Forging blank processing is the process of forging production. The quality and productivity of forging blanks will have an important impact on the quality, performance, service life and economic benefits of enterprises. The machining technology, equipment precision and performance of forging blank determine the quality of blank. The quality of forging blank directly affects the turning accuracy, and the turning quality affects the grinding accuracy and efficiency. Therefore, the selection of forging blank plays a very important role in the whole forging process. The selection principle of forging blank should be to reduce the production cost as much as possible under the premise of meeting the use requirements, so as to make the products competitive in the market. The next step is the selection principle of forging blank. There are the following points:

1. Process principle:

The use requirements of forgings determine the blank shape characteristics, and various use requirements and shape characteristics form the corresponding blank forming process requirements. The use requirements of forgings are reflected in its external quality such as shape, size, machining accuracy and surface roughness, as well as its internal quality requirements such as chemical composition, metal structure, mechanical properties, physical properties and chemical properties. For the use requirements of different forgings, the technological characteristics of forging materials (such as forging performance, welding performance, etc.) must be considered to determine which blank forming method to use. When choosing blank forming method, we should also consider the machinability of subsequent machine processing. Some blanks with complex structure and difficult single forming should not only consider the possibility of various forming schemes, but also consider whether these combinations will affect the machinability of machining.

2, the principle of adaptability:

The principle of adaptability should also be considered when selecting blank forming scheme. According to the structure shape, shape size and working conditions of forgings, the appropriate blank scheme is selected. For example, for ladder shaft parts, when the diameter difference of each step is not big, rod materials can be used; If the difference is large, forging blank should be used. Different working conditions of forgings lead to different blank types.

What are the advantages of forgings? Why choose forgings?

Forgings belong to building materials industry and are widely used. Conceptually, a forging is a metal that exerts pressure to shape the required shape or appropriate compression through plastic deformation.

Forging is a bar forged by forging equipment, which generally cannot forge more complicated workpieces and requires a lot of processing. However, the forging structure is dense, and internal defects are not easy to occur. It is widely used in valve seats, valve cores, valve stems, etc., and forging valve bodies are also widely used in high-pressure and strongly corrosive alloy valves.

Compared with castings, the valve body of forging valve has more uniform structure, better density, better strength integrity, better dimensional characteristics and smaller dimensional error. Directional structures (pipes) have higher performance than castings in terms of overall strength and stress.

High strength-hot forging promotes crystallization and grain refinement, makes the material achieve high strength and consistency, and reduces the variation between parts. Particle flow along the contour of the valve body is beneficial to reduce fatigue or common faults.

Structural integrity-forging eliminates internal defects, produces a coherent metallographic structure, and ensures excellent performance. In places where stress and crystal corrosion are serious, forgings can ensure long service life and trouble-free service.

Reliability-structural integrity forging eliminates internal defects, produces a coherent metallographic structure, and ensures excellent performance. In places where stress and crystal corrosion are serious, forgings can ensure long service life and trouble-free service.

Quality assurance-through the use of forgings, as well as their consistency and high quality, the need for X-ray for Class 1 castings has disappeared. The U.S. Navy holds the same attitude when using forgings in nuclear and nuclear fields. For finished forgings, all requirements of ASME Code are ultrasonic inspection (U.T.), magnetic particle (M.T.) or liquid penetrant test (P.T.). Scrap forgings discovered by U.T., M.T. or P.T. methods are very rare. The delivery date of parts procurement can be controlled, so the delivery of valves is more reliable.

Directional structure of the valve body-in the environment with large temperature change, the creep fatigue strength is more than three times that of the casting.

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