US3552168A - Apparatus for tempering springs in a spring spinning machine - Google Patents

Apparatus for tempering springs in a spring spinning machine Download PDF

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Publication number
US3552168A
US3552168A US730165A US3552168DA US3552168A US 3552168 A US3552168 A US 3552168A US 730165 A US730165 A US 730165A US 3552168D A US3552168D A US 3552168DA US 3552168 A US3552168 A US 3552168A
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US
United States
Prior art keywords
current
spring
speed
wire
spring wire
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Expired - Lifetime
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US730165A
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English (en)
Inventor
Lars Erik Svensson
Nils Lennart Wahlstrom
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Industrifjadrar AB
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Industrifjadrar AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Industrifjadrar AB filed Critical Industrifjadrar AB
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Publication of US3552168A publication Critical patent/US3552168A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F35/00—Making springs from wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating

Definitions

  • This invention relates to an apparatus in machines for bending or spinning springs, in which the tools for bending or spinning the springs have associated with them means which in connection with the shaping of the spring provide a heating thereof with the aid of electric current so that the spring is tempered, and the current causing the heating of the spring is caused to flow through the spring, whereby the spring serves as a resistance wire.
  • the features characteristic of this apparatus reside in that the intensity of the current causing the heating of the spring is regulated in relation to the speed of advancing the spring wire and that means are provided for respectively increasing and decreasing the current output linear ly with respect to the increase and decrease, respectively, of the speed of advance of the spring wire.
  • I designates the wire to be spun or bent.
  • the wire is moved between the feed rolls II through the wire guide designated III towards the tools IV, V and VI which perform spinning or bending of the wire about the mandrel designated VII.
  • the feed rolls II which are insulated from the support are connected over carbon brushes 1 to one pole 2 of the controllable source of current generally designated 3.
  • the source of current is a rectifier.
  • the second pole 4 of the source of current 3, which pole is connected to the support, is thus connected to the tool V so that the circuit is closed when the spring wire engages said tool, whereby current will flow through the wire and heat it.
  • the wire 1 is thus heated from room temperature to the desired tempering temperature when it reaches the tool V and is bent about the mandrel.
  • the source of current or the rectifier 3 includes control means actuated by a control current.
  • the control current is produced by a so-called tachometer generator 5 the shaft of which is driven from the rolls II and is thus given a speed proportional to that of the rolls.
  • the current produced by the tachometer generator and increasing linearly with the increase of the speed of the rolls, is passed over a voltage divider 6 through a system of resistors 7, 8 producing control of the current curve, and through a number of diodes 9 optionally connectible by shunt.
  • the tachometer voltage is converted by said diodes into a control voltage which operates the control means of the source of current 3 so that the output voltage thereof, instead of being linear in relation to the rpm. of the rolls or the speed of wire like the voltage from the tachometer generator 5, becomes a logarithmic function of the r.p.m. of the rolls or the speed of the wire.
  • the current to output ratio is squared so that I XR N.
  • the means realizing this conversion of the curve of the control current are the diodes 9 at which the current curve squaredly rises with respect to the voltage applied to the diodes within certain given limit values.
  • the current curve can be controlled stepwise to a certain extent by parallel connection of one, two or three diodes.
  • the control current obtained in the above manner is caused to actuate the control means of the source of current 3 so that the output current of said source is varied in relation to the incoming control voltage.
  • the source of current has also associated with it a device 10 for adjusting the zero current, i.e., the current which during short standstill periods must be allowed to pass through the spring wire I in order that the temperature of the wire shall not sink appreciably for example during the short standstill that occurs when a spun or coiled spring is severed.
  • a further device (not shown) is connected in such a way that at temporary shutdown of the apparatus the so-called zero current is further reduced and is allowed to act as a heating current which prevents too large a temperature reduction of the wire guide III.
  • Use is made of this device also before the start of the apparatus for heating the wire guide which is provided for this purpose with a heating coil 11 at one end. In operation there is the risk that the wire guide III shall be heated too much, resulting in an uncontrollable heating of the Wire 1 before the current is allowed to pass therethrough.
  • a cooling device is arranged at the end of the wire guide adjacent the rolls II. As in the example illustrated, the cooling device preferably is a cold air nozzle VIII.
  • an oscilloscope terminal 12 is provided in the line leading from the tachometer generator 5, in which also a voltage meter 13 is arranged.
  • An oscilloscope terminal 14 is connected by shunt for measuring the low voltage in the line between the support and one pole 4 of the current source 3.
  • An operating cycle in the spring spinning or bending and tempering apparatus begins with the standstill of the wire I after a prior severing operation.
  • the wire is then accelerated to the maximum speed and is braked to standstill for an extremely short period, whereupon fine adjustment of the wire length is effected at lower speed.
  • the wire which in the meantime has been bent about the mandrel VII by means of the tools IV-VI and has been tempered when engaging the tool V, is finally stopped altogether and severed.
  • Apparatus for bending or coiling of springs from spring wire comprising:
  • control voltage means to control the intensity of the current causing the heating of the spring wire being bent or coiled in relation to the speed of advancement of the spring wire including a tachometer generator driven by said feed rolls,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Wire Processing (AREA)
US730165A 1967-05-17 1968-05-17 Apparatus for tempering springs in a spring spinning machine Expired - Lifetime US3552168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE06878/67A SE347762B (de) 1967-05-17 1967-05-17

Publications (1)

Publication Number Publication Date
US3552168A true US3552168A (en) 1971-01-05

Family

ID=20269820

Family Applications (1)

Application Number Title Priority Date Filing Date
US730165A Expired - Lifetime US3552168A (en) 1967-05-17 1968-05-17 Apparatus for tempering springs in a spring spinning machine

Country Status (6)

Country Link
US (1) US3552168A (de)
CH (1) CH472922A (de)
DE (1) DE1752367A1 (de)
FR (1) FR1564377A (de)
GB (1) GB1211585A (de)
SE (1) SE347762B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115685A (en) * 1976-07-01 1978-09-19 Mannesmann Aktiengesellschaft Resistive heating of elongated stock
WO2010070334A3 (en) * 2008-12-18 2010-09-10 Springform Technology Limited Improvements related to the manufacture of coil springs

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420981B (sv) * 1976-09-03 1981-11-16 Bulten Kanthal Ab Sett att varmboja ett vesentligen rakt trademne
KR101419698B1 (ko) * 2014-03-25 2014-07-21 대원강업 주식회사 열간 코일스프링 제조장치
US11524354B2 (en) 2017-06-09 2022-12-13 Illinois Tool Works Inc. Systems, methods, and apparatus to control weld current in a preheating system
MX2020002936A (es) * 2017-09-29 2020-07-24 Illinois Tool Works Sistemas metodos y aparatos para precalentar alambre de soldadura.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115685A (en) * 1976-07-01 1978-09-19 Mannesmann Aktiengesellschaft Resistive heating of elongated stock
WO2010070334A3 (en) * 2008-12-18 2010-09-10 Springform Technology Limited Improvements related to the manufacture of coil springs
US8800338B2 (en) 2008-12-18 2014-08-12 Springform Technology Limited Manufacture of coil springs

Also Published As

Publication number Publication date
DE1752367A1 (de) 1971-05-19
GB1211585A (en) 1970-11-11
SE347762B (de) 1972-08-14
FR1564377A (de) 1969-04-18
CH472922A (de) 1969-05-31

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