Method for assembling a front cover to a bush in a pneumatic tool

Abstract

A method for assembling a front cover to a bush in a pneumatic tool is to perform a leading operation first in which a blank of front cover is worked with hydraulic forming and being roughly machined and a blank of bush is roughly machined and heat-treated and the then the front cover is joined tightly to the bush before a process of surface treatment being conducted to obtain a finished piece. Hence, in addition to work efficiency and precision of the integral structure of the pneumatic tool being enhanced, it is capable of extending life span and lowering production cost of the pneumatic tool substantively.

1 . A method for assembling a front cover to a bush in a pneumatic tool, comprising following steps:
 (1) a blank of hollow pipe shaped front cover and a blank of hollow pipe shaped bush being made in advance;   (2) the blank of the front cover being worked with hydraulic forming to be defined contour thereof;   (3) the formed cover being roughly machined;   (4) meanwhile, the blank of bush being roughly machined;   (5) the roughly machined bush being heat-treated;   (6) the front cover after step (3) and the bush after step (5) being tightly attached to each other with a welding machine;   (7) the cover joined with the bush being fine-machined; and   (8) the surface of the fine-machined front cover with the bush being treated as a finished piece for further usage.   
   
   
       2 . The method for assembling a front cover to a bush in a pneumatic tool as defined in  claim 1 , wherein the front cover being tightly attached to the bush in step (6) is performed with riveting or welding.