JPH0523877B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a flash welding device for abutting and welding the rear end of a preceding metal strip and the leading end of a following metal strip. [Prior art] Conventionally, this type of flash welding equipment has
There was one shown in Figures 11 and 12. The figure shows a conventional flash welding device disclosed in Japanese Unexamined Patent Publication No. 51-49146. In the figure, 1 and 2 are metal strips, 3 is a fixed frame fixed to the foundation, and 4 and 5 are upper and lower electrodes on the fixed side, and the fixed frame 3 is provided. 6 is a movable frame, 7 and 8 are upper and lower electrodes provided on the movable frame 6, and 9 is a welding cylinder provided on the fixed frame 3, allowing the movable frame 6 to be moved. Reference numerals 10 and 11 are auxiliary clamps provided on the stationary frame 3 and the movable frame 6, respectively. A rotary shear 12 and a trimmer bit unit 13 are installed on the rear surface of the welding device section constructed in this manner. These are rail 1
4. Cylinder 16 mounted on base 15
It is designed to be able to move in the sheet threading direction. Next, the operation will be explained. Figure 11 and 1
As shown in Figure 2, in the threading line of metal strips 1 and 2 indicated by the dashed line, strip 1
A movable frame 6 is provided on a movable frame 6 that clamps the ends of the fixed side upper and lower electrodes 4 and 5 and the ends of the metal strip 2 and moves on the fixed frame 3 as if moved back and forth by a welding cylinder 9. There are upper and lower electrodes 7 and 8 on the sides. In this way, the basic configuration consists of a part that has a function for welding, a rotary shear 12 for cutting and refining the metal strips 1 and 2 on the rear surface, and a trimmer for removing excess buildup from the welding part. It consists of a bite unit 13. Incidentally, the positions of the rotary shear 12 and the trimmer bit unit 13 can be selected in the sheet passing direction using the cylinder 16 depending on the process procedure. When the preceding metal strip 1 is stopped in the welding device, it is clamped and held by the fixed side upper and lower electrodes 4 and 5 and the auxiliary clamp 10. Then, when the trailing metal strip 2 stops in the welding device,
Similarly, the upper and lower electrodes 7 and 8 on the moving side are clamped. Thereafter, the rotary shear 12 whose position is selected from the rear surface in the sheet passing direction moves forward to cut each strip end. When the end faces have been refined in this manner, the movable frame 6 advances, the strip ends abut against each other, and in this state, electricity is applied to perform flash welding. When welding is finished, the fixed upper electrode 4 rises, and then the movable frame 6 retreats. When the retreat is completed, the upper electrode 4 on the fixed side is lowered and clamped again. Next, when the upper electrode 7 on the movable side rises and the movable frame 6 retreats to secure a predetermined distance, the upper electrode 7 on the movable side lowers and becomes closed. The reason for performing such an operation is to widen the position of the welding part from the electrode and maintain the minimum distance between the trimmer bite unit 12 and the electrode so that they do not interfere. Such an operation of changing the electrode grip also needs to be performed when annealing the welded part. [Problems to be Solved by the Invention] Since the conventional flash welding apparatus is configured as described above, the movable frame is moved by the welding cylinder that controls the welding process, so the welding cylinder becomes large. Another problem was that it was complicated and time-consuming to re-grasp the strip to trim the excess weld. This invention was made to solve the above-mentioned problems, and it provides a flash welding device that is miniaturized by providing a moving mechanism to control the welding process, and also makes it easier to re-grip the strip for trimming. The purpose is to obtain. [Means for Solving the Problems] The flash welding device according to the present invention is provided with a first clamp mechanism and a first rotary shear on the stationary side, and a first carriage and a first carriage mounted on the first carriage on the movable side. The method is composed of two carts, the first cart is provided with a second rotary shear, the second cart is provided with a second clamp mechanism, and the first cart is provided with a moving mechanism that moves the second cart to control the welding process. It is something that Furthermore, in another invention, a third clamping mechanism for clamping the metal strip is provided on the first truck in order to facilitate re-grabbing the metal strip for trimming. [Function] The flash welding device in this invention has a first
After moving the second cart to the specified position using the cart,
The second cart is controlled by the moving mechanism when controlling the welding process. Also, when the metal strip is re-grasped for trimming, the metal strip is clamped by the third clamping mechanism. [Embodiments of the Invention] Examples of the invention will be described below. In FIGS. 1 to 3, 1 to 5, 7, and 8 are the same as the conventional ones. 17 is a common base to which the fixed frame 3 is fixed. The fixed frame 3 is provided with a fixed-side upper electrode 4 and a lower electrode 5.
