WO2025105386A1 - ばね部材の製造方法および制御装置 - Google Patents

ばね部材の製造方法および制御装置 Download PDF

Info

Publication number
WO2025105386A1
WO2025105386A1 PCT/JP2024/040276 JP2024040276W WO2025105386A1 WO 2025105386 A1 WO2025105386 A1 WO 2025105386A1 JP 2024040276 W JP2024040276 W JP 2024040276W WO 2025105386 A1 WO2025105386 A1 WO 2025105386A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
formed material
ratio
gripping member
carrying
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/JP2024/040276
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
良信 美濃
治樹 高見
凱 稲葉
和也 竹田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
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.)
Filing date
Publication date
Application filed by NHK Spring Co Ltd filed Critical NHK Spring Co Ltd
Priority to JP2025557874A priority Critical patent/JPWO2025105386A1/ja
Publication of WO2025105386A1 publication Critical patent/WO2025105386A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs

Definitions

  • the present invention relates to a method for manufacturing and controlling a spring member.
  • hot forming and cold forming are used in the process of manufacturing coil springs.
  • hot forming allows for the forming of thick wire, but the degree of freedom in the shape to be formed is small.
  • cold forming allows for a high degree of freedom in the shape to be formed, but it is difficult to form thick wire.
  • a technique that allows for a high degree of freedom in the shape and allows for the forming of thick wire is known in which the wire is cold formed and then heat treated, such as quenching and tempering (see, for example, Patent Document 1).
  • heat treatment is performed by attaching electrodes to both ends of the coil-shaped product (workpiece) after cold forming and passing electricity through them.
  • the present invention has been made in consideration of the above, and aims to provide a method and control device for manufacturing spring members that can reduce the variation in quality of spring members.
  • a method for manufacturing a spring member according to the present invention is a method for manufacturing a spring member by processing a base material made of a wire rod, and includes a cold forming step of cold forming the base material to produce a formed material having a spiral shape, a quenching step of quenching the formed material, and a tempering step of tempering the formed material after quenching, in which, in heating in at least one of the quenching step and the tempering step, the formed material is heated by passing current through the first and second current-carrying members in a state in which both ends of the formed material are held by a first current-carrying member that holds one end of the formed material by a pair of holding members and a second current-carrying member that holds the other end of the formed material by a pair of holding members, and a current ratio R, which is a ratio of a current flowing through one of the holding members to a sum of currents flowing through the current-carry
  • the method is characterized in that current is applied by setting contact area ratio R2 to a value close to contact area ratio R1 , which is the ratio of the contact area of one of the gripping members with the formed material to the sum of the contact areas of the formed material and the gripping members in the current-carrying member.
  • the method for manufacturing a spring member according to the present invention is also characterized in that, in the above invention, cooling water is circulated inside the electrically conductive member.
  • a control device is a control device for controlling the manufacture of a spring member, the control device including a cold forming step of cold forming a base material made of a wire rod to produce a formed material having a spiral shape, a quenching step of quenching the formed material, and a tempering step of tempering the formed material after quenching, the control device controlling the manufacture of a spring member including a cold forming step of cold forming a base material made of a wire rod to produce a formed material having a spiral shape, a quenching step of quenching the formed material, and a tempering step of tempering the formed material after quenching, the control device controlling the manufacture of a spring member including a cold forming step of cold forming a base material made of a wire rod to produce a formed material having a spiral shape, the quenching step of quenching the formed material, and the tempering step of tempering the formed material after quenching, the control device controlling the manufacture of a spring member including a cold forming step of cold
  • the present invention has the effect of reducing the variation in quality of spring members.
  • FIG. 1 is a diagram showing the structure of a coil spring produced by a manufacturing method according to an embodiment of the present invention.
  • FIG. 2 is a diagram for explaining a method for manufacturing a coil spring according to an embodiment of the present invention.
  • FIG. 3 is a diagram for explaining electrical heating.
  • FIG. 4 is a view seen from the direction of the arrow A shown in FIG.
  • FIG. 5 is a diagram (part 1) for explaining the setting of the current ratio during electrical heating.
  • FIG. 6 is a diagram (part 2) for explaining the setting of the current ratio during electrical heating.
  • FIG. 7 is a diagram (part 3) for explaining the setting of the current ratio during resistive heating.
  • FIG. 8 is a diagram for explaining electrical heating according to the first modification.
  • FIG. 9 is a diagram for explaining electrical heating according to the second modification.
  • FIG. 10 is a diagram for explaining electrical heating according to the third modification.
  • FIG. 11 is a cross-sectional view taken along line AA shown in FIG.
  • FIG. 12 is
