JP2005028418A - Method and device for manufacturing spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring making method and device by which a coil-like spring is produced in a short time and in which no sludge is generated. <P>SOLUTION: A spring making device 10 produces a spring 5 by winding a wire W on a rotating mandrel 13 and by transferring a wire feeder 18 from a first clamp chuck 14 to a driving chuck 12. After a first spring 5A is sent to the right side, the wire W to be coiled on the mandrel 13 is supplied from the wire feeder 18 in a range extending from the coiling starting position P1 to the coiling ending position P2 to make a second spring 5B. During this process, a cutting tool 20 is delivered to the coiling starting end of the first spring 5A that remains in the position of a cutter line L, thereby machining the bearing surface on the end of the spring 5A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for manufacturing a coiled spring in which both end surfaces are formed on a seating surface.

Generally, a coiled spring is manufactured by either a space winding suitable for mass production or a core metal winding suitable for multi-product small-quantity production. As a method for manufacturing a spring by winding a metal core, for example, one disclosed in Patent Document 1 is known. According to this, as shown in FIG. 10, the spring manufacturing apparatus 30 includes a lathe-shaped apparatus main body 31, a power-rotating chuck 32, and a chuck that is detachably attached to the chuck 32, and a linear material is wound around the outer peripheral surface. A cored bar 34 that is elongated in the left-right direction, a guide bar 35 that is mounted on the front of the apparatus in parallel with the cored bar 34, and is slidably mounted on the guide bar 35 so that the linear material is a cored bar 34. And a feed base 36 that can be moved in the left-right direction by mounting the linear material holding member 37 so as to be wound around. And it sends out so that a linear material may be wound around the outer periphery of the metal core 34 with which the chuck | zipper 32 was mounted | worn from the linear material holding member 37 of the feed stand 36, and it moves linearly by moving the feed stand 36 rightward. The material was to be formed as a coiled spring. In addition, when forming a bearing surface in the spring end surface, the bearing surface processing was performed by grinding | polishing using a grindstone in another process.
Japanese Patent Laid-Open No. 2000-301272 (see pages 4 to 5 and FIG. 1)

  However, when the wound springs are cut one by one, especially in the case of a spring that is subjected to seating, the spring is generally made of a material such as spring steel (SUP), piano wire (SWRP), or wire (SWR). Since this type of material has a relatively high hardness, it cannot be cut with a general cutting tool and is cut with a polishing grindstone. When cutting a spring with a grinding stone, the wound end face of the linear material is ground with a grinding stone having a predetermined width, so that about one turn of the linear material is scraped off and the spring is scraped off. A lot of sludge mixed with iron powder and abrasive grains is generated. This sludge cannot be treated as industrial waste due to the presence of abrasive grains in both dry and wet cases, and especially in the case of wet, the abrasive grains contain water, which requires a problem in its treatment. It becomes. Also, when separating one spring that has been wound, after winding one spring, the rotation of the core metal must be stopped, and the linear material must be cut during the stop. Since the cutting speed is slow, there is a problem that it takes time to manufacture one spring.

  In the conventional apparatus 30 shown in Patent Document 1, since the feed base 36 is moved from the left side of the cored bar 34 to the right side of the linear member, the length of one spring is moved to the cored bar 34. Once wound, the mandrel 34 had to stop rotating and the cutting process had to be performed. Further, since the end surface polishing is not particularly disclosed, if the seat surface processing is performed on the end portion, it is cut with a polishing grindstone, and the above-described problems cannot be solved.

The present invention solves the above-described problems, and can manufacture a single spring in a short time, and a spring manufacturing method configured so as not to generate sludge when a linear material end is cut off. In order to solve the above problems, the spring manufacturing method according to the present invention is performed as follows. That is,
A method of manufacturing a spring in which a coil-shaped spring is formed by winding a linear material around a core metal and both end surfaces are formed on a seating surface,
With respect to the cutting position for cutting the end face of the linear material, the linear material is sent in a direction away from the cutting position, thereby cutting the end of the spring while being wound around the metal core. Surface processing is performed.

  Moreover, in invention of Claim 2, the said seat surface process is performed with a cutting tool, It is characterized by the above-mentioned.

Furthermore, according to the invention of claim 3, the spring manufacturing apparatus according to the present invention forms a coiled spring by holding one end of a cored bar on the drive chuck and winding a linear material around the cored bar. And a spring manufacturing apparatus for forming both end portions on the bearing surface,
A clamp chuck is disposed on the other end side of the cored bar,
A linear material feeding unit for feeding the linear material to the cored bar is arranged in parallel with the cored bar and is arranged to be movable along the axial direction of the cored bar,
In the vicinity of the clamp chuck opposite to the drive chuck, a cutting means for cutting the linear material wound around the core metal is disposed,
While the linear material fed from the linear material feeding unit is wound from the vicinity of the clamp chuck side toward the drive chuck side between the drive chuck and the clamp chuck, the cutting means The linear material is cut to perform seating surface processing.

  According to a fourth aspect of the present invention, the cutting means includes a cutting tool.

  Furthermore, the invention according to claim 5 is characterized in that a second clamp chuck is disposed on the opposite side of the clamp chuck with the cutting means interposed therebetween.

  According to the first aspect of the present invention, when the end surface of the linear material wound around the core metal is formed on the seat surface, one end surface of the linear material is removed while the linear material is wound around the core metal. Disconnect. In other words, by setting the feeding direction of the linear material wound around the core bar toward the opposite side to the cutting position of the linear material, the end surface position of the linear material to be cut is moved in the axial direction of the core metal. Since the wire is rotating together with the cored bar in the winding process, the cutting means is fed at the cutting position and cut while the wire is wound around the cored bar. be able to. Therefore, as compared with the conventional winding method in which the length of the spring is formed and then the rotation is stopped and the wire is cut, one cycle is longer than the length of one wire on the core metal. Since it is performed within the process of winding the spring, the manufacturing time of the spring can be performed in a very short time, and the productivity can be improved.

  In addition, since the cutting means is cut by cutting, for example, by using a cutting tool for high hardness instead of the polishing grindstone as in the invention described in claim 2, abrasive grains of the grindstone are generated as sludge. In this case, only iron powder can be generated as chips and discarded as industrial waste.

  According to the third aspect of the present invention, when the linear material is fed from the linear material feeding unit and wound around the core bar in the vicinity of the clamp chuck side between the drive chuck and the clamp chuck, the core is rotated by the rotation of the drive chuck. The gold is rotated, and the linear material feeding unit is moved along the axial direction of the core bar from the clamp chuck side toward the drive chuck side. Then, the linear material is spirally wound around the outer peripheral surface of the core metal, and when the length of one spring is reached, the linear material feeding unit moves in the reverse direction and is one long length. This spring is sent ahead of the clamp chuck by the length of one spring. Then, the second spring is wound again from the first position toward the drive chuck side. During this time, at the cutting position at the tip of the clamp chuck, the cutting means is fed toward one end face of the spring having a set length. Therefore, since the seating surface of the first spring can be formed while the linear material is wound around the core metal as the second spring, one cycle is linearly formed on the core metal if this is sequentially performed. It is performed within the process of winding the material to the length of one, so that it is possible to provide a spring manufacturing apparatus capable of improving the productivity by performing the manufacturing time of the spring in a short time.

  Then, as in the invention of claim 4, in this spring manufacturing apparatus, the cutting means is made of iron powder only without generating sludge by using a cutting tool for high hardness, for example. It can be discarded as industrial waste. Moreover, in cutting with a cutting tool, the cutting location of the linear material can be performed within the wire diameter range of the linear material, so that the amount of chips to be discarded can be minimized and the yield of the material can be improved. .

  Further, according to the invention described in claim 5, by disposing the second clamp chuck at the tip of the clamp chuck, it is possible to eliminate chattering of the core metal when cutting by the cutting means, and to make the spring bearing surface Processing can be performed reliably and the accuracy of the seating surface can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the spring manufacturing apparatus 10 of the embodiment includes an apparatus main body 11 configured in a lathe shape, a drive chuck 12 mounted on a head stock 111 of the apparatus main body 11, and one end on the drive chuck 12. A pair of clamp chucks (a first clamp chuck 14 and a second clamp chuck 15) that hold the spring 5 wound around the core metal 13 at an intermediate portion of the core metal 13; The support member 16 that supports the other end of the core bar 13 and the pair of guide rails 17 and 17 arranged in the longitudinal direction on the bed 112 of the apparatus main body 11 can be engaged with and moved with respect to the guide rails 17 and 17. And a linear material feeding unit 18 disposed in the.

