Forging rough ingress processing is the process of forging production, the quality of forging blanks, productivity, will have an important impact on the quality of forgings, performance, life and economic benefits of enterprises. Forging rough processing process, equipment accuracy and performance determine the quality of the blank. The quality of forging blanks directly affects the precision of turning processing, and the quality of turning processing affects the precision and efficiency of grinding. Therefore, the choice of forging blanks in the whole forging process plays a very important role, forging rough selection principle, should meet the requirements of use under the premise, as far as possible to reduce production costs, so that products in the market competitiveness.
Next is the selection principle of forging blanks, with the following:
1. Principles of process: The use requirements of forgings determine the characteristics of the shape of the blanks, different use requirements and shape characteristics, forming the corresponding rough forming process requirements. The requirements for the use of forgings are reflected in the external quality of its shape, size, processing accuracy, surface roughness, and internal quality such as its chemical composition, metal tissue, mechanical properties, physical properties and chemical properties. For the use requirements of different forgings, consider the process characteristics of the forging material (e.g. forging performance, welding performance, etc.) to determine which roughforming method is used. While selecting the rough forming method, we should also take into account the metal forging process ability of subsequent machining.
Some of the roughs, which are complex in structure and difficult to form by a single forming method, should consider not only the possibility of combining various forming schemes, but also whether these combinations will affect the processing ability of machining.
2. Adaptability principles: In the selection of rough forming scheme, the principle of adaptability should also be considered. The suitable blank scheme is selected according to the structural shape, form factor and operating condition requirements of the forging. For example, for step shaft-type parts, when the diameter of the steps is not much different, the rod material can be used, if the difference is large, it is advisable to use forged blanks.
The working conditions of the forgings are different and the type of blank selected is different.
The principle of balancing conditions of production: The forming scheme of forging blanks should be selected according to the production conditions on site. On-site production conditions mainly include the actual process level of on-site rough manufacturing, equipment condition and the possibility and economy of foreign association, but also to consider the use of more advanced rough manufacturing methods due to production development. To this end, the choice of blanks, should analyze the existing production conditions of the enterprise, such as equipment capacity and staff technical level, as far as possible to use the existing production conditions to complete the rough manufacturing tasks.
If the existing production conditions are difficult to meet the requirements, consideration should be given to changing the forging material and/or roughforming method, which can also be resolved through external co-processing or outsourcing.
Principles of economics: The principle of economy is to make the forging material slower, can cost, wage spending and so on. In the selection of forging blank type and specific manufacturing methods, should meet the requirements of the use of parts, the premise of several pre-selection options for economic comparison, from which to choose the overall low production costs of the scheme. Generally, when selecting the type of blank and manufacturing method, the size and shape of the blank should be as close as possible to the finished part, so as to reduce the processing margin, improve the utilization rate of materials used in forging, reduce the mechanical processing workload. But the more accurate the blanks are, the more difficult it is to manufacture and the higher the cost. Therefore, when the production platform is large, the method of rough manufacturing with high precision and high productivity should be adopted, at which time the increased rough manufacturing costs can be compensated by reduced material consumption and machining costs, although a large investment is greater. The general law is that when producing a single piece of small batch, it can use the forming methods of free forging, manual arc welding, plate gold fitter, etc., and can use machine shape, forging, burying arc automatic welding or other.