JP2005088086A - Method and apparatus for working on end surface of tubular article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for working on an end surface of a tubular article which is easy to operate and can surely apply finish-machining in a short time. <P>SOLUTION: A turn of an endless grinding belt 41 with a driven required width is pushed against an end surface of a workpiece 60 held by a workpiece holding means 10 and rotating around the axial line, and the belt is reciprocated widthwise in an appropriate range for grinding. In addition, to carry out such a working method, an apparatus is employed, which includes the workpiece holding means 10 for fixedly holding the workpiece 60 detachably and coaxially on a rotation axis center line (a) for applying rotation driving force to the workpiece 60 around the axial line, a feed means 30 for advancing/retreating a surface to be worked toward the grinding side via the workpiece holding means 10, and a grinding means 40 having the grinding belt 41 driven to rotate oppositely to the means 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an end surface processing method for a cylindrical product suitable for finishing an end surface of an industrial product, which is mainly formed in a cylindrical shape, with an abrasive and a processing apparatus therefor.

  Conventionally, coil springs used in locations subject to relatively large loads, in other words, coil springs made of a material having a large wire diameter, need to have their free long end faces formed on a flat surface perpendicular to the coil axis. Therefore, the coil end portion is slightly deformed from the spiral portion and processed so that both ends are parallel to each other, and both end surfaces of the free length are processed into parallel surfaces with a predetermined dimension.

  Most of the coil spring forming finish processing is to hold a coil spring to be processed into a cylindrical holding body, and to grind the end face using a rotating grindstone.

  Therefore, the current end face processing of coil springs requires a lot of time for preparation work such as mounting work piece to the holding part for grinding, so work efficiency is poor and dimensional accuracy is increased. Is difficult. In particular, in the case of a coil spring made of stainless steel, it is difficult to grind the end face. This is because stainless steel is softer than that made of spring steel during grinding, so clogging of the grindstone is likely to occur. Problems arise. Further, the heating causes elongation of the wire rod, resulting in a distorted dimension. Naturally, the material is changed, which is not preferable. There is also a problem that the dimensional accuracy cannot be increased.

  In addition, when grinding the end face of a coil spring because of grinding using a rotating grindstone, there is inevitably a burr on the edge of the grinding part (the edge left behind in the direction opposite to the grinding surface remains in a folded state). However, it is necessary to perform a secondary process in which this is ground off with a file after grinding. There is also a problem that dust generated during grinding is scattered and the working environment is deteriorated.

  The present invention has been made in order to solve such problems, and provides an end face processing method and processing apparatus for a cylindrical product that can be easily and reliably finished in a short time. It is intended to do.

In order to achieve the above object, a method for processing an end face of a cylindrical product according to the first invention comprises:
Grinding the end surface of the workpiece that is held by the workpiece holding means and rotating around the axis with the endless grinding belt with the required width to drive, and reciprocating in the width direction within an appropriate range It is characterized by processing.

Moreover, the end surface processing method of the cylindrical product according to the second invention is as follows.
Grinding the end surface of the workpiece that is held by the workpiece holding means and rotating around the axis with the endless grinding belt with the required width to drive, and reciprocating in the width direction within an appropriate range At this time, cooling air is blown toward the grinding portion of the workpiece to cool the workpiece and remove grinding debris.

As an apparatus for carrying out the processing method, an end face processing apparatus for a cylindrical product according to the third invention is:
A workpiece holding means adapted to detachably fix and hold the workpiece on the axis of rotation about the axis, and to apply a rotational driving force to the workpiece around the axis, and the work surface to the grinding side via the workpiece holding means It comprises feed means for advancing and retreating, and grinding means comprising a grinding belt that is rotationally driven to face the work holding means.

  In the third aspect of the invention, the work holding means includes a clamper capable of holding the work coaxially from the outer periphery on the axis line at the front end of the rotating shaft supported in a horizontal state, and the rear end of the work is positioned in association with the clamper. It is preferable to have a clamper positioning mechanism (fourth invention).

  In the clamper positioning mechanism according to the third aspect of the present invention, the rotary shaft is hollow, the rear end of the positioning operation shaft arranged through the inside protrudes from the rear end of the rotary shaft, and the operation knob is attached. In addition, a positioning part piece that determines the length of the workpiece is screwed to the screw shaft part in a state where the tip part of the positioning operation shaft is formed on the screw shaft and protrudes forward from the operation base part of the clamper. It is good that it is provided (5th invention).

