A method for machining a 5m diameter conical bottom surface with a deformation constraint

Abstract

The application provides a 5m diameter conical box bottom surface keeping deformation constraint machining method, which comprises the following steps: S1, preparing a conical blank box bottom; S2, product clamping; S3, turning an end face; S4, installing a deformation constraint device; S5, hole making; S6, turning an inner shape; S7, overturning; S8, turning an outer shape; S9, primary stress relief heat aging; S10, milling an outer shape grid; S11, secondary stress relief heat aging; and S12, cutting off a large end allowance; the application can effectively inhibit real-time deformation in the turning and milling process of the conical box bottom part.

Description

Technical Field

[0001] This invention belongs to the field of rocket box bottom processing, and in particular relates to a processing method for maintaining deformation constraint of a 5m diameter conical box bottom profile. Background Technology

[0002] The conical part has a 45-degree conical surface, with a large end diameter of approximately 4.6m, a small end diameter of 2.1m, and a height of approximately 1.2m. Both ends are open structures. The outer surface has several high-density orthogonal grids, with a grid thickness of 4mm at the bottom and 20mm at the top. This type of structure has two characteristics: 1. The ultra-high diameter-to-thickness ratio due to the large diameter and thin wall thickness. 2. The 45° unconstrained open structure results in a part exhibiting weak overall stiffness.

[0003] The existing processing technology is "turning for equal thickness reduction + milling for mesh opening". During single or multiple process flows, the product often experiences significant deformation, greatly hindering the final precision control. This is mainly manifested in: 1. Residual stress release. After integral forming, the internal stress of the product is in a stable state. During machining, material removal leads to sufficient stress distribution, while the release of residual stress further contributes to product deformation; 2. Uneven thinning. The integrally formed blank has certain deviations in roundness and straightness. During turning, the rotary motion of the tool inevitably leads to unevenness in the cutting process, often resulting in inconsistent thickness. This thickness inconsistency leads to differences in the product's internal strength characteristics, with thinner areas more prone to deformation; 3. Open structure. The product has a 45-degree open structure, which is more prone to deformation. Lifting and flipping within processes, and handling between processes, can easily cause irreversible deformation. In summary, deformation problems are a critical issue in the processing of such products.

[0004] For the problem of irregular deformation of a 5m diameter conical box-shaped bottom part, the existing deformation constraint method is mainly the mold support method. This method uses two sets of inner and outer molds to support and constrain the inner and outer surfaces. When supporting the inner surface, the outer surface is machined; conversely, when supporting the outer surface, the inner surface is machined. The main problems are as follows:

[0005] (1) Taking the support of the outer surface and the processing of the outer surface as an example. At this time, the product is in an open form with the small end facing down and the large end facing up. According to the structural analysis of this type of product and engineering practice, the product often tends to deform inward. At this time, the mold support can only suppress the outward deformation of the product and cannot restrain its inward deformation trend, resulting in the product being too deformed to be further processed;

[0006] (2) The product process requires turning and milling. The process involves flipping and turnover. During this process, the support method of the mold cannot be constrained throughout the entire process. During the process of removing the support, the deformation of the product is unrestrained and uncontrollable. However, the product is still in a semi-finished state at this time. Excessive deformation will make the product unable to be further processed.

[0007] In summary, there is currently no effective solution in China for maintaining the bottom profile and constraining the deformation of a 5m diameter conical box. Summary of the Invention

[0008] In view of this, the present invention aims to propose a machining method for maintaining the deformation constraint of the bottom surface of a 5m diameter conical box, which can effectively suppress the real-time deformation during the milling and turning process of conical parts.

[0009] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0010] A method for maintaining deformation constraints on the bottom profile of a 5m diameter conical box includes the following steps:

[0011] S1. Prepare a conical blank box bottom; the height allowance at the large end of the conical blank box bottom is greater than 100mm, extending along the 45° profile; the height allowance at the small end is greater than 50mm, extending along the 45° profile, and the small end plane is closed; prefabricate clamping holes and lifting holes at the small end.

