JP4964826B2 - Coil spring both-end grinding machine - Google Patents

Description

  The present invention relates to grinding of both end faces of a coil spring. Specifically, the present invention relates to grinding of both end faces of a coil spring that is ground while cooling the coil spring.

  In grinding both ends of the coil spring, when grinding both end surfaces of the coil spring by passing between the grinding stones continuously or intermittently for a long time, the end surface of the coil spring becomes hot due to heat generated by grinding on the grinding wheel grinding surface, Hardness and mechanical properties may change or the coil shape may be deformed. In particular, in order to increase productivity, the tendency becomes remarkable when the grinding allowance is increased or the grinding wheel is rotated at a high speed.

  As a countermeasure, a spring that passes through the machine is provided by supplying means for supplying a coolant to a grinding range where the coil spring is gradually ground from the end, thereby preventing or fundamentally reducing the heat generation of the ground spring. There is known a grinding apparatus in which the supply speed of the steel is increased (see, for example, Patent Document 1). As shown in FIG. 10, in this grinding apparatus, a coolant nozzle 45 is attached to each grinding unit, and is supplied between the belt running parts, so that the end of the coil spring is ground and the grinding belt running part in the grinding range is ground. The refrigerant is supplied to the tank. This grinding device supplies cooling liquid to the polishing belt running part in the grinding range, but it is necessary to perform post-processing such as recovery and disposal of the cooling liquid and post-processing such as cleaning and drying of the spring after grinding. was there.

As another countermeasure, the automobile valve spring held in the pocket of the polishing carrier is continuously passed a plurality of times between a pair of CBN grinding wheels as the polishing carrier rotates, and one of the grinding wheels is pivoted between them. The both ends of the automotive valve spring are down-feed polished with a pair of CBN grindstones, and a light alloy such as an aluminum alloy is used for the pedestal part of the CBN grindstone, and an air supply source is provided at the center of the pedestal part. A polishing apparatus in which circular holes to be connected are formed is known (for example, see Patent Document 2). This polishing apparatus is configured to blow cooling air from an air supply source from a circular hole portion at the center of the pedestal portion of the CBN grindstone, and cool the pedestal portion and the grindstone portion with this cooling air.
That is, by using a CBN grindstone with excellent heat dissipation and reducing the feed heat by down-feed polishing, a light alloy such as an aluminum alloy with excellent heat dissipation is used for the pedestal of the CBN grindstone, and the pedestal Cooling air is blown out from the circular hole at the center, and the pedestal and the grindstone of the CBN grindstone are cooled to suppress polishing heat due to polishing.

However, this polishing apparatus has a drawback that it cannot efficiently dissipate the polishing heat when the material of the grindstone and its pedestal is not particularly excellent in heat dissipation.
JP-A-61-203257 JP 2002-103189 A

  The problem to be solved by the present invention is that there is no need for post-treatment such as coolant recovery / disposal, post-grinding spring cleaning or drying, etc., and heat dissipation in grinding both ends of the coil spring. It is intended to provide a coil spring both-end grinding machine capable of grinding both end faces while efficiently cooling the spring, without being limited to a grindstone or a pedestal portion made of an excellent material.

  The coil spring double-side grinding machine according to claim 1 of the present invention, which has been made to achieve the above object, is a coil spring double-side grinding machine that processes both ends of the coil spring. A pair of grinding wheels in which at least one of them is rotated in the state of being rotated and moved in the grinding wheel axial direction, and a coil spring guide board provided with a coil spring holding hole penetrating in the grinding wheel axial direction along the outer periphery. A coil spring guide board moving mechanism for moving the coil spring guide board back and forth so that the coil spring holding hole is in the region between the grinding wheels between the two grinding wheels, and a sliding surface substantially flush with the grinding surface of the grinding wheel In addition, a flow path capable of passing a cooling medium is formed inside, and cooling is performed on a cooling plate provided in parallel with each grinding wheel and provided with sliding surfaces facing each other, and a cooling plate provided on the opposite side. A cooling device for passing the medium; After the coil spring that is held in the coil spring holding hole and moves as the coil spring guide board advances and retreats is pressed through the area between the grinding wheels between the grinding surfaces facing the grinding wheel and both ends are ground Next, the most important feature is that the cooling plate is cooled while being pressed between the opposing sliding surfaces of the cooling plate.

  Further, in the coil spring both-end grinding machine according to the second aspect of the invention, the cooling plate juxtaposed to the grinding wheel capable of being cut and moved in the grinding wheel axis direction is cut and moved in the grinding wheel axis direction integrally with the grinding wheel. It is possible.

  Furthermore, in the coil spring both-end grinding machine according to the invention described in claim 3, the cooling plate arranged in parallel with the grinding wheel capable of being cut and moved in the grinding wheel axial direction is adjusted in position in the grinding wheel axial direction with respect to the grinding wheel. It is possible.

  Furthermore, the coil spring both-ends grinding machine according to claim 4 is characterized in that the cooling medium is cooled by a cooling device and then supplied to the flow path of the cooling plate.

