KR20050083643A - Surface treatment device using barrel - Google Patents

Abstract

When a plurality of treatments such as a wet blasting and a chemical conversion coating are performed, works are placed from one barrel to another as the treatment precedes to the next step and dents care formed on works through collision of the works with each other. It is possible to provide a surface treatment device using a barrel capable of preventing this. When one treatment is completed in one step, the barrel (2-1) containing the works (1) are moved and carried to the next step. In the next step, a barrel (2-2) is waiting while being immersed in a solution (6). The barrel (2-1) in the previous step is tilted to direct its opening downward, so that the works (1) in the barrel of the previous step slide along a chute (4-1), and loosely drop. The dropped works reach the solution (6) and sink into the barrel (2-2) in the solution (6). The works (1) are dropped one after another. However, the works immediately land on the solution, sink in the solution in a slow movement, and no dents are formed thereon even when the works collide with each other.

Description

Surface Treatment Equipment using Barrels {SURFACE TREATMENT DEVICE USING BARREL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment apparatus for a workpiece when a plurality of processes are continuously performed on one workpiece, and more particularly, to a surface treatment apparatus using a barrel suitable for back plate treatment such as brake lining or clutch facing.

BACKGROUND ART Friction members used in disc brake pads, brake shoes, clutch plates, and the like of automobiles are generally formed by integrally bonding a back plate made of an iron-based metal to a friction material.

These friction members are relatively moved while being pressed between the disc rotor and the counter clutch plate, and the friction force at that time brakes the vehicle or transmits the driving force of the engine to the wheels. Therefore, a large shear force is applied between the friction material and the back plate. Therefore, a strong adhesion between the friction material and the back plate is required to withstand this shear force.

In order to obtain a strong adhesive force suitable for this purpose, conventionally, the adhesive surface of the back plate is roughened to a surface roughness (center line average roughness) Ra of about 1 to 3 µm, and the adhesive area is increased to increase the adhesive strength. In addition, if rust or an oxide film or the like is present on the adhesive surface of the back plate, the adhesive force is lowered. Therefore, both countermeasures such as removal of rust and oxide film and rust prevention are also important.

In view of this, conventionally, a chemical conversion film of zinc calcium phosphate having a film thickness of about 3 to 5 µm is formed on a back plate which has been roughened to remove rust, an oxide film or the like, and a primer agent is applied and baked thereon to have a thickness of 15 to The primer layer was formed in about 25 micrometers. That is, these chemical conversion films and the primer layer played the role of rust prevention. On the other hand, the adhesion with the friction material, by applying a new adhesive on the primer layer, it is bonded with the primer layer and a newly added adhesive.

However, when the surface roughness of the back plate is too large, a portion penetrating the primer layer is formed when the primer layer is formed, and rust is generated therein to reach the inside. On the contrary, when surface roughness is too small, the improvement of adhesive force cannot be expected. For this reason, it is intended to obtain the maximum surface roughness within the range that there is no fear of penetrating the primer layer. This range is about Ra = 1-3 micrometer mentioned above. Therefore, the roughening process of the back plate is very important. So, the conventional method of this roughening is demonstrated below.

The back plate is molded from a steel sheet or the like by punching or the like. Rust, an oxide film, or the like is formed on the surface of the steel sheet before forming. In addition, a large amount of lubricating oil or rust preventing oil adheres when punching and the like. The presence of these oil components and the oxide film is the cause of deterioration in adhesive force and should be removed.

Thus, the molded back plate is degreased with a chlorine solvent to remove oil components such as rust preventive oil. Then, the wet blasted and adhered oxide film and the like are removed, and the surface is roughened in the range of Ra = 1 to 3 µm. At this time, when a few% of the alkali degreasing agent is contained in the water of the wet blast, the degreasing treatment can be carried out simultaneously.

After the wet blasting treatment, the back plate is continuously treated in many processes by water washing, chemical coating treatment, water washing, hot water washing, drying, primer application, drying, baking, adhesive application and drying. Chemical conversion treatment is performed by immersing the workpiece in a liquid such as iron phosphate, zinc phosphate, or zinc phosphate.

There are two methods for the continuous processing. The first is a method of loading on a conveyor in the direction of the work (back plate) and continuously receiving a treatment such as wet blast while being conveyed on the conveyor. This method has a problem that only one side of the workpiece is treated, while the other side is non-uniform in degreasing and chemical conversion coating. In addition, there was also a problem that the workpiece is moved by the slurry sprayed during wet blasting and the direction is changed or falls from the conveyor.

The second method is a method in which a slurry of wet blast is injected while a plurality of workpieces are put in a barrel having an opening and the barrel is rotated while the workpiece is put in the barrel, or the whole barrel is submerged in a liquid to be treated. In this method, as the barrel rotates, the workpiece rolls in the barrel and can evenly treat the entire surface of the workpiece.

