CS243737B1 - Method of horizontal adjustment of technological heads of machines - Google Patents

Abstract

The method of horizontal adjustment of technological heads of computer-controlled machines intended for the production of printed circuit boards with respect to reference holes or pins is addressed. The following conditions must be met in this method: The coordinate table of the machine must be positioned with an order of magnitude greater accuracy than the required accuracy of adjustment of the technological heads, and a microscope is mounted on the beam of the technological heads, equipped with a sighting plate with a crosshair and a reading scale, which is horizontally adjustable with an order of magnitude greater accuracy than the required accuracy of the technological heads. The actual method of horizontal adjustment of the technological heads is carried out by gradually reducing the adjustment deviation to below the specified tolerance in successive steps, while the size of the deviation from the nominal position ee is read directly in the microscope, precisely adjusted with respect to the reference pin or hole.

Description

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Method of horizontal adjustment of technological heads of machines

The method of horizontal alignment of technological heads of computer-controlled machines intended for production of printed circuit boards with respect to reference openings, respectively, is solved. pins. In this way, the following conditions must be met: The machine coordinate table must be positioned with an order of magnitude greater than the required precision of the technology heads alignment and a microscope mounted on the technology head beam equipped with a reticle crosshair plate and a reading scale that is horizontal adjustable with orders of magnitude greater than the required accuracy of the technological heads.

The actual method of horizontal adjustment of technological heads is carried out by gradual reduction of the adjustment deviation up to the set tolerance of successive steps. hole.

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The invention relates to the precise horizontal alignment of technological heads (i.e. spindles, laying heads and the like) with respect to a coordinate table. It is therefore mainly used in computer-controlled technological machines for the production of fertile joints. These are eg the coordinate drilling machine for fruit joints, the laying machine for fruit wire joints. ipod.

For precise machine operation, ie. defined execution of motifs on semi-finished products of fertile joint plates, it is necessary that the technological head is in a precisely determined position with respect to the reference point on the coordinate table. The reference point is also the starting point for the control user program of the technological operation. The holes are preferably used for the adjustment. pins intended for placing the board blanks on the coordinate table. Because these. holes, respectively. the pins in the coordinate table are precisely designed to the reference point of the system and can be taken as reference.

At present, two basic methods of horizontal alignment of technology heads are known:

- When the table is precisely set to the specified position, the technological heads move horizontally so that the number of clamps in the spindles resp. the tip of the tool has been inserted into the hole (of the same diameter) in the jig set exactly with respect to the reference point, or directly into the reference hole. After this adjustment, the head is fixed to the head beam

- when the table is precisely set to the specified position, the jig for placing the board blanks on the coordinate table is adjusted with respect to the fixed heads. The jig is adjusted so that the pin is clamped in the spindle, respectively. the tip of the tool fit into the hole (the same diameter) in the jig. Then fix the fixture to the coordinate2 of the table

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As a less accurate variant of the first method, a coordinate drilling method is also used in which the pin tip clamped in the spindle is adjusted against the pin tip inserted into the reference hole. The disadvantage of these methods is the impossibility to detect deviations caused by delimitation of clearances and inaccuracies created during fixation of technological heads, respectively. preparation for semi-finished products.

The above-mentioned drawbacks are eliminated by the method according to the invention, which consists in that the alignment of the technological heads is carried out by gradually reducing the deviation of the horizontal alignment of the technological heads up to a specified tolerance in these successive steps. In the first step the crosshair of the microscope is set to the center of the reference hole, respectively. When the coordinate table is moved to the nominal position through the hole or pin under the microscope.

In the second step, the technological head motif is created on the workpiece clamped on the coordinate table.

In the third step, the deviation of the center or symmetry axis of the motif formed from the center crosshair of the set microscope is subtracted when the coordinate table is moved to a position corresponding to the nominal center position or symmetry axis of the motif created under the microscope.

In the fourth step, the horizontal position of the processing head is adjusted by the offset.

Next, the second, third, and fourth steps are repeated cyclically until the deviation readings are less than a specified tolerance. Finally, the durability of the microscope setting for the second to fourth steps is checked.

The following conditions must be met for this type of adjustment:

- The machine coordinate table must be positioned with an order of magnitude greater than the required accuracy of the technological heads.

- A microscope is mounted on the beam of the technology heads together with the technology heads, equipped with an intentional crosshair plate and a reading scale, which is set horizontally.

- 3 selectable with orders of magnitude greater than the required accuracy of the technology heads.

With the method of the present invention, very precise alignment of the technology heads can be ensured. Since the accuracy of the final product is actually measured, deviations resulting from the fixation of the heads to the beam and the like are also increased in this method of adjustment. These can be corrected. Another important advantage of this method of adjustment is the possibility of checking the accuracy of the final product even during production, in addition to the fact that the accuracy of the final product is measured.

The attached drawing schematically shows an example of the positioning of the aiming microscope on a machine in oblique view. Above the coordinate table 7 are located on the beam 2: a horizontally adjustable technological head 3 and a horizontally adjustable sighting microscope 4. The blank of the plate 5 is defined by a reference hole or a bore. 6, on the coordinate table £. A motif T is formed on the board blank.

Adjusting the technology heads to the reference holes, respectively. according to the invention, for example, can be carried out according to the following procedure:

The table £ moves to the position given by the nominal coordinates of the reference pin or the reference pin. The coincidence of the crosshair and the reference pin, respectively, is adjusted horizontally with the adjusting elements of the microscope 4. hole

6. Preferably, intentional plates with concentric circles are used. According to the program, a designated motif 7 is formed on the blank of the plate according to the program. · Then the coordinate table is shifted by the nominal distance between the axis of the technological head 3 and the axis of the aiming microscope 4. mikroskojSSP 4 directly subtracts deviation from nominal motive position. The magnitude of this deviation appears in the microscope 4 as the distance of the axis of the motif formed 2 ° d of the reticle. Here, it is necessary to adjust the technological head 3. After this

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- 4 adjustments, the head is fixed on the head beam 2. The procedure is repeated until the reading deviates below the specified tolerance ·

The durability of the microscope 4 adjustment is then verified by checking the coincidence of the crosshairs of the microscope 4 with the reference pin and the reference pin respectively. hole 6.

The method and apparatus can be used to align technological heads on wire-laying machines, on printed circuit coordinate drills and other machines operating on a similar principle.

Claims (1)

SUBJECT OF THE INVENTION 243 737 Method of horizontal alignment of technological heads of computer-controlled machines intended for production of printed circuits with respect to reference holes or pellets. The technology heads are mounted on the beam along with a horizontally adjustable microscope with a precision of an order of magnitude higher than the required precision of the technology heads, equipped with an intentional crosshair plate and a reading scale, characterized in that below a specified tolerance in successive steps, wherein in the first step, the microscope crosshair is set at the reference hole and the reference hole, respectively. pin, corresponding to the adjusted technological head, with the coordinate table moved to the nominal position through the hole, respl pin, under the microscope, in the second step the technological head motif is created on the blank clamped on the coordinate table. from the center of the crosshair of the set microscope, when the coordinate table is moved to the position corresponding to the nominal position of the center or the axis of symmetry of the motif created under the microscope, in the fourth step until the reading deviates below the specified tolerance, the durability of the microscope setting for the second to fourth steps is checked by repeating the first step.