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Forming technology for forging seamless steel pipe with large diameter and extra thick wall under ultrahigh pressure

A technology of seamless steel pipe and forming process, applied in the direction of manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc. Volume reduction, elimination of unequal wall thicknesses, and reduction of gross-to-net ratio

Active Publication Date: 2011-09-07
TONGYU HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an ultra-high pressure forging large-diameter extra-thick-wall seamless steel pipe forming process to solve the problems of large inner hole allowance, large gross-to-net ratio, and high cost

Method used

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Embodiment Construction

[0015] Now the whole process of new molding technique of the present invention and forging forging is described as follows:

[0016] Step 1: Steel ingot pressing pliers handle, chamfering, chopping nozzle;

[0017] Step 2: Ingot drawing and cutting;

[0018] Step 3: blank upsetting;

[0019] Step 4: punching;

[0020] Step five: reaming;

[0021] Step 6: Use the mandrel and anvil with the same slope to pull the forging into a long tube with the same wall thickness and the same inner and outer taper;

[0022] Step 7: Withdraw the mandrel, and use the method of drawing without mandrel to pull the forging to size.

[0023] First of all, the same as the existing process, the steel ingot is clamped, chamfered, cut the nozzle, drawn and cut, and then punched with a punch, and the hole is expanded on the horse frame. Following technological process is key part of the present invention, now be described in detail as follows:

[0024] After reaming on the horse frame, with the co...

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Abstract

The invention provides a forming technology for forging a seamless steel pipe with large diameter and extra thick wall under ultrahigh pressure, belonging to the technical field of mechanical manufacture. The technology comprises 7 process steps of: step 1, pressing piler handle by an ingot, chamfering and cutting a nozzle; step 2, drawing the ingot and blanking; step3, upsetting blank; step 4, punching; step 5, reaming, as the same with the prior art; step 6, drawing a forging into a long barrel with equal wall thickness and consistent inner conicity and outer conicity by adopting a core rodand an anvil which have the consistent inclination; and step 7, quitting the core rod and drawing the forging to the drawing size by adopting a method of core rod free drawing. The invention eliminates waste caused by unequal wall thickness of a barrel part because of the conicity of the core rod in the traditional process, thereby reducing the process redundancy of an inner hole and the gross-to-net ratio and lowering the cost.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and relates to a manufacturing process of ultra-high-pressure forging large-diameter extra-thick-wall seamless steel pipes. Background technique [0002] At present, the traditional large-diameter extra-thick-wall seamless steel pipe forging process consists of the following process steps: [0003] Step 1: Steel ingot press pliers, chamfering, chopping nozzle; Step 2: Ingot lengthening, blanking; Step 3: Billet upsetting; Step 4: Punching; Step 5: Reaming; Step 6: Mandrel lengthening to size. [0004] Due to the need for elongation, the mandrel must have a certain taper, usually 1:100. Naturally, the inner hole of the forging has a corresponding taper, so that the machining allowance of the inner hole is larger, resulting in a larger net. resulting in high costs. Contents of the invention [0005] In order to overcome the deficiencies of the prior art, the present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J13/06B21J5/06B21K21/06
Inventor 司兴奎王世镇曹智勇司超新张仁军刘玉海
Owner TONGYU HEAVY IND
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