In this method, for example, the properties (chemical resistance, shape, etc.) required for the barrel used in each process are different, and if the process is moved while the workpiece is placed in the same barrel, the liquid of the previous process is mixed. For example, the process proceeds while arranging a barrel in each process and moving from the barrel of the previous process to the barrel of the next process.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the surface treatment apparatus using the barrel in this invention.

(Tasks to be solved by the invention)

When the work is exchanged between barrels from the previous process to the next process, the barrel of the previous process is positioned above the barrel of the next process, the barrel of the previous process is inverted, and the work inside is scattered and put into the barrel below. The method is the simplest and can be moved quickly. In this method, however, the workpieces collided with each other, making it easy to generate marks on the workpieces. If a bump is formed, the chemical film of the part may be torn and rust may be easily generated, or the adhesive strength with the friction material may be weakened.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a surface treatment apparatus using a barrel which does not generate marks on the work when moving from barrel to barrel.

(Means to solve the task)

In order to achieve the above object, the surface treatment apparatus using the barrel of the present invention includes a barrel into which a plurality of plate-shaped workpieces are put, a transmission device for rotating and moving each barrel, and a plate-shaped workpiece discharged from the barrel and then put into the next barrel. And a barrel receiving the workpiece fed from the chute, so that the barrel is positioned in the liquid in the processing tank by the transmission.

The liquid may be configured to be a processing liquid for submerging and treating the workpiece, or the transmission may be rotatable while inching the barrel, and may be configured to gradually transfer the workpiece contained in the barrel to the barrel of the next step.

The workpiece is a back plate of a friction material, and the plurality of barrels include a wet blast and a chemical film treatment, and the ratio of the wet blast water to the chemical film treatment water is n (integer): 1. desirable. Moreover, when arrange | positioning several barrels continuously for the same process process, you may be set as the structure which can move a barrel, without moving a workpiece between barrels.

(Action)

The process in one process is performed as it is, putting a workpiece in the barrel. For example, the wet blast slurry is sprayed from the gun toward the barrel in the work to perform wet blast treatment, or the work is immersed in the treatment liquid for each barrel to chemically coat the coating.

When the process in one process is complete | finished, a transmission moves the barrel which the workpiece entered, and conveys it to the next process, and in the next process, the barrel waits in the state submerged in liquid. The transmission rotates and inclines the barrel of the previous process to lower its opening and drops the work in the barrel of the previous process onto the chute. The fallen workpiece enters the liquid and then sinks and is contained within a barrel that is submerged in the liquid. Although the workpieces enter in sequence, the workpieces enter the liquid immediately, so the movement slows down due to the resistance of the liquid, and even if the workpieces collide with each other, the force is weak and does not form a bump.

EMBODIMENT OF THE INVENTION Below, the Example of this invention is described by drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the barrel movement of the surface treatment apparatus using the barrel in this invention. In this embodiment, the work 1 is a back plate of the friction member.

The workpiece 1 is formed by punching in a steel sheet by press or the like, and as described above, there is a rust or an oxide film adhered to the surface of the steel sheet before molding, and a large amount of lubricant or rust prevention used in the punching process. Oil is attached.

Therefore, first, as shown in Fig. 1A, it is placed in the barrel 2-1 and set in the wet blasting apparatus, so that the barrel 2-1 is rotated around the central axis. The slurry containing water and an alkali degreasing agent is sprayed and wet blasted. The workpiece 1 is degreased, the rust and the oxide film are peeled off by the abrasive grains contained in the slurry, and roughened in the range of Ra = 1 to 3 µm.

After the wet blasting process is completed, the barrel 2-1 is moved by a transmission device (not shown) and transported to the next water washing process. In the water washing step, water is placed in the treatment tank 5 as the liquid 6, and almost all of the barrel 2-2 of the next step is submerged in the liquid by the transmission device formed in this step, and is then in the atmosphere. Doing. The opening of the barrel 2-2 is located above.

On the other hand, the transmission apparatus of the wet blast processing apparatus moves the barrel 2-1 of a previous process over the barrel 2-2 of a next process. Next, the transmission rotates the barrel 2-1 as indicated by the arrow so that the opening is downward. In the barrel 2-1, a plate-shaped chute 4-1 is formed along the opening. The work 1 in the barrel 2-1 slides out on the chute 4-1 from the opening and pops out. Conventionally, this protruding workpiece | work 1 was dropped in the air into the barrel 2-2 of the next process. For this reason, the workpieces 1 collided with each other in the barrel 2-2, whereby bumps easily occurred.

However, in the present invention, the protruding work 1 immediately enters the liquid 6 and sinks. And since the opening of the barrel 2-2 of the next process is located in the position which just entered water, the workpiece | work 1 is accommodated in the barrel 2-2. In the liquid, since the movement of the workpiece 1 is significantly slower than in the air, even when the workpieces 1 collide with each other, the collision energy is small, and no bumps are generated. Thereafter, the barrel 2-2 is immersed in the liquid 6 to oscillate in the liquid or the water 1 is washed with the entire barrel 2-2.

