KR890004908B1 - High-frequency induction heat bonding device for brake shoe lining - Google Patents

Abstract

By a high frequency induction heating type joining appts. for a brake shoe lining, each lining (4) is abutted against each of the outer circubferental surfaces of juxtaposed shoe rims (2) with an adhesive between them and an electric current is passed to a high frequency induction coil (5) having turned sections to join each lining to each rim. The coil has turned sections positioned outside the opposite sides of the juxtaposed rims.

Description

High Frequency Induction Heating Bonding Device of Brake Shoe Lining

1 to 3 are diagrams for explaining the outline of the method according to the present invention, and FIG. 1 is a perspective view showing a state before bonding the lining to the brake shoe.

2 is a perspective view showing the shape of the high frequency coil.

3 (a) and 3 (b) and 3 (c) show the arrangement positions of the coils with respect to the shoe body of the brake shoe.

5 to 10 are views for explaining the first embodiment of the present invention, Figure 5 is a view showing a pressing device.

6 is a view for explaining the opposing operation situation of the high frequency coil.

7 is a longitudinal sectional view showing the relationship between the high frequency coil and the positioned shoe body;

8 is a view showing the projection shape of the widthwise positioning.

9 is a plan view of FIG.

10 shows a modification of the high frequency coil.

FIG. 11 is a diagram showing a shoe body relationship in which two shoes are arranged in parallel with a high frequency coil;

12 is a plan view of FIG.

13 is a view of another modification of the high frequency coil.

＊ Explanation of symbols on main parts of drawing

1: shoe body 2: rim

3: web 4: shoe lining

5: high frequency coil 10: shoe base

11: positioning member 12: widthwise positioning member

14 teflon sheet 15 clamp arm

16: hydraulic or air cylinder device 17: piston rod

18: friction block 19: protrusion

20: high frequency coil 21: high frequency power

24: slit

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for fixing shoe shoe lining to an outer circumferential surface of a shoe body and a rim of a shoe body, in which an arch-shaped brake shoe is a basic part of a drum brake, in which a rim and a web are fixed in a T-shaped cross section. The present invention relates to a high frequency induction heating type adhesive apparatus for bonding a shoe lining to a shoe.

In general, in the manufacture of brake shoes for drum brakes, a shoe body of a normal metal product and a shoe lining formed of a predetermined shape of an organic or inorganic material are bonded to each other via an adhesive coating layer of a connecting resin. The heat treatment is usually performed in the open heat treatment while the bonded state is maintained by a large clip or the like.

However, this method has a problem that not only a large heat treatment furnace is required, but also requires a long time for the heat treatment, so that there are many difficulties in improving productivity.

Therefore, the present inventors have made various studies for the purpose of miniaturizing equipment and speeding up the heat treatment, and recently, by applying the high frequency induction heating method which is industrially used in a small heating furnace, it is possible to rapidly heat the small equipment. The present invention has been conceived.

In order to apply the high frequency induction heating method to the bonding of the rim and the lining of the brake shoe, it is necessary to uniformly heat the arcuate joint surface of the brake shoe, and the high frequency induction coil is disposed over the entire surface along the inner surface of the shoe rim. However, in order to maintain good contact between the backing and the shoe rim after assembly of the brake arrangement, the shoe rim is generally equipped with a nib with an inward projection. As a result, this nib portion may generate local high heat in close proximity to the high frequency coil.

In order to apply the brake shoe lining properly by such a high frequency induction heating method, an adhesive device must be arranged so as to achieve a uniform heating effect on an object having a special shape called a brake shoe. It should be arranged to allow good heat treatment. Therefore, a main object of the present invention is to provide a high frequency induction heating bonding apparatus of a brake shoe lining which can sufficiently solve these problems in bonding the brake shoe lining.

As is well known, the high frequency induction heating method directly heats a conductor by using an alternating magnetic field generated by high frequency alternating current. When using this method for adhering the shoe lining to the brake shoe, it is necessary to adhere uniformly and reliably over the entire surface of the lining to prevent peeling of the shoe lining. To this end, in the apparatus according to the present invention, The structural wave induction heating coil (hereinafter, abbreviated as “high frequency coil”) is formed in a predetermined shape and positioned at a predetermined position with respect to the shoe body of the brake shoe so that the alternating magnetic field can be uniformly applied to the existence surface of the brake shoe rim. I am placing it.

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

1 shows the shoe main body 1 and shoe lining 4 before bonding, and the shoe main body 1 has a rim 2 consisting of an arcuate curved plate and a widthwise center along the inner circumferential surface of the rim 2. It consists of a web (3) fixed perpendicular to the. The rim 2 has a nib 2 '. And these are adhere | attached through the adhesive bond layer of the thermosetting resin inserted between the outer peripheral surface of the rim 2 and the inner peripheral surface of the shoe lining 4.

