JP6134523B2 - Spring manufacturing method - Google Patents

Description

  The present invention relates to a spiral spring manufacturing method, a spring manufacturing mold, a mold manufacturing method, a spring manufacturing apparatus, and a spring used for a balance of a watch.

  As a method of brazing a linear elastic body to a spiral spring, conventionally, a wire rod made of a plurality of elastic bodies is attached to a winding rod, the winding rod is rotated to wind the wire rod, and this is heat treated to form a spiral shape. A method of manufacturing a spring for brazing is known. This type of spring is used as a hairspring in watch balances. As a material for the hairspring, for example, a ribbon material is used.

  FIG. 12 is a view for explaining a method of brazing the wire 102 to the hairspring 104. Fig.12 (a) is a plane schematic diagram showing the state which attached the four wire to the winding rod. FIG. 12B is a schematic plan view showing a state in which the wound wire is stored in the rolled barrel 103. FIG. 12C is a schematic plan view of the hairspring 104 disassembled after the heat treatment.

  First, as shown in FIG. 12A, four wire rods 102 are attached to the winding rod 101. The entrainment rod 101 is installed at the center of the entrainment barrel 103. Next, as shown in FIG. 12B, the winding rod 101 is rotated to simultaneously wind the four wires 102 and set in the winding barrel 103. Next, the entrainment barrel 103 including the four wires 102 is heat-treated, and each wire 102 is braided in a spiral shape. Next, as shown in FIG.12 (c), each wire 102 is removed from the winding rod 101, and it isolate | separates separately. Accordingly, a plurality of hairsprings 104 that are brazed in a spiral shape can be formed simultaneously.

  FIG. 13 is a schematic plan view of the hairspring formed as described above. The hairspring 104 used for the balance of the watch is attached to the Archimedes curve. As shown in FIG. 13, the Archimedean curve has the same spiral pitch P. By making the hairspring 104 an Archimedean curve, the reciprocating rotational vibration of the balance wheel constituting the balance of the timepiece is kept constant so that the timepiece keeps a constant rate.

  FIG. 14 shows a state in which a beard 105 is installed at the outer peripheral end of the hairspring 104 and a whistle ball 107 is installed at the inner peripheral end. Beard 105 is connected to the balance of the balance of the watch, and whisker 107 is connected to the balance of the balance of the watch. Since the diameter of the whiskers 105 is larger than the pitch P of the Archimedes curve, the outer end brazing is performed so that the outer peripheral area 106 of the hairspring 104 extends outward from the pitch P. This prevents the whiskers 105 from contacting the inner peripheral wire.

“The horological Institute of Japan”, published by the Watch Society of Japan, December 15, 1962, p. 38

  When the elastic wire is heat-treated and brazed to the hairspring 104 by the conventional method, it is difficult to braze into a spiral shape with a predetermined pitch. In addition, the spiral shape may change over time, and for example, the accuracy of the rate of the watch may be reduced. In addition, there may be a case where the hairsprings 104 adhere to each other and cannot be separated after the four are heat-treated and brazed at the same time. In addition, after the outer end brazing is performed, the wire rod in the outer peripheral region 106 is deformed to the inner peripheral side as time passes, and the beard 105 and the balance spring 104 come into contact with each other. Therefore, the rate accuracy of the watch may be reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a spiral spring in which the balance springs 104 are not attached to each other and deformation with time is small.

  The spring manufacturing method of the present invention includes a preparation step of preparing a mold having a spiral groove having a spiral curve on the surface, a spring material installation step of installing a spring material in the spiral groove, and heat-treating the spring material together with the mold. And a removal step of taking out the spiral spring from the mold.

  In addition, a coating step of applying a coating agent to the side surface and the bottom surface of the spiral groove is provided.

  Further, the heat treatment step is a step of performing heat treatment by installing a lid on the surface of the mold.

  Further, the spring material installation step is a step of installing the spring material made of a wire material in the spiral groove.

  In addition, an adhesive filling step of filling the spiral groove with an adhesive is provided.

  The heat treatment step is a step of brazing the spiral curve on the wire.

  The spiral curve is an Archimedean curve.

