Special clamp and method for machining supporting plate of sphere

Abstract

The invention provides a special fixture and method for machining a supporting plate of a sphere, the fixture comprises a rectangular sphere duplicating body, the distance between mounting surfaces on two sides of the sphere duplicating body is equal to the distance between supporting surfaces of the sphere, each mounting surface is provided with a detachable positioning part and a fixing clamp, the rear end of each mounting surface is sequentially connected with an abutting part and a fixing part, and the fixing part is connected with a machine tool spindle chuck; the distance between the abutting face and the axis of the positioning part is equal to that between the center of the supporting plate and the to-be-machined end face. During machining, the supporting plate is fixed to a mounting face, a machine tool spindle drives the clamp to rotate, and the drilling cutter sequentially machines end face connecting holes. The clamp ensures that the four connecting holes in the same end face of the two supporting plates are located in the same circumference by copying the ball installation reference, solves the problem that traditional machining and positioning precision is insufficient, is high in machining precision and is suitable for batch machining of the ball valve supporting plates.

Description

Technical Field

[0001] The present invention relates to the technical field of processing a support plate for a sphere of a ball valve, and particularly relates to a special fixture and method for processing the support plate of the sphere. Background Art

[0002] The ball valve support plate is a structure inside the ball valve for supporting the sphere. The support plate bears the role of supporting the sphere to ensure that the sphere can rotate and seal stably during the opening and closing processes of the valve.

[0003] Reference Figure 1 And Figure 2 , two side surfaces of the sphere 01 form support surfaces 04, two support plates 02 are connected to the support surfaces 04, and positioning holes 03 for connecting with the valve body are respectively arranged on two end faces of the support plates 02. Specifically, two positioning holes 03 are arranged on the end face of the support plate 02, so that four positioning holes 03 are formed on the end faces of the same ends of the two support plates 02, and these four positioning holes 03 need to be accurately located on the same circumference.

[0004] In the existing processing technology, for the processing of the positioning holes 03 on the support plate 02, there are often no effective fixtures and processing methods specifically for ensuring that the four positioning holes 03 are located on the same circumference. The traditional processing methods have problems such as insufficient positioning accuracy and large processing errors, and it is difficult to ensure the position accuracy of the four positioning holes 03 on the circumference. This lack of processing accuracy will affect the stability and sealing performance during the assembly of the ball valve, and may further lead to failures such as leakage during the use of the ball valve, reducing the service performance and reliability of the ball valve. Therefore, how to ensure that the four positioning holes 03 on the support plate 02 are located on the same circumference during the processing becomes a technical problem to be solved.

[0005] The prior art relatively close to the present application: Application No. CN201721711077.5, titled A Turning Fixture for a Ball Valve Support Plate. Summary of the Invention

[0006] In view of the problems pointed out in the background art, the present invention proposes a special fixture and method for processing the support plate of the sphere to solve the above technical problems.

[0007] The technical solution of the present invention is realized as follows: A special fixture for processing the support plate of the sphere, two support plates are installed on two support surfaces of the sphere, including a sphere replica. Installation surfaces are respectively arranged on the left and right sides of the sphere replica, the distance between the two installation surfaces is equal to the distance between the two support surfaces, cylindrical positioning parts connected to the through holes at the centers of the support plates are arranged on the installation surfaces, and fixing clamps for fixing the support plates are arranged on the installation surfaces; The rear end of the sphere replica is connected with an abutting part, the rear end of the abutting part is connected with a fixing part, the abutting part is provided with an abutting surface that can abut against the support plate, the abutting surface is perpendicular to the installation surface, and the distance from the abutting surface to the central axis of the positioning part is equal to the distance from the center of the support plate to its end face to be machined; The central axis of the fixing part intersects the central axis of the positioning part perpendicularly, and the central axis of the fixing part is located in the middle position between the two installation surfaces; in the front-rear direction, the length of the support plate is equal to or less than the length of the sphere replica.

[0008] The present invention is further configured such that a groove is provided on the installation surface, and the positioning part is detachably connected in the groove.

