technical field Ring of Forging
The invention relates to the field of forging technology, in particular to a forging process for forging rings.
Background technology
Forging is a method of forming blanks or parts with certain shape, size and properties by applying external force to metal to produce plastic deformation, changing the shape and size of blanks, and improving its internal structure and mechanical properties. Forging and stamping, referred to as forging, is a part of the production method of metal pressure processing.
Traditional forging process of large forging ring: forging one punching one expanding ring, one billet one ring, forging efficiency is low, temperature drop is fast, temperature is not easy to guarantee; forging ring deformation is small, especially the axial deformation is small, the tangential, radial and axial three-dimensional performance of large forging ring is very different. Compared with ASTM B247, the margin is very small, especially the axial performance is far lower than the tangential performance.
I) The ingot is heated and the metal content of the ingot billet is not less than that of the two forging rings.
2) Forging, the heated ingot billet is processed by pier thickness and chamfering several times, and then the ingot billet is punched out of the central hole.
3) Ring enlargement, through the ring enlargement tool, the center hole of the above-mentioned ingot billet is enlarged until the thickness and diameter of the center hole of the ring ingot billet meet the requirements;
4) One billet is made into two rings, and the expanded billet is cut into two forging rings.
Preferably, in the forging process of the forging ring, between the steps 2) and 3, there is also a step 23) to process the center hole, which is machined by the hole processing machine to process the ingot billet into a ring.
Optimized, in the forging process of the forging ring mentioned above, the step 3 is to expand the ring first with a smaller diameter mandrel, and then with a larger diameter mandrel.
Preferably, in the forging process of the forging ring, the ring expanding tool comprises a rack, a mandrel and an anvil of the upper die. The mandrel has first resistance teeth along its axis. The first resistance teeth are multiple, and a first resistance groove is formed between two first resistance teeth, and the first resistance teeth are distributed along the circumference direction of the mandrel.
Preferably, in the forging process of the forging ring, the first resistance teeth are uniformly distributed along the circumference direction of the mandrel, and the first resistance teeth are gear teeth.
Preferably, in the forging process of the forging ring, the flat anvil of the upper die is provided with a plurality of second resistance teeth at the contact point between the center of the flat anvil and the forging ring, and a second resistance groove is formed between the two adjacent second resistance teeth.
Preferably, in the forging process of the forging ring, the plurality of the second resistance teeth are parallel to each other, and the second resistance teeth are gear teeth.
From the above technical scheme, it can be seen that the invention increases the deformation of the forging ring by making the metal quantity of the ingot billet less than two forging rings, especially increasing the axial deformation, reducing the loss of the axial performance in the shaping process, and slows down the temperature drop by increasing the volume of the ingot billet, reducing the feeding quantity, reducing the cost by about 20%, and increasing the forging speed. It is more than three times higher, improving metal flow and optimizing process, so as to significantly improve the three-dimensional performance, especially the axial performance of large forged rings. The axial performance of forged rings is 40-80% higher than that of national military standard or American standard ASTM B247, and is close to the tangential performance.
