JP2008015938A - Production management method and production management system of manufacturing line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the quality of a product by reflecting an inspection result in an inspection process on a manufacturing process. <P>SOLUTION: An inspection apparatus 12 measures the dimensions of various parts constituting a bearing 24. When the measurement values by inspection by the inspection apparatus 12 shows a trend that the measurement values gradually come close to a standard upper limit value 106 even though the measurement values do not exceed the standard upper limit value 106, an assembling method of an assembling device 10 in the manufacturing process is changed or the driving of the assembling device 10 is stopped when a management apparatus 14 manages the measurement values. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a production management method and a production management system for a production line suitable for accurately managing the state of each process in a production line for producing products such as bearings using various components.

  As a rolling bearing used in automobiles and various industrial machines, for example, a sealed bearing that seals a bearing space filled with grease is known. In a production line for manufacturing this type of rolling bearing, in order to evaluate the sealing performance required for the seal bearing, the rolling bearing is rotated for a predetermined time in a state where it is in contact with a liquid mixed with minute foreign matters, and then the race ring is One of these is fixed, the other is rotated at a predetermined rotational speed, the vibration displacement of the fixed bearing ring is measured, and the sealing performance of the rolling bearing is evaluated based on the measured vibration displacement ( Patent Document 1).

In addition, when judging the quality of a product on the production line, the product that has undergone the manufacturing process is subjected to various inspections in the inspection process, such as matching inspection, vibration inspection, and appearance inspection. For example, in the vibration inspection, standard values are set. In addition, a threshold value is set for the standard value, and when the measured value is within the threshold value range, it is judged as a non-defective product (normal). A method of judging is adopted.
Japanese Patent Laid-Open No. 2005-207764

  However, in the inspection process, in the method of judging pass / fail by comparing the measured value and the threshold value, even if the measured value is out of the standard value, it is judged as good if it is within the threshold value range, In the manufacturing process, even if many products that are within the threshold value range and deviate from the standard value are manufactured, the inspection result is not reflected in the manufacturing process, which is not sufficient for improving the quality of the product.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to improve the quality of a product by reflecting the inspection result in the inspection process in the manufacturing process.

  In order to achieve the object, the present invention includes a manufacturing process in which a plurality of parts are assembled to form a product, and an inspection process in which the inspection object is inspected with each of the parts or the product as an inspection object. In the process, the static characteristic of the inspection object is measured according to a preset rule, and the measurement value is compared with the quality determination value to determine the quality of the inspection object, and the measurement values are sequentially accumulated and the The production management method of the production line is adopted in which the content is judged and the judgment result is reflected in the production process.

  According to the above-described means, it is possible to further improve the quality of the product by sequentially accumulating the measurement values and determining the contents thereof and reflecting the determination results in the manufacturing process.

  According to the present invention, product quality can be further improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a production management system for a production line showing an embodiment of the present invention. In FIG. 1, in a production line for manufacturing a bearing, processes such as a manufacturing process for assembling various parts to form a product, and an inspection process for inspecting an inspection object with each part or product as an inspection object are set. Yes. An assembly apparatus 10 for assembling various bearing parts is arranged in the manufacturing process, and an inspection apparatus 12 for inspecting the inspection object is arranged in the inspection process with various bearing parts or bearings as inspection objects. The inspection device 12 is connected to a management device 14, and the management device 14 is connected to a communication network 16 such as the Internet.

  Here, as shown in FIG. 2, when the bearing 24 is assembled using the outer ring 18, the inner ring 20, and the ball 22 as bearing parts, these bearing parts are loaded into the assembly apparatus 10 in the manufacturing process. In this embodiment, the outer ring 18, the inner ring 20 and the ball 22 are used as inspection targets, and the static characteristics of the inspection target are measured.

  Specifically, as the dimensions of the individual parts, the groove diameter φa of the inner diameter groove 18 a of the outer ring 18, the groove diameter φb of the outer diameter groove 20 a of the inner ring 20, and the outer diameter (diameter) φc of the ball 16 are measured by the inspection device 12. Then, the measurement value of each part is managed by the management device 14.

  For example, when the ball 22 and the inner ring 20 are fixed, the gap between the elements including the inner ring 20 and the ball 22 and the outer ring 18 = φa−φb−φc × 2 is obtained, and the outer ring having the optimum gap among the many outer rings 18 is obtained. 18 is selected, and only the selected outer ring 18 whose gap is within the range of the standard value is stocked in the stocker 24 in the assembling apparatus 10 as shown in FIG. When the dimension φa of the stocked outer ring 18 is managed by the assembling apparatus 10 and the bearing 24 is assembled using the outer ring 18, the inner ring 20 and the ball 22 in the manufacturing process, the stocker 24 is attached to the inner ring 20 and the ball 22. The stocked outer ring 18 is assembled to form the bearing 24.

  When the groove diameter φa of the outer ring 18 is sequentially measured by the inspection device 12 and each measured value is managed by the management device 14, as shown in FIG. When obtained, for example, JIS rules can be adopted as shown below. In this case, with respect to the reference value 100, a management upper limit value 102 and a management lower limit value 104 are set as standard values, and a standard value upper limit 106 and a standard value lower limit 108 are set as threshold values.

