Manufacturing method of steel tube provided with rack-shaped inner wall
A manufacturing method and technology of inner wall teeth, applied in the field of manufacturing inner wall rack-shaped steel pipes, can solve the problems of large amount of broaching, low efficiency, high cost, etc., and achieve the effects of reduced production cost, high dimensional accuracy, and good surface quality
Active Publication Date: 2013-06-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0069] Specific embodiments of the present invention will be described in detail below in conjunction with examples, but specific embodiments of the present invention are not limited to the following Example
[0070] The outer diameter of the steel pipe manufactured in this embodiment is Φ273 mm, the inner diameter is Φ237 (the diameter surrounded by the height of the addendum and the inner circle) mm, and the length is 6200 mm. The material is TP316L. Vertical axis section view see figure 2 .
[0071] This embodiment includes the following steps in sequence:
[0072] Ⅰ Raw material preparation
[0073] Two production methods of extrusion and perforation can be adopted for the blank pipe. Since the steel pipe produced by perforation has poor surface quality and small deformation, it is not conducive to subsequent processing. Therefore, the present invention adopts extrusion to produce blank pipe (large deformation, uniform structure, good surface quality), as follows...
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Abstract
The invention relates to a manufacturing method of a steel tube provided with a rack-shaped inner wall. The manufacturing method comprises the following steps: I, raw material preparation; II, heating conducted through an annular furnace; III, hole expanding: after hole expanding is completed, the diameter of the inner bore of a inner bore is 1.27+ / -0.3 times over the internal diameter of the en product of the steel tube provided with the rack-shaped inner wall; IV, induction heating: heat preservation is conducted while heating is conducted twice, and direct extrusion is conducted outside the furnace; V, extrusion: the diameter of an extrusion mould is 1.29+ / -0.5 times over the external diameter of the steel tube provided with the rack-shaped inner wall, the extrusion break-through force is not more than 48 MN, extrusion is conducted at the extrusion speed of 12.5-18% of 2600mm / s, and the extrusion ratio is 3.90+ / -0.5; VI, cold rolling preparation: cold rolling is conducted after heat treatment, straightening and acid-washing; and VII, cold rolling: the extension coefficient of rolling is 1.50+ / -0.3, a core bar is cone-shaped, the rolling speed is 25+ / -5 times / min, and the feeding quantity is not more than 4mm / time. According to the manufacturing method of the steel tube provided with the rack-shaped inner wall, manufacturing cost is low, and single steel tube is relatively long.
Description
technical field [0001] The invention relates to a method for manufacturing a rack-shaped steel pipe with an inner wall, specifically a method for manufacturing a rack-shaped steel pipe with an inner wall whose outer diameter is not less than 150mm. Background technique [0002] The new manufacturing method of the existing production inner wall rack-shaped steel pipe is mainly casting, and secondly there are methods such as drawing and broaching. But all have respective defectives. [0003] The conventional casting production process is as follows: after casting, sawing to length and cutting into short joints less than 1 meter (too long is not convenient for grinding and forming), and the inner and outer surfaces are manually ground and machined to form. The defect of this method is that the length of the steel pipe is short , The length is less than 900mm, the amount of grinding is large, there are many welds, the efficiency is low, and the cost is high. At the same time, t...
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IPC IPC(8): B21C37/06
Inventor 马林涛康喜唐孙涛王伯文侯楠张丙静聂飞梁祥祥
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD