JPH02155580A - Continuous welding type electron beam welding machine - Google Patents

Abstract

PURPOSE:To realize welding which scarcely generates a blowhole by executing welding to a work installed in one welding jig in a welding chamber, isolating airightly the welded work on the jig by using a subchamber, and taking out and supplying the work. CONSTITUTION:In a welding chamber 40, an index table 1 containing plural jigs 2 is contained. To a work 20 installed in one welding jig 2 in the chamber 40, welding is executed by an electron beam 100. A welded work 20' on a welding jig 2' in the chamber 40 is isolated airtightly from the inside of the chamber 40 by using a subchamber 46 formed by allowing the jig 2' to ascend, and the work 20' is taken out and supplied. In such a way, welding which scarcely generates a blowhole can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous type electron beam welding machine that performs electron beam welding of small parts in large quantities in an extremely short cycle time.

[Conventional technology]

The structure of a conventional continuous welding type electron beam welding machine is shown in FIG. In FIG. 3, reference numeral 1 denotes an index table for indexing a plurality of (four in the figure) welding jigs 2 in 90° increments and sending them directly below the upper chamber 4;
20 is a workpiece to be welded mounted in the welding jig 2, and 3 is an O-ring that maintains airtightness when the welding jig is connected to the upper chamber 4. Note that when the welding jig 2 is sent directly below the upper chamber 4, it is raised in the direction of the arrow 21 by a lifting and lowering element (not shown), and is combined with the upper chamber 4 to form a welding chamber. The exhaust port 5 of this welding chamber is evacuated to a required degree of vacuum in the direction of the arrow by a pump (not shown).

This pump has the function of stopping exhaustion after welding is completed, and conversely introduces air into the welding chamber to return it to atmospheric pressure. The electron gun chamber 7, which accommodates the electron guns such as the grid 31 and anode 30, and the upper chamber 4 are partitioned by a column valve 51 (state of 51'), which is closed until the vacuum level of the upper chamber 4 reaches a required level. Then, a vacuum level detector (not shown) detects that the required degree of vacuum has been reached, and the vacuum level detector (not shown) is set to the "open" state shown in the figure, and the electron beam 100 emitted from the electron gun 31, 30 is transferred into the jig 2'. to the weldment 20' located at. The column valve 51 is housed in an intermediate chamber 60. The intermediate chamber 60 and the electron gun chamber 7 are also evacuated to a required degree of vacuum by a vacuum pump (not shown). With this configuration, when mass producing workpieces of the same shape, the operation time chart shown in Figure 4(a) is used. The process can be performed in parallel at different stations, resulting in short cycle times and high throughput.

[Problem to be solved by the invention]

However, as shown in Figure 4(a), the conventional continuous electron beam welding machine described above performs chamber evacuation and welding in series, which becomes a bottleneck in increasing throughput and reduces productivity. Ta.

An object of the present invention is to provide a continuous welding type electron beam welding machine that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, the continuous welding type electron beam welding machine according to the present invention includes a welding chamber that houses an index table including a plurality of welding jigs, and a welding jig installed in one of the welding jigs in the chamber. A welding ring for performing welding on a workpiece and a welded workpiece installed on a welding jig in the chamber are airtightly isolated from the inside of the chamber,
It has a subchamber for taking out and supplying workpieces.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A' in FIG. 1, and the dissipating element in FIG.
They have the same number.