[0009] The present invention is further configured such that a threaded hole is provided at the bottom of the groove, and a through hole corresponding to the threaded hole is provided on the positioning part; the fixing clamp is strip-shaped, a connection hole corresponding to the through hole is provided on the fixing clamp, and a bolt is connected in the connection hole.

[0010] The present invention is further configured such that the positioning part includes a connecting section and a positioning section arranged coaxially, the connecting section is adaptively connected with the groove, and the positioning section is connected with the support plate.

[0011] The present invention is further configured such that the sphere replica is of a rectangular body structure, the abutting part and the fixing part are both of a cylindrical structure, and the diameter of the abutting part is greater than the diameter of the fixing part.

[0012] A method for machining a support plate of a sphere includes the following steps: Step S1, manufacturing the above-mentioned sphere replica; Step S2, fixedly installing the fixing part of the sphere replica in the spindle chuck on the machine tool; Step S3, taking the manufactured support plate, the support plate is of a rectangular body structure, and a through hole adapted to be connected with the positioning part is provided at the center of the support plate; Step S4, installing the support plate on the installation surface and fixing the support plate through a fixing clamp, and the rear end face of the support plate abuts against the abutting surface; Step S5, using a drilling tool to drill the front end face of the support plate; the spindle of the machine tool drives the sphere replica to rotate, so that four positions on the two support plates where holes need to be machined are sequentially rotated to the positions corresponding to the drilling tool; during machining, the sphere replica stops rotating, and the drilling tool feeds towards the support plate, and the feeding direction of the drilling tool is the spindle axis direction; Step S6, completing the machining and removing the support plate from the machine tool.

[0013] Adopting the above technical solution, the beneficial effect of the present invention is: The core of this fixture is to construct an installation and positioning reference that is completely equivalent to the ball valve sphere through the sphere replica.

[0014] The special fixture for processing the support plate of the sphere provided by the present invention is provided with a sphere replica having the same installation position and size as that of the sphere of the ball valve. In this way, when the support plate is installed on the sphere replica for processing, it is equivalent to installing it on the sphere of the ball valve for processing, ensuring that the four positioning holes processed on the end face of the support plate are located on the same circumference and the processing accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Structural schematic of the connection between the existing sphere and the support plate Figure 1 。

[0017] Figure 2 Structural schematic of the connection between the existing sphere and the support plate Figure 2 。

[0018] Figure 3 Structural schematic of the fixture of the present invention.

[0019] Figure 4 Exploded schematic of the fixture of the present invention.

[0020] Figure 5 Cross-sectional view of the fixture of the present invention. Figure 6 Structural schematic of the fixture of the present invention Figure 2 。

[0021] Figure 7 Structural schematic of the front-end processing surface of the support plate of the present invention.

[0022] Explanation of the reference numerals in the drawings: sphere 01, support plate 02, positioning hole 03, support surface 04, sphere replica 1, installation surface 2, through hole 3, positioning portion 4, fixed clamp 5, abutting portion 6, fixing portion 7, abutting surface 8, groove 9, threaded hole 10, perforation 11, connection hole 12, bolt 13, connection section 14, positioning section 15. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The following reference Figures 1-7 will illustrate the present invention: Embodiment: The core of this fixture lies in constructing an installation and positioning reference that is completely equivalent to the ball valve sphere 01 through the sphere replica 1.

[0025] A special fixture for processing the support plate of a sphere, where the sphere 01 is installed inside the ball valve, and two support plates 02 are installed on two support surfaces 04 of the sphere 01.

[0026] It includes a sphere replica 1, and the sphere replica 1 is of a rectangular structure. Installation surfaces 2 are respectively formed on the left and right sides of the sphere replica 1, and the distance between the two installation surfaces 2 is equal to the distance between the two support surfaces 04. The support plate 02 is installed on the installation surface 2. This dimensional consistency ensures that the installation position of the support plate 02 is exactly the same as the actual working condition, providing an accurate spatial positioning basis for subsequent processing.

