Hot-rolling perforation-cold-rolling forming method for hollow rock-drill steel
A technology of hot-rolled piercing and cold-rolled forming, which is applied in metal rolling and other directions, can solve the problems of low service life, out-of-round inner hole, and many processes, achieve accurate shape and size, ensure inner surface quality, and have a bright future in application broad effect
Inactive Publication Date: 2006-06-21
UNIV OF SCI & TECH BEIJING +1
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Problems solved by technology
The main disadvantages of this process are: many procedures, long process, out-of-round inner hole and large mandrel consumption (one mandrel can only roll one hollow drill steel)
The main disadvantage of this process is that due to the absence of the mandrel to process the surface of the inner hole and the severe torsion of the pipe during the cross-rolling extension process, cracks, wrinkles and other defects often appear on the surface of the inner hole, resulting in low service life and instability.
Method used
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example 1
[0056] Example 1: Rolling B28 and B32 pipes with a tube billet heating furnace, Φ50 two-roll piercer, and LD-30 three-roll cold rolling mill.
example 2
[0057] Example 2: Rolling D38 and B32 pipes with tube billet heating furnace, Φ50 two-roll piercer, and LD-30 three-roll cold rolling mill.
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Abstract
The invention provides a hot-rolled perforation-cold-rolled forming method of hollow drill steel. It is characterized in that: the hot-rolled piercing-cold-rolled forming method is used to produce B and D-type hollow drill steels, and the hot-rolled piercing Φ50 two-roll cross-rolling piercing machine rolls the round solid tube blank of Φ50~Φ65mm in a hot state. Φ50~Φ65mm, hollow capillary tube with wall thickness of 6~17mm, after cooling, it is rolled and formed on a cold rolling mill. The invention starts from the geometric characteristics of the hollow steel and realizes a specific deformation process through tool design. Compared with the existing production method, the main advantages of the present invention are: few working procedures, short flow process, good quality of inner hole, high precision of shape and size.
Description
technical field [0001] The invention belongs to the technical field of metal material processing, and in particular provides a hot-rolled piercing-cold-rolled forming method for hollow drill tool steel. Background technique [0002] Hollow drill steel is the main tool used for rock drilling and drilling in mining. Commonly used specifications are hexagonal B19~B45 (the number indicates the distance between opposite sides in mm) and circular D32~D51 (the number indicates the diameter in mm), and its cross section is as follows: figure 1 As shown, the water injection hole in the center is used for water, dust removal and cooling. [0003] The geometric characteristics of hollow drill steel are: wall thickness (the ratio of wall thickness to outer diameter S / D is 1 / 3.2~1 / 3.5), small inner hole (minimum is only 5.5mm), long length (up to 6mm ). In view of the above-mentioned geometric characteristics of "like (steel) pipe but not (steel) pipe", this product can neither comple...
Claims
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Patent Type & Authority Patents(China)
IPC IPC(8): B21B23/00
Inventor 陈恩义付晨光石兆镛朱景清
Owner UNIV OF SCI & TECH BEIJING
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