  Further, the coil spring both-ends grinding machine according to the invention of claim 5 is characterized in that the cooling medium is liquid or gas.

  Furthermore, the double-sided grinding machine for coil springs according to the invention of claim 6 is characterized by comprising automatic discharge means for automatically discharging the coil springs after completion of the grinding process.

  Furthermore, the both ends grinding machine of the coil spring according to the invention of claim 7 includes coil spring automatic supply means for automatically supplying the coil spring before grinding to the coil spring holding hole of the coil spring guide disk. To do.

  Furthermore, in the coil spring both-end grinding machine according to the invention described in claim 8, a nozzle is provided in a region between the grinding wheels between the grinding wheels so that a cooling medium can be injected toward both ends of the coil spring. Features.

  In the coil spring double-end grinding machine according to the first aspect of the present invention, the coil spring held in the coil spring holding hole and moving with the rotation of the coil spring guide disk is pressed between the grinding surfaces facing the grinding wheel and passes. After both ends are ground, the coil springs are cooled while being pressed between the sliding surfaces of the opposing cooling plates, so that the coil springs that generate heat are ground immediately after grinding. Since the surface can be directly cooled by the cooling plate, there is an advantage that the temperature rise of the coil spring can be efficiently suppressed. As a result, the grinding allowance can be increased or the grinding wheel can be rotated at high speed, and the productivity of both-end grinding of the coil spring is improved.

  Furthermore, the invention of claim 2 has the advantage that it is not necessary to adjust the position of the cooling plate in the direction of the grinding wheel axis every time the grinding wheel is cut.

  Furthermore, the invention of claim 3 re-grinds the grinding surface of the grinding wheel to change the relative position between the grinding surface of the grinding wheel and the sliding surface of the cooling plate, so that the cooling plate slides on the grinding surface of the grinding wheel. There is an advantage that the original relative position can be reproduced by adjusting the moving surface position.

  Furthermore, the invention of claim 4 has an advantage that the cooling plate can be cooled to a set temperature lower than the ambient temperature because the cooling medium is cooled by the cooling device and then supplied to the flow path of the cooling plate.

  Furthermore, the invention of claim 5 is characterized in that a liquid such as water or a gas such as carbon dioxide gas cooled to a set temperature lower than the ambient temperature is passed through a flow path provided inside the cooling plate, thereby Since it can cool efficiently, there exists an advantage that the coiled spring which is pressed between the sliding surfaces of the opposing cooling plate and can pass can be cooled efficiently.

  Furthermore, since the invention of claim 6 is provided with an automatic discharge means for automatically discharging the coil spring after completion of the grinding process, the coil spring after completion of the grinding can be automatically discharged, thereby improving work efficiency. There are advantages.

  Furthermore, the invention of claim 7 has an advantage that the coil spring before grinding can be automatically supplied to the coil spring holding hole of the coil spring guide disk, and the work efficiency is improved.

  Further, in the invention of claim 8, since the nozzle is provided in the region between the grinding wheels between the grinding wheels so that the cooling medium can be sprayed toward both ends of the coil spring, the both ends of the coil spring are directly connected with the cooling medium. There is an advantage that the coil spring can be cooled more efficiently.

An embodiment of a coil spring both-end grinding machine of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a coil spring both-end grinding machine of the present invention. FIG. 5 is a side view showing the main part.
As shown in FIG. 1, the both-ends grinding machine 10 of the coil spring 90 is equipped with a pair of movable base parts 13A and 13B in the frame 12 installed on the floor. The frame 12 has a structure in which the upper frame 12A and the lower frame 12B are integrated. Between the upper frame 12A and the upper movable base portion 13A, a ball screw mechanism 13G and a vertical direction are provided. An extended linear guide 13R (see FIG. 2) is provided. Then, the ball screw mechanism 13G is operated by the grindstone vertical drive motor 13M, and the movable base portion 13A is positioned at an arbitrary vertical position. A linear guide and a ball screw mechanism (both not shown) are also provided between the lower frame 12B and the lower movable base portion 13B, and the ball screw is moved by a manual handle (not shown). In order to adjust the position of the grinding surface when rotating and regrinding the grinding surface 21a of the grinding wheel 21, the vertical position is adjusted.

  The movable base portion 13A is provided with a bearing portion 13a (see FIG. 5) extending in the vertical direction, and a drive shaft 14A is rotatably supported by the bearing portion 13a. A grindstone drive motor 15A is connected to the upper end of the drive shaft 14A by a pulley and a belt (both not shown). The lower end portion of the upper drive shaft 14A slightly protrudes from the bearing portion 13a, and the grinding wheel 20 is fixed to the protruding lower end portion so as to be integrally rotatable.

  Similarly, the lower movable base portion 13B extends in the vertical direction and is provided with a bearing portion 13b. The bearing portion 13b is rotatably supported by a drive shaft 14B coaxially with the upper drive shaft 14A. Yes. A grindstone drive motor 15B is connected to a lower end portion of the drive shaft 14B by a pulley and a belt (both not shown). The upper end portion of the lower drive shaft 14B slightly protrudes from the bearing portion 13b, and the grinding wheel 21 is fixed to the protruding upper end portion so as to be integrally rotatable.

