KR100461342B1 - Manufacturing method and a burnishing apparatus for a development roller - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal, in particular an aluminum developing roller, used in an electrophotographic image forming apparatus, and a burnishing apparatus for use in the manufacture thereof. The manufacturing process of the developing roller includes the steps of processing the shape of a predetermined developing roller, grinding the roller part of the developing roller processed in the shape processing step, and burning the roller part polished by the burnishing roller. ), A process of sanding the roller portion burned in the burnishing process by a sand blasting machine, and a process of plating the sanded roller portion in the sanding process. In addition, the burnishing apparatus according to the present invention supports the developing roller having the roller portion polished, and supports and supports the developing roller so that the two supporting rollers face each other, and presses the developing roller against the supporting roller and rotates at the same time. And a burnishing roller for burnishing the roller portion of the roller. The aluminum developing roller produced by the manufacturing method and burnishing apparatus according to the present invention has a smooth surface.

Description

Manufacturing method and a burnishing apparatus for a development roller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a developing roller of an electrophotographic image forming machine, and more particularly, to a method of manufacturing a developing roller made of a metallic material and a burnishing apparatus used in the method of manufacturing the same.

Referring to FIG. 1, a general electrophotographic image forming apparatus charges the photosensitive member 1 by the charger 2 and exposes the electrostatic latent image by exposing it with a laser 3 generated from the laser scanning device 14. . The toner 8 contained in the developing unit 4 is supplied to the developing roller 5 by the supply roller 6. The toner conveyed to the developing roller 5 is thinned to a uniform thickness by the layer regulating member 7, and at the same time, the toner is highly charged by the developing roller 5 and the layer regulating member 7. The toner passing through the layer controlling member 7 develops the electrostatic latent image formed on the photosensitive member 1, and the electrostatic latent image developed by the toner is transferred to the printing paper 13 by the transfer roller 9, and then the fixing unit 12 Settled by). The toner remaining on the photoconductor 1 after being developed is removed by the cleaner 10 and recovered to the toner recovery container 11.

The developing roller 5 is used in various forms depending on the developing method for developing the toner 8 to the photosensitive member 1 and the type of toner used. One of them is a metal developing roller used in a one-component non-contact developing method. Metal developing rollers are generally used aluminum developing rollers using aluminum (Al) -based metal as the material.

As shown in FIG. 2, the manufacturing method for manufacturing the metal developing roller is composed of a shape processing step (S11), a polishing step (S12), a sanding step (S13), and a plating step (S14).

In the shape processing step (S11), raw materials such as metal rods or drawing rods are cut by a processing machine such as a CNC lathe and processed into a developing roller having a desired shape.

In the polishing step S12, the surface of the roller portion of the developing roller is polished by the grinding wheel for the metal developing roller whose shape processing is completed. In the case of the aluminum developing roller, the surface of the roller part is polished using an aluminum grinding wheel.

In the sanding step S13, the sanding agent is injected into the roller portion of the polished metal developing roller by a sand blast machine, and the sanding agent collides with the surface of the roller portion at high speed. When sanding is applied, compressive residual stress is generated on the surface of the roller, thereby improving mechanical properties such as durability of the roller. In the sanding process, sanding agents such as glass # 175 to 325, glass # 400, and diamond steel # 600 are used.

In the plating step S14, electroless nickel (Ni) plating is performed on the roller portion of the metal developing roller where sanding is completed.

However, the surface roughness of the metal developing roller produced by the manufacturing process as described above is very large depending on the degree of processing machine, cutting conditions and polishing conditions.

Table 1 below shows the surface roughness of the roller part of the aluminum developing roller manufactured by the above processing process, and FIG. 3 shows a micrograph of the roller part enlarged 200 times.

Sanding agent Roughness before plating Roughness after plating glass # 175 ~ 325 Rz 3.0 ~ 5.2㎛ Rz 2.94 ~ 5.12㎛ glass # 400 Rz 1.6 ~ 4.12㎛ Rz 1.5 ~ 4.08㎛ Geumgangsa Temple # 600 Rz 1.33 ~ 2.6㎛ Rz 1.31 ~ 2.2㎛

Referring to Table 1, the surface roughness after the sanding process is very large, it can be seen that even if the plating does not improve the roughness. In addition, it can be seen that it is very difficult to obtain an aluminum developing roller that satisfies the surface roughness of 2 μm or less required for uniformly and stably transferring toner. 3, the irregularities are formed at very narrow intervals so that the surface of the roller is very rough and uneven.

The present invention was devised to solve the above problems, and the surface of the developing roller is uniformly and stably transporting the toner so as to obtain a high image quality with an electrophotographic image forming apparatus using a metallic developing roller. It is an object of the present invention to provide a manufacturing method for producing a metal developing roller having a uniform surface having a large roller surface with a roughness of 2 μm or less and having a small dispersion, and a burnishing device used in the manufacturing method. .

1 is a schematic diagram of a general electrophotographic image forming apparatus;

2 is a flow chart showing a conventional metal developing roller manufacturing method;

FIG. 3 is a micrograph at 200 times magnification of the surface of the roller of the developing roller manufactured by the manufacturing method of FIG. 2;

Figure 4 is a flow chart showing a metal developing roller manufacturing method according to the present invention,

5 is a front view of a developing roller manufactured in the manufacturing method of FIG. 4;

6A and 6B are side and front views of a first embodiment of a burnishing device used in the manufacturing method of FIG. 4;

7A and 7B are side and front views of a second embodiment of the burnishing device used in the manufacturing method of FIG. 4;

FIG. 8 is a micrograph at 200 times magnification of the surface of the roller of the developing roller manufactured by the manufacturing method of FIG. 4.

* Description of Symbols for Major Parts of Drawings *

20; Developing roller 21; Roller part

22; Axis of rotation 30,30 '; Support Roller Part

31,33; Support rollers 40 and 40 '; Burnishing Roller

41; Burnishing roll 42; Axis of rotation

In order to achieve the above object, the manufacturing method of the developing roller according to the present invention includes a process of processing a shape of a developing roller used in an electrophotographic image forming apparatus from a metallic material, and the developing processed in a shape processing process. Polishing the roller portion of the roller, burning the roller portion polished in the polishing process with a burnishing roller, and sanding the roller portion burned in the burnishing process with a sand blasting machine. (Sanding), and a step of plating the roller portion sanded in the sanding process.

Here, the developing roller is preferably an aluminum developing roller made of aluminum-based metal.

In the burnishing process, the roller portion of the developing roller which is supported by the supporting roller is burnished by the burnishing roller or is supported by the supporting roller, and the roller portion of the developing roller which is conveyed in the axial direction at the same time. It is characterized by burnishing by a single roller.

The sanding process may be performed by sanding the roller part of the developing roller using a sanding agent of any one of glass # 175 to 325, glass # 400, or gold steel yarn # 600. The roller portion is plated with electroless nickel (Ni).

In addition, the burnishing apparatus according to the present invention used in the burnishing process in order to achieve the above object, the support roller portion is supported so that the two support rollers facing the development roller, the roller is polished, and the development And pressurizing the roller against the support roller, and burnishing roller burnishing the roller of the developing roller.

Here, the support rollers are installed so that the tapered support rollers face each other in a staggered state, and the support rollers are supported so that the developing roller is moved in the axial direction of one side by rotation of the support rollers. It is characterized by being installed obliquely.

The burnishing roller is characterized in that a plurality of burnishing rolls are assembled on a rotating shaft, and the burnishing roller preferably has three burnishing rolls.

In addition, the support roller is made of SKH4 special steel, the burnishing roller is preferably made of cemented carbide.

Hereinafter, a manufacturing method and a burnishing apparatus of a developing roller according to the present invention will be described in detail with reference to the accompanying drawings.

4, the manufacturing method of the developing roller according to the present invention includes a shape processing step (S21), polishing step (S22), burnishing step (S23), sanding step (S24), and plating step (S25). do.

The shape processing step (S21) is a step of processing a metal bar or a drawing bar with a developing roller having a desired shape by a processing machine. FIG. 5 shows an example of the developing roller 20 processed in the shape processing step S21. The developing roller 20 is composed of a roller portion 21 for conveying toner and a rotating shaft 22 for supporting rotation of the roller portion 21. As the metal material, an aluminum-based metal is usually used. In addition, the machining machine is a CNC lathe or the like for the degree of processing, but any machine can be used as long as it is a machining machine capable of processing the developer roller 20 to a predetermined shape designed. When the developing roller 20 is processed by a CNC lathe, it is processed under a machining condition of about 1800 RPM of the spindle speed, a feed rate of 0.04MM, and a hydraulic pressure of 0.5Kg of the center bar.

The polishing step (S22) is a step of polishing the surface of the roller portion 21 by using a grindstone suitable for the material of the metal, using the roller portion 21 of the metal developing roller on which the shape processing is completed. In the case of the aluminum-based developing roller, it is polished under the conditions of dedicated aluminum grindstone # 600, feed rate 60RPM, and braid 12.0t, and the cleaning liquid is continuously supplied to the processing part during processing.