[0027] A cylindrical positioning portion 4 adapted to be connected to the through hole 3 at the center of the support plate 02 is provided on the installation surface 2. The positioning portion 4 is inserted into the through hole 3 by means of interference fit or clearance fit, and the high-precision fit of the cylindrical surface is used to realize the radial positioning of the support plate 02 on the installation surface 2, ensuring that the central axis of the support plate 02 is strictly coaxial with the central axis of the positioning portion 4, and eliminating the angular deviation during the installation of the support plate 02.

[0028] A fixing clamp 5 for fixing the support plate 02 is provided on the installation surface 2. The support plate 02 on the installation surface 2 is fixed by the fixing clamp 5. The fixing clamp 5 firmly fixes it on the installation surface 2 by applying a clamping force to the support plate 02. This fixing method can effectively prevent the support plate 02 from generating displacement or vibration during the processing, ensure the position stability of the support plate 02 during the processing, and avoid the hole position processing deviation caused by insecure fixing.

[0029] A butt joint portion 6 is connected to the rear end of the sphere replica 1, and a fixing portion 7 is connected to the rear end of the butt joint portion 6. Both the butt joint portion 6 and the fixing portion 7 are of a cylindrical structure, the butt joint portion 6 and the fixing portion 7 are coaxially arranged, and the diameter of the butt joint portion 6 is larger than the diameter of the fixing portion 7. The fixing portion 7 is fixedly connected to the spindle chuck on the machine tool. This stepped design not only facilitates the butt joint surface 8 to tightly abut against the rear end of the support plate 02, but also firmly installs the fixture on the machine tool through the rigid connection between the fixing portion 7 and the machine tool spindle chuck.

[0030] The abutting portion 6 is provided with an abutting surface 8 that can abut against the rear end of the support plate 02, and the abutting surface 8 is perpendicular to the mounting surface 2. This ensures the spatial perpendicularity between the positioning reference of the support plate 02 in the front-rear direction and the mounting surface 2.

[0031] The distance from the abutting surface 8 to the central axis of the positioning portion 4 is equal to the distance from the center of the support plate 02 to the to-be-machined end faces at its front and rear ends. This dimensional matching enables the rear end of the support plate 02 to be in a state of abutting against the abutting surface 8 after the support plate 02 is mounted on the mounting surface 2. In this way, when the support plate 02 is under drilling machining, the forces borne by the support plate 02 in the machining direction can be shared by the abutting portion 6 and the positioning portion 4.

[0032] The central axis of the fixing portion 7 intersects perpendicularly with the central axis of the positioning portion 4, and the central axis of the fixing portion 7 is located at the middle position between the two mounting surfaces 2. This spatial layout enables the support plates 02 on the two mounting surfaces 2 to form a symmetric circumferential machining trajectory with the central axis of the fixing portion 7 as the rotation center when the fixture rotates driven by the machine tool spindle. When the machine tool spindle drives the fixture to rotate, the machining positions of the four positioning holes 03 are naturally on the same circumference centered on the central axis of the fixing portion 7, directly ensuring the circumferential distribution accuracy of the four positioning holes 03 from the aspect of the fixture structure design.

[0033] In the front-rear direction, the length of the support plate 02 is equal to or less than the length of the sphere replica 1. This can prevent the front end of the support plate 02 from protruding beyond the sphere replica 1 during machining, eliminate the potential machining vibration hazards caused by an overly long cantilever, ensure the structural stability of the support plate 02 during the machining process, and further improve the machining accuracy of the positioning holes 03.

[0034] Through the equivalent design of the dimensions of the sphere replica 1, the precise coaxial positioning of the positioning portion 4, the rigid clamping of the fixed clamp 5, the sharing of machining forces by the abutting portion 6, the machine tool connection and positioning of the fixing portion 7, and the dimensional matching relationships among various structures, this fixture constructs a complete machining positioning system. From installation and positioning, fixed support to machine tool connection, each link is designed to meet the technical requirement of ensuring that the four positioning holes 03 are located on the same circumference, making the spatial position of the support plate 02 during machining exactly the same as its actual assembly state, fundamentally solving the problem of insufficient circumferential distribution accuracy of hole positions in traditional machining from the aspect of the fixture structure, and achieving high-precision machining of the positioning holes 03.

