Thin-wall part fixing device and turning method

Abstract

The invention discloses a thin-wall part fixing device and a turning method. The device comprises a first cylinder and a second cylinder which are fixedly connected, the first cylinder is used for being installed in a three-jaw chuck of a lathe and fixed. The second cylinder is used for fixing a to-be-machined part. The method comprises the steps that the outer circle of a to-be-machined part is clamped, the first end face of the to-be-machined part is flattened, and an inner hole with the first diameter is turned in the first end face of the to-be-machined part; the to-be-machined part is turned around, and the second end face of the to-be-machined part is flattened; a first round hole, a second round hole and a third round hole are turned in the second end face of the to-be-machined part; the inner hole of the to-be-machined part is subjected to finish turning, so that the diameter of the inner hole becomes a second diameter; wherein the second diameter is larger than the first diameter; and the to-be-machined part is fixed through the thin-wall part fixing device, and the outer circle of the to-be-machined part is turned. By means of the device, the problem of size out-of-tolerance caused by part deformation in the machining process is solved, and by means of the method, machining difficulty is low, and efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and in particular, to a fixing device for thin-walled parts and a turning machining method. Background Art

[0002] In the manufacturing industry, the machining of thin-walled parts has always been a difficult problem, especially for end-face thin-walled parts with complex machining contents. In the existing machining processes, due to the wall thickness of the parts being only 1.5 mm, there are often problems of high machining difficulty and low efficiency in the lathe working process. In addition, in the machining center process, due to the easy deformation of thin-walled parts, dimensional tolerance is easily caused during clamping, thus affecting the overall machining quality and the production efficiency of the workshop. Therefore, there is an urgent need for a new device and machining method that can improve the machining efficiency and accuracy of thin-walled parts. Summary of the Invention

[0003] An embodiment of the present invention provides a fixing device for thin-walled parts and a turning machining method to solve the problems of high machining difficulty and low efficiency caused by the thin wall thickness of parts in the prior art.

[0004] To achieve the above object, on the one hand, the present invention provides a fixing device for thin-walled parts, the device includes: a first cylinder and a second cylinder fixedly connected; the first cylinder is used to be loaded into and fixed by a three-jaw chuck of a lathe; the second cylinder is used to fix the part to be machined.

[0005] Optionally, the diameter of the first cylinder is smaller than the diameter of the second cylinder; the diameter of the second cylinder is equal to the aperture of the inner hole of the part to be machined.

[0006] Optionally, the first cylinder is fixed in the three-jaw chuck of the lathe by a three-jaw chuck wrench.

[0007] Optionally, the second cylinder is loaded into the inner hole of the part to be machined, and the second cylinder is fixedly connected to the part to be machined by a plurality of fastening screws.

[0008] Optionally, the part to be machined is of a cylindrical structure; the inner hole is provided on the first end face of the part to be machined, and a first round hole, a second round hole and a third round hole are provided on the second end face of the part to be machined; there are a plurality of the third round holes; the first round hole, the second round hole and the third round hole are respectively communicated with the inner hole; the plurality of fastening screws are respectively used to pass through the plurality of third round holes one by one and be fixedly connected to the second cylinder.

[0009] On the other hand, the present invention provides a turning processing method for thin-walled parts, which includes: S1. Clamp the outer circle of the part to be processed, level the first end face of the part to be processed, and turn a hole with a first diameter on the first end face of the part to be processed; turn the part to be processed around, and level the second end face of the part to be processed; S2. Turn a first round hole, a second round hole and a third round hole on the second end face of the part to be processed; S3. Precision-turn the inner hole of the part to be processed so that the diameter of the inner hole becomes a second diameter; wherein, the second diameter is greater than the first diameter; S4. Fix the part to be processed through a thin-walled part fixing device, and turn the outer circle of the part to be processed.

[0010] Optionally, the step of fixing the part to be processed through a thin-walled part fixing device includes: inserting the second cylinder body of the thin-walled part fixing device into the inner hole of the part to be processed after precision turning; respectively passing a plurality of fastening screws through a plurality of third round holes and fixedly connecting them with the second cylinder body.

[0011] Optionally, S1 further includes: chamfering the first end face and the second end face of the part to be processed, and the angle of the chamfer is C2.