The burnishing process S23 rotates the burnishing roller while pressing the roller portion of the developing roller with the burnishing roller while the roller is polished by the supporting roller portion to burnish the roller portion of the developing roller. At this time, the support roller portion can be installed to burnish the roller portion of the development roller by arranging two support rollers machined in the same tapered shape and staggering each other to support the development roller. In addition, it is preferable that the two supporting rollers are installed to be inclined with each other so that the developing roller supported by the two supporting rollers can be moved in the axial direction of the developing roller by the rotation of the supporting rollers. Then, since the developing roller is burnished while being moved in the axial direction, continuous processing is possible. The inclination between the two supporting rollers is appropriately selected according to the axial feed speed of the developing roller required for burnishing. The surface of the roller portion of the burnishing processing roller causes plastic deformation, so that the uneven portion becomes smooth.

Sanding process (S24) is a process of processing the surface of the developing roller by spraying the sanding agent at a high pressure using a sand blasting machine (Sand Blasting Machine) on the burner processing metal development roller. At this time, as the sanding agent, any one of glass # 175 to 325, glass # 400, or gold steel # 600 is used. The developing roller that is sanded is improved in mechanical properties such as durability of the roller surface.

The plating process (S25) is a process of electroless nickel (Ni) plating on the roller portion of the developing roller after the sanding is completed.

Surface roughness of the aluminum-based developing roller roller manufactured by the above process is shown in Table 2 below. Moreover, the photograph which enlarged the surface part of the roller part by 200 times is shown in FIG.

Sanding agent Roughness before plating Roughness after plating Glass # 175-325 Rz 1.8 ~ 2.37㎛ Rz 1.85 ~ 2.09㎛ Glass # 400 Rz 1.48 ~ 1.94㎛ Rz 1.47 ~ 1.97㎛ Geumgangsa Temple # 600 Rz 1.18 ~ 1.59㎛ Rz 1.13 ~ 1.57㎛

Referring to this, it can be seen that the developing roller produced by the present invention has a surface roughness of about 2 μm or less and a small scatter.

Hereinafter, the configuration and operation of the burnishing apparatus according to the present invention used in the burnishing process will be described.

6A and 6B, the first embodiment of the burnishing device is as follows.

The burnishing device includes a support roller portion 30 for supporting the developing roller 20 and a burnishing roller 40 for burnishing the roller portion of the developing roller 20.

The support roller part 30 is usually composed of two support rollers 31, and the two support rollers 31 are installed to face each other. The two support rollers 31 are cylindrical in shape and have the same size. In addition, the support roller 31 may be installed to rotate freely or may be controlled to rotate at a suitable speed for the burnishing process according to the rotation of the burnishing roller 40. The support roller 31 is a material having a greater strength than the material of the developing roller 20 to be processed, and in the case of the aluminum developing roller, SKH4 special steel material is preferably used.

The burnishing roller 40 has a size corresponding to the length of the roller portion of the developing roller 20. In general, it is preferable that the length of the burnishing roller 40 is slightly larger than the length of the roller portion of the developing roller 20. Since the burnishing roller 40 is a tool for directly processing the roller part of the developing roller 20 against the support roller 31, the burnishing roller 40 needs to be large in strength, so that it is generally made of cemented carbide (high) material.

The developing roller 20 is placed between the two supporting rollers 31, and the burnishing roller 40 is placed on the upper side of the developing roller 20, and then set to pressurize the developing roller 20 at a pressure suitable for burnishing. do. Then, when the burnishing roller 40 is rotated, the developing roller 20 is rotated by the rotational force, and the roller portion of the developing roller 20 is burnishing. When the burnishing process is completed, the burnishing process is completed by removing the burnishing roller 40 on the upper side and then laying down the developing roller 20 in which the machining is completed.

Further, a second embodiment of the burnishing device according to the present invention is shown in Figs. 7A and 7B.

Referring to the drawings, the burnishing device includes a support roller portion 30 'for supporting the developing roller 20 and a burnishing roller 40' for burnishing the roller portion of the developing roller 20.

The support roller portion 30 'is usually composed of two support rollers 33, and the two support rollers 33 have the same tapered shape and are installed to face each other in a staggered state. In addition, the support roller 33 may be installed so as to rotate freely or may be controlled to rotate at a suitable speed for burnishing according to the rotation of the burnishing roller 40 '. At this time, it is preferable to install the two supporting rollers 33 to have a predetermined inclination so that the developing roller 20 supported by the rotation of the supporting rollers 33 can be moved in one of the axial directions. As a result, the developing roller 20 is burned and processed efficiently.