  • (Embodiment) 1 is a diagram showing the configuration of a coil spring manufactured by a manufacturing method according to an embodiment of the present invention.
  • the coil spring 1 is manufactured by spirally winding a wire material.
  • the coil spring 1 is manufactured using, for example, a wire material made of a metal or an alloy.
  • Fig. 2 is a diagram for explaining a method for manufacturing a coil spring according to one embodiment of the present invention.
  • the coil spring 1 is produced by processing a base material.
  • a wire material 100 (see FIG. 2(a)) is drawn to obtain a drawn wire material 101 (see FIG. 2(b)).
  • the wire material 100 (drawn wire material 101) is not subjected to heat treatment, and a wire drawing machine is used to reduce the diameter of the wire material, for example by passing it through a die, to obtain a wire material (drawn wire material 101) with a designed diameter.
  • the drawn wire material 101 is shaped by cold forming (see FIG. 2(c)). Specifically, the drawn wire material 101 is wound using a winding machine 200.
  • This winding machine 200 includes, for example, a winding pin and a cutting tool, and shapes the drawn wire material 101 by contacting it with the winding pin, and cuts the drawn wire material 101 to a predetermined length using the cutting tool.
  • the formed material 102 obtained by winding and cutting the drawn wire 101 is subjected to electrical heating (see FIG. 2(d)).
  • electrical heating a first current-carrying member 211 is attached to one end of the formed material 102, and a second current-carrying member 212 is attached to the other end, and an electric current is passed through the first current-carrying member 211 and the second current-carrying member 212 to pass the electric current through the formed material 102. Heat is generated by this current flow, and the formed material 102 is heated.
  • the first current-carrying member 211 and the second current-carrying member 212 are made of a conductive material, and the movement of the members (the gripping of the molding material 102) and the current flow therethrough are controlled under the control of the control device 210.
  • the formed material 102 is quenched (see FIG. 2(e)).
  • the formed material 102 is immersed in a tank 221 containing a water-soluble quenching agent 222. At this time, the temperature and concentration of the water-soluble quenching agent are controlled so as to obtain an appropriate heat treatment quality.
  • a quenched formed material 103 is obtained. Note that water or oil may be used instead of the water-soluble quenching agent 222.
  • the formed material 103 is subjected to electrical heating for tempering (electrical tempering) (see FIG. 2(f)).
  • electrical tempering a first electrical member 231 is attached to one end of the formed material 103, and a second electrical member 232 is attached to the other end, and an electric current is passed through the first electrical member 231 and the second electrical member 232 to pass an electric current through the formed material 103. This electrical current generates heat, and the formed material 103 is heated.
  • electrical tempering electrical current conditions are set for reheating the formed material 103 to a predetermined hardness.
  • the first current-carrying member 231 and the second current-carrying member 232 are controlled by the control device 230 in terms of movement of the members (gripping of the formed material 103) and electrical conduction.
  • the electrical heating control explained here can be used in at least one of the following cases: when electrical heating is performed on the formed material 102 before quenching (see Fig. 2(d)), and when electrical heating is performed on the formed material 103 during tempering (see Fig. 2(f)).
  • the control adopted during tempering see Fig. 2(f) will be explained as an example.
  • FIG. 3 is a diagram for explaining electrical heating.
  • FIG. 4 is a diagram seen from the direction of the arrow A shown in FIG. 3.
  • the first electrical member 231 has a first gripping member 231a and a second gripping member 231b, and is located on one end side of the molding material 103.
  • the first gripping member 231a is prismatic and is located on the outer periphery of the molding material 103.
  • the first gripping member 231a has a flat portion 2311, the surface of which that comes into contact with the molding material 103 is flat.
  • the first gripping member 231a may be cylindrical or have another polygonal shape.
  • the surface of the first gripping member 231a that comes into contact with the molding material 103 may be curved.
  • the second gripping member 231b is cylindrical and is located on the inner periphery of the formed material 103.
  • the radius of curvature of the side (outer periphery) of the second gripping member 231b smaller than the radius of curvature of the inner periphery of the applicable formed material 103, it can be applied to various types of formed material 103.
  • the radius of curvature of the inner periphery of the formed material 103 corresponds to the radius of curvature of the inner periphery of the formed material 103 in a plan view (see FIG. 4) seen from the axial direction of the formed material 103 (the axial direction of winding). Note that as long as the surface of the second gripping member 231b that contacts the formed material 103 is curved, other parts may be polygonal.
  • the first gripping member 231a and the second gripping member 231b are supplied with electricity through a power transmission line (not shown) under the control of the control device 230.
  • the first gripping member 231a can be moved toward or away from the second gripping member 231b under the control of the control device 230.
  • the second gripping member 231b can be moved toward or away from the first gripping member 231a under the control of the control device 230.