  Further, the mold has an inner end member receiving groove that is in the vicinity of the inner end of the spiral groove and is continuous with the spiral groove, and an inner end member installation step of installing the inner end member in the inner end member receiving groove is performed. The heat treatment step includes a step of bonding the spring material and the inner end member.

  Further, the mold has an outer end member receiving groove that is in the vicinity of the outer end of the spiral groove and is continuous with the spiral groove, and an outer end member installation step of installing the outer end member in the outer end member receiving groove is performed. The heat treatment step includes a step of bonding the spring material and the outer end member.

  Further, the mold has an outer peripheral groove at a position on the outer peripheral side with respect to the outermost peripheral groove of the spiral groove with respect to a pitch distance in the radial direction of the spiral curve, and one end of the outer peripheral groove is formed on the spiral groove. It was decided to continue to the outer end.

  Further, the mold has an outer end member receiving groove in the vicinity of the other end of the outer peripheral groove, and includes an outer end member installation step of installing an outer end member in the outer end member receiving groove, and the heat treatment step includes: The spring material and the outer end member are bonded.

  Further, the preparation step includes a step of preparing an external jig installed on the outer peripheral side of the spiral groove of the mold, the external jig being continuous with an outer end of the spiral groove, and the spiral groove An outer groove located on the outer peripheral side of the outermost groove of the spiral curve with respect to the radial pitch distance of the spiral curve, and the spring material installation step includes a step of installing the spring material in the external groove Included.

  The external jig includes an outer end member receiving groove in the outer groove, and includes an outer end member installation step of installing an outer end member in the outer end member receiving groove. A step of bonding the spring material and the outer end member is included.

  The mold of the present invention has a spiral groove having a spiral curve on the surface.

  The spiral curve is an Archimedean curve.

  Further, an inner end member receiving groove is provided near the inner end of the spiral groove and continuous to the inner end.

  In addition, an outer peripheral groove is provided at a position on the outer peripheral side with respect to the radial pitch distance of the spiral curve with respect to the outermost peripheral groove of the spiral groove, and one end of the outer peripheral groove is continuous with the outer end of the spiral groove. In addition, an outer end member receiving groove is provided in the vicinity of the other end of the outer peripheral end.

  The mold manufacturing method of the present invention includes a resin film installation step of installing a photosensitive resin film on the surface of a substrate, and a resin film pattern formation step of exposing and developing the photosensitive resin film to form a spiral film resin film pattern And a groove forming step of forming a spiral groove having a spiral curve by etching the surface of the substrate, and a resin film removing step of removing the photosensitive resin film.

  The spring manufacturing apparatus of the present invention includes a spring material mounting means for mounting a spring material along a spiral groove on a mold having a spiral groove on the surface, and a spring for heat-treating the mold on which the spring material is mounted. Material heat treatment means and spring material take-out means for taking out the spiral spring heat-treated from the mold are provided.

  The spring manufacturing method of the present invention includes a preparation step of preparing a mold having a spiral groove having a spiral curve on the surface, a spring material installation step of installing a spring material in the spiral groove, and a heat treatment in which the spring material is heat-treated together with the mold. A step, and a step of taking out the spiral spring from the mold. Thereby, a spiral spring with little deformation over time can be easily manufactured.

It is process drawing showing the manufacturing method of the spring which concerns on the basic composition of this invention. It is process drawing showing the manufacturing method of the spring which concerns on 1st embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 1st embodiment of this invention. It is process drawing showing the type | mold manufacturing method which forms a spiral groove in the surface of the type | mold of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 1st embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 1st embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 2nd embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 2nd embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 3rd embodiment of this invention. It is a figure for demonstrating the manufacturing method of the spring which concerns on 4th embodiment of this invention. It is a figure for demonstrating the manufacturing apparatus of the spring which concerns on 5th embodiment of this invention. It is a figure for demonstrating the method of brazing a conventionally well-known wire to a hairspring. It is a plane schematic diagram of a conventionally known hairspring. This represents a state in which a whiskers are installed at the outer peripheral end of a conventionally known hairspring and whiskers are installed at the inner peripheral end.

