JP2005349524A - Lapping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lapping method and a lapping device by which a working face of a workpiece can be formed into a crowning shape in a short period of time when working it using a lapping film, the service lifetime of a shoe and that of the lapping film can be improved, and equipment expenses can be reduced. <P>SOLUTION: The lapping device 1 has a long belt-like lapping film 11, which covers the working face of an arcuate workpiece W incompletely round in cross section and in which abrasive grains are provided all over the thin-walled base material, a rotational driving means 40 for rotationally driving the workpiece W, an oscillation means 50 for axially oscillating the workpiece W, and a shoe means 70 which is provided to the back face side of the lapping film 11 and presses the abrasive grain face of the lapping film 11 to the working face of the workpiece W. The shoe provided to the back face side of the lapping film 11 is composed of a plurality of roller-shaped shoes 71 and rotatably held to a shoe holder 80 in the shoe means 70. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lapping apparatus that performs film lapping (hereinafter simply referred to as lapping) on a work surface of a workpiece with a lapping film with abrasive grains.

  For example, when finishing a workpiece having an outer peripheral surface with a circular arc cross section, such as a cam lobe portion or journal portion of a camshaft, which is an engine part of a vehicle, or a journal portion or pin portion of a crankshaft, recently, it is necessary to grind the entire surface. Wrapping is performed using a long wrapping film in the form of a belt provided with grains.

  In this lapping process, the work surface of the work is covered with a wrapping film, and pressure is applied from the back side by a shoe placed opposite to the work. The work is rotated while the wrapping film is pressed against the work, and the work is oscillated in the axial direction. (Vibration) is a superfinishing process in which a workpiece is processed with the abrasive surface of the wrapping film (see, for example, Patent Document 1).

  In such lapping processing, after a predetermined number of workpieces are processed, the wrapping film is fed to a new portion and processed.

  However, since the shoe presses the wrapping film with a predetermined force so that the wrapping film is not displaced from the workpiece, the tip, which is the same location, is always in contact with the wrapping film, and the wrapping film and shoe In order to prevent slipping between the wrapping film and the wrapping film, an anti-slip process is applied to the back side of the wrapping film.

  As a result, even if the shoe is processed to some extent, the shape changes due to wear or the like, the pressing force of the film fluctuates, and the processing uniformity cannot be maintained, so the shoe must be replaced with considerable frequency. In addition, the shoe replacement operation is not only troublesome, but the lapping process is interrupted during that time, so that the operating rate of the apparatus is lowered and the production efficiency may be lowered.

  Further, the tip portion of the shoe may have an arc-shaped cross section in a direction perpendicular to the rotation axis of the workpiece. For example, when the workpiece is a cam lobe part, in order to improve engine performance, the peripheral surface of the cam lobe part may be formed in a middle convex shape having an arc shape in the axial direction. When forming such a workpiece, the shape of the tip of the shoe is an arc-shaped concave corresponding to the convex shape of the workpiece, and the peripheral surface of the cam lobe is molded into a convex shape following the shoe shape. ing.

  However, if a shoe having a concave shape is used, the outer edge of the wrapping film is subjected to an excessive surface pressure than the edge of the workpiece that reciprocates during oscillation.

As a result, abrasion and peeling of abrasive grains occur in the wrapping film, and a larger load is applied to the shoe. The shoe is subjected to wear due to rubbing against the wrapping film and deformation due to the load, resulting in a predetermined concave shape over a long period of time. Cannot be maintained, the work surface roughness deteriorates, the shoe life decreases, the replacement frequency increases, and the cost is disadvantageous.
Japanese Patent Laid-Open No. 7-237116 (see FIGS. 1 and 2)

  The present invention has been made in order to solve the problems associated with the above-described conventional technology, and when lapping is performed using a lapping film, the shoe is prevented from being deteriorated, and the workability of the lapping process and the operation rate of the apparatus are reduced. It is an object of the present invention to provide a lapping apparatus that can prevent production and increase production efficiency.

  A lapping apparatus according to the present invention that achieves the above object includes a long belt-shaped lapping film that covers a machining surface of a work having an arc shape with a non-circular cross section and is provided with abrasive grains on one surface of a thin substrate. A rotation driving means for rotationally driving the workpiece; an oscillation means for oscillating the workpiece in the axial direction; and a polishing grain surface of the wrapping film on the processing surface of the workpiece. And a shoe means for pressing, wherein the shoe means comprises a plurality of roller-like shoes provided on the back side of the wrapping film, and the roller shoes are used as shoe holders. It is characterized by being held rotatably.

  According to the present invention configured as described above, since the roller shoe rotates as the wrapping film is fed, the circumferential position of the roller shoe that presses the wrapping film against the processing surface of the workpiece changes during processing, and the shoe Wear and deformation can be suppressed, the shoe replacement frequency can be reduced, and the cost can be reduced. Further, since the shoe has a simple roller shape, it is easy to create the shoe, which is advantageous in terms of manufacturing cost.

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

  1 is a schematic view of a lapping apparatus according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing a closed state of the upper and lower arms of the lapping apparatus, and FIG. 3 is a schematic cross-sectional view showing an open state of the upper and lower arms. FIG. 4A is a perspective view showing a camshaft as an example of a workpiece to be lapped, and FIG. 4B is an explanatory view of each part of the cam lobe portion of the camshaft. For convenience of explanation, the axial direction (left-right direction in FIG. 1) of the camshaft 60 is the X direction, and the horizontal direction orthogonal to the X direction (the direction orthogonal to the paper surface in FIG. 1) is the Y direction and X direction. A vertical direction (vertical direction in FIG. 1) perpendicular to the Z direction is defined as a Z direction.

