CN1396314A

CN1396314A - Process for preparing PC anode copper

Info

Publication number: CN1396314A
Application number: CN 02124991
Authority: CN
Inventors: 吴国仕; 李倬
Original assignee: NANFANG SPECIAL COPPER MATERIALS CO Ltd GUANGDONG
Current assignee: NANFANG SPECIAL COPPER MATERIALS CO Ltd GUANGDONG
Priority date: 2002-06-26
Filing date: 2002-06-26
Publication date: 2003-02-12

Abstract

A process for preparing PC anode copper ball features that on the basis of ordinary ball forging machine, an automatic coil rod stretching anit and synchronous straightening unit are additionally used, and the cold-work processing is used for fining-off of crystal grains of raw copper rod, and a complete set of production technique for producing copper balls from preparing rod blank to upsetting method for making balls is formed.

Description

A kind of production method of PC anode copper ball

A kind of production method of PC anode copper ball.This product technology includes the non-ferrous metal rolling processing and the playing skill art is made in rammer.This product mainly is used as the anode material of printed-wiring board (PWB) circuit communication and wiring board panel plating, is one of base mateiral of electronic information manufacturing industry.This product processes purpose provides high-density, low cost, the high quality P C anode copper ball of little endless belt.

PC anode copper product is nearly ten years a kind of new copper phosphorus alloy materials that grow up, and the balling-up technology all is to adopt the horizontal continuous casting billet bar usually both at home and abroad at present, directly cold-heading balling-up, and its product processes flow process is simple, and production cost is low.But product ball surface is prone to serious tangerine peel (concavo-convex elephant skin) and the irregular phenomenon of endless belt, and surface quality can't satisfy the requirement of high quality wiring board plating, easily produces point discharge in the wiring board electroplating process, causes coarse mist of wiring board plate face and brightless; Cast not easy-clear of bar surface adhesion thing simultaneously, easily cause bur to be pressed in the ball, cause that the anode sludge increases in the printed-wiring board (PWB) plating tank, the electroplating quality that influences wiring board descends and the rising of production cost.This series products can only be suitable for the production of single printed on both sides wiring board, and can't satisfy the production requirement of high-performance multilayer wiring board.Given this, the first base bar of continuous up-casting (or horizontal casting) dish is adopted in the design of this product manufacturing technology, through strip off the skin, after the cold rolling drawing multi-pass processing, base bar surface inclusion is thoroughly removed,, made that the base bar is cold does sclerosis simultaneously through multi-pass cold working plastic deformation, impel the intensity of crystal grain broken refinement raising base bar simultaneously, hardness and surface smoothness, especially remarkable to cold punching type ability and the endless belt homogeneity effect that improves the base bar, in the production practice process, further verified.

Its product rammer system method is, according to the metal volume invariance principle, determine the base shank diameter with produced spherical diameter size and the long ratio of blank (upsetting is than≤2.5), calculate the theoretical length of the required blank of blank, adjust blank gag lever post (both charge length) with reference to theoretical length, related die and matching component and production ball size and supporting being consistent of base bar size, tool and mould satisfies the coordinating size requirement in the system process of guaranteeing to upset.On draw (or level) continuous casting copper bar must be through tandem rolling---connect and pull out the cold sclerosis processing of doing, Chemical Composition, physicals and dimensional inspection are qualified, the base club head, section is polished into the obtuse angle and removes deburring with hand-operated tools, then through the synchronous straightener aligning of numerical control, by ball upsetting machine pinch roller groove, conduit, pass the loose tool otch to the spacing place of blank stock, can start the ball upsetting machine examination upsets, ball warp size detection that examination is upset out and surperficial plumpness detect, tolerance dimension is controlled between the 0.5-1.0mm, and surperficial plumpness refers to that the elephant skin point is not more than 3% of surface-area.Plumpness mainly is to realize by base pole length size and base bar hardness (working modulus).Examination upset debug to the ball product qualified after, can change continuously normal rammer ball production over to.The tandem rolling that reaches serialization drawing, aligning, rammer ball connects the production line of upsetting, realize the raising of productivity and the reduction of cost, simultaneously through strip off the skin, cold rolling, drawing processing, visual appearance is further enhanced in the product, especially product density and plumpness improve significantly, endless belt obviously reduces than the production of casting bar and evenly, reaches the like product international most advanced level.

