WO2004048040A1

WO2004048040A1 - Surface treating device for plate-like work

Info

Publication number: WO2004048040A1
Application number: PCT/JP2002/012415
Authority: WO
Inventors: Toru Matsubara
Original assignee: Macoho.,Ltd
Priority date: 2002-11-28
Filing date: 2002-11-28
Publication date: 2004-06-10
Also published as: AU2002354067A1

Abstract

A surface treating device for plate-like works capable of uniformly surface-treating both front and rear surfaces of the works in a short time, comprising tumblers (1) allowing a plurality of plate-like works (2) to be inputted thereinto and rotatable around the center axis (a) and a plurality of abrasive grain projection means (105) projecting abrasive grain to the plate-like works into the tumblers, the abrasive grain projection means being such formed that the projection directions thereof can be altered independently of each other, wherein the plurality of plate-like works (2) are inputted into the tumblers (1), abrasive grain is projected from a plurality of directions (A) and (B) while the tumblers are rotated, the works are surface-treated by the projection from mainly (A), abrasive grain is provided, by the projection from (B), into a work space (V) involving the plate-like works (2) in the tumblers near the tip thereof in rotating direction to promote the reverse rotation of the plate-like works so as to shorten a time for surface treatment.

Description

Surface treatment equipment for plate-like work

The present invention relates to a surface treatment of a plate-shaped work, and more particularly to a surface treatment of a back plate of a friction member used for a brake clutch of an automobile. Conventional technology

A friction member used for a disc brake pad, a rake, a clutch plate and the like of an automobile is 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 disk opening and the clutch plate on the other side, and the frictional force at that time is used to brake the vehicle or to drive the engine. To the wheels. Therefore, a large shear force is applied between the friction material and the back plate. Therefore, a strong adhesive force between the friction material and the back plate that can withstand this shear force is required. In order to obtain a strong adhesive force suitable for this purpose, the bonding surface of the back plate has been conventionally roughened to a surface roughness (center line average roughness) Ra == l to 7 m to increase the bonding area. In addition, increasing the adhesive force has been performed. In addition, if there is a mackerel or an oxide film on the bonding surface of the back plate, the adhesive strength is reduced. Therefore, it is also important to take measures for both removing the mackerel and the oxide film and preventing the mackerel.

From this point of view, conventionally, a conversion coating of zinc calcium phosphate having a thickness of about 3 to 5 Aim is formed on a back plate from which the roughened surface, the mackerel, the oxide film, and the like have been removed, A primer was applied and baked to form a single layer of primer with a thickness of about 15 to 25 zm. In other words, the chemical conversion coating and the primer layer served as the role of a saber. On the other hand, when bonding with a friction material, a new adhesive is applied on the primer layer, and the primer layer and the newly added adhesive are bonded.

By the way, if the surface roughness of the back plate was too large, a primer layer was formed. Sometimes, there is a part that penetrates the primer layer, and 鲭 is generated from here and reaches inside. Conversely, if the surface roughness is too small, no improvement in adhesive strength can be expected. Therefore, we want to obtain the maximum surface roughness within the range where there is no risk of breaking through the single primer layer. This range is the above-mentioned (center line average roughness) Ra = l to 7 zm. Therefore, of the above steps, the step of roughening the back plate is very important. Therefore, the conventional method of this roughening will be further described below.

The pack plate is formed from a steel plate or the like by stamping with a press or the like. Before the forming process, a mackerel, an oxide film, or the like is formed on the surface of the steel plate. Also, a large amount of lubricating oil and anti-reflection oil adheres during punching and the like. The presence of these oils and oxide films will cause a decrease in adhesive strength, and should be removed.

Therefore, the molded back plate is first degreased with a chlorine-based solvent to remove oil components such as gas-proof oil. Then, by the dry grid plast method, 鉄 iron grid particles are beaten to the back plate by roasting or the like to roughen the surface to the above-mentioned range of Ra = l to 7 m, and at the same time remove oxide film etc. . Thereafter, a conversion coating of zinc calcium phosphate for protection was formed, and a primer was applied and baked thereon, and then a friction material was bonded with an adhesive.

However, this method has problems in that the generation of dust is extremely large and that the waste liquid is treated because a chlorine-based solvent is used. Therefore, a method using the wet blast method has been adopted. This method is also advantageous in that the blasting step and the degreasing step can be performed together. That is, a large number of workpieces are put into a tumbler, and the tumbling is performed by rotating the tumbler and spraying water (slurry) containing abrasive grains with high-pressure air onto the rotating workpiece in the tumbler. .

The slurry is prepared by mixing alumina abrasive grains in water and further containing an alkali degreasing agent by several percent. Since it is a wet method, no dust is generated. In addition, the alumina abrasive has a strong grinding force, can obtain a predetermined surface roughness in a short time, and is an excellent method in which an alkaline degreasing agent is mixed, so that degreasing can be performed.

