How to make hydraulic power steering housing end cap?

The hydraulic power steering machine is mainly composed of shell, shell cover, screw assembly (including valve core, screw and torsion rod), rack piston and toothed fan shaft assembly, and screw assembly, rack piston and toothed fan shaft assembly are all arranged in the space composed of shell and shell cover. Wherein the housing adopts a design scheme of opening at one end and a closed other side, and the housing cover is disposed at the open end of the housing. On the one hand, the shell cover is susceptible to impact under special working conditions, resulting in its low service life and many materials; On the other hand, the above structure still has the following shortcomings: first, the casting and machining process of the shell is complex, and the production cost is high; Second, in the process of steering machine assembly, the assembly of a large number of small parts (shaft seals, etc.) in the shell needs to be completed in deep holes, which is difficult to operate and has high work intensity, thereby increasing manufacturing and assembly costs.