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Preparation method of top head for round steel hot piercing

A technology for thermal perforation and round steel, which is applied in the field of preparation of plugs for thermal perforation of round steel, which can solve problems such as poor precision, cumbersome finishing, and large machining allowance on the outer surface, and achieve the effect of improving precision and service life

Inactive Publication Date: 2012-10-03
常熟市旋力轴承钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As far as the applicant knows, before this application was filed, plugs for round steel hot piercing were generally obtained by pressing with a belt hammer combined with a mold. The hollow part, that is, the eccentricity of the inner cavity as mentioned in the aforementioned CN10246326A is relatively large, so cumbersome finishing is required to ensure that the eccentricity of the hollow part is controlled; the precision of forging with a belt hammer is poor, and the outer surface has a large machining allowance. Not only does it result in high material consumption during surface processing, but also high labor (work) intensity during finishing processing, and the qualified rate of finished products is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking the preparation of a plug for hot piercing of round steel for piercing Φ61×4.5mm (diameter 61mm and wall thickness 4.5mm) as an example, the following steps are included:

[0022] A) Blanking: Blanking a bar material of 4Cr5MoSiV1 and a diameter of Φ60mm (blanking can also be called breaking), the length of the blanking is 50mm, and a 50mm long rod section is obtained, and it is in the center of one end of the bar section Process a diameter of 6mm and a depth of 9mm to obtain a blank;

[0023] B) Rough forging: Send the blank obtained in step A) into the heating furnace and heat it to 1050°C. After being released from the furnace, perform preliminary forging according to the size requirements of the drawings or the requirements of the process regulations until the blank is formed into a top prototype, and the outer diameter is required to be 51. ~ 53mm, the diameter of the inner hole as the hollow part is 25-26mm, the eccentricity of the inner hole is ≤2%, ...

Embodiment 2

[0028] Only change the depth and diameter of the centering hole in step A) to 7mm and 11mm respectively; change the heating temperature in step B) to 1100°C; change the holding temperature in step C) to 870°C, and change the Change the furnace cooling temperature to 500°C; change the heating temperature and time in step D) to 650°C and 115 minutes respectively; in step E), first raise the temperature to 710°C and keep it for 15 minutes, then raise the temperature to 790°C and keep it 35min, then the temperature was raised to 950°C and kept for 10min, and the rest were the same as those described in Example 1.

Embodiment 3

[0030] Only change the depth and diameter of the centering hole in step A) to 8mm and 13mm respectively; change the heating temperature in step B) to 1075°C; change the holding temperature in step C) to 860°C, and change the Change the furnace cooling temperature to 485°C; change the heating temperature and time in step D) to 625°C and 120 minutes respectively; in step E), first raise the temperature to 690°C and keep it for 25 minutes, then raise the temperature to 810°C and keep it 25min, then the temperature was raised to 1050°C and kept for 8min, and the rest were the same as the description of Example 1.

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PUM

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Abstract

The invention relates to a preparation method of a top head for round steel hot piercing, belonging to the technical field of preparation of parts for metal pipe fitting piercing. The preparation method comprises the following steps of: blanking to obtain a rod section, and processing a centering hole in the center of one end of the rod section to obtain a blank; placing the blank into a heating furnace for heating, taking the blank out of the heating furnace and then carrying out initial forging till the blank is formed into a tip embryonic form; carrying out die forging on a rough forging blank with the tip embryonic form; controlling the machining allowance of a tip and the eccentricity ratio of a cavity as a hollow part; immediately placing into a sandbox for heat preservation after the die forging is finished; cooling with the heating furnace, and then blowing for air cooling to obtain a precision forging blank; placing the precision forging blank into the heating furnace for heating, controlling heating temperature and heating time, and cooling to obtain a rough blank; and carrying out finish machining, overlaying welding and quenching. The invention has the advantages that the rigidity achieves 40-50, the accuracy of a tip surface is enhanced, the machining allowance of the tip surface is reduced to 1-2 mm, the eccentricity ratio of a hollow part is controlled, subsequent metal machining is unnecessary to carry out except in a screw thread area, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of parts preparation for perforating metal pipe fittings, and in particular relates to a method for preparing a plug for hot perforating round steel. Background technique [0002] The aforesaid plug for hot piercing of round steel is one of the most consumed and also one of the key tools in the production of hot-rolled pipe fittings such as seamless steel pipes and the like. The technical information about the plug can be found in Chinese patent documents, such as Invention Patent Application Publication No. CN102463261A recommends "a perforated plug", which specifically discloses the structure of the perforated plug: including a base, an inner cavity formed inside the base, and a plug (cobalt-based alloy, molybdenum-based alloy or nickel-based alloy); publication number CN101942610A provides "a hot-rolled seamless steel pipe piercing plug and its processing technology", which specifically discloses the chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 顾铭顾晓华陈雅龙李光洲汪明
Owner 常熟市旋力轴承钢管有限公司
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