KR20010099453A - Manufacturing method of press rollers for office equipment using friction welding of different metal materials - Google Patents

Abstract

One of the core parts of office equipment (copiers, fax machines, printers, etc.) is an extrusion roller which presses the toner melted with a heat caller to a high pressure to fix it onto paper. Most of these rollers are made of iron material, and some non-cut material aluminum is used. Recently, the compaction roller needs more force than the existing black and white mode in accordance with the trend of digitalization and colorization, and thus requires a new manufacturing method.

Compression roller invention of this dissimilar metal material solves this problem by using "friction welding" method, shorten the whole manufacturing process, improve productivity, reduce manufacturing cost and improve working environment, and have a stable product in terms of quality. There is an advantage to mass production. In addition, the concentricity of the product after finishing machining is improved, it can meet the function that requires high-speed rotation, and domestic and overseas demand continues to increase.

Description

Manufacturing method of compression rollers for office equipment using friction welding of dissimilar metal materials {omitted}

The present invention relates to the production of a compaction roller for office equipment through friction welding, the conventional manufacturing technique uses an adhesive, a melt bonding method and a mechanical insertion method. Looking at the manufacturing process up to now, the raw materials are first cut and assembled by the above method, and then roughed, finished and used for various surface treatment. In the case of adhesive, there is a disadvantage of short product life due to lack of durability due to pre-processing the part to be assembled with the adhesive and bonding with the adhesive. In the melt bonding method, the mechanical property of the weld is degraded by heating the material with a heat source and joining. Problems are caused by surface roughness and welding pore, and the structure of plastic pipe is deformed by physical change, so that the part can be inserted into the inner diameter side. have. Products manufactured by the above process are used only in black and white office equipment (copiers, fax machines, printers) due to the change in mechanical properties of the material and the design structure. In the trend of colorization and digitization of newly released office equipment in Korea, new manufacturing methods are required according to the unique function of the compression roller and the strength and light weight of the parts themselves.

The present invention highlights the advantages of maintaining the intrinsic properties of the material among the characteristics of the friction intrusion method to achieve the quality stability and cost reduction of the product. Generally known friction induction method is simpler than the existing method, and does not require any subsidiary materials (welding rods, solvents, etc.) used for welding, such as melt-bonding, and does not generate harmful gases and sparks. It is clean and can be operated in a short time by controlling only a few working conditions. In addition, the energy efficiency is high, the power consumption is low, and the strength of the joint is equal to or greater than the strength of the base material, and after finishing, a superior surface roughness can be obtained uniformly with the base material part. In addition, high dimensional accuracy allows the use of materials close to the actual product, greatly reducing the material savings, and improving the concentricity of the finished product.

In addition, most of the materials used as compression rollers are iron materials or steel materials of intermediate rotating parts used for compression rollers (Korean Industrial Standard KSD3517: STKM 1X series of carbon steel pipe materials for mechanical structures, hereinafter referred to as carbon steel pipes). The steel material used for forming the pipe shape and used for both fixed rotary shafts is a material that requires high machinability (Korean Industrial Standard KSD3567: SUM 2X series and SUM 31 L of sulfur and sulfur compound free cutting steel material) Made of hemp steel material (Korean Industrial Standard KSD3551: office machine parts material of special hemp steel and S45CM, hereinafter special steel) and stainless material (Korean industrial standard KSD3691: STS 3X4, 3X6, 41X series, hereinafter stainless steel of stainless steel forgings) It is applied. Among these materials, free-cutting steel contains non-metallic materials such as sulfur and phosphorus and low melting metals such as lead to improve machinability. These nonmetallic materials and low-melting metals are known to reduce weldability in friction welding. The production conditions have been developed to overcome this problem.

In terms of process conditions, the number of revolutions is 1,200-3,000 circuits per minute, the friction pressure is 4-16 kilograms per square centimeter, the friction time is 3-7 seconds, and the upset (forging) pressure is 18-60 kilologs per square centimeter. The ram and upset time is 2-5 seconds, resulting in a loss of 3-10 millimeters. The fractures obtained under these process conditions were not affected by the weld but were affected by the pipe material at about 3-10 millimeters away from the weld, and the fracture tensile strength was about 90-100% of the base tensile strength of the substrate.