The production of this product is the regeneration product that processed-type PC anode copper ball replaces cast moulding PC anode copper ball, and quality scale and the production of high-performance printed-wiring board (PWB) that promotes PC anode copper ball product is had the effect of actively promoting.Visual appearance that it is excellent and highdensity inner quality are that cast moulding PC anode copper ball can't be mentioned in the same breath.Simultaneously, in the production operation process, rammer ball forming process stabilizing, product surface quality is easy to control, can adapt to the demand of large-scale production.Scheduled production cost will be starkly lower than rolling balling-up cost, and quality is better than casting the bar system product of upsetting greatly, be present comparatively ideal PC anode copper balling-up technology.

The product adaptation scope: this products production technology also can adapt to the production of other copper alloy and non-ferrous metal ball product, especially adapts to the production of copper master alloy and fine copper ball.

The product suitable device: this products production technology adapts to various cold-headings or the continuous suite of equipment of hot rammer balling-up and is interrupted single devices, also can adapt to punching press shaping equipment.

Product specification: Φ 8.0-Φ 70mm

Copper base bar gauge lattice: Φ 6.0-Φ 60mm

Copper base bar is sheared material length: 20-70mm.

Product Chemical Composition (%)

The product class	Major ingredient (〉=)		Impurity composition (≤)
	Major ingredient (〉=)		Impurity composition (≤)							??Cu	????P	??Fe	??Pb	??Zn	??Ni	??Sn	??Sb	??Te
	The A product	??97.0-99.95	????0.04-0.065	??0.002	??0.002	??0.002	??0.0015	??0.0015	??0.001	??Cu	????P	??Fe	??Pb	??Zn	??Ni	??Sn	??Sb	??Te	??0.001
The B product	The A product	??97.0-99.95	????0.04-0.065	??0.002	??0.002	??0.002	??0.0015	??0.0015	??0.001	??99.95-99.99	????0.001	??0.002	??0.002	??0.002	??0.0015	??0.0015	??0.001	??0.001	??0.001

Effect:

Product density: 〉=8.95g/cm ³

Product plumpness: 〉=97%

Copper unit consumption :≤1003.5kg/t

Electricity unit consumption :≤600KWh/t

1 further specify with reference to the accompanying drawings below:

In accompanying drawing 1:

1---automatic draw drum 2---copper base bar 3---synchrodyne

4---straightener 5---ball upsetting machine pinch roller 6---loose tools

7---long 8---gag lever post 9---products of blank

With the cold headers balling preparation technique is that example describes, through Chemical Composition, cold doing (tandem rolling-drawing) the base bar that service check is qualified is placed in the automatic draw drum (1), base bar (2) head is polished with hand-operated tools (emery wheel or file) behind the wedge angle, adjusting blank blank long (7) is Theoretical Calculation length, base bar (2) head is penetrated straightener (4) pinch roller, then successively by ball upsetting machine pinch roller (5), loose tool (6), to gag lever post (8), check when each parts is errorless, can start shooting and try the rammer ball, check rammer ball surface appearance, key is that the adjustment of the concentricity of blank long (7) and left and right sides mould is crucial in this process, next is the property consistent with each other (synchronously) of synchrodyne and ball upsetting machine, and the stable synchronism of its process can realize by numerical control synchronous machine (3).Examination upset be adjusted to product qualified till, both can change continuously normal rammer ball production process over to.

Claims

1, a kind of production method of PC anode copper, copper base bar (2) is upset by rammer ball equipment and is made ball, it is characterized in that: on draw (or level) continuous casting copper base bar through the cold processing crystal grain thinning of doing that strips off the skin, automatically unwrapping wire (1), numerical control are aligned (4) synchronously, are upset and make ball (9) and form continuous balling-up production method.

2, according to this product adaptation described in the claim 1 in Cu-P anode: 97.0-99.95%Cu:0.03-3.0%P and pure copper anode: 99.90-99.99%Cu.Impurity element Fe, Pb, Zn are respectively less than 0.002%, and Ni, Sn are respectively less than 0.0015%, and Sb, Te are respectively less than 0.001%.