JP4676659B2 - Surface treatment equipment using barrel - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a surface treatment apparatus for a workpiece when a plurality of processes are continuously performed on a single workpiece, and more particularly, to a surface treatment apparatus using a barrel suitable for back plate treatment such as brake lining and clutch facing. .
[0002]
[Prior art]
Friction members used for automobile disc brake pads, brake shoes, clutch plates, and the like are generally formed by integrally bonding a back plate made of an iron-based metal to a friction material.
[0003]
These friction members are moved relative to each other while being pressed between the disk rotor and the counterpart clutch plate, and the vehicle is braked by the friction force at that time or the driving force of the engine is applied to the wheels. Or communicate. Therefore, a large shearing force is applied between the friction material and the back plate. Therefore, a strong adhesive force that can withstand this shearing force is required between the friction material and the back plate.
[0004]
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 (centerline average roughness) Ra = 1-3 μm to increase the adhesive area, Increasing power is being done. Further, if there is rust or an oxide film on the bonding surface of the back plate, it will cause a decrease in the adhesive strength. Therefore, measures for both removal of rust and oxide film and rust prevention are also important.
[0005]
From such a viewpoint, conventionally, a chemical conversion film of zinc calcium phosphate having a thickness of about 3 to 5 μm is formed on the roughened back plate from which rust, oxide film, and the like have been removed. A primer agent was applied and baked to form a primer layer having a thickness of about 15 to 25 μm. In other words, the chemical conversion coating and the primer layer have the role of rust prevention. On the other hand, adhesion to the friction material is performed by applying a new adhesive on the primer layer and bonding the primer layer and the newly added adhesive.
[0006]
By the way, when the surface roughness of the back plate is too large, when the primer layer is formed, a portion that penetrates the primer layer is formed, and rust is generated from this portion to reach the inside. On the other hand, if the surface roughness is too small, improvement in adhesive strength cannot be expected. Therefore, it is desirable to obtain the maximum surface roughness within a range where there is no possibility of breaking through the primer layer. This range is about Ra = 1 to 3 μm described above. Therefore, the process of roughening the back plate is very important during the above processes. Therefore, the conventional method of roughening will be described below.
[0007]
The back plate is formed from a steel plate or the like by stamping or the like, and rust, an oxide film, or the like is formed on the surface of the steel plate before being formed. Further, a large amount of lubricating oil or rust preventive oil adheres during punching or the like. The presence of these oils and oxide films will cause a reduction in adhesion, so we want to remove them.
[0008]
Therefore, the molded back plate is degreased with a chlorinated solvent to remove oil such as rust preventive oil. Then, wet blasting is performed to remove the attached oxide film and the like, and at the same time, the surface is roughened in the range of Ra = 1 to 3 μm. At this time, when a few percent of an alkaline degreasing agent is contained in the water of wet blasting, the above degreasing treatment can be performed simultaneously.
[0009]
The back plate is processed in a number of steps, including wet blasting, water washing, chemical conversion film treatment, water washing, hot water washing, drying, primer application, drying, baking, adhesive application, and drying. It will be. The chemical conversion film treatment is performed by immersing the workpiece in a liquid such as iron phosphate, zinc phosphate, zinc calcium phosphate, etc.
The continuous processing is roughly divided into two methods. The first is a method in which the orientation of the workpiece (back plate) is aligned and placed on a conveyor, and processing such as wet blasting is continuously performed while the workpiece is conveyed on the conveyor. This method has a problem that only one surface of the workpiece is processed, and the opposite surface has unevenness in degreasing and chemical conversion film processing. In addition, during wet blasting, there is a problem in that the workpiece moves due to the sprayed slurry and changes its direction or falls from the conveyor.
[0011]
The second is a method in which a plurality of workpieces are put into a barrel having an opening, and a wet blast slurry is sprayed while rotating the barrel while the workpiece is put in the barrel, or the whole barrel is immersed in a liquid and processed. It is. In this method, since the workpiece rolls in the barrel as the barrel rotates, the entire surface of the workpiece can be processed uniformly.
[0012]
In the case of this method, for example, the properties required for the barrel used in each process (chemical resistance, shape, etc.) are different, and if each work is moved while the work is kept in the same barrel, the previous For reasons such as mixing of the liquid of the process, a barrel is arranged in each process, and the process proceeds while being transferred from the barrel of the previous process to the barrel of the next process.
[0013]
[Problems to be solved by the invention]
When transferring workpieces between barrels from the previous process to the next process, position the barrel of the previous process above the barrel of the next process and turn the barrel of the previous process upside down to disassemble the workpiece in the lower barrel The easiest way to do this is to transfer quickly. However, with this method, the workpieces collided with each other, and it was easy to make a dent on the workpiece. If a dent is made, the chemical film of the part will be torn and rust will be easily generated, or the adhesive strength with the friction material will be weakened.
