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Brief Analysis of Plastic Mold Desalination Process
Desalination treatment refers to a chemical heat treatment process in which nitrogen atoms infiltrate the surface of the workpiece in a certain medium at a certain temperature. Nitrided products have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance. The plastic mold can be nitrided.
The hardness used on plastic molds is generally 480~520HRC. Nitriding treatment is also available. Because heat treatment is required and processing is more difficult, the price of the mold is more expensive. If it needs heat treatment to a hardness above 40HRC, the mold Generally it is difficult to use mechanical processing, so it is necessary to do rough machining of the workpiece before heat treatment, which is: water hole, screw hole, and tapping must be done before heat treatment, otherwise it will be time-consuming to anneal and redo In accidents, this kind of steel is also commonly used in plastic molds, so there are many brands. Common brands are: ASSAB (ASSAB) code is: 8407; THYSSEN (THYSSEN) code is GS344ESR or GS344EFS. (Generally, GS344ESR is used for order parts, and GS344EFS is used for moving parts); Japan's Datong Steel DAIDO STEEL HI (mostly designated by Japanese customers), there are still many brands, because they are not commonly used, so we can not list them all.
X45 Ni Cr Mo 4 cold work steel, AISI 6F7 European number: DIN 1.2767, this kind of steel has a factory hardness of HB260 and requires heat treatment. The general hardness is 500 ~ 540HRC. European customers use this steel. This steel has good toughness and good toughness. The light effect is also very good. Because this steel is not common in South China, there are not many brands, such as THYSSEN GS767.
X42 Cr 13 (stainless steel), AISI: 420 STAVAX DIN: 1.2083, factory hardness HB180~240, need heat treatment, hardness 480~520HRC, not suitable for nitriding heat treatment (cracking at sharp corners). This steel has good corrosion resistance and polishing effect, so generally transparent rubber parts and corrosive rubber materials, such as: PVC and fireproof materials, V2, V1, and V0 plastics are very suitable for this kind of steel, and this steel is also very common. Used in plastic molds, so there are many brands, such as ASSAB S-136ESR.
Tyssen (THYSSEN) GS083-ESR, GS083 GS083VAR; if you use THYSSEN, pay attention to it. If it is a transparent part, then the fixed and movable mold inserts must be GS083ESR (according to the steel plant data, ESR electroslag remelting is to improve The crystals of the steel are uniform, and the polishing effect is better). It is not a transparent plastic part. The movable mold part generally does not need high smoothness. Ordinary GS083 can be used, because the price of steel is cheaper and does not affect the quality of the mold. This steel material is sometimes Customers will also require it to be used as a mold base. Because of the anti-rust relationship, it can ensure the smooth water transportation of the cooling pipe to achieve a stable production cycle. There are still many brands of this steel grade, which can not be listed.
X 36 Cr Mo 17, DIN: 1.2316, AISI 420 STAVAX, factory hardness HB265~380, depending on the specifications of the steel plant, if it is a transparent plastic part, this steel is generally not used, because when it is polished to a high finish, due to the hardness If it is not enough, it is easy to have pit patterns. At the same time, it is also easy to have flower marks in beer plastics. It needs to be polished frequently. Therefore, 1.2083 ESR is heat treated and hardened to 480 ~ 520HRC, which saves a lot of trouble (although the hardness of this steel is not high, the mechanical The cutting is easier, and the mold completion cycle is shorter).
Most of this steel is used in medium-priced molds with anti-rust function, such as corrosive plastic materials, such as the PVC, V1, V2, and V0 mentioned above. This steel is also commonly used in plastic molds, and the brand is also many. ASSAB (ASSAB) S-136H, factory hardness is HB290~330, Desheng Steel Works (THYSSEN) GS316 (HB265~310), GS316ESR (30~34HRC), GS083M (HB290~340), GS128H (38~42HRC) ), DAIDO PAK90 (HB300~330).