We all know that producing die tools is a very tedious task. It is a powder forming method that uses external pressure in a compression die tools, also known as powder compression die toolsing. The pressing process consists of powder loading, pressing and dedie toolsing. Do you pursue reliable standards in this process, but this process must never allow "almost"...
We all know that producing die tools is a very tedious task. It is a powder forming method that uses external pressure in a compression die tools, also known as powder compression die toolsing. The pressing process consists of powder loading, pressing and dedie toolsing. In this process, do you pursue reliable standards, but this process must never allow the concept of "almost" to exist. During the press forming process, the internal and external friction between the particles and between the particles and the die tools wall causes pressure loss to cause uneven forces on each part of the green compact, so the density of the green compact is unevenly distributed. The degree of unevenness depends on the selected suppression method. There are five basic pressing methods: one-way pressing, two-way pressing, floating pressing, pull-down pressing and friction mandrel pressing. Among them, two-way pressing means that the female die tools is fixed, and the upper and lower die tools are pressed from both ends at the same time, which is also called simultaneous two-way pressing. If one-way pressure is applied first, and then a reverse one-way compression is performed at the lower end of the density, it is called non-simultaneous two-way compression, also known as post-compression, which can achieve two-way compression on a one-way compression press. When the two-way pressure is equal, the low-density layer is located in the middle of the blank, on the contrary, the low-density layer moves to the low-pressure end. The density distribution of bidirectional compaction compacts is more uniform than that of unidirectional compaction, and the density difference is reduced.
It is necessary to press hard alloy die tools with high stability and high product pressing precision. The steel substrate and cemented carbide punch should be used. The feature is that the top of the dry steel substrate is provided with a chamfer to form a guide opening. The cemented carbide punch is embedded in the steel substrate, and the cemented carbide punch and the steel substrate are interference fit , The steel base body is provided with an annular convex part, and the cemented carbide punch resists the convex part. One step further, the protrusion of the raised portion is arc-shaped. The beneficial effect of making the alloy die is that the guide opening is set to facilitate the cemented carbide punch to be embedded in the steel substrate, and the convex part can reduce the flatness requirement on the bottom surface of the cemented carbide punch, and the steel substrate and the cemented carbide are connected by hot mounting The punches fit tightly, effectively ensuring the stamping stability and stamping accuracy of the product. The structure is simple, the manufacture is simple, and the practicability is strong.
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