SU729276A1 - Coating device - Google Patents

Description

one

The invention relates to the field of hot coating, in particular to devices for applying coatings to parts by dipping the coating material into the melt.

A coating device is known comprising a spindle head with a stop mounted on a column and provided with a basket-type container, a pool and a fluxing bath, a tank with neutralizing liquid and a control unit lj.

This installation works as follows.

When the spindle is moved downward, the container with the fluted parts is immersed in the solder bath. After the parts have been blown, the container is raised, a rotational movement is communicated to the spindle to remove excess solder. The container is then opened in a tank with a neutralizing liquid, into which the parts ejected by centrifugal force fall.

One of the main drawbacks of this device is the low quality of service for small parts (the presence on their surface of uncovered areas, as well as oxides and slag inclusions).

A coating device is known which contains a tinning and fluxing bath, a tank for a neutralizing solution, a spindle head with an abutment, mounted on a column and equipped with a perforated basket-type container made of non-wetted material, and a control unit 2.

15

This device is closest to the invention in its technical essence and the achieved result.

Claims (2)

However, the use of known devices is limited, since the design of the container reduces their technological capabilities. The walls of the container, made of a material that is not wetted by solder, must quickly have OTBepcrviH or grooves, the dimensions and shape of which cannot be larger than the size of the workpiece and at the same time less than a completely defined size (4–5 mm ), i.e., the minimum sizes of the parts serviced are limited by the size of the holes in the walls of the container. Reducing the diameter of these holes would make it impossible for the molten solder to penetrate quickly through them, since in the presence of non-wetted solder walls of the container openings, solder can penetrate through them only under the influence of hydrodynamic head forces in the absence of capillary forces. It is technically inexpedient to manufacture the entire container from the material wetted by the solder, since it will inevitably lead to its intense erosion in the molten solder and, as a result, changing the chemical composition of the latter, embrittlement of the coating of the serviced parts, deterioration of the wetting properties of the solder, will require frequent replacement of the container and etc. In addition, in these devices, fluted parts fall into a container with excessive amounts of flux (especially if parts such as hollow rivets are processed). , sleeves, t, e, having large internal cavities). This causes unjustified over-consumption of the flux, contamination of the environment with aggressive vapors, deterioration of working conditions, intense corrosion of installation parts, splashing of solder in the bath and its particles in the tank with a neutralizing liquid, as well as clogging of trimmed parts with foreign bodies. After service life, flux residues appear in the form of hard-to-remove slag cores and uncovered areas that are sources of corrosion. The aim of the invention is to improve the quality of the applied coatings. This is achieved by the fact that the container is equipped with a valve made in the form of a perforated plate of a material wetted by solder, the column is equipped with a cam, and the stop with a switch connected to the control unit, while the cam is installed with the ability to interact with the chat; In addition, the spindle can be made with a spring-loaded cover of the other heat-resistant material. FIG. 1 is a schematic diagram of the proposed device; in fig. 2 shows the container section; in fig. 3, 4 - scheme of the container. The device includes a spindle mount 1 with an emphasis 2, a cantilever mounted-on column 3 and equipped with a drop-down container 4, a bath 5 of a freeze and a flux bath 6, a container 7 with a neutralizing solution and a control unit 8. On the console 9 of the spindle head 1 a container drive 10 is installed 4. The console 9 has the ability to vertically move along the column 3 with the lead screw 11 receiving rotation from the actuator 12 mounted on the base 13. A switch 15 is mounted on the stop 2 connected to the base 13 by spring 14. The stop 2 has a groove 16, the nail that passes through the cam 17 fixed on column 3, Spindle head 1 is provided with a lid 18 made of heat-resistant rubber 1.5 mm thick, sandwiched between two metal washers 19c with a spring 20. Reflector 21 is installed on container 7 with neutralizing solution. Perforated container 4 is leached out of material that is not wetted by low-temperature solder (titanium, stainless steel) and consists of a cover 22 and a stick 23 mounted on the shaft 24 with a screw 25, which can be vertically moved relative to the tube 26. Tara Single 23 pressed to the lid 22 by a spring 27. The large openings in the bottom taredki closed valve 28 made of solder-wettable material having openings less than the dimensions of workpieces (e.g., nickel grid with 0.1 mm cell). The device works as follows. In the initial position, the container 4 is opened and installed above