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What is the process of machining non-standard parts? How is it inspected?

　　Drawing is a process of fixing whiskers during the forging process of large shaft-shaped forgings, and it is also an important process that affects the quality of forgings. After drawing, the cross-sectional area of the billet is reduced, the length is increased, and it also plays a role in breaking down coarse crystals, forging internal pores and holes, and refining the as-cast structure. Thus, a uniform and dense forging is obtained.

　　In the processing of forgings, people have gradually begun to realize the importance of the internal stress-strain state of large forgings to internal forging defects. From the general upper and lower flat anvil drawing to upper flat anvil drawing, lower V anvil drawing and upper and lower anvil drawing, and then by changing the anvil shape and process conditions, WHF forging, KD forging, FM forging, JTS forging, FML forging, TER forging and SUF forging were proposed.

　　So what tests need to be done after the processing of forgings is completed? In order for forgings to have better performance, we need to conduct the following tests:

　　1. Hardness and hardenability test of forgings. Because it cannot be ruled out that the core part of the part will have low hardness. Generally, if the hardenability of the material is good, the hardness of the bolt section can be uniformly distributed. As long as the hardness is appropriate, the strength and guarantee force can also meet the requirements, but due to poor hardenability, although the strength is sometimes under the condition that the hardness is appropriate.

　　2. Angle method inspection method: Check whether the fixture angle between the initial tightening starting line and the termination line drawn by the relative position of the nut after initial tightening can reach the specified value. Draw a line on the relative positions of the bolt end and the nut, and then loosen all the nuts. Tighten the bolts again according to the specified initial tightening torque and final tightening angle, and observe whether they coincide with the original drawn line. If the twisting angle is offset. The difference is within 10 degrees.

　　3. When decarburization and carburization occur in the furnace, in order to timely judge the carbon control condition in the furnace, spark inspection and Rockwell hardness can be used for inspection. Spark inspection is to judge the quenched parts by gently grinding out sparks on the grinding machine. The Rockwell hardness test is performed on one side.

　　4. Torque method check: The method is to draw an upper line at the relative position of the bolt tail end and the nut, then retract the nut by 60 degrees, and then use a torque wrench to measure the torque value between the two. The error should be within 10 degrees.

　　5. With the increase of the strength of irregular parts, the hydrogen embrittlement sensitivity and hydrogen embrittlement performance will also increase. Dehydrogenation treatment is usually carried out in an oven or oven. At high temperatures, hydrogen diffusion can be used. Using the tightening method, tighten the special fixture until the screw bears considerable tension, and then loosen the threaded fastener after it does not break.

　　We are a manufacturer of forgings, with many years of experience in this industry. If you want to learn more about this, please contact us. We can introduce it to you from different aspects. Let you have a more detailed understanding.

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