  • the second gripping member 231b may be configured to be movable toward the first gripping member 231a in order to correspond to the diameter of the turns of the formed material 103, and the first current-carrying member 231 and the second current-carrying member 232 may be configured to be movable toward or away from each other in order to correspond to the number of turns of the formed material 103, etc.
  • the second current-carrying member 232 has a first gripping member 232 a and a second gripping member 232 b , and is located on the other end side of the molded material 103 .
  • the first gripping member 232a has a rectangular column shape, and is located on the outer periphery of the molded material 103.
  • the first gripping member 232a has a flat portion 2321, the surface of which that comes into contact with the molded material 103 is flat.
  • the second gripping member 232 b is cylindrical and is located on the inner periphery side of the molding material 103 .
  • the first gripping member 232 a and the second gripping member 232 b of the second current-carrying member 232 can have the same configuration as the first gripping member 231 a and the second gripping member 231 b of the first current-carrying member 231 .
  • the first current-carrying member 231 and the second current-carrying member 232 are controlled by the control device 230 through a power transmission line (not shown).
  • the first gripping member 232a and the second gripping member 232b are movable under the control of the control device 230.
  • the control device 230 places the formed material 103 at a predetermined position and grips one end and the other end of the formed material 103 by moving the gripping members of the first current-carrying member 231 and the second current-carrying member 232.
  • the control device 230 then passes a current through the first current-carrying member 231 and the second current-carrying member 232 via the power transmission line.
  • a current flows between the first current-carrying member 231 and the second current-carrying member 232 and the formed material 103 through the contact points. The heat generated at this time heats the formed material 103.
  • Figs. 5 to 7 are diagrams for explaining the setting of the current ratio during electrical heating, in which the first electrical member 231 and the second electrical member 232 have different contact area ratios.
  • the current ratio is calculated by integrating the resistance values on the current transmission path.
  • the current ratio here is the ratio of the current flowing through one current-carrying member (here, the second gripping member 232b) to the sum of the currents flowing through the first gripping member 232a and the second gripping member 232b.
  • the current ratio is the ratio (current side/total input) of the current flowing through the gripping member on the inner diameter side (current side) to the sum of the currents flowing through the current-carrying members (total input).
  • the second gripping member 232b it is (current flowing through the second gripping member 232b)/(sum of the currents flowing through the second current-carrying member 232).
  • the contact area ratio is the ratio of the contact area of the gripping member to the molding material, calculated based on the shape of the gripping member and the shape of the molding material, and is the ratio of the contact area of one gripping member (here, the second gripping member 232b) to the sum of the contact area of the one gripping member to the molding material 103 and the contact area of the other gripping member (here, the first gripping member 232a).
  • the contact area ratio and the current ratio are similarly uniform in the second gripping member 231b of the first current-carrying member. In this case, "uniform" includes errors in the material and manufacturing.
  • FIG. 5 shows the case where the contact area ratio is 0.35, and shows the relationship of the temperature of the first contact portion and the second contact portion to the current ratio, and the relationship of the current ratio and temperature on the outer diameter side/inner diameter side of the 0.2th turn of the molded material 103.
  • the first contact portion refers to the portion of the molded material 103 where the first gripping member 232a contacts
  • the second contact portion refers to the portion of the molded material 103 where the second gripping member 232b contacts.
  • the contact positions of each contact portion with the molded material 103 were set to the 0.08th turn.
  • the curve L 1 is a curve showing the relationship between the current ratio and the temperature of the first contact portion, and is an approximation curve for the measurement points (plot: ⁇ ) of the temperature at each current ratio.
  • the curve L 2 is a curve showing the relationship between the current ratio and the temperature of the second contact portion, and is an approximation curve for the measurement points (plot: ⁇ ) of the temperature at each current ratio.
  • curve L3 is a curve showing the relationship between the current ratio and temperature on the outer diameter side of the 0.2 turn of the formed material 103, and is an approximation curve for the measurement points (plot: ⁇ ) of the temperature versus the current ratio.
  • Curve L4 is a curve showing the relationship between the current ratio and temperature on the inner diameter side of the 0.2 turn of the formed material 103, and is an approximation curve for the measurement points (plot: ⁇ ) of the temperature versus the current ratio.
  • the temperatures of the first and second contact parts become the same when the current ratio is approximately the same as the contact area ratio of 0.35.
  • the temperatures of the first and second contact parts can be made uniform when the first gripping member 232a and the second gripping member 232b grip the parts and electrically heat them.
  • Fig. 6 shows the relationship between the temperature of the first contact and the second contact when the contact area ratio is 0.5.
