DE3211781A1 - WELDING MACHINE FOR A CONTAINER BODY - Google Patents

Description

¹⁷⁸¹

Welding machine for a container body

The invention relates to a welding device for a container body and in particular guide parts in this welding device for the object to be welded, in which a lateral weld seam in the container body, which consists of metal, for example tinned sheet metal, is introduced, the overlapping parts of the lateral weld seam are guided between an upper and a lower roller electrode.

A known arrangement for guiding an object to be welded together with other parts of a known welding device for a container body are shown in side view in FIG. 1 and in one sectional pictorial view along the line Π-Π in FIG. 1 in FIG. 2 shown.

The device shown in these figures has an upper roller electrode 1 and a lower roller electrode 2, which is arranged immediately below the upper roller electrode 1. It also has the illustrated Welding device has a horizontally extending support 3 for the lower roller electrode 2, which is provided at one end of the support. At An intermediate guide part 6, which will be explained further below, is also mounted on this carrier. On the wall, not shown in detail Of the welding device, a rear fastening device is attached to which a rear guide part 5 is attached, which also on the upper Part of a rear piece 3a of the carrier 3 is attached. The intermediate guide part 6 is located on the carrier 3 immediately in front of the rear guide part 5. A front guide part 7 is located above the carrier 3 on the front side of the intermediate guide part 6. The front guide part has a tip 8 in close proximity and between the upper and lower roller electrodes 1 and 2.

Grooves 16 and 16 'extend to tip 8. A front fastener 9 is used to attach the front guide part 7 and is firmly connected to a horizontally extending support arm 11, which with a screw bolt 10, which extends vertically through the support arm of a screw nut 12 on the not shown Welder wall is attached. A screw bolt 14 is used to attach the front guide part 7 to a plate 13 of the front mounting part 9. Electrically insulating plates 15 and 15 ' are provided for electrical insulation between the individual parts.

The two longitudinal edges B and C of a container body to be welded A are inserted into the guide grooves 16 and 16 ′ in the front guide part 7. The guide grooves 16 and 16 'extend up to Guide grooves 18 and 18 '(18' is not shown) in the intermediate guide part 6 and sit in guide grooves 19 and 19 '(19' is not shown) in the rear guide part 5.

In the carrier 3, as can be seen from Fig. 2, are in the axial direction extending through bores 21, 22 and 23 are provided. The holes 21 and 22 serve as channels for cooling water to cool the The carrier 3 and the bore 23 serve as a guide channel for an electrode wire. Left and right incisions 24 and 25 are used to guide Ears for color and for determining the amount of color.

In the case of the FIG. 1 and 2 shown welding machine is a cylindrical one Container body made of a metal plate in FIG. 1 moving from the left to the right. The container body comprises the carrier 3 and its two edges B and C, which are connected to one another at the weld seam, are initially in the guide grooves 19 and 19 ' guided in the rear guide part 5. The container body then moves to the right in the figure along the guide grooves 18 and 18 '

in the intermediate support part 6 and then enters the guide grooves 16 and 16 ' in the front guide part 7. Finally, the container body comes into the tip 8 of the front guide part. The two edges B and C lie one above the other between the upper and lower roller electrodes 1 and 2. Due to electrical resistance heating, the Edges are heated and pressed against one another by the roller electrodes, so that they come together when passing through the two roller electrodes weld. The welding current flows through the upper roller electrode, through the container body, through the lower roller electrode and through the Carrier.

A different type of welding device, which is not shown in detail, for one from a tin-plated Bledi container is also known become. This is equipped with electrode wires that are wrapped around the upper and lower electrode rolls. These electrode wires will be guided over the overlap part of the container body to be welded when this overlap part is between the two electrode wires is used for welding. This welding device is also equipped with guide parts, as shown in FIGS are.

The welding speed in the welding machine for the side seam is about 50 m / min. A sufficient weld seam is obtained on the container body at a frequency of 420 Hz, a primary current of 120 A and a secondary current (welding current) of 3,600 A.

Attempts have been made to improve the welding speed and the yield in production of the above-described known one Increase welding machine. At a frequency of 600 Hz and an increase in the welding speed to 70 m / min, and one Primary current of 130 A showed that about 10 minutes after loading

At the beginning of the welding process, the container parts were not sufficiently welded were or the containers melted layers and / or detached or burnt coating layers on both sides of the to be welded Had parts. The welding process was then stopped for the reasons to investigate for this. It has been found that foreign matter is present in the guide grooves of the guide parts, in particular in the guide grooves 16 and 16 'of the tip 8 of the front guide part 7 was. The foreign matter consisted of tin, which was present as a protective coating on the container body and had become detached from it.

