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What are the blanking methods before forging shaft forgings?

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What are the blanking methods before forging shaft forgings?

Release date:2019-02-16 Author: Click:

What are the blanking methods before forging shaft forgings?

Today xiaobian take you to understand the forging forging before several methods. Before heating and forging, raw materials shall be cut into reasonable length, which is called blanking. The billet is usually opened by free forging, and then the raw material (ingot, billet) is cut off by double forging, and the billet is cut off for heating according to a certain size. The common blanking methods include cutting, cold folding, sawing, turning, grinding wheel cutting, chopping, etc. All kinds of blanking methods have their own characteristics, according to the nature of the material, size, batch and quality requirements of the blanking. Their blank quality, material utilization and processing efficiency are different. Therefore, the blanking method suitable for forging products should be selected according to the above conditions.

There are mainly saw cutting cutting method, cutting cutting method, grinding wheel cutting method, electric spark cutting, broken hair (also known as cold folding method). Other blanking methods include friction sawing, electromechanical sawing, anodic mechanical cutting, electric spark cutting and precision blanking.

Sawing and cutting

Raw materials shall be cut before production and processing. Sawing can cut large cross-section of billet, although the productivity is low, the sawing loss is large, because only accurate cutting, cut level, especially used in precision forging process, is a main cutting method. The commonly used sawing machines are disc, band saw and bow saw.

Shearing blanking is characterized by high production efficiency, simple operation, no metal loss at the fracture, simple tools, low mold costs and other advantages. But the end quality punch blanking and cutting method blanking poor. Suitable for mass production, widely used. In the shear process, the upper and lower blades are used to apply a certain pressure (F) to the billet to produce bending and tensile deformation within the billet, and fracture occurs when the stress exceeds the shear strength of the forging raw materials.

Wheel cutting method

It is suitable for cutting special-shaped cross-section materials of small cross-section bars and tubes, as well as metals difficult to be cut by other blanking methods, such as high-temperature alloys GH33 and GH37, etc. The advantages are simple equipment, convenient operation, accurate cutting length, good quality of end face, higher productivity than the saw blade small material and lower than the shear cold cutting, bearing grinding wheel piece consumption, and fragile, loud noise.

edm

Its working principle is: dc motor through the resistance R and capacitance C, so that the blank connected to the positive electrode saw blade connected to the negative electrode, cutting in the electrolyte, the production of electric spark pulse current intensity is very large, up to hundreds or thousands of amperes; The pulse power reaches tens of thousands of watts. The contact area at the cut is small, so the current density can be as high as hundreds of thousands of A/mm2. Therefore, the blank on the local temperature is very high, which is about 10000 ° C, prompting blanking metal melting.

Broken hair

The original work was to make a small gap in the place to be broken. Under the pressure of F, stress concentration was generated at the break to make the blank break. The reason is that when the average stress in the blank reaches the yield limit, the local stress at the gap has already exceeded the strength limit, so the blank has already broken before it has time to shape and deform.


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