(Basic configuration)
FIG. 1 is a process diagram showing a spring manufacturing method according to the basic configuration of the present invention. The spring manufacturing method prepares a die having a spiral groove having a spiral curve on the surface in the preparation step S1. Next, in the spring material filling step S2, a linear spring material is installed in the spiral groove. Next, in the heat treatment step S3, the spring material is heat treated together with the mold. Next, in the extraction step S4, the spiral spring brazed from the mold is extracted. Thereby, the springs do not adhere to each other during the heat treatment, and a spiral spring with little deformation with time can be easily manufactured.

(First embodiment)
FIG. 2 is a process diagram illustrating the spring manufacturing method according to the first embodiment. 3-6 is a figure for demonstrating the manufacturing method of the spring which concerns on 1st embodiment of this invention. FIG. 3 is an explanatory view of the mold 1, FIG. 4 is a process diagram showing a mold manufacturing method for forming the spiral groove 2 on the surface of the mold 1, and FIG. 5 shows a state in which the spring material 3 is installed on the mold 1. FIG. 6 is a schematic plan view of the brazed spiral spring 12.

  As shown in FIG. 2, the spring manufacturing method according to the present embodiment includes a preparation step S1 for preparing a mold having a spiral groove, a coating step S5 for applying a coating agent to the spiral groove, and a spring material is installed in the spiral groove. A spring material installation step S2, an adhesive filling step S6 for installing the inner end member in the inner end member receiving groove, an adhesive filling step S7 for filling the spiral groove with an adhesive, and a heat treatment step S3 for heat treating the spring material. And a removal step S4 for taking out the spiral spring from the mold.

  3A is a schematic plan view of the mold 1, and FIG. 3B is a schematic cross-sectional view of the mold 1. First, in preparation process S1, the type | mold 1 which has the spiral groove 2 which consists of a spiral curve on the surface is prepared. The mold 1 has an inner end member receiving groove 5 that is in the vicinity of the inner end E <b> 1 of the spiral groove 2 and continues to the spiral groove 2. The spiral groove 2 can be an Archimedean curve having the same radial pitch P. By using an Archimedean curve, the rate accuracy can be improved when applied to the balance of a watch. The cross section of the spiral groove 2 in the radial direction is a rectangle that is long in the depth direction, and the spring material 3 that is wide in the direction perpendicular to the spiral surface can be stored.

  The material of the mold 1 can be selected according to the heat treatment temperature of the spiral spring. When the spiral spring is formed of a synthetic resin such as plastic, a mold material that can withstand the heat treatment temperature in the subsequent heat treatment step S3 is used. When the spiral spring is formed of a glass material, a metal, a steel material, or the like, a metal material, a steel material, a single crystal material, a polycrystalline material, or a ceramic material can be used as the mold 1.

  A mold manufacturing method for forming the spiral groove 2 on the surface of the mold 1 will be described with reference to FIG. An example in which a silicon wafer is used as the substrate will be described. First, in the resin film installation step S11, a photosensitive resin made of a resist or the like is applied or installed on the surface of the base material to form a photosensitive resin film. Next, in the resin film pattern forming step S12, the photosensitive resin film is exposed and developed to form a spiral-curved resin pattern. Moreover, the pattern for inner end member receiving grooves or the pattern for outer end member receiving grooves is formed as needed. Next, in the groove forming step S13, the surface of the base material is subjected to anisotropic etching by wet etching or dry etching, for example, ion etching to form the spiral groove 2 having a spiral curve. The cross section in the radial direction of the spiral groove 2 can be a long rectangle in the depth direction. In this case, the silicon wafer is etched. Next, in the resin film removing step S14, a chemical solution process or an ashing process is performed to remove the photosensitive resin film. Thereby, the spiral groove 2, the inner end member receiving groove 5, and the outer end member receiving groove which will be described later can be formed on the surface of the mold 1 as necessary. As the base material (mold material), a metal material or a glass material can be used instead of the silicon wafer. Moreover, a ceramic mold can be formed by forming a primary mold in which irregularities are reversed, transferring the surface shape of the primary mold to a powder or green sheet before sintering, and sintering the powder.

  Next, a coating agent can be applied to the side surface and the bottom surface of the spiral groove 2 in the coating step S5. By applying the coating agent, the spring material 3 can be smoothly inserted into the spiral groove 2. As the coating agent, Teflon (registered trademark) coating using Teflon (registered trademark) or parylene coating using parylene can be performed. Moreover, a mold release agent can be applied to the side surface and the bottom surface of the spiral groove 2. As a mold release agent, for example, carbon powder can be applied to the inner surface of the spiral groove 2.

