JPH08139490A - Adjustment item management system for product in production process - Google Patents

Abstract

PURPOSE: To accumulate and manage unitarily the results of adjustment in all production processes and to obtain the final adjustment setpoint in each process by a method wherein a correction value in every adjustment object, which is calculated from data on the results of adjustment in every adjustment item in the postprocess, which correlates with adjustment items in the preprocesses of a plurality of the production processes, is fed back to the process terminal means of the preprocesses. CONSTITUTION: Data on the results of automatic adjustment made by respective automatic adjusting devices 12a to 12c in respective production processes 13a to 13c and data 14 on adjustment adjusted by hand operation of operators are respectively transferred to terminal computers 11a to 11c of the respective processes in every one adjustment item. The computers 11a to 11c collect together all the results of the data on the results of adjustment transferred into one file, add machine type names, production lots, serial numbers and information on process ID to the file, make out a process rating whole adjustment result file and transfer the file to a host computer 8 and the computer 8 makes the file into a date base to register the data in a storage device 9. Moreover, the computer 8 makes out feedback data in every adjustment item.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention creates adjustment result data in an automatic adjustment process of a printed circuit board on which components are mounted and an automatic adjustment process of a final product, and based on the adjustment result data, the printed circuit board and the final product are produced. The present invention relates to a measured product adjustment item management system in a product manufacturing process for adjusting a product.

[0002]

2. Description of the Related Art With the improvement and miniaturization of printed circuit board mounting technology, the number of products such as electronic devices using a high-density mounting board is increasing. Each manufacturing process is equipped with an automatic adjustment device in order to make final adjustments to the characteristics of the electronic components and circuits of various printed circuit boards mounted on the product and the product.

Taking an automatic adjustment device for a printed circuit board as an example, generally, the automatic adjustment device 1 is, as shown in FIG. 4, a substrate magazine 2, a magazine loader 3, a substrate transfer section 4, a fixture section 5, an adjustment driver section. 6 and the controller unit 7. Such an automatic adjusting device is installed in each manufacturing process, and the characteristics of each printed circuit board mounted on the product, the characteristics of components mounted on the printed circuit board, etc. are measured and adjusted.

For example, in the case of measuring and adjusting an adjustment component mounted on a printed circuit board, the contact pin of the fixture section 5 having a contact pin for inputting and outputting an electric signal for measurement to the printed circuit board is moved toward the adjustment element. The adjustment element is automatically adjusted by making contact with the input / output terminal of the adjustment element and automatically fitting the bit of the adjustment driver into the adjustment groove of the adjustment element. Then, automatic adjustment is performed so that the characteristics of the adjustment element fall within the adjustment standard. In addition, an operator may manually adjust a portion that is not suitable for automatic adjustment.

Conventionally, there has been a strong tendency that the adjustment work in each manufacturing process is considered as a single process. In other words, the standard center point of the adjustment items in each process is simply adjusted in each process, rather than making an adjustment by explicitly considering how the adjustment result in each process affects the subsequent process (downstream process). I was doing the adjustment work aiming at.

Up to now, there is a system for collecting and analyzing the adjustment results for each process, but the data at each adjustment point is actually analyzed and judged and fed back from the subsequent process to the previous process (upstream process). It is an operator who carries out the process, and it is difficult to provide quick feedback in the present situation where there are hundreds of adjustment points for one model. In this case, even if each adjustment point is finally within the standard,
In some cases, the adjusted value may deviate from the end of the standard, or the product may be out of the standard due to aging.

[0007]

In view of the above-mentioned problems, the present invention centrally collects and manages the adjustment results of all manufacturing steps of the manufacturing steps of the products each equipped with an automatic adjusting device, and finalizes each step. It is a point to provide an adjustment item management system for a measured product in a manufacturing process in which a specific target adjustment value is obtained.

