阅读说明：本技术 辊压机用复合柱钉 (Composite stud for roller press ) 是由 熊焰来 徐从战 高霖 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种辊压机用复合柱钉,包括有伸出到辊面外的高硬度碳化物头部和位于压辊内且部分嵌入到压辊柱钉孔内的高韧性碳化物底部,高韧性碳化物底部的顶端为山丘状凸起结构、高硬度碳化物头部的底端为与山丘状凸起配合连接的凹槽结构或高硬度碳化物头部的底端为山丘状凸起结构、高韧性碳化物底部的顶端为与山丘状凸起配合连接的凹槽结构,山丘状凸起伸入到凹槽内且高韧性碳化物底部的顶端面和高硬度碳化物头部的底端面紧密接触连接。本发明复合柱钉其头部采用高硬度硬质合金满足耐磨性要求,底部采用韧性较高的硬质合金,消减集中应力,同时也降低成本。(the invention discloses a composite stud for a roller press, which comprises a high-hardness carbide head part extending out of a roller surface and a high-toughness carbide bottom part positioned in a press roller and partially embedded into a stud hole of the press roller, wherein the top end of the high-toughness carbide bottom part is of a hill-shaped protruding structure, the bottom end of the high-hardness carbide head part is of a groove structure matched and connected with the hill-shaped protruding structure, or the bottom end of the high-hardness carbide head part is of a hill-shaped protruding structure, the top end of the high-toughness carbide bottom part is of a groove structure matched and connected with the hill-shaped protruding structure, the hill-shaped protruding structure extends into the groove, and the top end surface of the high-toughness carbide bottom part is tightly contacted and connected with the bottom end surface of the high-. The head of the composite stud meets the requirement of wear resistance by adopting high-hardness hard alloy, and the bottom of the composite stud adopts high-toughness hard alloy, so that concentrated stress is reduced, and meanwhile, the cost is reduced.)

1. the roll squeezer is with compound stud, its characterized in that: the high-hardness carbide roller comprises a high-hardness carbide head extending out of a roller surface and a high-toughness carbide bottom which is positioned in the roller and partially embedded into a pin hole of the roller, wherein the top end of the bottom of the high-toughness carbide is of a hill-shaped convex structure, the bottom end of the high-hardness carbide head is of a groove structure matched and connected with the hill-shaped convex structure, or the bottom end of the high-hardness carbide head is of a hill-shaped convex structure, the top end of the bottom of the high-toughness carbide is of a groove structure matched and connected with the hill-shaped convex structure, the hill-shaped convex structure extends into the groove, and the top end surface of the bottom of the high-toughness carbide is in close contact connection with the bottom end surface of the high.

2. The composite stud for roller presses of claim 1, wherein: the axial height between the top end and the bottom end of the hill-shaped bulge is not less than 1/4 of the diameter of the composite stud.

3. the composite stud for roller presses of claim 1, wherein: the high-hardness carbide head is a high-hardness cobalt-cemented tungsten carbide-based alloy head, a high-hardness nickel-cemented tungsten carbide-based alloy head, a high-hardness cobalt-cemented titanium carbide-based alloy head, a high-hardness nickel-cemented titanium carbide-based alloy head, a high-hardness tungsten-titanium-cobalt alloy head or a high-hardness tungsten-titanium-nickel alloy head.

4. The composite stud for roller presses of claim 1, wherein: the bottom of the high-toughness carbide is the bottom of the high-toughness iron-bonded titanium carbide-based alloy.

5. The composite stud for roller presses of claim 1, wherein: the volume ratio of the high-hardness carbide head to the high-toughness carbide bottom is 0.5-2: 1.

6. The composite stud for roller presses of claim 1, wherein: and a mixed transition region is formed between the head part of the high-hardness carbide and the bottom part of the high-toughness carbide, and the thickness of the mixed transition region is not less than 0.1 mm.