  • curve L11 shows the relationship between the current ratio and the temperature of the first contact, and is an approximation curve for the measurement points (plot: square) of the temperature of the first contact at each current ratio.
  • Curve L12 shows the relationship between the current ratio and the temperature of the second contact, and is an approximation curve for the measurement points (plot: circle) of the temperature of the second contact at each current ratio.
  • Fig. 7 shows the relationship between the temperature of the first contact and the second contact when the contact area ratio is 0.6.
  • curve L21 shows the relationship between the current ratio and the temperature of the first contact, and is an approximation curve for the measurement points (plot: square) of the temperature of the first contact at each current ratio.
  • Curve L22 shows the relationship between the current ratio and the temperature of the second contact, and is an approximation curve for the measurement points (plot: circle) of the temperature of the second contact at each current ratio.
  • the current ratio may be close to or equal to the contact area ratio.
  • the temperature of the first contact portion and the second contact portion of the molding material 103 can be made uniform by setting the current ratio to a value within a range RA of the contact area ratio ⁇ 0.1, including the same, to the contact area ratio.
  • the current ratio R2 which is the ratio of the current flowing through the gripping member to the sum of the currents flowing through the current-carrying members, can be set within the range of R1 ⁇ 0.1.
  • the coil spring 1 shown in FIG. 1 is produced.
  • annealing may be performed before or after the wire drawing process.
  • the wire diameter is as designed in the base material state, it is possible to perform cold forming on the base material 100 without performing the wire drawing process.
  • the shape precision of the coil spring can be improved by quenching/tempering through uniform heating, and the improved shape precision can improve yields, thereby reducing variation in the quality of the coil springs.
  • the use of electrical heating for quenching/tempering makes it possible to reduce CO2 emissions.
  • Fig. 8 is a diagram for explaining electrical heating according to the first modified example.
  • the configuration of the current-carrying member that performs electrical heating is different from that of the current-carrying member according to the embodiment.
  • the configuration of the current-carrying member is the same as in the embodiment, and therefore the description will be omitted.
  • the same components as in the embodiment are denoted by the same reference numerals.
  • the movement of the members (grasping of the molding material 103) and the flow of electricity are controlled under the control of the control device 230, as in the embodiment.
  • the first current-carrying member 231A has a first gripping member 231c and a second gripping member 231b, and is located on one end side of the molding material 103.
  • the first gripping member 231c has a rectangular column shape and is located on the outer periphery of the molded material 103.
  • the first gripping member 231c has a curved surface 2312 in which a part of the surface that comes into contact with the molded material 103 is curved concavely. It is preferable that the radius of curvature of the wall surface that forms this curved surface 2312 is larger than the wire diameter of the molded material 103.
  • first gripping member 231c is movable under the control of the control device 230 in a direction toward or away from the second gripping member 231b.
  • the second current-carrying member 232A has a first gripping member 232c and a second gripping member 232b, and is located on the other end side of the molded material 103.
  • the first gripping member 232c has a rectangular column shape and is located on the outer periphery of the formed material 103.
  • the first gripping member 232c has a curved surface 2322 in which a part of the surface on the side that comes into contact with the formed material 103 is curved concavely. It is preferable that the radius of curvature of the wall surface that forms this curved surface 2322 is larger than the wire diameter of the formed material 103. Further, the first gripping member 232c is movable under the control of the control device 230 in a direction toward or away from the second gripping member 232b.
  • the first current-carrying member 231A and the second current-carrying member 232A are controlled by the control device 230 via a power transmission line (not shown). At this time, as in the embodiment, the contact area ratio and the current ratio are controlled to be the same.
  • the control device 230 places the formed material 103 at a predetermined position and grips one end and the other end of the formed material 103 by moving the gripping members of the first current-carrying member 231A and the second current-carrying member 232A.
  • the control device 230 then passes a current through the first current-carrying member 231A and the second current-carrying member 232A via the power transmission line.
  • a current flows through the contact points between the first current-carrying member 231A and the second current-carrying member 232A and the formed material 103.
  • the heat generated at this time heats the formed material 103.
  • the contact area ratio of the gripping member that grips the formed material to the formed material is the same as the current ratio of the current passed through the gripping member, so that the entire formed material can be heated to a uniform temperature. According to the first modification, it is possible to reduce the variation in the quality of the coil spring.
