JPS61209780A - Welding equipment for balancing machine - Google Patents

Abstract

PURPOSE:To weld a metallic piece without any deflection nor deformation on a shaft by holding with contact within a fixed pressure a propeller shaft with the descent of the upper part electrode connected to the lift device of a supporting base on a horizontally fixed rail and by welding the metallic piece with electrification by pinching with the ascent of the lower part electrode. CONSTITUTION:A supporting base 3 is supported by a pin 14 on the travel 13 fitted freely slippably to the horizontally fixed rail 1 of the above of a column. The upper part electrode E laid to a supporting arm 26 comes into contact with a shaft W with the descent of the cylinder 20 piston rod 21 of the supporting base 3 and a guide rod 24, and the pressing force thereof is held in 2-4kg by a floating device 23. A gun arm 18 is ascended by the pressurizing of a cylinder 15 and the lower part electrode E2 placing the metallic piece P on pinches the shaft W and welds the metallic piece P. The bending force of only about 2kg is applied on the shaft W and a good welding of the metallic piece P is performed without any deflection nor deformation. The safety is secured by the descent of a piston rod 35.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a welding device for a balancing machine for welding a balancing piece (metal piece) to a propeller shaft for an automobile.

(Prior Art) Automotive propeller shafts require precision in overall weight balance in order to ensure safety during high-speed rotation.

To correct the weight balance of the propeller shaft,
A balancing machine supports the propeller shaft, rotates it at high speed, and measures its eccentricity. On the spot, multiple welding guns built into the balancing machine apply a balancing piece of appropriate weight to the propeller shaft. A method of welding in place is adopted.

Conventional welding methods using a balancing machine include a so-called "top-mounted" welding gun, in which a balancing piece is placed on the propeller shaft in advance and then sandwiched between a pair of electrodes from above and below for welding. In practical use, a "bottom type" welding gun, in which a balancing piece is placed on the lower electrode in advance, is inserted between a pair of electrodes from above and below the bottom of the propeller shaft for welding. It has been.

Conventionally, this kind of top type and bottom type welding machines include those described in Japanese Patent Publication No. 54-27183 and Japanese Patent Publication No. 54-27184 entitled "Propeller Shaft Balance Piece Welding Apparatus". be.

In other words, the bottom type welding machine described here is 1
．． The pressurizing cylinder body is attached to a frame that moves along a horizontally arranged guide rail so that it can be raised and lowered, and the upper electrode is attached to the rod of the pressurizing cylinder, and the arm that is integrated with the pressurizing cylinder body is attached. The lower electrodes are installed facing each other, and the lowering position of the upper electrode is adjusted in advance using the upper electrode position adjustment mechanism provided between the rod of the pressurizing cylinder and the frame, so that the upper electrode is just aligned with the upper surface of the propeller shaft. When the upper electrode comes into contact with the upper surface of the propeller shaft, the cylinder body moves upward due to the reaction force pushing the propeller shaft, and the lower electrode lifts up, causing the balancing piece to move upward. It is pressed against the lower surface of the propeller shaft, and welding current is passed between the upper and lower electrodes to weld them together under pressure.

(Problems to be Solved by the Invention) However, since the above-mentioned conventional machines are dedicated machines, the structure cannot be easily changed from a bottom-mounting type to a top-mounting type depending on the application. Since the structure is such that the lowering position of the cylinder rod is adjusted in advance by an upper electrode position adjusting machine and the upper electrode is stopped at a predetermined lowering position, the following improvements were required.