The support roller 33 is a material having a greater strength than the material of the developing roller 20 to be processed, it is preferable to be made of SKH4 special steel material when processing the aluminum developing roller.

The burnishing roller 40 'is composed of a plurality of burnishing rolls 41 assembled to the rotating shaft 42 at regular intervals from the rotating shaft 42. The rotating shaft 42 is fixed to the body of the burnishing device (not shown) and is connected to a driving source such as a motor to press the developing roller 20 against the support roller portion 30 'and simultaneously rotate the burnishing roll 41. . At this time, it is preferable to make the burnishing roller 40 'by assembling the three burnishing rolls 41 to the rotary shaft 42. In general, it is preferable that the length of the burnishing roller 40 'is slightly larger than the length of the roller portion of the developing roller 20, but in this embodiment, the developing roller 20 is axially supported by the supporting roller portion 30'. Since the burnishing roller 40 'is smaller than the length of the roller portion of the developing roller 20, burnishing may be performed with respect to the entire length of the roller portion of the developing roller 20. In this embodiment, the length of the burnishing roller 40 'corresponds to about 1/2 of the length of the roller portion of the developing roller 20. In addition, since the burnishing roll 41 is a tool for directly processing while pressing the roller portion of the developing roller 20 against the support roller 33, the burnishing roll 41 is generally made of cemented carbide (high) material.

When the developing roller 20 is placed at one end between the two supporting rollers 33 of the supporting roller part 30 ', the supporting roller 33 rotates and the developing roller 20 moves to the lower end of the burnishing roller 40'. Will enter. When the developing roller 20 is sandwiched between the burnishing roll 41 and the support roller 33, the roller portion of the developing roller 20 is burnishing by the burnishing roll 41 and continues to move in the axial direction. When the burnishing process for one developing roller 20 is completed, the developing roller supplied subsequently continues to burnishing.

As described above, the developing roller manufactured by the manufacturing method of the present invention roller and the burnishing device can manage the surface roughness to 2 占 퐉 or less, and the scattering is reduced. In addition, as can be seen in the enlarged photograph of the surface of the developing roller roller in FIG. 8, the developing roller according to the present invention has a wider unevenness and a smoother developing roller. It is transferred uniformly and stably to obtain high image quality.

The present invention is not limited to the above-described specific embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such changes are intended to fall within the scope of the claims.

Claims (13)

Processing a shape of the developing roller used in the electrophotographic image forming apparatus from a metal material; Polishing a roller portion of the developing roller processed in the shape processing step; Burnishing the roller portion by rotating the burnishing roller while pressing the roller portion with a burnishing roller while supporting the roller portion polished in the polishing step; Sanding the burned roller portion in the burnishing process by a sand blasting machine (Sand Blasting Machine); And And plating the sanded roller portion in the sanding process. The method of claim 1, wherein the developing roller is made of an aluminum-based metal. 2. The developing roller manufacturing method according to claim 1, wherein the burnishing process is performed by burning the roller of the developing roller supported by the supporting roller by the burnishing roller. 4. The method of claim 3, wherein the support roller transports the developing roller in the axial direction while supporting the developing roller. The developing roller according to claim 1, wherein the sanding process sands the roller of the developing roller using a sanding agent of any one of glass # 175 to 325, glass # 400, or gold steel yarn # 600. Manufacturing method. The method of claim 1, wherein the plating process is characterized in that the roller portion of the developing roller is electroless nickel (Ni) plating. A support roller unit for supporting the developing roller in which the roller unit is polished and having two support rollers facing each other; And And a burnishing roller which presses the developing roller simultaneously with the supporting roller portion and burns the roller portion of the developing roller. 8. The burnishing device according to claim 7, wherein the support rollers are installed such that two support rollers having a tapered shape face each other in a staggered state. The burnishing apparatus according to claim 8, wherein the support roller is installed to be inclined so that the developing roller is moved in the axial direction of one side by the rotation of the support roller. 8. The burnishing device according to claim 7, wherein the burnishing roller has a plurality of burnishing rolls assembled on a rotating shaft. 11. The burnishing device according to claim 10, wherein the burnishing roller has three burnishing rolls. The burnishing device according to any one of claims 7 to 9, wherein the support roller is made of SKH4 special steel. The burnishing device according to any one of claims 7 to 10, wherein the burnishing roller is made of cemented carbide.