  The inner end member receiving groove 5 is not an essential requirement in the present invention. After forming the spiral spring 12 by brazing the spring material 3 in a spiral shape, an inner end member may be attached to the inner peripheral end of the spiral spring 12. However, if the inner end member and the spring material 3 are bonded in the heat treatment step S3 in which the spring material 3 is brazed to the spiral spring 12, the bonding process is simplified.

  FIG. 5A is a schematic plan view of the mold 1 provided with the spring material 3, and FIG. 5B is a schematic cross-sectional view thereof. In the spring material installation step S <b> 2, the spring material 3 made of a wire material is installed in the spiral groove 2. If a coating agent is applied to the side surface and the bottom surface of the spiral groove 2, the spring material 3 can be smoothly installed in the spiral groove 2. Next, in the inner end member installation step S <b> 6, the inner end member 7 can be installed in the inner end member receiving groove 5. The inner end portion of the spring material 3 and the inner end member 7 are contacted or connected. As the inner end member 7, a material that is welded to the spring member 3 in the subsequent heat treatment step S3 can be used. Further, a brazing material having a melting point lower than that of the spring material 3 or the inner end member 7 can be installed at a contact portion between the inner end member 7 and the spring material 3 to form an adhesive.

  Next, in the adhesive filling step S7, the spiral groove 2 in which the spring material 3 is installed can be filled with the adhesive. By filling the adhesive, the spring material 3 can be fixed to the spiral groove 2, and the spring material 3 can be prevented from deviating from the spiral groove 2 during the heat treatment. Araldite or the like can be used as the adhesive. The adhesive is selected so as not to evaporate during the subsequent heat treatment and remain in the spiral groove 2.

  A lid can be installed on the upper surface of the mold 1. By installing the lid, even if the spring material 3 expands and moves during the heat treatment, the spring material 3 can be prevented from deviating from the spiral groove 2. Here, with a thin wire rod attached to the outer end of the spring member 3 and a lid placed on the mold 1, a thin wire rod is inserted from the inner end E1 side of the spiral groove 2, and the outer peripheral end side of the spiral groove 2 is inserted. Therefore, the spring material 3 can be introduced into the spiral groove 2 by pulling the wire. Conversely, the spring material 3 may be introduced from the outer end E2 side of the spiral groove 2.

  Next, in the heat treatment step S <b> 3, the spring material 3 is heat treated together with the mold 1. If a lid is installed, heat-treat with the lid. When a ribbon material is used as the spring material 3, the heat treatment temperature is set to a range of about 600 ° C to 1000 ° C. As a result, the spring material 3 is brazed with a spiral curve. Further, when the inner end member 7 is installed in the inner end member receiving groove 5, the spring material 3 and the inner end member 7 can be bonded. This adhesion may be one in which any material is melted and welded, or may be adhered through a brazing material or the like. In the spring manufacturing method according to the present invention, during the heat treatment step S3, the spring material 3 is installed in the spiral groove 2 so as to be expandable / contractable, so that the stress applied to the spring material 3 is obtained by applying a plurality of spring materials. It is smaller than when it is wound around a winding rod and brazed. Therefore, the residual stress after heat treatment is reduced, and the spiral shape after brazing is stabilized.

  Next, in the extraction step S <b> 4, the spiral spring 12 that is brazed from the mold 1 is extracted. A physical method such as applying ultrasonic vibration to the mold 1 or breaking the mold 1 can be used. Further, if a release agent is applied to the spiral groove 2 in the spring material installation step S2, the spring material 3 can be easily taken out. If the spiral groove 2 of the mold 1 is an Archimedean curve, spiral springs 12 having a pitch P equal to the radial direction can be formed as shown in FIG. When the spiral spring 12 is used as a hairspring for a watch, an outer end member (beard) is attached to the outer end portion of the spiral spring 12.

