JPH0780404A - Coating of sound silencing material for spring - Google Patents

Abstract

PURPOSE:To reduce the number of various types of dedicated devices for coating, and thermal energy and manhours by utilizing the residual heat of hardening after forming in a specified spring shape and hardening a wire rod, and coating a sound silencing material of a synthetic resin on the specified spot of spring. CONSTITUTION:When coating a spring, for example, an S spring for an automotive seat with a sound siliencing material, first, S springs 1A arranged side by side on the supply table 61 of a supply chute 6, are held by a robot hand 7, supplied to an electrode 3 for energization and hardened. Next, both end parts 11 of the hardened S spring 1B are dipped alternately into a dipping tank 4 for the sound silencing material 2 filled with synthetic resin powder or liquid to coat both end parts 11 with the sound silencing material 2. After that, the coated S spring 1C is supplied to a cooling device 5 and cooled. In this case, the cooling device 5 is equipped with hooks 54 for picking up the S spring 1C, attached to a chain passing on an upper and a lower sprocket 51, 52. Finally, the S spring 1C is stored in order into a storage case 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a sound absorbing material on a spring made of a linear material such as an S-shaped spring, a compression coil spring and a formed wire, which is used for automobile seats.

[0002]

2. Description of the Related Art For example, in an S-shaped spring for an automobile, both ends thereof are attached to a frame of a seat by clamps or the like, and both ends of the S-shaped spring are made of polypropylene or the like for preventing abnormal noise. A cylindrical silencer made of a resin material is fitted. Similarly, a cylindrical silencer is also fitted to the compression coil spring of the seat and the connection portion of the formed wire with other springs to prevent abnormal noise. The one in which the cylindrical silencer is fitted to the abnormal noise portion of the spring has a problem that it takes a lot of time to fit the silencer to the spring.

In order to eliminate such a problem, there is a method of coating the spring with a powder or liquid synthetic resin material by welding or the like. In this method, quenching is performed to improve the hardness of the spring, and after the quenching is completed, the finished spring is housed in a heating furnace to heat the spring, and then the whole spring is a powder tank of synthetic resin material, or It is soaked in a liquid tank to fix a sound deadening material made of a synthetic resin coating on the entire spring and then dried.

[0004]

Therefore, according to this coating method, since the spring has to be heated and dried for coating, it requires a lot of man-hours for coating and a coating apparatus must be installed. There was a problem I had to make. Therefore, an object of the present invention is to make it possible to easily coat a spring by using a conventional spring quenching device.

[0005]

According to the present invention for achieving the above object, a wire rod is formed into a predetermined spring shape (for example, a continuous S shape) and hardened, and then the spring is heated by the residual heat of the hardening. Predetermined location (eg S-shaped spring end)
It is characterized by being coated with a synthetic resin sound deadening material. The above-mentioned synthetic resin sound deadening material is powder or liquid such as polypropylene.

[0006]

The container for accommodating the sound absorbing material made of synthetic resin is installed between the conventional quenching device and the cooling device for cooling the spring after quenching, and the quenched spring is immersed in the container for quenching. With the residual heat, a sound deadening material is attached to a predetermined portion of the spring, and the sound deadening material is attached to the spring integrally with the spring by passing the spring with the sound deadening material attached thereto through a cooling device, and at the same time, quenching of the spring is completed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an S-shaped spring for a vehicle seat (1).
This S-shaped spring (1) has two ends (11) (11)
Is attached to a frame (not shown) of the seat, and both ends (11) (11) of the sheet are coated with the synthetic resin silencer (2) (2) by the method of the present invention. In the figure, (81) and (81) are storage boxes (8) for storing (1) in alignment with the S-shaped spring coated with the sound deadening material (2) of FIG.
Shows a standing piece.

FIG. 2 shows a quenching device for an S-shaped spring (1) for carrying out the method of the present invention. The S-shaped spring (1A) formed by forming a wire into an S shape by a forming machine has a supply chute (6).
A large number of them are arranged in parallel on the supply table (61). This S
The shaped spring (1A) is moved by the robot hand (7).
At the position, the center is clamped as shown by the chain line in FIG.

After that, as shown in the position of the energizing electrode (3) for hardening by the robot hand (7), a magnet is provided on the energizing electrode (3) to be fed,
With this magnet, the S-shaped spring (1A) is positioned at a predetermined position, and is energized to quench it. In the figure, (3
1) indicates a transformer.

After quenching, the robot hand (7) is operated to put the S-shaped spring (1B) after quenching into the immersion tank (4) of the sound deadening material (2) made of synthetic resin powder or liquid. The ends (11) (11) of the shaped spring (1B) are immersed as shown alternately. At this time, since the S-shaped spring (1B) is heated by the residual heat at the time of quenching, the silencers (2) are coated on the terminals (11) and (11) of the S-shaped spring (1B).

After the coating is completed, the robot hand (7) is operated as shown by to send the S-shaped spring (1C) after the coating to the conventional cooling device (5). This cooling device cools the S-shaped spring (1C) at room temperature, and the upper and lower sprockets (51) (52).
A chain (53) is wound around the chain, and a large number of hooks (54) (54) are attached to the chain (53), which are arranged on the left and right at intervals. Robot hand (7) on hook (54) of (53)
The S-shaped spring (1C) is hooked by and is naturally cooled during transportation, so that the coated S-shaped spring (1C) after quenching is cooled, and the coated part of the sound deadening material (2) is dried. At the same time, the quenched S-shaped spring (1C) is cooled. After cooling by the cooling device (5), the S-shaped springs (1) are aligned and housed in the housing box (8).

[0012]

According to the method of the present invention, the conventional quenching apparatus can be coated with the sound deadening material at a predetermined portion such as the end of the spring only by providing the synthetic resin containing tank for coating the sound deadening material. Therefore, a heating device, a cooling device, etc. dedicated to coating are unnecessary, and thermal energy and man-hours for coating can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view of a spring coated by the method of the present invention.

FIG. 2 is an explanatory view of an apparatus for carrying out the method of the present invention.

[Explanation of symbols]

 1 spring 2 silencer

Claims (1)

[Claims] 1. A method of coating a sound deadening material on a spring, which comprises forming a wire into a predetermined spring shape, quenching the wire, and then applying a residual heat from the hardening to coat a predetermined portion of the spring with a sound deadening material made of synthetic resin. .