Fixtures for clamshell rear muffler package welding for exhaust systems

Abstract

The invention relates to a welding fixture for a welding fixture for a clamshell-shaped rear silencing bag of an exhaust system. The welding fixture comprises an upper die positioning plate and a lower die positioning plate, wherein the upper die positioning plate is connected with the openable end of equipment, an upper die base is fixed to the upper die positioning plate, an upper die pressing positioning block and a positioning guide column matching sleeve are fixed to the upper die base, and a visual sensor is inlaid in the upper die base; and the lower die positioning plate is fixedly connected with the lower portion of the equipment, a lower die base is fixed to the lower die positioning plate, a lower die pressing positioning block is fixed to the lower die base, the lower die base is hollow, a workpiece jacking system is mounted in the lower die base, a pipe orifice pin assembly advancing and withdrawing mechanism is mounted on the outer side of the lower die base, a pipe orifice positioning and clamping assembly is mounted on the pipe orifice pin assembly advancing and withdrawing mechanism, and a pipe orifice in-place sensor is mounted on the pipe orifice positioning and clamping assembly. The semi-automatic welding tool is easy to operate and maintain, high in practicability, and high in production controllability, the welding quality is high, the threshold requirement for a required driving power source is low, and equipment development and maintenance cost is reduced for enterprises.

Description

technical field [0001] The invention relates to a clamp used for clamshell-type rear muffler package welding of an exhaust system, and belongs to the technical field of pressure welding fixtures. Background technique [0002] Nowadays, in the automotive industry, the design forms of after-discharge packaging for passenger cars mainly include curling type, welded type of cylinder end cover and clamshell-type after-discharge type, and the product process design of clamshell-type after-discharge type has gradually become It is the mainstream form in the industry, and at the same time puts forward higher requirements for the consistency and pass rate of products after welding. [0003] At present, the following two methods are mainly adopted for welding tooling of clamshell type post-disposal welding tooling: 1. The upper and lower clam shells are packaged and positioned in an integrated way, which mainly controls the shape of the clam shell. The welding gap is controlled by spe...

AI Technical Summary

Problems solved by technology

Defects of this scheme: First, the full-shaped positioning of the upper and lower clamshells requires extremely high requirements for the size of the clamshell parts, high requirements for the production and processing of the upper and lower molds, and requires a lot of processing time. The subsequent fitter grinding requirements are high and time-consuming. The long-term stability of the product and the wear of the mold of the product have high requirements. After the welding tooling is worn out, it is difficult to repair, and the cost is extremely high; there is no control on the nozzle, so that the oil pressure when the upper and lower molds are combined directly acts on the nozzle. On the core tube of the component, it is easy to deform the nozzle, which will affect the subsequent welding, and even need to increase the flaring process to make it have assembly and weldability

[0004] 2. Compared with the first scheme, this scheme increases the control of the nozzle, uses the positioning pin of the nozzle to support the nozzle to a certain extent, and reduces the ballast force on the nozzle when the upper and lower molds are combined. Both the upper and lower molds are made of copper. The problem is the same as the previous one; the defect of this scheme: although the force nozzle positioning pin is added to prevent the nozzle from deforming, the state of the nozzle has improved, but it has not reached the best state; the main body of the fixture Copper material is used, and the upper connecting plate and positioning pin components are made of iron, which makes the overall quality of the tooling larger, and it is inconvenient to transport and replace the tooling. At present, the maximum bearing capacity of pressure welding equipment in equipment factories is usually within 500kg. It is difficult to control the overall quality of the tooling and fixtures within the range, and more can only reduce the function of the fixture and thin the upper and lower templates; this solution reduces the function of the tooling and reduces the service life of the tooling, which has certain risks. At the same time, lean production is implemented for production , rapid mold change has a substantial impact

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