Often determine the wear resistance of the mold material. The mold is subject to considerable compressive stress and friction during work, which requires the mold to maintain its dimensional accuracy under strong friction. Mold wear is mainly of three types: mechanical wear, oxidative wear and melt wear. In order to improve the wear resistance of the mold steel, it is necessary to maintain the mold steel's high hardness and ensure that the composition, morphology and distribution of carbides or other hardened phases in the steel are reasonable. For molds that are in service under heavy load and high-speed wear conditions, it is required that a thin and dense oxide film can be formed on the surface of the mold steel to maintain lubrication and reduce melt wear such as seizure and welding between the mold and the workpiece. It can reduce the oxidation wear caused by the oxidation of the mold surface. Therefore, the working conditions of the mold have a greater impact on the wear of the steel.
The abrasion resistance can be simulated test method to measure the relative abrasion resistance index as a parameter to characterize the abrasion resistance level under different chemical composition and microstructure state. The life before the specified burr height reflects the wear resistance of various steel types; the test is based on Cr12MoV steel for comparison.
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The performance requirements of plastic bottle cap mold steel
2019-12-20
Selection of steel for making plastic bottle cap molds
commonly used mold steels: 45 #, 40Cr, P20, 2738, 2316, 718, NAK80, S136, etc. General fitness equipment shell mold is best to choose P20 and 718 two reasonable prices, can also make the product surface to a certain degree of smoothness, especially the internal requirements of the gear is 2316 and 2738, if you want to ensure the quality of the mold can choose NAK80.
CNC milling, high-speed milling, CNC engraving, double-head EDM, high-speed precision carving and other equipment.
Equipment introduction: has a full set of processing equipment, including 6 CNC milling (one high-speed milling, accuracy can reach 0.1mm), 3 double-head EDM can reach 0.1mm, 3 high-speed precision carving (one of the slope (Carving), 3 large drilling machines, 5 wire cutting, 2 surface grinders can reach 0.02mm, and a milling machine.
The structure of the fitness equipment mold: the mold adopts the I-shaped structure, the cavity and the core use P20 or 718, the slider, the guide chute, and the insert are heat treated by 2316 or H13, the guide post, guide sleeve, gate sleeve, pull rod The reset lever uses SKD61 standard parts, and the mold base adopts the self-made standard mold base. Good material's corrosion resistance, toughness, thermal conductivity and hardness make polishing easier, which saves production cycles and costs, extends mold life, reduces maintenance and repair time, reduces the risk of cracking, and improves Increased productivity.
Design of the mold cooling system: The design of the cooling system is a relatively complicated task, that is, the cooling effect and the uniformity of the cooling must be considered, and the influence of the cooling system on the overall structure of the mold must be considered. The specific location and size of the cooling system must be determined; Key parts such as cooling of moving molds or inserts; cooling of side sliders and cores; design of cooling elements and selection of cooling standard elements. Our company began to analyze these series of problems when the mold was designed. The mold uses circulating water to flow in each part of the mold to reduce the cooling time during injection, improve the production efficiency of the product, and greatly reduce the production cost.
During mold design and processing: General fitness equipment and other assembly aspects: The main body and bottom cover are best assembled in the form of double snaps, that is, the double bottom of the product, and the upper shell is inserted straight down, so it is not easy to be misplaced, and the product assembly gap Uniform, the process seam is better than 0.5MM, general plastic products are most afraid of shrinkage, screw pillars and tendons under the product are most prone to shrinkage, the best way is to reduce the wall thickness around the screw column by 0.8-1 MM, in fact, is the top white. If the top white, the general lighting and demolding slope, PP material products should be at least 0.5 degrees above the demographic slope, ABS material products should be at least 1.5 degrees above the demolding slope, The ejector pin is best designed around the product (where the force is better)
CNC milling, high-speed milling, CNC engraving, double-head EDM, high-speed precision carving and other equipment.
Equipment introduction: has a full set of processing equipment, including 6 CNC milling (one high-speed milling, accuracy can reach 0.1mm), 3 double-head EDM can reach 0.1mm, 3 high-speed precision carving (one of the slope (Carving), 3 large drilling machines, 5 wire cutting, 2 surface grinders can reach 0.02mm, and a milling machine.
The structure of the fitness equipment mold: the mold adopts the I-shaped structure, the cavity and the core use P20 or 718, the slider, the guide chute, and the insert are heat treated by 2316 or H13, the guide post, guide sleeve, gate sleeve, pull rod The reset lever uses SKD61 standard parts, and the mold base adopts the self-made standard mold base. Good material's corrosion resistance, toughness, thermal conductivity and hardness make polishing easier, which saves production cycles and costs, extends mold life, reduces maintenance and repair time, reduces the risk of cracking, and improves Increased productivity.
Design of the mold cooling system: The design of the cooling system is a relatively complicated task, that is, the cooling effect and the uniformity of the cooling must be considered, and the influence of the cooling system on the overall structure of the mold must be considered. The specific location and size of the cooling system must be determined; Key parts such as cooling of moving molds or inserts; cooling of side sliders and cores; design of cooling elements and selection of cooling standard elements. Our company began to analyze these series of problems when the mold was designed. The mold uses circulating water to flow in each part of the mold to reduce the cooling time during injection, improve the production efficiency of the product, and greatly reduce the production cost.