[0012] S2. Product clamping; The product, i.e. the bottom of the blank box, with the large end facing up and the small end facing down; The product is rounded on the machine tool, and an adapter plate is set on the machine tool. The adapter plate has an adapter hole corresponding to the clamping hole; The screw passes through the clamping hole and the adapter hole, and cooperates with the nut to fix the product to the machine tool table through the adapter plate.

[0013] The product's mid-section is supported by a support device to achieve initial clamping.

[0014] S3, machining the end face; cutting the large end face of the product so that the pitch circle of the through hole of the deformation constraint device is located at the center of the large end face of the product;

[0015] S4. Install the deformation restraint device; first, arrange several top support devices around the product, and hoist the deformation restraint device to the large end face; use the top support devices to fine-tune the deformation restraint device and fix it in place.

[0016] S5. Drilling holes: Drill holes on the bottom end face of the conical box according to the position of the through holes on the deformation constraint device;

[0017] S6. Interior shape; Turn the interior shape of the product; Install a reference block on the outer circumference of the deformation constraint device; Use a cutting tool to turn the outer wall of the reference block until the entire outer wall of the reference block is exposed to light, ensuring that the four side walls are on the same reference circle, and realize the reference transfer.

[0018] S7. Flipping: A process window is made at the large end of the product. The product is flipped through the lifting process window and lifting hole. After flipping, the product is fixed by a ring support device.

[0019] S8, Vehicle outline; Through the ring support device, deformation constraint device and small end closed structure, it can complete the surface maintenance and deformation constraint of the large end, middle end and small end of the product; Align the horizontal level of the reference block and the center of the deformation constraint device, and perform shape cutting;

[0020] S9. Stress-relieving heat aging in one step: After turning, the conical box bottom semi-finished product, together with the deformation constraint device at the large end, is subjected to heat treatment aging under the premise of double constraint at both the large and small ends to release the processing stress and suppress heat treatment deformation.

[0021] S10. Mill the outer mesh; Mill the outer mesh according to the three-segment constraint clamping method in S8;

[0022] S11, Secondary stress-relieving thermal aging; After milling, the deformation constraint device at the large end is subjected to a second stress-relieving thermal aging to further release the milling stress.

[0023] S12. Remove excess material at both ends; mill the excess material connected to the deformation constraint device at the large end and close the small end flat. After removal, the finished part of the tapered box bottom is obtained.

[0024] Furthermore, in step S4, the adjustment principles include the following points:

[0025] a. The center of the through hole of the deformation constraint device at the large end falls on the engraving line on the end face of the product;

[0026] b. The gap between the deformation constraint device at the large end and the end face of the product is less than 0.1mm;

[0027] c. The height of the jack should be 0.05-0.1mm higher than the large end face.

[0028] Furthermore, the deformation constraint device is generally circular; the surface of the deformation constraint device is provided with a groove, so that the cross-section of the deformation constraint device is concave; the groove is provided with two sets of grading circles, and each set of grading circles is provided with 120 through holes.

[0029] Furthermore, the through holes of the two sets of indexing circles are staggered.

[0030] Furthermore, four reference blocks are evenly arranged on the outer circumference of the deformation constraint device, and the reference blocks are connected by a screw deformation constraint device.

[0031] Furthermore, the support device includes a support box and a support block. The support block is installed on the support box, and the surface of the support block that contacts the product matches the taper of the product. The number of support devices is 8, which are evenly distributed.

[0032] Furthermore, the top support device includes a first jack and a pressure plate; the first jack is installed on the top support box and is used to press down on the lower end face of the deformation constraint device; the pressure plate is installed on the machine tool by studs and is used to press down on the upper end face of the deformation constraint device; the top support box is also provided with a support column, which is used to support the pressure plate.