  These grinding wheels 20 and 21 are both disk-shaped and have the same outer diameter. The grinding surfaces 20a and 21a facing each other of the grinding wheels 20 and 21 are both flat surfaces orthogonal to the rotation axes (hereinafter also referred to as grinding wheel shafts) 20J and 21J of the grinding wheels 20 and 21.

  A nut 70A is attached to the upper movable base 13A near the front side of the machine on the right side of FIG. 1, and a ball screw 70B is suspended in the vertical direction by screwing into the nut 70A. As shown in FIG. 3, the ball screw 70B has, in order from the top, a screw portion 70a, a shaft portion 70b having a larger outer diameter than the screw portion, a bearing portion 70c having a smaller outer diameter than the shaft portion, and an outer diameter further than that of the bearing portion. It is composed of a small gear mounting portion 70d. A bearing 70e is attached to the bearing portion 70c by receiving thrust on its stepped surface, and a gear box 72 is attached so that the bearing 70e can be fitted and can rotate but cannot move in the axial direction. A collar 72a is fixed to the upper surface of the gear box 72, and a cylindrical member 72b is rotatably attached to the collar 72a via a shaft portion 70b of a ball screw 70B and a bearing. A collar 72c is fixed to the upper part of the cylindrical member 72b. On the front side of the collar 72c and the gear box 72, a front plate 73 is attached by bolts so as to cover the upper part of the front surface of the both-end grinding machine, and the front plate 73 and the ball screw 70B can be moved up and down integrally. Further, the lower end of the front plate 73 is provided with block portions 73a and 73a that protrude horizontally forward at a distance in the middle of the left and right, and on the lower surface of the block portions 73a and 73a, there is an upper grinding wheel. The upper cooling plates 75A and 75B are horizontally mounted with the lower surface aligned with the 20 grinding surfaces 20a and spaced from each other to the left and right. The upper cooling plates 75A and 75B can be moved up and down at the same time when the ball screw mechanism 13G is operated by the grindstone vertical drive motor 13M to move the movable base portion 13A up and down.

  On both sides of the front plate 73, blocks 74 provided with vertical through holes 74a are attached. Further, guide bars 12C extending in the vertical direction are provided on both side surfaces of the front surface side of the frame 12A, and are provided at a distance from the side surfaces of the frame 12A. Through holes 74a of the blocks 74 are formed in the guide bar 12C. It fits and can slide.

  A worm wheel 71B is attached to the gear attachment portion 70d of the ball screw 70B, and a worm shaft 71A (see FIG. 2) provided with a worm screw at the tip so as to mesh with the worm wheel 71B is a gear box 72. It is attached so that it can rotate freely from the front diagonal direction. A handle 78 is attached to the opposite side of the worm shaft 71A from the worm.

  When the handle 78 is turned manually, the worm shaft 71A rotates and the worm wheel 71B meshing with the worm screw rotates. When the worm wheel 71B rotates, the ball screw 70B rotates, and the ball screw 70B moves up or down with respect to the nut 70A. At the same time, the gear box 72 moves up or down integrally with the ball screw 70B, and the front plate 73 fixed to the gear box 72 is guided by the guide bars 12C and 12C attached to both sides of the frame 12A. Move up or down. The vertical direction is determined by the rotation direction of the handle 78.

  And the lower surface position (hereinafter also referred to as sliding surface position) of the cooling plates 75A and 75B attached to the lower end of the front plate 73, the position of the upper grinding wheel 20 relative to the grinding surface 20a is turned by manually turning the handle 78. Can be adjusted. Therefore, even if the grinding surface 20a of the grinding wheel 20 is re-polished to change the relative position between the grinding surface 20a of the grinding wheel 20 and the sliding surfaces of the cooling plates 75A and 75B, the cooling plate with respect to the grinding surface 20a of the grinding wheel 20 is changed. The original relative position can be reproduced by adjusting the sliding surface positions of 75A and 75B. Usually, the lower surface positions of the cooling plates 75A and 75B are made substantially the same as the grinding surface 20a of the upper grinding wheel 20.

  Slow tapers 75a and 75b are provided at positions where the coil springs 90 enter the upper cooling plates 75A and 75B, so that the coil springs 90 can move smoothly.

In each of the cooling plates 75A and 75B, as shown in FIG. 4, a plurality of flow paths 75p having openings are formed in the vertical direction and the horizontal direction. Then, the middle of the flow path is blocked by the plugs 75u, 75u, 75u, 75u, a part of the openings are closed by the plugs 75v, 75v, and the adjacent openings excluding the inner ends of the remaining openings. Each channel 75p is formed by connecting each other with a pipe 76p so that each channel 75p becomes a single channel while zigzag. The openings at both ends of the opening are connected to a cooling device (not shown) by a pipe 76a and a pipe 76b, respectively.