  Thus, by installing the spring material 3 in the spiral groove 2 formed on the surface of the mold 1 and performing brazing by heat treatment, the spiral springs 12 adhere to each other when the spiral spring 12 after heat treatment is taken out. There is no. Further, the spiral spring 12 having a highly accurate spiral curve can be formed. Furthermore, the residual stress of the spiral spring 12 is reduced and the spiral shape is stabilized for a long time. Therefore, it is suitable for manufacturing a timepiece spring for a watch. In addition, in the manufacturing method of the spring of this invention, each process of coating process S5, inner end member installation process S6, and adhesive filling process S7 is not indispensable requirements, Even if these processes are omitted, the effect of this invention is exhibited. be able to.

(Second embodiment)
FIG.7 and FIG.8 is a figure for demonstrating the manufacturing method of the spring which concerns on 2nd embodiment of this invention. FIG. 7 is an explanatory view of the mold 1, and FIG. 8 is an explanatory view of a state where the spring material 3 is installed on the mold 1. The difference from the first embodiment is that an outer end member receiving groove 4 is formed in the vicinity of the outer end E2 of the spiral groove 2 formed in the mold 1, and the outer end member 6 is installed in the outer end member receiving groove 4. It is. Other basic configurations are the same as those in the first embodiment. The same portions or portions having the same function are denoted by the same reference numerals.

  The spring manufacturing method in the present embodiment includes a preparation step S1 for preparing a mold having a spiral groove, a spring material installation step S2 for installing a spring material in the spiral groove, and an inner end member in the inner end member receiving groove. Adhesive filling step S6, outer end member installation step S8 for installing the outer end member in the outer end member receiving groove, heat treatment step S3 for heat treating the spring material, and removal step S4 for taking out the spiral spring from the mold. .

  FIG. 7A is a schematic top view of the mold 1, and FIG. 7B is a schematic cross-sectional view of the mold 1. First, in the preparation step S1, the spiral groove 2 having a spiral curve on the surface, the outer end member receiving groove 4 adjacent to the outer end E2 of the spiral groove 2 and continuing to the spiral groove 2, and the inner end E1 of the spiral groove 2 And a die 1 having an inner end member receiving groove 5 continuous with the spiral groove 2 is prepared. Since the material of the mold 1 and the method of forming the spiral groove 2, the inner end member receiving groove 5 and the outer end member receiving groove 4 on the surface of the mold 1 are the same as those in the first embodiment, description thereof is omitted.

  Next, a spring material 3 made of a wire is installed in the spiral groove 2 in the spring material installation step S2. FIG. 8A is a schematic plan view of the mold 1 on which the spring material 3 is installed, and FIG. 8B is a schematic cross-sectional view thereof. Next, the inner end member 7 is installed in the inner end member receiving groove 5 in the inner end member installation step S6. Further, in the outer end member installation step S8, the outer end member 6 is installed in the outer end member receiving groove 4. The inner end portion of the spring material 3 and the inner end member 7 are contacted or connected, and the outer end portion of the spring material 3 and the outer end member 6 are contacted or connected. A brazing material having a low melting point can be installed at a contact portion between the inner end member 7 and the spring material 3 and a contact portion between the outer end member 6 and the spring material 3 to obtain an adhesive. The other heat treatment step S3 and the removal step S4 are the same as those in the first embodiment, and thus the description thereof is omitted.

  By brazing the spring material 3 in this way, the spiral springs 12 do not adhere to each other when the spiral spring 12 is removed after the heat treatment. Further, the spiral spring 12 having a highly accurate spiral curve can be formed. Furthermore, the residual stress of the spiral spring 12 is reduced and the spiral shape is stabilized for a long time. Further, since the inner end member 7 is bonded to the inner end portion of the spring material 3 and the outer end member 6 is bonded to the outer end portion of the spring material 3 in the heat treatment step S3, the manufacturing process can be simplified.

  In the second embodiment, the outer end member receiving groove 4 and the inner end member receiving groove 5 are provided with the outer end member 6 and the inner end member 7 separately from the spring material 3. Instead, the inner end member 7 and the outer end member 6 are connected in advance to the inner end portion of the spring material 3 and the outer end portion, respectively, and the spring material 3 is attached to the spiral groove 2 from the inner end side. Also good.