[0035] The mounting surface 2 is provided with a groove 9, and the positioning portion 4 is detachably connected in the groove 9. The groove 9 provides a detachable mounting base for the positioning portion 4.

[0036] The positioning portion 4 includes a connecting section 14 and a positioning section 15 arranged coaxially. The connecting section 14 is adaptively connected to the groove 9, and the positioning section 15 is connected to the support plate 02.

[0037] This structural design enables the positioning part 4 to be replaced according to the processing requirements of support plates 02 of different specifications. The shape of the groove 9 is precisely adapted to the connecting section 14 of the positioning part 4, ensuring that the positioning part 4 is perpendicular and coaxial with the mounting surface 2 after installation, thus ensuring the stability of the positioning reference. The threaded hole 10 at the bottom of the groove 9, the perforation 11 of the positioning part 4, and the connecting hole 12 of the fixing clamp 5 form a bolt connection channel. This three-in-one connection structure rigidly fixes the support plate 02, the fixing clamp 5, and the positioning part 4 on the mounting surface 2.

[0038] The positioning part 4 adopts a segmented structural design with a connecting section 14 and a positioning section 15 arranged coaxially. The mating connection between the connecting section 14 and the groove 9 can adopt a transition fit or a small interference fit to ensure that the positioning part 4 will not loosen due to processing vibration after installation, and at the same time is convenient for disassembly and replacement; the positioning section 15 and the through hole 3 in the center of the support plate 02 adopt a clearance fit or an interference fit, and its diameter size is designed according to the accuracy requirements of the through hole 3 of the support plate 02, and the radial positioning of the support plate 02 is realized through the cylindrical surface fit. This segmented design not only satisfies the reliable connection between the positioning part 4 and the mounting surface 2, but also ensures the accurate positioning of the support plate 02, and is convenient for replacing the positioning section 15 according to the through hole sizes of different support plates 02, improving the versatility of the fixture.

[0039] The bottom of the groove 9 is provided with a threaded hole 10, and the positioning part 4 is provided with a perforation 11 corresponding to the threaded hole 10; the fixing clamp 5 is strip-shaped, and the fixing clamp 5 is provided with a connecting hole 12 corresponding to the perforation 11, and a bolt 13 is connected in the connecting hole 12. The bolt 13 is in screw-threaded engagement with the threaded hole 10 to fix the support plate 02 on the mounting surface 2.

[0040] As a strip-shaped structure, the length of the fixing clamp 5 covers the fixing area of the support plate 02. Through the screw-threaded engagement between the bolt 13 and the threaded hole 10, the support plate 02 is pressed tightly on the mounting surface 2. The bolt 13 passes through the connecting hole 12 of the fixing clamp 5 and the perforation 11 of the positioning part 4 in sequence and then engages with the threaded hole 10. The clamping force generated by this connection method can be evenly distributed on the fixing surface of the support plate 02. When the bolt 13 is tightened, the fixing clamp 5 forms a downward pressing force on the support plate 02, and at the same time the positioning part 4 forms an upward supporting force on the support plate 02. The two act together to make the support plate 02 closely fit the mounting surface 2, effectively preventing displacement or vibration caused by cutting force during the processing.

[0041] A method for processing a support plate of a sphere includes the following steps: Step S1: Manufacture the above-mentioned sphere replica 1; this step needs to be processed strictly according to the actual installation dimension parameters of the ball valve sphere 01 to ensure that in the rectangular body structure of the sphere replica 1, the distance between the left and right mounting surfaces 2 is exactly the same as the distance between the two support surfaces 04 of the sphere 01. The flatness tolerance of the mounting surface 2 needs to be controlled within 0.02 mm to ensure the fitting accuracy when the support plate 02 is installed. The machining of the groove 9 of the positioning part 4 needs to ensure that the perpendicularity error between its axis and the mounting surface 2 does not exceed 0.01 mm, and the machining accuracy of the threaded hole 10 needs to reach grade 6H to ensure the reliability of subsequent bolt connections. The material selection of the sphere replica 1 needs to consider wear resistance and rigidity, usually 45# steel is used and quenched and tempered, and the hardness is controlled at HRC28 - 32 to meet the long-term processing and use requirements.

