SU792330A1 - Method of manufacturing wound articles from insulated wire - Google Patents

Abstract

A method of making reeled articles of the insulated wire consists in reeling on the wire (2) from a releasing element (1) onto a carcass of a reeled article to be made, for example, a resistor (10) while continuously measuring the resistance of the resistor (10), which is being made, and stopping the process of reeling off the wire (2) at the moment of reaching the equality between the measured (Rx) and a sample (Ro) resistors. Before the reeling off is started the wire (2) is heated on the releasing element (1) in a heating device (3) up to a certain temperature which is then maintained during the whole process of reeling off, while the direct current is used as a measuring current.

Description

tori resistance of more than 10 mΩ leads to unacceptably large errors m.

The aim of the invention is to improve the quality of precision wound products.

This goal is achieved due to the fact that the wire is preheated at the output device, this heating is maintained during the entire process of the windings, and the outgoing device with the wire is used as a direct current coupling electrode of the reference (preset) and winding resistors source of measuring direct current signal. A coil (coil) with an electrically conductive surface onto which nugethane resistive wire is insulated is used as a release device.

The proposed technical solution is based on the experimentally established regularity that the resistance between the residential wire and the frame of the reel for microwires decreases when they are heated exponentially and for wires in glass insulation already at temperatures of 200-300 ° C said resistance does not exceed 1.0-5, 0 mOhm (depending on the group of wires). Such a change in resistance between the residential wire and the reel, or rather the change in the resistance Hc of the wire wound to the reel leads to the shunting of the resistance of the wire, and the resulting resistance of the winding on the reel between the beginning and the end of the entire wire is determined by a complex ratio.

FIG. 1-2 shows the equivalent electrical circuits of a heated reel with a vitrified microwire wound around it, respectively, in the firm of a triangle and a star; in fig. 3 - the equivalent circuit of the measuring circuit; in FIG. 4 is a block diagram of one of the possible devices that registers the proposed method.

In the general case, the donor bobbin 1 with the microconductor 2 wound on it can be represented by an electrical circuit (in Fig. 1), where H and K are respectively the beginning and the end of the microwire 2 wound onto the reel 1, B is the electrical contact from the electrically conductive surface of the reel 1 ,

 ftxHRgi- y- resistance between the conductive surface of the reel and, respectively, the beginning and end of the 1 microwire 2 marked on the reel, YPR resistance of the core of 1 microwire wound to the bobbin 2. After a simple type conversion of the circuit in FIG. 1, we obtain a three-dimensional circuit. resistors R f i ftj having a common point (see Fig. 2), that

It is possible to build a reliable and operable measuring circuit shown in FIG. 3. where Rg is an exemplary (predetermined) resistance and TH forms the reference arm of the measuring bridge, ftjj form the measured bridge resistance arm, R is the resistance included as a coupling electrode with the measuring voltage source EUYA and Rg are precision resistors included in the opposite shoulders formed by such a measuring bridge and equal to each other in resistance.

The balance of this bridge occurs when the conditions

(VR -,)) - fi5

given that the condition of the bridge balance is

It was established experimentally that when the reel 1 with microwire 2 is heated up to 200-300s of resistance (Fig. 1), the resistance difference between them in the entire heating range does not exceed 10% of their average current value and does not depend on the number of turns of the microwire 2 on reel 1 and its running resistance.

. Obviously, in the equivalent star (Fig. 2) there will be a relation. and thus the heated reel can be used as a communication electrode, where the resistance value of this connection does not exceed 15 mΩ.

Heating the reel 1 with the microwire 2 to a temperature above 300 ° C does not lead to a significant decrease in the insulation resistance of the microwire 2

(it is inexpedient to reduce both in terms of unjustified energy costs, and therefore, that local cohesion of the internal turns of the microwire 2 may occur locally on the reel 1 due to overheating.

When n; t) ew reels 1 with microwire 2 to a temperature below LV-V: and still large, as the difference between Limi, which, moreover, ife is stable and exceeds 10% of their average value in this ; htf that cannot provide winding of resistors over 10 mΩ in accuracy better than 1-2%.

Claims (2)

. A practical scheme, designed to produce high-resistance wire resistors, provides (see Fig. 4) a heating device 3 for heating the reel 1 with a microwire 2, a balance bridge indicator 4, an actuator 5 controlled by an unbalance signal and intended to act on the motor winding b, which carries out the rotation of the frame 7 of the winding resistor (RK) fixed in the collet 8. In the manufacture of resistors according to the proposed method provides for the following order docking operations. , A bobbin 1 with vitrified microwire 2 is installed in a heating device 3, preliminarily forming a galvanic contact between the beginning H of the microwire 2 and an electrically conductive surface P, electrically connected to one of the current conductors of the sample resistor R reels 1, the end of the microwire 2 are electrically connected to the current lead of the carcass 7 of a winding resistor (which is installed in the collet 8 electrically connected to the precision resistor The coil 1 with the microwire 2 is then heated to 200 — and this temperature is maintained for the entire winding time of the resistor (RX), which begins immediately after reaching the winding motor 6, which is connected kinematically with one of the collet 8. The cupping of the microwire 2 from the reel 1 is carried out in the base of the continuous measurement of the winding resistance to the frame 7 until it reaches the nominal (specified) value of R when the balance of the measuring bridge comes. When the bridge reaches the bridge, the actuator 5 switches off the winding motor 6 and winding thus stops. The microwire 2 is cut off and it is electrically contacted on another conductor of the frame 7. The coiled resistor (RX-) is removed from the collet 8 and a new frame is installed for winding the next resistor R ,. Claim 1. A method of manufacturing coiled articles from insulated wire, which consists in that the wire from the coiling device is coiled to the frame of the winding product. Its resistance, the measuring pass, the current to the chain of the manufactured product through the donating device are continuously measured and the coiling is stopped. at the moment of equality of resistance of the product being wound, the model is exemplified by the fact that, with a chain of improvement in the quality of precision clothing products, the donor device reaches the temperature at which Ora insulation resistance wires tion thereon reaches a value sufficient for reliable detection of the measurement signal on the manufactured. product, and maintain this temperature throughout the entire coiling process, and DC is used as the measuring. 2. The method according to claim 1, which is also distinguished by the fact that, in the manufacture of coiled articles from microwire in glass insulation, the heat transfer device is produced up to 200300 ° C. Sources of information taken into account in the examination 1. The author's certificate of the USSR 290236, cl. G 01 R 27/00, 1965. 2. USSR author's certificate number 246640, cl. H 01 C 17/00, ..