CN-116475704-B - Manufacturing method for improving rust resistance of composite material die

Abstract

The invention discloses a manufacturing method for improving the rust resistance of a composite material die, which comprises a die main body and a forming and positioning assembly, wherein the manufacturing process comprises the following steps of S1, selecting a steel material with the atmospheric corrosion resistance coefficient of not less than 5; and S2, welding the selected steel material to obtain a die, performing heat treatment aging and machining, polishing the working surface of the die main body, performing rust prevention on the non-working surface of the die main body, and performing rust prevention on the forming positioning assembly. The die has excellent antirust performance, does not have the risks of cracking and falling off of a paint surface, has longer service life, reduces the material cost by more than 70 percent, reduces the use and maintenance cost of the die, can ensure the long-term stability of the molded surface precision and the surface quality of a composite product, is favorable for mass production of the composite part die, and achieves the purposes of high quality and low cost.

Inventors

• ZHANG YONGBING
• SHI ZHANGHU
• RAO HUA
• ZHENG WEITAO
• MA ZHAOSHAN

Assignees

• 成都飞机工业（集团）有限责任公司

Dates

Publication Date

20260512

Application Date

20230407

Claims (6)

1. 1. A manufacturing method for improving the rust resistance of a composite material die is characterized in that the die comprises a die main body and a forming and positioning assembly, and the manufacturing process comprises the following steps of S1, selecting a steel material with the atmospheric corrosion resistance coefficient of not less than 5; s2, welding the steel material selected in the step S1 to obtain a die, and then performing heat treatment aging and machining to polish the working surface of the die main body; step S3, performing rust prevention treatment on the die main body according to the following steps that step S311, performing surface cleaning treatment on a non-working surface of the die main body, wherein the surface cleaning treatment comprises the steps of blowing sand to the non-working surface to remove rust, polishing surface welding slag and oxide which are not fallen off, and then removing oil and dust; Step S312, spraying a primer with temperature resistance on the non-working surface of the die main body, and curing under the conditions of heating to 80+/-10 ℃ and preserving heat for 50+/-20 minutes; step S313, spraying finishing paint with temperature resistance on the non-working surface of the die main body, and curing under the conditions that the temperature is raised to 80+/-10 ℃ and the temperature is kept for 50+/-20 minutes; and (3) performing rust prevention treatment on the formed positioning assembly according to the following steps: Step S321, carrying out surface cleaning treatment on the forming positioning assembly, wherein the surface cleaning treatment comprises pickling, degreasing, derusting and cleaning; step S322, chemically plating anti-corrosion alloy on the surface of the formed positioning component, and then heating the formed positioning component to 220 (+ -) The temperature is 20 ℃ and the temperature is kept for 120+/-20 minutes.
2. 2. The manufacturing method for improving the rust resistance of the composite material die according to claim 1 is characterized in that the concrete process of selecting the steel material comprises the following steps of S11, performing chemical component test on the standby steel material; s12, calculating an atmospheric corrosion resistance coefficient according to chemical components by a Larrabee-Coburn method; and S13, selecting a steel material with the atmospheric corrosion resistance coefficient of more than or equal to 5 as a die material.
3. 3. The method for improving the rust inhibitive performance of a composite material mold according to claim 2, wherein the atmospheric corrosion resistance coefficient is not less than 6.5 when selecting the steel material.
4. 4. The method of claim 1, wherein the mold body comprises a frame, a forming die plate, a portal frame, and the forming and positioning assembly comprises a reinforcing rib forming block, a small insert, a drill plate, and a vacuum joint.
5. 5. The method of claim 1, wherein the corrosion resistant alloy is a nickel-phosphorus alloy.
6. 6. The method for manufacturing a composite mold with improved rust inhibitive performance according to any of claims 1 and 2, wherein the steel material selected is Q235NH or Q295GNH.

Description

Manufacturing method for improving rust resistance of composite material die Technical Field The invention relates to the technical field of composite material die manufacturing, in particular to a manufacturing method for improving rust resistance of a composite material die. Background In the modern aircraft manufacturing process, a large amount of advanced composite materials are adopted, composite material parts are subjected to hot press forming in an autoclave under a die, and the profile precision, high-temperature high-pressure air tightness and surface quality (roughness and waviness) of a die surface used for forming have great influence on the precision and surface quality of a composite material product, so that the precision, air tightness and long-term stability of the surface quality of the composite material die are necessary conditions for ensuring the precision and surface quality stability of the composite material product. At present, the materials commonly used for die manufacturing are low-expansion alloy materials, carbon fiber composite materials, aluminum alloy materials and common steel materials. The low expansion alloy material (such as 4J 36) has small thermal expansion coefficient, high density, long service life and short manufacturing period, is not easy to rust in the atmosphere, but has the cost more than 30 times of that of common steel. The carbon fiber composite material has the advantages of small thermal expansion coefficient, small density, no atmospheric corrosion, long manufacturing period, cost which is more than 20 times of that of common steel, shorter service life, low expansion alloy material and carbon fiber composite material which are higher in cost, unsuitable for manufacturing a composite material die with lower cost requirement, low density of aluminum alloy material, difficult atmospheric corrosion, longer service life and short manufacturing period, but has the advantages of large thermal expansion coefficient, cost which is 3-5 times of that of common steel, and unsuitable for manufacturing a die of a large, complex and precise composite material product with the curing temperature exceeding 100 ℃. The common steel material has high density, low cost, short manufacturing period and long service life, but has larger thermal expansion coefficient and easy atmospheric corrosion, is suitable for the die of common composite material products with low precision requirement and cost control requirement, is commonly used as domestic common steel materials such as Q235A, 20 steel and the like, and foreign common steel materials such as AISI1015, ST37-2, ST52, ASTM A572 GR50 and the like, and has the advantages of lowest material cost, easiest purchase, best welding performance and forming and processing performance, so the common composite material products in the domestic and foreign aerospace fields are the most common materials for a long time, the rust prevention treatment of the common steel material die is spraying high-temperature resistant paint or performing conventional oxidation treatment, the rust prevention treatment can directly influence the geometric precision and the surface quality of composite material parts after the steel material die is used for a period of time, the product quality problem can be caused, and the product is scrapped and the loss is great. Therefore, the composite material mold rust prevention technology is researched, the rust prevention technology comprises the rust prevention performance of various part matrixes and the adaptive reinforcement rust prevention treatment on various parts, and the rust prevention technology is very necessary for improving the surface quality of composite material products, avoiding scrapping and reducing the cost. Disclosure of Invention The invention aims to solve the problems that the rust resistance of a common steel material composite material die part with low cost is poor, the surface quality of a composite material product is affected, and even the composite material product is scrapped in the prior art, and provides a manufacturing method for improving the rust resistance of the composite material die, so that the surface quality of the composite material product is improved, and the composite material product is prevented from being scrapped. In order to achieve the above object, the present invention provides the following technical solutions: The manufacturing method for improving the rust resistance of the composite material die comprises a die main body and a forming and positioning assembly, and the manufacturing process comprises the following steps of: s1, selecting a steel material with an atmospheric corrosion resistance coefficient of not less than 5; s2, welding the steel material selected in the step S1 to obtain a die, and then performing heat treatment aging and machining to polish the working surface of the die main body; step S3, performing rust prevention on the non