  The clamper according to the fourth or fifth invention preferably comprises at least three workpiece gripping pieces and is clamped from the periphery according to the outer diameter of the workpiece (sixth invention).

  Further, it is preferable that a workpiece tip support mechanism capable of adjusting the vertical position is provided at a front position where the clamper does not interfere with the workpiece gripping piece tip (seventh invention).

  Further, the feeding means uses a support plate for supporting the work holding means and the work tip support mechanism by means of an actuator along a guide member provided on a base plate arranged on a machine base, and by a grinding belt of the grinding means. It is good to be the structure which slides so that advance / retreat is possible with respect to a grinding part (8th invention).

  Further, a position where a support plate and a base plate for supporting the work holding means including the feeding means and the work tip support mechanism are opposed to the grinding means for facilitating attachment / detachment of the work with respect to the work holding means on the machine base. It is good to be comprised so that movement to the side is possible (9th invention).

  In the third aspect of the invention, a cooling nozzle that blows air toward the grinding portion is disposed above the grinding portion where the workpiece is ground by the grinding means, and a container that receives grinding waste is disposed immediately below the cooling nozzle. It is preferable that it is the structure (10th invention).

  According to the first invention, when grinding the end face of the cylindrical article (work), the endless grinding belt turns the end face in the circumferential direction while holding the work and rotating it around the axis. Grinding with the grinding belt can be effectively performed by pressing the portion and grinding. In other words, since the grinding belt that runs endlessly grinds the ring-shaped workpiece machining surface without touching the whole, it reduces cutting resistance and prevents chips from adhering to the abrasive grains. It is processed and can be processed efficiently with full use of the grinding function. In addition, by grinding while reciprocating the grinding belt in the width direction and rotating the workpiece around the axis, it is possible to accurately grind the processed surface and increase the dimensional accuracy.

  According to the second invention, in addition to the effect of the first invention, by blowing air to the grinding part, the workpiece is heated by frictional heat caused by grinding to prevent an increase in the temperature of the part adjacent to the grinding part. It is possible to prevent thermal distortion from occurring. At the same time, air is blown downward against the grinding part to prevent grinding dust from scattering, and if a receiving container is placed at the bottom, the grinding waste can be recovered and the work environment can be improved. Play.

  According to the third aspect of the invention, since it is configured to be suitable for carrying out the end face processing method for a cylindrical product of the first aspect, the same effects as in the first aspect can be exhibited.

  According to the fourth invention, in order to hold the cylindrical article, the workpiece is gripped on the outer periphery by the clamper provided at the tip of the rotating shaft that rotates in a horizontal state, and is held coaxially with the rotating shaft. Since the length dimension of the rear end of the workpiece held by the clamper can be set by the positioning mechanism, the workpiece length in grinding by the grinding means can be finished correctly by determining the feed dimension.

  According to the fifth aspect of the invention, the positioning mechanism that determines the finish length dimension of the workpiece rotates the operation shaft by the operation knob on the rear end side of the operation shaft that is inserted using the inside of the rotation shaft that supports the clamper. Since the positioning piece that is screwed on the distal end side can be set by advancing and retreating in the clamper, there is an advantage that the setting can be easily performed by a simple operation.

  According to the sixth aspect of the invention, since the work gripping piece of the clamper is gripped from the periphery in accordance with the outer diameter of the work, it can be freely gripped even when the work has different outer diameters. There is an advantage that the diameter can be changed.

  Further, according to the seventh invention, by arranging the tip support mechanism that can support the workpiece from the lower side in front of the workpiece clamper position, a downward external force acts on the workpiece during grinding by the grinding belt. Since the rotation of the workpiece is received without being hindered, the grinding surface can be finished at a right angle to the axis, and the dimensional accuracy can be improved.

  According to the eighth aspect of the invention, since the workpiece can be held and rotated, and the tip of the workpiece can be properly held and fed to the grinding portion by the actuator, so that the operation can be automated. If it carries out, there exists an effect that work efficiency can be improved remarkably.

  Furthermore, according to the ninth invention, since the support plate and the base plate on which the workpiece holding means and the workpiece tip support mechanism are mounted can move laterally from the grinding position of the workpiece with respect to the grinding means on the machine base, This makes it possible to facilitate the work of attaching and detaching the workpieces, improving the workability, and improving the work efficiency other than the machining operation when machining a large number of workpieces.

