JP2005057300A - Method of determining arrangement of parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of determining the arrangement of parts capable of improving the production efficiency of a mounting machine in multiproduct and small-quantity production. <P>SOLUTION: All parts used for all kinds of substrates are listed up, and classified into common parts and non-common parts depending on whether the number of kinds of the parts is larger than the preset number of commonly used kinds, the common parts are allocated to priority arrangement positions of a part supply section, the arrangement positions are stationarily given to these common parts so as to allow the common parts to be positioned at the same positions by the mounting work of all kinds of the substrates. The non-common parts are allocated to non-priority arrangement positions of the part supply section, however, the arrangement positions are individually given to these non-common parts so as to allow the non-common parts to be positioned at positions corresponding to those by each kind of the substrates, to determine the part arrangement positions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for determining an arrangement position of supply parts in a mounting machine for high-mix low-volume production.

  In recent years, in a production line for mounting components on a printed circuit board, production of a large variety of small-sized printed circuit boards is increasing. Therefore, in the production line, it is required to improve the total production efficiency from the viewpoint of shortening the mounting time of parts and shortening the time for switching the type of printed circuit boards, and various proposals have been made for each mounting machine. .

  As a mounting machine for mounting components onto such a small variety of printed circuit boards, one having a configuration shown in FIG. 3 is known. Hereinafter, the operation of the mounting machine will be described with reference to FIGS.

  The mounting machine 1 shown in FIG. 3 includes a component supply unit 5 that has the arrangement positions (Z1, Z2, Z3,...) Of components Z in a line, a mounting head 4 that performs a fixing operation for sucking and mounting components, And a table 2 for positioning the printed circuit board 3 so as to be movable in the XY directions.

  Each component Z of the component supply unit 5 has a degree of freedom only in the direction indicated by the arrow in the figure. Among the component arrangement positions, the Z1 position is the arrangement position having the highest priority. That is, the priority arrangement positions of the parts are sequentially determined from the Z1 side to Z2, Z3,. Then, each part is assigned in order from the Z1 position, and the necessary array positions are used.

  Therefore, in the suction mounting operation of the component Z of the mounting head 4 performed between the fixed positions, the component supply unit 5 first moves, and the component Z of the component supply unit 5 on the mounting head 4 position is sucked by the mounting head 4. Is done. Next, the mounting head 4 mounts the component Z adsorbed on the surface of the printed circuit board 3 set on the table 2 configured to be movable.

  Here, the production order of each kind is sequentially assigned from kind 1 to kind 4 in descending order according to the number of boards to be produced, and kind 2, kind 3, and kind in order from kind 1. Production is done to four.

  The component arrangement of the supply components of the mounting machine configured as described above is determined according to the flow shown in FIG. First, one of the N types 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 components in the list are distributed to each mounting machine on the mounting line (step 3). For example, the sorting operation is divided in order from the smallest component shape to the largest, or from the fastest to the slowest. In step 4, the arrangement of 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. Thereafter, the same is repeated for the next type (N = 2) of printed circuit boards, and finally, the distribution and arrangement of 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. For example, each component supply arrangement Z1, Z2, Z3... Of the mounting machine names MV-1 and MV-2 shown in FIG. Parts (names indicated by ab, aa,..., Etc.) for the printed circuit boards (types 1 to 4) of the seed are assigned.

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

  In the flow shown in FIG. 6, first, in step 1, a list of all parts used on all printed circuit boards (all types) is created. Then, the components in the list are distributed to each mounting machine on the mounting line (step 2). For example, all the parts are sorted in order from the smallest to the largest, or from the fastest to the slowest. Evenly distributed so that it can be removed. In step 3, the distributed component arrangement is assigned to the component supply unit of each mounting machine.

  This arrangement is common to all types of printed circuit boards. The component supply arrays Z1, Z2,... Of the mounting machine names MV-1 and MV-2 shown in FIG. All the part names of (product types 1 to 4) are assigned.

  In the conventional method for determining the arrangement of parts, in the method of FIG. 4, it is necessary to change the arrangement of the component supply units when changing the type of printed circuit board. There is a problem of going down.

  On the other hand, in the method of FIG. 6, it is not necessary to change the arrangement of the component supply units even if the type is switched, but parts that are not used in a specific type are also set. There is a problem that the production efficiency is lowered by the increase in the mounting parts of the printed circuit board due to the movement loss of the component supply unit. Furthermore, when the number of components exceeds the maximum number of component supply units of all mounting machines, there is a problem that the components cannot be mounted on the component supply unit.

  In view of this, in a mounting machine for high-mix low-volume production, there has been a demand for a method for determining the arrangement position of parts that solves the problems of the conventional example and improves the production efficiency.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a method for determining the arrangement of parts for high-mix low-volume production that improves the total production efficiency of a mounting line for mounting parts on printed circuit boards of different types.

