Air tightness detection device for shell die casting

Abstract

The invention discloses an air tightness detection device for a shell die casting, and the device comprises a bottom plate which is provided with at least one die casting positioning region. The lifting pressing plate is arranged above the bottom plate to ascend and descend, and a plurality of die casting pressing assemblies are vertically installed at the lower end of the lifting pressing plate; the sealing groove encloses the die casting positioning area, and a sealing strip is arranged in the sealing groove in an embedded mode; the arc-shaped grooves are formed in the two ends of the die casting positioning area, and the ends of the sealing grooves extend to be communicated with the arc-shaped grooves; the end sealing columns are installed at the two ends of the die casting positioning area and embedded into the arc-shaped grooves, and the outer sides of the end sealing columns are connected with sealing rings in a sleeved mode, and the sealing rings make contact with the ends of the sealing strips. And the extrusion sleeve is axially arranged on one side of the end sealing column and is driven by an execution component on the bottom plate to axially move to extrude the sealing ring. According to the invention, the material cost of the sealing strip is not increased under the condition that the product structure is not allowed to be changed.

Description

technical field [0001] The invention relates to the field of air tightness testing of die castings, in particular to an air tightness testing device for die castings of casings. Background technique [0002] For shell die-casting parts, it is often necessary to perform an airtightness test. During the test, the holes at both ends of the shell die-casting part need to be sealed. The existing sealing structure is a sealing structure that imitates the product structure. It usually includes a semicircular raised block, a flat plate, a semicircular sealing strip, and a large surface sealing strip. The contact point of the sealing strip is the edge of the cut surface of the semicircle and the large surface of the sealing strip. In the process of contacting the sealing structure with the product, the pressurized cylinder of the upper template is used to press the sealing strip and the product together, and the sealing effect is achieved by the compression of the sealing strip. ...

AI Technical Summary

Problems solved by technology

[0003] In the actual production process, due to the limitation of the product structure, there is a sharp angle of 90° at the interface between the large end surface of the product and the semicircle. The material of the sealing strip currently used is generally rubber (mainly nitrile), and this material is generally It has oil resistance, heat and oxygen aging resistance, abrasion resistance, chemical corrosion resistance, elasticity, cold resistance, and flex resistance, but poor tear resistance. It is easy to be cut off by the product during the extrusion and sealing process at the sharp edge of the product, resulting in The seal fails, and the sealing strip needs to be replaced frequently, which increases the cost of equipment use

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