[0033] Compared with existing technologies, the processing method for maintaining deformation constraints on the bottom profile of a 5m diameter conical box described in this invention has the following advantages:

[0034] This invention discloses a deformation constraint method for machining a 5m diameter conical box bottom profile. Addressing the machining deformation issues caused by the open structure, residual stress release, and uneven thinning of the 5m diameter conical box bottom during machining, a full-process deformation constraint device for turning and milling is designed based on the end-face constraint mechanism. Based on this device, a deformation constraint method for turning and milling large-diameter conical parts is proposed, including: full-process constraint by the deformation constraint device, an overall profile maintenance process, and a three-stage constraint clamping method. This entire invention effectively suppresses deformation during the overall turning and milling of a 5m diameter conical box bottom, achieving good profile maintenance. This method is applicable to large-diameter conical parts. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0036] Figure 1 This is a schematic diagram of the product clamping with the small end face at the bottom as described in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the product clamping with the large end face at the bottom as described in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the deformation constraint device described in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a second embodiment of the deformation constraint device described in this invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Product; 2. Support device; 3. Deformation constraint device; 31. Groove; 4. Annular support device; 5. Top support device; 51. No. 1 jack; 52. Stud; 53. Pressure plate; 54. Support column; 6. Reference block. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] A method for maintaining deformation constraints on the bottom profile of a 5m diameter conical box includes the following steps:

[0047] S1. Prepare a conical blank box bottom; the height allowance at the large end of the conical blank box bottom is greater than 100mm, extending along the 45° profile; the height allowance at the small end is greater than 50mm, extending along the 45° profile, and the small end plane is closed; prefabricate clamping holes and lifting holes at the small end; the clamping holes are 6-Φ55 holes, and the lifting holes are Φ85 holes;

[0048] S2. Product 1 clamping; Product 1, which is the bottom of the blank box; large end facing up, small end facing down; roundness alignment of Product 1 on the machine tool; an adapter plate is set on the machine tool, and the adapter plate has an adapter hole corresponding to the clamping hole; the screw passes through the clamping hole and the adapter hole, and cooperates with the nut to fix Product 1 to the machine tool table through the adapter plate.

[0049] The supporting device 2 supports the outer surface of the middle part of product 1, achieving initial clamping, such as... Figure 1 As shown;

[0050] S3, machining the end face; cutting the large end face of product 1 so that the pitch circle of the through hole of the deformation constraint device 3 is located at the center of the large end face of product 1.

[0051] S4. Install the deformation restraint device 3; first, arrange several support devices 5 around product 1, and hoist the deformation restraint device to the large end face; use the support devices 5 to fine-tune and fix the deformation restraint device 3, such as... Figure 1 As shown;

[0052] First, set up several top support devices 5 on the outside of product 1, evenly distributed in 12 places; adjust the height of the No. 1 jack 51 to be 0.2mm higher than the large end face, so that the self-weight of the deformation restraint device 3 at the large end can act more on the jack, reducing the deformation effect of the self-weight of the deformation restraint device 3 on product 1; hoist the large end restraint device to the large end face, and use the 12 No. 1 jacks 51 to make minor adjustments to it;

[0053] Adjustment principle: 1. The center of the through hole of the deformation constraint device 3 at the large end falls on the engraving line on the end face of product 1;

[0054] 2. The gap between the deformation constraint device 3 at the large end and the end face of product 1 is less than 0.1mm;

[0055] 3. The height of the No. 1 jack 51 is 0.05-0.1mm higher than the end face of the large end. After the adjustment is completed according to the above principle, the connecting hole on the deformation constraint device 3 of the large end can be in a reasonable position on the end face, while taking into account the influence of the self-weight of the deformation device of the large end and the subsequent assembly connection. After the adjustment is completed, the deformation constraint device 3 of the large end is fixed by pressing and pushing with the pressure plate 53.

[0056] S5. Drill holes; Drill holes on the bottom end face of the conical box according to the position of the through hole on the deformation constraint device 3.

[0057] The hole-making process is as follows:

[0058] 1. Since the height of the deformation constraint device 3 is 100mm, the drill bit needs to pass through this height to drill a hole in the end face. It is difficult to control the drilling direction by manual drilling. Therefore, a custom-made M12 bottom hole drill bushing is used. The small end of the drill bushing is inserted into the hole of the deformation constraint device 3. The drill bit and the drill jig are used to guide the threaded bottom hole. During the process, aluminum chips are continuously blown away to complete the bottom hole drilling.

