JPS63127811A - Method for setting working line - Google Patents

Abstract

PURPOSE:To effectively cut off plate members in cutting off a plurality of members from one plate material by selecting optimum length lines from the profile line of member to set the working line of each member on the plate member for making these lines of common working line. CONSTITUTION:When a plurality of clamp members A-F are cutt off from one plate material 30, the longest profile line portion and the next profile line constituted from one or two straight lines are selected from the profile lines of these members, and the working lines of two members are set on the plate member 30 so that these portions provide a common working line. Next, considering the two member as one member, similar operations are repeated so that the working lines of respective members A-F are set. Thus, in cutting off one member, a portion of working lines for the other members is effectively cut off so that a time taken for cutting off a plurality of members can be shortened for effective working operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing line setting method when cutting out a plurality of members from a plate material, and more specifically, for example, for positioning a structure such as a vehicle when assembling the structure. When cutting out a plurality of clamp members from a single plate using a wire-cut electric discharge machine, the optimum length is selected from the shape lines of the plurality of clamp members, and these are used as a common machining line. The present invention relates to a processing line setting method that makes it possible to efficiently cut out clamp members by setting processing lines for each clamp member on a plate material.

-C, for structures such as vehicles, a process is adopted in which plate-like members such as sheet metal are processed according to the shape curved surface of each part, such as doors and fenders, and then the plate-like members that make up each part are assembled by welding. are doing.

Therefore, when attempting to weld the plate-like members using a robot or the like, it is necessary to accurately position these plate-like members using a clamp jig. Here, the clamp jig performs positioning by clamping a plurality of locations on the plate-shaped member with each pair of clamp members, and each clamp member is specified so as not to interfere with the plate-shaped member when clamping. It shall be in the shape of

On the other hand, in recent years, CAD (computer-aided design system) using computers has become popular, and the shape of the clamp member can be automatically calculated from the shape data of the plate-like member to be clamped using this CAD. It is.

In this case, the desired clamp member can be created by driving the NC machine tool based on the shape data of the clamp member determined by the CAD.

By the way, a wire-cut electrical discharge machine is usually used as an NC machine tool for creating the clamp member. This wire force/node electrical discharge machine creates an electrical discharge phenomenon between the wire and the plate material, fuses the plate material, and cuts out the product, and is said to be able to create parts with complex shapes with high precision. It has advantages. However, on the other hand, it has the disadvantage of slow processing speed.

Here, the machining time by the wire-cut electric discharge machine depends on the substantial length of the machining path. Therefore, when cutting out only one member from one sheet of plate material, it is relatively easy to set the machining path so that the machining time is the shortest.

However, when cutting multiple parts from a single plate, it is extremely difficult to set the machining line so that the actual machining path is the shortest, and depending on how it is set, machining efficiency can drop significantly. This causes the inconvenience of doing so.

The present invention has been made in order to overcome the above-mentioned disadvantages, and when cutting out a plurality of members from one plate material, the optimum lengths are selected from the shape lines of the plurality of members, and these members are cut out. By setting the machining line of each member on the plate material so that the common machining line is used, it is possible to shorten the actual machining path as much as possible and perform the work of cutting out the parts extremely efficiently. The purpose of this invention is to provide a method for setting machining lines.

In order to achieve the above object, the present invention, when cutting out a plurality of members from one plate material, the longest first shape line consisting of one or two straight lines from the shape line of the plurality of members. a first step of selecting a portion; and a second step of selecting a second shape line portion that is the longest and is composed of one or two straight lines from the shape lines of a member other than the member including the first shape line portion. and joining the first shape line portion and the second shape line portion and setting a processing line on the plate material, which is formed by the shape line of two members including the first and second shape line portions. Third
and setting processing lines made of the shape lines of the plurality of members on the plate material by repeating the first to third steps while considering the two members as one member. Features.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a clamp jig 1o that clamps and joins a workpiece WI and a workpiece W2 that constitute a structure such as a vehicle, and positions them for welding or the like. This clamp jig 10 is configured to be movable via an arm member 12, and includes a pair of cylinders 14 and 16 fixed to the tip of the arm member 12, and support members 18 and 2 attached to the cylinder 14.16.
The clamp member 22c includes clamp members 22a and 22b rotatably attached to the support member 2o via the support member 2o. Note that the clamp members 22a and 22b
includes cylinder rods 24 and 2 of cylinder 14.16.
6 are connected respectively.

