What are the requirements for injection molding of household appliances?

Injection molding of household appliances has high requirements in appearance, dimensional accuracy, performance, production efficiency, etc. The following is a detailed introduction:

Appearance requirements

surface quality

Glossy: The appearance of household appliances usually needs good glossiness, such as refrigerator doors and air conditioning housings. Generally, the glossiness should be uniform and the deviation should be controlled within a small range to improve the overall texture and aesthetics of the products.

Color uniformity: the color should be uniform without obvious color difference. For the same batch of products, the color difference should meet the relevant standards. For example, the △E value should be generally controlled within 2 to ensure the consistency of product appearance.

Flawless: the surface should be free of scratches, bubbles, flow marks, weld marks and other defects. For example, any tiny flaw on the surface of the mobile phone shell will affect the quality of the product, so the control of surface flaws is extremely demanding.

Appearance modeling

Conform to the design drawings: injection molding is carried out in strict accordance with the requirements of the design drawings to ensure that the shape, radian and lines of the products are consistent with the design. For example, the shape of the TV frame should accurately reflect the design style and characteristics.

Decorative structure: For household appliances with decorative structures, such as decorative strips and patterns of some household appliances, it is necessary to ensure that these structures are clear and complete, and there are no problems such as deformation and lack of materials, so as to enhance the aesthetics and uniqueness of the products.

Dimensional accuracy requirements

Overall size deviation: The overall size deviation of household appliances should be controlled within a small range. For example, the diameter deviation of the inner barrel of the washing machine is usually controlled within ±0.5mm to ensure its assembly accuracy with other components.

Accuracy of key dimensions: For the key dimensions that affect the function and assembly of products, the accuracy requirement is higher. For example, the dimensional accuracy of the thickness and length of air-conditioning fan blades directly affects its air volume and operational stability. Generally, the thickness tolerance is controlled at ±0.05mm and the length tolerance is controlled at 0.1 mm..

Assembly size matching: the assembly sizes of injection molded parts and other parts should be matched with each other. The dimensional accuracy of structures such as buckles and slots should be ensured to be closely matched during assembly, without looseness or over-tightness, so as to ensure the overall structural stability of the product.

performance requirement

mechanical character

Strength: Household appliances may be subjected to various external forces during use. For example, the refrigerator door needs to bear frequent opening and closing forces, so the injection molded parts should have sufficient strength, such as tensile strength and bending strength, to prevent cracking or deformation.

Toughness: it has good toughness and can withstand a certain degree of impact without breaking. For example, during transportation and use, household appliances may be slightly collided, and injection molded parts need to have enough toughness to resist impact.

Electrical performance: For some injection-molded parts involving electrical functions, such as socket housings and electrical control boxes, they should have good insulation performance. For example, the insulation resistance should be more than 100MΩ, and the dielectric strength should meet the requirements of relevant standards to ensure the safety of use.

Weather resistance: Some household appliances may be exposed to the outdoor environment, such as the outdoor air conditioner shell, which requires that the injection molded parts have good weather resistance, can resist the influence of natural factors such as ultraviolet rays, rain and temperature changes, and prevent discoloration, aging and embrittlement.

Production efficiency and cost requirements

production efficiency

Molding cycle: under the premise of ensuring product quality, shorten the injection molding cycle as much as possible and improve production efficiency. By optimizing injection process parameters and mold design, the cooling time and mold opening and closing time can be reduced. For example, the hot runner mold can shorten the molding cycle by 20%-30%.

Automated production: Adopt automated production equipment and processes, such as robot picking and auto production line, to improve the automation of production, reduce manual intervention, and improve production efficiency and product quality stability.

cost control

Material cost: reasonably select injection molding materials, and try to reduce the material cost under the premise of meeting the product performance requirements. At the same time, it is necessary to control the loss rate of materials and reduce the generation of waste and defective products by optimizing the mold design and injection molding process.

Energy consumption cost: optimize the operation parameters of injection molding equipment and reduce energy consumption, such as adopting energy-saving injection molding machines and reasonably adjusting heating temperature and cooling time, so as to reduce production costs.