  According to the tenth aspect of the invention, the cooling air is blown downward from the upper side to the grinding part where the workpiece is ground, and the receiving container for the grinding waste is disposed at the lower side, the same as in the second aspect of the invention. The effect of can be demonstrated.

  Next, the cylindrical product end face machining method according to the first invention and the second invention will be described with reference to the drawings with respect to a specific embodiment of the cylindrical product end face machining apparatus according to the third invention. explain.

  FIG. 1 is a front view showing an embodiment of an end face processing apparatus for a cylindrical product, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a longitudinal sectional view (a) showing a workpiece holding means and A- FIG. 4A is a front view (a) and a plan view (b) of the workpiece tip support mechanism. FIG. 5 is a plan view (a) and a side view of the workpiece attachment / detachment position moving means. FIG. 6 shows a side view (a) of the traversing mechanism of the grinding means and a plan view (b) of the principal part thereof, and FIG. 7 shows a perspective view of the principal part of one specific example of the grinding belt. ing.

  This cylindrical end surface processing apparatus 1 (hereinafter referred to as a workpiece end surface processing apparatus 1) is used to finish a free-length end surface of a coil spring to a required dimension. Therefore, the work refers to a coil spring.

  A workpiece end surface processing apparatus 1 according to the present embodiment includes a machine base 2 having a frame structure with required dimensions, a holding means 10 for a workpiece 60 and a feeding means 30 for the workpiece 60 arranged opposite to each other on the machine base 2, and a workpiece holding means. 10 and a grinding means 40 mainly composed of a grinding belt 41 arranged opposite to 10.

  First, the machine base 2 is formed by being divided into a support part 3 on which the work holding means 10 (hereinafter referred to as the work holding means 10) and the feeding means 30 are mounted, and a support part 4 on which the grinding means 40 is mounted. The height of the support surface is set so that the rotation axis of the grinding belt 41 in the grinding means 40 and the axis of the work 60 held by the work holding means 10 are at the same level, and the frame structure It is formed by.

  Next, the work holding means 10 is disposed on a support plate 11 provided via a feed means 30 on the work holding means support portion 3 of the machine base 2 above the base plate 5 that is rotatably arranged. Has been. The workpiece holding means 10 includes a rotating shaft 14 that is horizontally supported by bearings 13 and 13 via two cradles 12 on the support plate 11 and is rotatable by motor drive, and a tip of the rotating shaft 14. Of the grinding means 40 that is opposed to the clamper 15 (chuck having at least three gripping pieces) that grips the workpiece 60 that is attached to the workpiece 60, with the axis of the workpiece 60 (coil spring) aligned with the rotational axis a. The end face is processed by the grinding belt 41.

  The clamper 15 is arranged with at least three long-sized grip pieces 15a equally divided in the rotation direction on the opposite side (front) of the support plate from the face plate incorporating a well-structured expansion / contraction mechanism. 15a has a structure in which the outer periphery of the workpiece 60 is gripped by moving in the radial direction or the opposite direction from the axis by the expansion / contraction mechanism. In addition, the gripping piece 15a is configured such that a portion having a required length inside the tip portion 15a 'contacts the work 60 and substantially applies a holding force.

  The rotary shaft 14 is a hollow shaft, and the above-described clamper 15 is fixed to the front end of the rotary shaft 14 at the same axis, and a pulley 18 to which power is transmitted from a motor 16 by a belt 17 is attached to a rear end portion. The hole formed along the axis of the rotary shaft 14 is a stepped hole 14a having a hole diameter increased from the intermediate position toward the distal end, and the positioning operation shaft 19 passes through the hole and rotates. Embedded as possible. The positioning operation shaft 19 has a middle portion with a diameter that fits into a thicker diameter portion of the stepped hole 14a of the rotary shaft 14, a front portion is a screw shaft 19a, and a rear portion is smaller in diameter than the middle portion, The rear end of the intermediate portion is brought into contact with the stepped portion of the stepped hole 14a, and the rear portion of the shaft protrudes rearward from the rear end of the rotary shaft 14 and is prevented from coming off by the stop collar 20, and is attached to the rear end. A knob 21 for rotating operation is attached. Further, the screw shaft portion 19a of the positioning operation shaft 19 is projected to the shaft center within a range shorter than the tip of the gripping piece 15a of the clamper 15, and the screw shaft portion 19a is formed on the central boss 23a of the positioning portion piece 23. The screw hole 23b is screwed. The drive motor 16 for the rotary shaft 14 is mounted on a motor base 16 ′ attached to the side of the support plate 11.

