Column nail type high-pressure grinding roller roll surface and production method thereof

Abstract

The invention discloses a production method of a column nail type high-pressure grinding roller roll surface. The production method comprises the following steps that molten steel refining, external refining, modification or spheroidizing are conducted on a working layer material and a core layer material; centrifugal pressure casting is conducted on a roller shell; then rough machining, annealing, quenching, tempering and finish machining are conducted on a roller shell workblank; blind holes are machined in the excircle surface of the roller shell blank; the textures of column nails at a first area in the middle of the roll surface are determined, and the hardness of the textures of the column nails at areas which are symmetrically distributed on the two sides of the first area is sequentially reduced by HRA 0.5-HRA 2; and the column nails at all the areas are installed into the blind holes of all the areas of the roll surface in transition fit and adhesive bonding modes. The production method has the advantages that treatment of a roller shell thermotechnical stage is completed at a time, a heat treatment link after machining is omitted, matching of column nail abrasive resistance is conducted through a roller shell abrasive resistance test, the textures of the column nails at all the areas are selected, and even abrasion of the roll surface is achieved; and the column nailsare installed by adopting the transition fit and adhesive bonding modes, and therefore installation and replacement of the column nails are convenient.

Description

technical field [0001] The invention relates to a stud-type high-pressure roller mill roll surface and a production method thereof, in particular to a roller press (high-pressure roller mill) surface and a production method for medium and fine crushing of materials in mineral processing, which can be used in metallurgy The crushing and grinding of materials in mining, building materials, cement, coal, chemical and other industries belongs to the field of mineral processing. Background technique [0002] Due to the high-yield and energy-saving characteristics of roller presses (high-pressure roller mills), they have been widely used in metallurgical mines, building materials, cement, coal, and chemical industries. Usually, roller presses (high-pressure roller mills) are used to crush and grind minerals. . The key component of the roller press (high-pressure roller mill) is the roller that directly interacts with the material. Due to the strong abrasiveness of minerals, most ...

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Problems solved by technology

The most obvious disadvantages of this method: First, the entire roller sleeve base material is one material, and the inner and outer hardness of the roller sleeve is consistent, which is prone to bursting during use. Both the inner and outer layers are high-alloy materials, and the cost is high; Heat treatment after hole processing will produce a layer of oxide scale in the hole. Since there are tens of thousands of blind holes processed on the roller surface, it is very difficult to remove these oxide scales; Nails, the roller surface cannot be worn evenly, and the middle part will be worn off and the edge part will be scrapped if the wear is less, resulting in waste

The most obvious disadvantages of this method are as follows: firstly, the use of studs of one material on the roller surface cannot achieve uniform wear on the roller surface, and the middle part will be worn off and the edge will be scrapped if there is less wear, resulting in waste; The studs are made of ceramic materials (metal ceramics, alumina ceramics, zirconia ceramics), which are not suitable for the working conditions of high-pressure roller mills. The working conditions of the roller surface of high-pressure roller mills are abrasive wear under high stress. The strength and deflection are much worse than those of cemented carbide, almost less than half. The cemented carbide studs sometimes break when they are used, and the ceramic studs are even more severely broken; the third is that the ceramic studs are broken. It cannot be replaced, because there is no external force, the broken ceramic stud in the hole will not automatically come out even after the adhesive fails, and the ceramic material cannot be welded, so it is impossible to weld an extension rod to pull out the broken stud; Fourth, the production time Long, because the studs are made of non-metallic materials, they are connected to the holes by adhesives, and they have to be placed for 24-48 hours. The rollers are round, and they are placed in each direction for such a long time, so the time for installing the studs will be very long

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