JPH0758840B2 - Mounting method in electronic component mounter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mounting method in an electronic component mounting machine, and determines a time required for supplying components to an insert head of the mounting machine and a stroke time of the insert head. The present invention proposes a mounting method for setting a suitable insertion order of components so that the mounting operation can be performed without waiting time.

(Prior Art and Problems Thereof) A problem in the electronic component mounting method is the setting of a suitable insertion order of each component on the printed circuit board.

That is, the time required until the tip of the desired tape in the component cassette of the component supply unit is seen in the chucking unit that supplies components to the insert head, the so-called Z-direction moving time, is compared to the insert operation time of the insert head. Since the length is more than several times longer, the insert head will stop waiting for parts during movement in the Z direction if the setting order of parts insertion on the printed circuit board is not correct. If the moving distance of the table that moves in the so-called X-Y direction in the front-back and left-right directions on which the plate is placed is too long, the insert head must stop, and the parts that are chucked after the insert operation can be pushed by the pusher. When pushed, the space for the escape of the guide that guides this part to the insertion position of the printed circuit board, that is, the In the case of an insert head that requires a dead space, it is necessary to minimize the dead time of the parts and the moving time of the table while setting the insertion order of the parts while considering the dead space. In point.

Conventionally, this insertion order setting is tried by trial and error on the printed circuit board diagram by obtaining it, programming it, and inputting it into the mounting machine with a dedicated computer to perform insertion work, so a great deal of labor is required. In need. It should be noted that, when a large number of components are automatically inserted on a printed circuit board, a component insertion order determination method for determining the insertion order in order to insert all the components in a minimum insertion time is disclosed in JP-A-62-274700. It is disclosed as an issue.

In the above component insertion order determination method, a cost matrix having the time required for component insertion as an element is created. As the cost in this case, the component supply time required for component supply and the rotation required for the head to rotate. The time, the movement time required to move the head or the substrate, and the pitch change time required to change the pitch of the head are taken into consideration.

However, the above-described insertion order determination method does not consider the movement time of the component supply unit until the component supply unit faces the insert head, and the taping divided by the component number, such as the mounting machine to which the present invention is directed. The above-described insertion order determining method is insufficient for the structure in which the parts are arranged and the parts are supplied to the insert head by the chucking part.

(Means for Solving Problems) The present invention proposes an efficient mounting method that solves the above-mentioned conventional problems and has no dead time such as waiting for parts of an insert head. , The parts are supplied to the insert head 9 by the chucking part 8 from the part supply part 4 in which the taping parts 7 are arranged according to the part numbers, and the insert is inserted into the printed board 3 on the table 2 which moves in the plane. In an electronic component mounter configured to insert a component by the downward movement of the head 9, the component is based on the output of the drawing means 10 for drawing and storing the component arrangement of the printed circuit board 3 and the output of the component specification storing means 11. A part number is assigned to the part in the placement data by the part number setting means 12, and the part number in the part placement data is assigned to the insert head 9 Based on the dead space required during operation, the dead spaces that are constrained in terms of insert order are divided into groups, and for each part number in each dead space group, another dead space group is created. For a product that causes a problem in dead space during insert, set a temporary order for the insert and set a temporary order including reducing the component supply waiting time that occurs in the same dead space group. Performed by the ranking setting means 16, and when inserting based on this provisional ranking, the intra-group ranking is set by the intra-group ranking setting means 18 so that the constraints on the dead space are satisfied in each dead space group. , In the group in a plurality of sets adjacent to each other in the temporary order in the order of closer to the current position of the insert head 9 and the moving time of the table 2, Stroke of insert head 9, component supply unit 4
The mounting method in the electronic component mounter is characterized in that the execution order setting means 19 is configured to perform the execution order setting in consideration of the movement time of the.

(Operation) The part numbers in the part placement data on the printed circuit board 3 are divided into dead space groups that are restricted by the dead space when the insert head 9 is operated, and each part number in each dead space group is classified. In addition, regarding the ones that cause problems in dead space when inserting in other dead space group, including provisional order of insert and reducing the component supply waiting time that occurs in the same dead space group Since the provisional order setting means 16 sets the provisional order, the mounting time can be shortened sufficiently.

Then, when the provisional ranking set in consideration of reducing the component supply waiting time is executed, the restrictions on the dead spaces appearing in the respective dead spaces are controlled by the group ranking setting means 18. Since it is re-set as an inner rank, the dead space constraint is satisfied in all dead space groups, and it is set in the adjacent groups of modified ranks in the order of proximity to the current position of the insert head. Group ranking and table 2
Since the insert is executed in consideration of the moving time, the stroke of the insert head 9, and the moving time of the component supply unit 4, there is no waiting time for moving the table, and the mounting operation with good work efficiency is performed.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in the schematic plan view of the electronic component mounter 1 in FIG. 3, the printed circuit board 3 is placed on the table 2 that can move in the horizontal plane, and the cassette table 5 of the component supply unit 4 that can move in the left-right direction in the figure. A plurality of tape cassettes 6 are mounted on the top of each of the tape cassettes 6, each tape cassette 6 is internally mounted, and the tip end of the taping component 7 on which a large number of components of the same type are mounted is looked into the table 2. Electronic component mounter 1
The tape cassette 6 to which the cassette table 5 is moved by the action of the control unit of FIG. 2 and which is attached with the component to be inserted into the chucking unit 8 is received, and the chucking unit 8 receives the component on the taping component 7. The chuck of the insert head 9 rotates 90 ° downward, and then moves downward toward the printed board 3 to insert the component into the printed board 3.

