Chair Mould

Chair Mould Details

How to make a chair mold?

There are many types of chairs on the market now, mainly divided into wood, fabric, plastic, glass, and metal based on their materials. Considering the principles of practicality and economy, tables made of different materials have certain limitations in their usage. This article summarizes several points to pay attention to when making molds for plastic chairs.

To make a good chair mold, one must first choose a good mold company, as many companies can make chair molds. However, to make a good chair mold, some selection criteria are still needed. The scale and equipment of a mold company, the experience of technical personnel, and the ability to respond to unexpected situations are all manifestations of the company's strength.

Secondly, there are quality requirements, that is, the lifespan of the mold. A good set of molds can produce millions of sets, while others require repairing dozens of product molds. The lifespan of the mold should be determined based on its own production capacity. The lifespan of the mold is closely related to the hardness of the steel, and the hardness of the chair mold must reach at least HRC33. In order to control the cost, it is generally sufficient to use P20 material for around 500000 molds, and the cost of better steel materials needs to be significantly increased.

There is also a question about the style of the chair. Some customers need to make many types of chair molds, among which the same style with different flower boards does not require many molds. In this case, only one pair of molds is needed. Flower boards can be made with multiple inserts, and the finished inserts can be used for interchangeability.

Key points to note in chair mold design:

1. Firstly, designers should consider that the designed product should meet the needs of aesthetics and fashion. In terms of chair performance, they should also consider its weight, strength, stacking capacity, and load-bearing capacity, and prevent the possibility of shrinkage and deformation of the designed chair during injection molding.

2. The molding of injection molded chairs should be very easy and fast flowing.

3. Different materials of plastic chairs require the selection of appropriate mold steel materials: P20 is the most common mold steel material used for PP chair molds, which can be injected with 500K or continuously run for 2 years; Use DIN1.2738 with HRC 33-38, with a mold life of 1M or continuous operation for 3 years; 1.2083 Assab S136 ESR Harden 48-52 HRC, very suitable for PC transparent chair molds, with a mold life of at least 5M.

4. The mold parting line should be round and smooth, so that the chair after injection molding will not scratch hands. Therefore, we always pay attention to the mold injection pressure and ensure the accuracy requirements of the mold machine tool processing.

5. Wall thickness control of the mold: Uneven thickness can lead to imbalanced injection and uneven cooling time, which not only affects injection speed but also causes problems such as chair shrinkage. If the accuracy of the machine tool is insufficient, uniform thickness cannot be guaranteed.

6. When designing plastic chairs, we also need to consider their stacking capacity and load-bearing capacity. And it is necessary to prevent the possibility of deformation of the designed plastic chair shape during the injection molding process.

7. For chairs formed by gas assisted technology, the accuracy and stability of the equipment directly affect the surface quality and gas assisted effect of the product. Therefore, equipment is crucial, such as injection molding machines and gas assisted equipment.

8. The interchangeable design of chair back inserts can help users design different chairs, which is convenient and cost-effective.

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