Further, the tumbling blast method has an advantage that not only the front and back surfaces of the back plate, which is a plate-like work, but also all the side surfaces and even the inner surface of the mounting plate if there is a mounting hole can be processed. 4A and 4B are diagrams for explaining the movement of the plate-like pad 2 in the tumbler 1. FIG. 4A is a perspective view of the tumbler 1, and FIG. The tumbler 1 shown in these figures is frusto-conical, with the wider one being the opening 1a and the narrower one being the bottom lb. A polyurethane layer having a thickness of several millimeters is formed inside the tumbler 1 so as to reduce abrasion caused by the abrasive grains projected. Although not shown, the tumbler 1 is provided with a number of holes, not shown, so that one slurry does not accumulate inside the tumbler.

A plurality of plate-like works 2 are put in the tumbler 1, and the tumbler 1 rotates around its central axis a. The plate-like work 2 rolled up along the body of the tumbler 1 by this rotation rolls so as to fall by its own weight. Ideally, if the plate-like mark 2 rolls in a plane perpendicular to the central axis a, uniform stirring can be achieved. Further, in order for the plate-shaped work 2 to roll, a space surrounded by a dotted line in the tumbler 1 is required, and the volume that can be processed is determined by the shape and size of the tumbler 1. Problems the invention is trying to solve

Abrasive particles are blasted between the lines 3 and 4 in FIG. 4 (a) by blast. The plate-like work 2 is pressed against the body of the tumbler 1 by such a blast. Therefore, the rolling motion of the plate-like work 2 is significantly restricted. In particular, in the case of wet blasting, the slurry liquid makes it easy for the plate-like works 2 to come into contact with each other or between the plate-like work 2 and the body of the tumbler 1, so that they are less likely to peel off. Therefore, it was difficult to uniformly treat both surfaces of the plate-shaped work 2.

In the past, this has been dealt with by increasing the blast processing time or reducing the amount of processing at one time. By the way, the manufacturing process of the back plate is usually a work-in-process method, and once the surface treatment process is completed, the next chemical conversion treatment is performed. There is a water washing step before and after the chemical conversion treatment, and each step is treated in the same time. This time is the tact time, but determining this tact time is the most time-consuming process, and the time required for that process is rate-limiting. The above-mentioned conventional blasting process is rate-limiting because it takes the longest time in backplate manufacturing, so the tact time is lengthened and the net of the backplate manufacturing process is increased. Had become.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a surface treatment apparatus for a plate-like work capable of uniformly performing surface treatment on both front and back surfaces in a short time. Means for solving the problem

In order to achieve the above object, a surface treatment apparatus for a plate-like work according to the present invention comprises: a tumbler into which a plurality of plate-like works are inserted and rotatable around a central axis; And a plurality of abrasive grain projection means for projecting abrasive grains for processing, wherein the projection direction of the abrasive grain projection means can be independently changed. In the tumbler, a work space including most of the plate-like work is defined, and at least one of the abrasive projecting means is configured to project the vicinity of the front end of the work space in the rotation direction. The abrasive grain projecting means may have a process gun for ejecting a slurry liquid containing abrasive grains. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram schematically showing the entire configuration of a surface treatment apparatus for a plate-like work according to the present invention, and FIG. 2 is a diagram showing one of the tumblers of FIG. 1 taken out. FIG. 1 (a) is a perspective view of the tumbler. FIG. 3 (b) is a view of the bottom view from the opening side of the tumbler, FIG. 3 is a view of the second embodiment of the present invention, (a) is a perspective view of the tumbler, and (b) is a view from the opening side of the tumbler. FIG. 4 is a view illustrating the movement of the plate-like work in the tumbler. FIG. 4 (a) is a perspective view of the tumbler, and FIG. 4 (b) is a view as viewed from the opening end of the tumbler. Embodiment of the Invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram schematically showing an entire configuration of a plate-like workpiece surface treatment apparatus 100 according to the present invention. As shown in the figure, the surface treatment apparatus 100 has chambers 101 and 102 having a substantially symmetrical shape on the left and right. A plast tank 104 is provided below the chambers 101 and 102. Plast tank 104 The part is divided into a left part 104a, which is directly below the bars 101, 102, and a right part 104b, which are connected at the top. Inside the chambers 101 and 102, there are four process guns 105 as abrasive grain projection means, one tumbler 1 for two process guns 105 and a total of four tumblers 1 Have been. Each tumbler 1 is rotatably supported around a central axis by driving means (not shown). In addition, each process gun 105 is supported by a ball joint or the like, so that the projection direction of the slurry liquid can be freely changed.