[0014]
An object of the present invention is to solve such a problem, and it is an object of the present invention to provide a surface treatment apparatus using a barrel in which a workpiece cannot be marked when transferred from the barrel to the barrel.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a surface treatment apparatus using a barrel according to the present invention includes a barrel into which a plurality of plate-shaped workpieces are charged, a rolling device for rotating and moving each barrel, and a plate discharged from the barrel. A barrel that receives the workpiece and throws it into the next barrel, and the barrel that receives the workpiece fed from the chute can be arranged so as to be positioned in the liquid in the processing tank by the rolling device. It is characterized by that.
[0016]
The liquid is a treatment liquid for immersing and processing the workpiece, or the rolling device can rotate while inching the barrel, and the workpiece accommodated in the barrel is gradually barreled in the next step. It can also be set as the structure which transfers to.
[0017]
The workpiece is a friction material back plate, and the plurality of barrels include wet blasting and chemical coating treatment, and the ratio of the number of wet blasting to the number of chemical coating treatment is n (integer): 1 It is desirable to have a configuration. Moreover, when arrange | positioning a some barrel continuously for the same processing process, it is good also as a structure which can move a barrel, without transferring the workpiece | work between barrels.
[0018]
[Action]
The processing in one process is performed with the workpiece placed in the barrel. For example, wet blasting slurry is sprayed from a gun toward the barrel in the workpiece and wet blasting is performed, or the entire barrel is immersed in a processing solution for chemical conversion coating.
[0019]
When the process in one process is completed, the rolling device moves the barrel containing the work and carries it to the next process. In the next process, the rolling device stands by with the barrel immersed in the liquid. The rolling device rotates and tilts the barrel in the previous process so that the opening faces downward, and drops the work in the barrel in the previous process onto the chute. The dropped workpiece lands on the liquid, and is then stored in a barrel that sinks and is immersed in the liquid. Although the workpieces come one after another, since the workpieces immediately enter the liquid, the movement is slowed by the resistance of the liquid, and even if the workpieces collide with each other, the momentum is weak and no dent is formed.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing the movement of a barrel of a surface treatment apparatus using a barrel according to the present invention. The workpiece 1 in this embodiment is a back plate of a friction member.
[0021]
The workpiece 1 is formed by punching from a steel plate with a press or the like, and as described above, there is rust or oxide film adhering to the surface of the steel plate before forming, and it is used at the time of punching. A large amount of lubricating oil or rust-preventing oil adhered.
[0022]
Therefore, first, as shown in FIG. 1A, it is placed in the barrel 2-1, set in the wet blasting apparatus, the barrel 2-1 is rotated around the central axis, and the blast gun 3 A slurry containing water and an alkaline degreasing agent is sprayed and wet blasting is performed. The workpiece 1 is degreased, the rust and the oxide film are peeled off by the abrasive grains contained in the slurry, and the surface is roughened in the range of Ra = 1 to 3 μm.
[0023]
When the wet blasting process is completed, the barrel 2-1 is moved by a rolling device (not shown) and is carried to the next water washing step. In the water washing process, water is put in the treatment tank 5 as the liquid 6, and the barrel 2-2 of the next process is immersed in the liquid almost completely by the rolling device provided in this process and waits. Yes. The opening of the barrel 2-2 is located on the upper side.
[0024]
On the other hand, the rolling device of the wet blast processing apparatus moves the barrel 2-1 of the previous process onto the barrel 2-2 of the next process. Next, the rolling device rotates the barrel 2-1 as indicated by the arrow so that the opening faces downward. The barrel 2-1 is provided with a plate-like chute 4-1 along the opening. The work 1 in the barrel 2-1 slides out on the chute 4-1 from the opening and jumps out. Conventionally, the projecting workpiece 1 is dropped into the barrel 2-2 of the next process in the air. Therefore, the workpieces 1 collided with each other in the barrel 2-2, and it was easy to make a dent.
[0025]
However, in the present invention, the workpiece 1 that has jumped out immediately reaches the liquid 6 and sinks. And since the opening of the barrel 2-2 of the next process is made in the position which just landed, the workpiece | work 1 is accommodated in the barrel 2-2. Since the movement of the workpiece 1 is significantly slower in the liquid than in the air, even if the workpieces 1 collide with each other, the energy of the collision is small and no dent is formed. Thereafter, the work 1 is washed with the whole barrel 2-2 by immersing the barrel 2-2 in the liquid 6 and swinging it in the liquid.
[0026]
When the water washing is completed, the barrel 2-2 is pulled up from the liquid 6 by the moving means, and moves to the next chemical conversion film treatment step shown in (c). In the chemical conversion film treatment process, there is a liquid 8 containing either iron phosphate, zinc phosphate or zinc calcium phosphate in the treatment tank 7, and the barrel 2-3 of the next process is immersed in this liquid 8 almost entirely. Waiting. The opening of the barrel 2-3 is located on the upper side.