Here, the clamp members 22a to 22c are manufactured using the processing line setting method according to the present invention, and the work W,
, W2 are positioned.

That is, when the cylinder rods 24, 26 are displaced in the direction of the arrow under the driving action of the cylinders 14 and 16, the clamp members 22a and 22b are moved in the direction of the arrow about the fulcrum of the support member 18, 20 from the position indicated by the two-dot chain line. Rotate. As a result, the workpieces W, , W2 are attached to the clamp member 22
It is held between the tip of the clamp member 22b and the tip of the clamp member 22b, and is also held and positioned between the tip of the clamp member 22c and the intermediate portion of the clamp member 22b.

Next, in this state, welding work is performed on the works W, , W2.

By the way, the clamp members 22a to 22c that position the workpieces WI and Wz in this manner have various shapes that do not interfere with the workpieces W, , W2 depending on the parts to be clamped, and are usually clamped on a single plate. It is created using a wire-cut electric discharge machine based on the set machining line.

Next, a process for manufacturing a clamp member using the processing line setting method according to the present invention will be described.

In this case, the shape of the ramp member required for positioning the workpieces W, W2 can be determined by CAD from the shape data of the workpieces W2. Therefore, CA
Clamping members A to F shown in FIGS. 2a to f by D
is required.

Next, from the data of the shape lines composing each lamp member A to F, the longest straight line part X parallel to the X axis, the longest straight part Y parallel to the y axis, and the longest straight line Find the concave portion M that is the longest as a sum of two orthogonal straight lines (see Fig. 2 a and b). In addition,
The shape of the concave portion is selected so that the concave portion is not formed by a straight line of the third adjacent grain.

For example, in the case of clamp member B, Σ3.
>Σ11I (n, m=l, 2.3·), the value of Y shown in FIG. 2 shall be set as the longest straight line portion parallel to the y-axis.

Examples of the values of X, Y, L, and M for each of the lamp members A to F determined in this way are shown in the following table.

Next, the maximum value is determined from among X, Y, L, and M determined in the above steps. Furthermore, X, Y, in a clamp member other than the clamp member including the shape line having the maximum value
Find the maximum values of L and M. Then, the shape lines of the clamp members having these maximum values are joined together, and a processing line consisting of the shape lines of the two clamp members is set on a predetermined plate material. Hereinafter, the two clamp members are regarded as one clamp member and the same operation is repeated to set the machining lines of all the clamp members A to F on the plate material.

Here, the above steps will be specifically explained based on the above table.

Shape lines X, Y, L and M of clamp members A to F
Among them, the largest one is M (=12) of the clamp member E. In this case, M indicates a convex portion, and this convex portion includes L
It is thought that the concave portion shown by is corresponding. Therefore, first, from the clamp members A to F other than the clamp member E, the one with the maximum L is determined. In this case, L (=5) of the clamp member B is the maximum. Therefore, when the shape line corresponding to M of the clamp member E and the shape line corresponding to L of the clamp member B are joined, the length of the joined portion becomes 5.

On the other hand, X of the shape line of clamp member E is 7, and if you search for the shape line of clamp members A to F other than clamp member E to find the one with the maximum X or Y, you will find that the shape line of clamp member E is X (- 6) is the maximum. Therefore, when the shape line of X in clamp member E and the shape line of X in clamp member R are joined, the length of the joined part is 6, and the shape line corresponding to M of clamp member The joined portion becomes longer than when the shape line corresponding to L is joined. Therefore, as shown in FIG. 3, the X shape line of the clamp member E is
Join the shape lines of.

Here, if there are multiple combinations in which the length of the joint part is the same, the clamp member and E
A combination is selected that minimizes the area of the right-angled quadrilateral 28 that includes .

Next, it is determined whether or not the right-angled quadrilateral 28 is included in the effective machining range 32 set for the plate material 30 shown in FIG. 4, and if it is included, the clamp member shown in FIG. After setting the shape line E as a processing line on the plate material 30, the process moves on to setting the next processing line. On the other hand, if the area is not within the effective machining range 32, the right quadrilateral 28 shown in FIG. After the line is set, the process moves on to setting the next processing line.If the line is not included, the process returns to the first process and a combination with other clamp members is determined.

