Totally-closed multi-direction horizontal type die forging technology special for oil drill rod joint

Abstract

The invention discloses a totally-closed multi-direction horizontal type die forging technology special for an oil drill rod joint. The technology comprises the steps that (1) billets are placed into a lower die cavity; (2) a main position pressing machine carries out die assembly, reaches preset pressure, and maintains the pressure; (3) a left side position pressing machine and a right side position pressing machine extrude inwards at the same time to form a left side position inner hole and a right side position inner hole; (4) hydraulic systems of the main position pressing machine, the left side position pressing machine and the right side position pressing machine are communicated, the left side position pressing machine and the right side position pressing machine apply force at the same, and workpieces are extruded in all directions in a totally-closed mode; (5) the main position pressing machine is still in the pressure maintenance state, and the left side position pressing machine and the right side position pressing machine are reset at the same time; (6) the main position pressing machine is reset, and multi-direction forging forming is achieved. According to the totally-closed multi-direction horizontal type die forging technology special for the oil drill rod joint, whole oil drill rod joint structure forging can be achieved through one-heat forging, excess material trimming is not needed, ends are flat, metal full-fiber forging forming is achieved, the raw material utilization rate is improved, machining efficiency is improved, the rate of finished forged pieces is improved, and the general mechanical performance of products is improved.

Description

technical field [0001] The invention relates to a fully enclosed multi-directional horizontal die forging process for petroleum drill pipe joints. Background technique [0002] The oil drill pipe joint is a product that plays a connecting role in oil exploration tools. The traditional method of manufacturing oil drill pipe joints adopts the method of vertical extrusion molding. Due to the long length of this product, the general total length is about 450mm. The diameter of the hole is generally about 60mm. In order to meet the requirements of product forming and reverse extrusion, the length of the punch is generally 420mm in length and the diameter is about 55mm. The scrap rate of production is relatively high. In order to avoid waste products, the method of increasing the inner hole and outer diameter allowance of forgings is adopted to reduce the scrap rate. The result is that the utilization rate of materials is low and the processing allowance is large; on the other ha...

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Problems solved by technology

[0002] The oil drill pipe joint is a product that plays a connecting role in oil exploration tools. The traditional method of manufacturing oil drill pipe joints adopts the method of vertical extrusion molding. Due to the long length of this product, the general total length is about 450mm. The diameter of the hole is generally about 60mm. In order to meet the requirements of product forming and reverse extrusion, the length of the punch is generally 420mm in length and the diameter is about 55mm. Production scrap rate is relatively high

In order to avoid waste products, the method of increasing the inner hole and outer diameter allowance of forgings is adopted to reduce the scrap rate. The result is that the utilization rate of materials is low and the processing allowance is large; on the other hand, due to the inability to use closed extrusion The end faces of pressing and forgings are open metal flow, irregular geometric dimensions and cause unbalanced internal quality of joint products, affecting the overall mechanical properties of the product; there is also a large forging allowance, which causes a certain waste of subsequent machining

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