[0027]
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, the rolling device rotates as shown by the arrow so that the opening faces downward. To do. As a result, the inner work 1 slides out on the chute 4-2 from the opening of the barrel 2-1, and jumps out.
[0028]
The workpiece 1 that has jumped out 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 landed, 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 energy of the collision is small and no dent is formed.
[0029]
Although not shown in the figure, the above transfer operation is repeated, and wet blasting process → water washing → chemical conversion film treatment → water washing → hot water washing → drying → priming agent application, which is completed in the final drying process. If (c) is the last previous step, when this step is finished, the barrel 2-3 is pulled up from the liquid 8, and the whole barrel 2-3 is dried while the workpiece 1 is kept. At this time, the workpiece 1 is not transferred from the barrel to the barrel. The movement of the barrel in each process is performed by a rolling device provided in each process.
[0030]
In the above embodiment, when the work 1 in the barrel in the previous process is transferred to the barrel in the next process, if the opening of the barrel in the previous process approaches downward and the work 1 is about to jump out of the opening, the rolling device is It is desirable to rotate the barrel while inching little by little. By doing so, the work 1 in the barrel gradually shifts to the barrel of the next process, and the number of collisions can be further reduced.
[0031]
In the above embodiment, when the wet blasting process (a) and the chemical film treatment process (c) are compared, the wet blasting process takes approximately twice as long. Therefore, when the wet blast process and the chemical conversion film treatment process are performed at a ratio of 1: 1, the wet blast process becomes rate-limiting. If the processing time for one wet blasting is reduced in order to increase the processing speed, processing unevenness occurs.
[0032]
In order to solve this problem, it is preferable to provide twice the number of wet blasting steps as the number of chemical conversion coating treatment steps. Specifically, in FIG. 1, the wet blast process is added again after the wet blast process of (a). In this case, it is not necessary to transfer the workpiece 1 from the barrel to the barrel. In this embodiment, since the wet blasting process was approximately twice as long as the chemical film treatment process, the ratio was set to 2: 1. If it is 1.8 times, various allocations are possible, such as two consecutive steps of 0.9 times time.
[0033]
In the above embodiment, the liquid 6 and the liquid 8 also serve as a processing liquid. However, even when there is a treatment process that is not treated by being immersed in the liquid, it is possible to prevent a dent by preparing a treatment tank containing water and soaking the barrel into the treatment tank and receiving the workpiece 1 from the previous process. So convenient.
Furthermore, when attaching the barrel of the next process in the liquid, it is only necessary to transfer the work 1 of the previous process in the liquid, and it is not always necessary to immerse the entire barrel in the liquid.
[0034]
【The invention's effect】
As described above, the workpiece processing method of the present invention is a barrel in which processing is performed in a state where the workpiece is placed in the barrel, and the processing in the barrel after processing is transferred to the barrel of the next process and processed one or more times. In the surface treatment apparatus using the above, the barrel of the next process is immersed in the liquid, and the barrel of the previous process is moved above it so that the workpiece inside is transferred into the barrel in the liquid. They can collide with each other in the liquid, and the impact of the collision can be reduced to prevent the formation of dents.
[0035]
If the barrel of the previous process is rotated while inching, and the stored workpiece is gradually transferred to the barrel of the next process, the collision between the workpieces itself can be reduced, and the effect of preventing dents can be achieved. improves.
[0036]
The workpiece is a friction material back plate, and the plurality of processes includes a wet blast process and a chemical conversion film treatment process, and the ratio of the number of wet blast processes to the number of chemical conversion film treatment processes is n (integer): 1. With this configuration, the tact time of the flow work can be shortened and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a surface treatment apparatus using a barrel according to the present invention.
[Explanation of symbols]
1 Workpieces 2-1, 2-2, 2-3 Barrel 4-1, 4-2 Chute 6, 8 liquid

Claims (5)

A barrel into which a plurality of plate-like workpieces are thrown, a rolling device that rotates and moves each barrel, and a chute that receives the plate-like workpiece discharged from the barrel and throws it into the next barrel. A surface treatment apparatus using a barrel, wherein a barrel for receiving a workpiece loaded from the barrel can be arranged so as to be positioned in a liquid in a treatment tank by the rolling device. 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 using a barrel according to claim 1 or 2, wherein the rolling device is rotatable while inching the barrel, and the workpiece housed in the barrel is gradually transferred to the barrel of the next step. Processing equipment. The workpiece is a friction material back plate, and the plurality of barrels include wet blasting and chemical coating treatment, and the ratio of the number of wet blasting to the number of chemical coating treatment is n (integer): 1 The surface treatment apparatus using a barrel according to any one of claims 1 to 3, wherein The barrel according to claim 4, wherein when a plurality of barrels are continuously arranged for the same processing step, the barrel can be moved without transferring the workpiece between the barrels. Surface treatment equipment.

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