The component placement data on the printed circuit board 3 is, for example, CA.
It is drawn and stored by a drawing means 10 consisting of something like D, in which all parts are stored as a series of numbers.

The parts displayed by the series of numbers are parts specification storing means including a computer for managing the material plan.
The part specification data stored in 11 is input to the drawing means 10, and the part number setting means 12 sequentially sets the part number closest to the origin of the insert head 9 to 1 (part numbers having the same specifications have the same part number). Is added) (steps 1 to 3 in FIG. 2). When the insert head 9 escapes after the components have been inserted into the printed circuit board 3, the space required for the escape, that is, the dead space 1 required, is shown in FIG. 4 as a front view.
The component 13 is gripped by a chuck (not shown), the pusher 15 moves downward, the component 13 is inserted into the printed circuit board 3 along the guide 14, and the guide 14 escapes in the direction indicated by the arrow A,
It rises like a two-dot chain line.

Therefore, it is necessary that no parts are mounted in the dead space l, and the position of b is first and then the position of a in the insertion order of the parts a and b.

Each time the insert operation is completed, the table 2 moves forward and backward and left and right to set the next insertion position immediately below the pusher 15. During this time, the insert head 9 moves upward to move the next part from the chucking portion 8. As a result of receiving and performing the insert operation, the table 2 can be moved by about 50 mm during this one stroke of the insert head 9 for about 0.6 seconds.

Therefore, if the insert operation interval on the printed circuit board 3 in one stroke exceeds this 50 mm, there is a waste of waiting for table movement in the insert head 9.

The moving speed of the cassette table 5 in the component supply unit 4 in the Z direction is about 0.5 seconds for each tape cassette 6, so that, for example, the third tape cassette 6 from the current position can be used.
At the time of inserting the part (1), the insert head 9 is stopped to wait for the part for 1.5 seconds-0.6 seconds = 0.9 seconds.

In this way, when designing the insert order, considering three points: (i), dead space (ii), arrangement order of the tape cassette 6 (iii), and mutual component arrangement intervals on the printed circuit board 3, It is important to set the mounting order so that there is no dead time such as waiting for parts.

The temporary order setting means 16 inputs the dead space information necessary for the insert operation from the dead space information storage unit 17, and groups the part numbers in the part arrangement data into dead space groups. As illustrated in FIG. 5, in each of the dead space groups a, b, and c, there is a restriction on the insert order in each group. For example, in the dead space group a, part numbers 5, 3, In No. 2, the insert head 8 whose escape direction is the A direction must be inserted in the order of 5, 3, and 2, so that the insert order surfaces are mutually restricted.

Since the above-mentioned insert order in the dead space group a cannot be normally executed as it is in the other dead space groups c, the order that can be executed in all the dead space groups on the printed circuit board 3 is set to the temporary order setting means.
Set at 16.

As shown in FIG. 6, the temporary order in the component arrangement of FIG. 5 is 4,7,5,3,8,2 in the dead space group b, and the temporary order including the dead space group c is considered. And in group c, the part numbers are later in
Is in the posterior position, and the rightmost one is in the posterior position, so it is inconsistent with the provisional rank in group b above (in groups a and b, is in front of, and is in front of). ) Do.

So, in group c, is the temporary number 9 and the left is the temporary number
10 is set to a temporary number 11, is set to a temporary number 12, and the right end is set to a temporary number 13, so that as shown in FIG.
…, 10,11,12,13, starting from the _first Z ₁ , Z ₂ , Z ₃ , ... Z ₈ ,
Temporary ranks of Z ₉ , Z ₁₀ and Z ₁₁ are set (steps 4,5).

Although illustration is omitted, even if there is no contradiction in the order, for those that are placed in the rear after separating several from the same number,
As in the case of the above contradiction, provisional numbering is configured to be performed by the provisional rank setting means 16, whereby the Z of the cassette table 5 over the above-mentioned several pieces is set.
In this way, the parts supply waiting time is shortened by preventing the movement in the direction.

When the insert is performed by the above-mentioned provisional order setting, the dead space constraint may not be satisfied in each dead space group.

That is, for example, in the case of 9,10,8 in the c group due to the provision of the above-mentioned temporary number, it is necessary to insert 9 first, then 10 and then 8 so that the in-group ranking setting means 18 In order to eliminate the inconsistency of the provisional rank, the rank within the group is set (step 6). Fig. 7 shows the overall ranking when executed based on the group ranking, ... ▲
Is illustrated.

