JPS5823588A - Method and device for frictional press-contacting - Google Patents

Abstract

PURPOSE:To melt-stick a melt-sticking member and a member to be melt-sticked uniformly without melt-sticking defects, by press-contacting and rotating them automatically while changing pressure in case of the frictional melt-sticking between thermoplastic resin members. CONSTITUTION:A rotary cylinder 1 incorporating a rotation shaft 19 is connected to a rod 24 of an air cylinder 23, and a thermoplastic resin member 21 to be frictionally melt-sticked is attached to the tip of the rotation shaft 19. High-pressure air is supplied to the air cylinder 23 to allow the rod 24 to fall, and the melt-sticking member 21 at the tip of the rotation shaft 19 is pressed to a member to be melt-sticked. Next, low-pressure air is supplied to the air cylinder 23 to bring both members into contact with each other with a proper pressure, and the melt-sticking member 21 is rotated by the rotation of a motor 8 to soften frictionally both members to be melt-sticked to each other. The rotation of the motor 8 is stopped, and air supplied to the air cylinder 23 is switched to high-pressure air to press both members to each other strongly, thus press-fixing them. This operation is performed by an automatic switching operation to form a melt-sticking part having a uniform and excellent quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction welding method and apparatus for friction welding members made of thermoplastic resin.

Spin welding is a method used to attach welding parts, such as a level sensor or a hose connection port, to parts made of thermoplastic resin, such as gasoline tanks or windshield washer tanks. In the spin welding method, the pressure welding force during friction welding is constant from beginning to end, so if the bonding surface of the tank, which is the part to be welded, and the bonding surface of the welding part are not parallel, partial bonding may occur. As a result, the entire surface of the welding member to be welded is not uniformly welded to the welded member, resulting in poor welding. Also, make sure that the entire surface of the welding member is adhered to the welded member.
The above drawbacks can be overcome by increasing the contact pressure, but in this case, as the welding member melts, it bites into the welded member more than necessary, sometimes weakening the strength of the welded member.

The present invention achieves uniform welding by switching the contact pressure between the welded member and the welded member made of thermoplastic resin in three stages: high pressure → low pressure → high pressure, and prevents excessive digging of the welded parts to improve reliability and The object of the present invention is to provide an apparatus using the friction welding method, which enables the production of high-quality products.

Embodiments of the present invention will be described below based on the drawings. First, the configuration of a friction welding machine will be explained based on FIG. A pulley 4, a brake unit 5, a gear 6, and a cam 7 are fixed to the rotary cylinder 1. A KV belt 11 is installed between the pulley 4 and the drive pulley 10, and the drive pulley 10 is fixed to a rotating shaft of a transmission 90 that changes the speed of the driving force from the motor 8. Further, a gear 13 attached to a rotating shaft 12 is meshed with the gear 6. A cam 14 is fixed to this rotating shaft 12. 15 is a brake control sensor operated by this cam 14, and 017 is a bearing for the rotating shaft 12, which is mounted on a mounting base 16 whose fixed position can be changed. A motor control sensor 18 is provided near the cam 7 and is operated by the rotation of the cam 70. Reference numeral 19 denotes a rotating shaft inserted into the rotary cylinder 1. This rotating shaft 19 is rotated along with the rotating cylinder l by a key 20 provided in the axial direction, but in the axial direction, It is provided slidably with respect to the rotating cylinder IK, and furthermore, at the lower end of this rotating shaft 19,
A chuck 22 for holding the welding member 21 is attached, and an air cylinder 23 is attached to the upper end of the rotating shaft 19.
The rods 24 are connected to each other. 25 is a high pressure side solenoid valve,
26 is a low pressure side solenoid valve, and the high pressure side solenoid valve 25 is supplied with air from an air source 27 via a high pressure side pressure regulating valve 28, and the low pressure side solenoid valve 26 is supplied with air from an air source 27.
The air from the solenoid valves 25 and 26 is supplied through the low-pressure side pressure regulating valve 29, and the output from the solenoid valves 25 and 26 is used as a driving source for the air cylinder 23.