  With such a configuration, the cooling medium that is lowered from the cooling device to the set temperature and sent through the pipe 76a passes through a single flow path of the cooling plates 75A and 75B, and then passes through the pipe 76b to cool the cooling device. Returned to The cooling plates 75A and 75B are cooled while the cooling medium passes through the cooling plates 75A and 75B.

  The coil spring end processing machine 10 is provided with a coil spring guide board moving mechanism 50 for allowing the coil spring 90 to pass through a region R1 between the grinding wheels between the grinding wheels 20 and 21. The coil spring guide board moving mechanism 50 is attached to a support base 51 projecting laterally from the frame 12B. As shown in FIGS. 1 and 6, cooling plates 55 </ b> A and 55 </ b> B are attached to the upper surface of the support base 51. As shown in FIG. 6, the cooling plate 55A is sandwiched between the grinding wheel 21 and a discharge chute movable plate 55S for discharging the coil spring 90 after grinding. The cooling plate 55B is in contact with the discharge chute movable plate 55S. They are lined up to form an L shape. The upper surfaces of the cooling plates 55A and 55B and the discharge chute movable plate 55S are adjusted to be the same surface, and the planar shape formed by these is a U-shaped sliding surface. The upper surfaces of the cooling plates 55A and 55B and the discharge chute movable plate 55S are adjusted by rotating the manual handle so that the end surface 21A of the lower grinding wheel 21 is on the same plane. Each of the cooling plates 55A and 55B is provided with an arc-shaped cutout portion 55r that is concentric with the grinding wheel 21 and slightly larger in diameter than the grinding wheel 21 in order to avoid interference with the lower grinding wheel 21. Yes. Further, gentle tapers 55a and 55b are provided on the lower cooling plates 55A and 55B on the side where the coil spring 90 enters, so that the coil spring 90 moves smoothly.

  In each of the cooling plates 55A and 55B, as shown in FIG. 6, a plurality of flow paths 55p having openings are formed in the vertical direction and the horizontal direction. Then, the middle of the flow path is blocked by the plugs 55u and 55u, a part of the openings are closed by the plugs 55v and 55v, and the adjacent openings excluding the inner ends of the remaining openings are connected to the pipe 56p. , 56p, 56p, 56p, and the like so that each flow path 55p becomes a single flow path while zigzag. The remaining openings at both ends of the opening, that is, the opening at the extreme end of the cooling plate 55A and the opening at the extreme end of the cooling plate 55B are respectively connected to a cooling device and pipes 56a and 56b (not shown). It is connected with. The cooling medium that is lowered from the cooling device to the set temperature and is sent through the pipe 56a passes through a single flow path of the cooling plates 55A and 55B, and then returns to the cooling device through the pipe 56b. The cooling plates 55A and 55B are cooled while the cooling medium passes through the cooling plates 55A and 55B.

  A table rotation drive motor 57 is fixed to the lower surface of the support base 51. The rotary shaft 61 that is key-coupled to the output shaft of the table rotation drive motor 57 projects upward through a through hole provided in the support base 51. A support sleeve is fixed to the upper portion of the support base 51, and a rotary shaft 61 is pivotally supported by a bearing therein. The upper end portion of the rotary shaft 61 is formed so that the upper surface is higher than the upper surfaces of the cooling plates 55A and 55B attached to the upper surface of the support base 51 and the flange portion 61B is exposed. A cylindrical portion 61C having a smaller outer diameter than the flange portion 61B protrudes above the flange portion 61B. And the rotary table 62 (coil spring guide board of this invention) is being fixed to the upper surface of the collar part 61B by being inserted in this cylindrical part 61C.

  The rotary table 62 is a disk, and the other is a U-shape formed by the cooling plates 55A and 55B and the discharge chute movable plate 55S so that a part thereof is in the inter-grinding region R1 between the grinding wheels 20 and 21. It is arranged so as to fit on the sliding surface. In addition, the rotary table 62 is provided with coil spring holding holes 62 </ b> A penetrating in the direction of the grindstone axis at equal intervals along the outer periphery. With such a configuration, the rotary table 62 can be intermittently rotated or continuously rotated by driving the table rotation drive motor 57.

  A spring feeding device (not shown) is provided on the side opposite to the grinding wheels 20 and 21 with respect to the coil spring guide board moving mechanism 50. In order to sequentially move the coil spring 90 positioned at the take-out position 42 from the spring feeding device to each coil spring holding hole 62A, a spring feeder 46 (coil spring automatic supply means of the present invention) is provided (FIG. 1). reference). The spring feeder 46 is provided with a slider 45 on the side surface portion of the gantry 46 </ b> A disposed above the take-out position 42. The slider 45 linearly moves in the horizontal direction while reciprocating between the rotary table 62 and the take-out position 42 while being located above the rotary table 62 and the take-out position 42. An air cylinder 43A is attached to the slider 45, and a linear motion rod 43B is inserted into the air cylinder 43A so as to be linearly movable. The linear motion rod 43B protrudes downward from the lower end portion of the air cylinder 43A, and a movable hand 44 is attached to the lower end portion of the linear motion rod 43B. The movable hand 44 includes a pair of opposed claws, and the coil spring 90 can be held by the opposed claws.