When the water washing is completed, the barrel 2-2 is taken out of the liquid 6 by the moving means, and moves to the chemical conversion film treatment step of the next step shown in (c). In the chemical conversion film treatment process, there is a liquid 8 containing any one of iron phosphate, zinc phosphate or zinc phosphate in the treatment tank 7, and the barrel 8 of the next step is included in the liquid 8. Almost all of them are flooded and waiting. The opening of the barrel 2-3 is located above.

On the other hand, the barrel 2-2 of the previous process has a chute 4-2, and when it comes over the barrel 2-3 of the next process, it rotates as shown by an arrow by a transmission apparatus so that opening may become downward. Thereby, the workpiece | work 1 in which slides on the chute 4-2 from the opening of the barrel 2-1, is scattered out, and sticks out.

The protruding workpiece 1 immediately reaches the liquid 8 and sinks. And the opening of the barrel 2-3 of the next process exists in the position which just entered water, and the workpiece | work 1 is accommodated in the barrel 2-3. At this time, even if the workpieces 1 collide with each other, the collision energy is small, so that the bumps do not occur.

Although not shown in the drawing, the above transfer operation is repeated, and the wet blast treatment step → water washing → chemical film treatment → water washing → hot water washing → drying → primer is applied and completed in the last drying step. If (c) is one step from the last, after this process, this barrel (2-3) is taken out of the liquid (8) and dried to the whole barrel (2-3) with the workpiece | work 1 put in. At this time, the workpiece 1 is not moved from the barrel to the barrel. Barrel movement in each process is performed by the transmission apparatus formed in each process.

In the above embodiment, when the work 1 in the barrel of the previous step is moved to the barrel of the next step, the transmission moves to the barrel if the opening of the barrel of the previous step approaches the bottom and the work 1 is likely to pop out of the opening. It is preferable to rotate while inching the rotation of little by little. This is because the work 1 in the barrel gradually shifts to the barrel of the next step to further reduce the number of collisions.

In the above example, when the wet blast process of (a) is compared with the chemical conversion coating process of (c), the time of a wet blast process is nearly doubled. Therefore, when the wet blasting process and the chemical conversion coating process are carried out at 1: 1, the wet blasting process becomes the rate rate. Reducing the treatment time of the wet blast one time in order to increase the processing speed causes treatment unevenness.

In order to solve this problem, the wet blast process water may be formed twice as much as the chemical conversion treatment process water. Specifically, the wet blasting step is added again after the wet blasting step of (a) in FIG. 1. In this case, it is not necessary to move the workpiece 1 from barrel to barrel. In this example, the wet blasting step was almost 2: 1 since the wet blasting step was nearly doubled in the chemical conversion coating step. If 1.8 times, various allocations are possible, such as continuing the process of 0.9 times time twice.

In the above embodiment, the liquid 6 and the liquid 8 also served as the treatment liquid. However, even if there is a treatment step in which the solution is not immersed in the liquid, preparing a treatment tank containing water and the like, and submerging the barrel therein to put the workpiece 1 moved from the previous step will prevent a bump. Good because you can.

And even when the barrel of the next process is immersed in the liquid, the work of moving the work 1 of the previous process may be carried out in the liquid, and the entire barrel does not necessarily need to be immersed in the liquid.

As described above, the work treatment method of the present invention is a surface treatment apparatus using a barrel which treats a work in a barrel and transfers the work in the barrel to the barrel of the next step one or more times. Since the barrel of the next step was immersed in the liquid and the barrel of the previous step was moved to the upper part to move the work in the barrel into the barrel of the liquid. It is possible to prevent the occurrence of.

When the barrel of the previous process is rotated while inching, and the accommodated work is gradually transferred to the barrel of the next process, the collision between the workpieces can be reduced itself, and the effect of preventing bumps is improved.

When the workpiece is a back plate of a friction material, and the plurality of processes include a wet blasting process and a chemical conversion coating process, and the ratio of the wet blasting process water and the chemical conversion coating water is n (integer): 1, Productivity can be improved by shortening the tact time of continuous work.

Claims (5)

A barrel into which a plurality of plate-shaped workpieces are fed, a transmission device for rotating and moving each barrel, and a chute receiving the plate-shaped workpieces discharged from the barrel and feeding them into the next barrel, the barrel receiving the workpieces fed from the chute. And a surface treatment apparatus using a barrel, wherein the transmission apparatus can be disposed in the liquid in the treatment tank. The surface treatment apparatus using a barrel according to claim 1, wherein the liquid is a treatment liquid for immersing and treating a workpiece. The surface treatment apparatus according to claim 1 or 2, wherein the transmission is rotatable while inching the barrel, and the workpiece accommodated in the barrel is gradually transferred to the barrel of the next step. The said workpiece | work is a backplate of a friction material, The several barrel contains for wet blasting and chemical film treatment, The water blasting for water blasting and chemical film treatment of any one of Claims 1-3. A surface treatment apparatus using a barrel, wherein the ratio of numbers is n (integer): 1. The surface treatment apparatus according to claim 4, wherein when the plurality of barrels are continuously arranged for the same treatment step, the barrels can be moved without moving the work between the barrels.