The above is the mechanism of the device according to this embodiment. The electrical circuit for operating the mechanism is shown in FIG. 3 is a start switch, 34 is a pressure welding time setting timer, 35 is a spin start timer, 36 is a spin timer, 37 is a forward/reverse switch for the motor 8.
B indicates a member to be welded.

Next, to explain its function, first, selector switch 3
2 to automatic and then press the start switch 33, the timer 34 starts automatically and the high pressure side solenoid valve 25 is activated by the signal.
As a result, high pressure air is supplied into the air cylinder 23, and the air cylinder 230 rod 24 descends. Along with this, the rotating shaft 19 also descends, and the welding member attached to the lower end of the rotating shaft 19 21 is pressed against the welded member 38 under high pressure as shown in FIG. 4(b). Next, the timer 36 is activated by a signal from the timer 35, and at the same time the motor 8 is driven by the signal, the low pressure side solenoid valve 26 is opened. 25 is closed, and the pressure inside the air cylinder 23 is switched to low pressure. Therefore, the rotational force of the motor 8 is transmitted to the rotating shaft 19 via the transmission 9 and the rotating cylinder 1.
is rotated, and due to the pressure of the air cylinder 23, that is, low pressure, the welding member 21 attached to the lower end of the rotating shaft 190 is welded to the welded member 384 as shown in FIG.
Frictionally rotates while in contact with C. Next, when the time set in the timer 36 has elapsed, the motor control sensor 18 enters the detection state due to the open circuit signal from the timer 36, and when the motor control sensor 18 is pushed by the cam 7, the motor control sensor 18 enters the detection state. 18 generates a signal, which operates the forward/reverse switch 37 and supplies current to the motor 8 to reverse the motor 8, thereby applying braking to the motor 8. At the same time, the brake control sensor 15 enters the detection state in response to a signal from the motor control sensor 18. In addition, the rotational force of the rotating tube 1 is
Brake control cam 14 via gears 6 and 13
When the brake control cam 14-t' and brake control sensor 15 are pressed, the brake control sensor 15 activates and issues a signal, and this signal activates the brake unit 5.
The rotating cylinder 1 and rotating shaft 19 stop immediately. At the same time, the rotation of the motor 8 is also stopped.
6, the low-pressure side solenoid valve 26 is closed and the high-pressure side solenoid valve 25 is operated, and the inside of the cylinder 23 is switched to the high pressure set by the high-pressure side pressure regulating valve 28, and the welding member 21 is welded to the welded member 38 with high pressure as shown in FIG. Rod 2 of air cylinder 23 with a signal
4 moves back, and the whole thing is returned to its old position.

The time from when the motor 8 is braked until the brake unit 5 is activated can be stopped by adjusting the position of the brake control sensor 15. Further, the durability of the motor control sensor 18 and the cam 7 and the brake control sensor 15 and the cam 14 can be improved if a non-contact type (phototransistor or the like) is used. It goes without saying that the pressure of the low-pressure side regulating valve 29 is adjusted in advance to a pressure that does not cause the welding member to sink into the welded member during welding or to prevent it from being pushed back.

IN! In this example, motor control sensor 18
Although the motor control sensor 18 has been described as one that detects the rotational position of the rotary cylinder 1, the motor control sensor 18 may also be configured to detect the rotational position of the rotation shaft 12.