  The movable hand 44 of the present embodiment is configured to hold the coil spring 90 by closing a pair of opposed claws and inserting the claws into the inside of the coil spring 90 and opening the opposed claws and pressing them against the inner surface of the coil spring 90. It has become.

  The spring feeder 46 operates in the following manner in synchronization with the rotary table 62. That is, the linear motion rod 43B moves horizontally with the slider 45 in a state where it is positioned upward, and moves downward when positioned above the take-out position 42 to hold the coil spring 90 positioned at the take-out position 42 with the opposing claws. To do. In this state, the linear motion rod 43 </ b> B moves upward to take out the coil spring 90 from the take-out position 42. Next, the slider 45 moves to the coil spring guide board moving mechanism 50 side. Then, the direct acting rod 43B moves downward to insert the coil spring 90 into the coil spring holding hole 62A, and the movable hand 44 releases the holding of the coil spring 90. Hereinafter, the coil spring 90 is sequentially accommodated in the plurality of coil spring holding holes 62A of the coil spring guide board moving mechanism 50 by repeating this operation.

  As shown in FIG. 6, a discharge chute movable plate 55S is provided with both sides sandwiched between a cooling plate 55A and a cooling plate 55B. The discharge chute movable plate 55S can be opened and closed. The upper surface of the discharge chute movable plate 55S is adjusted to be flush with the upper surfaces of the cooling plates 55A and 55B. When the discharge chute movable plate 55S is closed, the upper surface of the discharge chute movable plate 55S is placed on the coil spring 90. Passes through the sliding contact and the discharge chute movable plate 55S is opened, it is discharged from the coil spring holding hole 62A into a discharge port (not shown).

The structure of the both ends grinding machine 10 of the coil spring of this embodiment is the above.
Next, the action of the both-end grinding machine 10 of this coil spring will be described.
Before starting the double-side grinding machine 10, water as a cooling medium is cooled in advance by a cooling device (not shown) until it reaches a set temperature, and circulates to the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B. The upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B are cooled to a set temperature lower than the ambient temperature. When the both ends grinding machine 10 of the coil spring is activated, the upper grinding wheel 20 moves to a position farther than the distance between the lower grinding wheel 21 and the rotary table 62 together with the upper cooling plates 75A and 75B. Next, the rotary table 62 rotates intermittently in one direction, and the spring feeder 46 inserts the coil spring 90 into each coil spring holding hole 62A. When the coil spring 90 is accommodated in all the coil spring holding holes 62A drilled in the rotary table 62, the upper grinding wheel 20 moves down to the set position together with the upper cooling plates 75A and 75B, and the upper and lower grinding wheels 20 , 21 is in a state where the rotary table 62 is arranged. At this time, the coil spring 90 is positioned with its outer periphery being gently regulated in the coil spring holding hole 62A of the rotary table 62, and is slightly bent by the grinding allowance as the upper cooling plates 75A and 75B are lowered. It is in a state.

  Next, the table rotation drive motor 57 rotates the rotation table 62 in the counterclockwise direction in FIG. 6, and the grindstone drive motors 15A and 15B rotate both the grinding wheels 20 and 21 in the counterclockwise direction in FIG. To do. Then, both end portions of the coil spring 90 accommodated in the coil spring holding hole 62A are brought into contact with the grinding surfaces 20a, 21a of the grinding wheels 20, 21 and are subjected to surface grinding. When the coil spring 90 exits from the inter-grinding region R1 between the grinding wheels 20 and 21, the respective sliding surfaces facing the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B are: Since the grinding wheels 20 and 21 are adjusted to be flush with the grinding surfaces 20a and 21a of the grinding wheels 20, the coil spring 90 is located between the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B. In a state of being bent by the remaining grinding allowance while receiving a reaction force due to the spring force of the deflection amount. At this time, since the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B are in a cooled state, both end surfaces of the coil spring 90 that has generated heat by grinding pass while being in contact with the cooling. In this state, when grinding and cooling of both end faces of the coil spring 90 are repeated for the set number of times, the upper grinding wheel 20 again drops by a set amount together with the upper cooling plates 75A and 75B. Then, again, the coil spring 90 is slightly bent by the grinding allowance, and is ground by the grinding wheels 20 and 21, while the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B are ground. The coil spring 90 moves with the rotation of the rotary table 62 while both the heated ground surfaces are cooled by contacting the sliding surface. At this time, since the upper cooling plates 75A and 75B are lowered integrally with the grinding wheel 20, it is not necessary to adjust the position of the cooling plates 75A and 75B in the grinding wheel axis direction every time the grinding wheel 20 is cut.