In the figure, a welding chamber 40 includes an index table 1, a jig 2, and a workpiece 20. The inside of this chamber 40 is maintained at a required vacuum level through the exhaust port 5 by an exhaust pump (not shown). 41 is a workpiece supply/exit door, 45 is an O-ring for airtight sealing thereof, and 42 is an exhaust port. 9 is a lens coil; 73 is a driven gear for rotating the workpiece 2o and performing circumferential welding;
72 is a rotating shaft. These are driven by meshing with a main drive side gear 71 rotated by a motor 7o. 74
is the seal on the shaft. 90 is a seal for the rotating shaft of the index table 1. 46 is a receiving R structure 0 of the jig 2' provided on the inner wall surface of the chamber 40.
The inside and outside of the jig 2 are airtight with a ring, and the inside is used as a subchamber 46. Reference numeral 80 denotes an air cylinder that raises the jig 2' via a thrust shaft 81 and a rotating shaft 72' and connects it to a receiving mechanism on the inner wall of the chamber. 82
is its shaft seal. A chamber vent valve 43 introduces air into a subchamber partitioned by the jig 2', the inner wall of the chamber 40, and the workpiece supply/takeout door 41. With the above configuration, the workpiece can be taken out and fed.
Before that, welding stage (on the left side of the figure, electron beam 10
At the same time as welding of the workpiece 2o sent to the irradiated position) is started, the jig 2' is pushed up with the air cylinder 80, the inside and outside of the jig 2' are partitioned with the airtight seal 46, and only the inside is closed with the chamber vent valve 43. to the atmosphere. Thereafter, the workpiece supply/takeout door 41 is opened, and the workpiece 20' is taken out and supplied. When the take-out and supply is completed, the work supply take-out door 41 is closed, and the exhaust port 42 is evacuated to the same vacuum level as the inside of the chamber 40 with a roughing pump (not shown). ' is lowered, and after confirming that welding of the workpiece 20 has been completed in the welding stage, the workpiece 20 is sent to the welding stage by the index table 1.

According to the present invention, only when a workpiece is supplied and taken out, one jig located at a position opposite to the receiving allowance structure among the plurality of jigs is coupled, and only the inside of the subchamber is set to atmospheric pressure, and the workpiece is The workpiece is supplied and taken out from the supply and takeout door, and after the supply and takeout is completed, the inside of the subchamber is evacuated again using a special roughing pump, and when the vacuum level reaches the same level as the vacuum inside the welding chamber, the jig and receiving mechanism are The connection is to be broken, and as shown in FIG. 4(b), welding and chamber evacuation are performed in parallel to shorten the cycle time.

As explained above, in the present invention, chamber vacuum evacuation and welding proceed in parallel, so that a continuous electron beam welding machine with an extremely short cycle time and a large throughput can be realized.

〔Effect of the invention〕

Furthermore, by setting the number of jigs on the index table to four or more, it is possible to secure a preliminary evacuation time equivalent to one cycle time before and after welding, which ensures sufficient degassing from the welded workpiece and reduces blowholes. After welding, the workpiece is cooled down before being taken out into the atmosphere, making it possible to weld with less oxidation. Furthermore, since the welding jig is maintained in a vacuum state even when the apparatus is stopped, there is an effect that degassing aging of the jig, which is performed when the apparatus is started up, is not necessary.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing the configuration of a conventional device, and FIGS. 4(a) and 4(b) are timing charts showing the operating times of FIGS. 1 and 3. 1... Index table 2. 2'... Welding jig 3... 0 ring 4...
Upper chamber 5...Chamber exhaust port 6...Electron gun chamber exhaust port 7...Electron gun chamber 8...
High pressure table 9...Lens coil 20...Work 3o...Anode 31...Grid, filament 40...Chamber 41...Work supply/extraction door 42...Sub chamber exhaust port 43... Chamber vent valve 45... O-ring 46... O-ring 51... Column pulp 60... Intermediate chamber 7o... Work rotation motor 71... Main drive gear 72... Rotating shaft 73... Driven gear 74... Seal 8
0...Station push-up air cylinder 81...
Push-up shaft 82...Shaft seal 100...
...electronic bee 12

Claims (1)

[Claims] (1) A welding chamber that stores an index table including a plurality of welding jigs, a welding mechanism that performs welding on a workpiece installed in one of the welding jigs in the chamber, and a welding mechanism that welds a workpiece installed in one of the welding jigs in the chamber; A continuous welding type electron beam welding machine characterized by having a subchamber for airtightly isolating a welded workpiece installed in a chamber from the chamber and for taking out and supplying the workpiece.