  • the first gripping members 231c, 232c are each formed with a concave curved surface 2312, 2322 on the surface that comes into contact with the molding material 103, and the molding material 103 is gripped by each curved surface, so that the molding material 103 can be gripped more reliably.
  • Fig. 9 is a diagram for explaining electrical heating according to the second modified example.
  • the configuration of the current-carrying member that performs electrical heating is different from that of the current-carrying member according to the embodiment. Since the second modified example is the same as the embodiment except for the configuration of the current-carrying member, the description will be omitted.
  • the same components as those in the embodiment are denoted by the same reference numerals.
  • the movement of the members (grasping of the molding material 103) and the flow of electricity are controlled under the control of the control device 230, as in the embodiment.
  • the first current-carrying member 231B has a first gripping member 231d and a second gripping member 231b, and is located on one end side of the molding material 103.
  • the first gripping member 231d has a rectangular column shape and is located on the outer periphery of the molded material 103.
  • the first gripping member 231d has a groove portion 2313 in which a part of the surface that contacts the molded material 103 is a V-shaped groove. The formation area (formation width and depth) of this groove portion 2313 is set so that the first gripping member 231d and the second gripping member 231b do not contact each other.
  • first gripping member 231d may have other parts that are cylindrical or have other polygonal shapes as long as the surface that contacts the molded material 103 has the above-mentioned shape. Further, the first gripping member 231d is movable under the control of the control device 230 in a direction toward or away from the second gripping member 231b.
  • the second current-carrying member 232B has a first gripping member 232d and a second gripping member 232b, and is located on the other end side of the molded material 103.
  • the first gripping member 232d has a rectangular column shape and is located on the outer periphery of the formed material 103.
  • the first gripping member 232d has a groove portion 2323 in which a part of the surface on the side that comes into contact with the formed material 103 is a V-shaped groove. It is preferable that the formation area (formation width) of the groove portion 2323 is larger than the wire diameter of the formed material 103. Further, the first gripping member 232d is movable under the control of the control device 230 in a direction toward or away from the second gripping member 232b.
  • the first current-carrying member 231B and the second current-carrying member 232B are controlled by the control device 230 via a power transmission line (not shown). At this time, as in the embodiment, the contact area ratio and the current ratio are controlled to be the same.
  • the contact area ratio is the sum of the area ratios of the multiple points where the gripping member and the molding material come into contact.
  • the control device 230 is placed on the formed material 103 at a predetermined position, for example, and grips one end and the other end of the formed material 103 by moving the gripping members of the first current-carrying member 231B and the second current-carrying member 232B.
  • the control device 230 then passes a current through the first current-carrying member 231B and the second current-carrying member 232B via the power transmission line.
  • a current flows through the contact points between the first current-carrying member 231B and the second current-carrying member 232B and the formed material 103.
  • the heat generated at this time heats the formed material 103.
  • grooves 2313, 2323 are formed on the surfaces of the first gripping members 231d, 232d that come into contact with the molded material 103, respectively, so that the molded material 103 is gripped on each curved surface, allowing the molded material 103 to be gripped more reliably.
  • Fig. 10 is a diagram for explaining the electric heating according to the third modified example.
  • Fig. 11 is a cross-sectional view taken along line A-A in Fig. 10.
  • Fig. 10 corresponds to a view seen from the direction of arrow A in Fig. 3.
  • Fig. 11 is a cross-sectional view taken along a plane parallel to the axis of winding of the formed material 103.
  • the configuration of the electric current member that performs the electric heating is different from that of the electric current member according to the embodiment.
  • the configuration of the electric current member is the same as that of the embodiment, and therefore a description thereof will be omitted.
  • the movement of the member (grasping of the molding material 103) and the current flow are controlled under the control of the control device 230, as in the embodiment. Note that a similar configuration can also be adopted for the second current-carrying member.
  • the first current-carrying member 231C has a first gripping member having a first member 231e and a second member 231f, and a second gripping member 231g, and is located on one end side of the molded material 103.
  • the first member 231e and the second member 231f are each prismatic, arranged side by side along the axial direction of the winding of the formed material 103, and contact the same turn position of the formed material 103.
  • the first current-carrying member 231C according to the present modified example 3 has a plurality of contact points (two in this case) on the outer circumferential side with respect to the same turn of the formed material.
  • the contact points are not limited to the same turn, and may be provided at positions slightly apart.
  • the first gripping member is movable under the control of the control device 230 in a direction toward or away from the second gripping member 231g.