  When the rotary table 62 is rotated a set number of times, the upper grinding wheel 20 is lowered by a set amount, the rotary table 62 is further rotated a set number of times, and both end surfaces of the coil spring 90 are ground. This operation is repeated until the total length of the coil spring 90 finally reaches the set value. As a result, the rotating coil spring 90 held and rotated in the coil spring holding hole 62A of the rotary table 62 is ground while passing between the grinding surfaces of the grinding wheels 20 and 21, and the cooled upper cooling is performed. The plates 75A and 75B and the lower cooling plates 55A and 55B are pressed and passed between the opposing sliding surfaces, and grinding is performed while the heat generated by the grinding is cooled. Then, flat surfaces are formed at both ends of all the coil springs 90, and the total length becomes the set length.

  When both ends of all the coil springs 90 accommodated in the coil spring holding holes 62A of the rotary table 62 are ground, the discharge chute movable plate 55S is automatically rotated to open the discharge port, and is ground to the set length. The coil springs 90 are successively dropped and discharged from the discharge port. At this time, a pressing linear member that is driven by a cylinder or the like may be provided, and the coil spring 90 may be forcibly pushed out and discharged. When all the coil springs 90 are discharged from the coil spring holding holes 62A of the turntable 62, the discharge chute movable plate 55S rotates and the discharge port is closed, and the spring feeder 46 automatically moves to each coil spring holding hole 62A. The coil springs 90 before being ground are sequentially inserted. Thereafter, the operation of grinding both end faces of the coil spring 90 while being cooled by the cooling plates 75A, 75B and 55A, 55B is repeated in the same manner as described above.

As described above, the coil spring 90 that has generated heat by grinding is subjected to continuous grinding immediately after grinding while both ends of the coil spring 90 are directly cooled by the cooling plates 75A, 75B and 55A, 55B. Therefore, the coil spring 90 can be ground efficiently while suppressing the temperature rise of the coil spring 90, and the coil spring 90 with high accuracy can be produced without changing the hardness and mechanical properties and without changing the coil shape.
Even if the material of the grindstone or its pedestal is not particularly excellent in heat dissipation, the coil spring 90 can be directly cooled by the cooling plates 75A, 75B and 55A, 55B. Can be efficiently cooled.

Further, the upper cooling plates 75A and 75B are moved up and down at the same time when the movable base portion 13A is moved up and down by operating the ball screw mechanism 13G by the wheel up and down drive motor 13M. It is not necessary to adjust the position of the cooling plates 75A and 75B in the direction.
Furthermore, the lower surface position of the cooling plates 75A and 75B attached to the lower end of the front plate 73 can be adjusted with respect to the grinding surface 20a of the upper grinding wheel 20 by manually turning the handle 78. Even if the grinding surface 20a of the grinding wheel 20 is re-polished and the relative position between the grinding surface 20a of the grinding wheel 20 and the sliding surface of the cooling plates 75A and 75B changes, the handle 78 is turned by hand to cool the grinding plate 20 to the grinding surface of the grinding wheel 20 The original relative position can be reproduced by adjusting the sliding surface positions of 75A and 75B.
Further, the cooling medium which is lowered from the cooling device to the set temperature and sent through the pipe 76a passes through the cooling plates 75A, 75B and 55A, 55B while passing through the cooling plates 75A, 75B and 55A, 55B. Since cooling is performed, the cooling plates 75A and 75B and 55A and 55B can be cooled to a set temperature lower than the ambient temperature.
Furthermore, by using water, liquefied gas, or the like as the cooling medium, the cooling plates 75A, 75B and 55A, 55B can be efficiently cooled, so that the cooling plates 75A, 75B, 55A, 55B facing each other can be slid. The coil spring 90 that is pressed between the moving surfaces and passes through can be efficiently cooled.
Further, the coil spring 90 after grinding can be automatically discharged, and the coil spring 90 before grinding can be automatically supplied to the coil spring holding hole of the rotary table 62, thereby improving the work efficiency. Can be made.
Furthermore, since the nozzle is provided in the area between the grinding wheels between the grinding wheels so that the cooling medium can be sprayed toward both ends of the coil spring, both ends of the coil spring can be directly cooled by the cooling medium. The spring can be cooled more efficiently.

<Other embodiments>
As Example 2, in addition to the lower cooling plates 55A and 55B and the upper cooling plates 75A and 75B in Example 1, as shown in FIGS. When both end portions of the coil spring 90 which are provided in the coil spring holding hole 62A of the rotary table 62 and are rotated and transferred are ground by the grinding surfaces 20a and 21a of the grinding wheels 20 and 21, the nozzle 80 is provided. , 81 may inject the cooling medium. The cooling medium is supplied after passing through the flow paths of the cooling plates 75A and 75B for the nozzle 80, and after passing through the flow paths of the cooling plates 55A and 55B for the nozzle 81. The nozzles 80 and 81 are provided with a plurality of nozzle holes 80a and 81a toward both ends of the coil spring 90 and the grindstone grinding surfaces 20a and 21a. Then, both ends of the coil spring 90 and the grindstone grinding surfaces 20a and 21a are injected. The cooling medium may be air or a liquefied gas such as nitrogen gas. In the case of liquefied gas, the cooling effect is high, and the coil spring 90 can be efficiently cooled.

