JPS61153028A - High frequency induction heat bonding device for brake shoe lining - Google Patents

Abstract

PURPOSE:To favorably perform the above heat bonding by forming a high frequency coil for heat bonding a lining to the outer peripheral surface of a shoe rim in such a manner as to be of double width confronting with the inner surface of the shoe rim, and providing a slit for limiting the sectional area of a current path. CONSTITUTION:A shoe body 1 comprises a rim 2 formed by a circular-arc curved plate, and a web 3 vertically fixed to the lateral center of the inner peripheral surface of the rim in the peripheral direction. A shoe lining 4 is heat sticked to the rim 2. In this case, a high frequency coil 5 for heat sticking the shoe lining 4 to the rim 2 is formed by providing a plurality of meandering portions A-D extending in the peripheral direction of the rim 2, and the respective meandering portions A-D are disposed adjacent to the shoe body 1. The space between the meandering portions A, B is set larger to prevent setoff of magnetic field and ensure magnetic flux acting on the rim 2 surface, and the space between the meandering portions B and C is set smaller to cancel magnetic flux acting on the web 3 and restrains same.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a bow-shaped brake shoe that is a basic component of a drum brake. The present invention relates to an apparatus for adhering shell lining to an outer circumferential surface, and specifically relates to an apparatus using a high-frequency induction heating method as a heating means during adhesion.

(Background of the Invention) Generally, in the manufacture of brake shoes for use in drum brakes, a sheet main body usually made of metal and a shoe lining made of organic or inorganic material molded into a predetermined shape are made of thermosetting resin. Usually, they are bonded through an adhesive coating layer, and this bonded state is maintained using a large clip, etc., and then placed in an open heating furnace for heat treatment.

However, this method not only requires large-scale heating furnace equipment, but also requires a long time for heat treatment, so there are many problems in improving productivity.

Therefore, the present inventors conducted various studies with the aim of downsizing the equipment and speeding up the heat treatment, and decided to apply the high-frequency induction heating method, which has recently been used industrially in small heating furnaces. We focused on the fact that if it were possible to do so, it would have the advantage of allowing rapid heat treatment with small equipment.

In order to apply this high-frequency induction heating method to bonding the shoe rim and lining of a brake shoe, it is necessary to devise a way to apply heat evenly to the arch-shaped bonding surface called the brake shoe. It is conceivable to arrange a high-frequency induction coil close to the entire surface along the inner surface, but for example, the shoe rim is generally equipped with a nib, which is used for the purpose of improving the contact posture of the packing grate after the brake device is assembled. Accordingly, a protrusion toward the inner side of the rim is often provided, and this nib portion may come close to the coil, causing localized high heat.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention uses high-frequency induction heating to produce a shoe main body having a substantially T-shaped cross section consisting of a rim and a web, and a shoe lining that engages with the outer peripheral surface of the rim. It is an object of the present invention to provide an apparatus for suitably heat bonding.

(Summary of the invention) As is well known, high-frequency induction heating uses an alternating magnetic field generated by high-frequency alternating current to directly heat a conductor. It is essential to prevent the shoe lining from peeling off by uniformly and reliably adhering it over the entire length of the shoe lining.For this reason, in the present invention, the lining has a special shape and structure. The formed high-frequency induction heating coil (hereinafter referred to as high-frequency coil) is placed in a predetermined positional relationship with respect to the main body of the Plexigny shoe, so that the alternating magnetic field is uniformly applied to the entire surface of the rim. be.

The gist of the device of the present invention, which has been made to achieve the above object, is that a lining is brought into contact with the outer peripheral surface of the shoe rim via an adhesive, and a high-frequency induction coil is placed facing the inner surface of the shoe rim. The bonding device heats and adheres the shoe rim by applying electricity to the shoe rim. It is characterized in that it is provided at a plurality of locations spaced apart from each other.

(Example of the invention) The present invention will be explained in detail below based on the drawings.

FIG. 1 shows the shoe body 1 and the shoe lining 4 before adhesion. It consists of a web 3 fixed vertically along the length. Note that 2′
is a nib. These are bonded together with an adhesive layer of thermosetting resin interposed between the outer peripheral surface of the rim 2 and the inner peripheral surface of the shoe lining 4.