  The positioning portion piece 23 is configured such that a receiving piece 23c is interposed between each holding piece 15a of the clamper 15 (in this embodiment, three holding pieces 15a are arranged). The receiving piece 23c is radially divided from the central boss 23a, and a screw hole 23b is provided in the boss 23a so that the screw shaft portion 19a of the positioning operation shaft 19 is screwed. ing. The positioning part piece 23 set in this way sets the rear end position of the work 60 gripped by the gripping piece 15a of the clamper 15, and by rotating the positioning operation shaft 19 by gripping the knob 21 at the rear end. Since the movement in the rotational direction is prevented by the gripping pieces 15a of the clamper 15, the workpiece 60 is held by the clamper 15 by moving back and forth in the axial direction by the action of the screw shaft portion 19a and the screw hole 23b of the boss 23a. The rear end can be set.

  Further, a workpiece tip support mechanism 25 that can adjust the vertical position is disposed on the support plate 11 at the front lower position of the clamper 15 described above. As shown in FIGS. 4 (a) and 4 (b), the workpiece tip support mechanism 25 is a roller that rotatably supports two rollers 27, 27 with their axes parallel to each other at a predetermined interval. A support bracket 26 and the roller support bracket 26 are arranged at a position directly below the rotation axis a of the clamper 15 in a direction perpendicular to the direction of the rotation axis a, so that the roller 27 rotates the rotation axis. The height adjustment member 28 is supported so as to be equally disposed on both sides immediately below the core line a, and the two guide members 29 are used to maintain the posture of the roller support bracket 26.

  The height adjusting member 28 is a screw shaft body that is inserted through an attachment hole 28b provided in the support board 11 so as to protrude upward from the lower surface, and a knob 28a for rotation operation is fixed to the lower end. This portion is screwed into a screw hole 26a formed in the vertical direction at the center portion of the roller support bracket 26, and the roller support bracket 26 is supported in a vertically movable manner. Further, the guide member 29 is disposed at both sides of the height adjusting member 28 at a required interval, and the upper end is fixed to the lower portion of the roller support bracket 26 so as to be provided in the support plate 11. 29a is inserted.

  The feed means 30 is supported by two guide shafts 32, 32 horizontally disposed on the base plate 5 and supported by brackets 31, 31 'standing upright at a predetermined interval in parallel with the movement axis. The end of the rod 34a is fixed to the bracket 31 'on the rear side, and the sliders 33, 33 fixedly attached to the lower surface of the support plate 11 and slidingly fitted on the guide shafts 32, 32. And an air cylinder 34 (corresponding to the actuator of the present invention) provided on the support plate 11 side. Two sliders 33 are provided at the front and rear of the guide shafts 32 at a required interval. Reference numeral 39 in the figure denotes a spring that facilitates a return operation after stopping feeding.

  Further, a workpiece attaching / detaching position moving means 35 for moving the workpiece holding means 10 when attaching / detaching the workpiece 60 to / from the clamper 15 is provided below the base plate 5. The workpiece attaching / detaching position moving means 35 is a turning support portion provided on the work holding means supporting portion 3 of the machine base 2, and a turning shaft 36 whose base end is fixed to the center of the base plate 5 is used to hold the work of the machine base 2. A lower end of the means support portion 3 is supported by a boss 3a so as to be pivotable. A distal end portion of a swivel arm 37 whose base end is fixed to the swivel shaft 36, and a base end of the support portion 3 below the plate 3b. The end of the rod 38a of the air cylinder 38 pivoted on the side is connected to a pin 38c by a fork piece 38b, and the work holding means 10 is rotated about 40 ° laterally from the grinding work position by the operation of the air cylinder 38. It can be displaced (indicated by a two-dot chain line b in FIG. 2).

  On the other hand, the grinding means 40 is opposed to the workpiece 60 held by the workpiece holding means 10 on the grinding means support portion 4 of the machine base 2, and the rotation axis center line a of the workpiece holding means 10 and the grinding belt. A grinding belt support frame 42 that supports the grinding belt 41 (hereinafter simply referred to as a support frame 42) and a side surface of the support frame 42 are arranged at a predetermined interval so that the traveling rotational axis c of 41 matches. A grinding belt 41 wound around and driven by a belt support mechanism 43 composed of two belt pulleys 43a and 43b, and the support frame 42 in a lateral direction perpendicular to the rotational axis a of the work holding means 10 as appropriate. The traverse mechanism 50 is configured to reciprocate by an amount.