In addition, the roller is used as a compression roller, and aluminum alloy material is used for the middle and middle line pipes, and normal welding and assembly are made of free cutting steel, special steel and stainless steel on the fixed rotating shaft at both ends, and then the outer diameter is cut and the rubber material is cut. It is sometimes used after coating and polishing on an aluminum pipe. The conventional manufacturing method is a structure in which a part of a fixed rotating shaft can be inserted into the pipe by plastic deformation of the pipe by artificially changing physical properties of the aluminum alloy material. It was applied to a very coarse and air intensive manufacturing method using a grooving process, knurling on free cutting steel, special steel and stainless steel, inserting it into an aluminum material, and then pressing it. This process procedure is applied to the aluminum alloy material, free cutting steel, aluminum alloy material and special steel and aluminum alloy material, while reducing the number of processes by applying the friction welding method using the advantage of weldability between dissimilar metals, which is one of the characteristics of friction welding method. Friction welding process conditions were developed to maintain the properties of materials such as stainless steels. At this time, the material used in the compaction roller was replaced with aluminum to reduce the weight of the parts themselves and to develop a structure that can withstand a large load.

By developing the friction welding process conditions as described above, it is possible to manufacture digital and color compression rollers for office equipment requiring large loads, thereby meeting the explosive demand for digital and colorizing office equipment.

1 is a basic principle of friction welding.

2 is a conceptual diagram of friction welding of the compression roller to be completed by the method of FIG.

FIG. 3 shows the compact roller product of the shape part of FIG. 2 completed according to the method of FIG.

4 is a graph showing the change in the hardness of the friction roller compression roller.

Figure 5 is a banding test of the friction welding press roller.

<Explanation of symbols for main parts of drawing>

(1) Rotary shafts (2) Fixed shafts (3), (4) Friction welding materials for compression rollers

(5) Constant pressure (6) Additional pressure (7) Friction contact surface

Hereinafter, the accompanying drawings will be described in detail.

1 is a basic principle of friction welding.

(A) Attach the material (free cutting steel, stainless steel and special steel: 3) to one rotating shaft (1) and the material (aluminum alloy material and carbon steel pipe: 4) to be joined to the other fixed shaft (2). .

(B) The two materials attached are brought into contact with the friction pressure contact 6 with a constant pressure (5).

(C) By applying a constant frictional pressure to the frictional pressure surface, the material of the rotating shaft rotates to generate frictional heat between the two materials, and this frictional heat makes the frictional pressure contact 6 of the material to a certain level of soft state.

(D) It is a method of forming strong interatomic bonds on the friction surface by compressing strongly with the additional pressure (7) while suddenly stopping the line of the rotating shaft (1).

2 is a conceptual diagram of friction welding of a compression roller. In the friction welding between carbon steel pipe and stainless steel, carbon steel pipe and free cutting steel, carbon steel pipe and special steel, and aluminum alloy material and aluminum alloy material, the loss length is constant. In friction welding between the material, special steel, aluminum alloy material and free cutting steel, aluminum alloy material is relatively softer than stainless steel, free cutting steel, and special steel material, so that the flash generated by friction welding is rolled into the grooved part of the fixed rotating shaft material and combined. Designed as below.

FIG. 3 shows a compression roller manufactured by using the material according to the conceptual diagram of the compression roller friction welding of FIG. 2 and using the friction welding principle of FIG. 1. As shown in the figure, the flash was formed in a round shape according to the loss length around the welded part, and discolored over a narrow section on the material surface due to the heat effect generated during the friction welding process. In order to evaluate the mechanical properties, the friction welded product was cut and the microhardness hardness tester was used to examine the microhardness change (FIG. 4). The hardness value of the welded part was higher than that of the discolored intermediate rotary pipe material. As a result, the width of the heat affected zone of the product manufactured by friction welding was narrower than that of the product produced by the general CO2 welding and the argon welding method, and the mechanical properties were better. In addition, in order to prove that the welded part is stronger than the base material of the intermediate rotary pipe material, the friction welded product is chamfered in half of the pipe cross section and subjected to a banning test. This proves that the welding strength is excellent.

Figure 4 is a graph of the numerical values measured using a micro-Vickers hardness tester to show the change in the micro hardness of the friction welding roller.

Figure 5 shows the result of the bending test after chamfering the half of the pipe section in order to prove the excellent welding strength of the friction welding roller.

As mentioned above, the present invention can fully utilize the characteristics of friction welding to reduce materials, to secure sufficient strength of the joints in an environmentally friendly manner, and to produce high-quality products uniformly, thereby reducing the number of processes. You can save money.

Claims (1)

A method for manufacturing press rollers for office equipment using friction welding of dissimilar metal materials applying appropriate friction welding process conditions between press roller materials for office equipment and dissimilar metal materials for compression roller.