In this case, the separation of the shoe lining 4 from the rim 2 is
To prevent this, it is necessary to heat the adhesive layer uniformly over the entire surface, and at the same time, it is also important that the contacting surfaces of the rim and shoe lining be in a uniformly pressurized state. For this reason, it is necessary to heat only the adhesive surface, avoiding the mechanism for pressurizing and engaging the two. In the high frequency coil 5 shown in FIG. 2, A extending along the rim circumferential direction,
B.

The CSD has a meandering portion, and these four meandering portions are arranged in close proximity to the shoe main body 1 in the relationship shown in FIG. 3(A). This is because it is better to suppress heat generation in the web while concentrating heat generation on the entire surface of the rim, and between curved sections A and B (see Figure 3 (b)), the direction of the current is opposite. By taking a sufficient interval GAII (or Gco), canceling of the magnetic field is prevented and magnetic flux acting on the rim surface is secured, while curved portions B and C (see Fig. 3 r-)
The magnetic flux acting on the web is canceled out and suppressed by making the current direction opposite and making the interval GBC small. In addition, when adhering sea linings to two or more plastic shoes, arrange the sear bodies in parallel and attach A and/or D in FIG. In other words, for a plurality of parallel shoe bodies, curved portions B and C facing each rim inner circumferential surface are arranged, and further for the shoe bodies at the inner and outer positions. Arrange A and D on the outside, and as a whole, AlB, C, B,...C,
B. May be used as CSD. Further, the interval GAI,
When the high-frequency coil is a tube or wire, GcD is often set to about 5 to 6 times the diameter of the high-frequency coil, and the gap between the web and the rim of B (or C) is 1 of the web thickness. It is preferable that the thickness be about .7 to 2 times, the latter being about the same as the rim plate thickness.

Fig. 4 shows a mechanism for uniformly pressurizing and engaging the entire surfaces of the shoe body 1 and the shoe lining 4 in the shoe lining bonding device. - arranged in an arc shape so as to have an inner surface matching the outer peripheral shape of the lining 4;
Both ends of the longitudinal direction are fixed positioning members 11.11
In addition, in this example, three width direction positioning casings 12, 12, and 12 are arranged in the middle of the longitudinal direction.

The support made of an elastic body has a sea lining 4 placed on the inner peripheral surface of the stand 11 with a Teflon sheet 14 interposed therebetween, and a sheet main body 1 with adhesive applied to the outer peripheral surface of the rim. It will be placed. The Teflon sheet 14 is for facilitating peeling after heat treatment.

Then, by engaging the clamp arms 15.15 with both ends of the web 3 of the shoe main body 1 placed as described above and pressing down from both sides, the receiver uses the elasticity of the base 10 to attach the shoe lining 4. A uniform pressurized state (usually about 7 Kf/i or more) is obtained between the rim 20 and the rim 20 over the entire surface.

The clamp arms 15.15 are provided in the shape of a bell crank as shown in the figure, and their lower ends are connected via an air (or hydraulic) cylinder device 16, and when the air cylinder device 16 is extended, the above-mentioned seal The force to press down the main body is obtained by fitting the piston rod 17 of the air cylinder device 16 into the friction block 18, which causes one of the pair of clamp arms to press down.

(the right side in the figure) is provided so that it swings initially, and then both swing when the push-down blade is activated, thereby preventing large positional deviations between the respective shoe bodies.

Further, as shown in FIGS. 6 and 7, the positioning housing 12 in the width direction is prevented from shifting in the width direction by a protrusion 19 that substantially makes point contact with the side surface of the shoe lining 4 and the rim 2. This is intended to minimize heat loss due to conduction during heat treatment and to achieve uniform heating throughout.

A high-frequency coil 20 of a predetermined shape is inserted into the rim 2 from above the shoe body 1 and the shoe lining 4, which are held in a uniform pressurized state as described above.
It is arranged so as to face the inner peripheral surface. FIG. 5 shows the operation of arranging the high-frequency coils 20 facing each other. In this example, the high-frequency power source 21 and the high-frequency coil 20 are assembled to the lower end of the rod 23 of the vertically moving air cylinder device 22, and the air (
The high frequency coil 20 is moved downward by driving the cylinder device 22 (or hydraulic pressure) so as to face the inner circumferential surface of the rim.

6 and 8 show a state in which the high frequency coil 20 is thus opposed to the inner peripheral surface of the rim of the shoe body 1, but in this example, the shoe body is The case where two pieces are arranged in parallel and heated is shown.

