A repairable disassembly method of a large composite cylindrical mold

Abstract

The application discloses a repairable dismounting method for a large composite material cylindrical mold. The application is a repairable dismounting method for a large cylindrical mold, which selectively and controllably corrodes the mold by an acid corrosion or an electrochemical corrosion method, has the remarkable advantages of small damage range of the mold, later repairability, no damage to the composite material product, realization of product demolding, avoidance of the loss of complete scrapping of the mold during dismounting, and the like. The application can realize the smallest damage to the mold during dismounting, is convenient for mold repair and reuse, is helpful for reducing the loss and cost, and has the demonstration significance for solving the demolding problem of the large composite material product.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, and in particular to a repairable disassembly method for a large composite material cylindrical mold. Background Technology

[0002] Molds are key tools in composite material molding, determining the shape and dimensions of composite products and the complexity of manufacturing processes. The rationality of mold design also determines molding efficiency and product quality. Furthermore, the initial purchase cost of molds accounts for a significant proportion of the total product cost, and this proportion increases with product size. Moreover, as mold size increases, various uncontrollable factors have a greater impact. Problems such as insufficient mold surface roughness, mold deformation, insufficient mold processing precision, inadequate demolding coating, and inconsistent coefficients of thermal expansion often lead to product failure to demold. In such cases, the common approach is to dismantle the product to preserve the mold, especially for large composite products. Although mold costs are high, the cost of the composite product itself is sometimes even higher, and irreparable damage to either results in substantial losses.

[0003] To address the above problems, this invention proposes a repairable dismantling method for large cylindrical molds, which can minimize damage to the mold during dismantling, facilitate mold repair and reuse, and help reduce losses and lower costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a repairable disassembly method for large composite cylindrical molds that can minimize damage to the mold during disassembly, facilitate mold repair and reuse, and help reduce losses and costs.

[0005] The technical problem to be solved by this invention is achieved through the following technical solution. This invention is a repairable disassembly method for a large composite material cylindrical mold, comprising the following steps:

[0006] (1) Remove the mold handle. Remove the mold handle at the small end of the cylindrical mold to leave a passage for personnel to enter the cylindrical mold for operation. At the same time, retain the mold handle at the large end of the cylindrical mold for continued demolding.

[0007] (2) A longitudinal groove is cut along the inner wall of the working surface of the cylindrical mold. A certain thickness is maintained between the working surface of the cylindrical mold and the product surface to avoid damaging the composite material product.

[0008] (3) Protect the groove by applying glue or spraying glue to the area outside the bottom of the groove, leaving only the bottom area of ​​the groove exposed as a controllable area for corrosion of the cylindrical mold.

[0009] (4) Use wet corrosion to corrode the remaining wall thickness of the working surface of the cylindrical mold, so that the groove cut by the cylindrical mold is completely broken;

[0010] (5) Demolding the cylindrical mold under the action of the demolding machine;

[0011] (6) After demolding, the cylindrical mold is internally supported, shaped, and fixed by electric welding, and the seam is cut and welded. The small end mold handle is then installed. The working surface of the cylindrical mold is then processed by a machine tool, which completes the repairable demolition of the cylindrical mold.

[0012] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: for the repairable disassembly method of the large composite cylindrical mold described above, the wall thickness between the working surface of the cylindrical mold and the product surface is not less than 5mm.

[0013] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: for the repairable disassembly method of the large composite cylindrical mold described above, the wall thickness L3 between the bottom of the groove and the product surface of the cylindrical mold is 0.5-3mm.

[0014] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the repairable disassembly method of the large composite cylindrical mold described above, the groove is flared in shape, the bottom width L2 of the groove is less than the outer opening width L1 of the groove, L1≥10mm, and L1:L2=2~5:1.

[0015] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: for the repairable disassembly method of the large composite cylindrical mold described above, the groove is continuous along the length direction of the mold, and the length of the groove accounts for 3 / 5 to 4 / 5 of the total length of the cylindrical mold.