(Third embodiment)
FIG. 9 is a diagram for explaining a spring manufacturing method according to the third embodiment of the present invention. 9A is a schematic plan view of the mold 1 and the external jig 8, and FIG. 9B is a schematic cross-sectional view of the part AA of the mold 1 and the external jig 8. FIG. c) is a schematic plan view of a state in which the spring material 3 is installed on the mold 1 and the external jig 8. The difference from the first embodiment is that a scooping portion 10 is formed at the outer end of the spiral groove 2 of the mold 1, and an external jig 8 is attached to the scooping portion 10 to braze the outer peripheral region of the spring material 3. It is a point to do. The same portions or portions having the same function are denoted by the same reference numerals.

  In the present embodiment, the spring manufacturing method includes a preparation step S1 for preparing the mold 1 having the spiral groove 2, a spring material installation step S2 for installing the spring material 3 in the spiral groove 2, and an inner end member receiving groove 5 in the inner end member receiving groove 5. The adhesive filling step S6 for installing the end member 7, the outer end member installing step S8 for installing the outer end member 6 in the outer end member receiving groove 4, the heat treatment step S3 for heat treating the spring material 3, and the spiral from the mold 1 An extraction step S4 for taking out the spring.

  First, the preparation step S1 includes a step of preparing an external jig 8 to be installed on the outer peripheral side of the spiral groove 2 of the mold 1. The mold 1 is formed with a scooping portion 10 on the outer peripheral portion, and the external jig 8 is formed so as to be installed on the scooping portion 10. When the external jig 8 is installed on the scooping portion 10 of the mold 1, the external jig 8 is continuous with the outer end E2 of the spiral groove 2 and has a pitch P in the radial direction of the spiral curve with respect to the outermost peripheral groove of the spiral groove 2. An external groove 9 is provided on the outer peripheral side of the distance. The external jig 8 has the outer end member receiving groove 4 in the external groove 9. The external jig 8 is divided into a first external jig 8a and a second external jig 8b with the external groove 9 as a boundary. The external jig 8 may not be divided like the first and second external jigs 8a and 8b, but may be an integrated external jig 8 in which the external groove 9 is formed. Since the material of the mold 1 and the method of forming the spiral groove 2 and the inner end member receiving groove 5 on the surface of the mold 1 are the same as those in the first embodiment, the description thereof is omitted.

  Next, as shown in FIG. 9C, in the spring material installation step S2, the spring material 3 made of a wire material is installed in the spiral groove 2, and the first external jig 8a and the second external jig 8b are arranged. The spring material 3 is installed in the external groove 9 therebetween. Further, in the inner end member installation step S6, the inner end member 7 is installed in the inner end member receiving groove 5. In the outer end member installation step S8, the outer end member 6 is installed in the outer end member receiving groove 4. The inner end of the spring member 3 and the inner end member 7 are contacted or connected to the outer end of the spring member 3 and the outer end member 6. Then, the first and second external jigs 8a and 8b are fixed by holding plates 11a and 11b that press the first and second external jigs 8a and 8b from the outside. As the outer end member 6 or the inner end member 7, a material that is welded to the spring material 3 in the subsequent heat treatment step S3 can be used. Also, a brazing material can be installed at the contact portion between the outer end member 6 or the inner end member 7 and the spring material 3 to form an adhesive.

  Since the subsequent heat treatment step S3 and the removal step S4 are the same as those in the first embodiment, description of these steps is omitted. Thus, since the external groove 9 is formed on the outer peripheral side with respect to the distance of the pitch P in the radial direction of the spiral groove 2, the outer end member receiving groove 4 having a diameter larger than the pitch P can be connected. In the present invention, the scooping portion 10 is not an essential requirement, and the external jig 8 may be placed on the surface of the die 1 without forming the scooping portion 10 on the die 1. Further, after the heat treatment step S3 of the spring material 3, the outer end portion of the spring material 3 may be plastically deformed by using the external jig 8, and the brazing may be performed.

(Fourth embodiment)
FIG. 10 is a view for explaining a spring manufacturing method according to the fourth embodiment of the present invention. The type | mold 1 prepared in preparation process S1 differs from 1st embodiment. Therefore, different points will be described below. The same portions or portions having the same function are denoted by the same reference numerals.