[0012] Optionally, chamfer the orifices of the first round hole, the second round hole, the third round hole and the inner hole, and the angle of the chamfer is C1.

[0013] Optionally, after S4, it further includes: when the turning of the outer circle of the part to be processed is completed, taking out the processed part from the thin-walled part fixing device.

[0014] Advantages of the present invention:

[0015] The present invention provides a thin-walled part fixing device and a turning processing method. The device includes a first cylinder body and a second cylinder body fixedly connected; the first cylinder body is used to be inserted into the three-jaw chuck of a lathe and fixed; the second cylinder body is used to fix the part to be processed. The method includes: S1. Clamp the outer circle of the part to be processed, level the first end face of the part to be processed, and turn a hole with a first diameter on the first end face of the part to be processed; turn the part to be processed around, and level the second end face of the part to be processed; S2. Turn a first round hole, a second round hole and a third round hole on the second end face of the part to be processed; S3. Precision-turn the inner hole of the part to be processed so that the diameter of the inner hole becomes a second diameter; wherein, the second diameter is greater than the first diameter; S4. Fix the part to be processed through a thin-walled part fixing device, and turn the outer circle of the part to be processed. By designing a special thin-walled part fixing device, the present invention effectively fixes the part to be processed and reduces the problem of dimensional tolerance caused by part deformation during the processing; adopting the method of the present invention, the processing difficulty is low, the efficiency is high, and the time and cost waste caused by rework or high defective product rate are effectively reduced, thereby improving the overall production efficiency and economic benefits. Brief Description of the Drawings

[0016] Figure 1 is a side view of a thin-walled part fixing device provided by an embodiment of the present invention;

[0017] Figure 2 is a three-dimensional view of a part to be machined provided by an embodiment of the present invention;

[0018] Figure 3 is a cross-sectional view of the part to be machined after rough machining of the inner hole provided by an embodiment of the present invention;

[0019] Figure 4 is a cross-sectional view of the part to be machined after turning the round hole provided by an embodiment of the present invention;

[0020] Figure 5 is a cross-sectional view of the part to be machined after finish machining of the inner hole provided by an embodiment of the present invention;

[0021] Figure 6 is a cross-sectional view of the part to be machined after turning the outer circle provided by an embodiment of the present invention;

[0022] Figure 7 is a flowchart of a turning machining method for thin-walled parts provided by an embodiment of the present invention.

[0023] Symbol Description:

[0024] First cylinder - 1, second cylinder - 2, part to be machined - 3, inner hole - 31, first round hole - 32, second round hole - 33, third round hole - 34. Detailed Description of the Invention

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] In the manufacturing industry, the machining of thin-walled parts has always been a difficult problem, especially for end-face thin-walled parts with complex machining contents. In the existing machining process, the inner hole 31 of the part is first finish-machined to At this time, the wall thickness of the part is only 1.5 mm. Then, when machining the end-face round hole of the part, due to the thin wall of the part, problems such as great machining difficulty and low efficiency often occur in the lathe work process. In addition, in the machining center process, due to the easy deformation of the thin-walled part, dimensional over-tolerance is likely to occur during clamping, thus affecting the overall machining quality and the production efficiency of the workshop. Therefore, there is an urgent need for a new device and machining method that can improve the machining efficiency and accuracy of thin-walled parts.

[0027] Figure 1 It is a side view of a fixing device for thin-walled parts provided by an embodiment of the present invention; Figure 2 It is a three-dimensional view of the part 3 to be machined provided by an embodiment of the present invention; As Figure 1 and Figure 2 shown, the device includes:

[0028] A first cylinder 1 and a second cylinder 2 fixedly connected;

[0029] The first cylinder 1 is used to be loaded into the three-jaw chuck of the lathe and fixed; the second cylinder 2 is used to fix the part 3 to be machined.

[0030] In a specific embodiment of the present invention, the first cylinder 1 is Φ100mm and can be installed in the three-jaw chuck of the lathe to ensure that the device is firmly fixed on the lathe. By using a three-jaw chuck wrench, the first cylinder 1 is firmly fixed in the three-jaw chuck of the lathe to ensure that the device does not loosen during the turning process.

