CN1122120C

CN1122120C - Processing method and device for drum electroplating

Info

Publication number: CN1122120C
Application number: CN 99116489
Authority: CN
Inventors: 张华�; 谢锐兵; 徐邦义; 叶昌祺; 李捷; 付志勇
Original assignee: 谢锐兵
Priority date: 1999-05-25
Filing date: 1999-05-25
Publication date: 2003-09-24
Anticipated expiration: 2019-05-25
Also published as: CN1236024A

Abstract

The present invention relates to a processing method and a device thereof for rotary drum electroplating. The method comprises the following steps: processed workpieces are put in an electroplating rotary drum to be put in electroplating bath solutions together, and the processed workpieces and a conductive rod of the negative electrode are switched on; the positive electrode and the conductive rod of the negative electrode of an electroplating bath are respectively switched on with the positive electrode and the negative electrode of a power supply; and the electroplating rotary drum alternately rotate in the forward direction and the reverse direction in the processing processes. The device is an electroplating rotary drum with the functions of forward rotation and reverse rotation. The processing method can obviously improve the dissolution effects of the positive electrode, reduce bath voltage and energy consumption and effectively enhance the processing quality and the yield of barrel plating.

Description

A kind of working method of barrel electroplating and device thereof

The present invention relates to a kind of working method and device thereof of barrel electroplating, it can effectively improve the processing quality and the yield rate of barrel electroplating.

Barrel electroplating is a kind of plating processing mode that is suitable for medium and small metal parts of routine, it is put pack into the electroplating rotary drum that has liquid-through hole of processed medium and small metal parts in the bath solution into together then and processes, electroplating rotary drum needs ceaselessly rotation in the course of processing, ceaselessly stir and stagger so that overlay part in the electroplating rotary drum, so that each part obtains the uniform overlay coating of thickness.Yet, electroplating rotary drum in the past all is to adopt the mode of folk prescription to rotation adding man-hour, promptly in the whole course of processing, electroplating rotary drum is all the time towards a direction rotation, like this, just some following problems have appearred: 1, part in the drum always inherent is crossed anode near one side anode away from another, so distribution of current all concentrates on the anode of near-end, this causes anode passivation easily, particularly in alkaline coating bath, as alkaline non-cyanogen galvanization, the alkalescence cyanide electroplating, in the alkalescence tin plating solution, anode passivation is obvious, causes bath voltage to raise, the dissolving of anode metal is hindered, solute effect reduces, and the too high electric energy consumption that also can cause of bath voltage increases, and the organic additive branch in the tank liquor solves drawbacks such as too fast.2, the upset owing to workpiece in the electroplating rotary drum is that folk prescription is to orderly, the upset degree is limited, exist " dead angle " of negative electrode conduction, can cause the degree of stirring not enough for gossamery workpiece especially, mutually paste, or paste with drum, card is stung etc. disperses bad phenomenon, the position of pasting is easy to form that coating is thin, bad order, even the problem of plating leakage, and the uneven problem of coating outward appearance is particularly outstanding, electroplating evenness and yield rate are difficult to be improved.

The objective of the invention is provides a kind of machining status that can improve barrel electroplating at above-mentioned existing problem, makes the quality of barrel electroplating processing and working method and the device thereof that yield rate effectively improves.

The technical scheme that realizes working method of the present invention is: put in the bath solution together the work piece electroplating rotary drum of packing into then, work piece and the conducting of negative electrode conducting rod, anode in the plating tank and negative electrode conducting rod are conducted with the positive and negative electrode of power supply respectively, and its difference is that electroplating rotary drum carries out the alternately rotation of forward, negative sense in the course of processing.

Press such scheme, situation according to processing parts, the rotating speed of electroplating rotary drum in bath solution is 3-18 rev/min, normal revolution is 8-12 rev/min, be 10-600 second/each the switching time of forward and reverse rotation, promptly is rotated in the forward 10-600 second, is converted to reverse rotation 10-600 second thereafter, with this alternate cycles, be 90-180 second/each switching time commonly used.

The device of realizing working method of the present invention is a kind of electroplating rotary drum with positive and negative spinfunction: include drum suspension bracket 1, be installed in the drum body 8 of drum suspension bracket below, be installed on negative electrode conducting rod 2 in the both sides of drum suspension bracket, the negative electrode conducting rod links by the intravital negative electrode conduction of cathode wire 7 and drum stone roller, be installed on the speed-changing driving device that links with the drum body above the drum suspension bracket, its difference is that speed-changing driving device and rotating regulating and controlling device 6 link.

The present invention realizes the forward and reverse rotation of electroplating rotary drum by adopting rotating regulating and controlling device, and it can determine the forward and backward cycle and the rotating speed of drum neatly according to workpiece size, geometric features, to reach the best upset efficient of workpiece.The present invention can make the anode of drum both sides can alternately participate in the dissolving conduction when electroplating, and has so not only disperseed anodic current density, has prevented anode passivation, thereby has improved anode dissolution efficient, and bath voltage is descended, and plays the effect of saving electric energy consumption.On the other hand, forward and reverse rotation of electroplating rotary drum, workpiece in the drum is overturn fully, increased the dispersing uniformity of workpiece in drum, can more effectively prevent the generation of the bad phenomenons of dispersion such as workpiece is pasted, card is stung, make the coating outward appearance of each workpiece even, improved the yield rate of barrel electroplating, thereby the processing quality of whole barrel electroplating is improved and improves.

