所属分类：常见问题 发布时间：2021-04-01 18:33:59 来源：http://www.lcnmb500.com 浏览量：
When Hardox400 wear-resistant plate is cold-rolled in the coarse extrusion stand, it is necessary to rotate the Hardox400 wear-resistant steel casting several times. Therefore, all four sides of the steel casting are processed, and the air oxidation which originally adhered to or produced again falls off the surface of the steel casting. In order to improve the rolling in standard, there are bumps or grooves on the surface of cold rolling. The marks caused by bumps and grooves on the rolled metal material can be flattened again after cold rolling between bright rolling wheels.
The Hardox400 wear-resistant plate is first arranged in the lower plate hole in the middle of the lower roller and the upper roller according to the layout, and then returned to the upper plate according to the porosity (upper plate hole) in the middle of the middle roller and the upper roller. Therefore, the load of the middle roll is larger than that of the other two rolls.
Proper hole design, i.e. proper specification of porosity between hot rolled strips, is one of the key preconditions for successful cold rolling. -Generally according to the strength of rolled metal material to carry out plate hole design. For forged mild steel, it is common to calculate the average reduction rate of 25%. The working pressure of cold rolling at 1300 ° should be half less than that at 1200 ℃. In the blooming mill, the finishing temperature is about 900 ℃. Therefore, in order to ensure the same reduction, the cold rolling working pressure at 900 ° should be 3 to 4 times higher than that at 1300 ° because the deformation of metal composites has been greatly increased at that low temperature.
In other words, in order to achieve the desired thickness and porosity, the size of the rolled strip can be adjusted, and the hot rolled strip can be separated from each other one by one. The thickness of the thick steel plate lies in the thickness of the thin billet. Therefore, the installation of the hot rolled strip in the extruder has great practical significance. If the thickness of the billet exceeds the allowable level, the required thickness of the heavy plate can not be maintained, because the cold rolling of wear-resistant steel is often considered according to the length of the rolled product.
In front of the sound card frame, there is a mechanical equipment from the thin billet rolling.
There are three scrapers in this kind of machinery and equipment, two of which are installed under the rolled piece and one on the top. Install the K-shaped longitudinal scraper pneumatically and clamp the scraper tightly to the rolled metal material. Under the effect of three scrapers, in order to strengthen the whole process, it provides 45-50 atmospheric pressure water. Steam can also be used instead of water.
When the rolled piece leaves the grinding and polishing frame, it goes to the cutting machine equipped with partition plate, and on the cutting machine, the rolled piece is cut into a certain length of hada wear-resistant steel. Each work in the process of thin billet processing is carried out successively.