During mold design and processing: General fitness equipment and other assembly aspects: The main body and bottom cover are best assembled in the form of double snaps, that is, the double bottom of the product, and the upper shell is inserted straight down, so it is not easy to be misplaced, and the product assembly gap Uniform, the process seam is better than 0.5MM, general plastic products are most afraid of shrinkage, screw pillars and tendons under the product are most prone to shrinkage, the best way is to reduce the wall thickness around the screw column by 0.8-1 MM, in fact, is the top white. If the top white, the general lighting and demolding slope, PP material products should be at least 0.5 degrees above the demographic slope, ABS material products should be at least 1.5 degrees above the demolding slope, The ejector pin is best designed around the product (where the force is better)
The development of foreign mold steel for bottle cap molds.
With the continuous development of mold steel manufacturing industry, the requirements for mold steel from metallurgical quality, quantity, and performance are constantly increasing. High-alloy, high-quality, optimized, low-grade material reinforcement and Expansion of materials and other trends, mold steel material development from low to advanced, the development trend is carbon tool steel → low alloy tool steel → high alloy tool steel, a series of new mold materials, mold standard steel number alloying degree Increasingly, for example, in the United States, all 15 kinds of hot work die steel alloy elements are all greater than 5%, while 10 alloy elements are greater than 10%, and the amount accounts for 80%.
New types of hot work die steels successively developed abroad include: (1) high hardenability extra large forging die steels, such as 40NiCrMoV7 in the international standard ISO, 40NCD16 in the French NF standard, etc .; (2) high heat resistance die steels, such as American H10A, Japan's Hitachi Metals YHD3, and special steel company's 5Mn15Ni5Cr8Mo2V2 steel, etc .; (3) high temperature hot work die steels, such as the United States T2M, T2C, Japan's Nimowal and so on.
In order to meet the special requirements of cold work molds, new cold work mold steels developed in various countries include: (1) high toughness and high wear resistance mold steels, such as VascoDie (8Cr8Mo2Vsi) steel from the American vanadium alloy steel company, Japan Datong Special Steel Company DC53 steel, etc .; (2) Low-alloy air-quenched micro-deformed steels, such as American ASTM standard steel numbers A14, A16, Japan's G04 and ACD37, etc .; (3) Flame quenching mold steels, such as Japan's Aichi SX5, SX105V, Japan. Hitachi HMD1, HMD5 and other steels; (4) Powder metallurgy cold work die steels, such as US CPM10V, Germany 320CrVMo13.5, etc.
The development trends of new foreign plastic mold steels are mainly in the following aspects: (1) Plastic mold steels that are easy to cut and have good polishing properties, such as 412, M-300 in the United States, YAG in Japan, EAB in the United Kingdom, and STAVAX in Sweden. 13 and so on; (2) pre-hardened plastic mold steel, such as American P20, 445, Japanese PDS, German MOVTREX-A (2312), etc .; (3) integrally hardened plastic mold steel, such as American A2, D3, and H13 (4) Corrosion-resistant plastic mold steel, such as 110CrMo17 in the national standard ISO, 4Cr13 of Swedish ASSAB, etc .; (5) Non-magnetic plastic mold steel, such as NAK301 of Datong Special Steel Company in Japan.
New types of hot work die steels successively developed abroad include: (1) high hardenability extra large forging die steels, such as 40NiCrMoV7 in the international standard ISO, 40NCD16 in the French NF standard, etc .; (2) high heat resistance die steels, such as American H10A, Japan's Hitachi Metals YHD3, and special steel company's 5Mn15Ni5Cr8Mo2V2 steel, etc .; (3) high temperature hot work die steels, such as the United States T2M, T2C, Japan's Nimowal and so on.
In order to meet the special requirements of cold work molds, new cold work mold steels developed in various countries include: (1) high toughness and high wear resistance mold steels, such as VascoDie (8Cr8Mo2Vsi) steel from the American vanadium alloy steel company, Japan Datong Special Steel Company DC53 steel, etc .; (2) Low-alloy air-quenched micro-deformed steels, such as American ASTM standard steel numbers A14, A16, Japan's G04 and ACD37, etc .; (3) Flame quenching mold steels, such as Japan's Aichi SX5, SX105V, Japan. Hitachi HMD1, HMD5 and other steels; (4) Powder metallurgy cold work die steels, such as US CPM10V, Germany 320CrVMo13.5, etc.
The development trends of new foreign plastic mold steels are mainly in the following aspects: (1) Plastic mold steels that are easy to cut and have good polishing properties, such as 412, M-300 in the United States, YAG in Japan, EAB in the United Kingdom, and STAVAX in Sweden. 13 and so on; (2) pre-hardened plastic mold steel, such as American P20, 445, Japanese PDS, German MOVTREX-A (2312), etc .; (3) integrally hardened plastic mold steel, such as American A2, D3, and H13 (4) Corrosion-resistant plastic mold steel, such as 110CrMo17 in the national standard ISO, 4Cr13 of Swedish ASSAB, etc .; (5) Non-magnetic plastic mold steel, such as NAK301 of Datong Special Steel Company in Japan.
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