  FIG. 10A is a schematic plan view of the mold 1 having the outer peripheral groove 13 in which the bent portion K is formed on the outer peripheral side of the spiral groove 2. Here, the spiral groove 2 is from the inner end E1 to the outer end E2, and the outer peripheral groove 13 is from the outer end E2 to the terminal end E3. The spiral groove 2 consists of an Archimedean curve with a constant radial pitch P. As shown in FIG. 10A, the mold 1 has an outer peripheral groove 13 formed at a position on the outer peripheral side with respect to the outermost peripheral groove of the spiral groove 2 with respect to the distance of the pitch P in the radial direction of the spiral curve. One end of the groove 13 continues to the outer end E <b> 2 of the spiral groove 2. The groove is bent at the outer end E2 where the outer peripheral groove 13 and the spiral groove 2 are connected. The outer peripheral groove 13 has a bent portion K, and the outer peripheral groove 13 between the bent portion K and the end E3 is formed at substantially equal intervals with respect to the outermost peripheral groove of the spiral groove 2. The mold 1 further includes an outer end member receiving groove 4 at the other end of the outer peripheral groove 13, that is, in the vicinity of the terminal end E3. In the present invention, it is not essential to prepare the mold 1 in which the inner end member receiving groove 5 and the outer end member receiving groove 4 communicating with the spiral groove 2 are formed. The end member 6 and the inner end member 7 may be connected.

  In this way, since the heat treatment is performed using the mold 1 in which the spiral groove 2 and the outer peripheral groove 13 are formed, the shape of the spring material 3 brazed to the spiral groove 2 and the outer peripheral groove 13 is stable for a long period of time, and highly accurate. Brazing is possible. Further, since the outer peripheral groove 13 is formed on the outer peripheral side with respect to the distance of the pitch P in the radial direction of the spiral groove 2, the outer end member receiving groove 4 having a diameter larger than the pitch P can be formed. Therefore, it is suitable for manufacturing a hairspring for a watch.

  FIG. 10B is a schematic plan view of a mold 1 that has an outer peripheral groove 13 on the outer peripheral side of the spiral groove 2 and in which the outer peripheral groove 13 and the spiral groove 2 are smoothly continuous. Here, the spiral groove 2 is from the inner end E1 to the outer end E2, and the outer peripheral groove 13 is from the outer end E2 to the terminal end E3. The spiral groove 2 is composed of an Archimedean curve having a constant radial pitch. As shown in FIG. 10B, the mold 1 has an outer peripheral groove 13 formed at a position on the outer peripheral side with respect to the outermost peripheral groove of the spiral groove 2 with respect to the distance of the pitch P in the radial direction of the spiral curve. One end of the groove 13 smoothly continues to the outer end E2 of the spiral groove 2. The outer circumferential groove 13 may circulate around the outer side of the spiral groove 2 a plurality of times. Even in this case, the outermost peripheral groove of the outer peripheral groove 13 is formed away from the outermost peripheral groove of the spiral groove 2 by a distance of the pitch P or more in the radial direction.

  Thus, since the spiral groove 2 and the outer peripheral groove 13 continue smoothly, the brazing shape of the connecting portion between the spiral groove 2 and the outer peripheral groove 13 can be stabilized for a long period of time, and highly accurate brazing can be performed. it can. Further, since the outer peripheral groove 13 is formed on the outer peripheral side with respect to the distance of the pitch P in the radial direction of the spiral groove 2, the outer end member receiving groove 4 having a diameter larger than the pitch P can be formed.

(Fifth embodiment)
FIG. 11 is a view for explaining a spring manufacturing apparatus according to the fifth embodiment of the present invention. The spring manufacturing apparatus 20 includes a spring material mounting means 21 for mounting a spring material 3 along the spiral groove 2 on a mold 1 having a spiral groove 2 having a spiral curve on the surface, and a mold 1 on which the spring material 3 is mounted. A spring material heat treatment means 22 for heat treatment and a spring material take-out means (not shown) for taking out the spiral spring 12 heat treated from the mold 1 are provided.

  This will be specifically described with reference to FIG. The spring material mounting means 21 includes a spring material storage unit 24 that stores the wound spring material 3, a transport roller 25 that transports the spring material 3, a guide plate 27 that guides the spring material 3 that is transported, and the spring material 3. It is comprised from the cutter 26 which cut | disconnects. The spring material 3 is pulled out from the spring material storage unit 24 and is introduced into the spiral groove 2 of the mold 1 in which a lid (not shown) is installed via a conveying roller 25 and a guide plate 27. When the spring material 3 is introduced to the inner end E1, the spring material 3 is cut by the cutter 26.

