RU2606395C2 - Method of producing printed cables - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to production of printed cables. Proposed is a method of producing printed cables with parallel and rectilinear conductors on an insulating substrate by electrochemical processing comprises the operations of making a multiple billet with forming conductors under the action of process voltage on a length specified by marks on a rolled billet, then the voltage is removed without the billet movement. Herewith a non-processed billet section is left, then the process voltage is switched on again. And from non-processed sections of the billet subsequently during cutting along the outline of the printed cable formed are contact sites or contact tabs.

EFFECT: possibility of forming a printed cable with contact sites or contact tabs in a billet roll for their installation in various equipment, that leads to reduction of weight and dimensions of the equipment.

4 cl, 3 dwg

Description

The invention relates to the manufacture of printed cables, and more particularly to the manufacture of printed cables with contact tabs for electrical installation, including screw mounting.

As a rule, in electrical radio equipment, electrical installation of printed cables is carried out by soldering.

However, in some cases, there is a technological need to carry out the electrical connection by mechanical pressing of the cable contact with a screw. This method of wiring is used when connecting to installation elements with screw contacts (contactors, some types of relays, switches, etc.) or when wiring explosive elements, such as electric igniters.

Typically, printed cables, as a special case of printed circuit boards, are manufactured on a unified technological equipment for the production of printed circuit boards.

GOST 10317 in paragraph 2 establishes the dimensions of the printed circuit boards: "The maximum size of either side should be no more than 470 mm."

The current level of technological development allows us to produce flexible printed cables with parallel and rectilinear conductors up to several meters long. So, for example, US patent No. 3239441, CL. 204-143, publ. 03/08/66, A.S. USSR No. 911748, H05K 3/06, publ. 03/07/82, these methods allow you to form only rectilinear and parallel printed conductors on a long flexible insulating substrate with a rapidly rotating electrode-tool due to the anodic dissolution of copper foil.

The closest in technical essence is the method of manufacturing printed cables according to the patent of the Russian Federation No. 2343813 C1, H05K 3/16, publ. December 27, 2008, adopted by the authors for the prototype, in which, after the formation of the printed conductors on the roll stock, operations are performed to cut the group blank into individual specific printed cables.

The objective of this technical solution (prototype) was to increase manufacturability and, accordingly, processing productivity, ensure the reliability of the electrical strength of the insulation and high performance characteristics of the cable as a whole, as well as reduce the complexity of manufacturing printed cables in a roll stock.

It should be noted that this method allows to produce rolls of a long printed cable only with parallel and rectilinear printed conductors.

Thus, the objective of this technical solution is the manufacture of a long printed cable with contact tabs.

Common features with the method of manufacturing a flexible printed cable proposed by the authors is the presence of a rolled blank of foil dielectric on a flexible insulating substrate, dimensional electrochemical processing with a rapidly rotating electrode-tool during the formation of a group of printed conductors under the influence of technological voltage, followed by cutting along the contour.

In contrast to the prototype, in the method of manufacturing a flexible printed cable proposed by the authors, a group of printed conductors is formed by applying technological voltage to the electrode-tool along the length of the printed conductors specified by the marks on the roll blank, then the technological voltage is removed without stopping the movement of the blank, while leaving a portion of the raw foil dielectric, after which the process voltage is again turned on for shaping the next group of printed conductors, and cutting the contour of the printed cable from untreated foil portions forming the dielectric pads.

In the particular case, that is, in specific forms of execution, the invention is characterized by the following features:

- without technological stress form a portion of the roll stock of at least twice the length of the contact pads;

- contact pads are in the form of contact petals;

- before cutting along the contour in the untreated areas of the foil dielectric, contact or mounting holes are formed.

It is this that allows us to conclude that there is a causal relationship between the totality of the essential features of the claimed technical solution and the achieved technical result.

These signs, distinctive from the prototype and to which the requested amount of legal protection applies, are sufficient in all cases.

The objective of the invention is the possibility of forming a printed cable with galvanically connected contact pads or contact petals in the roll of the workpiece.

When carrying out the invention, the indicated technical result is achieved in that, in contrast to the known method (prototype) for the manufacture of printed cables with parallel and rectilinear conductors in a rolled blank of a foil dielectric on a flexible insulating substrate by the method of dimensional electrochemical processing with a rapidly rotating electrode-tool, including forming operations at least at least one group of printed conductors under the influence of technological voltage and subsequent cutting according to the contour, the peculiarity is that a group of printed conductors is formed when a technological voltage is applied to the tool electrode at the length of the printed conductors specified by the marks on the roll stock, then the technological voltage is removed without stopping the movement of the workpiece, while leaving a portion of the untreated foil dielectric, after which the process voltage is again turned on for the shaping of the next group of printed conductors, and when cutting along the contour of a printed cable from unskilled These areas of the foil dielectric form contact pads.

A new set of essential features, as well as the presence of a relationship between them:

- due to the manufacture, when the process voltage is applied, the group of printed conductors at the length specified by the marks allows the formation of printed conductors of the required length;

- after removing the process voltage without stopping the movement of the workpiece, a portion of the untreated foil dielectric remains, which ensures the preservation of the galvanic connection between the printed conductors and the untreated portion of the foil dielectric;

- re-enabling the process voltage without stopping the movement of the workpiece after performing the untreated part of the workpiece allows you to shape the next group of printed conductors, also galvanically connected with the untreated part of the workpiece;

- cutting along the contour of the printed cable allows you to form wider contact pads in the form of petals or galvanically combine single-potential printed conductors with a contact pad from the untreated sections of a foil-coated dielectric, due to interconductor gaps.