[0031] The second cylinder is used to fix the thin-walled part to be machined to ensure that the part 3 to be machined does not move or deform during the machining process. In a specific embodiment of the present invention, the second cylinder 2 is inserted into the inner hole 31 of the part 3 to be machined, and then the second cylinder 2 and the part 3 to be machined are fixedly connected by a plurality of fastening screws. This design helps to maintain the stability and accuracy of the part 3 to be machined during the machining process. The diameter of the second cylinder 2 is equal to the diameter of the inner hole 31 of the part 3 to be machined to ensure that the part 3 to be machined can be firmly assembled into the device.

[0032] The following is illustrated by a specific embodiment:

[0033] First, the inner hole 31 of the part 3 to be machined is rough-machined to Φ96mm, and then the inner hole 31 of the part 3 to be machined is finish-machined to Φ106mm. The second cylinder 2 is Φ106mm. At this time, the second cylinder 2 is inserted into the inner hole 31 of the part 3 to be machined after finish machining, and the two are fixedly connected by a plurality of fastening screws.

[0034] Among them, the diameter of the first cylinder 1 is 100mm, the diameter of the second cylinder 2 is 106mm, and the diameter of the first cylinder 1 is smaller than the diameter of the second cylinder 2; the diameter of the first cylinder 1 is smaller and is suitable for being tightly fixed in the three-jaw chuck of the lathe, while the diameter of the second cylinder 2 is equal to the diameter of the inner hole 31 of the part 3 to be machined after finish machining to ensure that the part 3 to be machined can be firmly assembled into the device.

[0035] In an alternative embodiment, the part 3 to be machined is of a cylindrical structure; the inner hole 31 is provided on the first end face of the part 3 to be machined, and a first round hole 32, a second round hole 33 and a third round hole 34 are provided on the second end face of the part 3 to be machined; a plurality of the third round holes 34 are provided; in a specific embodiment of the present invention, one first round hole 32 is provided, one second round hole 33 is also provided, and a plurality of the third round holes 34 are provided, three in the present invention; wherein, the first round hole 32 is The second round hole 33 is Φ16.5, and the third round hole 34 is Φ4.2.

[0036] The first round hole 32, the second round hole 33 and the third round hole 34 communicate with the inner hole 31 respectively; the plurality of fastening screws are respectively used to pass through the plurality of third round holes 34 one by one and fixedly connect with the second cylinder 2. In a specific embodiment of the present invention, the model of the fastening screw is M4, three fastening screws are provided, and the three fastening screws pass through the three third round holes 34 one by one and are threadedly connected with the second cylinder 2 to ensure the stability during the machining process.

[0037] Figure 7 is a flowchart of a turning machining method for a thin-walled part provided by an embodiment of the present invention, as Figure 7 shown, the method includes:

[0038] S1. Clamp the outer circle of the part 3 to be machined, level the first end face of the part 3 to be machined, and turn out the inner hole 31 with a first diameter on the first end face of the part 3 to be machined; turn the part 3 to be machined around, and level the second end face of the part 3 to be machined;

[0039] Figure 3 is a cross-sectional view of the part 3 to be machined after rough machining the inner hole 31 provided by an embodiment of the present invention; as Figure 3 shown, the rough machining of the inner hole 31 means turning out the inner hole 31 with a first diameter.

[0040] "Clamp the outer circle" means using the fixture of the lathe (usually a three-jaw chuck) to clamp the outer cylindrical surface of the part 3 to be machined. By clamping the outer circle, the part 3 to be machined is fixed on the lathe to ensure that the part 3 to be machined will not loosen during the machining process. This step is an important prerequisite for ensuring the stable fixation of the part 3 to be machined.

[0041] "Level the first end face" means using the turning tool of the lathe to machine the first end face of the part 3 to be machined to be flat. This is to make the end face smooth, burr-free, and perpendicular to the axis. The main purpose of this step is to provide an accurate reference surface for subsequent machining, thereby ensuring the overall machining accuracy.