[0016] The technical problem to be solved by the present invention can also be further realized by the following technical solution: For the repairable disassembly method of the large composite cylindrical mold described above, in step (3), the adhesive used to protect the groove is a polymer resin adhesive with a certain acid and alkali corrosion resistance.

[0017] The technical problem to be solved by the present invention can also be further realized by the following technical solutions. For the repairable disassembly method of the large composite cylindrical mold described above, in step (4), the wet corrosion method is the acid corrosion method, specifically the use of flowing hydrochloric acid for corrosion, with a hydrochloric acid concentration of 5 to 37%.

[0018] The technical problem to be solved by the present invention can also be further realized by the following technical solutions. For the repairable disassembly method of the large composite cylindrical mold described above, in step (4), the wet corrosion method is an electrochemical corrosion method. Specifically, the cylindrical mold is used as the anode, the copper plate is used as the cathode, and the flowing sodium chloride solution is used as the electrolyte. The cylindrical mold is selectively corroded by a low voltage and high current DC electrochemical method.

[0019] Compared with existing technologies, this invention provides a repairable demolition method for large cylindrical molds. By selectively and controllably corroding the mold using wet corrosion, it has significant advantages such as small mold damage area and subsequent repairability. At the same time, it does not damage the composite material product. While achieving product demolding, it avoids the loss of complete mold scrap during demolding. It has exemplary significance for solving the demolding problem of large composite material products. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a disassembly state according to the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figure 1 A repairable disassembly method for a large composite cylindrical mold includes the following steps:

[0023] (1) Remove the mold handle. Remove the mold handle at the small end of the cylindrical mold 2 to leave a passage for personnel to enter the cylindrical mold 2 for operation, so that the operator can more easily carry out the disassembly operation of the cylindrical mold 2. At the same time, retain the mold handle at the large end of the cylindrical mold 2 for subsequent demolding operation.

[0024] (2) A longitudinal groove 1 is cut along the inner wall of the working surface of the cylindrical mold 2. The groove 1 is continuous along the length of the mold, and the length of the groove 1 accounts for 3 / 5 to 4 / 5 of the total length of the cylindrical mold 2. The groove 1 is funnel-shaped, and the bottom width L2 of the groove 1 is less than the outer opening width L1 of the groove 1. L1 ≥ 10 mm, L1:L2 = 2 to 5:1.

[0025] Meanwhile, the wall thickness L3 between the bottom of groove 1 and the product surface of cylindrical mold 2 is 0.5-3mm;

[0026] Secondly, the wall thickness between the working surface of the cylindrical mold 2 and the product surface is kept to meet the requirements of the secondary processing allowance after repair, and to avoid damage to the composite material product 4. Preferably, the wall thickness between the working surface of the cylindrical mold 2 and the product surface is not less than 5mm.

[0027] (3) Protect the groove 1 by applying glue or spraying glue to the area outside the bottom of the groove 1, leaving only the bottom area of ​​the groove 1 exposed as a controllable area for corrosion of the cylindrical mold 2.

[0028] Preferably, the adhesive used to protect the trench 1 is a polymer resin adhesive, which has a certain resistance to acid and alkali corrosion.

[0029] (4) The remaining working wall thickness of the cylindrical mold 2 is corroded by wet corrosion method. That is, the corrosive medium 3 for wet corrosion is placed in the groove 1 to corrode the cylindrical mold 2 at the bottom of the groove 1, so that the cylindrical mold 2 is broken from the groove 1, which facilitates the subsequent demolding operation, and at the same time, there is no obvious damage to the composite material product 4.

[0030] Specifically, the wet etching method is selected from any of the following methods:

[0031] The first wet corrosion method is acid corrosion, which specifically uses flowing hydrochloric acid with a concentration of 5-37%.