  In order to solve the above-described problems of the conventional example, the present invention provides a mounting machine that mounts a component set at a component arrangement position of a component supply unit with a predetermined priority order at a predetermined position on a board. A method of determining a component arrangement of the component supply unit in the case where a predetermined number of substrates are sequentially supplied to the mounting machine, listing all components used in the type of substrate to be supplied, The parts are classified into common parts and non-common parts depending on whether or not the number of types commonly used in advance is set, and the common parts are assigned to the priority arrangement position of the parts supply unit. , The arrangement position is fixedly given so as to be the same position through the mounting work of all types of substrates to be supplied, while the non-common parts are assigned to the non-priority arrangement positions of the parts supply unit, , The sequence position so that the position corresponding to each substrate breeds giving individually, and determines a component arrangement position.

  In the present invention, it is preferable that the priority order of the arrangement position in the common parts is determined by giving priority to parts having a high number of types that are commonly used.

  In the present invention, it is preferable that, in each group of parts classified by the mounting speed, common parts are assigned to priority arrangement positions of the part supply unit rather than non-common parts.

  The present invention can perform the following operations by the above-described configuration. That is, it is classified into common parts and non-common parts according to whether or not the number of commonly used types is greater than the preset number, and the arrangement positions of the common parts are successively and sequentially from the priority arrangement position of the parts supply unit. The arrangement position is determined so as to be integrated, and the arrangement position is fixedly given so as to be the same position through the mounting work of all types of boards, while the non-priority arrangement position of the component supply unit is set for the arrangement position of non-common parts. In addition, the non-common parts are individually given the arrangement positions so as to correspond to the boards of each product type, so even if they are mounted on a multi-product low-volume production machine, they have commonality. The common parts are grouped in the priority arrangement position and can occupy the arrangement position, eliminating the need to switch parts and preventing switching loss as a whole. The total basis can be improved.

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

  Hereinafter, examples showing embodiments of the present invention will be described 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 component Z at the component supply unit 5 having the arrangement positions (Z1, Z2, Z3,. A mounting head 4 that performs a fixing operation of mounting the component Z at the mounting position M and a movable table 2 that positions the printed circuit board 3 so as to be movable in the XY directions are provided.

  Each component Z of the component supply unit 5 has a degree of freedom only in the direction indicated by the arrow in the figure. Among the component arrangement positions, the Z1 position is the arrangement position having the highest priority. That is, the priority arrangement positions of the parts are sequentially determined from the Z1 side to Z2, Z3,. Then, each part is assigned in order from the Z1 position, and the necessary array positions are used.

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

  Next, the mounting head 4 moves the picked-up component Z to the mounting position M and mounts it on the mounting point positioned in the XY direction of the printed circuit board 3 set on the table 2 configured to be movable. .

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

  A method for determining the component arrangement of the mounting machine 1 will be described with reference to the flowchart of FIG. The numbers 1 to 7 shown in FIG. 1 indicate the respective process numbers. In the first process indicated by 1, all parts lists used on all printed boards (all types) are created. This list includes data such as printed circuit board type name, part name, number of parts, and mounting speed.

  In the second step, the commonality of components between printed circuit boards is checked from the component list. Here, the commonality is determined by whether or not the components are frequently used among the printed boards of the four types (product types 1 to 4).

  In the third step, parts are classified based on the commonality. In this classification, parts that have reached a preset level of commonness are classified as two common parts, and other parts are classified as non-common parts. In the present embodiment, parts that are used in common with three or more commonality levels are common parts, and the other parts are non-common parts.

  The fourth process is a process of distributing parts to two mounting machines MV-1 and MV-2 (both having the same characteristics in this embodiment), and a group having a fast mounting speed (mounting time 0.14 sec) , It is roughly divided into slow ones (mounting time 0.25 sec), those with fast mounting speed are preferentially assigned to MV-1, and the mounting time of the two mounting machines is made uniform from the mounting time and the number of parts. It is divided into. As a result, as shown in FIG. 2, only parts with a mounting time of 0.14 sec are allocated to MV-1, and two groups of parts with mounting times of 0.14 sec and 0.25 sec are allocated to MV-2. In general, after the special parts are assigned in consideration of the characteristics of the mounting machine, for example, the parts are sorted in order from small to large, from fastest to slowest. Further, the mounting time of each mounting machine is calculated for each type of printed circuit board, and distribution is performed so that the mounting time is balanced in each mounting machine for any type of printed circuit board.

In the fifth step, the parts distributed for each mounting machine are grouped based on the mounting speed and commonality of the parts. As shown in FIG. 2, in MV-1, common part A ₁ is divided into groups with higher priority, and non-common parts B _{1 and} C ₁ are divided into groups with lower priority. A part with a speed of 0.14 sec and a common part A ₂ as a first priority group, a non-common part C ₂ as a second priority group, a part with a mounting speed of 0.25 sec and a common part A ₃ as a third priority. The non-common parts B _{2 and} C ₃ are grouped in the fourth priority order.