It has been found that the temperature of the tip 8 of the front Guide part 7 increases rapidly and there is a relationship between this Increase in temperature and the time which had elapsed since the start of the welding process, in the event that the frequency is 600 Hz and the primary current 130 A, as shown in graph Z in FIG.

From this graph it follows that the temperature after about. 10 minutes since the beginning of the welding operation, SOO has increased ⁰ C to about and continued increases in 20 minutes at 35O ⁰ C. Presumably, at such a high temperature, the coating and / or the tin applied to the surface will become detached and / or melted while the two cards of the container body to be welded come into contact with the walls of the guide grooves in the front guide part. In this way, the foreign matter settles on the walls of the guide grooves.

In addition, has been found in the experiment that 20 minutes after the start of the welding operation reaches a temperature of about 18O ⁰ C at a frequency of 420 Hz and a primary current of 120 A, the front guide part and that this temperature is approximately remains at 18O ° C.

The invention makes use of the above investigations and aims to improve the 'welding device shown in Figs.

The object of the invention is therefore to achieve an increased welding speed to achieve with this welding machine.

This object is achieved by the features specified in claim 1, wherein the subclaims contain further developments of the invention are.

The invention provides coolants that control the temperature keep the tip of the front guide part at a certain temperature during the welding process, so that no damage to the Surface coating on the parts of the container body which slide in and with the guide grooves of the tip of the front guide part come into contact with these.

The figures serve to further explain the invention. It shows:

Fig. 1 is a side view of a known welding device together with guide parts for the to be welded Object;

FIG. 2 shows a sectional representation along the section line Π-Π in FIG. 1; FIG.

Fig. 3 is a side view of the guide parts for the to be welded Subject as an embodiment of the invention;

4 shows a sectional representation along the cutting line

IV-IV in Figure 4;

Fig. 5 is a partially enlarged view of Figs

Fig. 6 are graphs showing the relationship between

and 7 the time after the start of the welding process and the

Reflect the temperature rise in the tip of the front guide piece.

In the following, an embodiment of the invention will first be explained with reference to FIGS. 3 to 5.

In Figures 3, 4 and 5 the same for corresponding parts Reference numbers are used as in FIGS. 1 and 2. These reference numbers are 1, 2, 3, 3a, 4, 5, 8, 15, 15 ', 16, 16', 18, 19, 21, 22, 23, 24, 25 , A, B and C.

Compared to the known guide parts, there is an improved intermediate guide part 36 and an improved front guide part 37 are provided. Furthermore, a fastening part 41 is provided around the intermediate guide part and the front guide part to each other. Screw bolts 42, 43 and 44 are used for this purpose.

The intermediate guide part 36 has, as can be seen from FIGS is, inlet and outlet ports 46 and 47 for a cooling liquid in the rear part 45 of a flushing device of the intermediate guide part 36. Furthermore, a vertical channel 48 is provided for the cooling liquid, which is in communication with the inlet opening. A horizontally running channel 49 leads to the front part 53 of the intermediate guide part 36. A channel 50 at the end of the channel 49

runs perpendicular to the plane of the drawing and a horizontal return channel 51 is arranged parallel to the horizontally arranged channel 49. The return channel is in communication with the outlet opening 47, so that the cooling liquid can be returned. The improvement of the front guide part 37 results in connection with the fastening part 41. The fixing part 41 is provided with inlet and outlet ports 61 and 62 for a cooling liquid at its rear End fitted. Furthermore, the fastening part has a horizontally extending channel 63 which is in communication with the inlet opening 61. This leads to the front end of the fastening part 41. At the front end of the channel 63, a further channel 64 is provided, which is vertical runs to the plane of the drawing. A return channel 65 runs parallel to the horizontally extending channel 63 and is in communication with the outlet opening 62. The front guide part 37 is also with a horizontal extending channel 72 which is in communication with a downward branch channel 71 which extends downwardly from horizontally extending channel 63 in the fastening part 41. A vertically extending channel 73 at the front end of the horizontally extending Channel 72 extends perpendicular to the plane of the drawing. A horizontally extending return channel 74 begins at the other end of the vertical extending channel 73 and extends parallel to the horizontally extending channel 72. The horizontally extending return channel 74 is in connection with a return branch duct 75, which extends from the horizontally extending return line 65 in the fastening part 41 extends downward. In this way, the cooling liquid, which in the system is introduced through the inlet port 61, introduced into the front guide part 37 and flows back to the outlet port 62.

