Analysis of powder pressing technology: the key to improving product quality and production efficiency

Powder pressing technology is an important material forming method, widely used in many fields such as automobiles, aerospace, and medical equipment. The following is a detailed analysis of powder pressing technology and key measures to improve product quality and production efficiency through this technology.

一、Analysis of powder pressing technology
1. Definition and principle
Powder pressing technology refers to a powder forming method that uses external pressure in a die, also known as powder molding. The process mainly includes three steps: powder filling, pressing, and demolding. During the pressing process, the powder particles are tightly combined under pressure to form a blank with a certain strength and density.

2. Pressing method
Unidirectional pressing: the female die and the core rod are stationary, and the upper die punch is pressurized in one direction. It is suitable for products with a height-to-diameter ratio of H/D≤1 or sleeve parts with a height-to-wall thickness ratio of H/T≤3.
Bidirectional pressing: the female die is fixed, and the upper and lower die punches are pressurized from both ends at the same time. Applicable to parts with H/D≥2 or H/T≤6, and the density distribution of the pressed green sheet is more uniform than that of unidirectional pressing.
Floating pressing: the lower die punch is fixed and the female die can float up and down. Applicable to parts with H/T≤6 or H/D≥2.
Pull-down pressing: also known as pull-down pressing and strong dynamic pressing. Applicable to parts with H/T≤6 or H/D≥2, as well as some powders that cannot be floated.
Friction core rod pressing: Applicable to pressing slender and thin-walled parts with H/T>6-10.
3. Powder requirements
Bulk density: The bulk density of the powder should be increased as much as possible to reduce its compression ratio.
Fluidity: The powder has good fluidity and small internal friction between particles, which is conducive to filling various parts of the mold.
Water content: The water content of the powder should be controlled appropriately to affect the density of the green sheet.
Fragility: The powder is easy to crush under pressure, which is conducive to forming a dense green sheet.

二、Key measures to improve product quality and production efficiency
1. Optimize powder material selection
Select high-purity and high-performance powder materials according to the product's use environment and performance requirements. Strictly screen and clean the raw material powder to ensure the purity and particle size uniformity of the raw material.

2. Accurately control process parameters
During the powder pressing process, the parameters of each process step (such as temperature, pressure, time, etc.) are accurately controlled. By optimizing the pressing process parameters, such as pressing pressure, pressing temperature and pressing time, the density and strength of the blank are improved, thereby enhancing its performance stability.

3. Adopt advanced mold design
Optimize mold design, reduce cutting or no cutting, and improve material utilization. At the same time, the use of advanced technologies such as combined die punching and multi-action pressing methods can press complex shapes of blanks and improve product accuracy and reliability.

4. Introduce automated production lines
Automated production lines can significantly improve production efficiency and reduce human errors and waste. By introducing automated equipment and control systems, the automation and intelligence of powder mixing, pressing, sintering and other processes can be realized.

5. Implement strict quality control
Establish a strict quality control system to conduct comprehensive inspection and control of raw materials, production processes and products. Reduce scrap rate and rework rate by improving product quality, thereby reducing production costs.

6. Continuous technological innovation and R&D
Continuously pay attention to industry dynamics and technological development trends, and actively introduce and develop new technologies, new processes and new equipment. Through technological innovation and R&D, continuously improve the level and competitiveness of powder pressing technology.

In summary, powder pressing technology has significant advantages in improving product quality and production efficiency. By optimizing powder material selection, accurately controlling process parameters, adopting advanced mold design, introducing automated production lines, implementing strict quality control, and continuous technological innovation and R&D, the level and competitiveness of powder pressing technology can be further improved, making greater contributions to the development of modern industry.