Four tumblers 1 are provided to shorten the tact time, and two tumblers are replaced with new plate-like works.

Although the illustrated tumbler 1 has a truncated cone shape, the shape of the tumbler 1 is not limited to this, and may be a columnar shape or a via barrel shape.

In the blast tank 104, a slurry liquid S in which water and abrasive grains necessary for blast processing are mixed is stored. Water is mixed with an alkaline degreasing agent to a predetermined concentration. Abrasive grains generally have a higher specific gravity than water and settle in the plast tank 104, so the bottom part of the left side 104a of the plast tank 104 has a slope at the bottom. So that it reaches the suction port of the blast pump 106. The plast pump 106 pumps a slurry liquid S composed of the liquid and abrasive grains in the plast tank 104 to eight process guns 105 through pipelines. Since the blast pump 106 pressurizes the slurry liquid S, wear due to friction with abrasive grains cannot be avoided. Therefore, a special pump that is resistant to wear is used.

The slurry liquid S pressurized by the blast pump 106 reaches each process gun 105 through a pipeline. Compressed air is supplied to the process gun 105 from a compressor (not shown). The high-pressure slurry liquid S is projected from each process gun 105 toward the tumbler 1 disposed opposite to the process gun 105 by the compressed air, and the plate-like work inside the tumbler 1 is surface-treated.

The tumbler 1 has a thick layer of an elastic body formed inside. As the elastic material layer, various rubbers are used in which a carbide such as boron force-silica carbide or a nitride such as silicon nitride / titanium nitride is kneaded with urethane rubber or the like. Also, on the inner side and bottom of the tumbler 1, projections for reversing the plate-like work are provided. It is formed in a row or a ridge. These projections are also formed from the elastic body. Further, the bottom surface of the tumbler 1 is formed in a conical shape in which the center of rotation is convex so that the plate-like work is easily inverted. Since the tumbler 1 has a large number of holes, the slurry liquid S projected on the tumbler 1 falls into the chambers 101 and 102 from these holes, and the left side of the blast tank 104 Collected in part 104 a.

In the right side 104 b of the plast tank 104, a low-concentration liquid containing a small amount of abrasive grains of the slurry one liquid S is stored. This liquid is supplied to cyclone 109 by primary washing pump 108. In the cyclone 109, abrasive grains and water are separated by utilizing the difference in their specific gravities, and the water is used as primary washing water or shower water in the apparatus.

Reference numeral 110 denotes a sludge collection device that periodically circulates the slurry liquid, sediments the worn or crushed abrasive particles having a reduced particle size into a collection tower, and accumulates them in a tank. After that, the slurry is put into a cylindrical densitometer, and the sedimented alumina abrasive grains are measured and expressed in volume%. When this numerical value becomes thinner than the specified numerical value, the alumina abrasive is supplied by a rising type quantitative feeder. Grains are replenished.

FIG. 2 is a view showing one of the tumblers 1 of FIG. 1 taken out. FIG. 2 (a) is a perspective view of the tumbler 1, and FIG. 2 (b) is a view of the bottom surface lb from the opening la side of the tumbler 1. The hatched part in (a) is the space where most of the plurality of plate-like works 2 put into the tumbler 1 exist. This space is referred to as the work space V here. This work space V is not fixed, but moves slightly due to the rotation of the tumbler 1. That is, when the tumbler 1 is stopped, this work space V is almost the lowest point of the tumbler 1, but as shown in FIG. 2 (b), when the tumbler 1 rotates in the direction of the arrow, the work space V Also moves slightly upward from the position just below the tumbler 1 in the rotational direction, and moves to an inclined position.

In order for the inner plate-like work 2 to be rolled and uniformly stirred by the rotation of the tumbler 1, the space of ① ゃ ② is required as described in FIG. In other words, it is important how large the work space V is. In the embodiment of the present invention, the tumbler 1 has a diameter 1a of 250 to 50 mm 0 mm and a height from the opening 1 a to the bottom 1 b of 200 mm to 400 mm. The plate-like work 2 having an area of 50 to 100 cm ^{2 on} one side is charged so as to occupy a volume of about 5 liters. As described with reference to FIG. 1, two process guns 105 and 105 are provided for one tumbler 1. The tumbler 1 has its central axis a inclined 6> with respect to the horizontal, and rotates at a speed of N rpm in the direction of the arrow in the inclined state. The inclination angle 6> of the central axis a was 30 ° in the example. If this angle (is small and negative, the plate-shaped work 2 will fall from the tumbler 1. This is inappropriate. On the other hand, if the angle is too large, the plate-shaped work 2 will not overlap and be overturned. When the experiment was performed in consideration of the above, it was found that the range of 0 to 60 ° was appropriate.

In the case of 0 °, the shape of the tumbler 1 is, for example, a via barrel shape, and is limited to a shape in which the plate-like work 2 does not fall.