[0042] "Boring the inner hole 31" means using a lathe to machine the inner hole 31 of the workpiece 3 to be processed. In a specific embodiment of the present invention, the inner hole 31 is bored to Φ96mm; the diameter of the inner hole 31 is machined to 96mm. Here, "Φ96mm" indicates that the diameter of the inner hole 31 is 96mm. This step requires the cutting tool of the lathe to extend into the interior of the workpiece 3 to be processed for inner diameter machining to ensure that the inner hole 31 meets the designed dimensional requirements (i.e., the first diameter).

[0043] After boring the inner hole 31 with the first diameter, turn the outer diameter to Φ109.5mm. "Turning the outer diameter to Φ109.5mm" means using a lathe to machine the outer diameter of the workpiece 3 to be processed, and machining the outer diameter to 109.5mm. Here, "Φ109.5mm" indicates that the diameter of the outer circle is 109.5mm. This step ensures that the outer diameter of the workpiece 3 to be processed reaches the specified size, the outer surface is smooth, and is concentric with the inner hole 31.

[0044] "Reversing" means that after completing the machining of one end, the workpiece 3 to be processed is taken out of the fixture and flipped 180 degrees, and then re-clamped at the other end for machining. The purpose of this step is to machine the other end face of the workpiece 3 to be processed and ensure that the axial dimension of the entire workpiece 3 to be processed is consistent.

[0045] "Flattening the second end face" is similar to the previous "flattening the first end face" operation. The purpose is to machine the other end face of the workpiece 3 to be processed to be flat and perpendicular to the axis. This step is to ensure that the two end faces of the workpiece 3 to be processed are parallel and symmetrical, which helps to improve the overall accuracy and appearance quality of the workpiece 3 to be processed.

[0046] The said S1 further includes:

[0047] Ensuring the total length. "Ensuring the total length" means that after completing the above steps, ensuring that the total length of the workpiece 3 to be processed meets the design requirements. Through precise turning and measurement, ensure that the total length of the machined part is within the specified tolerance range, neither too long nor too short.

[0048] Perform chamfering on the first end face and the second end face of the workpiece 3 to be processed, and the angle of the chamfer is C2.

[0049] "Chamfer C2" means performing chamfering treatment on the edge of the workpiece 3 to be processed, and the angle or size of the chamfer is marked as C2. Chamfering is usually used to remove the acute angle at the edge of the workpiece 3 to be processed to prevent burrs from being generated during subsequent operations, and to enhance the assembly and safety of the workpiece 3 to be processed. Specifically, "C2" represents the size of the chamfer, and corresponding treatment is carried out according to the drawing or design requirements.

[0050] S2. Bore the first round hole 32, the second round hole 33 and the third round hole 34 on the second end face of the workpiece 3 to be processed;

[0051] Figure 4 is a cross-sectional view of the part to be machined 3 after turning the round hole; as Figure 4 shown,

[0052] In a specific embodiment, the first round hole 32 is provided as one, and the size of the first round hole 32 is indicating that the hole diameter is 96 mm, and the upper deviation is +0.19 mm, and the lower deviation is 0 mm. This means that the diameter of the first round hole 32 can be between 96 and 96.19 mm.

[0053] The second round hole 33 is provided as one, and the size of the second round hole 33 is Φ16.5 mm, indicating that the hole diameter is 16.5 mm.

[0054] The third round holes 34 are provided as three, and the sizes of the three third round holes 34 are all Φ4.2 mm, indicating that there are three holes with a diameter of 4.2 mm on the second end face.

[0055] Turn chamfers at the orifices of the first round hole 32, the second round hole 33, and the third round holes 34, and the angle of the chamfer is C1.

[0056] The orifices of all round holes need to be chamfered to remove sharp corners and burrs, improve the smoothness of the orifices and the assemblability of the parts. Chamfers can generally prevent damage to parts or fasteners during the assembly process and help guide other parts or tools.

[0057] S3. Precision turn the inner hole 31 of the part to be machined 3 so that the diameter of the inner hole 31 becomes the second diameter; wherein, the second diameter is greater than the first diameter;

[0058] Figure 5 is a cross-sectional view of the part to be machined 3 after precision machining the inner hole 31 provided by the embodiment of the present invention; as Figure 5 shown,

[0059] In a specific embodiment, the second diameter is which means that the diameter of the inner hole 31 is precision machined to 106 mm, and it is required that the upper deviation of the hole diameter is +0.22 mm and the lower deviation is 0 mm. This means that the diameter of the inner hole 31 can be between 106 mm and 106.22 mm. Since this is a precision turning process, it is required that the size of the machined hole diameter is very precise, and usually high-precision turning tools and equipment are needed to complete it.