[0008]

A measured product adjustment item management system of the present invention is an automatic adjustment device equipped with each manufacturing process for measuring and adjusting the adjustment items of a measured product flowing through a plurality of manufacturing processes. A process terminal unit that collects adjustment result data in the automatic adjustment device equipped in each manufacturing process and creates a total adjustment result data file for each manufacturing process, and a total adjustment result data file for each manufacturing process created by the process terminal unit In the system for managing adjustment items of a measured product in a product manufacturing process, which comprises a database management unit (host computer) that constructs an adjustment result database based on the adjustment result database, the database management unit is an adjustment item of a previous process in the plurality of manufacturing processes. The correction value for each adjustment item calculated from the adjustment result data for each adjustment item in the subsequent process that is correlated with Fed back to the terminal device, the process terminal unit may instruct the adjustment value obtained by adding the correction value to the adjustment items adjusting means.

The database management means (host computer) obtains a difference between the histogram center value based on the adjustment result for each adjustment item in the subsequent step and the adjustment standard center value for each adjustment item, and the difference is used for the feedback correction. If it is larger than the boundary value that is not required, the movement width of the adjustment item of the previous process necessary to move the adjustment item of the subsequent process by the difference is calculated, and the movement width is used as the correction value for each adjustment item. Feedback to the process terminal means of the previous process.

[0010]

The basic technical idea of the system of the present invention is that the adjustment results of all manufacturing processes of a product are centrally managed in a database of a host computer, the data is analyzed, and the adjustment results of the subsequent process are adjusted in the previous process. The feedback is provided so that the optimum adjustment point can be obtained.

FIG. 1 shows a block diagram of a measured product adjustment item management system of the present invention. In FIG.
Reference numeral 8 denotes a host computer that constitutes a database management means. The host computer 8 is provided with a large-capacity recording device (FIG. 2) for storing the adjustment result, for example, a large-capacity hard disk, and the adjustment result performed by the host computer 8 The data of the result of the collection and analysis are stored and the adjustment result database 9a is constructed.

The host computer 8 has a transmission line 1
Process terminal means on each manufacturing process side, for example, process terminal computers 11a, 11b, 11 which are connected to a network such as a LAN via 0 to communicate with the host computer 8.
c, and automatic adjustment devices 12a, 12b, 12c for communicating with the process terminal computers 11a to 11c. The host computer 8 and the process terminal computers 11a to 11c need only transmit the adjustment results in each process to the host computer 8 and receive feedback data described later, so that mutual data communication can be performed. May be determined as needed.

In consideration of system expandability and high-speed communication, the communication medium is Ethernet (Ethe).
It is preferable to adopt rnet). Further, the communication between the process terminal computers 11a to 11c and the corresponding automatic adjusting devices 12a to 12c employs a communication interface provided in each device, for example, RS-232C, and the automatic adjusting device 12a in the previous process 13a performs the communication. Process 13
Feedback data, which will be described later, based on the adjustment results in steps b and 13c is received, the adjustment point is changed based on the feedback data, and the adjustment result is transmitted to the process terminal computer 11a.

Hereinafter, the flow of the adjustment result data in the system will be described in detail with reference to FIGS. 1 and 2. 1 and 2, the automatic adjustment result data by the automatic adjusting devices 12a to 12c in each manufacturing process 13a to 13c and the adjustment result data 14 manually adjusted by the operator are each process terminal for each adjustment item. It is transferred to the computers 11a to 11c. The process terminal computers 11a to 11c are
All the results of the transferred adjustment result data are collected in one file, and the model name, manufacturing lot, serial number, and process ID information are added to the file to create a process-by-process all-adjustment result file 15. Transfer to the host computer 8.

In the database management routine 8a of the host computer 8, the adjustment data is uniquely specified by the model name, manufacturing lot, serial number, process ID, and adjustment item ID based on the process-by-process total adjustment result file 15, and the database The data is converted and registered in the recording device 9.

Further, the host computer 8 retrieves the data for each adjustment item from the adjustment result database 9a, and based on this retrieval data 16, the adjustment result is statistically analyzed which will be described later, and the feedback data 17 for each adjustment item is obtained. Created by the data analysis routine 8. The feedback data 17 created for each adjustment item is transferred to the process terminal computers 11a to 11c of the corresponding manufacturing process, and the adjustment instructions that take the feedback data 17 into account for each item are used for the subsequent adjustment work. ~ 12c
It is done by operators who perform manual adjustment.

