JPH07115092B2 - Mold change system - Google Patents

Description

Description: (Industrial field of application) The present invention relates to a die exchange system used for automatically exchanging a die of a press line having a plurality of steps line by line.

(Prior Art) For products that require multiple pressing processes, use a press machine in which a plurality of press machines are installed side by side or a press machine in which a plurality of press processing stations are provided in one machine, and press work on the work. Was there.

In the former, it is necessary to arrange a worker in each press machine, and the installation space required for arranging the press machines in parallel is extremely large. Therefore, the latter is often used.

The latter is so-called tandem press or transfer press, and is widely known in general (see JP-A-57-85699 and JP-A-58-145396).

By the way, when a plurality of types of works are subjected to a plurality of pressing steps to make products, a die corresponding to the type of the work (product) must be attached to each step of the press line.
That is, after the machining of a certain work is completed, it is necessary to collectively replace the die used for the next work to be produced with the die currently used in line units.

JP-A-57-8899 is one of the devices for exchanging the press die.
Some are disclosed in Japanese Patent Publication No. 7. The device disclosed in this publication has a bolster protruding from the press body,
A parallel rail is provided at the rear end of the trolley, and a trolley that accommodates two sets of dies with two different dies mounted therein is arranged so that it can travel, and two sets of dies or die sets are selected according to the work. Then, the dolly is run on a press machine. As a result, the worker replaces the currently used mold with a mold for processing the work to be processed next. This type of press line often uses molds commonly for different kinds of works, and each time the work changes, the worker decides whether to continue using the mold currently used. Based on the judgment, the worker continued to use or replace the die of each press machine.

(Problems to be solved by the invention) However, it is determined whether or not the mold of each press machine currently used for the machining work is continuously used for the next machining work, and the mold selection for the mold replacement is performed. Each time the work was changed, the worker performed each press machine, which required a lot of time, and an error occurred in the combination of the dies in the press line. Therefore, the downtime of the equipment tends to be long, which causes a problem that the operating rate is reduced and the productivity is reduced.

Therefore, the present invention provides a system for accurately and promptly exchanging dies for the entire press line according to various kinds of works.

(Means for Solving Problems) In order to solve the above problems, the present invention provides a control unit having a common mold database for each press process according to a plurality of types of workpieces, in which each press process of the current processing operation is performed. After reading the signal indicating the type of the die in the above step and the signal indicating the type of the die prepared in each press step of the next processing operation, both signals indicating the type of the current and next processing operations. And the common mold database, the control unit judges whether or not the mold should be replaced in the next processing work, and when the judgment requires the mold to be replaced thereafter, the pressing machine of each step is provided with the mold. It is characterized by instructing a signal indicating the necessity of mold replacement and a signal indicating the condition of mold preparation for the next processing work.

(Operation) The control unit that reads both signals indicating the types of the die in each press step of the current machining operation and the die prepared in each press step of the next machining operation When it is determined whether or not the mold needs to be replaced, and if the content of the determination requires that the mold be replaced, a signal indicating that the mold needs to be replaced and a signal indicating whether or not the mold has been properly prepared for the next machining operation are displayed. Command the press machine in each process.

As a result, it becomes possible to automatically determine whether or not to use the die of each press machine used for the current machining work for the next machining work and to select the mold for die replacement. .

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 shows an example of a die press line used for carrying out the system of the present invention.
The die press line 1 is composed of an operation unit 2, a control unit 3, a first press machine 4 and a second press machine 5. The die press line 1 is composed of a plurality of pressing steps, and is used to press a plurality of types of works.

Therefore, as shown in FIG. 2, the second press machine 5 is arranged in the subsequent process of the first press machine 4. 6 is a work supply unit, 7 is a loader, 8 is a transfer unit, 9 is an unloader, and 10 is a pallet supply unit.

Although this embodiment shows an example of a die press line consisting of two steps, it goes without saying that it may be constructed by three or more steps.

The operation unit 2 includes a keyboard or the like, and is used to operate the control unit 3 from the outside.

The control unit 3 is a well-known microcomputer installed in the presses 4 and 5 in each process, and determines whether or not to change the mold according to the type of work and the metal based on the information of the relay box 14 described later. This is to instruct the press machines 4 and 5 in each process of the ready state of the mold. A common mold database 11 as shown in FIG. 4 is stored in the memory (not shown) of the control unit 3.

This common mold database 11 corresponds to molds that can be commonly used among a plurality of types of works according to the press machines 4 and 5. For example, the first die used in the first press step and the first press machine 4 can be commonly used for the work 1 and the work 8, and the first die used in the second press machine 5 can be used. It indicates that the second mold can be used in common for the work 2 and the work 4.

In addition, in the above memory, as shown in FIG.
5 Another mold database 12 is stored.

Further, the above-mentioned memory is provided with a mold replacement determination program 13 described later (see FIG. 7).

14 and 14 are relay boxes, and the relay boxes 14 and 14 send both signals representing the mold used in each press machine 4 and 5 and the mold prepared for use in the next processing. It is intended to be read by. The relay box 4 has the configuration shown in FIG. 5, is composed of connection terminals 16, 16 ..., Signal lines 17, 17 ... And limit switches 18, and has carriers 19,2 shown in FIG.
Prepared for 0. The signal lines 17, 17 ... (S _{1 to} S ₆ , P) are connected to the control unit 3. C is a common line, P is a parity bit signal line, and S _{1 to} S ₆ are signal lines. Thus, the symbol corresponding to the mold number is represented by a short circuit of the common line C and the signal lines S ₁ to S _6. For example, the symbols representing the mold numbers will be described with reference to FIG. The parity in FIG. 5 is even.