Rule 1 One point exceeds area A.
Rule 2 Nine points are on the same side with respect to the center line (reference value 100).
Rule 3 6 points increase or decrease.
Rule 4 14 points increase or decrease alternately.
Rule 5 Out of 3 consecutive points, 2 points are in region A or beyond.
Rule 6 Four out of five consecutive points are in region B or beyond.
Rule 7 There are 15 consecutive points in region C.
Rule 8 There are 8 consecutive points in the region beyond region C.

  Further, the management device 14 compares the measured value and the pass / fail judgment value for each outer ring 18 to determine the pass / fail of each outer ring 18, and sequentially accumulates each measured value in the storage device to determine its contents. This determination result can be reflected in the assembly method in the manufacturing process. In this case, each measurement value is sequentially stored in the memory and its contents are determined. As a rule for reflecting this determination result in the assembly method in the manufacturing process, for example, the measurement value is an upper limit of a standard value as a pass / fail determination value. When a tendency toward 106 or the standard value lower limit 108 is shown, a rule that reflects the change tendency of the measurement value in the assembly method in the manufacturing process can be adopted.

When this rule is applied to the measurement result shown in FIG.
Since the sample 8 exceeds the standard value upper limit 106, it is determined as a defective product (NG).
Although the samples 13 and 14 do not exceed the standard value upper limit 106, but exceed the control value upper limit 102, the target value in the manufacturing process, which is the previous process, is automatically changed.

  In addition, regarding samples 5, 6, 7 and samples 10, 11, 12, and 13, the standard upper limit 106 is not exceeded, but since it tends to gradually approach the standard upper limit 106, information indicating this change tendency is used. By changing the assembly method in the manufacturing process, the measured value of the next sample can be prevented from exceeding the standard value upper limit 106, and the quality of the bearing 24 can be further improved.

  A rule for sequentially storing each measured value in a memory and determining the contents thereof and reflecting the determination result in an assembling method in the manufacturing process can be applied to a measured value related to the static characteristics of the bearing 24 as a product. . That is, the dimension of each part of the bearing 24 assembled through the manufacturing process can be measured by the inspection device 12 and each measured value can be managed by the management device 14. In this case, although the measured value does not exceed the standard upper limit 106, the quality of the bearing 24 is further improved by changing the assembly method in the manufacturing process based on information indicating a tendency to gradually approach the standard upper limit 106. Can do.

  In addition, even if the measurement result (inspection result) in the inspection process is reflected in the manufacturing process, if defective products occur frequently, the assembly apparatus 10 in the manufacturing process is automatically stopped, or defective products occur frequently. Can be configured to automatically notify the administrator from the management device 14.

  In addition, the measurement result of each sample shown in FIG. 4, the determination result regarding each sample, the occurrence status of defective products, and the like are expressed on the network via the communication network 16, and an event log is displayed. Anyone can check the measurement result of the sample, the determination result related to each sample, the occurrence status of defective products, etc. with a terminal device or the like.

It is a block diagram of the production management system of the manufacturing line which shows one Example of this invention. It is a figure for demonstrating the dimension of the components for bearings. It is a principal part process drawing for demonstrating the assembly method of the components for bearings. It is a figure for demonstrating the change of the measured value of the components for bearings.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Assembly apparatus 12 Inspection apparatus 14 Management apparatus 16 Communication network 18 Outer ring 20 Inner ring 22 Ball 24 Bearing

Claims (5)

  A manufacturing process for assembling a plurality of parts to form a product; and an inspection process for inspecting the inspection object with each of the parts or the product as an inspection object. In the inspection process, the inspection object is in accordance with a preset rule. And measuring the static characteristics of the test object, comparing the measured value with a pass / fail judgment value to determine pass / fail of the inspection object, and further accumulating the measured value in order to determine its contents, A production management method for a production line including a management process to be reflected in the production process.   The management process sequentially accumulates the measurement values, and when the measurement values show a tendency to approach the pass / fail judgment value, the change tendency of the measurement values is reflected in the manufacturing process. A production management method for the described production line.   3. The production management method for a production line according to claim 1, wherein information related to the measured value is transmitted to a communication network in association with the pass / fail judgment value.   When the bearing includes an outer ring, an inner ring, and a ball as the product, the inspection step measures a gap between the inner ring, the element including the ball, and the outer ring based on the outer ring. The production management method for a production line according to any one of claims 1, 2, and 3.   An assembling apparatus that assembles a plurality of parts to form a product, an inspection apparatus that inspects the static characteristics of the inspection object using each of the parts or the product as an inspection object, and a management apparatus that manages measurement values obtained by inspection of the inspection apparatus The management device compares the measured value by the inspection of the inspection device and the pass / fail judgment value to determine pass / fail of the inspection object, and sequentially accumulates the measured value to determine the contents thereof, A production line production management system in which the determination result is reflected in the assembly apparatus.

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