  The drive chuck 12 uses a known collet chuck to rotatably drive the cored bar 13 that is connected to and held by the drive unit of the spindle stock 111. The pair of clamp chucks 14 and 15 are rotatably attached to the bed 112 via brackets 114 and 115 using a known collet chuck. The pair of clamp chucks 14 and 15 are arranged with an axis at a position coincident with the axis of the drive chuck in order to maintain the horizontal state of the core 13, and follow the rotation of the core 13. The chatter of the rotating core bar 13 that is rotated is prevented. A gap is provided between the first clamp chuck 14 and the second clamp chuck 15, a cutter line L is set in the gap, and the cutting tool 20 faces the axis of the core bar 13. It will be arranged to be able to enter and exit.

  The support member 16 includes a support portion 116 formed in a U shape and a bracket 117 rising from the bed 112, and supports the other end of the core metal 13.

  The linear material feeding unit 18 includes a moving table 181 that moves on the pair of guide rails 17, 17, a bracket unit 182 that rises from the moving table 181, and a feeding unit 183 that is supported by the bracket unit 182. A handle operating unit 184 that moves the feeding unit 183 back and forth toward the axis of the core bar 13 and a handle operating unit 185 that moves up and down to adjust the height of the feeding unit are provided. Note that the movement of the linear material feeding unit 18 in the left-right direction is automatically sent by a command from the control unit 19 disposed on the front side of the head stock 111.

  The linear material W used as the spring 5 is fed from a linear material feeding device (not shown) and fed so as to be wound around the core bar 13 through the feeding unit 183 of the linear material feeding unit 18. When the tip is wound around the core bar 13, the core bar 13 is rotated in either direction. At the same time that the linear material W is wound around the metal core, the linear material feeding unit 18 is moved from the first clamp chuck 14 side to the drive clamp chuck 12 side, and the seating surface is cut by the cutting tool 20. Thus, the spring 5 as shown in FIG. 3 is formed.

  In FIG. 3, the seating surface 5a of the spring 5 is cut by a cutting tool at an intermediate position between two springs 5A and 5B formed continuously. The cutting site depends on the blade width of the cutting tool. The cutting width is determined, and the width is smaller than the linear shape.

  Next, the process of manufacturing the spring 5 with the spring manufacturing apparatus 10 configured as described above will be described with reference to FIGS.

  First, the drive chuck 12 holding the metal core 13 is rotated in one direction by the drive unit of the apparatus main body 11. In this state, since the spring is not wound around the core metal 13 in the hollow portions of the first clamp chuck 14 and the second clamp chuck 15, there is no gap between the pair of clamp chucks 14 and 15 and the core metal 13. Has a gap corresponding to the wire W to be wound. In this state, as shown in FIG. 4, the linear material feeding unit 18 is moved to the vicinity of the first clamp chuck 14 (winding start position P1) between the drive chuck 12 and the first clamp chuck 14. At the same time, at the same time, the linear material W fed from a linear material feeding device (not shown) is fed from the feeding unit 183 of the linear material feeding unit 18 toward the core bar 13, The movement starts from the clamp chuck 14 side toward the drive chuck 12 side.

  Then, the leading end portion of the linear material W is locked to the cored bar 13 and is simultaneously wound around the outer peripheral surface of the cored bar 13 by the rotation of the cored bar 13. Further, as shown in FIG. 5, the wound linear material W spirals toward the drive chuck 12 at a predetermined pitch by the movement of the linear material feeding unit 18 along the guide rail 17. When it is wound and reaches the vicinity of the drive chuck 12 (winding end position P2), the coiled first spring 5A is formed.

  Since the length of one spring 5 is set by the control device, when reaching a predetermined length (winding end position P2), the movement of the linear material feeding unit 18 is stopped and the core is stopped. The rotation of the gold 13 is also stopped. During this stop, as shown in FIG. 6, when the linear material feeding unit 18 is moved back to the original position, that is, the winding start position P1, the end on the winding end side moves to the winding start position P1. Therefore, the other end of the first spring 5A, that is, one end on the winding start side moves to the right along with it. This position corresponds to the cutter line L. The first spring 5A is held by the clamp chuck 14.

  Next, as shown in FIG. 7, the cored bar 13 is rotated again and the linear material feeding unit 18 is moved to the drive chuck 12 side. The second spring 5B is formed from the winding start position P1 toward the drive chuck 12 side. While the second spring 5B is being formed, in the cutter line L, the cutting tool 20 is directed toward the core bar 13. Move. The end surface of the spring 5 that has been moved to the position of the cutter line L is cut by the cutting tool 20 to form a seating surface. In addition, this seat surface process uses the cutting tool 20 developed as a cutting tool for high hardness, and is not performed by the grinding process by a grindstone. Therefore, the end surface of the spring 5 rotating together with the core bar 13 is cut at its seating surface by the cutting tool. In the seating surface processing by this cutting tool, the winding direction of the linear material W newly flows from the clamp chuck 14 side to the drive chuck 12 side, that is, the left direction in the figure, so that the right end surface of the spring 5 has a fixed position. The seat surface is processed while the linear material W is being wound.

