Powder metallurgy is a process technology that uses metal powder or metal powder as raw materials to produce metal materials, composite materials and various types of products after forming and sintering. It has the advantages of energy saving, excellent performance, high product precision, good quality stability and high and low emissions. It has been widely used in machinery manufacturing, aerospace and other fields. As a thin-walled part of the panel body, the signal panel usually has the following two manufacturing processes: first processing the surface of the panel, then trimming and punching, and then turning off the excess welding marks. This method is time-consuming, labor-intensive, complicated in steps, and waste of resources, especially for structural parts with many peripheral teeth, which is difficult to process. Second, the thin steel plate is stamped and formed at one time, and the processing is fast, but there are many serrations and burrs on the periphery, rough structure, and high-speed operation. It is easy to deform, and the strength of the tooth structure after processing is poor. At present, due to low production efficiency, high processing difficulty, and unsatisfactory product performance, many inconveniences and losses have been brought to producers and users.

In order to solve the technical problems of complex processing of the existing signal board, rough structure, and poor product performance, technicians provide a powder metallurgy mold: a mold that uses an upper punch, a lower punch and a mandrel as a whole, and the upper punch and The concave die matched with the tooth groove of the lower punch forms a powder metallurgy die for one-shot molding. The produced signal board has stable dimensions, uniform density, and high strength of the board body and side tooth structure, which greatly reduces the production cost and production cycle, and greatly improves the material utilization rate. The technical solution adopted by the powder metallurgy mold is: a powder metallurgy mold, including a female mold, upper and lower male molds matched with the cavity of the female mold, and a core rod corresponding to the cavity of the lower male mold. The key is the cavity of the female mold. The inner groove is consistent with the tooth groove on the edge of the signal board, and the bottom end of the inner groove is connected with rounded corners; the outer diameter of the core rod is equivalent to the inner hole of the signal panel, in the cavity formed by the cooperation of the die, the lower punch and the core rod Fill the powder, and then press the upper punch to form the signal panel compact. Both the upper punch structure and the lower punch structure include a concave-convex structure concave-convex structure in the outer circumferential direction consistent with the tooth groove structure of the signal disc edge, a connection part fixedly connected to the concave-mold matching portion, and a mold base for positioning上的Locating part. The size of the upper punching cavity is 99%-99.999% of the difference in the inner hole of the signal board, and the length is 1-5 times the height of the signal board. The cavity diameter in the cavity is 99.98%-101% of the tolerance of the signal disc diameter, and the height is 4-15 times the total thickness of the signal disc. The fit gap between the upper punch, the lower punch and the female mold cavity is 0.005-0.03 mm; the fit gap between the blanking and the mandrel is 0.005-0.03 mm; the outer circumference of the mandrel is the size of the inner hole of the signal board 99%-99.999% of the material, the height is 40 mm-150 mm, the female mold cavity adopts YG20, YG15 or YG8 cemented carbide material, the female mold adopts Cr12MoV alloy cavity and Cr12MoV or 45# or 40Cr or 9CrSi alloy mold sleeve. The upper punch, lower punch and mandrel are all made of metals with the brand of Cr12MoV, DC53 or SLD. The mold is suitable for hydraulic or mechanical powder molding machines with lower frame structure.

The advantages of the above powder metallurgy mold are: 1. The matching parts of the middle and female cavity, upper punch and lower punch of the powder metallurgy mold are arc-shaped, so that the product can be molded at one time without burrs, and the smoothness of the briquette is greatly improved. , Dimensional stability and density uniformity improve product quality, increase production efficiency, and reduce costs; 2. The powder metallurgy mold increases the efficiency of compression molding from 6 parts per minute in the prior art to 13 parts per minute. Improved by 116%; 3. The overall strength of the mold is high, the service life is long, and the cost is low; 4. The powder metallurgy mold has a simple structure, convenient and quick installation, and quick debugging.