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Lifting ring forging design procedure and heating purpose

- Mar 16, 2018 -

The general design procedure of the lifting ring forging mainly includes the drawing of the cold forging drawing according to the product part drawing; in the second step, it is necessary to pay attention to the calculation of the forging volume (adding the nominal size of the forging (One-half of positive deviation) and weight; when lifting ring is forged, it should also pay attention to designing the forging step and calculate its volume.

 

The next step in the design of the lifting ring for forging, this time is to pay attention to determine its billet diameter, upsetting length and upsetting ratio and billet length; design and calculation of step diagram (all dimensions are according to the thermal size) Calculate the forging pressure and die size of the forging when the lifting ring is forged. After that, it is necessary to pay attention to the upsetting length, and finally determine the equipment specifications.

 

When lifting the ring forging, the design of the mold must also pay attention to the overall design of the size of the equipment's mold space. Afterwards, the punch holder, the concave mold body and the concave mold insert, and the punch mold should be determined. The shape and size of the punch shank, etc. In the next step, it is also necessary to pay attention to designing the model according to the work step diagram.

 

When the lifting ring is forged, the purpose and requirement of the heating of the forgings must be to increase the plasticity of the metal itself, and it must be followed by reducing the metal deformation resistance to make it easier to form. Obtain better forging microstructure and mechanical properties. The requirement of the forging when it is heated means that under the condition of the allowable thermal conductivity and internal stress of the metal material, it will heat up to a predetermined temperature at a fast speed, increase the efficiency, and save energy.

 

When the lifting ring is forged and heated, the heating metal should be reduced as much as possible to absorb harmful gases, and more common ones include gases such as oxygen, hydrogen, and nitrogen to reduce defects such as oxidation, decarburization, or hydrogen embrittlement, and improve heating quality. The lifting ring forging is in the low-temperature heating stage. It is necessary to prevent excessive temperature difference between the outer layer and the core of the metal section due to improper heating.

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