular boss is provided with an assembly chamfer.

[0006] The through hole is located on the outer circumference of the large end opening of the ultra-thin headgear-type part.

[0007] The end face of the tooling body is machined with multiple subtractive through holes arranged axially and evenly.

[0008] During processing, the interior of the ultra-thin headgear-like parts is filled with paraffin wax, and the paraffin wax is melted and removed after the outer circle is machined.

[0009] During processing, a washer is provided between the bolt and the tooling body.

[0010] A method for machining ultra-thin headgear-like parts by turning, wherein the machining method is implemented using the aforementioned turning fixture, and includes the following steps: Step 1, Preliminary machining of ultra-thin headgear-like parts: Roughly machine the outer circle and closed end face of ultra-thin headgear-type parts, with an allowance of 5mm~5.5mm on one side of the outer circle and 1mm~1.2mm on the closed end face. Then, turn the ultra-thin headgear-type parts and machine the open end face, inner hole and outer circle of the large end opening. Step 2, machining of radial threaded holes: On a horizontal boring machine, multiple radial threaded holes are drilled on the outer diameter of the large end opening of the ultra-thin head cover-type parts, and lines are engraved on the outer diameter with a margin. Step 3, Paraffin filling: With the opening of the ultra-thin headgear-like part facing upwards, pour molten paraffin into the ultra-thin headgear-like part. Use a lifting ring to align the fixture body into the ultra-thin headgear-like part. Check if the holes are aligned and use a feeler gauge to check if the fixture body and the surface of the ultra-thin headgear-like part are tightly fitted. Secure the ultra-thin headgear-like part with bolts and washers. Continue to add paraffin to ensure that the cavity is filled with paraffin. Step 4, Precision machining of ultra-thin headgear parts: On the CNC lathe, align the outer circle and end face reference of the fixture body, finish the end face, drill and ream the center hole of the end face, chamfer the opening of the center hole of the end face and gently support it with a center, rough and finish turn the outer circle, pay attention to the cooling of the machining to prevent the temperature from being too high and melting the paraffin. Step 5, Removal of ultra-thin headgear components: Remove the bolts, heat the ultra-thin headgear-like parts to melt the solid paraffin wax, remove them, collect the paraffin wax for preservation and reuse.

[0011] The present invention has the following beneficial effects: 1. This invention provides a turning fixture and machining method for ultra-thin headgear-type parts. This fixture can be used for turning ultra-thin headgear-type parts, ensuring machining accuracy and surface quality, and solving the technical problems of clamping ultra-thin parts and "machining tremor".

[0012] 2. To address the problem of "machining tremors", a method is adopted where sufficient allowance is left during rough turning of the outer diameter, and then the tooling is installed on the inner hole during finishing. Industrial paraffin wax is poured into the tooling cavity, and after the paraffin wax cools, it completely fills the inner wall of the workpiece, ensuring sufficient rigidity during finishing of the outer diameter.

[0013] 3. Due to the high coefficient of thermal expansion of aluminum alloy, the clearance between the outer circle of the mounting reference and the inner hole of the actual helmet machining should be between 0-0.03 mm. The tooling design also includes calibration and tool setting references. Four light-reducing holes are drilled on the tooling body to facilitate the addition of paraffin wax and the removal of melted paraffin wax. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is an overall structural diagram of the present invention.

[0016] Figure 2 This is a structural diagram of the ultra-thin headgear part of the present invention.

[0017] Figure 3 This is a structural diagram of the tooling body of the present invention.

[0018] Figure 4 This is a side view of the tooling body of the present invention.

[0019] In the diagram: 1. Ultra-thin headgear type parts; 2. Paraffin wax; 3. Large end opening outer circle; 4. Washer; 5. Bolt; 6. Radial threaded hole; 7. Tooling body; 8. Subtractive material through hole; 9. Assembly chamfer; 10. First circular boss; 11. First positioning end face; 12. Second circular boss; 13. Second positioning end face; 14. Third circular boss; 15. Through hole; 16. End face center hole. Detailed Implementation

[0020] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] Example 1: See Figure 1-4 , 1. Study the processing object and determine the processing plan: These parts are made of aluminum alloy, with tolerances for both the outer diameter and the inner hole. The wall thickness is 1.2±0.05 mm, and the surface roughness Ra varies from 1.6 to 3.2 mm. To address the clamping challenge, the workpiece is machined with the toleranced inner hole. During the finish machining of the outer diameter, the inner hole is used for positioning. Four smooth holes on the outer diameter of the workpiece are used for fixing with M5 hexagonal socket screws, eliminating clamping deformation and ensuring dimensional and positional tolerances. To address the "machining tremor" problem, sufficient allowance is left during rough machining of the outer diameter. A fixture is then installed on the inner hole during finish machining, and industrial paraffin wax is poured into the fixture cavity. After the paraffin wax cools, it completely fills the inner wall of the workpiece, ensuring sufficient rigidity during the finish machining of the outer diameter.