  Thus, since the nozzles 80 and 81 are provided in the inter-grinding wheel region R1 between the grinding wheels 20 and 21 so that the cooling medium can be sprayed toward both ends of the coil spring 90, the coil spring 90 is directly applied with the cooling medium. Both ends and the grinding wheels 20 and 21 can be cooled, and the coil spring 90 can be cooled more efficiently.

  The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  In the above-described embodiment, the upper cooling plates 75A and 75B are horizontally mounted with a distance from each other at a distance from the left and right. However, a sliding or swinging movable cooling plate is provided on the separated portion of the central portion. When the coil spring 90 is accommodated in the coil spring holding hole 62A, the movable plate may be opened so that the coil spring holding hole 62A is opened, and the movable plate may be closed when the coil spring 90 is ground. In the movable cooling plate, a single flow path is formed in the same manner as the cooling plates 75A and 75B, and the cooling medium sent to the set temperature from the cooling device is cooled through the single flow path. You may do it. By doing so, the coil spring 90 can be further cooled.

  In the above embodiment, the cooling plates 75A, 75B and 55A, 55B together form a single flow path. However, as shown in FIGS. 9A and 9B, the same as in the above embodiment. In the plurality of flow paths 75p or 55p that are perforated in the vertical and horizontal directions with the openings, the middle of the flow path is blocked by the plugs 75u or 55u, or some of the openings are plugged 75v or A plurality of U-shaped channels having openings a and b adjacent to each other are formed by closing at 55v, and the openings a and b of the U-shaped channels are connected by a pipe. In addition, the openings a may be connected to the supply pipe A from the cooling device, and the openings b may be connected to the supply pipe B from the cooling device. Here, FIG. 9A shows the upper cooling plates 175A and 175B, and FIG. 9B shows the lower cooling plates 155A and 155B. By doing so, the cooling plates 175A, 175B and 155A, 155B can be cooled with less cooling unevenness, and the cooling effect can be increased.

  The discharge chute movable plate 55S is also formed with a U-shaped flow path having openings a and b adjacent to each other, the opening a is connected to a supply pipe A from the cooling device, and the opening b is a cooling device. You may make it connect with the supply pipe B from. By doing so, the cooling effect can be further increased.

  In the above embodiment, the respective sliding surfaces of the upper cooling plates 75A and 75B and the lower cooling plates 55A and 55B facing each other are adjusted to be the same as the respective grinding surfaces of the grinding wheels 20 and 21. However, the dimension between the sliding surfaces of the cooling plates 75A and 55B on the side where the coil spring 90 enters the inter-grinding region R1 between the grinding wheels 20 and 21 is set to the grinding surfaces of the grinding wheels 20 and 21, respectively. You may make it make it substantially smaller than the dimension between 20a and 21a. By doing so, the length of the coil spring 90 that is moved by the rotary table 62 and enters the inter-grinding region R1 becomes smaller than the dimension between the grinding surfaces 20a, 21a of the grinding wheels 20, 21, and enters the inter-grinding region R1. You can move smoothly.

  In the above-described embodiment, a gentle taper 75b is provided at the position where the coil spring 90 enters the upper cooling plate 75B, and a gentle taper 55a is provided on the side where the coil spring 90 enters the lower cooling plate 55A. The coil spring 90 moves smoothly so that the lower surfaces of the upper cooling plates 75A and 75B are positioned on the upper grindstone except for the entry position of the coil spring 90 in the cooling plates 75B and 55A. The grinding surface 20a of the wheel 20 may be slightly below, and the upper surfaces of the lower cooling plates 55A and 55B may be slightly above the grinding surface 21a of the lower grinding wheel 20. By doing so, the dimension between the sliding surfaces of the cooling plate 75A and the cooling plate 55B becomes substantially smaller than the dimension between the grinding surfaces 20a and 21a of the grinding wheels 20 and 21, and is sparked out. Since both ends of the coil spring 90 are pressed by the cooling plates 75A, 75B and 55A, 55B even if the length of 90 becomes the same as the gap width between the grinding surfaces 20a, 21a of the grinding wheels 20, 21, respectively. The coil spring 90 can be cooled more reliably by the cooling plates 75A and 75B and 55A and 55B.

  In the said embodiment, although the workpiece was a coil spring, this invention is not limited to a coil spring, For example, a shaft and a pin may be sufficient. In this case, when both ends of the shaft and pin are ground by the grinding wheel and then pass between the cooling plates, at least one of the cooling plates can be bent in the direction of the grinding wheel axis by an urging member or the like. Good.

  In the above embodiment, the coil spring guide board is a rotary table. However, the coil spring guide board is not limited to the rotary table. For example, the coil spring guide board is a coil spring guide board in which a coil spring holding hole moves on a rectangle. Also good. Further, a coil spring guide board in which the coil spring holding hole is moved in an elliptical shape may be used. In addition, a coil spring guide board in which the coil spring holding hole moves linearly may be used.