  Then, as shown in FIG. 7, when the second spring 5B is wound for a predetermined length and reaches the winding end position P2, the movement of the linear material feeding unit 18 stops and the core 13 rotates. Is stopped. Thereafter, as shown in FIG. 8, the first and second springs 5 </ b> A and 5 </ b> B are moved rightward in the figure by returning the linear material feeding unit 18 to the winding start position P <b> 1. A cutter line L is set between the second springs 5A and 5B. The first clamp chuck 14 holds the second spring 5B, and the second clamp chuck 15 holds the outer peripheral surface of the first spring 5A.

  Then, as shown in FIG. 9, while the third spring 5C is wound with the same action, the cutter line L is cut between the first spring 5A and the second spring 5B, Each will form a seating surface. The first spring 5A moves to the right in FIG. 9 and is discharged. Thereafter, the spring 5 is sequentially manufactured by repeatedly performing the above-described action of moving the linear material feeding unit 18 from the winding start position P1 to the winding end position P2.

  As described above, according to the spring manufacturing apparatus 10 of the embodiment, the linear material W is wound around the rotating core bar 13 and is driven from the first clamp chuck 14 side by the linear material feeding unit 18. Since the spring 5 is spirally wound so as to flow toward the left side in FIG. 5 by moving to the 12 side, the position of the right end of the spring 5 </ b> A stays in place while rotating. Therefore, if the position is set to the cutter line L where the cutting tool enters and exits, the seating surface processing of the spring 5 can be performed in the cutter line L. Therefore, since the seating surface processing is performed while winding the next spring 5B, the time in one cycle can be shortened and productivity can be improved. In addition, since a cutting tool that is not a grindstone is used for the seating of the end of the spring 5, it is possible to reduce the cutting time in the seating and to prevent generation of sludge. It becomes easy. Furthermore, the amount of chips can be reduced.

  In addition, the spring manufacturing apparatus of this invention is not limited to said form. For example, when the seating surface processing is performed with a cutting tool, the spring may be held by a first clamp chuck and the second clamp chuck may be deleted.

It is a front view which shows the spring manufacturing apparatus by one form to this invention. It is the same top view. It is a front view which shows a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is sectional drawing which shows the effect | action which manufactures a spring. It is a front view which shows the conventional spring manufacturing apparatus.

Explanation of symbols

5 (5A, 5B) Spring 10 Spring manufacturing device 11 Device main body 12 Drive chuck 13 Core metal 14 First clamp chuck 15 Second clamp chuck 17 Guide rail 18 Linear material feeding unit 20 Cutting tool P1 Winding start position P2 Winding end position L Cutter line W Linear material

Claims (5)

A method of manufacturing a spring in which a coil-shaped spring is formed by winding a linear material around a core metal and both end surfaces are formed on a seating surface,
With respect to the cutting position for cutting the end face of the linear material, the linear material is sent in a direction away from the cutting position, thereby cutting the end of the spring while being wound around the metal core. A method for manufacturing a spring, comprising performing surface processing. The method for manufacturing a spring according to claim 1, wherein the seating surface processing is performed by a cutting tool. An apparatus for manufacturing a spring in which one end of a cored bar is gripped by a drive chuck, a coiled spring is formed by winding a linear material around the cored bar, and both ends are formed on a seating surface,
A clamp chuck is disposed on the other end side of the cored bar,
A linear material feeding unit for feeding the linear material to the cored bar is arranged in parallel with the cored bar and is arranged to be movable along the axial direction of the cored bar,
In the vicinity of the clamp chuck opposite to the drive chuck, a cutting means for cutting the linear material wound around the core metal is disposed,
While the linear material fed from the linear material feeding unit is wound from the vicinity of the clamp chuck side toward the drive chuck side between the drive chuck and the clamp chuck, the cutting means An apparatus for manufacturing a spring, characterized in that a linear material is cut and a seating surface is processed. The spring manufacturing apparatus according to claim 3, wherein the cutting means includes a cutting tool. 5. The spring manufacturing apparatus according to claim 3, wherein a second clamp chuck is disposed on the opposite side of the clamp chuck with the cutting means interposed therebetween.