Technical Field

The invention relates to the field of roller presses in rolling and grinding equipment, in particular to a composite stud for a roller press.

Background

Roller presses, also known as high pressure roller mills. Due to the characteristics of high efficiency and energy saving, the system is widely applied in cement industry and other industries since 2000 years, compared with a pure ball mill grinding system, the system can increase the yield by 50-200%, save 20-40% of electricity, save energy and reduce the power consumption for cement production. In the field of metal mineral processing, compared with the traditional grinding system, the grinding system adopting the high-pressure roller mill can realize tail discarding in advance, the yield increasing amplitude reaches 40-70%, and the unit power consumption is reduced by 20-35%. And the high-pressure roller mill has the advantages of improving the grindability of ores, improving the metal leaching rate, improving the mineral dissociation rate and the flotation recovery rate, and meets the national requirements on energy conservation and emission reduction, thereby realizing sustainable development.

The roll surface of the high-pressure roller mill belongs to an easily-worn part, and in recent years, various manufacturers are constantly striving to improve the wear resistance of the roll surface so as to achieve the purpose of prolonging the service life. The roller surface of the stud is made of common steel, counter bores are drilled on the roller surface according to a certain rule, and hard studs with excellent wear resistance are embedded in the counter bores, wherein the head of each stud is 2-5mm higher than the roller surface. The during operation mainly bears the highest extrusion force by the stud of high strength and material extrusion contact, and the gap between the stud is the roll surface of ordinary steel material, and the pressure that not only bears is less than the stud far away, makes the surface cover a layer of material lining because its sunk structure simultaneously, has realized the protection to the roll surface. Therefore, the application of the stud roll surface greatly prolongs the service life of the roll surface.

An important problem of stud roll surfaces is how to reasonably blend the very hard stud with the roll surface of ordinary steel. In order to obtain higher wear resistance, the stud is usually made of carbide, and has the characteristics of high hardness and good wear resistance, but has poor toughness, and because the stud is embedded inside the stud hole which is made of common steel, the stress concentration inside the stud hole is easy to cause the phenomena of bulging, peeling and the like. On the other hand, only the head of the stud contacts with the material to perform the function of the press roll, the part of the stud located in the press roll does not play a wear-resisting role, and the hard alloy with high price is adopted to cause material waste.

Disclosure of Invention

The invention aims to solve the technical problem of providing a composite stud for a roller press, wherein the head of the stud meets the requirement of wear resistance by adopting high-hardness hard alloy, the bottom of the stud adopts high-toughness hard alloy, the concentrated stress is reduced, and the cost is reduced.

The technical scheme of the invention is as follows:

The composite stud for the rolling press comprises a high-hardness carbide head extending out of a rolling surface and a high-toughness carbide bottom which is positioned in the rolling press and partially embedded in a stud hole of the rolling press, wherein the top end of the bottom of the high-toughness carbide is of a hill-shaped protruding structure, the bottom end of the head of the high-hardness carbide is of a groove structure matched and connected with the hill-shaped protruding structure, or the bottom end of the head of the high-hardness carbide is of the hill-shaped protruding structure, the top end of the bottom of the high-toughness carbide is of a groove structure matched and connected with the hill-shaped protruding structure, the hill-shaped protruding extends into the groove, and the top end surface of the bottom of the high-toughness carbide is in close contact with the bottom end surface of the head of the.

The axial height between the top end and the bottom end of the hill-shaped bulge is not less than 1/4 of the diameter of the composite stud.

The high-hardness carbide head is a high-hardness cobalt-cemented tungsten carbide-based alloy head, a high-hardness nickel-cemented tungsten carbide-based alloy head, a high-hardness cobalt-cemented titanium carbide-based alloy head, a high-hardness nickel-cemented titanium carbide-based alloy head, a high-hardness tungsten-titanium-cobalt alloy head or a high-hardness tungsten-titanium-nickel alloy head.