Between the dead space groups, the temporary ranks Z ₁ , Z
_The inserts are executed in the order of ₂ ... However, within the range where the in-group rank is satisfied, between the two adjacent temporary ranks, the insert is executed in the order closer to the current position of the insert head 8. However, the moving distance of the table 2 is short and the efficiency is good.

Therefore, the execution order setting means 19 causes the temporary orders Z ₁ , Z ₂ ...
2 adjacent to each other, for example, Z ₁ and Z ₂ as a pair, and within a radius of, for example, 50 mm from the current position of the insert head 8,
That is, if there are Z ₁ and Z _{2 at a} position that can be moved within 1 stroke of the insert head 9, insert this (for example, insert Z ₂ if there is Z ₂ ) and within 50 mm from this insert position, If there is one, insert it (if not, 50mm + 25mm from the above position,
(Search within 75mm, if not, search within 100mm) In this way, insert Z ₁ and Z ₂ and if Z ₂ ends, then continue the above search with a pair of Z ₁ and Z _3. (Steps 7 and 8).

The tape cassettes 6 having the parts corresponding to the temporary positions Z ₁ , Z ₂ , ... Attached to the taping parts 7 are set on the cassette table 5.

In the example of FIG. 7, Z ₁ and Z ₈ and Z ₃ and Z ₉ are the same parts, but the respective tape cassettes 6 are set separately on the cassette table 5, so that ,
The amount of movement of the cassette table 5 in the Z direction is reduced while satisfying the order on the dead space.

In addition, this invention can use, for example, Panasart (registered trademark) and Avisert (registered trademark) as a commercially available electronic component mounter as they are.

(Effects of the Invention) The mounting method in the electronic component mounting machine according to the present invention is configured as described above, and the component number in the component placement data on the printed circuit board 3 is set as the dead space during the operation of the insert head 9. The dead space groups that are constrained in terms of surface are divided into groups, and for each part number in each dead space group, a dead space problem occurs when inserting in another dead space group. The provisional ranking setting means 16 sets the provisional ranking including setting the ranking and reducing the component supply waiting time that occurs in the same dead space group.
Since this is done by, the mounting time can be shortened sufficiently.

Then, when the provisional ranking set in consideration of reducing the component supply waiting time is executed, the restrictions on the dead spaces appearing in the respective dead spaces are set by the in-group ranking setting means 18. Since it is set again as a rank within the group, this will satisfy the dead space constraint in all dead space groups, and in the order close to the current position of the insert head, within the multiple groups adjacent to each other in the correction rank. Group ranking and table 2
Since the insert is executed in consideration of the moving time, the stroke of the insert head 9, and the moving time of the component supply unit 4, there is no waiting time for moving the table, and the mounting operation with good work efficiency is performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of means for carrying out the present invention, FIG. 2 is a flow chart, FIG. 3 is a schematic plan view of an electronic component mounting machine, and FIG. 4 is a front view of essential parts of an insert head. 5, FIG. 6, FIG. 6 and FIG. 7 are component layout diagrams illustrating the order setting in each step. 1 ... Electronic component mounter, 2 ... table, 3 ... printed circuit board, 4 ... component supply unit, 5 ... cassette table,
6 ... tape cassette, 7 ... taping parts, 8 ...
Chucking part, 9 ... Insert head, 10 ... Drawing means, 11 ... Part specification storage means, 12 ... Part number setting means, 16 ... Temporary order setting means, 18 ... Group order setting means,
19 ... Execution order setting means, a, b, c ... Dead space group, l ... Dead space

Claims (1)

[Claims] 1. A component supply unit, in which taping components divided according to component numbers are arranged, is supplied to an insert head by a chucking unit, and the insert head is attached to a printed circuit board on a table that moves in a plane. In an electronic component mounter configured to insert a component by downward movement, the component of the component placement data is based on the output of the plotting unit that plots and stores the component placement of the printed circuit board and the output of the component specification storing unit. Numbers are assigned by the part number setting means, the part numbers in the part placement data are grouped into dead space groups that are mutually restricted in the insert order based on the dead space required during the insert head insert operation, and For each part number in each dead space group, another Per what occurs a problem on the dead space at the time of the insert in the space group, and sets the provisional order of the insert,
The temporary order setting means sets the temporary order including reducing the part supply waiting time that occurs in the same dead space group, and when the temporary space is inserted based on this temporary order, each dead space is set. Within the group, the within-group ranking satisfying the constraint on the dead space is performed by the within-group ranking setting means, and within the group within the plural groups adjacent to each other of the above-mentioned tentative ranking in the order close to the current position of the insert head. Mounting in an electronic component mounter characterized in that the execution order setting means is configured to set the execution order to be executed in consideration of the order and the moving time of the table, the stroke of the insert head, and the moving time of the component supply unit. Method.