[0022] 2. Design and manufacture tooling: Due to the high coefficient of thermal expansion of aluminum alloy, the clearance between the outer diameter of the mounting reference and the inner hole of the actual helmet should be between 0-0.03 mm. The fixture design also includes calibration and tool setting references. Four light-reducing holes are drilled on the fixture body for adding paraffin wax and for discharging melted paraffin wax. Four M5 threaded holes are machined and engraved on the locating outer diameter to facilitate alignment during installation. For details on the fixture and clamping method, please refer to [link to details]. Figure 1 , 2 .

[0023] Example 2: A turning fixture for ultra-thin headgear-like parts includes a fixture body 7 for fixing the open end of the ultra-thin headgear-like part 1. The fixture body 7 includes a first circular boss 10 for engaging with the inner wall of the opening of the ultra-thin headgear-like part 1. The first circular boss 10 has multiple radially threaded holes 6 uniformly machined in the radial direction. These radially threaded holes 6 engage with through holes 15 on the ultra-thin headgear-like part 1 via bolts 5. A second circular boss 12 is provided at the larger end of the first circular boss 10, and a third circular boss 14 is provided at the larger end of the second circular boss 12. A first positioning end face 11 is formed between the first circular boss 10 and the second circular boss 12, and a second positioning end face 13 is formed between the second circular boss 12 and the third circular boss 14. This fixture can be used for turning ultra-thin headgear-like parts, ensuring machining accuracy and surface quality, and solving the technical problems of clamping ultra-thin parts and "machining tremor".

[0024] Furthermore, the end portion of the first circular boss 10 is provided with an assembly chamfer 9. The assembly chamfer 9 facilitates subsequent clamping.

[0025] Furthermore, the through hole 15 is provided on the outer circle 3 of the large end opening of the ultra-thin headgear part 1. The through hole 15 facilitates a reliable connection between the tooling body 7 and the ultra-thin headgear part 1.

[0026] Furthermore, the end face of the tooling body 7 is machined with a plurality of subtractive through holes 8 evenly arranged around the axis. The subtractive through holes 8 facilitate the subsequent injection of paraffin wax.

[0027] Furthermore, during processing, the interior of the ultra-thin headgear-like part 1 is filled with paraffin wax 2, and the paraffin wax 2 is melted and removed after the outer circle is machined. A tooling is then placed on the inner hole to be precision machined, and industrial paraffin wax is poured into the tooling cavity. After the paraffin wax cools, it completely fills the inner wall of the workpiece, ensuring sufficient rigidity during the precision machining of the outer circle.

[0028] Furthermore, during processing, a washer 4 is provided between the bolt 5 and the tooling body 7. The use of washer 4 ensures the reliability of the fixed installation of the tooling body 7.

[0029] Example 3: A method for machining ultra-thin headgear-like parts by turning, wherein the machining method is implemented using the aforementioned turning fixture, and includes the following steps: Step 1, Preliminary machining of ultra-thin headgear part 1: Roughly machine the outer circle and closed end face of the ultra-thin headgear type part 1, with a single-sided allowance of 5mm for the outer circle and 1mm for the closed end face. Then, adjust the surface of the ultra-thin headgear type part 1 and machine the open end face, inner hole and large end opening outer circle 3. Step 2, machining of radial threaded hole 6: On a horizontal boring machine, multiple radial threaded holes 6 are drilled on the outer circle 3 of the large end opening of the ultra-thin head cover part 1, and lines are engraved on the outer circle with a margin. Step 3, Paraffin filling: With the opening of the ultra-thin headgear part 1 facing upwards, pour molten paraffin into the ultra-thin headgear part 1. Use a lifting ring to align the fixture body 7 into the ultra-thin headgear part 1. Check if the holes are aligned and use a feeler gauge to check if the fixture body 7 and the plane of the ultra-thin headgear part 1 are tightly attached. Use bolts 5 and washers 4 to tighten the ultra-thin headgear part 1. Continue to add paraffin to ensure that the cavity is filled with paraffin 2. Step 4, finishing of ultra-thin headgear part 1: On the CNC lathe, align the outer circle and end face reference of the fixture body 7, finish the end face, drill and ream the center hole 16 of the end face, chamfer the opening of the center hole 16 of the end face and gently support it with a center, rough and finish turn the outer circle, pay attention to the cooling during processing to prevent the temperature from being too high and melting the paraffin 2. Step 5, Removal of the ultra-thin headgear component 1: Remove bolt 5, heat the ultra-thin headgear part 1 to melt the solid paraffin 2, remove it, collect the paraffin for preservation and reuse.

