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Drill pipe joint precision die forging process

A technology for oil drill pipe joints and precision die forging, which is applied in the direction of manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc. It can solve the problems of poor concentricity of the center hole, large machining allowance, and low production efficiency. Achieve the effect of reducing the length-to-diameter ratio, improving the surface quality of forgings, and improving production efficiency

Inactive Publication Date: 2008-05-21
JIANGYIN LONGCHENG DRILLING & PRODN MACHINERY MFG
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing production of oil drill pipe joints such as large machining allowance, poor concentricity of the center hole, short life of the punch and low production efficiency, the invention provides a precision die forging process for oil drill pipe joints

Method used

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Embodiment Construction

[0018] Fig. 1, Fig. 2 and Fig. 3 of the present invention are schematic diagrams of joint die forging process and die structure. First, design the joint die forging drawing according to the joint part drawing proposed by the user, and calculate the blank size (diameter and length) according to the forging drawing. Then, according to the design rule and calculation method of the present invention, the continuous skin position of the joint die forging is determined, and the shape and size of the preform are optimized. Then, according to the calculation method of joint die forging force energy process parameters provided by the present invention, the upsetting extrusion force in the billet making process, the extrusion force and die tension in the forming process, and the punching force in the punching process are determined. Then the joint die forging forming process and its corresponding molds can be designed - billet mold, forming mold and punching mold.

[0019] The design o...

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Abstract

The invention discloses a precise die forging technique of a petroleum drill rod connector and is characterized in that: 1) flan material is prepared with a band saw; 2) the flan material is heated quickly at a temperature that is suitable for forging by a medium frequency electric induction furnace; 3) then the flan material is extruded in a close type into a prefabricated flan and a flan makes concave die on a quick flan-making oil hydraulic machine; 4) a molding concave by die level method extrudes and presses the prefabricate flan into a connector die forging piece on the quick flan-making oil hydraulic machine which can implement combination of the upper molding concave die and the lower molding concave die and relative extrusion and pressing from right and left and inner holes of the connector die forging piece is provided with wad; 5) finally a hole punching die punches away the recess inside the inner hole of the forging piece on a special hole punching oil hydraulic machine to obtain the connector forging piece with accurate specifications, excellent structure performance and central through holes. The invention has the advantages of good streamline distribution, material conservation, environmental protection and high production efficiency.

Description

technical field [0001] The invention relates to a precision die forging process for oil drill pipe joints, belonging to the technical field of metal plastic forming. technical background [0002] The joint is an important part used to connect the upper and lower drill pipes in oil drilling, and bears heavy torque during use. For this reason, the joints have extremely strict requirements on materials, structures and mechanical properties, and must be made of forgings. In the past, when the demand for joints in the market was not large, the general joints were processed by free forging. Since the free forging is a solid part, the center hole needs to be machined, and the machining allowance is large, so the material loss is very large and the production efficiency is very low. With the rapid development of oil drilling industry at home and abroad, the market demand for joints continues to expand. In order to improve the economic benefits of joint production, joint manufactur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J5/02B21J1/04B21J13/02B21J1/06
Inventor 高新李永洪
Owner JIANGYIN LONGCHENG DRILLING & PRODN MACHINERY MFG
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