  The support frame 42 includes a base portion 42a formed in a horizontal state and a support plate 42b standing upright on the base portion 42a. A belt support mechanism 43 (two belt pulleys 43) is provided on one side of the support plate 42b. , 43 '). A traversing mechanism 50 is provided below the base portion 42a.

  The belt support mechanism 43 includes a drive shaft 44 that is supported by the support plate 42b so as to be laterally rotatable by a bearing 44a, and a driven shaft 46 that is laterally movable and can be moved back and forth by a take-up 45 at a required distance. Flat pulleys 43a and 43b each having a required diameter are attached, and an endless grinding belt 41 is installed around the pulleys 43a and 43b. The drive shaft 44 is on the opposite side of the support plate 42b from the grinding belt wrapping portion, and from the drive pulley 47a on the output shaft of the reduction motor 46 attached to the motor base 46a to the pulley 47b on the drive shaft 44. A belt 48 is wound around and power is transmitted. Further, the take-up 45 that keeps the tension of the grinding belt 41 in a steady state has a function of urging the support bearing portion 45a of the driven shaft 46 so as to have a steady tension by the thrust of the air cylinder 45b. A protective cover 49 is attached to the support plate 42b on the upper side of the stretched portion of the grinding belt 41 in order to prevent grinding dust from scattering and to ensure safety.

  The grinding belt 41 used here is, for example, as shown in FIG. 7, on a belt base material 41a formed in an endless shape as known in Japanese Patent Laid-Open No. 2003-11069. A large number of grinding part pieces 41b each having a required size formed by attaching countless abrasive grains to the surface are fixed on the base side, and the end parts 41c are exposed by wrapping the numerous grinding part pieces 41b. What is grinded is used. The grinding belt 41 functions so that the gap 41d generated by the end 41c of the grinding piece 41b during grinding is useful for removing grinding debris.

  A traversing mechanism 50 is provided between the base portion 42 a of the support frame 42 of the grinding means 40 having such a configuration and the support portion 4 of the machine base 2. The traversing mechanism 50 includes rails 51, 51 arranged on the upper surface of the support base 4 (support part 4) at a predetermined distance from the center in a direction orthogonal to the traveling direction of the grinding belt 41, and forward and backward. Sliders 52, 52 provided on the lower surface of the base portion 42a of the support frame 42 are slidable to be slidable in the lateral direction. Then, the output shaft 53a of the reduction motor 53 attached to the lower surface of the top plate 4a of the support base 4 is protruded upward, and the rotating disk 54 is attached to the protruding end of the output shaft 53a. A rod 56 whose base end is pivotally supported by a pivot shaft pin 55 suspended from the lower surface of the base portion 42a on a line parallel to the rail portions 51, 51 through the axial center of the rod portion, and a distal end portion of the rod 56 Is connected to a pin 57 provided near the outer periphery of the rotating disk 54 so that the crank frame is moved, so that the support frame 42 is reciprocated for one stroke of the crank movement by one rotation of the rotating disk 54. Yes.

  The air cylinder 34 of the feeding means 30 attached to the workpiece holding means 10 side, the air cylinder 38 of the workpiece attaching / detaching position moving means 35, and the take-up air cylinder 45b on the grinding means 40 side are well-known not shown. In the air supply unit, air supply / stop operation is performed based on a program preset by the control means. Also, it is preferable that the control of the entire apparatus can be operated based on a program.

  Further, a cooling air jet nozzle 65 (main) is provided above the grinding part A where the work 60 supported by the clamper 15 in the work holding means 10 is ground on the end face by the grinding belt 41 of the grinding means 40. (Corresponding to the cooling nozzle of the invention) is arranged with the ejection port facing downward. The cooling air jet nozzle 65 is connected to a separately installed compressor 66 or an air pipe 67 branched from the factory line air so that the cooling air can be blown to the grinding part A. Further, a receiving container 70 having a size that can be placed on the machine base 2 is disposed directly below the grinding part A so as to receive grinding waste generated in the grinding part by blowing the cooling air. Reference numeral 68 in the figure denotes an air piping open / close valve.