18 is a fixed side clamp cylinder that drives the electrode 4. 19 is a guide rail provided on the fixed frame 3; 20 is a fixed-side rotary shear saddle guided by the guide rail 19; and 21 is a saddle 2.
22 is a motor that drives the saddle 20 via the chain 21; 23 is an elevating cylinder fixed to the saddle 20; 24 is a fixed rotary shear that is raised and lowered by the elevating cylinder 23;
5 is a trimmer saddle guided by a guide rail 19, 26 is a lower trimmer bite unit attached to the saddle 25, 27 is a trimmer guide rail fixed to the fixed frame 3, and 28 is a guide rail 2.
7 is the trimmer saddle guided, 29 is saddle 2
Upper trimmer bite unit attached to 8, 30
is the trimmer drive cylinder, 31 is the saddle 25, 2
8 and the cylinder 30; 32 is a current-carrying rod; 33 is a cylinder for moving the current-carrying rod 32; 34 is a detachable unit for press-contacting the current-carrying rod 32 to the lower electrode 5; 35 is a common base 17.
The rail provided above, 36, is a first truck mounted on the rail 35 via wheels 37, and the rail 36
It is possible to run on 5. 38 is a drive cylinder for moving the first truck 36, 39 is a rail provided on the first truck 36, and 40 is a wheel 4 on the rail 39.
The second truck is mounted on the second truck via 1, is provided with an upper electrode 7 and a lower electrode 8, and can run on a rail 39. 42 is a drive cylinder for moving the second truck 40, and is provided on the first truck 36. It should be noted that both carts 36 and 40 are constructed so as not to overturn due to upset force. 43 is the first truck 3
6, a moving-side rotary shear saddle 44 is guided by the guide rail 43, and 45a is a chain connected to the saddle 44, which is driven by a drive motor 45b. 46 is an elevating cylinder fixed to the saddle 44, 47 is a movable rotary shear that is raised and lowered by the elevating cylinder 46,
48 is a welding transformer provided on the first truck 36;
49 is a removable conductor provided on the first truck 36, which is connected to the welding transformer 48 and is connected to the current-carrying rod 32.
It is possible to come into contact with and separate from it. 50 is a connecting conductor connecting the lower electrode 8 and the welding transformer 48, and 51 is a movable clamp cylinder that drives the upper electrode 7. 52
is an auxiliary clamp for clamping the metal strip 2, and is provided on the first truck 36. Next, the operation will be explained. 1 to 3, the metal strip 1 stopped near the welding position is clamped by the upper electrode 4 on the fixed side, and the fixed rotary shear 24 is driven by the motor 22 from the top to the bottom as shown in FIG. The end of the metal strip 1 is cut and refined. At this time, the trimmer bit units 26 and 29 run so as to follow the rotary shear 24, and wait in the lower part of FIG. 2. Similarly, when the trailing metal strip 2 stops near the welding position, the moving side upper electrode 7 is lowered by the cylinder 51 and clamps the metal strip 2. Then, the leading end of the trailing strip 2 is cut and refined by the movable rotary shear 47. By providing two rotary shears in this manner, it is possible to widen the cutting interval, so that it is possible to increase the amount of crop processing. After cutting and refining the ends of both metal strips 1 and 2 in this manner, the first carriage 36 is moved forward by the moving cylinder 38. Then, the current-carrying rod 32 is advanced by the cylinder 33 to form a current-carrying secondary circuit via the detachable conductor 49. In a situation like this,
Flash welding is performed in the state shown in Figure 4. At this time, the first carriage 36 is in a fixed state, that is, the movable cylinder 38 is blocked in terms of circuit, and the second carriage 36 is flash-fed by the welding cylinder 42, thereby taking charge of the upset feeding process. After welding,
It is necessary to remove the excess buildup at the weld area. Here, we will briefly explain the clamp spacing required for cutting, welding, and trimming. Fifth
Figure a is an explanatory diagram of the initial electrode spacing. In the figure, 2A is the initial electrode spacing, and A is the protrusion margin.