  • the second gripping member 231g is cylindrical and located on the inner periphery of the molding material 103.
  • the second gripping member 231g may also be polygonal.
  • the first current-carrying member 231C is controlled by the control device 230 via a power transmission line (not shown). At this time, as in the embodiment, the contact area and the current ratio are controlled to be the same.
  • the contact area is the sum of the areas of the contact points between the first member 231e and the molding material 103 and between the second member 231f and the molding material 103.
  • the control device 230 is placed on the formed material 103 at a predetermined position, for example, and grips one end and the other end of the formed material 103 by moving the gripping members of the first current-carrying member 231C and the second current-carrying member. The control device 230 then passes a current through the first current-carrying member 231C and the second current-carrying member via the power transmission line. A current flows between the first current-carrying member 231C and the second current-carrying member and the formed material 103 through the contact points. The heat generated at this time heats the formed material 103.
  • the third modified example described above as in the embodiment, electrical heating is performed so that the contact area ratio of the gripping member that grips the formed material to the formed material is the same as the current ratio of the current passed through the gripping member, so that the entire formed material can be heated to a uniform temperature. According to the third modified example, it is possible to reduce the variation in the quality of the coil spring.
  • Fig. 12 is a diagram for explaining electrical heating according to the fourth modified example.
  • a water-cooling structure is provided inside the current-carrying member according to the embodiment.
  • the structure is the same as in the embodiment except for the current-carrying member, and therefore description thereof will be omitted.
  • the same components as in the embodiment are denoted by the same reference numerals.
  • the movement of the member (grasping of the molding material 103) and the current flow are controlled under the control of the control device 230, as in the embodiment. Note that a similar configuration can also be adopted for the second current-carrying member.
  • the first current-carrying member according to the fourth modified example has a first gripping member 231 h and a second gripping member 231 i , and is located on one end side of the molded material 103 .
  • the first gripping member 231h has a hollow rectangular column shape and is located on the outer periphery of the molding material 103.
  • a bottomed hollow space 2340 is formed in the first gripping member 231h.
  • a pipe 2341 is provided in this hollow space 2340.
  • cooling water for cooling the first gripping member 231h is caused to flow from the outside into the pipe 2341, and the cooling water discharged outside the pipe 2341 passes through the hollow space 2340 outside the pipe 2341 and is sent to the outside of the first gripping member 231h.
  • the first gripping member 231h can be moved under the control of the control device 230 in a direction toward or away from the second gripping member 231i.
  • the second gripping member 231i has a hollow rectangular column shape and is located on the outer periphery of the molding material 103.
  • a bottomed hollow space 2350 is formed in the second gripping member 231i.
  • a pipe 2351 is provided in this hollow space 2350.
  • cooling water for cooling the second gripping member 231i is flowed from the outside into the pipe 2351, and the cooling water discharged outside the pipe 2351 passes through the hollow space 2350 outside the pipe 2351 and is sent outside the second gripping member 231i.
  • the first current-carrying member in this fourth modification has current controlled via a power transmission line (not shown) under the control of the control device 230. At this time, as in the embodiment, the contact area and the current ratio are controlled to be the same.
  • the control device 230 places the formed material 103 at a predetermined position and grips one end and the other end of the formed material 103 by moving the gripping members of the first and second current-carrying members.
  • the control device 230 then passes a current through the first and second current-carrying members via the power transmission line.
  • a current flows between the first and second current-carrying members and the formed material 103 through the contact points. The heat generated at this time heats the formed material 103.
  • cooling water is circulated inside the first gripping member 231h and the second gripping member 232i, so that the temperature to which the molding material 103 is heated can be adjusted and damage to the gripping members due to heat can be suppressed.
  • the present invention should not be limited to only the above-mentioned embodiment.
  • the configurations of the current-carrying members according to the embodiment and modified example may be appropriately combined.
  • the present invention can include various embodiments not described here, and various design changes can be made without departing from the technical concept defined by the claims.
  • the above embodiment describes heating in the manufacture of coil springs
  • the present invention can also be used for heating in the manufacture of other spring components such as stabilizers, for example.
  • the spring member manufacturing method and control device of the present invention are suitable for suppressing variation in the quality of spring members.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
PCT/JP2024/040276 2023-11-17 2024-11-13 ばね部材の製造方法および制御装置 Pending WO2025105386A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025557874A JPWO2025105386A1 (https=) 2023-11-17 2024-11-13

