SU364396A1 - BORING MACHINE FOR BILATERAL TREATMENT - Google Patents

Description

one

Drilling machines for two-sided machining of flat parts, mainly printed wiring boards, are known that have opposed multi-spindle drilling heads with ejection devices for removing chips and dust during processing.

In order to move. the workpiece in succession towards each of the heads in the proposed machine, the ejection devices of both heads are kinematically connected to each other by means of a cam-lever mechanism, driven by levers of which bring both ejection devices in contact with the workpiece, first feeding it at a regulated amount towards the first head fixed, and then in the direction of the second head, made movable under the influence of the pushers of another cam mechanism.

FIG. 1 shows the kinematic scheme of the proposed machine; in fig. 2 - multi-spindle head, equipped with ejection devices.

The machine consists of two oppositely positioned multi-spindle drilling heads 1 and 2, equipped with individual electric motors 5 and. The top head 1 is fixed to the machine body, and

the lower head 2 is axially movable under the action of cam followers 5 connected to it, the cams 6 of which receive rotation from the electric motor 7 through a two-stage V-belt drive 8, a worm gear 9 and a chain gear 10. The heads / and 2 are equipped with ejection devices 11, mounted on rods 12 and spring-loaded springs 13. To move the workpiece in succession towards each of the heads, ejection devices // are interconnected by a cam-lever mechanism consisting of im from a cam 14 mounted on a shaft 15 of a gearbox 9, cooperating with a roller 16, spring loaded ti 17 and two levers 18 and 19 connected to vertical rods 20 and 21. Ti g 20 and 21 have stretches 22 and 23. Driven levers 24 and

25 cam-lever mechanism associated with ejection devices 11. Each of the heads 1 i 2 (see Fig. 2) consists of a housing 26, a central gear 27, a planetary reduction gear 28, driven gears 29 connected through flexible shafts 30 tools 31, located in the quick-change unit 32. For detachable connection of the quick-change unit 32 and flexible shafts 30, a support plate 33 is used, on which to feed workpieces to the tools

There are stops 34 in various thicknesses limiting the course of the ejector P. To compensate for the difference in thickness of the workpieces, shock absorbers 35 are provided. On the upper head there are two catchers 36 for mounting the workpiece on them.

The machine works in the following way.

The workpiece is installed along two existing openings on the catcher 36 and the electric motors 3, 4 are turned on. 7. When the cams 6 rotate, the head 2 moves upward until the ejection devices 11 touch. The part being processed remains at the same time with two ejection devices. In this position, the thrust gap 21 is completely selected. A further movement of the head upward turns the levers 18 and 19, the drive in the ropings 17 and 20. The spring 37 (see Fig. 1) through the system of the r 17 and 21 and the levers 19 and 25 holds the ejection device 11 the lower head 2 in the extreme upper position allowing it to move along with the head 2 to effect the working feed of the part to the desired depth. When moving the head 2 up on the tools of the upper head 1, the part is unilaterally machined. At the same time, the upper head lever 18 / turns counterclockwise, selects a gap of 20 gaps. At a certain treatment process, for example, foil boards, first of all, one-sided countersinking of the holes is performed by countersinks installed in the upper head /. At the end of the countersinking process, the rollers of the pushers 5 exit to the horizontal platform of the cams 6. The upward movement of the lower head stops. The clearance of the upper head 20 gi is fully selected.

After that, the cam 14 enters into the work, continuing to further lower the rfr 17.

With the start of this movement, the load of the spring 37 is completely removed from the ejection device of the lower head, since the lever 19, turning counterclockwise,

forms the initial gap in the thread 21. With the further movement of the rod 17, the ejection devices of both heads together with the workpiece are moved downward, moving it towards the tools installed in the lower head 2. These tools can be special countersink drills that perform drilling and final reaming holes. Upon completion of the drilling and countersinking operations, the horizontal platforms of the cams 6 end and the head 1 is lowered to its original position. A separate cycle of the machine ends.

Subject invention

Double sided flatbore drilling machine, mainly printed wiring boards, having opposed multi-spindle drilling heads with ejection devices for removing chips and dust, different

so that, in order to move the workpiece in succession towards each of the heads, the ejection devices of both heads are kinematically connected to each other by means of a cam-lever mechanism, the driven arms of which bring both ejection devices in contact with the workpiece, feeding it by a regulated amount first in the direction of the first head fixedly mounted, and then in the direction of the second head made movable under the action of the pushers of another cam mechanism but.

12

(Rig t

35