In other words, this kind of bottom-mounted type is shown in Figure 5 (
5) ~ (As shown in q, the lower electrode (E,) and the balancing piece (P) are placed from above and below on the propeller shirt, which has been supported in a predetermined position by the balancing machine in advance. E2) and lower the cylinder loft to stop the upper electrode in contact with the upper surface of the propeller shaft, but as a practical matter, the upper electrode should be placed in advance so that no force is applied to the propeller shaft. It is quite difficult to adjust the upper electrode stop position and successfully stop it on the top surface of the propeller shaft.For example, if there are variations in the diameter of the propeller shaft, or if the electrode wears out, for example,
As shown in Figure 5 (b), a gap (e) is created between the upper electrode and the upper surface of the propeller shaft, and if welding pressure is continued in this state, an unreasonable force will be applied as shown in Figure 5 (q) and the balance will be lost. There was a risk that the machine could be deformed or damaged, and there was still room for further improvement to solve this problem.

(Means for Solving the Problems) Therefore, the present invention was developed to solve the above problems, and involves installing an automobile propeller shaft in a balancing machine, rotating it at high speed, and adjusting its eccentricity. This is a device that pressure-welds a balancing piece to an appropriate part of a propeller shaft through an electrode while making measurements. Furthermore, the gun arm is fixed integrally with the pressurizing cylinder body, and has a welding gun in which lower electrodes that come into contact with the lower surface of the propeller shaft are fixed to face each other at the tip of the gun arm. It is supported on a support base that moves along a fixed rail installed in the horizontal direction so that it can move in the vertical direction via a guide mechanism and can also swing in a direction perpendicular to the fixed rail. An electrode lifting mechanism is installed between the support stand and the guide mechanism to touch the upper electrode or the lower electrode to the surface of the propeller shaft while supporting the weight of the entire welding gun.

(Function) The present invention moves the entire welding gun while supporting the weight of the entire welding gun with the electrode lifting mechanism, and securely moves one electrode before the other without applying force to the surface of the propeller shaft. The soft touch function prevents deformation and damage to the balancing machine, improves parts accuracy, and allows the lifting mechanism to contact or connect to the piston rod side or arm side of the pressure cylinder. By doing so, it is possible to realize a common welding gun whose structure can be easily changed into a top-mounted type and a bottom-mounted type depending on the application.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the entire welding apparatus of the present invention.

The fixed rail (1) of this device has two pillars (2) (2)
It is supported by extending horizontally. The fixed rail (1) has three parts that can be moved horizontally left and right.
Base support stands (3...) are arranged, and welding guns (G... ) is supported. A welding transformer (7) is installed on a pedestal (6) supported horizontally behind the fixed rail (1), and a flexible kickless two-way The above-mentioned welding gun (q) is mounted on two supports (2) above the fixed rail (1) in order to balance its weight so that it can be easily operated by hand. ') (2')
It is suspended by a balance (10) that can move left and right on a rail (9) that is supported in a height-adjustable manner.

FIG. 2 is a side view showing a specific example of the construction of the welding apparatus of the present invention, and FIG. 3 is a front view thereof.

The device of the present invention consists of a basic structure such as a welding gun (q), a guide device (5), an electrode lifting mechanism (4), a support stand (3), etc. The support stand (3) is attached to the fixed rail (1). It can freely move left and right on the fixed rail by a bearing (11) fitted to the upper end and a travel (13) equipped with guide rollers (12) (12) that contact both sides of the lower end of the fixed rail (1). Also, this support stand (3) has a support pin (14) connected to the upper part of the travel belt (13) so that it can swing in a direction perpendicular to the fixed rail (1).
It has a structure that allows it to rotate around the center.

The welding gun (q) has an upper electrode (E,) at the tip of the piston rod (16) of the pressure cylinder (15), and an insulating member (17) on the main body side of the pressure cylinder (15). A lower electrode (
E2). The opposing electrode surfaces of the upper electrode (E,) and lower electrode (E2) are curved with a curvature that matches the circumferential surface of the propeller shaft (W). Therefore, if the diameter of the propeller shaft is different, the upper and lower electrodes must be replaced.

Next, the electrode lifting mechanism (4) includes a lifting cylinder (20) fixed to the upper part of the support base (3) with a piston rod (19) vertically lowered, and a piston rod (21) of this cylinder. The tip is equipped with a guide rod (24) connected via a floating device (23) containing a spring (22), and a bearing (3) fixed to the support base (3).
25) The guide loft (24) passes through (25),
Moreover, the support arm (26) fixed to the lower end of the guide rod (24) is connected to the piston rod (
16) and is supported by the guide device (5).
It has a structure that supports a weight close to 9.

