JPS6215028A - Parts arrangement determination method in automatic assembly machine - Google Patents

Abstract

PURPOSE:To shorten the moving time of a component selecting/feeding unit by classifying components into groups based on the connection degree between the similar components, while said connection degree being determined according to their insertion order and putting each process for determining the arrangement of groups and the components in a group into practice in the assigned order based on the distance between groups. CONSTITUTION:The connection degree between components is determined based on component insertion order, and the quantity X of specific components incorporable in a group is set based on the determined connection degree. Then, the combination of components having the highest connection degree with each other is found out and put in a group to distinguish components having high connection degree with each other. In the next step, the connection degree between groups is taken as the sum of the connection degrees between components in a group, and the moving distance of a component selecting/feeding unit 4 is determined, based on the already determined connection degree between groups, for the arranging method of all groups so that the minimum arrangement can be selected. In the next step, components are classified into groups RGr and LGr positioned adjacently to an arrangement group G+1 in clockwise and counterclockwise directions respectively and the protimity of a component to the group RGr is expressed by the difference between respective connection degrees RK and LK and components included in respective groups are arranged from the side of RGr in the order of the value thus determined for all the components from large one, and further the same process being carried out for all groups.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a production system that automatically produces parts by selecting them according to NC data from among the parts set in the parts selection and supply section of an automatic parts assembly machine. The present invention relates to a component placement determining method suitable for shortening the moving time of the component selection and supply unit.

[Background of the invention]

Regarding conventional technology of this kind, Japanese Patent Application Laid-open No. 52
There is one described in Japanese Patent No.-38629. This proposal makes it possible to effectively and reliably reduce the indexing time of the tool magazine by controlling the rotational direction of the tool magazine.

However, when setting the tools in the tool magazine, there is a problem in that no consideration is given to how the tools are arranged.

[Purpose of the invention]

In view of the above, an object of the present invention is to provide a component placement determining method that can shorten the travel time of a component selection and supply section in an automatic assembly machine.

[Summary of the invention]

In order to achieve the above object, the present invention includes a step of determining the frequency between the same parts from the insertion order of the parts, determining the relationship speed between the parts using the frequency as an evaluation function, and using the relationship speed to determine the frequency between the same parts. a step of dividing the parts into groups so that the number of parts becomes a predetermined value; a step of determining the arrangement of the groups by determining the distance between the groups from the parts in the group; and a step of determining the arrangement of each part in the group. The method is characterized in that the arrangement of components in the component selection and supply section is determined by sequentially performing the steps described above.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of applying the method of the present invention.

That is, it is a schematic diagram showing the configuration of a component placement device in an automatic component assembly machine. In the figure, 1 is a terminal for inputting necessary data, and 2 is a computer having a built-in arithmetic section 2A and a storage section 2B, and this computer performs arithmetic processing for executing the method of the present invention. Reference numeral 3 denotes a floppy disk that serves to receive and deliver component placement information as a result of the arithmetic processing to a site management center (not shown).

FIG. 2 shows an example of a component selection and supply section, and the component selection and supply section 4 is comprised of a component magazine 5 and a component insertion section 6. The parts magazine 5 can set 35 parts and is provided so as to be rotatable forward and backward. By rotating the component magazine 5 forward and backward in accordance with command data, the component to be inserted next among the components set in the component magazine 5 is positioned in the component insertion section 6.

The component placement device configured as described above performs the following steps: (1) relationship speed between components, grouping of (111 parts), placement determination of (lI+1 group), and placement determination of components within (lvl group). A method is implemented in which four steps are performed sequentially.The four steps are detailed below.

(1) First step: Opening speed between parts The opening speed between parts is determined from the insertion order of the parts. Now, when B1 *B2 +BS...... are parts and the insertion order of parts is E, - + horse → B3 → B2 → B1 → Bt, let us calculate the number of occurrences of the insertion order Bi → B. 2 times Ej→B
, the number of occurrences of the insertion order is 1, then the relationship speed between Ei and Bj is n I J +n y a.