Fig. 1 is the front view of an embodiment of apparatus of the present invention.

Fig. 2 is the side-view of Fig. 1.

Fig. 3, Fig. 4 for the present invention forward and reverse when rotation work piece with the state graph of the mutual alignment variation of electrode.

Below describe embodiments of the invention in detail.

Embodiment 1: in 500 liters of cyanide electroplating grooves, the hexagonal electroplating rotary drum of middle placement, both sides hang with the electrolytic copper anode, and the flaky irony workpiece of φ 18 * 1 circles is housed in the electroplating rotary drum, and the workpiece total amount is 10kg, control current intensity is 90 peaces, the electroplating rotary drum rotating speed is 8 rev/mins, the turnaround time of forward and reverse rotation be 180 seconds/each, 40 minutes barrel plating time, with the same terms but the barrel plating of unidirectional rotation compare, it the results are shown in following table:

Rotation mode	Bath voltage in the groove during electric current 90A	Anode surface situation during plating	Mean thickness	Edge and center thickness are poor	The outward appearance yield rate
Rotation mode	Bath voltage in the groove during electric current 90A	Anode surface situation during plating	Mean thickness	Edge and center thickness are poor	The outward appearance yield rate	Unidirectional rotation	11.5 volt	The anode blackout of nearly workpiece seriously has black slag to come off, the far-end copper	3μm	2μm	85％
Forward and reverse rotation	7.5 volt	The anode on both sides all presents uniform copper	3.5μm	1	98.5％	Unidirectional rotation	11.5 volt		3μm	2μm	85％

Embodiment 2: in 680 liters of alkaline pots, the hexagonal electroplating rotary drum of middle placement, both sides hang with the pure tin anode, and 24 * 8 * 1 long flaky red copper workpiece is housed in the electroplating rotary drum, and worker's total amount is 18kg, control current intensity is 100 peaces, the electroplating rotary drum rotating speed is 12 rev/mins, the turnaround time of regulating forward and reverse rotation be 90 seconds/each, 60 minutes barrel plating time, with the same terms but the barrel plating of unidirectional rotation compare, it the results are shown in following table:

Rotation mode	Bath voltage in the groove during electric current 90A	Anode surface situation during plating	Mean thickness	Two ends and central thickness are poor	The outward appearance yield rate
Rotation mode	Bath voltage in the groove during electric current 90A	Anode surface situation during plating	Mean thickness	Two ends and central thickness are poor	The outward appearance yield rate	Unidirectional rotation	5 volts	The anode blackout of nearly workpiece has very thick passive film, and workpiece anode color far away is normal	5μm	5	75％
Forward and reverse rotation	4.5 volt	The anode on both sides all presents normal color	6μm		3	Unidirectional rotation	5 volts		5μm	5	75％	99％

Embodiment of apparatus of the present invention such as Fig. 1, shown in 2, has drum suspension bracket 1, below the drum suspension bracket, be equipped with drum body 8, the drum body is a regular hexagon, one side of drum body links by driving gear set 3 and the speed-changing driving device that is installed in drum suspension bracket top, speed-changing driving device is made of wheel box 4 and motor 5, one rotating regulating and controlling device 6 can be set on the drum suspension bracket, connect with motor and to be used for controlling rotating speed of motor and commutation, be installed on negative electrode conducting rod 2 in the both sides of drum suspension bracket, the negative electrode conducting rod links by the intravital negative electrode conduction of cathode wire 7 and drum stone roller 12, and rotating regulating and controlling device of the present invention can be regulated the rotating speed and the rotating of electroplating rotary drum turnaround time arbitrarily.Plating adds man-hour, and the work piece 11 of packing in the electroplating rotary drum is put in the bath solution 10 then together, and the both sides of electroplating rotary drum hang with anode 9 in bath solution, and anode and negative electrode conducting rod are conducted with the positive and negative electrode of power supply respectively.

Claims

1, a kind of working method of barrel electroplating, put in the bath solution together the work piece electroplating rotary drum of packing into then, work piece and the conducting of negative electrode conducting rod, anode in the plating tank and negative electrode conducting rod are conducted with the positive and negative electrode of power supply respectively, it is characterized in that electroplating rotary drum carries out the alternately rotation of forward, negative sense in the course of processing.

2, by the working method of the described barrel electroplating of claim 1, it is characterized in that the rotating speed of electroplating rotary drum in bath solution is 3-18 rev/min, be 10-600 second/each the switching time of forward and reverse rotation.

3, by the working method of the described barrel electroplating of claim 2, it is characterized in that the rotating speed of electroplating rotary drum in bath solution is 8-12 rev/min, be 90-180 second/each the switching time of forward and reverse rotation.

4, a kind of electroplating rotary drum with positive and negative spinfunction, include drum suspension bracket (1), be installed in the drum body (8) of drum suspension bracket below, be installed on negative electrode conducting rod (2) in the both sides of drum suspension bracket, the negative electrode conducting rod links by the intravital negative electrode conduction of cathode wire (7) and drum stone roller, above the drum suspension bracket, be installed on the speed-changing driving device that links with the drum body, it is characterized in that speed-changing driving device and rotating regulating and controlling device link.

5,, it is characterized in that drum body one side links by driving gear set (3) and the speed-changing driving device that is installed in drum suspension bracket top by the described electroplating rotary drum of claim 4.

6,, it is characterized in that described speed-changing driving device is made of wheel box (4) and motor (5) by the described electroplating rotary drum of claim 4.