JPH0790374B2 - Vacuum chamber for welding - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a welding vacuum chamber.

2. Description of the Related Art In a conventional welding vacuum chamber, as shown in FIG. 2, one side of an electrode holder 13 to which an upper electrode 12 is fixed is inserted into a wall portion of a vacuum chamber 14 with a door, and a lower portion that penetrates the side wall of the vacuum chamber 14 is inserted. A lower electrode 16 provided above the conductor 15 is provided corresponding to the upper electrode 12. 17 is a vacuum exhaust hole of the vacuum chamber 14, 18 is a welding transformer, 19 is a flexible conductor, and 20 is an upper conductor. The vacuum conductor penetrating portion of the lower conductor 15 is kept sealed by an insulating material 21 and a sealing material 22. Therefore, the structure is such that welding is performed in the vacuum chamber.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, since the upper and lower electrodes are included in the same vacuum chamber, the volume of the chamber becomes large and it takes a long time to exhaust the gas to obtain a vacuum state. . In addition, in order to automate the supply of the welding object to the electrode part, the whole or part of the welding object transfer device must be installed in a vacuum chamber and constructed with equipment that can be used in a vacuum. Had a point.

Means for Solving the Problems In order to solve the above problems, the present invention has an outer cylinder provided in an electrode pressurizing system of a resistance welding apparatus, a conductive shaft having a vacuum exhaust hole penetratingly inserted thereinto, and the outer cylinder. An inner cylinder that slides independently from the electrode pressing system is provided between the conductive shafts, and the lower electrode with air bleed is fixed to the electrode holder in correspondence with the upper electrode fixed to the end of the conductive shaft. The outer cylinder is provided at a position in close contact with the inner cylinder end when sliding outward, and a closed chamber is formed around the electrode.

Operation Since the present invention has the above-described configuration, the vacuum chamber is a container divided into two, and by pressing one container against the other container, a closed structure is formed, and the inside of the vacuum chamber formed in advance is formed. Since the structure does not include the upper and lower electrodes, the chamber volume can be reduced, the electrode container on the pressurized part side can be replaced, and the transfer device for the welded object can be constructed in the atmosphere.

Embodiment Hereinafter, an embodiment of a welding vacuum chamber according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a welding vacuum chamber in an embodiment of the present invention.

Reference numeral 1 is a pressure head, 2 is an outer cylinder provided in the electrode pressure system, 3 is a conductive shaft inserted in the outer cylinder 2, 4 is an upper electrode fixed to the end of the conductive shaft 3, 5 is an upper electrode 4 and A vacuum exhaust hole is formed through the conductive shaft 3, 6 is an inner cylinder slidably formed between the outer cylinder 2 and the conductive shaft 3, and 7 is an air supply port formed through the wall of the outer cylinder 2. The inner cylinder 6 can be slid by sending compressed air from the air supply port 7. Reference numeral 8 denotes an electrode holder to which a lower electrode 9 is fixed. The electrode holder 8 is provided at a position where the end of the inner cylinder 6 sliding on the outer surface of the outer cylinder 2 comes into pressure contact, and the electrode holder 9 is a closed chamber. The inner cylinder 6 forming the bottom surface is arranged so as to form the peripheral side surface. 10 and 11 are upper electrodes 4
And air vent holes provided in the lower electrode 9.

Next, the operation will be described.

When the object to be welded is set and compressed air is sent from the air supply port 7, the inner cylinder 6 descends and comes into pressure contact with the surface of the electrode holder 8 to form a sealed structure around the electrode. Here, the vacuum exhaust hole 5
Is evacuated by a vacuum device, then the pressure head 1 descends to perform welding, and then the pressure head 1 rises,
The vacuum state is broken and the inner cylinder 6 also rises and returns to its original position.

As described above, since the sealed structure is formed only around the electrode part, which is the minimum required for the work, it is possible to obtain a vacuum state in a short time. Since it can be performed in the atmosphere, it is not necessary to build equipment in the vacuum chamber.

EFFECTS OF THE INVENTION As described above, the present invention relates to an electrode holder in which an electrode pressurizing system is provided with an outer cylinder and a conductive shaft having a vacuum exhaust hole, driving contents for pressing the electrode holder to form a sealed structure, and an electrode with an air vent hole By providing the vacuum container, the vacuum container can be divided, the volume of the vacuum chamber can be reduced and the vacuum exhaust time can be shortened, and the vacuum state can be formed only during welding work, and the supply of objects to be welded, etc. The other work can be performed in the atmosphere, and it has an excellent effect that it is not necessary to construct a device in the vacuum chamber.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a welding vacuum chamber according to the present invention, and FIG. 2 is a sectional view showing a conventional example. 2 ... Outer cylinder, 3 ... Conductive shaft, 4 ... Upper electrode 5 ... Vacuum exhaust hole, 6 ... Inner cylinder, 7 ... Air supply port 8 ... Electrode holder, 9 ... Lower electrode 11 ... Air vent hole

Claims (1)

[Claims] 1. A conductive shaft having a vacuum exhaust hole penetratingly inserted into an outer cylinder provided in an electrode pressurizing system of a resistance welding apparatus, and sliding between the outer cylinder and the conductive shaft independently of the electrode pressurizing system. A moving inner cylinder is provided, the lower electrode with air bleeding is fixed to the electrode holder corresponding to the upper electrode fixed to the end of the conductive shaft, and the inner cylinder end when sliding this electrode holder outward of the outer cylinder. A vacuum chamber for welding, characterized in that a closed chamber is formed around the electrode, provided at a position in close contact with the portion.