the bath 6 with the flux. The parts to be processed are loaded into the container 4 into the plate 23. The drive 12 is turned on, which rotates the lead screw 11, which moves the spindle head 1 downwards. In the process of moving, the stop 2 hangs on the cam 17, which, interacting with the switch 15, includes the flux cycle program (see Fig. 1, the dotted line shows 5729 but the position of the stop 2). In the process of moving the plate 23 under the action of the spring 27 is pressed against the lid 22 In the closed form, the container 4 is lowered into the bath 6 with a fpus, while the lid 18 is elastic inside the bath 6 under the action of the spring EL-20 and hangs in it, isolating the fluxing zone from the environment. Having reached the lower position (see position A in FIG. 4), the spindle head 1 stops; a slow rotation of the container 4 from the drive Y begins. Flux, penetrating through the perforations in the walls, holes in the bottom and through the valve 28, wets the workpieces. After some time, the command from the control unit includes the reverse of the drive motor 12 and the spindle head -1, together with the container 4, is raised. After the separation of the bottom of the plate 23 from the flux mirror in the bath 6, the actuator 1O rotates rapidly (see position B in Fig. 4). The excess flux is removed from the parts through the perforations of the container 4 under the action of centrifugal forces (rotational speed ZOOO r / min). At the same time, the lid 18 closes the bath with the fuse, excluding the ingress of droplets into the atmosphere. The duration of the fast rotation is 1-3 s. At the end of the fast rotation (see position B in Fig. 3), container 4, continuing to move upwards, lid 22 seizes cover 18 and returns to its original position, while shaft 24 abuts against stop 2, spring 27 is compressed and container 4 opens. The container 4 is at this time above the bath 5. The switch 15 makes the corresponding switch in block 8 The head 1 moves down the column 3 following the console 9 under the action of the spring 14. The cam 1.7 does not prevent this, because 16 on the stop 2. As a result of this movement, the stop 2 takes the position shown in FIG. 1 with a solid line. Then the container 4 is closed under the action of the spring 27. The console 9 continues to move downwards. Having reached the lower position (see position A in Fig. 3), the plate 23 is immersed in the solder of the bath 5 and begins to slowly rotate (1 - 1.5 rps) from the actuator 1O. Solder, penetrating through the large holes in the bottom of the plate 2.3 vi CKBO3F dampened valve 28, serves the workpieces. The elastic cover 18 under the action of the spring 20 enters inside the bath 5 and hangs in it, isolating during treatment the zone of tinning from the environment. When the end of the machined parts is finished in the solder, the reverse of the drive 12 is turned on and the spindle head 1 begins to rise. After separation of the bottom of the plate 23 from the mirror, the solder actuator 1O is switched to fast rotation and the excess solder is discharged through the perforations of the container 4 and flows down into the bath 5 (see position B in Fig. 3). The lid 18 prevents the dropping of solder droplets from the bath 5. At the next lift, the container 4 continues to rotate rapidly and, coming out of the bath 5 with solder, opens (see position B in Fig. 3), as the shaft 24, having reached the stop 2, moves with the plate 23 fixed on it, compressing the spring 27. The parts to be processed under the action of centrifugal forces leave the plate 23, hit the reflector 21 and fall into the tank 7 with the neutralizing solution. The cover 18 at the same time closes the hole in the reflector 21, preventing the accidental ejection of parts upwards. Upon further raising of the spindle head 1, the console 9 abuts against the stop 2 and rises together with it to its original position, while the fast rotation stops (see position D in Fig. 3). A mesh bunker (not shown) is installed in the tank 7 with the neutralizing solution, in which the trimmed parts are assembled. The device, providing high quality processing of small parts, allows to simplify the operation of loading parts into a container, to improve the working conditions of staff, since the treatment area during operation is isolated, and to ensure minimal emission of toxic flux vapors into the atmosphere. Claims of invention j. A coating device containing wounding and fluxing, a tank for a neutralizing solution, a spindle head with a stop mounted on the column and equipped with a perforated basket-type container material to be soldered, and a control unit, characterized in that, in order to improve the quality of the applied coatings, the container is equipped with a valve made in the form of a perforated plate of the material wetted by solder, the column is equipped with a cam, and the stop is connected to the control unit when This cam is interoperable with the switch. 2. The device according to claim 1, characterized in that the spindle is filled with a spring-loaded cover made of an elastic heat-resistant material. Sources of information taken into account in the examination 1. The patent of Sweden No. 329312, cl. 48 B 1/04, 1970. 10 2. USSR copyright certificate .№ 543686, cl. C 23 C 1/14, 1974. tgpd 444Л