  In order to machine the end face of the work 60 (coil spring) using the work end face machining apparatus 1 of the present embodiment configured as described above, the work 60 is first held by the clamper 15 of the work holding means 10.

  In order to mount the workpiece 60 on the clamper 15, prior to that, the positioning operation shaft 19 is operated according to the free length based on the outer dimensions of the workpiece 60 to set the positioning portion 23 in and out. In order to move the positioning portion piece 23, the positioning operation piece 19 is moved back and forth by screwing the positioning shaft 23 into the screw shaft portion 19a by rotating the knob 21 at the rear end. The length protruding forward from 15 is set. In other words, the grinding amount is set according to the free length of the coil spring (workpiece 60).

  Next, the work 60 is loaded in the space surrounded by the gripping pieces 15a of the clamper 15 in the open state with the surface to be ground facing forward (grinding side). Thereafter, the gripping piece 15a is moved inward by operating the expansion / contraction mechanism of the clamper 15, and the work 60 is clamped from the outside. At this time, each gripping piece 15a moves in conjunction with each other, so that its axis can be automatically matched with the rotation axis a. When the workpiece 60 is held by the clamper 15 in this way, the two rollers 27 and 27 supported by the roller support bracket 26 are operated by rotating the knob 28a of the workpiece tip receiving mechanism 25 arranged at the front lower portion thereof. Is set in a state of receiving the outer periphery of the tip end of the workpiece 60 held by the clamper 15. At this time, if the positions of the two rollers 27 and 27 are too high, the tip of the workpiece 60 is not correctly positioned. Therefore, the roller 27 is set to rotate while lightly supporting the outer periphery of the workpiece 60 during rotation. Is preferred.

  When the setting preparation is completed, when the motor 16 on the workpiece holding means 10 side is activated and the rotating shaft 14 is rotated, the workpiece 60 is rotated together with the clamper 15. On the other hand, in the grinding means 40, each grinding part 41b of the grinding belt 41 is driven so as to contact the exposed end part 41c with the surface of the work 60 so as to be hammered. The motor 46 in the grinding means 40 is activated to drive the grinding belt 41. At the same time, the air cylinder 45b of the take-up 45 is operated so that the grinding belt 41 is driven in a tensioned state, and the motor 53 of the traversing mechanism 50 is started to activate the rotating disk 54 and the swinging rod 56. In the crank motion, the support frame 42 is guided by the rails 51 and 51 and reciprocates appropriately in the lateral direction. Further, the cooling air is supplied from the compressor 66 to the jet nozzle 65 by opening the valve 68 and blown toward the grinding part A.

  In such a state, the feeding means 30 on the work holding means 10 side is operated, and the air cylinder 34 is moved forward from the standby position. When the air cylinder 34 moves forward (air is supplied to the piston rod 34 a side of the air cylinder 34), the support plate 11 moves forward while being guided by the guide shaft 32 via the slider 33. The workpiece 60 held by the clamper 15 of the workpiece holding means 10 to be attached is ground in contact with the top end portion (turn portion) of the portion supported by the driving pulley 43a of the rotating grinding belt 41.

  In the grinding part A, the workpiece 60 is rotated around the axis line at a required speed while being clamped by the clamper 15, and the grinding belt 41 travels along the peripheral surface of the drive pulley 43a at the required speed in the lateral direction. In this state, the end surface of the workpiece 60 comes into contact with the grinding surface of the grinding belt 41. Moreover, since the center (rotation axis a) of the workpiece 60 and the drive pulley 43a axis c (see FIG. 1) of the grinding belt 41 are supported so as to be positioned on the same plane, Grinding is performed while the contact portion of the grinding belt 41 is in contact with the end face in a state of being horizontally traversed and the grinding belt 41 reciprocates in the width direction by the function of the traversing mechanism 50. Even if the processed surface is cylindrical, it can be finished to a flat surface orthogonal to the axis. At this time, the contact force of the workpiece 60 against the grinding surface of the grinding belt 41 is given by the propulsion force of the air cylinder 34 in the feeding means 30.

  Further, at the grinding position, the rotating workpiece 60 holds the tip of the workpiece 60 in a steady position while maintaining the tip of the workpiece 60 from below with the rollers 27 and 27 of the workpiece tip support mechanism 25. Therefore, even if a downward force acts on the end surface of the workpiece 60 due to the rotation of the grinding belt 41 (the grinding surface of the grinding belt moves downward), the end surface is orthogonal to the rotation axis a. The state can be maintained and the machined surface can be finished correctly.

