DD160317A3 - HOLDING DEVICE FOR OBJECTS TO BE WORKED WITH ELECTROLYTIC OR CHEMICAL SURFACE TREATMENTS OR METAL STEAMING TECHNOLOGY - Google Patents

Abstract

Production of holding devices for electrolytic and chemical vapor deposition processes within printed circuit board production. The invention has the aim of producing a universal holding device for various chemical surface treatment and metal coating processes that is suitable for the production of plated-through printed circuit boards, non-plated printed circuit boards and flexible printed circuit boards and can be produced with low material and production costs. Holding devices, which clamp printed circuit board blanks over the end faces in springs, have to be removed because of the flexibility of different base materials. The invention enables the production of fixtures for processes within the PCB manufacturing, which require less material and manufacturing effort compared to the known solutions. The holding devices are universally applicable for the mentioned manufacturing processes and for the products to be produced by plated printed circuit board, non-plated printed circuit board and flexible printed circuit board independent of the base material used. The invention according to exemplary embodiment 2 makes it possible to clamp printed circuit boards in two planes. Application: PCB production, surface treatment of flat objects.

Description

Description of the Invention "

^a ) title of the invention;

"Holding device for electrolytic and chemical surface treatment as well as for metal vapor deposition technology"

b) application s Field of the Invention

The invention relates to a structurally and manufacturing technology simple holding device for electrolytically, chemically or by Metallevampfungstechnik objects to be treated, Dig application in the original operation is proposed for the production of ^ printed circuit boards by semi-additive or subtractive method and for PCB thinning,

c) Char akteriatik_ de_r__bekannte- technical solutions

The prior art is in the field of holding devices for the electrolytic or chemical surface treatment bzTS. For. the steam extraction technique is characterized by different systems *

The trapping of the objects to be treated into elastic springs is widespread. Surface-formed objects (s, B. printed circuit boards, sheets us w ·) are often clamped by springs between the faces «This has the disadvantage that with changed dimensions of the objects each new fixtures must be made. By correspondingly large spring travels constructive solutions were created, which are suitable for objects in a certain area of the. Dimensions are suitable. The disadvantage of an insufficient use of space in the plants, "the lax part of the inventory" of an assortment of clamping racks and the disadvantage of the loading of the objects to be treated by the force of the clamping springs remain in principle in this system. "

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Another possibility is to clamp by feathered objects, the clamping is not carried out between the end faces, but at the edge of plates, sheets or sheets. In printed circuit board manufacture are mainly plates from 0.1 to 2 mm thickness with uniform ₉ 0 '' of the element Fe en clamped

Other holding devices are constructed of fork-shaped clamping elements, wherein on a leg of the clamping elements, a thread and a clamping screw are provided. The solutions known according to this system are structurally and production-technically complicated. Particular problems are that the clamping system 3o must work that as possible no electrolyte carryover occurs and no detrimental metal deposition occurs on the clamping screws · In addition to the complicated encapsulated Klemmsysteinen open Klemni3ysteme have been developed with clamping screw, with metallic Einsteckgabel and plastic clamping screw _a . The squeeze fork is coated together with the frame bars in accordance with generally known methods with an electrolyte-resistant plastic, with the contact area being cut free. Replacing damaged clamping elements requires a completely new insulation. ,

In another previously known solution, the plastic-coated metal Einsteckgabel is replaced by a plastic molded part with metal insert, »The attachment of the Plastformteiles on the frame rod is carried out with a conical contact screw formed, the contact screw with its Kegelman-, telflache serves as a contact surface. The conical contact screw is arranged opposite the clamping screw and absorbs the clamping force * '

The main disadvantage 'of the latter solution is that the conical contact screws and the plastic moldings require a high production cost. The attachment to the Gesteilstab'mittels screw thread causes wear of the threaded holes, if the material of the rack rod is attacked by the technologically designed electrolyte solutions. , «.

The following references are given to the known technical solutions:

Author collective Manual Electroplating

Verlag Technik 1974

Hermann, H. PCB manufacturing

and processing

Leuze Verlag 1978 The mentioned methods have the following disadvantages:

- They are Ions truktiv and manufacturing technically complicated.