As shown in FIG. 4, the floating device (23) has a connecting device (23) in which the T-bulged head (28) of the guide rod (24) is screwed onto the tip of the piston rod (21) of the lifting cylinder (20). 41), and a spring (S) is inserted inside this connector (41) so as to surround the outer periphery of the guide rod (24). 1 from the specified stop position
2 kg on the propeller shaft even when pushed down by mm
This spring (S) is designed so that an upward force acts on it so that only a force of .

Conversely, even if a gap occurs between the upper electrode and the propeller shaft due to variations in the diameter of the propeller shaft, this can be absorbed.

The guide device (5) includes brackets (29) (29) fixed to the upper and lower parts of the pressurizing cylinder (15).
Bearings (30) (30) are fixed to the tips of the bearings (30) (30), and the guide rod (24) passes through the bearings (30) (30), and the slide connected between the brackets (29) (29) The rod (31) passes through a bearing (32) fixed to the support base (3) to guide the entire welding gun in the vertical direction.

A safety knock device (33) is provided on the open side of the upper electrode (E,) and lower electrode (El). This safety knock device (33) includes a cylinder (34) fixed to the main body side of the pressurizing cylinder (15), and a pressurizing cylinder (1).
By inserting the tip of the piston rod (35) into the connector (36), the opening (37) between the upper and lower electrodes is closed. Up·
Safety during work can be ensured by high-speed rotation of the propeller shaft (W) inserted between the lower electrodes.

The handle (38) fixes the left and right movement of the travel (13) by turning it clockwise, and the handle (39)
) is for fixing the movement of the support base (3) in the swing direction. (40) is a pair of positive and negative conductors that form a current-carrying path between each electrode (E, XE,) and are connected to the secondary cable (8).

The operation will be explained below.

First, the propeller shaft (W) is set in the balancing machine with the safety knock device (33), upper electrode (EI), and lower electrode (El) open. Rotate the propeller shaft at high speed with a balancing machine, measure its eccentricity, and use the measurement results to correct the weight balance by moving the welding gun (q) to an appropriate location on the propeller shaft and placing it on the lower electrode (El) for balancing. Peace (P)
and complete the preparations before welding (see Figure 6 (5)).

When welding, operate the lifting cylinder (20) of the electrode lifting mechanism (4) and move the support arm (2) of the guide rod (24).
6) is hooked to the lower side of the contact piece (27) fixed to the piston rod of the pressurizing cylinder (15), and the welding gun (q) is lowered while supporting the entire weight.

At this time, the upper electrode (E,) and lower electrode (El) lower in an open state, and at the same time the upper electrode (El) contacts the upper surface of the propeller shaft (W), the lifting cylinder (20
) stops at the stroke end (see Figure 6 (B))
. Thus, when air is supplied to the pressurizing chamber of the pressurizing cylinder (15) and the upper electrode (El) is pressed, the upper electrode does not move and the pressing reaction force from the propeller shirt (W) is applied to the entire welding gun (q). As a result, the arm (18) is pushed upward, and as a result, the lower electrode (El) rises, and the propeller shirt (W) and balancing piece (P) are connected to both electrodes (B, XE, ) from above and below. If the pressurizing cylinder (15) continues to pressurize in this state, the propeller shaft will be evenly pressurized from above and below to the pressure necessary for welding, and at the same time both electrodes (El) (El) A current is passed between them, and a balancing piece is welded to the lower surface of the propeller shaft (see Figure 6 (q)).In this way, while measuring the eccentricity of the propeller shaft using a balancing machine, it is possible to correct the balance each time. Welding work will be carried out on the spot.

