Temperature self-adjusting injection punch head

Abstract

The invention discloses a temperature self-adjusting injection punch head. The temperature self-adjusting injection punch head comprises a punch head base, a punch head shell and a punch head body, acooling water inlet pipe is arranged on the center of the punch head base and the center of the punch head body, a plurality of cooling branch pipelines are uniformly distributed on the periphery of the cooling water inlet pipe, a water outlet cavity communicated with all the cooling branch pipelines is formed in the punch head base, and a water inlet flow adjusting mechanism is arranged on the punch head body; and control switches capable of controlling the flow of each cooling branch pipeline according to the temperature change are arranged in the water inlet flow adjusting mechanism. In theworking state, when the temperature of the temperature self-adjusting injection punch head is unevenly distributed, the pressure of temperature sensing cavities with high temperature is large, the corresponding flow control switches are thus pushed to increase the coolant flow in the control area, and the coolant flow in other cooling areas is reduced through the pressure action of a pressure adjusting cavity, so that the temperature of the punch head is balanced, the circumferential thermal expansion amount of the punch head is kept consistent, the punch head can always maintain good roundness and coaxiality when being matched with and injection chamber, and the service life of the punch head is thus greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of die-casting equipment, in particular to a self-adjusting temperature injection punch. Background technique [0002] At present, die casting machine is a kind of pressure casting equipment. Die casting has the advantages of high dimensional accuracy, fast production speed, good mechanical properties of castings, and smooth surface of castings. It is generally used for large-scale non-ferrous metal casting. During die casting, the temperature of the metal solution can generally reach 500~700°C. The injection punch is a part of the die-casting machine. Its function is to quickly press the high-temperature metal solution in the injection chamber into the mold cavity under the action of the hydraulic push rod, and maintain a certain pressure for a period of time until The casting is finally cooled and formed before entering the next injection cycle. [0003] When the existing injection punch is injected, the...

AI Technical Summary

Problems solved by technology

If the injection punch and the injection chamber are not in the same axis, there will be a lot of friction, which will cause the wear of the injection punch and the injection chamber

However, the injection punch and the injection chamber are in contact with the high-temperature molten metal for a long time, and they will be deformed by heat. The uneven temperature distribution on the injection punch will lead to uneven thermal deformation.

As a result, the roundness of the injection punch will change, which will intensify the friction between the injection punch and the injection chamber, resulting in wear; and it will also cause the local area between the injection punch and the injection chamber to be too small or too large gap, resulting in leakage

The leaked molten metal will cause great friction, scratches or even jamming of the injection punch after cooling, seriously affecting the service life of the injection punch and the injection chamber

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