JPH09107197A - How to determine the parts arrangement - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a method for determining a component arrangement capable of improving the production efficiency of a mounting machine for high-mix low-volume production. SOLUTION: All parts used in boards of all product types are listed, and for these parts, commonality of parts used between boards of each product type is sought, and the commonality level of the parts is changed to a common part. The common parts are classified into non-common parts, and the common parts are assigned to the priority arrangement positions of the component supply unit, and the arrangement positions are fixedly given to these common parts so as to be the same positions through the mounting work of the boards of all kinds, on the other hand, Allocating the non-common parts to the non-priority array positions of the part supply unit, and individually giving the array positions to these non-common parts so as to be the positions corresponding to each board of each type, and determining the part array position. Is characterized by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the arrangement position of supply parts in a mounting machine for high-mix low-volume production.

[0002]

2. Description of the Related Art In recent years, in a production line for mounting components on a printed circuit board, the production of a large number of various types of printed circuit boards is increasing. Therefore, in the production line, it is required to improve the total production efficiency in terms of both the mounting time of the parts and the switching time of the type of the printed circuit board, and various proposals have been made for each mounting machine. .

As a mounting machine for mounting parts on such a large number of various kinds of printed circuit boards, a mounting machine having a structure shown in FIG. 3 is known. The operation of the mounting machine will be described below with reference to FIGS.

A mounting machine 1 shown in FIG. 3 has a component supply section 5 having line-shaped arrangement positions (Z1, Z2, Z3, ...) Of components Z, and a mounting head for performing a fixing operation for sucking and mounting the components. 4 and a table 2 for positioning the printed circuit board 3 movably in the XY directions.

Each component Z of the component supply unit 5 has a degree of freedom only in the direction shown by the arrow in the figure. In this component arrangement position, the Z1 position is the arrangement position having the highest priority. That is, the priority arrangement position of the parts is from the Z1 side to Z
2, Z3 ... are decided in sequence. And Z1
Each part is assigned in order from the position, and up to the necessary arrangement position is used.

Therefore, in the sucking and mounting operation of the component Z of the mounting head 4 performed between the fixed positions, first, the component supply unit 5 moves and the component Z of the component supply unit 5 located on the position of the mounting head 4 moves the mounting head. Adsorbed at 4. Next, the mounting head 4
The component Z adsorbed on the surface of the printed circuit board 3 set on the movable table 2 is mounted.

Here, the production order of each product type is assigned from product type 1 to product type 4 in descending order of production amount according to the number of substrates to be produced. Production is being carried out for 3 and 4 types.

The component arrangement of the mounting components of the mounting machine configured as described above is determined according to the flow shown in FIG.
First, one of the N kinds of printed circuit boards is selected (step 1). A list of used parts used for this type (N = 1) of printed circuit boards is created (step 2).

The parts in the list are distributed to the respective mounting machines on the mounting line (step 3). This sorting work is divided into, for example, a component having a small shape and a component having a large shape, and a component having a high mounting speed and a component having a slow mounting speed. In step 4, the arrangement of the components distributed to each mounting machine is determined.

In this arrangement, each component is assigned to the component supply unit so that the mounting time of the mounting machine is minimized. After that, the same process is repeated for the next type (N = 2) of printed circuit boards, and finally, the allocation and arrangement of the components are determined for all types of printed circuit boards (step 5).

As described above, the component arrangement is individually determined for each type of printed circuit board, and for example, the mounting machine name M shown in FIG.
V-1 and MV-2 parts supply arrays Z1, Z2, Z3.
.. are assigned parts (names indicated by ab, aa, ... In the figure) for four types of printed circuit boards (types 1 to 4).

The above is the method of determining the arrangement of the parts by the flow shown in FIG. 4, but in addition to the above, the method shown in FIG. 6 is also known as a method of determining the arrangement.

In the flow shown in FIG. 6, first, in step 1, a list of all parts used in all printed boards (all types) is created. Then, the parts on the list are distributed to the respective mounting machines on the mounting line (step 2). This sorting work is performed by, for example, sorting all parts in order from smallest to largest, or from those with the fastest mounting speed to those with the slowest mounting speed. Are evenly distributed so that In step 3, the array of distributed components is assigned to the component supply unit of each mounting machine.