- They require special plastic injection tools *

- The production costs for special "Titanium Gel Screws are high * Tapping for the selected arrangement of threaded holes requires high precision»

- The assembly effort for mounting the Klemmelernente the gesture ils tab is high, '. /

- The material costs of the known solution are high «

d) The aim of the invention

The aim of the invention is to develop a constructive and production-oriented, simple holding device for printed circuit boards or other areal educated objects su and thereby exclude the disadvantages mentioned in the discussion of the known solutions · The holding devices should be regenerable by suitable chemical processes ·

e) Presentation of the essence of the invention . The technical task

The electroplated racks and fixtures used in the development plant in vapor deposition systems are designed according to the system - clamping the printed circuit boards between the faces »

This system has the disadvantages already described. Furthermore, the selection of substances is not suitable for chemical regeneration. ,

It is the object of the invention to develop a suitable holding device which can be used independently of the conductor plate size and permits optimum cleaning in kitchen baths. In addition, a chemical regeneration should be possible. , , ,

Features of the invention . -

The holding device according to the invention is characterized in that. two pins are fixed in the frame rod by press fitting, wherein the frame rod is pierced perpendicular to the longitudinal axis by means of a simple Bohrlehre "centered with a defined distance of the holes with each other, that sin simple mechanical prefabricated plastic part with clamping screw is placed on both sides of the rack rod protruding pins and through Spanning the pins is attached to the rack bar.

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NEN. of plates in the holding device of the end face, the shank of a clamping screw and the two lateral surfaces of the contact pins takes place.

The use of pins in the design structure has over the previously known. Contact screw with conical lateral surface manufacturing technical parts on door. The contact pins are cut from titanium wire in the winding operation. The use of pre-fixings over threaded mounting in the frame bar saves production time and allows a reduction in the bore diameter in the frame rod and thus a reduction in the frame rod diameter.

The use of two angled contact pins in a clamping element improves the contact reliability with respect to a contact screw and it is achieved a more stable attachment by triple support on the lateral surfaces of the contact pins and the end face of the shank of the clamping screw. In the embodiment 3, the support surface is further increased by a suitable shape of the plastic part, in particular to clamp flexible material and to allow the use of resistant metal screws,

f) Examples .

The invention will be explained in more detail below with reference to meherer execution examples.

The drawings Figure 1-3 show this holding device, Zp.r Pig, 1 is a section

In Pig · 1, a holding device for a printed circuit board plane consisting of rack bar (1), frame bar insulation (2), plastic part (3), contact pins (4) and clamping screws (5) is shown, in which one side a printed circuit board (7) is clamped. , ; , ·

The section AA to Pig, 1 shows the attachment of the plastic parts (3) on the frame rod (1) through the contact pins (4) »The contact pins (4) are fixed in the frame rod by PreSpassung, after attaching the plastic parts (3) on the contact pins (4) the contact pins (4) are unwound »

Pig * 2 specifies a holder for two printed circuit boards *. For this purpose, the section A-A shows the attachment of the plastic parts (3) by unwound contact pins (4) on Gesteila tab (1), '·. ",.

In Pig »3, a holding device is specified, which is particularly suitable for flexible printed circuit boards. The clamping force of the clamping screws (5) acts areally over a resilient tongue (6) of the plastic part on the clamped base material (?) ·

The holding device according to Pig, 3 can be used with resistant metal clamping screws £ 5) »because the clamping screws do not come into contact with the contact pins»

Claims (4)

Invention claims. ,. __.- ": ·." - · -. 1. Holding device for objects containing electrolytic. '-. or chemical surface treatments or with metalworking ^~: to be processed dajnpfungstechnik -dadurch in a £ that on a frame bar (1) with Kunststoffiso- ^ --regulation (2) mindestens'ein fork-shaped plastic part (3) - "with two attachment holes and a Clamping screw ^ C5) by two contact pins (4), which are unwound during assembly, are fastened in a form-fitting and replaceable manner. 2 .. holding device.after. Point T ₉ . characterized in that ,, "the holding device without ümkleimnen of the objects in loading '' dampfungsanlagen or chemical reduction EeSchichtungen;. · ^v" and in.- hereinafter 'galvanic ITachverstärkungsbädern ver ~ \ can be vend et. '. ".- '.:. -'3 "halt" crri.cht "ang after point 1, 'characterized ·· ,, that - Plates "according to Figure 2 izi several ϊΓοβηβη- can be clamped. - _. ^ '·'/"". · - '''"^; , ^: -, '-.'. , - '' 4 * Retention according to item 1, characterized in that '- the clamping screw' (5 ') via a tongue - (6) , - "nenden objects flächenhaf t.," and thus the ~ ''; '' clamping 'of flexible "plate vetrbessert.vri.rd,'. ' ''', As well as the /:. Yerwehdung of resistant metal clamping ^screws'; .. possible' If '' .. -, '.' .. '.. ·, ^ -; .. · / - · "'". , = ./ ';;.. ^: - ·; ":';.'_.'. -./- ,. For this "^ .." pages Zelduiungen . Ϊ́1932 * θ52Β8β '.