Symbols A and B shown in FIG. 2A indicate the projection directions of the two process guns 105. Symbols A and B shown in FIG. 2 (b) indicate the projection ranges of the two process guns 105. These process guns 105 do not project the slurry liquid S in the same direction, but slightly differ.

The process gun 105 of A is moved from the obliquely upper part of the tumbler 1 so that the abrasive particles collide with the plate-like work 2 from the direction of movement of the plate-like work 2 in the range shown in A of FIG. (5) The slurry liquid S is projected into the work space V). The projection from the process gun 105 of A is the main surface treatment.

The process gun 105 in the projection direction B aims at stirring the plate-like work 2. The projection direction is almost parallel to the central axis a of the tumbler 1.A projection is made in the vicinity of the tip of the work space V in the rotation direction indicated by B in FIG. 2 (b), and is wound up along the body of the tumbler 1. The plate-like work 2 stuck to the body is peeled off with the slurry liquid S, so that the work 2 is flipped into the space. In the portion B, the plate-like work 2 has a very unstable posture, so that the complicated shape of the plate-like work 2, for example, the inner surface of the through hole and the concave portion on the side surface, can be easily processed.

FIG. 3 is a diagram showing a second embodiment of the present invention. Similar to FIG. 2, one of the tumblers 1 in FIG. 1 is taken out and shown. (A) is a perspective view of the tumbler 1, and (b) is a bottom view 1 b from the opening 1 a side of the evening tumbler 1. FIG. The hatched area in (a) is the work space V. The inclination angle between the central axis a of the tumbler 1 and the horizontal is Θ, and the tumbler 1 rotates in the direction of the arrow at a speed of N rpm. In this example, one tank Bra 1 uses four process guns 105.

A, B, C, and D shown in Fig. 3 (a) are the projection directions of the four process guns 105, and A, B, C, and D shown in Fig. 3 (b) are the respective process guns. Shows the projection range of gun 105.

The process gun 105 shown in A is laid so that it is almost parallel to the central axis a of the tumbler 1, and projects near the tip of the work space V in the rotation direction A shown in A of FIG. The plate-like work 2 which is wound up along the trunk and stuck to the trunk with the slurry liquid S is peeled off and is repelled into the space.

The D process gun 105 feeds the plate-like workpiece 2 blown by the A process gun 105 into the work space V.

B and C process guns 105 are the main parts of the plast treatment. B process gun 105 projects from the boundary between the barrel and the bottom of tumbler 1, aiming at work space V slightly above the barrel. The process gun 105 of C is located between A and B, where the process gun 105 aims at the lump of work on the body side from the boundary between the barrel and the bottom of the tumbler 1, and the plate-like work 2 is aimed at the process gun 105 of A. To be sent to

In the portions A and D, the plate-like workpiece 2 has a very unstable posture, so that the complicated shape of the plate-like workpiece 2, for example, the inner surface of the through hole and the concave portion on the side surface, can be easily processed.ο The invention's effect

As described above, according to the surface treatment apparatus for a plate-like work of the present invention, a tumbler into which a plurality of plate-like works is put and rotatable around a central axis, and abrasive grains on the plate-like work in the tumbler And a plurality of abrasive grain projecting means for projecting the same, and the projection direction of the abrasive grain projecting means can be changed independently of each other. Since the blasting process can be performed while peeling off and reversing one piece, the surface treatment on both front and back surfaces can be evenly performed in a short time. Thereafter, the back plate of the friction member is subjected to a chemical conversion treatment to form a phosphate chemical conversion film. Before and after that, a water washing treatment is performed, and these are continuously performed as a flow operation. According to the present invention, it is possible to reduce the tact time in these series of work. It has a special effect that it can be done.

In addition, if the abrasive projecting means has a process gun for ejecting a fluid, it is easy to adjust the projection direction of the abrasive. When the liquid contains a degreasing agent, the surface treatment and the degreasing treatment of the plate-like work can be performed simultaneously, which is efficient.

Claims

The scope of the claims

1. A tumbler into which a plurality of plate-shaped works are put and rotatable around a central axis, and a plurality of abrasive grain projecting means for projecting abrasive grains for plast treatment on the plate-shaped work in the evening mixer, A surface treatment apparatus for a plate-like workpiece, wherein a projection direction of the abrasive grain projection means can be independently changed.

2. A work space in which most of the plate-like work is contained is defined in the tumbler, and at least one of the abrasive projecting means projects near the end of the work space in the rotation direction. The surface treatment device for a plate-like work according to claim 1, wherein

3. The surface treatment apparatus for a plate-like work according to claim 1, wherein the plurality of abrasive grain projection units have a process gun for spraying a slurry liquid containing abrasive grains.