Perforation ejecting head and surface treatment method thereof

A perforated plug and surface treatment technology, applied in coating, metal rolling, metal material coating process, etc., can solve the problems of peeling, unsuitable thickness of oxide layer, poor plasticity, etc., to improve service life and enhance thermal insulation effect. , the effect of increasing the effective thickness

Active Publication Date: 2014-12-17
CHANGZHOU BAOLING HEAVY IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor plasticity and brittleness of the oxide, the oxide layer should not be thick, otherwise the oxide layer will not be firmly bonded to the substrate or even peel off. Generally, the thickness of the oxide layer on the surface of the plug is about 0.2-0.8mm (the maximum is not more than 1.0mm) ), and its structure is divided into inner and outer layers, and the thickness of the effective oxide layer that actually plays a protective role in use is only 1 / 2 of the total thickness of the oxide layer. Two to three high-alloy pipes made of super 13Cr and other materials are scrapped. For manufacturers, the cost of perforated plugs is actually too high

Method used

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  • Perforation ejecting head and surface treatment method thereof
  • Perforation ejecting head and surface treatment method thereof
  • Perforation ejecting head and surface treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The surface of the taper part and the end face of the head of the perforated plug processed in the normal shape are mechanically added to obtain several intervals of annular grooves. The width of the annular groove is b=0.5mm, the pitch t=1mm, and the depth h=1mm. In the heating furnace, the temperature is raised to 1000°C, and an oxidizing medium is introduced, and the temperature is kept for 7 hours for oxidation treatment, and then the temperature is lowered to 900°C, and slowly cooled to room temperature after being out of the furnace. The metallographic photos obtained under a microscope of 50 times the plug body after being baked are as follows: image 3 As shown, the oxide layer almost fills the annular groove. After testing, the thickness of the oxide layer on the surface of the substrate is 3.3 mm, which is more than three times the thickness of the existing oxide layer.

Embodiment 2

[0032] On the surface of the taper part of the perforated plug that has been processed in normal shape, several intervals of annular grooves are obtained by mechanically adding. The width of the annular groove is b=1.5mm, the pitch t=3mm, and the depth h=2mm. Put the plug into the heating furnace. Raise the temperature to 1050°C, pass through the oxidizing medium, keep it warm for 8 hours, carry out oxidation treatment, then cool down to 850°C, and slowly cool to room temperature after being out of the furnace. The metallographic photos obtained under a microscope of 50 times the plug body after being baked are as follows: Figure 4 As shown, after testing, the thickness of the oxide layer on the surface of the substrate is 3 mm, which is 3 times higher than the thickness of the existing oxide layer.

Embodiment 3

[0034]On the surface of the taper part of the perforated plug that has been processed in normal shape, several intervals of annular grooves are obtained by mechanically adding, the width of the annular groove b=2.5mm, the pitch t=3.5mm, the depth h=3mm, and the plug is placed in the heating furnace , heat up to 1100°C, pass through an oxidizing medium, keep warm for 10 hours, carry out oxidation treatment, then cool down to 800°C, and slowly cool to room temperature after being out of the furnace. The metallographic photos obtained under a microscope of 50 times the plug body after being baked are as follows: Figure 5 As shown, after testing, the thickness of the oxide layer on the surface of the substrate is 2.5mm, which is more than 2 times the thickness of the existing oxide layer.

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Abstract

The invention discloses a surface treatment method of a perforation ejecting head. The surface treatment method comprises the following steps: (1) spiral or annular matrixes integrated with an ejecting head main body are processed on the peripheral surface and the head end surface of the ejecting head main body; and spiral grooves or annular grooves are formed between the matrixes; and (2) the ejecting head main body obtained in the step (1) is put in a heating furnace for heating up to the temperature of 900-1100 DEG C; an oxidant is fed for keeping the temperature for 5-10 hours; then the temperature is reduced to 800-900 DEG C; the ejecting head main body is slowly cooled to the normal temperature after being discharged from the furnace; and oxide layers are continuously generated at the bottoms of the spiral grooves or the annular grooves, on the side wall surfaces of the grooves and on the surfaces of the matrixes. The surface treatment method of the perforation ejecting head increases the effective thickness of the oxide layers so as to prolong the service life of the ejecting head.

Description

technical field [0001] The invention relates to the field of seamless steel pipe production, in particular to a piercing plug and a surface treatment method for pipe blank piercing and capillary reaming. Background technique [0002] The perforated plug is subjected to complex rolling force, friction, and alternating heat and cold thermal stress during use. In order to effectively improve the service life of the plug, the best way at present is to form a layer of thermal insulation and lubrication on the surface of the plug through heat treatment. Oxidation layer, or a layer of protective layer with good high temperature strength and wear resistance, heat insulation and lubricating effect is coated on the surface of the plug through composite treatment technology. The quality of the protective layer has become a key factor in determining the life of the plug. [0003] At present, the general method is oxidation treatment: the surface is processed to the specified shape and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02B21B25/00B21B19/04
Inventor 朱建军全小兵陈明潘强诸长伟
Owner CHANGZHOU BAOLING HEAVY IND MACHINERY
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