[0042] Step S2: Fix the fixing part 7 of the sphere replica 1 on the spindle chuck of the machine tool; when installing the fixing part 7 onto the machine tool spindle chuck, it is necessary to calibrate the radial runout of the outer circle of the fixing part 7 through a dial indicator to ensure that the runout is ≤ 0.015 mm, and at the same time calibrate the axial circular runout of the end face of the abutting part 6 ≤ 0.01 mm to ensure the coaxiality of the fixture rotation axis and the machine tool spindle axis.

[0043] Step S3: Take the manufactured support plate 02, the support plate 02 is of rectangular body structure, and a through hole 3 adapted to be connected with the positioning part 4 is provided at the center of the support plate 02; as the part to be processed, the length and width dimension tolerances of the rectangular body structure of the support plate 02 need to be controlled within ±0.1 mm, and the thickness dimension tolerance is ±0.05 mm to ensure the fitting degree with the mounting surface 2 during installation. The machining accuracy of the central through hole 3 needs to reach grade H7, and the hole diameter tolerance is determined according to the diameter of the positioning section 15 of the positioning part 4. Usually, a clearance fit (such as H7 / g6) is adopted, and the fit clearance is controlled within 0.01 - 0.03 mm, which not only ensures the positioning accuracy when the support plate 02 is installed but also facilitates loading and unloading.

[0044] Step S4: Install the support plate 02 on the mounting surface 2 and fix the support plate 02 through the fixing clamp 5, and the rear end face of the support plate 02 abuts against the abutting surface 8; during installation, align the through hole 3 of the support plate 02 with the positioning section 15 of the positioning part 4, and through slight pressing, the cylindrical surface fit is achieved between the two. At this time, the rear end face of the support plate 02 needs to be completely fitted with the abutting surface 8, and the fitting clearance ≤ 0.02 mm to ensure the positioning accuracy of the support plate 02 in the front and rear directions. The installation of the fixing clamp 5 needs to ensure that its long strip structure is parallel to the long side of the support plate 02. When the bolt 13 passes through the connecting hole 12 and the perforation 11, it needs to be tightened in a diagonal and uniform manner, and gradually reach the specified tightening torque in 2 - 3 steps, so that the fixing clamp 5 generates a uniform pressing force on the support plate 02 to avoid deformation of the support plate 02 caused by uneven clamping force.

[0045] Step S5: Use a drilling tool to drill the front end face of the support plate 02 to machine the positioning holes 03. The main shaft of the machine tool drives the sphere replica 1 to rotate, so that the four positions on the two support plates 02 where holes need to be machined are sequentially rotated to the positions corresponding to the drilling tool. During machining, the sphere replica 1 stops rotating, and the drilling tool feeds towards the support plate 02. The feeding direction of the drilling tool is the axis direction of the main shaft. The selection of the drilling tool needs to be determined according to the diameter of the positioning hole 03. Usually, a high-speed steel twist drill or a carbide drill bit is used. The cutting edge of the drill bit needs to be sharp and the symmetry error ≤ 0.02 mm to ensure the drilling accuracy. During machining, the main shaft of the machine tool drives the sphere replica 1 to rotate, and the rotation angle is set through the numerical control system, so that the four positions to be machined on the two support plates 02 are sequentially rotated to the positions corresponding to the drilling tool. When the sphere replica 1 stops rotating, the drilling tool feeds along the axis direction of the main shaft (i.e., the axial direction), and the feeding speed is controlled at 0.1 - 0.2 mm / r. This feed amount can ensure that the surface roughness Ra of the hole wall ≤ 12.5 μm. The drilling depth is controlled by the Z-axis coordinate of the machine tool, and it is necessary to ensure that the hole depth reaches the design size, and the tolerance is controlled within ±0.1 mm. During the drilling process, a cutting fluid needs to be used for cooling and lubrication, and the concentration of the cutting fluid is controlled at 8% - 10% to reduce the cutting temperature and extend the life of the drill bit.