[0059] 2. Use the customized M12 tapping extension rod shown in the right figure to apply force to the tap to complete the tapping. To meet the connection requirements, the tapping depth must be greater than 10 thread pitches.

[0060] After the threaded hole is made, the deformation constraint device 3 is connected to the bottom end face of the conical box by M12 screws to achieve constraint and fixation. After the fixation is completed, the fitting gap between the end face of the deformation constraint device 3 and the product 1 is checked by feeler gauge. If the gap is less than 0.1mm, it is considered that the connection is tight.

[0061] S6, Inner shape; Turn the inner shape of product 1; Install reference block 6 on the outer circumference of deformation constraint device 3; Use a cutting tool to turn the outer wall of reference block 6 until the outer wall of reference block 6 is completely exposed to light, ensuring that the four side walls are on the same reference circle, and realize the reference transfer.

[0062] Considering the four-point circle finding method commonly used in machine tools, the number of reference blocks 6 is 4; at the same time, after the inner shape is turned, the lower end face of the conforming steel ring is measured. If the lower end face is larger than 0.2mm, the lower end face of the conforming steel ring is turned to a smooth finish so that its end face is consistent with the horizontal reference of the table surface for subsequent alignment.

[0063] S7. Flipping: A process window is made at the large end of product 1. Product 1 is flipped through the lifting process window and lifting hole. After flipping, product 1 is fixed by the ring support device 42.

[0064] Because the large-end deformation device is connected to the end face of product 1 by a thread, if the interface on the large-end deformation constraint device 3 is used for lifting during the flipping and hoisting process, the point of force is the deformation constraint device 3. The product 1 is lifted by the tension of the screw, which poses a risk of deformation constraint failure or unstable connection. Therefore, the flipping of product 1 is achieved by creating process windows in the remaining area of ​​the large end of product 1, with two evenly distributed locations. During the flipping, the large-end process window and the Φ85mm hoisting hole at the center of the small end are used to complete the flipping of product 1 along with the large-end deformation constraint device 3 through the operation of double slings and the large and small hooks of the crane.

[0065] S8, vehicle shape; through the ring support device 42, deformation constraint device 3, and small end closed structure, the shape of the large, middle, and small ends of product 1 can be maintained and deformation constrained; by using the machine tool jack alignment reference block 6 set on the machine tool and the center of the deformation constraint device 3, the shape cutting is performed, such as... Figure 2 As shown;

[0066] Small end: The small end is formed as a closed structure and is retained throughout the manufacturing process. It has good inherent stability and can provide a certain degree of constraint.

[0067] Mid-section: Place the integral support ring on the square box and fix it together with the square box on the lathe table; the support ring has a square cross-section structure with good overall rigidity; after product 1 is installed into the support ring, its circumferential direction is completely constrained and cannot move. Therefore, in order to ensure the consistency between the datum of product 1's center and the lathe's rotation center, the contact position between the support ring and product 1 needs to be machined to ensure that the datum height is consistent; at the same time, there are two choices for the machined contact surface: a slope and a circular arc surface. If the slope is machined, product 1 will be completely constrained after installation and the flatness cannot be adjusted; therefore, considering the datum adjustment problem after product 1 is installed, a circular arc surface is used as the contact surface; to ensure good contact between the support ring and product 1, the curvature of the arc at the contact position should be as gentle as possible, and according to experience, R20-R25 is generally selected;

[0068] Large end: Deformation constraint device 3 provides strong constraint to the large end and accompanies it throughout the entire process;

[0069] The alignment of product 1 is divided into finding the circle and leveling:

[0070] Since the support ring is pre-installed and fixed and the contact surface is machined, the center reference of product 1 automatically coincides with the rotation center after the product is assembled. In order to verify the degree of coincidence between the center and the rotation center, the outer surfaces of the four reference blocks 6 are measured using the deformation constraint device 3 at the large end. The roundness of the side is measured on the lathe using a dial indicator in conjunction with the rotational motion. When the dial indicator runout is within 0.2mm, it is determined that product 1 has been accurately rounded.