  The sixth step is a step of determining the arrangement of the common components classified from the commonality level. In the step 6a, the component arrangement related to the common components in each group roughly classified in the fifth step is a mounting target. This is determined based on the priority order of the board types (type 1 to type 4).

  Subsequently, in the step 6b, each group whose arrangement within the group is determined in the step 6a is sequentially arranged at the priority arrangement position 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. The parts belonging to the group of these common parts A1, A2 and A3 are fixedly assigned with the part supply unit numbers as shown in FIG. 2, and through the mounting operation to all kinds of boards (type 1 to type 4). There is no part replacement.

Next, the seventh step is a step of determining the arrangement of parts classified as non-common parts with low commonality. The parts belonging to the group of the non-common parts B ₁ , C ₁ , C ₂ , B ₂ , C ₃ are not fixedly given the part supply unit numbers as shown in FIG. The parts are exchanged at the time indicated by * in FIG. In the step 7a, the arrangement positions are preferentially assigned to the parts belonging to the group of parts B _{1 and} B ₂ that are continuously used between substrates of different varieties.

  The types 1 to 4 shown in FIG. 2 are assigned to the types 4 in order from the type 1 in order of the types with the largest number of productions, and the types 1 to 2 and 2 to 3 and 3 to 4 in this order. Therefore, non-common parts having a continuous relationship are preferentially assigned in the range indicated by B1 in FIG. 2 of MV-1, for example. The parts ca of the mounting machine MV-1 having the next highest priority, with the exception of the arrangement position occupied by the common parts through the sixth step, with respect to the parts ca used in the substrates of the types 1 and 2 in which the production order continues. Assigned to supply position Z5. Subsequently, the part dd used on the boards of the product type 2 and the product type 3 in which the production order is continued is assigned to the array position Z6 of the next priority order, the part bf is assigned to the empty part in Z5, and further the part ea Is assigned to Z7.

In the next step 7b, the arrangement of parts belonging to the group of parts C _1, C _{2 and} C ₃ that are non-common parts and have no continuity in the production order is excluded, except for the occupied arrangement positions of the common parts and the continuous parts. They are assigned to the arrangement positions that are blank in the order in which they are attached to the types 1 to 4. Parts cb, ad, and ae shown in the range of B1 and C1 in FIG. 2 indicate the allocation. That is, since the parts cb and ad are parts used in the product type 1, the lowermost blank is the highest priority except for the occupied position of the common components from the product 1 array Z1 position in descending order of the number of mounted parts. Sequentially assigned to the positions Z6 and Z7 to be arranged. Since the part ae is also a part used in the product type 3, it is assigned to the position Z8 which is the most preferential array of the product type 3.

  On the other hand, in the mounting machine MV-2 as well, first, the parts bc and bd of the group having the mounting speed of 0.14 sec are assigned to the arrangement position Z3 which is the priority of the blanks of the type 1 and the type 2 to be used, respectively. Similarly, the group having the mounting speed of 0.25 sec is similarly assigned in the order of arrangement positions Z7, Z6, and Z7 that are blank in the same group of the products in which the parts cf, ce, and da are used.

  The arrangement position of the parts shown in FIG. 2 obtained through the above steps 1 to 7 can greatly reduce the number of parts switching compared with the conventional example shown in FIG. 7 (* in FIG. 2). As shown, the component switching loss can be reduced six times.

The flowchart which shows the Example of this invention. The data figure which shows the components arrangement | sequence. The block diagram which shows a mounting machine. The flowchart which shows a 1st prior art example. The data figure which shows the components arrangement | sequence. The flowchart which shows a 2nd prior art example. The data figure which shows the components arrangement | sequence.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting machine 2 Movable table 3 Printed circuit board 4 Mounting head 5 Component supply part Z Component

Claims (3)

In a mounting machine that mounts components set in a component arrangement position of a component supply unit with a predetermined priority at a predetermined position on a board, a plurality of types of boards are sequentially supplied to the mounting machine in a predetermined number A method of determining a component arrangement of the component supply unit of
List all the parts used on the board of the supplied type,
These parts are classified into common parts and non-common parts depending on whether or not the number of commonly used types is exceeded.
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 position through the mounting work of all types of substrates to be supplied,
On the other hand, the non-common parts are assigned to non-priority arrangement positions of the component supply unit, and the arrangement positions are individually given to these non-common parts so as to correspond to the respective types of substrates,
A method for determining a component arrangement, comprising determining a component arrangement position. 2. The method of determining a component arrangement according to claim 1, wherein the priority order of the arrangement positions in the common components is determined by giving priority to a component having a high number of products used in common. The method for determining a component arrangement according to claim 1, wherein, in each group of components classified by the mounting speed, a common component is assigned to a priority arrangement position of a component supply unit from a non-common component.

Images