  Further, in this grinding part A, while the end face of the workpiece 60 is ground by the grinding belt 41 as described above, the cooling air is blown from the cooling air jet nozzle 65 disposed above the workpiece 60. The work end surface of the work 60 accompanying grinding is cooled by contact friction with the grinding surface of the grinding belt 41, so that the end of the work is heated and the phenomenon of seizure is prevented. Further, since the filaments are prevented from extending due to thermal expansion due to heating, the processing accuracy is not lowered and the finished value can be achieved. Therefore, there is no occurrence of burring because there is no deterioration in quality or deviation in finishing dimensions, and in addition, grinding can be performed accurately. Further, since the grinding belt 41 is also cooled together with the workpiece 60 by the cooling air in the grinding part A, the degree of wear of the grinding belt 41 that is circulated and driven by the cooling effect is reduced, and a preferable result is obtained. Become.

  Generally, since the cutting amount of the end surface of the workpiece 60 (coil spring) is relatively small, the amount of movement in the grinding portion driven by the feeding means 30 is set in advance with a limit switch ( (Not shown) can be provided and regulated. By avoiding excessive cutting in this way and finishing in a short time, the cooling operation can avoid heat generation during grinding and finish with high efficiency without causing deterioration in quality. .

  In addition, if the above-described grinding belt 41 is used, the chip generated during grinding is ground without causing clogging by a function of discharging the chips to the outside by the gap 41d formed between the tip portions 41c of the grinding piece 41b. Since it can do, it can process at a high grinding speed and a favorable result is obtained. In addition, during the grinding process, the cooling air is blown onto the grinding part as described above, so that all the chips generated by grinding are blown off and received in the receiving container 70 disposed immediately below the grinding part A. And can be recovered. Therefore, it does not scatter around and is useful for improving the working environment.

  When the grinding operation is finished, the feed means is quickly reversed (the supply of pressurized air to the air cylinder 34 is switched to the cylinder head side), and the support plate 11 is moved backward to move the workpiece 60 from the grinding portion to the standby position. Pull back. Thereafter, when the drive of the rotary shaft 14 is stopped and the air cylinder 38 of the work attachment / detachment position moving means 35 is operated to turn the base plate 5 or more around the turning shaft 36 at a predetermined angle, the work holding means 10 on the support plate 11 is obtained. And the workpiece 60 held by the clamper 15 moves to a position laterally away from the grinding portion (see the two-dot chain line b in FIG. 2). Therefore, when the clamp by the clamper 15 is released, the workpiece 60 can be quickly taken out.

  When only one end surface of the workpiece 60 is machined, the workpiece 60 is changed in direction and clamped by the clamper 15 with the unmachined portion at the tip side, and the workpiece attachment / detachment position moving means 35 is reversed. It may be actuated to return to the standby position, and thereafter it may be advanced to the grinding position and ground in the manner described above. When one side has been machined, the limit position setting may be changed so that the forward stop position of the workpiece 60 moves by the machining allowance.

  The cooling air is supplied in conjunction with the work 60 attachment / detachment operation in the work attachment / detachment position moving means 35 (the work attachment / detachment position moving means 35 is turned to move from the grinding work position to the attachment / detachment position). If the valve 68 in the air pipe 67 is operated by the controller so as to stop the supply, the amount of air used can be saved.

  As described above, according to the present embodiment, even an end surface of an article forming a cylindrical body such as a coil spring can be accurately processed into a flat surface with a simple operation. Since it can be finished in a short time and can be processed without generating a large amount of heat, it can be effectively processed without deteriorating the quality of the processed surface. Further, the accuracy of the finished surface can be further improved by mounting the workpiece with the clamper and simultaneously supporting the tip portion against the cutting load accompanying the movement of the grinding body.

  Therefore, although the end face processing of the coil spring has been described in the description of the above embodiment, it is needless to say that the end face finishing of other pipe-shaped articles can be used. As for the grinding belt, the one having the above-described configuration is most preferable, but the present invention is not limited to this, and any other structure having a chip removal function can be used. . Therefore, the grinding belt is not limited to that of the above embodiment. In the embodiment, an air cylinder is used, but it goes without saying that an electric cylinder or a hydraulic cylinder can be used instead. Furthermore, in the above description, the case where air is sprayed toward the grinding part to perform grinding has been described, but it is also possible to work without performing the air spraying operation as necessary.