  In the second embodiment, the nozzles 80 and 81 are provided in the inter-grinding wheel region R1 between the grinding wheels 20 and 21 so that the cooling medium can be sprayed toward both ends of the coil spring 90. The nozzle 81 is supplied after passing through the flow path of the cooling plates 75A and 75B, and the nozzle 81 is supplied after passing through the flow path of the cooling plates 55A and 55B. You may make it supply from the cooling device provided separately, without letting it pass. The cooling medium supplied to the nozzles 80 and 81 may be different from the cooling medium supplied to the cooling plate.

Although the present invention relates to grinding of both ends, in an object to be ground, it may be necessary to grind only one surface, not both ends. In such a case, in this machine, one grinding wheel may be replaced with a fixed plate having a sliding surface. As another method, the coil spring holding hole 62A provided in the rotary table is made into a hole with a bottom that opens upward, and after the rotation of the rotary table, one end face is ground with the upper grinding wheel 20, Subsequently, the coil spring may be cooled by the upper cooling plates 75A and 75B. In this case, the lower grinding wheel 21 and the lower cooling plates 55A and 55B are not necessary, and the discharging may be performed by adding a take-out means to the coil spring automatic supply means.

The side view of the both ends grinding machine of the coil spring showing an example of this invention AA arrow cross-sectional view of FIG. Detailed view of part D in Fig. 1 BB cross-sectional view of FIG. 1 in Example 1 Side view showing the main parts CC sectional view of FIG. 1 in Example 1 BB cross-sectional view of FIG. CC sectional view of FIG. 1 in Example 2 (A) BB sectional view of FIG. 1 showing another embodiment (b) CC sectional view of FIG. 1 showing another embodiment Main parts of prior art grinding equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coil spring both-end grinding machine 12A, 12B Frame 13A, 13B Movable base part 13R Linear guide 13G Ball screw mechanism 13M Grinding wheel vertical drive motor 14A Upper drive shaft 14B Lower drive shaft 20, 21 Grinding wheel 20a, 21a Grinding surface 20J, 21J Rotating shaft (Whetstone shaft)
R1 Between grinding wheels 46 Spring feeder 50 Coil spring guide board moving mechanism 51 Support bases 55A, 55B Cooling plates 75A, 75B Cooling plate 57 Table rotation drive motor 61 Rotation shaft 62 Rotation table (coil spring guide board)
62A Coil spring holding hole 70A Nut 70B Ball screw 71A Worm shaft 71B Worm wheel 72 Gear box 73 Front plate 78 Handle 90 Coil spring

Claims (8)

In a coil spring both-end grinding machine that processes both ends of the coil spring,
A pair of grinding wheels that rotate together with their end faces facing each other and at least one of which can cut and move in the grinding wheel axis direction;
A coil spring guide board provided with a coil spring holding hole penetrating in the grinding wheel axis direction along the outer periphery;
A coil spring guide board moving mechanism for moving the coil spring guide board back and forth so that the coil spring holding hole is applied to a region between the grinding wheels between the grinding wheels;
The grinding wheel has a sliding surface that is substantially the same as the grinding surface of the grinding wheel, and a flow path that allows a cooling medium to pass therethrough is formed. The grinding wheel is juxtaposed with each other and the sliding surfaces face each other. A cooling plate provided
A cooling device for allowing the cooling medium to pass through the flow path of the cooling plate provided oppositely, and
Both ends of the coil spring, which is held in the coil spring holding hole and moves as the coil spring guide plate moves, are ground while being pressed through the inter-grinding region between the grinding surfaces facing each other of the grinding wheel. After that, the coil spring double-side grinding machine is characterized in that it is cooled while being pressed between the opposing sliding surfaces of the cooling plate.   2. The coil spring according to claim 1, wherein the cooling plate juxtaposed to the grinding wheel capable of being cut and moved in the grinding wheel axis direction can be cut and moved in the grinding wheel axis direction integrally with the grinding wheel. Both-end grinding machine.   The position of the said grinding wheel axial direction can be adjusted with respect to the said grinding wheel, The said cooling plate juxtaposed to the grinding wheel which can be cut and moved to the said grinding wheel axial direction can be adjusted. Coil spring double-side grinding machine.   4. The both ends grinding machine for a coil spring according to claim 1, wherein the cooling medium is supplied to a flow path of the cooling plate after being cooled to a set temperature by a cooling device.   5. The coil spring double-side grinding machine according to claim 1, wherein the cooling medium is liquid or gas.   6. The coil spring double-side grinding machine according to claim 1, further comprising an automatic discharging means for automatically discharging the coil spring after completion of grinding.   7. The coil spring double-side grinding machine according to claim 1, further comprising coil spring automatic supply means for automatically supplying a coil spring before grinding to a coil spring holding hole of the coil spring guide disk.   The both ends grinding of the coil spring of Claim 1 thru | or 7 which provided the nozzle so that the said cooling medium could be injected toward the both ends of the said coil spring in the area | region between the said grinding wheels between the said both grinding wheels. Machine.

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