In these adhesion | attachment, in order to prevent the shoe lining 4 from peeling from the rim 2, it is necessary to heat the adhesive agent whole surface between them uniformly. In addition, in order to uniformly heat the contact surfaces of the rim 2 and the shoe lining 4, it is necessary to install a pressing mechanism that maintains both of them in a uniform pressing state with respect to each other. The heat treatment is achieved by the high frequency coil 5 formed, for example, adjacently adjacent to the inner circumferential surface of the rim 2 and extending zigzag as shown in FIG. In Fig. 2, the high frequency coil 5 is provided with curved portions A, B, C and D extending along the circumferential direction of the rim 2, and these four curved portions are arranged in the third (a). As shown in Fig. 1, it should be arranged to face the shoe main body 1 oppositely. This is because it is better to concentrate the heat generation on the entire surface of the rim and to suppress the heat generation of the web. In the curved portions A and B, currents reverse to each other flow, but it is better to suppress the heat generation of the web. In the curved portions A and B, currents in the opposite directions flow, but as shown in FIG. 3 (b), the gaps G _AB or G _CD are sufficiently separated from each other. The magnetic fields are prevented from canceling each other, and the magnetic flux acting on the rim 2 surface is sufficiently secured. On the other hand, as shown in FIG. 3 (c), the space G _BC is shortly spaced between the curved portions B and C, and the magnetic flux acting on the web by flowing the direction of the current in the reverse direction. Are controlled by canceling each other out. However, when the shoe lining is bonded to two or more brake shoes, the shoe bodies are arranged in parallel with each other, and the curved portion A and / or the curved portion B are separated as shown in FIG. 3 (a). The inner circumferential surface of the rim 2 of the shoe main body. In other words, each inner circumferential surface of the plurality of shoe bodies arranged in parallel and the curved portions (B) (C) are disposed to face each other, and these curved portions are disposed to face the inner circumferential surfaces of the rim of the separate shoe bodies, and on the outer surface as well. As a whole, the curved portion of the high frequency coil is, for example, (A) (B) (C) (B)... (C) It is arrange | positioned in order of (B) (C) (B), and is formed in the shape as shown in FIG.

In such a batch heat treatment of a plurality of brake shoes, the voltage applied to both ends of the coil needs to be set to a high voltage, and the dielectric strength must be sufficient, but since the charging part of the coil is generally exposed, there are various problems in safety management. There is.

Therefore, in order to lower the applied voltage, the coils are divided into a plurality of coils connected in parallel to the power source. However, due to the impedance difference between these divided portions, a difference in the high frequency current flowing through these portions is generated, and the plurality of brake shoes This results in a problem that uniform heat treatment cannot be performed.

For this reason, the present invention solves such a problem by arranging these divided parallel coils in a partially twisted manner so that the high-frequency currents flowing through the parallel coils are mutually affected to achieve uniformity. In the case where the high frequency coil is made of a tube or a line, the gap G _AB is preferably arranged about 5 to 6 times the diameter of the high frequency coil and the gap G _CD is disposed to be equal to the thickness of the web plate.

5 shows an apparatus for uniformly pressing the entire surface of the shoe main body 1 and the shoe lining 4 in the shoe lining bonding apparatus. In the drawing, the receiving base 10 is made of an elastic body such as rubber. It consists of an arch shape so that it may have an inner peripheral surface which actually matches with the outer peripheral surface of the shoe lining 4. The width direction positioning member 12 is arrange | positioned at the longitudinal direction. Then, the shoe main body 1 on which the shoe lining 4 is placed on the inner circumferential surface of the receiving base 10 via the teflon sheet 14 and the adhesive is coated with the adhesive on the outer circumferential surface of the rim is formed on the shoe lining 4. Is wit on. The teflon sheet 14 is intended to facilitate the peeling operation after the heat treatment.

Then, the clamp arm 15 is engaged with both ends of the web 3 of the shoe main body 1 mounted as described above and pressed downward on both sides of the web 3 to use the elasticity of the receiving base 10. A uniform pressing state (typically about 7 kg / cm ² or more) is obtained over the entire surface between the lining 4 and the rim 2.

Moreover, the cram-arm 15 is a bell crank type, and these lower ends are connected through the hydraulic or air cylinder apparatus 16. As shown in FIG. The cylinder device 16 is arranged to obtain a force for pressing the shoe main body by the extension of the cylinder device, wherein the piston rod 17 of the cylinder device 16 is inserted into the friction block 18, a pair One side of the clamping arm (the right direction as shown in FIG. 5) which makes up the rocker is rocked first, and then it is installed so that both of them swing by the action of a pressing force. Such a device is designed to prevent excessive positional deviation of each shoe main body.

As shown in Figs. 7 and 8, the widthwise positioning member 12 is in the widthwise direction at its position by the projections 19 which are in point contact with the side surfaces of the shoe lining 4 and the rim 2 substantially. This prevents the deviating from the position, minimizes the heat loss due to heat conduction during the heat treatment, and achieves a uniform heating effect for the entire lining.

As described above, the high frequency coil 20, which maintains a uniform pressing state between the shoe main body 1 and the shoe lining 4, and forms a predetermined shape, is formed of the rim 2 from the shoe main body 1. Place it against the inner circumference. The positioning operation of the high frequency coil 20 is as shown in FIG. 6, and in this embodiment, the high frequency power source 21 is provided at the lower end of the rod 23 of the up-and-down hydraulic or air cylinder device 22. As shown in FIG. And the high frequency coil 20 are installed, and the high frequency coil 20 is moved down by the drive of the cylinder apparatus 22, and is opposed to the inner peripheral surface of a rim.