[0071] Leveling is based on the bottom end face of the deformation constraint device 3 at the large end. The bottom end face is measured using a dial indicator on a machine tool. At the same time, eight jacks are evenly distributed on the conforming steel ring. Fine adjustments are made using the jacks and the end face until the flatness of the bottom end face is 0.1mm, which can meet the processing accuracy requirements of product 1.

[0072] After product 1 is leveled, pressure plate 53 is used to press the jack support position, so that the pressure is evenly distributed at 8 points, and the clamping and fixing of product 1 can be completed.

[0073] S9. Stress-relieving heat aging in one step; After turning, the conical box bottom semi-finished product, together with the deformation constraint device 3 at the large end, undergoes heat treatment aging under the premise of double constraint at both the large and small ends to release the processing stress and suppress heat treatment deformation.

[0074] In order to fully consider the expansion coefficients of the deformation constraint device 3 and product 1 at the large end, and to reduce the deformation suppression aging caused by different expansion degrees during the thermal aging process, the thermal aging conditions are determined based on experience to be heating to 140°C and holding for 4 hours.

[0075] S10. Mill the outer mesh; Mill the outer mesh according to the three-segment constraint clamping method in S8;

[0076] S11, Secondary stress-relieving thermal aging; After milling, together with the deformation constraint device 3 at the large end, a second stress-relieving thermal aging is performed to further release the milling stress.

[0077] S12. Remove excess material at both ends; mill the excess material connected to the small end closed flat and the large end deformation constraint device 3, and the finished part of the tapered box bottom is obtained after removal.

[0078] Preferred, such as Figure 3 As shown, the deformation constraint device 3 is generally circular; the surface of the deformation constraint device is provided with a groove 31, so that the cross section of the deformation constraint device 3 is concave; the groove 31 is provided with two sets of grading circles, and each set of grading circles is provided with 120 through holes.

[0079] Preferably, the through holes of the two sets of sized circles are staggered.

[0080] As another embodiment of the deformation constraint device 3, such as Figure 4 As shown, the deformation constraint device does not have a groove 31. Instead, holes are made directly on the device, ensuring that the number of holes is 120 evenly distributed.

[0081] Preferably, four reference blocks 6 are evenly arranged on the outer circumference of the deformation constraint device, and the reference blocks 6 are connected by screw deformation constraint device 3.

[0082] Preferably, the support device 2 includes a support box and a support block, the support block is installed on the support box, and the surface of the support block that contacts the product 1 matches the taper of the product 1; and the number of support devices 2 is 8, which are evenly arranged.

[0083] Preferably, the top support device 5 includes a first jack 51 and a pressure plate 53; the first jack 51 is installed on the top support box and is used to press down on the lower end face of the deformation constraint device; the pressure plate 53 is installed on the machine tool by studs and is used to press down on the upper end face of the deformation constraint device 3; the top support box is also provided with a support column 54, which is used to support the pressure plate 53.