  The spring material heat treatment means 22 is composed of a heating furnace that heats the mold 1 to perform heat treatment. The mold 1 on which the spring material 3 is mounted is introduced from the spring material mounting means 21 to the spring material heat treatment means 22 by a conveying means (not shown) and subjected to heat treatment for a predetermined temperature and time. Next, the mold 1 is unloaded from the spring material heat treatment means 22 by a conveyance means (not shown). Next, a spring material take-out means (not shown) sucks and removes the lid installed on the mold 1 by the suction disk, and removes the spiral spring 12 brazed from the mold 1 by a robot arm (not shown). The spring manufacturing apparatus 20 can automatically perform a series of these operations.

1 type 2 spiral groove 3 spring material 4 outer end member receiving groove 5 inner end member receiving groove 6 outer end member 7 inner end member 8 external jig, 8a first external jig, 8b second external jig 9 External groove 10 Scooping portion 11a, 11b Holding plate 12 Spiral spring 13 Outer peripheral groove 20 Spring manufacturing device 21 Spring material mounting means 22 Spring material heat treatment means 24 Spring material storage unit E1 Inner end, E2 Outer end, E3 End P Pitch, K bent part

Claims (12)

A preparation step of preparing a mold having a spiral groove having a spiral curve on the surface;
A spring material installation step of installing a spring material in the spiral groove;
A heat treatment step of heat-treating the spring material together with the mold;
Removing the spiral spring from the mold, and
The preparation step includes a step of preparing an external jig to be installed on the outer peripheral side of the spiral groove of the mold,
The external jig is provided with an external groove that is continuous with the outer end of the spiral groove and is positioned on the outer peripheral side with respect to the outermost peripheral groove of the spiral groove with respect to the radial pitch distance of the spiral curve,
The spring material installation step includes a step of installing the spring material in the external groove.   The manufacturing method of the spring of Claim 1 provided with the coating process which apply | coats a coating agent to the side surface and bottom face of the said spiral groove.   The spring manufacturing method according to claim 1 or 2, wherein the heat treatment step is a step of performing heat treatment by installing a lid on the surface of the mold.   The said spring material installation process is a process of installing the said spring material which consists of a wire in the said spiral groove, The manufacturing method of the spring as described in any one of Claims 1-3.   The manufacturing method of the spring of Claim 4 provided with the adhesive material filling process which fills the said spiral groove with an adhesive agent.   The spring manufacturing method according to claim 4 or 5, wherein the heat treatment step is a step of brazing the spiral curve on the wire.   The spring manufacturing method according to any one of claims 1 to 6, wherein the spiral curve is an Archimedean curve. The mold has an inner end member receiving groove that is in the vicinity of the inner end of the spiral groove and is continuous with the spiral groove,
An inner end member installation step of installing an inner end member in the inner end member receiving groove;
The said heat processing process is a manufacturing method of the spring as described in any one of Claims 1-7 including the process of adhere | attaching the said spring material and the said inner end member. The mold has an outer end member receiving groove that is in the vicinity of the outer end of the spiral groove and is continuous with the spiral groove;
An outer end member installation step of installing an outer end member in the outer end member receiving groove,
The said heat processing process is a manufacturing method of the spring as described in any one of Claims 1-8 including the process of adhere | attaching the said spring material and the said outer end member. The mold has an outer peripheral groove at a position on the outer peripheral side with respect to the outermost peripheral groove of the spiral groove with respect to the radial pitch distance of the spiral curve,
The spring manufacturing method according to claim 1, wherein one end of the outer circumferential groove is continuous with an outer end of the spiral groove. The mold has an outer end member receiving groove in the vicinity of the other end of the outer peripheral groove,
An outer end member installation step of installing an outer end member in the outer end member receiving groove,
The method of manufacturing a spring according to claim 10, wherein the heat treatment step is a step of bonding the spring material and the outer end member. The external jig has an outer end member receiving groove in the external groove,
An outer end member installation step of installing an outer end member in the outer end member receiving groove,
The method of manufacturing a spring according to claim 1, wherein the heat treatment step includes a step of bonding the spring material and the outer end member.

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