This arrangement is common to all types of printed circuit boards, and mounting machine names MV-1 and MV- shown in FIG.
All the component names of the four types of printed circuit boards (types 1 to 4) are assigned to each of the component supply arrays Z1, Z2 ,.

[0015]

In the above-mentioned conventional method for determining a component arrangement, in the method shown in FIG. 4, it is necessary to exchange the arrangement of the component supply unit when changing the type of the printed circuit board, which requires a type change time. Therefore, there is a problem that production efficiency is reduced in high-mix low-volume production.

On the other hand, in the method of FIG. 6, it is not necessary to change the arrangement of the component supply unit even if the product type is switched, but the components not used in a specific product type are set, and the arrangement is not necessarily suitable and the mounting of the component is not always done. In the operation, there is a problem that the production efficiency is reduced by the increase in the number of mounted components on the printed circuit board due to the movement loss of the component supply unit. Furthermore, when the number of types of components exceeds the maximum number of component supply units of all mounting machines, there is a problem that the components cannot be fully loaded in the component supply units.

Therefore, in a mounting machine for high-mix low-volume production, there has been a demand for a method of solving the problems of the above-mentioned conventional example and determining the arrangement position of the components for improving the production efficiency.

It is an object of the present invention to solve the above problems and to provide a method for determining a component arrangement for high-mix low-volume production that improves the total production efficiency of a mounting line for mounting components on printed circuit boards of different types. To do.

[0019]

In order to solve the problems of the above-mentioned conventional example, the present invention mounts the components set in the component arrangement position in which the priority order is determined, to the predetermined positions on the board in the priority order. At the same time, in the method of determining the component arrangement in a mounting machine in which a plurality of boards of a plurality of types are sequentially supplied, a list of all the components used in the boards of all types is provided. In order to find the commonality of the parts used in, the common level of the parts is classified into common parts and non-common parts, and the above common parts are assigned to the priority arrangement position of the part supply unit, and all common product types are assigned to these common parts. Arrangement positions are fixedly provided so as to be the same position through the board mounting work, while the above-mentioned non-common parts are assigned to non-priority arrangement positions of the component supply section, and each product type is paired to these non-common parts. The sequence position so that the position of giving individually, and determines a component arrangement position.

In the present invention, it is preferable that the priority order of the arrangement positions in the common parts is determined by considering the commonality level and giving priority to the one having the higher commonality level.

Further, in the present invention, it is preferable that the priority order of the arrangement positions in the non-common parts is determined by giving priority to the parts in the continuous production relationship in consideration of the continuous production relationship of the boards of each type.

The present invention having the above-described structure can perform the following operations. That is, the commonality level of the parts is classified into common parts and non-common parts, and the arrangement positions of the common parts are determined so as to be sequentially contiguous from the priority arrangement position of the component supply unit. Arrangement positions are fixedly provided so as to be the same position through the mounting work of all types of boards, while non-priority arrangement positions of the component supply unit are given to the arrangement positions of the non-common parts, and these non-common parts are given different types. Since the array positions are individually given so as to be the positions corresponding to each board of, even in the mounting machine of the high-mix low-volume production, common parts having commonality are grouped into the priority array position, The array position can be occupied, it is not necessary to switch the parts, and the switching loss can be prevented as a whole. As a result, it is possible to improve the production efficiency of the mounting machine as a whole. That.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention.

The mounting machine 1 shown in FIG. 3 absorbs the components Z at a constant suction position S, and a component supply section 5 having lined arrangement positions (Z1, Z2, Z3, ...) Of the components Z. A mounting head 4 that performs a fixing operation for mounting the component Z at a fixed mounting position M, and a movable table 2 that positions the printed circuit board 3 movably in the XY directions are provided.

Each component Z of the component supply unit 5 has a degree of freedom only in the direction shown by the arrow in the figure. In this component arrangement position, the Z1 position is the arrangement position having the highest priority. That is, the priority arrangement position of the parts is from the Z1 side to Z
2, Z3 ... are decided in sequence. And Z1
Each part is assigned in order from the position, and up to the necessary arrangement position is used.

Therefore, in the suction and mounting operation of the component Z of the mounting head 4 performed between the fixed positions, first, the component supply unit 5 moves and the component Z at the array position on the suction position S is sucked by the mounting head 4. To be done.