The wide glue-shaped coil is provided with slits at a position facing the nib 2' and at other positions as shown in FIG. 8 to restrict the current path, and a protrusion or the like normally formed on the rim of the shoe body 1 is provided. The rim is made to be locally heated to a high temperature, thereby ensuring uniform heating over the entire rim.

As described above, one
By applying high frequency alternating current of kHz or higher, the rim 2
is heated by induction, and the thermosetting resin used as the adhesive undergoes a polymerization reaction, usually in a period of about several tens of seconds. After heating,
After maintaining the pressurized state for a predetermined period of time, the pressurization may be released and the sample may be taken out.

According to the above-described heat treatment, it is possible to bond the shoe lining extremely quickly, and the pressurized state can also be ensured and easily maintained, resulting in good workability.

(Modifications and Effects) The present invention is not limited to the above-described embodiments, but can also treat a large number of plexiform islands at the same time, for example, by increasing the curved portion of the high-frequency coil in a continuous meandering manner, as shown in FIG. Alternatively, a cooling device may be attached to the high-frequency coil, or the high-frequency coil itself may be used as an independent device to allow cooling water to flow inside.

In order to heat the entire shoe rim evenly, slits that partially restrict the current path are preferably provided alternately in the longitudinal direction of the coil.Furthermore, even if the shoe rim does not have a nib 2', it can be heated evenly. It is effective for

(Effects of the Invention) According to the present invention, compared to the heat treatment for bonding shoe lining using a conventional open-type heating furnace, the work can be done extremely quickly, resulting in a dramatic improvement in productivity. In addition to being smaller in terms of equipment, the efficiency of energy use for heat treatment is improved, and uniform heating is achieved, resulting in lower costs.

The benefits are also significant in terms of improved product quality.

[Brief explanation of the drawing]

Drawings 1 to 9 are for explaining the present invention in detail, and FIG. 1 is a perspective view showing the state before the brake shoe is bonded, and FIG. 2 is a perspective view showing the shape of the high-frequency coil. Figures 3(a), 3(b) and fl are diagrams showing the arrangement relationship between the high frequency coil and the main body of the plexiform shoe. 4 to 8 are for specifically explaining one embodiment of the device of the present invention. FIG. 4 is a schematic diagram of the pressurizing device, and FIG. Diagram to explain,
FIG. 6 is a longitudinal sectional view showing the relationship between the high frequency coil and the positioned shoe main body, FIG. 7 is a view showing the shape of the protrusion for positioning in the width direction, and FIG. 8 is a plan view of FIG. 6. FIG. 9 is a diagram showing another example of the high frequency coil. 1... Shoe body 2... Rim 2'... Nib 3... Web 4... Shoe lining 5... High frequency coil 10... Support is stand
11... Positioning member 12... Width direction positioning casing 14... Teflon sheet 15... Clamp arm 16... Air cylinder device 17... Piston rod 18... Friction material block 19... Protrusion 20...High frequency coil 2
1... High frequency power supply 22... Air cylinder device 23... Rod. Figure 2 A6CD (A) Figure 3 Figure 4 Sube', 1'z D Country Figure 6 "GO0-81iffΣ1, ゛:9 Figure

Claims (4)

[Claims] (1) A bonding device that heats and adheres the shoe rim by applying electricity to a high-frequency induction coil that abuts the lining on the outer peripheral surface of the shoe rim via an adhesive and is arranged opposite to the inner surface of the shoe rim, the above-mentioned high-frequency A high-frequency induction heating type brake shoe lining characterized in that the induction coil is provided in a wide shape facing the inner surface of the shoe rim, and slits that limit the cross-sectional area of the current path are provided at multiple positions spaced apart in the lengthwise direction of the coil. Gluing device. (2) The high-frequency induction heating bonding device for brake shoe linings as set forth in claim (1), wherein the high-frequency induction coil is folded back in the longitudinal direction with a shoe web in between. (3) The slits formed from the width edges of the coil are formed alternately from both width edges in the longitudinal direction of the coil.
) A high-frequency induction heating type bonding device for brake shoe linings as described in item ). (4) The high frequency brake shoe lining according to any one of claims (1) to (3), wherein the slit is formed facing at least the nib portion of the shoe rim. Induction heating type bonding device.