Claims

1. A method for turning ultra-thin headgear-like parts, characterized in that, The processing method is implemented using a turning fixture for ultra-thin headgear parts. The turning fixture includes a fixture body (7) for fixing the opening end of the ultra-thin headgear part (1). The fixture body (7) includes a first circular boss (10) for cooperating with the inner wall of the opening of the ultra-thin headgear part (1). The first circular boss (10) has multiple radial threaded holes (6) uniformly machined in the radial direction. The radial threaded holes (6) are cooperating with the through holes (15) on the ultra-thin headgear part (1) through bolts (5). A second circular boss (12) is provided at the large end of the first circular boss (10), and a third circular boss (14) is provided at the large end of the second circular boss (12). A first positioning end face (11) is formed between the first circular boss (10) and the second circular boss (12), and a second positioning end face (13) is formed between the second circular boss (12) and the third circular boss (14). The processing method includes the following steps: Step 1, Preliminary machining of ultra-thin headgear-type parts (1): Roughly machine the outer circle and closed end face of the ultra-thin headgear type part (1), wherein the outer circle is increased by 5mm~5.5mm on one side and the closed end face is increased by 1mm~1.2mm. Then, adjust the surface of the ultra-thin headgear type part (1) and machine the open end face, inner hole and large end opening outer circle (3). Step 2, machining of the radial threaded hole (6): On a horizontal boring machine, drill multiple radial threaded holes (6) on the outer circle (3) of the large end opening of the ultra-thin head cover part (1), and engrave lines on the outer circle with a margin. Step 3, Paraffin filling: With the opening of the ultra-thin headgear part (1) facing upwards, pour molten paraffin into the ultra-thin headgear part (1), use a lifting ring to align the fixture body (7) into the ultra-thin headgear part (1), check if the holes are aligned, and use a feeler gauge to check if the fixture body (7) and the plane of the ultra-thin headgear part (1) are tightly attached. Use bolts (5) and washers (4) to tighten the ultra-thin headgear part (1), and continue to add paraffin to ensure that the cavity is filled with paraffin (2). Step 4, finishing of ultra-thin headgear parts (1): On the CNC lathe, align the outer circle and end face reference of the fixture body (7), finish the end face, drill and ream the center hole (16) of the end face, chamfer the opening of the center hole (16) of the end face and gently support it with a center, rough and finish turn the outer circle, pay attention to the processing cooling to prevent the temperature from being too high and melting the paraffin (2). Step 5, Removal of the ultra-thin headgear component (1): Remove the bolts (5), heat the ultra-thin headgear-type parts (1) to melt the solid paraffin (2), and then remove and collect the paraffin for preservation and reuse.

2. The turning method for an ultra-thin headgear-like part according to claim 1, characterized in that: The end of the first circular boss (10) is provided with an assembly chamfer (9).

3. The turning method for an ultra-thin headgear-like part according to claim 1, characterized in that: The through hole (15) is provided on the outer circle (3) of the large end opening of the ultra-thin headgear type part (1).

4. The turning method for an ultra-thin headgear-like part according to claim 1, characterized in that: The end face of the tooling body (7) is machined with a plurality of subtractive through holes (8) arranged axially and evenly.

5. The turning method for an ultra-thin headgear-like part according to claim 1, characterized in that: During processing, the interior of the ultra-thin headgear-type part (1) is filled with paraffin wax (2), and the paraffin wax (2) is melted and removed after the outer circle is processed.

6. The turning method for an ultra-thin headgear-type part according to claim 1, characterized in that: During processing, a washer (4) is provided between the bolt (5) and the tool body (7).

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