SU740424A1 - Apparatus for hot tinning of articles - Google Patents

Description

₍ P) 740424

Soviet Union!

Socialist

Republics

State Committee

USSR for Inventions and Discoveries (72)

DESCRIPTION OF THE INVENTION TO COPYRIGHT CERTIFICATE (61) Additional to ed. certificate-wu - (22) 3 announced 02.03.78 (21) 2575323 / 25-27 with the addition of application No. - (23) Priority -

Published on June 15th, 1980. Bulletin No. 22

Date of publication of the description 15.06.80 (51) M. Cl ²

B 23 K 3/00 (53) UDC 621.791.

.3 (088.8)

S. E. Khazine, S. Sh. Rosenmeer, I. B. West and I. N. Metalnikov (71) Applicant (54) DEVICE FOR HOT TINING OF PARTS

The invention relates in particular to soldering devices.

A device for shifting oxides from a mirror of hot dip galvanizing baths ξί] is known, in which a scraper is attached, attached to the carriage and shifted by means of a pneumatic cylinder.

The disadvantage of this device is the lack of a mechanism for loading and moving parts during tinning.

It is also known a device for hot tinning of printed circuit boards containing a bath with molten solder, a mechanism for reciprocating ₅₎ translational movement of the bath, a centrifuge and a fastening mechanism for the workpieces, made in the form of a multi-seat cassette and mounted on the shaft of the centrifuge. 20

This device does not provide high quality tinning due to the formation of oxides on the surface of the solder during operation, and also does not allow the processing of parts with a given service length.

The purpose of the invention is to improve the quality of tinning and expand the functionality of the device.

This goal is achieved by the fact that the device is equipped with a command-program unit, and the bathtub has a pipeline with a valve for supplying inert gas to the bathtub on the solder mirror, a float type scraper and a shutter mechanically connected to the scraper, a shutter movement mechanism electrically connected to the pipeline valve and a group of electrical contacts mounted on the scraper and connected to the command-program unit for controlling the bath movement mechanism, the centrifuge shaft and the shutter movement mechanism.

*

In FIG. 1 shows a block diagram of a device; in FIG. 2 - kinematic diagram of the device.

The proposed device comprises a bath 1 with molten solder and a mechanism · 2 of its movement, made in the form of an electric drive 3 with a reducer 4 and a screw pair 5. Mechanism 2 provides the rise of the bath 1 during operation to maintain a given immersion depth of the machined parts in molten solder. The bath 1 is equipped with a shutter 6, mechanically connected with a 1 ° scraper 7 of a float type, and a group of electrical contacts 8, controlling via the command-program unit 9 the mechanism 2 for moving the bath. The command and program unit 9 is connected to the mechanisms of movement 10 and rotation 11 of the shaft 12 of the centrifuge 13 and the mechanism 14 of the movement of the shutter, providing movement of the shutter 6 with the scraper 7 along the mirror of the syn-70 synchronously with the reciprocating movement of the shaft 12 of the centrifuge 13.

The shutter movement mechanism, electrically connected to the valve 15 of the pipe 16, consists of an electric drive ¥ 17, a gearbox 18 and a rack 19. The centrifuge shaft 13 movement mechanism 10 contains an electric drive 20, a spindle 21 and a nut 22 with a leash 23, moving along the guides 24 together ³⁰ with the shaft of the centrifuge 13. On the shaft 12, located in the carriage 25, a multi-seat quick-release cassette 26 for mounting parts is installed.

The rotation of the shaft 12 is carried out by a drive containing an electric motor 27 and a V-belt drive 28.

The principle of operation of the device is as follows. On the shaft 12 of the centrifuge 13, which is in its highest position, a multi-seat quick-release cassette 26 is installed with machined parts fixed therein, previously coated with a flux.

According to the signals from the command-program unit 9, the mechanism 14 for moving the shutter 6 opens it, while simultaneously moving along the solder mirror a float-type scraper 7 that cleans the solder. 'products of oxidation, and at the same time opens Kyapan 15, through which inert gas flows through line 16 to the side above the solder mirror in order to protect it from oxidation. Then the shaft 12 with the cartridge 26 is lowered by means of the centrifuge shaft movement mechanism 10, immersing the serviced parts in the solder to a predetermined depth and keeping them in it for a set time.

After this time, the shaft of the centrifuge 13 with the cartridge 26 rises and is installed above the solder mirror, while the workpieces do not extend in height beyond the edges of the bath, the mechanism 11 is turned on and centrifugation is performed to remove excess solder from the serviced parts.

After centrifugation, the shaft of the centrifuge 13 with the cartridge 26 rises to its original position, the shutter 6 closes and the cycle of the device ends.

S the process of working and reducing the solder level, the float type scraper 7 closes the electrical contacts and, through the command-program unit 9, turns on the movement mechanism 2, which is switched off after the solder mirror reaches the specified height of its location, which ensures constant immersion depth in the solder of the workpieces.

The proposed device significantly improves the quality of the tinning of parts due to the automatic and stable provision of a given length of service, protection and mechanical cleaning of the solder mirror during each working cycle.

The technological process at all transitions is automated.

The device is universal and can be used to service contact petals reinforced in non-metallic panels and pads, printed circuit boards, and other similar units.

Claims (2)

1. USSR author's certificate No. 120723, cl. C 23 C 1/14 from 02.08.58 - analog. 2. USSR author's certificate number 479575, cl. 23 K 3/06 from 01/03/73 - the prototype. J8 13 P