Next, the mounting head 4 moves the sucked component Z onto the mounting position M, and mounts it on the mounting point positioned in the XY directions of the printed circuit board 3 set on the freely movable table 2. doing.

The mounting line on which the mounting machine 1 configured as described above is arranged includes two mounting machines MV-1 and MV-2 having the same characteristics, and each mounting machine is operated between fixed positions. The component Z is mounted on the four types of printed circuit boards 3 (models 1 to 4) by the suction and mounting operation of the components of the mounting head 4. Here, each product type is sequentially assigned to the product type 1 to the product type 4 in descending order of the production amount according to the number of boards to be produced. Then, production is successively performed from the product type 1 to the product type 2, the product type 3, and the product type 4.

FIG. 1 shows the method of determining the component arrangement of the mounting machine 1.
The description will be made according to the flow of FIG. The numbers 1 to 7 shown in FIG. 1 indicate the respective process numbers, and in the first process indicated by 1, a list of all parts used for all printed circuit boards (all types) is created. This list includes data such as printed circuit board product names, component names, the number of components, and mounting speed.

In the second step, the commonality of parts between the printed boards is checked from the parts list. Here, the commonality is determined by whether or not the parts are frequently used in common among the printed boards of four kinds (kinds 1 to 4).

In the third step, the parts are classified based on the commonality. This classification is performed by classifying into two types, a component that has reached a preset commonality level is a common component and another component is a non-common component. In the present embodiment, parts commonly used in three or more commonality levels are common parts, and other parts are non-common parts.

The fourth step is to mount two component mounters MV-1,
In the process of allocating to MV-2 (both of which have the same characteristics in this embodiment), the one having a high mounting speed (mounting time 0.14 s)
ec) group and slower (wearing time 0.25se
c), and the one with a fast wearing speed is given priority to MV-1
The mounting time of the two mounting machines is made uniform based on the mounting time and the number of parts. As a result, as shown in FIG. 2, the mounting time was 0.14 sec for the MV-1.
In the MV-2, two groups of parts having a mounting time of 0.14 sec and a mounting time of 0.25 sec are distributed. In addition, in general, after the special parts are sorted in consideration of the characteristics of the mounting machine, for example, the parts are sorted in order from the smallest to the largest shape, or from the fastest to the slowest mounting speed. Further, the mounting time of each mounting machine is calculated for each type of printed circuit board, and the mounting time is distributed to each mounting machine so that the mounting time can be balanced regardless of the type of printed circuit board.

In the fifth step, the parts distributed to each mounting machine are grouped according to the mounting speed and commonality of the parts. As shown in FIG. 2, in MV-1, the common component A ₁ is assigned to the group having the higher priority and the non-common components B _{1 and} C _{1 are} assigned.
Are divided into lower priority groups, and in the MV-2, the parts having a mounting speed of 0.14 sec and the common part A
₂ is the first priority group, the non-common parts C ₂ is the second priority group, the mounting speed is 0.25 sec, the common part A ₃ is the third priority, and the non-common parts B _{2 and} C ₃ are the second priority groups. Four
Grouped as a priority.

The sixth step is a step of deciding the arrangement of the common parts classified according to the above-mentioned commonality level. In the sixth step, the parts arrangement relating to the common parts in each group roughly classified in the fifth step is mounted. Priority of the target board type (type 1
Determined based on product type 4).

Then, in step 6b, the groups whose arrangements have been determined in step 6a are sequentially arranged at the priority arrangement positions according to the number of mounted parts.

The arrangement order in each group indicated by A1, A2, and A3 in FIG. 2 indicates the arrangement of the common parts determined in the sixth step. And these common parts A1, A2, A
As shown in FIG. 2, the components belonging to the group No. 3 are fixedly assigned the component supply unit numbers, and all types of substrates (type 1
-Parts are not replaced through the mounting operation for the product 4).

Next, the seventh step is a step of determining the arrangement of the parts classified into the non-common parts having low commonality. As shown in FIG. 2, the parts belonging to the group of the non-common parts B ₁ , C ₁ , C ₂ , B ₂ , and C ₃ are not fixedly assigned to the parts supply unit number, and are to be mounted. Naru board (type 1
It is given according to product type 4), and parts are replaced at the time indicated by * in Fig. 2. In the 7a step, the array positions are assigned by giving priority to the parts belonging to the group of the parts B _{1 and} B ₂ which are continuously used between the boards of different types.