[0084] The pressure plate 53 has an elongated hole, and the top of the support column 54 has a mating section. The diameter of the mating section is smaller than the overall diameter of the support column 54. The mating section passes through the elongated hole, and is locked with bolts to limit the position of the pressure plate 53. Figure 1 As shown.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for maintaining deformation constraint on the bottom profile of a 5m diameter conical box, characterized in that: Includes the following steps: S1. Prepare a conical blank box bottom; the height allowance at the large end of the conical blank box bottom is greater than 100mm, extending along the 45° profile; the height allowance at the small end is greater than 50mm, extending along the 45° profile, and the small end plane is closed; prefabricate clamping holes and lifting holes at the small end. S2. Product clamping; The product, i.e. the bottom of the blank box, with the large end facing up and the small end facing down; The product is rounded on the machine tool, and an adapter plate is set on the machine tool. The adapter plate has an adapter hole corresponding to the clamping hole; The screw passes through the clamping hole and the adapter hole, and cooperates with the nut to fix the product to the machine tool table through the adapter plate. The product's mid-section is supported by a support device to achieve initial clamping. S3, machining the end face; cutting the large end face of the product so that the pitch circle of the through hole of the deformation constraint device is located at the center of the large end face of the product; S4. Install the deformation restraint device; first, arrange several top support devices around the product, and hoist the deformation restraint device to the large end face; use the top support devices to fine-tune the deformation restraint device and fix it in place. S5. Drill holes; Drill holes on the bottom end face of the conical box according to the position of the through holes on the deformation constraint device; After the threaded holes are drilled, use M12 screws to connect the deformation constraint device to the bottom end face of the conical box to achieve constraint and fixation. S6. Interior shape; Turn the interior shape of the product; Install a reference block on the outer circumference of the deformation constraint device; Use a cutting tool to turn the outer wall of the reference block until the entire outer wall of the reference block is exposed to light, ensuring that the four side walls are on the same reference circle, and realize the reference transfer. S7. Flipping: A process window is made at the large end of the product. The product is flipped through the lifting process window and lifting hole. After flipping, the product is fixed by a ring support device. S8, Vehicle outline; Through the ring support device, deformation constraint device and small end closed structure, it can complete the surface maintenance and deformation constraint of the large end, middle end and small end of the product; Align the horizontal level of the reference block and the center of the deformation constraint device, and perform shape cutting; S9, One-time stress-relief thermal aging; After turning, the conical box bottom semi-finished product, together with the deformation constraint device at the large end, is subjected to heat treatment aging under the premise of double constraint at both the large and small ends to release the processing stress and suppress heat treatment deformation. S10. Mill the outer mesh; Mill the outer mesh according to the three-segment constraint clamping method in S8; S11, Secondary stress-relief thermal aging; After milling, the deformation constraint device at the large end is subjected to a second stress-relieving thermal aging to further release the milling stress. S12. Remove excess material at both ends; mill the excess material connected to the deformation constraint device at the large end and close the small end flat. After removal, the finished part of the tapered box bottom is obtained.

2. The method for maintaining deformation constraint on the bottom profile of a 5m diameter conical box according to claim 1, characterized in that: In step S4, the adjustment principles include the following points: a. The center of the through hole of the deformation constraint device at the large end falls on the engraving line on the end face of the product; b. The gap between the deformation constraint device at the large end and the end face of the product is less than 0.1mm; c. The height of the jack should be 0.05-0.1mm higher than the large end face.

3. The method for maintaining deformation constraint on the bottom profile of a 5m diameter conical box according to claim 1, characterized in that: The deformation constraint device is generally circular; the surface of the deformation constraint device is provided with a groove, so that the cross-section of the deformation constraint device is concave; there are two sets of grading circles in the groove, and each set of grading circles is provided with 120 through holes.

4. The method for maintaining deformation constraint on the bottom profile of a 5m diameter conical box according to claim 3, characterized in that: The through holes of the two sets of sized circles are staggered.

5. The method for maintaining deformation constraint on the bottom profile of a 5m diameter conical box according to claim 1, characterized in that: Four reference blocks are evenly arranged on the outer circumference of the deformation constraint device, and the reference blocks are connected to the deformation constraint device by screws.

6. The method for maintaining deformation constraint of the bottom profile of a 5m diameter conical box according to claim 1, characterized in that: The support device includes a support box and a support block. The support block is installed on the support box, and the surface of the support block that contacts the product matches the taper of the product. The number of support devices is 8, which are evenly distributed.

7. The method for maintaining deformation constraint of the bottom profile of a 5m diameter conical box according to claim 1, characterized in that: The top support device includes a No. 1 jack and a pressure plate; the No. 1 jack is installed on the top support box and is used to press down on the lower end face of the deformation constraint device; the pressure plate is installed on the machine tool by studs and is used to press down on the upper end face of the deformation constraint device; the top support box is also provided with a support column, which is used to support the pressure plate.

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