Next, when the right-angled quadrilateral 28 is included within the effective machining range 32 of the plate material 30, the clamp member E shown in FIG. 3 is regarded as one clamp member G, and After newly finding XSY, L, and M, the same operation is repeated. FIG. 4 shows processing lines of clamp members A to F set on the plate material 30 by repeating the above operations.

Next, the clamp members A to F are cut out from the plate material 30 using a wire-cut electrical discharge machine. in this case,
The wire-cut electric discharge machine starts cutting the plate material 30 from the initial hole 34 shown in FIG. 4 in the direction of the arrow at a relatively low machining speed V.

Here, the cutting direction of each clamp member A to F with respect to the processing line by the wire cut electrical discharge machine is set counterclockwise, and the moving path from one clamp member that has been cut to the next clamp member to be cut is is set clockwise with respect to the machining line of each of the clamp members A to F.

Therefore, the wire-cut electric discharge machine has an initial hole of 3.
4, the cutting operation of the plate material 30 is started at the processing speed V, and first, the processing line of the clamp member B is cut counterclockwise along the broken line. In this case, the wire-cut electric discharge machine cuts the machining line of clamp member B, and at the same time cuts the machining line of clamp member B.
Also cut the processing lines E.

Next, when the cutting process of the clamp member B is completed, the wire cut electrical discharge machine moves the processing line of the clamp member B, which has been cut, in a clockwise direction along the dashed line at a fast forwarding speed of V.
(V>v) and moves to the cutting start point of the next clamp member C. Hereinafter, as shown in FIG. 4, clamp members C,
D.

The cutting operation is performed along the processing line in the order of E, A, and F.

When the cutting operation is completed, each of the clamp members A to F is removed from the plate material 30 and mounted on the clamp jig 10 shown in FIG. 1, and the workpiece W2 is clamped and positioned.

As described above, according to the present invention, when cutting out a plurality of members from one plate material, the longest shape line portion consisting of one or two straight lines from the shape line of the plurality of members and the longest Select the shape line part and the shape line part with the next length, set the machining lines of the two members on the plate material so that these become a common machining line, and then cut the two members into one
The machining lines for each member are set on the plate material by repeating the same operations while treating each member as a single member. Therefore, when cutting out one part from a plate, part of the processing line of other parts is effectively cut, thus reducing the time required to cut out multiple parts from a plate, making it more efficient. Can perform processing work. In this case, it is particularly effective for machine tools with relatively slow machining speeds, such as wire-cut electrical discharge machines.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to this embodiment. Of course, various improvements and changes in design are possible within the scope.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a clamp jig with a clamp member attached, FIGS. 2 a to f are plan views showing the shape of a clamp member manufactured using the processing line setting method according to the present invention, and FIG. Explanatory diagram of the machining line setting method according to the present invention. FIG. 4 is a diagram showing machining line setting of a clamp member set on a plate material using the machining line setting method according to the present invention. 10... Clamp jig 22a-22c... Clamp member 30... Plate material A-G... Clamp member FIG, 1

Claims (3)

[Claims] (1) When cutting out a plurality of members from one plate material, a first step of selecting the longest first shape line portion consisting of one or two straight lines from the shape lines of the plurality of members; , 1 from the shape line of the member other than the member including the first shape line portion
a second step of selecting the longest second shape line portion consisting of a book or two straight lines; and a step of joining the first shape line portion and the second shape line portion to form the first and second shape line portions. a third step of setting a processing line consisting of the shape lines of two members including two shape line portions on the plate material, and the first to third A processing line setting method characterized in that a processing line consisting of the shape lines of the plurality of members is set on the plate material by repeating the steps. (2) In the method according to claim 1, the first
If the shape line part is a concave part made up of two straight lines, a convex part made of one straight line or two straight lines can be used as the second shape line part that joins the first shape line part. How to set the machining line. (3) In the method according to claim 1, the first
2 formed by joining the shape line portion and the second shape line portion
If the shape line of one member exceeds the effective machining range of the plate material,
A machining line setting method comprising selecting another member including a shape line having a length second to that of the second shape line portion in a second step.