Signs characterizing the invention in specific forms of execution, allow, in particular, due to:

- execution of a plot of at least double the length of the contact pads without technological voltage, to ensure that the roll of the workpiece has the repeatability of manufacturing printed cables corresponding to the drawing, in the case of manufacturing a printed cable with a two-sided arrangement of contact pads with the rational use of the workpiece material;

- the implementation of the contact pads in the form of contact petals to expand the field of application of printed cables, because holes are made in the contact petals for mounting “screw”, to expand the scope of printed cables;

- the formation in the untreated areas of the foil dielectric contact or mounting holes can improve the manufacturability of this operation by performing it in a single roll of the workpiece.

Signs that distinguish the proposed technical solution from the prototype are not identified in other technical solutions and are not known from the prior art in the process of conducting patent research, which allows us to conclude that the invention meets the criterion of "novelty."

The essence of the invention lies in the fact that in a method for the manufacture of printed cables with parallel and rectilinear conductors in a rolled blank of a foil dielectric on a flexible insulating substrate by the method of dimensional electrochemical processing by a rapidly rotating electrode-tool, which includes forming operations of at least one group of printed conductors under the influence of technological voltage and subsequent cutting along the contour, in contrast to the prototype, according to the invention, a group of printed wires the dies are shaped when a technological voltage is applied to the electrode-tool on the length of the printed conductors specified by the marks on the roll blank, then the technological voltage is removed without stopping the movement of the workpiece, and a portion of the raw foil dielectric is left, after which the technological voltage is turned on again to form the next group of printed conductors and when cutting along the circuit of the printed cable from the untreated sections of the foil dielectric form a contact e site.

The essence of the invention is illustrated by drawings, where in FIG. 1, 2, and 3 show a sequential conversion from a roll stock to a printed cable when implementing the proposed method for manufacturing a printed cable with contact tabs.

FIG. 1 - a roll blank with groups of printed cables, FIG. 2 is a processing circuit along the circuit of a printed cable, FIG. 3 - finished printed cable.

In FIG. 1 shows a portion of a roll blank 1 of flexible foil dielectric with shaped groups of printed conductors 2 of the required length, between which there are interconductor gaps 3 from the insulating substrate of the foil dielectric, and between groups of printed conductors 2 there are sections of untreated foil 4. Along the side edges of the roll blank 1 may remain side edges 5 of raw foil dielectric.

In FIG. 2 dashed lines 6 show the circuit processing (pattern) of individual cables of FIG. 3 and their contact pads 7 with the necessary holes 8.

In FIG. 3 presents one of the constructive options for a long printed cable, manufactured by the proposed method, where at the ends of the printed conductors 2 are located galvanically connected to the latter contact tabs 7, with holes 8, and on the sides of the printed conductors 2 there is insulation from interconductor gaps 3.

The proposed method for the manufacture of printed cables with pads is implemented as follows.

Previously, a roll of foil-coated dielectric is marked with transverse marks along the required length of the printed conductors and doubled dimensions of the contact petals specified by the drawing or several drawings.

Next, the roll is fed into the electrochemical processing machine for its rewind during operation from the transferring cassette to the receiving one through the working chamber. The machine operator, during the movement of the tape and when combining the first line marking the tape with a pointer on the machine, turns on the supply of process voltage. This starts the formation of a group of printed conductors of the same length.

When combining the second mark with the pointer on the machine, the operator turns off the process voltage while maintaining the movement of the workpiece. In this case, the workpiece processing is terminated, and a portion of untreated foil remains on the roll. The combination of the next label with the pointer leads to a repetition of the above cycle.

The invention can be used in the manufacture of printed cables with contact pads for their installation in various equipment, which will reduce the weight and dimensions of the equipment, as well as increase its reliability in general and reduce the complexity of manufacturing.

The indicated positive effect is confirmed by the manufacture for a number of products of experimental batches of flexible printed cables with contact pads and contact petals, implemented in accordance with the invention.

Currently, technological documentation has been developed, the necessary equipment has been manufactured, state tests have been carried out, and mass production has begun.

Claims (4)

1. A method of manufacturing printed cables with parallel and rectilinear conductors in a rolled blank of foil dielectric on a flexible insulating substrate by the method of dimensional electrochemical processing by a rapidly rotating electrode-tool, which includes forming operations of at least one group of printed conductors under the influence of technological voltage and subsequent cutting according to a circuit, characterized in that a group of printed conductors are formed when a technolog voltage along the length of the printed conductors specified by the marks on the roll stock, then the technological voltage is removed without stopping the movement of the workpiece, while leaving a portion of the raw foil dielectric, after which the technological voltage is turned on again to form the next group of printed conductors, and when cutting along the circuit of the printed cable from the untreated sections of the foil-coated dielectric, pads are formed. 2. The method according to p. 1, characterized in that without technological voltage form a section of the workpiece at least twice the length of the contact pads. 3. The method according to p. 1, characterized in that the contact pads are formed in the form of contact petals. 4. The method according to p. 1, characterized in that before cutting along the contour in the untreated sections of the foil dielectric contact or mounting holes are formed.

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