Next, the data analysis and the creation of feedback data in the host computer 8 will be described in detail.
The collected adjustment result data 14 for each adjustment item is statistically analyzed in consideration of information on which item in the next process (post process) the item affects. Feedback data 17 for each adjustment item is created based on this result. In order to create the feedback data 17,
It is necessary to define in advance which adjustment items in the previous process will affect which items in the subsequent process.

FIG. 3A shows the presence or absence of the influence of each adjustment item in step 1, step 2 and final step 3, assuming that there are three manufacturing steps. In FIG. 3A, an arrow indicates that the adjustment result of the adjustment item in step 1 and step 2 affects the adjustable range of the adjustment item in the subsequent steps.

In the case of the example shown in FIG. 3A, the adjustment item 1, the adjustment item 2, and the adjustment item 3 in the process 1 are the process 2
Of the adjustment item 1 of the process 2, the adjustment item 3 of the adjustment item 2 of the process 2, and the adjustment item 4 of the adjustment item 2 of the final process 3 of the process 2. Further, the adjustment item 1 of the process 2 influences the adjustment item 1 of the final process 3, and the adjustment item 2 of the process 2
Affects the adjustment item 1 and the adjustment item 2 in the final step 3.

This example is generally shown as
The influence of adjustment items in each process of a specific product between processes is defined in advance with reference to adjustment data in product design and manufacturing processes. Then, the data analysis routine 8b of the host computer 8 creates the feedback data 17 for each adjustment item based on the dependency relationship list and the adjustment result data 14.

The feedback data 17 is created sequentially from the adjustment item in the subsequent process so that the measurement value at the point where the adjustment and confirmation are finally made becomes the center of the standard. The procedure for creating feedback data will be described below based on the dependency list shown in FIG. Here, the feedback data creation procedure will be described by taking process ID = 2 and adjustment item ID = 2 as an example.

First, when the dependency is extracted, step 2
Adjustment item 2 of step 3 is defined as affecting adjustment item 1 and adjustment item 2 of step 3, so adjustment item 2 of step 2
And the correlation of the adjustment result data of the adjustment items 1 and 2 of the affected process 3 are seen. In the following description, process ID = 2, adjustment item ID = 2 is item A, process ID = 3, adjustment item ID = 1 is item B, process ID = 3, adjustment item ID =
2 will be described as item C.

As shown in FIGS. 3B and 3C, 2
If there is a clear correlation between the two items A and B, the approximate straight line is obtained. When no correlation is found as in (D) of FIG. 3, it is considered that there is no significant dependency between the two items A and B, and the item B is removed from the feedback data creation process of the item A. In the case of this example, the approximation function V _B = f between the measured values V _A , V _B and V _C of the items A, B and C.
It is assumed that there is a dependency represented by (V _A ) and V _C = g (V _A ).

Next, the feedback data is calculated. For this purpose, as shown in (E) of FIG. 3 and (F) of FIG. 3, a histogram of the data of the items B and C is created, and the center point x of the histogram is the standard center value of each item ( The host computer 8 calculates the degree of deviation from the spec center sc). Here, if the difference (sc−x) between the standard center value sc and the histogram center points x of items B and C is W _B and W _C , respectively, these differences W _B and W _C change the adjustment points of item A. This is the width of the adjustment points of items B and C that are desired to be moved.

Either one of the differences W _B and W _C ,
Boundary value W that does not require further feedback correction
If it is _L or less, the item B by the adjustment point correction of the item A
The adjustment of the values of C and C is considered to have reached the limit, and feedback adjustment is not performed. The value of the boundary value W _L is determined by the user of the system.

If both W _B and W _C are larger than W _L , feedback data is created. First, assuming that the moving widths of the item A required to move the values of the items B and C by W _B and W _C are S _B and S _C , these moving widths S _B and S _C are between the items. Approximate expression V _B = f (V
_A ) and V _C = g (V _A ) can be calculated.

The calculated moving widths S _B and S _C are evaluated according to the following criteria to create feedback data. (1) When the movement widths S _B and S _C have different signs, the feedback data is not created. This is because, in this case, whichever one is adopted, the other one deviates from the standard value.
In this case, it is considered that the standard settings are incorrect.