Front view showing an embodiment of an end surface processing apparatus for a cylindrical product Plan view of FIG. Longitudinal sectional view (a) and AA view (b) showing work holding means Front view (a) and plan view (b) of workpiece tip support mechanism Plan view (a) and side view (b) of workpiece attachment / detachment position moving means Side view of the traversing mechanism of the grinding means (a) and plan view of the main part (b) Perspective view of the principal part of a specific example of the position of the grinding belt

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Workpiece end surface processing apparatus 2 Machine stand 3 Work holding means support part 4 Support part of grinding means 10 Work holding means 11 Support board 14 Rotating shaft 15 Clamper 16, 46 Motor 19 Positioning operation shaft 19a Screw shaft part 21 Knob 23 Positioning part piece 25 Workpiece tip support mechanism 30 Feed means 32 Guide shaft 33 Slider 34, 38, 45b Air cylinder 35 Workpiece attachment / detachment position moving means 36 Rotating shaft 37 Rotating arm 38b Fork piece 40 Grinding means 41 Grinding belt 42 Support frame 43 Belt support mechanism 43a 43b Belt pulley 45 Take-up 50 Traverse mechanism 51 Rail section 52 Slider 54 Rotating disk 56 Rod 57 Pin 60 Workpiece (coil spring)
65 Cooling air ejection nozzle 66 Compressor 70 Grinding waste receptacle

Claims (10)

  Grinding the end surface of the workpiece that is held by the workpiece holding means and rotating around the axis with the endless grinding belt with the required width to drive, and reciprocating in the width direction within an appropriate range An end face processing method for a cylindrical product, characterized by processing.   Grinding the end surface of the workpiece that is held by the workpiece holding means and rotating around the axis with the endless grinding belt with the required width to drive, and reciprocating in the width direction within an appropriate range In this case, a method for processing an end face of a cylindrical product is characterized in that cooling air is blown toward the grinding portion of the workpiece to cool the workpiece and remove grinding debris.   A workpiece holding means adapted to detachably fix and hold the workpiece on the axis of rotation about the axis, and to apply a rotational driving force to the workpiece around the axis, and the work surface to the grinding side via the workpiece holding means An end face machining apparatus for a cylindrical product, comprising: a feeding means for advancing and retreating; and a grinding means including a grinding belt that is rotationally driven to face the work holding means.   The workpiece holding means includes a clamper that can hold the workpiece coaxially from the outer periphery on the axis of the rotating shaft that is supported in a horizontal state, and a clamper positioning mechanism that positions the rear end of the workpiece in association with the clamper The end surface processing apparatus of the cylindrical article of Claim 3 which has these.   The positioning mechanism of the clamper has an operation knob attached to the rotating shaft, the rotating shaft being hollow, the rear end of the positioning operating shaft arranged through the inside protruding from the rear end of the rotating shaft, and A configuration in which a positioning portion piece for determining the length of a workpiece is screwed to the screw shaft portion in a state where the tip end portion of the positioning operation shaft is formed on the screw shaft and protrudes forward from the operation base portion of the clamper. The end face processing apparatus for a cylindrical product according to claim 4.   6. The end face processing apparatus for a cylindrical product according to claim 4, wherein the clamper includes at least three workpiece gripping pieces and is clamped from the periphery according to the outer diameter of the workpiece.   The end surface processing apparatus for a cylindrical product according to claim 4, wherein a work tip support mechanism capable of adjusting a vertical position is provided at a front portion position that does not interfere with a work gripping piece tip of the clamper.   The feeding means is a grinding part by means of a grinding belt of the grinding means by means of an actuator along a guide member provided on a base plate arranged on a machine base with a support plate supporting the work holding means and the work tip support mechanism. The end surface processing apparatus for a cylindrical product according to claim 3, wherein the end surface processing apparatus is configured to slide forward and backward.   A support plate and a base plate for supporting the work holding means including the feeding means and the work tip support mechanism are located on a side from a position facing the grinding means to facilitate attachment / detachment of the work with respect to the work holding means on the machine base. The end surface processing apparatus of the cylindrical article of Claim 3 comprised so that a movement to the direction was possible.   The cooling nozzle that blows air toward the grinding part is disposed above the grinding part where the workpiece is ground by the grinding means, and a container that receives grinding waste is disposed immediately below the cooling nozzle. The end surface processing apparatus of the cylindrical goods as described in.

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