In this way, the relative speeds between all parts are determined.

(11) Second step: Parts are divided into groups using the relative velocity between the parts determined in the first step. First, a predetermined number of parts X that can be assembled into one group is set. Here, it is assumed that the X is set so as to reduce the calculation processing time.

Among the inter-component inter-component velocities determined in the first step, a combination of parts having the highest inter-component velocity, that is, a large value representing the inter-component velocity, is found and combined into a group. Determine whether the number of parts in the group has reached X, and when it has reached
Finishes allocating parts to one group, and performs processing to allocate unallocated parts to the next group. If the number is less than X, the correlation speed between the group and the undistributed parts is determined, and the component with the highest correlation speed is selected and incorporated into the group. In this way, the parts are divided into groups such that parts with high speeds belong to one group.

+1111 Fifth step...Group placement determination In order to decide the group placement, first find the relative velocity between the groups. Here, since the arrangement of the parts within the group has not yet been determined, it is assumed that all the parts within the group are located at the center of gravity of the group. In this case, the relative speed between groups is defined as the sum of the relative speeds between parts included in each group.

Next, decide on group placement. Regarding all the ways of arranging groups, based on the degree of association between groups that has already been determined,
Find the moving distance of the parts selection supply section. Group Gy (
The distance P (1°J) between 11 and Gr (Jl) is obtained from the following formula +11.

P(1, J) = (Gr(11 and 0r (degree of association with Jl) X Ltt -=-tl) However, LIJ is Gr(
11 and Gr(Jl).

The above LII represents the degree of distance from Gr(11), such that the distance coefficient to the group located next to Gr(1) is 1, and the distance to the next group is 2. Here, since the component selection and supply unit is capable of forward and reverse cylinder rotation, the smaller value is set.

Find the distance traveled for all group placement methods,
Among the moving distances, the minimum arrangement is selected.

(lvl 4th step...Determining the placement of parts within the group When deciding the placement of the parts within group Gr(1),
In the arranged groups, Gr (11, the group RGr is closer to the clockwise direction, and the group LGτ is closer to the counterclockwise direction)
It is divided into two groups. Next is G? (Parts included in II, such as ffLl and the above group RGr)
The degree of association RE with B(il and the group LG
The degree of association LK with r is calculated, and the difference in the degree of association (Rf - LK
) is set to 7, which represents the proximity of B(il to the group RG). Find this value for all the parts included in Gr (1), and arrange them from the RGr side than the parts with the larger value. .Such processing is performed for all groups to determine the placement of all parts.

The parts may be arranged in the parts selection and supply section based on the arrangement order of the parts obtained as a result of performing the processes from the first step to the fourth step described above.

In this embodiment, the component placement determination was explained when the component selection and supply section of the automatic component insertion machine was of the rotary type.
It can also be applied to determining tool placement in the tool magazine of a C machine tool.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, when parts whose insertion order is determined in advance are inserted into an automatic assembly machine, the moving time of the parts selection and supply section of the assembly machine is shortened.
Since parts can be arranged, the efficiency of assembly work can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a device to which the method for determining the placement of parts in an automatic assembly machine of the present invention is applied, and FIG. 2 is a schematic diagram of a component selection and supply section of the automatic assembly machine. 4... Parts selection supply section 5... Parts magazine 6.
・Parts insertion part stem 1 time 32 times

Claims (1)

[Claims] In a production system that selects and automatically produces parts according to NC data from parts that have been set in the parts selection and supply unit of an automatic parts assembly machine, the frequency between identical parts is determined from the insertion order of parts, and the A process of determining the degree of association between parts using frequency as an evaluation function, a process of dividing the parts into groups using the degree of association so that the number of parts in the group becomes a predetermined value, and a process of dividing the parts from the parts in the group between the groups. and determining the placement of each component within the group, and by sequentially performing the steps, the component selection and supply section determines the placement of the components. A method for determining component placement in an automatic assembly machine, characterized by: