JPH0478040B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a printed board assembly production method for assembling printed boards by automatically mounting electronic components, and more specifically to a printed board assembly that reduces the number of parts setups. Regarding production methods.

[Background of the invention]

Conventionally, in a printed board assembly production system using a component mounting machine, a method is used in which component setup is performed for each type of printed board. In other words, for each type of printed board, a cartridge of electronic components (one type of parts taped in a reel shape) to be mounted on the printed board to be assembled is sent to the component selection and supply section of the component mounter for only the type of component to be used. must be set.

However, when assembling printed boards of a wide variety of products and in small quantities, there is a drawback that production efficiency is reduced because parts setup (cartridge replacement) is complicated. There is also a fixed loading method, in which frequently used electronic components are fixedly set in advance, and other components are set in variable parts when setting up the parts. It's not a fundamental solution.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a printed board assembly production method that eliminates the drawbacks of the prior art described above, reduces the number of parts setups, and increases production efficiency.

[Summary of the invention]

In the printed board assembly production method of the present invention, as long as the number of types of parts used does not exceed the number of cartridges that can be loaded in the parts selection and supply unit, a plurality of printed boards that have a high degree of commonality in used parts are assembled into one assembly group. Create an assembly group, place cartridges of electronic components to be used in one assembly group in the parts selection supply section in one parts setup, and continuously print all types of printed boards included in the assembly group. It is characterized by assembling and repeating this process for multiple groups.

〔Effect of the invention〕

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a flowchart showing an overview of the printed board assembly production method of the present invention. As shown in the figure, in step S1, production planning information regarding the production model, type of parts used, number of printed boards, etc. of printed boards to be produced for one day is obtained from the production planning system (which is outside the scope of the present invention). In step S2, each assembly group consisting of printed boards having a high degree of commonality in used parts is created by a method to be described later. Next, in step S3, for each assembly group, it is determined at which numbered location (this is called an address) in the component selection and supply unit, cartridges of all component types used in that assembly group are to be placed. That is, component placement means associating component names with addresses of the component selection and supply section. Since a component mounter supplies components from a specified address, address information is required for the execution NC data that actually operates the component mounter. The combination of parts and addresses is arbitrary. The determined component placement data is used as setup information before assembly of the group.

On the other hand, the NC data used by the component mounting machine is first created in step S4 based on the drawing, including the component name,
Intermediate information consisting of the X and Y coordinates of the mounting position, mounting direction, etc.
Created as NC data. At this stage, the component extraction position is undefined. Next, in step S5, using the component placement data (correspondence between the component name and the address of the component selection and supply section) determined for each assembly group, the component pick-up position that was undefined in the intermediate NC data is set. Create execution NC data by setting the address of the component selection supply unit for the corresponding component name. In this way, the middle
The reason for keeping it in the form of NC data is that the content of the assembly group differs depending on the day's production target, and therefore the parts arrangement also changes from day to day.

Next, a method for creating an assembly group will be explained. Figure 2 a shows printed boards P ₁ , P ₂ ,
It is a figure which shows the relationship between _P3 and its used part types (a-i). When creating an assembly group, in order to minimize the number of component setups, it is necessary to ensure that the number of component types used in the assembly group does not exceed the number of cartridges that can be loaded in the component selection and supply section. . Therefore, each printed board P ₁ ,
The concept of Hamming distance is used to group P ₂ and P ₃ based on the commonality of the types of parts used.
The Hamming distance is an index showing how much difference two things have, and the Hamming distance Hij between the printed boards Pi and Pj is given by the following equation.

Hij=-P→i∪P→j-P→i∩P→j- Here, Pi is a set of types of parts used in the printed board Pi, and P ₁ = {a, b, c, d, e} , P ₂ =
{a, b, c, f, g, h, i}. Pi∪Pj,
Pi∩Pj represents a merged set, a common set, and P ₁ ∪P ₂
= {a, b, c, d, e, f, g, h, i}, P ₁
∩P ₂ ={a, b, c}. Again - Pi - is a gathering
It represents the number of elements of Pi, for example, |P|=5. That is, the Hamming distance Hij is the printed board Pi,
It is the number of parts types that are used only on one side of Pj,
The larger this value is, the more different the types of parts used in the two printed boards Pi and Pj are in terms of component setup.

FIG. 2b shows the Hamming distance between printed boards P ₁ , P ₂ , P ₃ .

FIG. 3 is a flowchart showing the processing procedure for creating an assembly group. First, step S
10, the maximum number of parts that can be attached KMAX (the number of cartridges that can be loaded in the parts selection and supply section) is set, and the group number G=0 is set. Step S
11, execute G=G+1 and update the group number. Next, in step S12,
Take out one of the printed boards with the maximum Hamming distance from the undistributed printed boards (printed boards that have not yet been grouped). In step 13, the printed board is allocated to the assembly group with group number G, and the types and number of parts used in the group are updated. Next, step S
In step 14, the Hamming distances between the types of parts used in Group G and the unallocated printed boards are calculated and arranged in descending order of Hamming distance. Step 15
When the printed board with the smallest Hamming distance is taken out and the printed board is allocated to the assembly group with group number G in step S16, the number of types of parts used becomes the maximum number of parts that can be installed.
Determine whether or not it exceeds KMAX, and if it does not, return to step 13, distribute the printed board to the assembly group with group number G, and execute the same process again, so that the number of types of parts used is the maximum number that can be mounted. If KMAX is exceeded, it is determined in step S17 whether or not the possibility of distribution has been investigated for all printed boards. If there remains a printed board for which the possibility of distribution has not been investigated, the process returns to step S15 and the same process is performed again. and examine the distribution possibilities for all printed boards. In step 18, it is determined whether all printed boards have been distributed,
If there are unallocated printed boards, the process returns to step 11 and the same process is executed again to create a new assembly group, and when all printed boards have been distributed, the assembly group creation process ends.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, each assembly group is created using printed boards that use parts with a high degree of commonality, and all types included in one assembly group are created in one part setup. Assembling of printed boards can be performed continuously. Therefore, it is possible to reduce the number of times the parts are set up, and the time required for assembling without any setup is extended, so that the production efficiency of printed boards can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an overview of the present invention;
FIG. 2 is a diagram showing an example of the relationship between a printed board and the types of parts used, and FIG. 3 is a flowchart showing a processing procedure for creating an assembly group according to the present invention. S1-S5, S11-S18...Steps of flowchart, _P1 , _P2 , _P3 ...Printed board, a
~i... Type of parts used.

Claims (1)

[Scope of Claims] 1. In a printed board assembly production method in which electronic components are mounted on a printed board using an automatic mounting machine, at least the production model, the type of parts used, and the number of pieces produced regarding various printed boards to be assembled. Based on the production planning information, different models with a high degree of commonality in the parts used can be produced continuously without changing parts setup, within the range of the number of parts types that can be loaded at once on the parts selection and supply section of the automatic mounting machine. Create each assembly group consisting of printed boards, and place all the parts used for each created assembly group at which number location (expressed by address) in the component selection supply section of the automatic mounting machine. whether to set
Determine the component placement data expressed by the correspondence between the component name and the address of the component selection and supply unit, which is created in advance and consists of at least the component name, the X and Y coordinates of the mounting position, the mounting direction, and the component removal position. (Address of the parts selection supply unit) is at the above part extraction position of the intermediate NC data that is undefined.
A printed board assembly production method that reduces the number of parts setups, characterized by creating execution NC data in which the address of a parts selection and supply section is set based on the parts arrangement data determined for each assembly group. 2 In creating the above assembly group, the type of parts to be mounted on any one type of printed board among the various printed boards to be assembled, and the other one.
The number of component setups recited in claim 1 is reduced, characterized in that assembly groups are created by evaluating the degree of commonality with the type of component to be mounted on a different printed board using Hamming distance as an evaluation measure. Printed board assembly production method.