When flash welding is performed in this state, the electrode spacing becomes narrower by the total consumption of welding, resulting in B, as shown in Figure b. In other words, B is the final electrode spacing. This final electrode spacing B is narrower than the trimabide width l in order to ensure welding quality. Therefore, after welding is completed, as shown in Figure c, it is necessary to widen the electrode spacing so that the value of D is wider than the trimmer bit width l. Figure 5d
This is to explain the electrode spacing when a process for annealing the weld is required. In order to perform uniform electrical heating, it is necessary to widen it further than D to E. In any of these cases, it is necessary to quickly change the electrode spacing in each process in the flash welding machine. This device performs the following operations in place of the conventional auxiliary clamp. That is, after welding is completed, the auxiliary clamp 52 is lowered, and the fixed upper electrode 4 and the movable upper electrode 7 are raised. Thereafter, the first cart 36 and the second cart 40 are moved and clamped again, thereby ensuring the trimming interval D. In parallel with this operation, the current-carrying rod 32 is moved backward. Then, trimming is performed in the state shown in FIG. In FIG. 5, the final electrode spacing B is set to D,
In order to make the distance from the electrode to the welding part the same, it is sufficient to simultaneously operate the first cart 36 by DB and the second cart 40 by DB/2. The table below shows a comparison between the conventional re-grasping operation and the present invention's re-grasping operation. However, the auxiliary clamp 52 holds the metal strip 2 in advance.

〔Effect of the invention〕

According to this invention, the fixed side is provided with the first clamp mechanism and the first rotor shear, and the movable side is composed of the first truck and the second truck mounted on the first truck. The overall installation space is reduced by installing two rotary shears, a second clamp mechanism on the second truck, and mounting a moving mechanism on the first truck that moves the second truck and controls the welding process. It is possible to reduce the size of the moving mechanism. Further, by providing the first truck with a third clamping mechanism for clamping the metal strip, it is possible to easily re-grip the metal strip for trimming.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a plan view of Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is an explanatory diagram showing the welding state in Fig. 1, and Fig. 5 shows the operating state of Fig. 1. In the explanatory diagram, a is the initial electrode spacing, b is the final electrode spacing, c is the electrode spacing during trimming, and d is the electrode spacing during annealing. Fig. 6 is an explanatory diagram showing the trimming situation, Figs. 7 to 10 are front views showing other embodiments of the present invention, Fig. 11 is a plan view of a conventional flash welding device, and Fig. 12 is a plan view of a conventional flash welding device. 1st
Figure 1 is a plan view. In the figure, 1 and 2 are metal strips, 3 is a fixed frame, 4 is a fixed side upper electrode, 5 is a fixed side lower electrode, 7 is a moving side upper electrode, 8 is a moving side lower electrode, 18 is a fixed side clamp cylinder, 23 is a lifting cylinder, 24 is a fixed rotary shear, 26 and 29 are trimmer bite units, 30 is a trimmer drive cylinder, 36 is a first truck, 38 is a drive cylinder, 40 is a second truck, 42
46 is a driving cylinder, 46 is an elevating cylinder, 47 is a movable side rotary shear, and 52 is an auxiliary clamp.
Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a flash welding device that butts and welds the rear end of a preceding metal strip and the tip of a following metal strip, a first clamp mechanism that clamps and holds one of the metal strips and a cutting mechanism. Install the first rotary shear on the fixed side,
A second rotary shear for cutting the other metal strip is installed on a first movable truck, and a second rotary shear mounted on the first truck and installed on a second movable truck is mounted on the first movable truck.
Flash welding characterized in that the welding process can be controlled by clamping and holding the other metal strip with a clamp mechanism and moving the second truck with a mobile mechanism installed on the first truck. Device. 2. In a device in which the rear end of the preceding metal strip and the tip of the following metal strip are butted together and welded, and the excess of the welded part is removed by a trimmer device, the first metal strip that clamps and holds one of the metal strips is A clamping mechanism and a first rotary shear for cutting are installed on the fixed side, a second rotary shear for cutting the other metal strip is installed on a movable first cart, and a movable second rotary shear is mounted on the first cart. A second clamp mechanism installed on the truck clamps and holds the other metal strip, a moving mechanism installed on the first truck moves the second truck to control the welding process, and the welding process is controlled by moving the second metal strip with a moving mechanism installed on the first truck. A flash welding device characterized in that the second metal strip can be clamped and held by a third clamp mechanism installed therein.