A spring brazing fixture and its spring pressure control method

Abstract

The invention discloses a spring brazing clamp and a spring pressure control method thereof, and belongs to the technical field of tools. The spring brazing clamp comprises a lower cover, a plurality of vertical rods, pressing plates, clamping plates, springs and an upper cover; the vertical rods are connected between the lower cover and the upper cover, the lower ends of the vertical rods are connected and fixed to the lower cover, and the upper cover can slide on the vertical rods; the springs are arranged at the extension parts, above the upper cover, of the vertical rods, and the pressing plates and the clamping plates are arranged at the two ends of the springs respectively. On the basis, by effectively controlling the amount of compression of the springs of the spring brazing clamp, continuous and stable pressure on brazing parts can be maintained; according to the width of cores to be welded, the thickness of bimetallic plates and other specific conditions, scientific and reasonable calculation is carried out, the condition that the pressure generated by the theoretical amount of compression of the springs is smaller than the actual work pressure is avoided, and the risk that fins are collapsed by the springs and parts are scrapped is avoided.

Description

Technical field [0001] The invention belongs to the technical field of tooling, and relates to a vacuum brazing technology of an aluminum plate-fin radiator, in particular to a spring brazing fixture and a spring pressure control method thereof. Background technique [0002] The vacuum brazing of aluminum plate-fin radiator is to heat and heat the structural parts in a vacuum state, so that the brazing filler metal is melted in a suitable temperature and time range, and it is fully wetted and dissolved with the solid metal under capillary action , Diffusion and brazing to achieve an advanced welding method. In this process, it is necessary to keep the structure in a compressed state, and to maintain the stability and balance of the structure, it is necessary to use a brazing fixture or an auxiliary tool that can achieve the compression effect. For example, in traditional technology, a large number of stainless steel castings are used as the load to keep the welding position tigh...

AI Technical Summary

Problems solved by technology

This makes the preconditions of the current spring compression calculation method of the production unit no longer valid.

[0005] Moreover, due to spring processing errors, materials, etc., the spring state change trends used in actual production are not consistent. Even for the same batch of springs, there are errors in the free height within a certain range, and it is impossible to change the state every time. Replace with a brand new standard spring, as the use time increases, the state and performance of the spring are gradually changing, and the trends of these changes are not consistent

This leads to the fact that the compression calculated by the current calculation method of spring compression is different from the compression that the spring should actually control. When the springs used on the fixture are old springs, the free heights of these old springs are uneven and uniform. If the height of the new spring is lower than the standard, the actual pressure generated by the compression calculated according to the state of the new spring will be greater than the calculated pressure, which is also the withstand pressure of the core, so that the collapse of the fins will affect the brazing quality of the core. , and even directly lead to structural parts becoming waste products

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