JPS58165251A - Method of manufacturing latticework for lead storage battery - Google Patents

Abstract

PURPOSE:To absorb feed irregularity when expanding a thin sheet of lead or lead alloy to make a lattice like a net, by making the length of the parallel part of the tip of a cutter not less than that of the node of the wire of the lattice. CONSTITUTION:The tip of a cutter 1 is provided with a relatively-long parallel part (a), the length of which is equal to the sum of the length of a node 6 and a feed length irregularity. When the length of the node 6 is 3mm. and the feed length irregularity is 2mm., the length of the parallel part (a) is 7mm.. When a reticulate lattice (m) is formed, the node 6 is made 3mm. long and a bent part 7 is made 7mm. long. Although the feed length fluctuates in the range of 2mm., stress concentration is avoided because the ends of th bent part 7 and the node 6 are located in coincident positions. Since deformation is not caused, the total height (b) of the reticulate lattice (m) is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a grid for a lead-acid battery, in which a thin plate of lead or a lead alloy is expanded to form a mesh grid.

The conventional method of forming a mesh grid on a thin plate (hereinafter referred to as a sheet) of lead or lead alloy is to use the required number of cutting blades 1 as shown in Figure 1.
A feed roll 5 that rotates intermittently while driving the mold 2 equipped with the mold 1 up and down in the direction of the arrow by the rotation of eccentric cams 6.
- In this method, the sheet 4 is fed a predetermined length in step 5, and the sheet 4 is cut open with the cutting blade 1r to form a mesh lattice. In this case, the shape of the tip of the cutting edge 1' is either simply circular as shown by afl or a12 in Figures 2 and 6, or it has a very small parallel part of about 0.5% and both ends are chamfered. The shape of the mesh lattice m' formed by this type of cutting edge 1t is a rhombus-shaped quadrilateral as shown in FIG.

In the conventional method described above, the lengths of the feed rolls 5 naturally vary. This variation is the fifth
As shown in the figure, the knot portion 6' and the bent portion 7' are misaligned, resulting in variations in the total height of the mesh m' shown in b' of the figure. In addition, as shown in FIG.
There are many accidents in which the grid wire 8' breaks due to stress concentration at the end C of the grid wire 8', and each time it is necessary to repair the feed mechanism to correct the dispersion in the feed length, which is a major problem in production. Ta.

The present invention provides an effective method for solving the above-mentioned problems caused by variations in feed length, and will be described in detail below.

First, in order to avoid stress concentration in the 0 part shown in Fig. 6,
As shown in the figure, a relatively long parallel portion a is formed at the tip of the cutting blade 1. The length of the parallel portion a is .

The length of the joint is assumed to be 10 times the length of the feed. That is, if the length of the knot is 5% and the variation in feed length is ±2%, the length of the parallel portion a at the tip of the cutting edge 1 will be 7% in total. When the mesh mesh m is formed using the cutting blade 1, it becomes a shape as shown in Fig. 8, and the knot part 6 is 6%, the bent part 7 is 7%, and even if the feed length is varied by ±2%, the bent part is not large. Since the ends of the lattice wires 7 and the ends of the knots 6 are placed in the same position, concentration of stress as shown in FIGS. 5 and 6 can be avoided, and an accidental cutting of the lattice wire 8 can be prevented. Further, the bent portion 7 can be kept in a constant horizontal position, and the height accuracy of the completed electrode plate can be improved.

The shape of the tip of the cutting edge 1 according to the present invention may be within a range that absorbs the variation in feed length, so if the variation is O, the length of the parallel portion a of the tip of the cutting edge 1 is the same as that of the knot 6. Therefore, if the variation is ±0.5 or more, the length of the knot 6 is +1%. In this way, the present invention solves the problem by easily absorbing the feed variation by changing the shape of the cutting edge, which conventionally had to be corrected by improving the precision of the sheet feed variation that naturally occurs during manufacturing. - It was successfully prevented from dying. Therefore, according to the present invention, it is possible to naturally eliminate all feed variations caused by play in the expanded type plate manufacturing equipment or variations in sheet thickness, thereby increasing work efficiency. The industrial value is enormous.

The above-mentioned embodiment shows one example of the present invention, and to explain other embodiments, the cutting accident of the lattice wire 8 often occurs at the lowest lattice wire 8 shown in FIG. If the purpose is only to prevent the above-mentioned lattice wire 8, even if the parallel portion of the present invention is provided only at the cutting edge where the lattice wire 8 is formed, the effect can be sufficiently exerted. As another example, the cutting blade for forming the lowermost grid wire 8 shown in FIG. Even if a cutting blade is used in which the length of the parallel portion is gradually shortened as the length increases, it is highly effective in preventing cutting accidents of the lattice wire.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an expanding machine equipped with a conventional cutting blade, Figs. 2 and 6 are side views of essential parts showing each side of the tip shape of the conventional cutting blade, and Fig. 4 is FIG. 5 is a plan view of the main part of the conventional mesh lattice, showing a state where sheet feed variation occurs, and FIG. FIG. 7 is an enlarged plan view of the main part showing the deformed state, FIG. 7 is a perspective view of the main part showing the tip shape of the cutting blade according to the present invention, and FIG. 8 is a plan view of the main part of the mesh lattice obtained by the present invention. It is. 1... Cutting blade a... Parallel part 6...
Nodule part 7...Bending part 8...Grid wire m...Mesh lattice Applicant Yuasa Battery Co., Ltd. Figure 5 7'm/m' Figure 6

Claims (1)

[Claims] 1) When expanding a thin plate of lead or lead alloy to form a mesh lattice, the parallel portion of the tip of the cutting blade is made to have a length equal to or longer than the length of the node of the lattice wire. A method for manufacturing a grid for lead-acid batteries, characterized by using a cutting blade. 2) The method for manufacturing a lead-acid battery lattice body according to claim 1, characterized in that the cutting blade is used to form the reticulated lattice located at the lowest part. 3) A cutting blade with the maximum length of the parallel part at the tip of the cutting blade was used to form the net-like lattice located at the bottom, and the length of the parallel part was gradually shortened toward the top of the net-like lattice. 2. A method for manufacturing a grid for a lead-acid battery according to claim 1, characterized in that a cutting blade is used.