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023195978 2023-11-17
JP2023-195978 2023-11-17

Publications (1)

Publication Number Publication Date
WO2025105386A1 true WO2025105386A1 (ja) 2025-05-22

Family

ID=95743112

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/040276 Pending WO2025105386A1 (ja) 2023-11-17 2024-11-13 ばね部材の製造方法および制御装置

Country Status (2)

Country Link
JP (1) JPWO2025105386A1 (https=)
WO (1) WO2025105386A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210940A (en) * 1975-07-15 1977-01-27 Kurimoto Iron Works Ltd Electric heating device
JPS5711741A (en) * 1980-06-27 1982-01-21 High Frequency Heattreat Co Ltd Production of coil spring
US20110031666A1 (en) * 2009-08-07 2011-02-10 Warner Jerry G Heat Treatment of Helical Springs or Similarly Shaped Articles by Electric Resistance Heating
JP2011195919A (ja) * 2010-03-23 2011-10-06 Chuo Spring Co Ltd ばねの通電加熱方法及びその装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210940A (en) * 1975-07-15 1977-01-27 Kurimoto Iron Works Ltd Electric heating device
JPS5711741A (en) * 1980-06-27 1982-01-21 High Frequency Heattreat Co Ltd Production of coil spring
US20110031666A1 (en) * 2009-08-07 2011-02-10 Warner Jerry G Heat Treatment of Helical Springs or Similarly Shaped Articles by Electric Resistance Heating
JP2011195919A (ja) * 2010-03-23 2011-10-06 Chuo Spring Co Ltd ばねの通電加熱方法及びその装置

Also Published As

Publication number Publication date
JPWO2025105386A1 (https=) 2025-05-22

Similar Documents

Publication Publication Date Title
JP5865246B2 (ja) ばねの製造方法及び通電加熱装置
US11044788B2 (en) Heat treatment of helical springs or similarly shaped articles by electric resistance heating
US20130092675A1 (en) Method and apparatus for electrically heating spring
WO2014034375A1 (ja) スタビライザの製造方法および加熱装置
WO2025105386A1 (ja) ばね部材の製造方法および制御装置
US4215259A (en) Surface hardening of metals using electric currents
WO2020026716A1 (ja) コイルばねの加熱方法、座巻部加熱装置、およびコイルばね
WO2024075314A1 (ja) コイルばねの製造方法
US12053816B2 (en) Apparatus and method for manufacturing rack bar
JP2024054699A (ja) コイルばねの製造方法
JP2024054700A (ja) コイルばねの製造方法
JP2014173148A (ja) 薄肉立体形状体の製造方法
JP2017218654A (ja) カムシャフトの高周波焼入れ方法
JPS62280325A (ja) 長い導電性工作片を周辺誘導電流によつて熱処理する方法及びその為の装置
JP2660408B2 (ja) 軸付き筒体の高周波焼戻し方法
JPH04255690A (ja) 高周波誘導加熱コイル
US4175228A (en) Method of hot bending a generally straight wire blank
JPS6359775B2 (https=)
US20250320902A1 (en) Coil spring and manufacturing method of the same
JP2004043919A (ja) 肉厚に変動がある円筒部材及びシリンダブロックの誘導加熱焼戻装置
US7011720B2 (en) Double-taper steel wire and continuous heat treating method and device therefor
JP7746605B2 (ja) 交流通電加熱方法および交流通電加熱装置
WO2024204183A1 (ja) コイルばねの製造方法
JP2024054698A (ja) コイルばねの製造方法
JP2023097560A (ja) 高周波加熱コイルおよびコイルばね成形装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24891422

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2025557874

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025557874

Country of ref document: JP