[0032] The second wet corrosion method is the electrochemical corrosion method, which specifically uses the cylindrical mold 2 as the anode, the copper plate as the cathode, and the flowing sodium chloride solution as the electrolyte. The cylindrical mold 2 is selectively corroded by a low-voltage, high-current DC electrochemical method.

[0033] (5) Demolding the cylindrical mold 2 under the action of the demolding machine;

[0034] (6) After demolding, the cylindrical mold 2 is internally supported, shaped, fixed by electric welding, cut and welded, and the small end mold handle is installed. Then, the working surface of the cylindrical mold 2 is processed by machine tool, so that the repairable demolition of the cylindrical mold 2 can be completed.

[0035] The repairable disassembly method for large composite cylindrical molds provided by this invention can effectively disassemble large composite cylindrical molds without damaging the composite product, and can minimize damage to the mold. The mold can be repaired and reused later, which helps to reduce losses and lower costs. This method has exemplary significance in solving the demolding problem of large composite products.

Claims

1. A repairable disassembly method for a large composite material cylindrical mold, characterized in that: Includes the following steps: (1) Remove the mold handle. Remove the mold handle at the small end of the cylindrical mold to leave a passage for personnel to enter the cylindrical mold for operation. At the same time, retain the mold handle at the large end of the cylindrical mold for continued demolding. (2) A longitudinal groove is cut along the inner wall of the working surface of the cylindrical mold. A certain thickness is maintained between the working surface of the cylindrical mold and the product surface to avoid damaging the composite material product. (3) Protect the groove by applying glue or spraying glue to the area outside the bottom of the groove, leaving only the bottom area of ​​the groove exposed as a controllable area for corrosion of the cylindrical mold. (4) Use wet corrosion to corrode the remaining wall thickness of the working surface of the cylindrical mold, so that the groove cut by the cylindrical mold is completely broken; (5) Demolding the cylindrical mold under the action of the demolding machine; (6) After demolding, the cylindrical mold is internally supported, shaped, and fixed by electric welding, and the seam is cut and welded. The small end mold handle is then installed. The working surface of the cylindrical mold is then processed by a machine tool, which completes the repairable demolition of the cylindrical mold.

2. The repairable disassembly method for a large composite cylindrical mold according to claim 1, characterized in that: The wall thickness between the working surface and the product surface of the cylindrical mold shall not be less than 5mm.

3. The repairable disassembly method for a large composite cylindrical mold according to claim 1 or 2, characterized in that: The wall thickness L3 between the bottom of the groove and the product surface of the cylindrical mold is 0.5-3mm.

4. The repairable disassembly method for a large composite cylindrical mold according to claim 3, characterized in that: The groove is funnel-shaped, with the bottom width L2 being smaller than the outer opening width L1, where L1 ≥ 10 mm and L1:L2 = 2 to 5:

1.

5. The repairable disassembly method for a large composite cylindrical mold according to claim 4, characterized in that: The groove is continuous along the length of the mold, and the length of the groove accounts for 3 / 5 to 4 / 5 of the total length of the cylindrical mold.

6. The repairable disassembly method for a large composite material cylindrical mold according to claim 1, characterized in that: In step (3), the adhesive used to protect the trench is a polymer resin adhesive with a certain resistance to acid and alkali corrosion.

7. The repairable disassembly method for a large composite cylindrical mold according to claim 1, characterized in that: In step (4), the wet corrosion method is the acid corrosion method, specifically the use of flowing hydrochloric acid for corrosion, with a hydrochloric acid concentration of 5-37%.

8. The repairable disassembly method for a large composite cylindrical mold according to claim 1, characterized in that: In step (4), the wet corrosion method is an electrochemical corrosion method. Specifically, the cylindrical mold is used as the anode, the copper plate is used as the cathode, and the flowing sodium chloride solution is used as the electrolyte. The cylindrical mold is selectively corroded by a low-voltage, high-current DC electrochemical method.

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