Valve rocker shaft mounts course design

Abstract:The spot machining industry is undergoing structural changes, the design and improvement of process tooling has become a necessary condition for the survival and development of enterprises, and the design and improvement of process tooling directly affects the quality and performance of valve rocker arm shaft bearing. As a traditional and dynamic industry, the diesel engine industry has made rapid progress in the past ten years, and in the new economic era, the diesel engine industry has shown a new development trend, which has made new changes to other quality and performance.

In this paper, the role and process analysis of the valve rocker arm shaft support are first introduced, and then the blank size is determined, and then the process specification freelance poem is carried out.

Chapter 1 Analysis ......... of Parts4

The role of the part .........4

Process analysis of parts .........4

Chapter 2 Determine the blank, draw the blank parts together .........4-5 Determine the ......... of the blank4-5 Chapter 3 Process Specification Design .........6-16

The selection of the positioning datum .........6

Develop the routing .........6

Choose processing equipment and knives, clamps, measuring tools, .........7

The design of the processing process .........7-12

Time quota calculation .........12-16 Chapter 4 Fixture Design .........17-19 The fixture design of the 40th process .........17-18

The design of the first process fixture .........18-19

Conclusion.........19

Acknowledgments .........20

References .........20

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Selection of fine datum: the lower end face of the valve rocker shaft support is both the assembly datum and the design datum, and it is used as the fine datum to make the processing follow the principle of datum overlapping, and realize the positioning mode of the ten planes of the V-shaped block (the V-shaped block is clamped by a linkage clamping mechanism). 20 (+ hole and left and right end faces are used as the bottom surface as a benchmark, which makes the process route follow the principle of "benchmark unity", the area of the lower end face is relatively large, the positioning is relatively stable, and the clamping scheme is also relatively simple, reliable and easy to operate.

Selection of coarse datum: Considering the following requirements, select important surfaces and important holes of the part as datums.

First, under the premise of ensuring that each processing surface has a machining allowance, the machining allowance of the important hole or surface is as uniform as possible, in addition, it is necessary to ensure the reliability of positioning clamping, the convenience of clamping, and reduce the auxiliary time, so the coarse datum is the upper end face.

Of course, it supports the rocker shaft and is used to keep the relative position between the valve and the rocker arm fixed.

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1 The role of the part.

This part is the valve rocker arm shaft support in the rocker arm joint in the Type 1105 diesel engine. The mm hole is equipped with a rocker arm shaft, and a rocker arm of an intake and exhaust valve is installed at both ends of the shaft. A decompression shaft is installed in the mm hole to reduce the pressure in the cylinder and facilitate the start of the diesel engine, and the distance between the two holes is mm, which can ensure that the decompression shaft opens the valve on the rocker arm to achieve decompression.

The part is connected to the cylinder with an M10 screw through a mm hole. This part is an important part of the diesel engine valve control system.

Process analysis of parts .........

Analyze the drawings of the parts, the views of the drawings are not clear, the dimensions are complete, the parts of the parts can be clearly expressed, the technical conditions are reasonably marked, the surface roughness is marked, the dimensional tolerances are complete, and the processing requirements can be fully expressed. The processing surface of the part is divided into two types, mainly the processing of holes, and the processing of cylindrical end face planes. Redraw the part drawing on the A3 drawing, see the attached drawing for details.

The main processing part is described as follows:

Holemaking. The part has a total of 4 holes to be processed, wherein mm, mm hole processing requirements are higher, the spacing between the two holes mm, the distance between the center of the mm hole and the bottom plane mm, the distance between the center of the mm hole and the bottom surface is 49. There are parallelism requirements, surface roughness, need to be finished, mm small hole can be drilled directly, and another oblique small hole can be drilled directly.

Processing of surfaces. The part needs to be processed in a plane of 22 36 bottom surface accuracy requirements are higher, is the fine datum of the follow-up process, needs to be finished, the upper end face is required to be high, rough milling can be. 26 cylindrical two ends face rough milling, 28 cylindrical two ends roughness requirements, to finish milling.

From the above analysis, it is known that the processing of the part should be processed first, and the hole should be based on the surface. Ensure the distance and parallelism between the center of the hole and the bottom surface.

Process specification design to determine the blank:

The form of manufacture of the blank:

The material of the part is HT200, according to the factors that should be considered in the selection of the blank, the part is small in size, the shape is not very complex, the roughness is obtained on the outer surface by not removing the material method, because the production type of the part is batch and mass production, and the production cost of sand casting is low, and the equipment is simple, so the part blank adopts sand casting.

The design of the blank:

Because the production type is batch and mass production, considering the production cost of the blank and the cost of machining, the blank manufacturing method is sand casting, 18, 16 holes need to be finished, and the machining allowance should be left, so the holes should not be cast, and other small holes are not cast.

Check the metal processing technology and tooling design (Huang Rulin, Wang Qun editor-in-chief, Chemical Industry Press) to determine the machining allowance:

Sand casting, tolerance grade: (CT7 9) check table 1 - 6, take CT8

Processing allowance grade: 11 13g Check table 1 - 8, take g

Cutting allowance: check table 1 9, the basic size is less than 100mm, so the machining allowance is one-sided, double-sided.

Casting size tolerance value: check table 1 11 basic size less than 50mm, take, less than 30mm, take.