The bottom of the high-toughness carbide is the bottom of the high-toughness iron-bonded titanium carbide-based alloy.

The volume ratio of the high-hardness carbide head to the high-toughness carbide bottom is 0.5-2: 1.

And a mixed transition region is formed between the head part of the high-hardness carbide and the bottom part of the high-toughness carbide, and the thickness of the mixed transition region is not less than 0.1 mm.

The invention has the advantages that:

(1) The head of the composite stud of the invention adopts high-hardness hard alloy, thereby meeting the requirement of the wear resistance of the stud, the bottom of the composite stud adopts high-toughness hard alloy, the high-toughness hard alloy is better fused with the stud hole of the compression roller, the concentrated stress is reduced, and the cost is reduced;

(2) the head and the bottom of the stud are fully fused to form a mixed transition area, the thickness of the mixed transition area is not less than 0.1mm, the material separation phenomenon cannot occur, and the transverse breaking strength of the stud is improved;

(3) The top end of the bottom of the high-toughness carbide and the bottom end of the head of the high-hardness carbide adopt a hill-shaped convex contact connection structure, and the axial height between the top end and the bottom end of the hill-shaped convex is not less than 1/4 of the diameter of the composite stud, so that the bending strength of the stud is improved, and the stud is not easy to break.

drawings

Fig. 1 is a first schematic structural diagram of the present invention.

FIG. 2 is a second schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, the composite stud for the roll squeezer comprises a high-hardness carbide head 1 extending out of a roll surface and a high-toughness carbide bottom 2 positioned in a press roll and partially embedded in a stud hole of the press roll, wherein the top end of the bottom of the high-hardness carbide 2 is of a hill-shaped convex structure, the bottom end of the high-hardness carbide head 1 is of a groove structure (shown in fig. 1) matched and connected with the hill-shaped convex structure, or the bottom end of the high-hardness carbide head 1 is of a hill-shaped convex structure, the top end of the high-toughness carbide bottom 2 is of a groove structure (see fig. 2) connected with the hill-shaped protrusion in a matched mode, the hill-shaped protrusion extends into the groove, the top end face of the high-toughness carbide bottom 2 is in close contact with the bottom end face of the high-hardness carbide head 1 to be connected, a mixed transition area is formed between the high-hardness carbide head 1 and the high-toughness carbide bottom 2, and the thickness of the mixed transition area is not smaller than 0.1 mm.

The volume ratio of the high-hardness carbide head 1 to the high-toughness carbide bottom 2 is 0.5-2:1, the high-hardness carbide head 1 is guaranteed to be 2-5mm higher than the roller surface, and the axial height h between the top end and the bottom end of the hill-shaped bulge is not less than 1/4 of the diameter D of the composite stud.

The high-hardness carbide head 1 is made of a high-hardness alloy material with a high-hardness cobalt-cemented tungsten-based alloy head, a high-hardness nickel-cemented tungsten-based alloy head, a high-hardness cobalt-cemented titanium-based alloy head, a high-hardness nickel-cemented titanium-based alloy head, a high-hardness tungsten-titanium-cobalt alloy head or a high-hardness tungsten-titanium-nickel alloy head as a base material, namely the head of the composite stud is made of the high-hardness alloy material with one or two of cobalt and nickel as a bonding phase and one or two of tungsten carbide and titanium carbide as the base material; the high-toughness carbide bottom 2 is a high-toughness iron-bonded titanium carbide-based alloy bottom, namely the bottom of the composite stud is made of a high-toughness alloy material of which the bonding phase is iron and the base material is titanium carbide.

The processing steps of the composite stud are as follows:

Firstly, adding high-toughness alloy powder into a die, pressing and forming under pressure, then adding high-hardness alloy powder into the die, pressing and forming under pressure, sintering a pressing blank after pressing is finished, and naturally sintering and melting the powder on a joint surface of the two materials to form a mixed transition area, thereby obtaining the composite stud.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.