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Mold production cost refers to the sum of the expenses paid by the company for the production and sale of molds. The development of modern science and technology has led to the development of molds in the direction of high-precision and multi-functional automation, and correspondingly increased mold production costs. Mold production costs include raw material costs, external component costs, equipment depreciation costs, operating expenses, and so on. It is divided into production cost and non-production cost in nature. The mold production cost we are talking about refers to the production cost that is directly related to the mold production process. There are too many types of molds, and there will be differences in cost accounting, but the factors that determine the cost are roughly the same. Taking plastic molds as an example, briefly introduce the cost of developing a set of molds:
1. The cost of mold blanks. The mold blanks are usually made of S45C or S50C. The commonly used mold blanks are standard products. The domestic mold factories generally purchase LKM mold blanks. The price of standard mold blanks is relatively cheap, but the size is too large. For products that exceed the size range of the standard mold base, additional customization is required. For example, the commonly used large nozzle mold base size ranges from 150mm x 150mm (referred to as 1515 series) to 600mm x 800mm (referred to as 6080 series). If the size exceeds 600mm x 800mm, additional customization is required, and the cost is generally 2-3 times that of standard mold blanks.
2. The material cost of the front mold core and the rear mold core is based on different injection material characteristics and mold life.
How to choose mold steel?
(1) It is related to the characteristics of plastic materials. For example, PVC plastic will produce corrosive acid gas during production. If ordinary steel is used, the mold is easy to rust, so use corrosion-resistant steel, such as 2083, S136H, etc.
(2) Related to product requirements, there are some very demanding transparent products, such as optical lenses and spectacle lenses. This requires steel with very good polishing properties, such as S136. If the wrong steel is selected, the mold will be thrown into a mirror in the later stage. , You will find obvious material lines, which cannot be eliminated by polishing, and the products made by such a mold cannot meet the requirements.
(3) It is related to the life of the mold. Even the steel of the same grade will have a high or low price. Of course, the quality of high-priced materials will be better. If the life of the mold does not need to be high, you can choose relatively cheap steel.
3. The cost of the hot runner (If it is a plastic mold, the hot runner may be used, but the die-casting mold and the stamping mold are not.
4. Selection of mold materials. In the mold cost, the material cost accounts for 15% to 20% of the mold production cost, especially due to the different materials of the mold working parts, the cost varies greatly.
Therefore, the mold material should be selected correctly, so that the material category of the mold working parts should first be coordinated with the required mold life, and various measures should be adopted to give full play to the effectiveness of the material. For example: the cost of copper material (mainly used for electrical discharge machining or to make parts with special heat dissipation requirements).
5. The cost of row position or sloping top.
6. The cost of mold processing equipment processing, such as: the cost of lathe processing, the cost of milling machine processing, the cost of grinding machine processing, the cost of CNC CNC machine tool processing, the cost of EDM electrical discharge processing, the cost of wire cutting, the cost of mold group, The cost of machining is generally calculated by the hour. Mold processing equipment is developing towards high efficiency, high precision, high automation, and multi-function, which increases the cost of molds accordingly. But this is necessary to maintain and develop mold production. The efficiency of these equipment should be fully utilized to improve the efficiency of the equipment.
7. The cost of mold design. The cost of mold design has a relatively large relationship with the difficulty of design. Of course, products with simple structures,the cost of molds with higher requirements will be higher.
8. The management costs of the factory. These costs include the labor of the management staff and the expenses needed by other engineers to follow up the project. Generally, the larger the scale of the factory, the higher the cost in this respect, and the smaller the factory, the lower the cost in this respect.
9. The profit of the factory. The cost of a set of molds is roughly determined by the above factors, each of which can be further elaborated, and it may be unpleasant to write too long.
10. The precision of the mold. The precision of the mold will cause the cost of processing. The precision and rigidity of the mold should be compatible with the product parts and production batch requirements of the customer.