After welding is complete, remove the upper and lower electrodes and the safety knock device (33
), and all equipment is returned to its original state in preparation for the next propeller shaft balance measurement and weight correction.

In the above welding operation, even if the upper electrode (El) pushes down the propeller shaft by about 1 mm or 2 mm, this will result in a slight force of 2 k against the balancing machine due to the floating action of the elasticity.
Since only 9 g to 4 g is applied, the workpiece will not be deformed or distorted, and a soft touch can be achieved reliably. Even if there are variations in the diameter of the propeller shaft, the upper electrode and propeller The gap created between the floating device and the shaft is absorbed by the elasticity of the floating device, and the upper electrode can be soft-touched to the propeller shaft.

(Other Embodiments) In the above-mentioned embodiments, the welding device for a lower type 4 balancing machine was explained as being on the front side of the house, but the basic principle of the present invention is not limited to this, and for example, As shown in Figure 7, the electrode lifting mechanism (20
), the supporting arm (26) fixed to the guide rod (24) of the arm can be brought into contact with or connected to the contact piece (27) fixed to the arm. Can be used as a welding device.

In this case, the balancing piece is the upper electrode (El)
Set it on the top of the propeller shaft located directly below the
Prior to pressurizing the upper electrode, the electrode lifting mechanism (20) raises the entire welding gun, and the lower electrode (E2) is soft-touched to the lower side of the propeller shaft.

(Effects of the Invention) As described above, the present invention provides a device for welding an automobile propeller shaft and a balancing piece, in which an upper electrode or a lower electrode is moved to a soft touch on the surface of a propeller shaft while supporting the weight of the entire welding gun. Equipped with this mechanism, it is possible to easily create a balancing welding device that can be used for two types, top-mounted and bottom-mounted, depending on the application. Even if there is a slight gap between the propeller shaft and the electrode, or if the electrode moves slightly from its designated stopping position and the propeller shaft bends, no unreasonable force beyond a certain level will be applied to the propeller shaft. This can be absorbed by the floating action of 1 elasticity, so the electrode can always be reliably soft-touched to the propeller shaft, preventing distortion, deformation, or damage to the balancing machine, and improving component accuracy. I can figure it out.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing one embodiment of a welding device according to the present invention. FIG. 2 is a side view showing a specific example of the configuration of the lower type device of the present invention. Figure 3 is also a front view. FIG. 4 is a sectional view of essential parts showing an example of the internal structure of the floating device. FIG. 5 is an explanatory diagram showing the operation of a conventional lower type welding device. FIG. 6 is an explanatory diagram showing the operation of the apparatus of the present invention. FIG. 7 is a side view showing an embodiment in which the structure of the device of the present invention is changed from a lower type to an upper type. [Explanation of symbols] (1)...Fixed rail, (3)...Support stand, (4)
... Electrode lifting mechanism, (5) ... Guide device, (15
)...Pressure cylinder, (16)...Piston rond, (18)...Gun arm, (Et)...Upper electrode, (E2)...Lower electrode, (G)...Welding gun,
(P)...Balancing piece, (W)...Prope (A) CB)
rc) Chest 5 (A) CB)
(C) Figure 6 2 Figure 7

Claims (1)

[Claims] A device that installs an automobile propeller shaft in a balancing machine, rotates it at high speed, and pressure-welds a balancing piece to a suitable location on the propeller shaft via an electrode while measuring its eccentricity. An upper electrode that contacts the upper surface of the propeller shaft is attached to the tip of the piston rod of the pressurizing cylinder, and a lower electrode that contacts the lower surface of the propeller shaft is attached to the tip of the gun arm, which is fixed integrally with the pressurizing cylinder body. The welding gun is fixed to a supporting base that moves along a horizontally installed fixed rail.
It is supported to be movable in the vertical direction via a guide mechanism, and between the support stand and the guide mechanism, an upper electrode or a lower electrode is placed on the surface of the propeller shaft while supporting the weight of the entire welding gun. A welding device for balancing machines equipped with a touching electrode lifting mechanism.