Using the guide parts shown in FIGS. 3 to 5 water at 7 C enters the channels of the intermediate guide part and the

front guide part, possibly under pressure, introduced. The welding machine is operated at a frequency of 600 Hz and a primary current of 130 A, with a welding speed due to the cooling of the guide parts for the container body of 500 container bodies per Minute is achieved.

During several hours of continuous welding operation, this results no incorrectly welded container bodies. The relationship between the time and the temperature of the tip of the leading guide part during the welding operation are measured under the operating conditions given above, and the curve Y in FIG. 6 gives them Relationship again.

It became the relationship between the temperature of the tip 8 of the front Guide part and the operating time determined for the case in which the front guide part is not acted upon with a cooling medium is, at different frequencies and currents. The results are shown in FIG. From Fig. 7 it can be seen that that the temperature of the tip increases as the frequency and / or current are increased. On the other hand, experiments have shown that then when the degree of heating of the welded object through the contact with the front guide part is so high that applied metal or the protective coating on the surface is not destroyed detachment of the protective layer or inadequate welding do not occur. For example is the critical temperature in the case of tin-plated sheets, about 200 ° C. If, therefore, in the respective case according to FIG. 6 (curve representation Z) and FIG Inadequate welding is to be expected when coolants are not used, the invention will be used so that the initially mentioned disadvantages can be avoided.

In the embodiment described above, the cooling liquid passed through the fastening part 41, the intermediate guide part 36 and the front guide part 37 for cooling these parts. Care is taken that the cooling takes place in such a way that the temperature of the front guide part, in particular the top, not reaching the critical temperature. The temperature of the tip 8 can also be achieved by immersion cooling of the intermediate guide part and / or the fastening part which is in contact with the front guide part. Through the Parts cooled by immersion cooling then also cool the front guide part.

As can be seen from Fig. 7, the degree of temperature rise changes the peak as a function of the frequency and the current strength. When both the frequency and the amperage are low it is sufficient to have the front guide part at the desired temperature held solely by cooling the intermediate guide part.

In the above embodiment, the cooling liquid is inevitable introduced into the front guide part 37 via the fastening part 41. However, it is also possible to put the coolant directly in initiate the front guide part and provide a corresponding arrangement for this.

Furthermore, in the exemplary embodiment described above, there are channels provided for the coolant, which guide the coolant into the front guide part. These are in the front guide part, in the fastening part and disposed in the intermediate guide part which is in contact with the front guide part. However, it is also possible to blow a cooling gas such as nitrogen against the intermediate guide part and the front guide part through a nozzle,

so that a cooling atmosphere is created which is the temperature of the brings the front guide part below the critical temperature.

43
Blank page

Claims (4)

Patent attorneys
Steinsdorfstrasse 21-22 D-8000 Munich 22 Tel. 089/229441 Telex: 05/22208 DAIWA CAN COMPANY, LIMITED 1-10, Nihombashi 2-chome, Chuo-ku ,. Tokyo * lQ3, Japan Welding machine for a container body Patent claims: /\1.J Welding device for welding overlapping edge areas of a container body, on which a lateral weld seam is produced when the overlapped edge areas are passed through between an upper and a lower roller electrode, with a horizontally extending support, at one end of which the lower roller electrode is arranged and a front guide part arranged above the carrier, which has a tip that protrudes in close proximity between the upper and lower roller electrodes, as well as guide grooves that extend to the tip and serve to guide the two edge regions of the container body, with a Welding current flows through the upper roller electrode, the container body, the lower roller electrode and the carrier, characterized in that the temperature of the tip (8) of the front guide part (37) is adjusted during the welding process by coolant (45 to 52, 61 to 72) is that the respective ex protective layer on the container body parts that 10 318 - N / R come into sliding contact with the tip (8), remain undamaged. 2. Welding device according to claim 1, characterized in that the coolant has a channel (72, 73, 74) in the front guide part (37) have through which a coolant flows. 3. Welding device according to claim 1 or 2, characterized in that the coolant channels (48 to 52 and 61 to 65) in the intermediate support part (36) and / or a fastening part (41) which is in contact with the front guide part (37) are provided. 4. Welding device according to one of claims 1 to 3, characterized in that that the coolant has a nozzle through which a cooling gas is blown against the front guide part (37).