Guangdong alloy steel castingEnterprises must conduct a comprehensive review on the production management of castings. The project must start with the management of molds (pressing). The material, accuracy, life and delivery date of molds have a very important impact on the quality of castings. Precision casting companies generally belong to small batches and a wide variety of specifications. For example, sewing machine castings include more than 200 kinds of accessories, etc., which are more complex castings. It occupies a very important position in mold management. Therefore, our management of molds mainly includes:
1. The technical department is responsible for all liaison work with mold design and mold production factories. Strengthen the selection, evaluation and confirmation of mold factories. Choose professional mold manufacturers with advanced technology and equipment as much as possible, and strengthen the management of mold trial work.
2. The Quality Control Department is responsible for the inspection of new molds, wax molds and castings, calculation of shrinkage rates, and judgment of whether the molds are qualified.
3. The production department is responsible for the daily management of molds, such as mold registration, daily maintenance, storage, protection, evaluation, and handling of warehouse entry and exit procedures.
The first is to strictly strengthen the quality control of raw materials.Guangdong carbon steel castingThe quality of raw materials determines the quality of castings to a large extent. Choosing high-quality materials will not necessarily increase the production cost of castings.
The second item is to pay close attention to quality control in the production process. The complexity of the precision casting process determines that a full-time inspector must be set up for the first inspection, patrol inspection, and completion inspection of the "three inspections" system for each process in the production process. First, control the unqualified and transfer it to the next process.
The third item is the control of the shell making process. The number of layers is the surface layer: two, two, three, four and a half layers; paint type: 300/325 mesh zircon powder 200 mesh zircon powder
The fourth item is dewaxing quality control.Guangdong Stainless Steel CastingMany enterprises use high-pressure steam dewaxing methods. The process requires the dewaxing steam pressure to be between 0.6-0.75Mpa, and the pressure time to reach 0.6Mpa should be less than 14S, and the dewaxing time of the entire shell is completed within 6-10min. Because the thermal expansion coefficient of the mold material is much greater than the thermal expansion coefficient of the shell, too long dewaxing time will cause the mold shell to swell and crack. Therefore, after dewaxing, an inspector needs to inspect the quality of the shell to check whether the wax liquid in the shell is Take off, whether there are cracks or expansion of the shell.
The fifth item is the quality control of shell roasting, metal smelting and pouring. Shell baking is mainly to eliminate moisture and impurities in the shell, enhance the strength and air permeability of the shell, and its temperature cannot be too high or low. Generally, enterprises use the range of 950-1050°C. One thing that needs to be noted is: the operator should be careful when loading the shell and fork shell to prevent collision, squeeze, shell drop, and breakage.
The sixth item is the quality control of the post-process. The post-processes mainly include dehulling, shot blasting, pouring riser removal, repair welding, rough grinding, shaping, heat treatment, sand cleaning, mechanical polishing, pickling passivation, electrolytic polishing, spraying and other processes.
As a guaranteeCoffee machine accessoriesThe casting quality meets the technical requirements for delivery and acceptance, and must be fully inspected in accordance with the casting drawings, investment precision casting technical standards, and the inspection contract submitted by both the supplier and the buyer. The inspection mainly includes appearance quality inspection, internal quality inspection and other quality inspections.
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