(2) When the moving widths S _B and S _C have the same sign,
The one with the smaller absolute value is adopted as the feedback data. The reason why the smaller one is adopted is that if the one with a larger absolute value is adopted, the other may be overcorrected.

(3) When compared with the correction limit value of item A, if S _B is a candidate for feedback data,
S _B is compared with the correction limit value of item A, and the smaller absolute value is used as feedback data. The correction limit value of this item A is the maximum width from the standard center value to which feedback correction can be applied, and is defined by the system user.

The feedback data of each adjustment item calculated through the above procedure is transferred to the corresponding process terminal computers 11a to 11c. Then, the process terminal computer that receives the feedback data sets the point, which is moved by the feedback data from the current adjustment target point, as the adjustment target point, and automatically adjusts devices 12a-1a.
2c or give an adjustment instruction to the operator.

As described above, the system of the present invention centrally collects and manages the adjustment results of all product manufacturing processes, and automatically obtains the final target adjustment value by using a statistical method. In addition, it is a system that feeds back the data of the post-process to the adjustment of the pre-process to perform manufacturing.

[0032]

By adopting the system as described above, the feedback can be applied to the previous process so as to approach the final standard value as much as possible, so that the variation of the final adjustment value of the product can be reduced. be able to. In addition, even if adjustment fluctuations of the product due to changes over time occur, it is unlikely that the standard is not met. Further, since the system can automatically analyze and feed back the adjustment result, it is possible to perform the subsequent setting without the labor of the operator after the initial setting.

[Brief description of drawings]

FIG. 1 is a block diagram of a system of the present invention.

FIG. 2 is a diagram showing a data flow for making feedback instructions by creating feedback data for each adjustment item in the system of the present invention.

FIG. 3 is a diagram for explaining an adjustment item dependency relationship between a pre-process and a post process, a diagram for explaining a correlation between adjustment items in the pre-process and the post-process, and a histogram of post-process adjustment results.

FIG. 4 is an explanatory diagram of a general automatic adjustment device.

[Explanation of symbols]

 8 host computer 9a adjustment result database 11a, 11b, 11c process terminal computer 12a, 12b, 12c automatic adjusting device 13a, 13b, 13c manufacturing process

Claims (5)

[Claims] 1. An adjustment item adjusting unit equipped in each manufacturing process for measuring and adjusting an adjustment item of a measured product flowing through a plurality of manufacturing processes, and adjustment result data in the adjustment item adjusting unit equipped in each manufacturing process. And a database management unit for constructing an adjustment result database based on all manufacturing process-specific adjustment result data files created by the process terminal unit. In the measured product adjustment item management system in the product manufacturing process, the database management means adjusts the adjustment items calculated from the adjustment result data for each of the adjustment items of the subsequent process correlated with the adjustment items of the preceding process in the plurality of manufacturing processes. The correction value for each is fed back to the process terminal means of the previous step, and the process terminal means adjusts the correction value in consideration. A measured product adjustment item management system in a product manufacturing process, characterized by instructing the adjustment item adjustment means. 2. The database management means obtains a difference between a histogram center value based on an adjustment result for each adjustment item in the subsequent step and an adjustment standard center value for each adjustment item, and the difference requires the feedback correction. If it is larger than the boundary value, the movement width of the adjustment item of the previous step necessary to move the adjustment item of the subsequent step by the difference is calculated, and the movement width is used as the correction value for each adjustment item in the previous step. The measured item adjustment system for a measured product in a product manufacturing process according to claim 1, wherein the system is fed back to the process terminal means. 3. The measured product adjustment item management system in a product manufacturing process according to claim 1, further comprising adjustment result database recording means for recording the adjustment result database. 4. The measured product adjustment item management system in a product manufacturing process according to claim 1, wherein the adjustment item adjustment means is an automatic adjustment device including a fixture section and an adjustment driver section. 5. The measured product adjustment item management system in a product manufacturing process according to claim 1, wherein the measured product is a printed circuit board on which an adjusting element is mounted.