[0046] Step S6: After machining is completed, loosen the bolts 13 in the reverse order, remove the fixing clamp 5, and then remove the support plate 02 from the positioning part 4. Attention should be paid to avoiding bumps during disassembly to prevent damage to the machined positioning holes 03. In the quality inspection process, a vernier caliper is used to measure the diameter size of the positioning holes 03, a dial indicator is used to detect the perpendicularity of the axis of the hole to the end face of the support plate 02 (error ≤ 0.03 mm), and a circularity gauge is used to check whether the four positioning holes 03 are located on the same circumference, and the circularity error needs to be ≤ 0.05 mm. Only when all the detection indicators meet the design requirements can it be determined that the support plate 02 is qualified for machining.

[0047] This processing method constructs a positioning reference consistent with the actual assembly through the sphere replica 1, and uses the rotational movement of the main shaft of the machine tool to realize the circumferential distribution machining of the four positioning holes 03. The process parameters and operation key points of each step are all centered around ensuring the hole position accuracy. From fixture manufacturing, installation and calibration to part machining and quality inspection, a complete process control chain is formed, effectively solving the technical problem that it is difficult to ensure that the four positioning holes 03 are on the same circumference in traditional machining, realizing the high-precision machining of the support plate 02, and providing a reliable guarantee for the assembly quality of the ball valve.

[0048] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special fixture for processing the support plates of a sphere, with two support plates installed on two support surfaces of the sphere, characterized in that: It includes a spherical replica. Mounting surfaces are respectively provided on the left and right sides of the spherical replica. The distance between the two mounting surfaces is equal to the distance between the two support surfaces. A cylindrical positioning portion connected to the through hole at the center of the support plate is provided on the mounting surface, and a fixing clip for fixing the support plate is provided on the mounting surface; A butting portion is connected to the rear end of the spherical replica, and a fixing portion is connected to the rear end of the butting portion. A butting surface capable of butting against the support plate is provided on the butting portion. The butting surface is perpendicular to the mounting surface, and the distance from the butting surface to the central axis of the positioning portion is equal to the distance from the center of the support plate to its end face to be machined; The central axis of the fixing portion is vertically intersecting with the central axis of the positioning portion, and the central axis of the fixing portion is located in the middle position between the two mounting surfaces; in the front-rear direction, the length of the support plate is equal to or less than the length of the spherical replica.

2. The special fixture for processing the support plate of a sphere according to claim 1, characterized in that: A groove is provided on the mounting surface, and the positioning portion is detachably connected in the groove.

3. The special fixture for processing the support plate of a sphere according to claim 2, characterized in that: A threaded hole is provided at the bottom of the groove, and a through hole corresponding to the threaded hole is provided on the positioning portion; the fixing clip is strip-shaped, and a connection hole corresponding to the through hole is provided on the fixing clip, and a bolt is connected in the connection hole.

4. The special fixture for processing the support plate of a sphere according to claim 2, wherein: The positioning portion includes a connecting section and a positioning section arranged coaxially. The connecting section is adaptively connected to the groove, and the positioning section is connected to the support plate.

5. The special fixture for processing the support plate of a sphere according to claim 1, characterized in that: The spherical replica is of a rectangular body structure, both the butting portion and the fixing portion are of a cylindrical structure, and the diameter of the butting portion is larger than the diameter of the fixing portion.

6. A processing method for a support plate of a sphere, characterized in that, It includes the following steps: Step S1, manufacture the spherical replica according to any one of claims 1-5; Step S2, fixedly install the fixing portion of the spherical replica in the spindle chuck on the machine tool; Step S3, take the manufactured support plate. The support plate is of a rectangular body structure, and a through hole adapted to be connected to the positioning portion is provided at the center of the support plate; Step S4, install the support plate on the mounting surface and fix the support plate through the fixing clip. The rear end face of the support plate abuts against the butting surface; Step S5, use a drilling tool to perform drilling on the front end face of the support plate; the spindle of the machine tool drives the spherical replica to rotate, so that the four positions on the two support plates where holes need to be machined are sequentially rotated to the positions corresponding to the drilling tool; during machining, the spherical replica stops rotating, and the drilling tool feeds towards the support plate, and the feeding direction of the drilling tool is the spindle axis direction; Step S6, complete the machining and remove the support plate from the machine tool.

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