7 and 9 show a state in which the high frequency coil 20 is placed facing the inner circumferential surface of the rim of the shoe main body 1 in this way. In this case, the high frequency coil 20 is a ribbon which forms a rectangular cross-sectional shape, and is arrange | positioned so that a magnetic flux may act on the rim surface suitably.

In addition, as shown in FIG. 10, the high frequency coil 20 includes a plurality of zigzag shapes opposed to the shoe rim, and the two divided coils 20 _{1 are} arranged from the center of the coil 20 to the left and right. It is divided into (20 ₂ ) and connected in parallel to the power supply. These split coils 20 ₁ and 20 ₂ are partially twisted in this portion, as indicated by reference numeral 25 in FIG. 10.

By doing so, the high frequency currents flowing through these split coils 20 ₁ and 20 ₂ are averaged by mutually influencing mutually, and the brake shoe is placed under uniform heating conditions.

In addition, as shown in FIG. 9, the ribbon-shaped high frequency coil is provided with a slit 24 or the like appropriately to limit the current path, and a part such as a projection that is usually formed on the rim of the shoe body 1. It is possible to prevent the heating at a high temperature locally, and to obtain a uniform heating effect on the entire rim surface.

11 and 12 show still another embodiment of the present invention, in which two shoe bodies 1 are placed in parallel and subjected to heat treatment at the same time.

The present invention is not limited to the above-described embodiment, and for example, a plurality of brake shoes as shown in FIG. 13 can be heat treated simultaneously by increasing the zigzag curved portion of the high frequency coil. In another embodiment of the present invention, a high frequency coil may be formed in a pipe shape, and a cooling device for flowing cooling water inside the pipe may be provided.

In addition, in order to perform uniform heating on the entire surface of the shoe rim, slits 24 which partially restrict the current path may be alternately installed on both sides of the coil in the longitudinal direction of the coil, and the shoe rim does not have to have a nib. These slits have the advantage of being capable of uniform heating.

In FIG. 13, n brake shoes are arranged in parallel, and the high frequency coil 20 includes coil portions 20b positioned at both ends of the shoe rim facing the zigzag curved portion 20a. have. By arranging the high frequency coil as described above, the coil portion 20a facing the rim has the same condition as that of the other coil portion, that is, the correlation with the adjacent coils, so that a plurality of brake shoes can be heated under uniform heating conditions. have.

In this way, when a high frequency alternating current of 1 KHz or more is applied to the high frequency coil 20 adjacent to the rim of the brake shoe, the rim 2 is inductively heated, and the polymerization reaction of the thermosetting resin, which is an adhesive, is performed in a time of about tens of seconds. . After the heat treatment is finished, the pressure may be removed after maintaining the pressure state for a predetermined time before taking it out of the pressurizing device.

As described above, the shoe lining can be uniformly and quickly adhered to the brake shoes at the same time by simultaneously heating the plurality of brake shoes. In addition, since the brake shoe can be easily and reliably pressed, the apparatus according to the present invention also has the effect that the workability is good.

The present invention is not limited to the embodiment described above. For example, a cooling device may also be installed in the high frequency coil, and the high frequency coil itself may be piped as described above, and the coolant may be passed through therein.

According to the present invention, the heating operation can be performed very quickly compared to the heat treatment in the case of bonding the shoe lining using a conventional open-type heating furnace, so that the productivity can be dramatically improved and the equipment can be downsized. . Moreover, since the energy utilization rate for heat processing can also be improved, the practical benefit is large.

Claims (5)

A high frequency induction heating type adhesive apparatus for bonding a brake shoe lining to a rim outer circumferential surface of a brake shoe via an adhesive and adhering the lining to the rim by heat generated by energizing a high frequency induction coil. And a high frequency induction coil mounted adjacent to the high frequency induction coil. 2. The brake shoe according to claim 1, wherein a plurality of brake shoes arranged in parallel to each other are divided in a plurality of blocks, and at least two high frequency induction coils are connected in parallel to the blocks of the brake shoes, respectively, and connected in parallel as described above. High frequency induction heating bonding device of the brake shoe lining, characterized in that the high frequency induction coil is partially twisted. 2. The high frequency induction heating type adhesive apparatus for brake shoe lining according to claim 1, wherein the high frequency induction coil has a rectangular cross section and has a slit formed to restrict a cross section of the current path. 4. The high frequency induction heating bonding apparatus of claim 3, wherein the slits are alternately installed along opposite ends of the high frequency induction coil. 2. The brake shoe according to claim 1, wherein the plurality of brake shoes are arranged in parallel with each other, and the high frequency induction coil is located farther than the other end of the brake shoes, which is opposite to the rims of the brake shoes located at both ends of the parallel arrangement of the brake shoes. A high frequency induction heating type adhesive apparatus for brake shoe lining, comprising a coil unit.

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