[0060] Perform a turning chamfer on the orifice of the inner hole 31, and the angle of the chamfer is C1. "Orifice chamfer C1" means performing a chamfering treatment on the orifice of the inner hole 31 after precision turning, and C1 represents the specific size or angle of the chamfer. The purpose of this step is to remove the acute angle at the edge of the inner hole 31 to make it smoother, prevent scratching other parts during assembly or affecting the assembly quality. It should be noted that chamfering can not only improve the appearance quality of the part, but also improve the functionality and assembly of the part, avoid jamming during installation, and help prevent stress concentration in the part during use, thereby extending the service life.

[0061] S4. Fix the part to be machined 3 through the thin-walled part fixing device, and turn the outer circle of the part to be machined 3.

[0062] Figure 6 is a cross-sectional view of the part to be machined 3 after turning the outer circle provided by the embodiment of the present invention; as Figure 6 shown,

[0063] The fixing of the part to be machined 3 through the thin-walled part fixing device includes:

[0064] Insert the second cylinder 2 of the thin-walled part fixing device into the inner hole 31 of the part to be machined 3 after precision turning;

[0065] Pass a plurality of fastening screws respectively through a plurality of third round holes 34 and fixedly connect them with the second cylinder 2 one by one.

[0066] In a specific embodiment, insert the first cylinder 1 (with a diameter of 100 mm) of the thin-walled part fixing device into the three-jaw chuck of the lathe, and use a special three-jaw chuck wrench to tighten the three-jaw chuck so that the thin-walled part fixing device is firmly fixed on the lathe. During the fastening process, it is necessary to ensure that the device is firm and will not loosen or shift during the machining process.

[0067] Insert the second cylinder 2 (with a diameter of 106 mm) of the thin-walled part fixing device into the inner hole 31 (which is ) of the part to be machined 3 after precision turning; the inner hole 31 of the part to be machined 3 after precision turning matches the second cylinder 2, so as to achieve a tight clamping. After inserting the part to be machined 3, gently rotate the part to be machined 3 so that the third round holes 34 of the part to be machined 3 are aligned with the threaded holes of the second cylinder 2. There are three third round holes 34 (3-Φ4.2) with a diameter of 4.2 mm on the end face of the part to be machined 3, which need to be aligned with the three M4 threaded holes (3-M4) on the second cylinder 2. Pass the three fastening screws through the 3-Φ4.2 third round holes 34 of the part to be machined 3 one by one and screw them into the 3-M4 threaded holes of the second cylinder 2 of the device, and use the fastening screws to fix the part to be machined 3 on the second cylinder 2 of the device to ensure that the part to be machined 3 will not loosen or move during subsequent machining.

[0068] After all clamping steps are completed, start the lathe and prepare for turning to finish turning the outer diameter of the workpiece. Perform the turning operation on the outer diameter of the workpiece, machining the outer diameter of the workpiece 3 to 109 mm and controlling the tolerance between -0.18 mm and -0.4 mm. This means that the final outer diameter should be between 108.6 mm and 108.82 mm. During the turning process, ensure the surface finish and dimensional accuracy and avoid excessive errors.

[0069] After the step S4, the following steps are further included:

[0070] After the turning of the outer diameter of the workpiece 3 is completed, take out the machined workpiece from the thin-walled workpiece fixing device.

[0071] In an optional embodiment, after the turning of the outer diameter of the workpiece 3 is successfully completed, use a suitable tool (such as a screwdriver or a wrench) to loosen and remove the fastening screws that were previously used to fix the workpiece 3 one by one; after all the fastening screws are removed, gently take out the workpiece from the thin-walled workpiece fixing device. Since the outer diameter of the workpiece has been accurately machined to the designed size after turning, it should be handled with care during removal to avoid knocking or damaging the machined surface.