As described above, the present invention rotates by driving the drive member 8, and slides the rotating shaft 19 in the axial direction on the other end of the rotating shaft 19 to which the welding member 21 is fixed to one end. A pressure cylinder 23 is provided for bringing the welding member 21 into contact with and separating it from the welded member 38, and the operating pressure within the pressure cylinder 23 is varied so that the contact pressure between the welding member 21 and the welded member 38 changes from the initial high pressure. The friction welding method is characterized in that the pressure is switched to low pressure at the start of the rotation of the rotation shaft 190, and then immediately switched to high pressure after the rotation of the rotation shaft 19 is stopped, and the rotation is performed by driving the drive member 8, and one end Welding member 21 to
A pressure cylinder 23 is provided at the other end of the rotating shaft 19 to which the rotating shaft 19 is fixed, and the pressure cylinder 23 slides the rotating shaft 19 in the axial direction to bring the welding member 21 into contact with and separating from the welded member 38.
This is a friction welding device in which an operating pressure supply mechanism whose operating pressure is switched between high and low pressure is connected to the welding member 21 and the contact pressure between the two is switched while the welding member 21 is being welded to the welded member 38. According to this invention, uniform welding can be performed by changing the contact pressure between the welding member and the welded member into three stages: high pressure → low pressure → high pressure. That is, in the pressure welding process in which the main shaft does not rotate and in the cooling process after welding, it is possible to apply a high pressure welding force so that the welding surfaces of both the welding part and the welded part are evenly parallel to achieve uniform welding. , in the welding process in which the main shaft rotates, no more pressure than necessary is applied, so it is possible to effectively prevent the welded parts from digging in. Therefore, the welding surfaces of the welded parts and the welded parts are parallel to each other. Good welding can be achieved even if the pressure is not high, and even if there are variations in the distance between the two members or the thickness of the welded members, friction welding can always be performed with a constant pressure.

Furthermore, since the braking force of the motor itself is used as a means to stop the rotating shaft in a friction welding machine, it is different from the conventional mechanism that uses a clutch to separate the Tanabata shaft from the rotating shaft. This has the effect of simplifying the configuration. Furthermore, according to the present invention, the crimping material can be stopped from a constant rotation within one rotation, so that the crimping material at -t is completely stopped before the crimping material and the material to be crimped are cooled, so that both This has the effect that the welding of the materials is completed and a product with excellent welding strength can be obtained.

[Brief explanation of the drawing]

The drawings all show embodiments of the device according to the present invention, and FIG. 1 is a mechanical explanatory diagram showing the entire device, FIG. 2 is an operational circuit diagram of the same device, and FIG. 3 is an operational process diagram of the same device. , 4th
Figures (a), (b), f), and (b) are explanatory diagrams showing the operating modes of the crimping material and the material to be crimped, and Figure 5 shows the relationship between the motor rotation speed and time when the main shaft is stopped. Characteristic diagram of Ol... Rotating cylinder 2.3... Bearing 4...
・Pulley 5...Brake unit 6...
Gear 7...Cam 8...Motor
9...Transmission 10...Drive pulley 11...
V-belt 12...rotating shaft 13...gear 14
...Cam 15...Brake control sensor 1
6...Mounting base 17...Bearing 18...Motor control sensor 19...lE] Rolling shaft 20.
...Key 21...Welding member 22...Chuck 23...Air cylinder 24...Rod
25...High pressure side solenoid valve 26...Low pressure side solenoid valve 27...Air source 28...High pressure side pressure regulating valve 2
9...Low pressure side pressure regulating valve 31...Power switch 3
2... Selector switch 33... Start switch 3
4...Timer 35...Spin start timer 36
...Spin timer 37...Forward/reverse switch 38.
...Parts to be welded.

Claims (1)

[Claims] 1. A mosquito rotating shaft (to) is attached in the axial direction to the other end of the rotating shaft (2) which rotates due to the drive of the driving member (8) and to which the welding member (c) is fixed to one end. A pressure cylinder (2) is provided that slides the welding member (c) toward and away from the welded member (38), and the operating pressure in the pressure cylinder () changes to cause the welding member (c) to move toward and away from the welding member (c). The contact pressure between and the welded part line 38) is
A friction welding method characterized in that the initial high pressure changes to a high pressure as soon as the rotation of the rotating shaft (A) starts, and then immediately switches to a high pressure after the rotation of the rotating shaft (A) stops. . 2. The welding is performed by sliding the rotating shaft (to) one end in the axial direction onto the other end of the rotating shaft (2), which is rotated by the driving of the driving member (8) and to which the welding member Q is fixed to one end. A pressure cylinder for bringing the member (c) into contact with and separating from the member to be welded (38) is provided, and an operating pressure supply mechanism for switching the operating pressure between high and low pressures is connected to the pressure cylinder arm, and the welding member (2) A friction welding device in which the contact pressure between the welded member (38) and the welded member (38) is switched during pressure welding.