In the figure, the common line C is connected to the signal lines S ₁ , S ₃ and S ₅ , so the control unit 3 obtains 6-bit information. That is, binary information “010101” (decimal 21) is obtained. On the other hand, since the parity is even, the parity bit signal line P is short-circuited to the common line C.

The carriers 19 and 20 shown in FIG. 3 are for positioning the mold before press working, and for preparing by moving in and out of the press machines 4 and 5, and fixing the lower mold during press working (upper). The mold is fixed to the press ram). Further, during the press working, a die corresponding to the work for working the next work is placed on the carriers 19 and 20 to prepare for the next work.

Using the press line 1 having the above-mentioned configuration, the system of the present invention will be described below based on the mold determination program 13. In FIG. 3, reference numeral 10 denotes a carrier on which a die (hereinafter, referred to as “current die”) for performing press working on the currently processed work is placed, and 20 performs press working on the next work to be processed. Each of the carriers has a die (hereinafter referred to as "next die") for mounting. In addition, the example described below is only for the first press machine 4, and in reality, the necessity of die replacement is simultaneously determined for a plurality of press machines 4 and 5.

In the die determination program 13, A is the work number of the work to be machined next, B is the current die symbol, and C is the next die symbol.

The numbers and the like used in the mold determination program 13 in FIG. 7 are based on the common mold database 11 in FIG. 4, and for example, (b) to (e) in the detection determination program 13 described later. Is the individual work 1,
This shows that the mold numbers 1,2,13,15 corresponding to 2,3,8,13,14,15,20 were searched using specific numbers. Hereafter, similarly, a mold judgment program using specific numbers etc.
13 are explained.

First, after operating the operation unit 2 to execute the mold determination program 13 of the control unit 3, when the work number A of the work to be processed next is input by the operation unit 2 in (a), the control unit 3 The work number A is stored in a memory (not shown).

Next, in (b) to (e), the control unit 3 compares the work number A in the memory with the common mold database 11. Here, when the work number A in the memory is not in the common mold database 11, the control unit determines that the work number does not correspond to (F), determines an abnormality, and issues an alarm to the first press machine 4 to notify the abnormality. Display it. Further, when the work number A of the memory is in the common mold database 11, (g) to (g)
Then, the control unit 3 reads the die number corresponding to the work number A,
Based on the mold database 12, the symbol of the mold corresponding to the work number A is searched, and the symbol of the mold (parity bit omitted in the figure) is stored in the memory. Then, in (L) to (F), the control unit 3 reads the current model symbol B from the relay box 14 mounted on the carrier 19 together with the current model through the signal line 17. Subsequently, in (Yo) to (So), the control unit 3 compares the current model symbol B read from the relay box 14 with the symbol of the mold stored in the above (T) to (N) in the memory. .
As a result, when the two coincide with each other, the control unit 3 determines that the next workpiece to be machined does not need to be replaced,
If they do not match (N), the control unit 3 determines that the die for the next workpiece to be machined needs to be replaced.
Displayed on the press machine 4.

Then, the control unit 3 reads the next type symbol C of the next type prepared on the carrier 20 for the work to be processed next from the relay box 14 through the signal line. Subsequently, in (ヰ) to (KU), the control unit 3 displays the mold symbol stored in the memory in (TO) to (NU) and the above (NA).
The next type symbol C read in (c) is compared. Here, when the two match, the control unit 3 causes the first press to display that the next die is ready in (Y),
If the two do not match, it is determined in (m) that the next mold is not ready and the first press machine 4 is caused to display an abnormality.

(Effects of the Invention) Since the present invention is configured as described above, the necessity of die replacement and the next die preparation state associated with the work change are automatically determined for each process collectively for the entire press line. Can be displayed with.

Therefore, the die of the press can be replaced accurately and quickly, and the time for stopping the press machine is shortened. As a result, the facility operation rate was improved and the productivity was improved.

Further, since the error of die replacement is reduced, the reliability of the product is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the structure of a press line for carrying out the system of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a view showing the press machine of FIG. Partial cross-sectional view, FIG. 4 is a diagram showing a common mold database of the control unit of FIG. 1, FIG. 5 is a wiring diagram showing the structure of the relay box of FIG. 1, and FIG. 6 is control of FIG. FIG. 7 is a diagram showing a mold database included in the unit, and FIG. 7 is a flow chart showing a mold determination program stored in the control unit of FIG. 1 ... Mold press line, 3 ... Control unit

Front Page Continuation (72) Inventor Tomomi Kishi 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Koshi Nonami 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd.

Claims (1)

[Claims] 1. In a press line comprising a plurality of pressing processes and individually pressing a plurality of types of works, a control unit having a common mold database for each pressing process corresponding to a plurality of types of works is currently used. After reading the signal indicating the type of the mold in each press step of the machining operation and the signal indicating the type of the mold prepared in each press step of the next machining operation, the molds of the current and next machining operations are read. Based on both signals indicating the type of the mold and the common mold database, the control unit determines whether or not the mold needs to be replaced in the next machining operation. The die change system, which issues a signal indicating the necessity of die change and a signal indicating the state of die preparation for the next processing work to the press machine.