The products 1 to 4 shown in FIG. 2 are assigned to products 4 in order from product 1 with priority given to products having a large number of products.
Since production is carried out in order from product type 1 to product type 2, product type 2 to product type 3, and product type 3 to product type 4, for example, MV
-1 is assigned preferentially to non-common parts having a continuous relationship in the range indicated by B1 in FIG. The parts ca used in the boards of type 1 and type 2 whose production sequence is continuous are
Except for the array position occupied by common parts through the sixth step,
It is assigned to the component supply position Z5 of the next highest mounting machine MV-1. Product type 2 with continuous production sequence
And the component dd used on the board of the product type 3 is assigned to the arrangement position Z6 of the next priority, and for the component bf, Z
No. 5 is allocated to the vacant portion, and further, part ea is allocated to Z7.

In the next 7b step, the arrangement of the non-common parts and the parts belonging to the group of the parts C _1, C _{2 and} C ₃ which are not continuous in the production sequence is set to the occupied array positions of the common parts and the continuous parts. All are laid out in the order of being mounted in the product types 1 to 4 to blank array positions except for. B1 and C of FIG.
The parts cb, ad and ae shown in the range of 1 indicate the allocation. That is, since the components cb and ad are the components used in the product type 1, in the descending order of the number of mounted products, the blanks below the highest priority are excluded from the array Z1 position of the product type 1 except the occupied array position of the common component. Array position Z
6 and Z7 are sequentially assigned. Since the component ae is also a component used in the product type 3, it is assigned to the position Z8 which is the highest priority array of the product type 3.

On the other hand, also in the mounting machine MV-2,
First, the parts bc of the group whose mounting speed is 0.14 sec,
bd is allocated to the blank arrangement position Z3 of the product type 1 and the product type 2 which are used, respectively, and then the mounting speed is 0.
Similarly, the 25 sec group is also assigned in the order of blank arrangement positions Z7, Z6, and Z7 in the same group of the types in which the components cf, ce, and da are used.

The arrangement positions of the parts shown in FIG. 2 obtained through the above steps 1 to 7 are compared with those of the conventional example shown in FIG.
The number of parts switching can be significantly reduced (6 times as indicated by * in Fig. 2), and the parts switching loss can be reduced.

[0042]

According to the present invention, it is possible to reduce the product type switching loss of a mounting machine that mounts components on different types of printed circuit boards and improve the production efficiency.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a data diagram showing the component arrangement.

FIG. 3 is a configuration diagram showing a mounting machine.

FIG. 4 is a flowchart showing a first conventional example.

FIG. 5 is a data diagram showing the component arrangement.

FIG. 6 is a flowchart showing a second conventional example.

FIG. 7 is a data diagram showing the component arrangement.

[Explanation of symbols]

 1 Mounting Machine 2 Movable Table 3 Printed Circuit Board 4 Mounting Head 5 Component Supply Section Z Component

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Masuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kenichi Sato, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A mounting machine in which components set in component arrangement positions having a predetermined priority order are mounted at predetermined positions on a board in order of priority and a plurality of boards of a plurality of types are sequentially supplied by a predetermined number. In the method of determining the component arrangement, list all the components used in all types of boards, find the commonality of the components used in each type of board, and calculate the commonality level of the components. Classify into common parts and non-common parts, assign the above-mentioned common parts to the priority arrangement position of the component supply unit, and give these common parts a fixed arrangement position so that they will be in the same position through the mounting work of the boards of all types. On the other hand, the non-common parts are assigned to the non-priority array positions of the component supply unit, and the array positions are individually given to these non-common parts so as to be the positions corresponding to each board of each type, and the component array position is determined. Method of determining the part sequence and determining the. 2. The method for determining a component arrangement according to claim 1, wherein the arrangement positions in the common components are determined in priority by considering the commonality level and giving priority to those having a high commonality level. . 3. The order of priority of array positions in non-common parts,
3. The method for determining a component arrangement according to claim 1, wherein the components in the continuous production relationship are prioritized and determined in consideration of the continuous production relationship of the boards of each type.