[0072] Advantages of the present invention:

[0073] (1) Improve machining accuracy: By designing a special thin-walled workpiece fixing device, the present invention effectively fixes the workpiece 3, reducing the problem of dimensional tolerance caused by workpiece deformation during the machining process. Especially in precision machining, it can significantly improve machining accuracy and ensure the final quality of the workpiece.

[0074] (2) Enhance machining stability: By inserting the second cylinder 2 into the inner hole 31 of the workpiece 3 and using multiple fastening screws to fix the workpiece, the stability of the workpiece during the machining process is greatly improved, avoiding machining errors caused by vibration or loosening.

[0075] (3) Simplify the operation process: The machining method provided by the present invention is clear and concise, and the operation steps are easy to execute, reducing the operation complexity. By performing turning in stages and adopting reasonable chamfering treatment, operation errors can be reduced and machining efficiency can be improved.

[0076] (4) Strong adaptability: The device and method of the present invention are applicable to different types of thin-walled workpieces, especially workpieces with complex end face structures. Whether for small-batch customized machining or large-batch production, the present invention can provide good solutions and has a wide application prospect.

[0077] (5) Improve production efficiency: Through precise part fixation and a stable machining process, the present invention effectively reduces the waste of time and cost caused by rework or a high defective rate, thereby improving the overall production efficiency and economic benefits.

[0078] (6) Reduce machining stress: Since the present invention reduces the stress generated by parts during the machining process through a firm clamping method, it avoids the deformation or damage of thin-walled parts caused by stress concentration, thereby extending the service life of the machining equipment and tools.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fixing device for thin-walled parts, characterized in that, Comprising: A first cylinder and a second cylinder fixedly connected; The first cylinder is used to be loaded into and fixed by the three-jaw chuck of a lathe; the second cylinder is used to fix the part to be machined.

2. The device according to claim 1, wherein: The diameter of the first cylinder is smaller than the diameter of the second cylinder; The diameter of the second cylinder is equal to the inner diameter of the part to be machined.

3. The device according to claim 2, wherein: The first cylinder is fixed in the three-jaw chuck of the lathe by a three-jaw chuck wrench.

4. The device according to claim 3, wherein: The second cylinder is inserted into the inner hole of the part to be machined, and the second cylinder is fixedly connected to the part to be machined by a plurality of fastening screws.

5. The device according to claim 4, wherein: The part to be machined is of a cylindrical structure; the inner hole is provided at the first end face of the part to be machined, and a first round hole, a second round hole and a third round hole are provided at the second end face of the part to be machined; there are a plurality of the third round holes; The first round hole, the second round hole and the third round hole communicate with the inner hole respectively; the plurality of fastening screws are respectively used to pass through the plurality of third round holes one by one and are fixedly connected to the second cylinder.

6. A turning machining method for thin-walled parts, characterized in that, Comprising: S1. Clamp the outer circle of the part to be machined, level the first end face of the part to be machined, and turn an inner hole with a first diameter on the first end face of the part to be machined; turn the part to be machined around, and level the second end face of the part to be machined; S2. Turn a first round hole, a second round hole and a third round hole on the second end face of the part to be machined; S3. Precision-turn the inner hole of the part to be machined so that the diameter of the inner hole becomes a second diameter; wherein, the second diameter is larger than the first diameter; S4. Fix the part to be machined by a thin-wall part fixing device, and turn the outer circle of the part to be machined.

7. The method according to claim 6, wherein The fixing of the part to be machined by the thin-wall part fixing device includes: Insert the second cylinder of the thin-wall part fixing device into the inner hole of the part to be machined after precision turning; Pass a plurality of fastening screws through the plurality of third round holes one by one and fixedly connect them to the second cylinder.

8. The method according to claim 6, wherein The S1 further includes: Perform chamfering on the first end face and the second end face of the part to be machined, and the angle of the chamfer is C2.

9. The method according to claim 6, wherein: Perform chamfering on the orifices of the first round hole, the second round hole, the third round hole and the inner hole, and the angle of the chamfer is C1.

10. The method according to claim 6, characterized in that After the S4, it further includes: When the turning of the outer circle of the part to be machined is completed, take out the machined part from the thin-wall part fixing device.

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