Research On Processing Technology For Combining Deep Bore On High-precision Of Unsymmetrical Parts

This paper is regarding automatic valve named xxx-4 as the research object. The craft about how to machine a knockdown hole system in a stainless steel part that is not symmetrical is studied primarily. The automatic valve named xxx~4 is the part of some type weapon. This part is to control the air path of the charge system. In the part named XXX-4 valve there are some holes with strict dimension, position tolerance and roughness . It is very difficult to machine. The machining of the part is all along a technical problem that is solved urgently by us. This type of valve named XXX-4 is developed on the foundation that the XXX-3 type valve. It adopts a coupling configuration to increase working dependability. The shape is not symmetry construction. The material is an anti- hydrogen frailty austenitic stainless steel. There are some bigger technical difficulties in machining the knockdown inside the hole system. We have many experiments on XXX-3 and got some achievement without the key technology, so we can' t reach ideal quality and efficiency. So it did not used for the actual productionWe go deep into the boring technology of XXX-4 valve and carefully analyse the object's construction function and thedifficult point of craft. The paper point resolves below technique problems:According to design request of the part and characteristics of the material, optimize machining parameter and main parameter of the tool by the hand over experiment method, get the science reasonable parameter that can satisfy request of design. It is the base to design tools.According to not symmetry construction characteristics of the parts we designed the outset from the craft system, solved the moving equilibrium design of the craft system by the test technique of the moving equilibrium at the spot and reduced the precision influence which is caused by anisomerous construction of the work piece.Make use of the analysis method of limited element, we designed the high rigid carbide tool that can be cooled inside. We solved some problems those can influence precision: stretch out longer, rigidity of the tools not enough and abrasion resistance not enough and so on. It makes the tool manufacturing cost consumedly lower. The tool pole can repeat the usage. The tools are easy to make.Using the accuracy measure instrument we can do precision measure. We just need a time to clamp to finish machining, so avoided the error influence because of repetition to install work piece. According to the dimension error that is actual to measure at process of work piece and using the technique of the homologous error compensates, we can avoid the error influence because of abrasion of tool, checking tool and distortion of tool and so on. So precision and qualified rate can be improved.Make use of the analysis method of limited element, distortion of the work piece that is caused by clamping iscalculated. According to request of machining precision reasonable clamping moment is made sure. Using the tool of precise torque screw can solve the distortion problem in the process of clamping. The work piece is installed dependable. The distortion is small. So the force of clamping can be controlled reasonable.The SPC analysis method is used to analyze the main element, analyze ability of craft and get the corresponding improved measure. All of above, these measures can improve product efficiency and percentage of certified product and can offer reference to the machining of similar parts.Adopting this craft we can lift high-efficiency, reduce the manufacturing cost, process the quantity stability. If this lesson can be success, we will get the importance social performance with the economic performance.