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Vacuum Heat Treatment Furnace

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Garment cutting machine high speed steel straight blade vacuum heat treatment

The garment manufacturing industry has developed rapidly in recent years. After China’s entry into the World Trade Organization, garment exports have continued to expand and product styles have increased, and the garment industry has achieved considerable development. With the continuous improvement of people’s living tastes, higher requirements are also put forward for daily wear items. This has brought huge business opportunities to domestic garment factories and manufacturers of design, processing equipment and cutting tools. The tool is mainly made of W6Mo5Cr4V2 steel plate by blanking. Originally, it was quenched with salt bath oil and tempered at low temperature in the external heat treatment factory, and then the salted oil stain was removed by grinding process in the factory, which was time-consuming and expensive. However, using a vacuum quenching furnace for nitrogen gas quenching heat treatment, a thinner high-speed steel plate can be used for quenching and tempering and then quickly polished on a special polishing machine. The blade does not undergo oxidation and decarburization, and the surface is bright and clean, which can save the grinding process. , reduce material costs and achieve better economic benefits.

It is of great significance to use bright vacuum heat treatment and polishing technology to replace the traditional production process of oil quenching and grinding technology after salt solution heating in the production of new computer cutting machine blades. First, a thinner high-speed steel plate can be used after vacuum quenching and tempering, and then quickly polished on a special polishing machine, the surface is bright and clean, and it is estimated that it can save about 20% of the material cost; secondly, it can save the grinding process and reduce labor costs. cost, and achieve better economic benefits; thirdly, the blades and linings do not produce oxidative decarburization, so that the hardness is uniform, and the appearance is particularly smooth, thereby improving the quality indicators such as product performance. Therefore, the new technology can reduce the consumption of high-speed steel materials and production costs, and improve the quality of products.

A factory used to use W6Mo5Cr4V2 high-speed steel to manufacture blades and tool holder linings, and the production process of oil quenching and grinding by heating at 1200 ℃ in a salt bath furnace is now used. Nitrogen quenching and polishing process after vacuum heating and heat preservation.

Vacuum heat treatment process:

The straight blade dimensions are: length 420mm, width 24mm, thickness 0.7mm. The vacuum quenching and tempering process is shown in the figure. During vacuum heating, the straight blade is installed in the furnace by lamination and clamping. The heating time is determined according to the width of the blade. Usually, because heating in vacuum only has radiation heat transfer without air convection heat transfer, the heating is slow, so the holding time is the salt bath furnace. 2 times or 4 times the chamber furnace. After fully and uniformly heating, nitrogen is charged for gas quenching.

Tempering was carried out in a 4kW box-type experimental furnace, and the process parameters are shown in the figure. If the tempering temperature is too high, the straight blade will have no elasticity, and if the temperature is low or the time is short, the tempering will be insufficient. The actual production is tempered in a 30kW box-type protective atmosphere furnace. Considering that the temperature in the furnace is inevitably uneven, the optimal tempering parameters after quenching at 1210℃ are selected: 565℃×75min, 3 times or 4 times, which can ensure Straight blades are flexible.

Tool holder lining heat treatment process:

In order to save the material cost, a factory uses the domestically developed low-alloy high-speed steel W3Mo2Cr4VSi steel plate to make the tool holder lining, and its material cost is 20% to 30% cheaper than the W6Mo5Cr4V2 steel. For the tool holder, it is only required to ensure good wear resistance, not elasticity. It is heated to about 1160 ℃ in a vacuum furnace and then quenched with nitrogen gas. The production process parameters are: 540 ℃ × 75, 120, 60min each tempering once , can replace W6Mo5Cr4V2 steel to meet the wear resistance requirements of the tool holder lining.

Key points of vacuum heat treatment:

The higher the hardness of the high-speed steel blade after quenching and tempering, the smaller the friction coefficient and the lower the wear rate. It is necessary to control the hardness value (HRC) of the W6Mo5Cr4V2 steel cutting blade after heat treatment within 60~65. Under the premise of ensuring wear resistance and service life, the blade has good elasticity and can automatically bounce when it is bent during work. Not deformed again. A small amount of lower bainite does not affect the service life of the blade, but also increases the strength and toughness, and the elasticity is better than the full martensitic structure steel obtained by salt bath quenching. If there is insufficient quenching hardness and uneven quality of the blades processed in the same furnace during the process, or sometimes the blades will undergo plastic deformation and cannot be elastically restored, it will affect the quality of the product and the reputation of the enterprise.

The use of bright vacuum heat treatment and polishing processing technology to replace the traditional salt bath oil quenching and grinding technology to produce innovative computerized cutting machine blades can reduce material consumption and production costs and improve product quality. The hardness value (HRC) of the W6Mo5Cr4V2 steel cutting blade after heat treatment is within 60 to 65. When it is bent during work, it can automatically bounce back without deformation, which meets the requirements of wear resistance. The tool holder lining is made of W3Mo2Cr4VSi steel plate, which is quenched by nitrogen at 1160℃ and quenched at 540℃.

At present, many companies have determined the best process parameters that can ensure the quality of the blades, so that the hardness distribution is uniform, the scrap rate is reduced, the appearance is particularly smooth, and the quality indicators such as product performance are met. The market is selling well and the supply is in short supply, and it has also begun to enter the international market. Replacing the 0.9mm steel strip blade with 0.7mm thin steel strip saves the material cost for the enterprise and produces the economic benefit of increasing the profit by 20%.

Selection of vacuum heat treatment equipment: The RVGQ series vacuum heat treatment furnace produced by SIMUWU is a high-quality product for the vacuum heat treatment process of cutting tools. The good temperature control accuracy and temperature control uniformity ensure the effective progress of the vacuum heat treatment process. SIMUWU specializes in the manufacture of vacuum furnaces, has more than ten years of relevant experience, and has a good reputation in the field of vacuum furnace manufacturing. The product line includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum brazing furnace, etc., which are widely sold in developed and developing countries.