  1 to 3, a lapping apparatus 1 generally includes a wrapping film 11 in which abrasive grains are provided on one surface of a thin base material, and an abrasive grain surface of the wrapping film 11 disposed on the back side of the wrapping film 11. The wrapping film is provided on the processing surface of the rotating workpiece W, including a shoe means 70 that presses against the W, a rotation driving unit 40 that rotationally drives the workpiece W, and an oscillation unit 50 that oscillates the workpiece W in the axial direction. 11 is pressed and lapping is performed.

As the workpiece W, for example, the cam shaft 60 shown in FIG. 4A can be cited, and the cam lobe portion 61 of the cam shaft 60 serves as a machining surface. As shown in FIG. 4B, the cam lobe portion 61 generally has a substantially oval non-circular arc-shaped peripheral surface, and defines a base portion d forming a base circle and a cam lift. The top part a, continuous on both sides of the top part a, the event part b ₁ , b ₂ that starts opening or closing the valve of the engine, and the ramp that approaches the event part b ₁ , b ₂ from the base part d A plurality of portions c ₁ and c ₂ are provided, and the radius from the axis O (rotation center) to the machining surface changes for each portion.

Although the base portion d has a constant radius of curvature, the event portions b ₁ and b ₂ are almost linear, so the radius of curvature is very large, and the top portion a has a relatively small radius of curvature. For this reason, in the cam lobe part 61, the frictional force is generated most at the top part a, and therefore the top part a may be essentially a crowning shape (medium convex shape).

  Here, the “circular arc shape with a non-circular cross section” refers to an arc shape in which the radius from the rotation center to one part is different from the radius to the other part, such as an elliptical shape or the cam lobe portion 61 shown in the figure. Of course, an egg shape is included, but the outer shape is circular but the center of rotation is eccentric from the center of the circle.

Further, the lapping apparatus 1 will be described in detail. In FIG. 1, the rotary drive unit 40 includes a head stock 42 that rotatably supports a main shaft 41, a chuck 43 that is provided at the tip of the main shaft 41 and grips one end of a camshaft 60 that is a workpiece W, and a main shaft 41. a spindle motor M ₁ which is connected via a belt 44, and a tailstock 46 provided with a center 45 for supporting the other end of the camshaft 60.

Camshaft 60, the rotation of the spindle motor M ₁ is transmitted through the belt 44 and the main shaft 41, by changing the rotational speed of the spindle motor M _1, the workpiece rotational speed is set to the desired speed, the workpiece during machining The rotational position of W is detected by a rotary encoder S ₁ attached to the main shaft 41. The head stock 42 and the tail stock 46 are respectively provided on tables 47 and 48 that are slidable along the Y direction. The tables 47 and 48 are placed on a table 49 that is slidable along the X direction. Has been.

Spring oscillation unit 50 includes an eccentric rotary body 51 abuts against the end face of the table 49, and the motor M ₂ for oscillation for rotationally driving the eccentric rotor 51, to constantly abut the end face of the table 49 to the eccentric rotor 51 And elastic means 52 such as

The oscillation speed Vo is set to a desired speed (for example, 10 Hz) by changing the rotational speed of the motor M ₂ , and the amplitude is set to the eccentric amount of the eccentric rotating body 51 with respect to the axis of the oscillation motor M _2. Set based on. In this embodiment, the amount of eccentricity is about 1 mm, and the amplitude of oscillation is about 2 mm. For adjusting the eccentric amount of the eccentric rotating body 51, for example, known means such as changing the number of inserted adjustment plates (not shown) may be used in combination. Change in the X-direction position of the cam shaft 60 due to the oscillation is attached a rotary encoder S ₂ for detecting the rotational position of the eccentric rotor 51 to the shaft of the eccentric rotor 51, is detected.

  There are various types of the wrapping film 11, but in this embodiment, the base material is made of a material having high non-stretch properties, for example, polyester having a thickness of about 25 μm to 130 μm. A large number of abrasive grains (specifically, made of aluminum oxide, silicon carbide, diamond, etc.) having a particle size of about several μm to 200 μm are attached by an adhesive.

2 and 3, the wrapping film 11 is pulled out from the supply reel 15 and attached to a pair of first guide rollers R ₁ provided at the tip of the upper arm 22 and an inner position of the upper arm 22. Guided by a second guide roller R ₂ , a third guide roller R ₃ attached to the inner position of the lower arm 23, a pair of fourth guide rollers R ₄ provided at the tip of the lower arm 23, etc. It is wound on a take-up reel 16. A motor M ₃ is connected to the take-up reel 16, and when the take-up reel 16 is rotated by the motor M _{3, the} wrapping film 11 is sequentially fed out from the supply reel 15. To detect the movement amount of wrapping film 11, the axis of the take-up reel 16, the rotary encoder S ₃ for detecting the amount of rotation is mounted. A lock device (not shown) is provided in the vicinity of the supply reel 15 and the take-up reel 16, and a predetermined tension is applied to the entire film 11 by the operation of the lock device.

  The upper arm 22 and the lower arm 23 forming a pair are supported by a support pin 24 so that the front ends thereof open and close in the Z direction, and a fluid pressure cylinder 25 operated by hydraulic pressure or air pressure is provided at the rear end portion of the upper arm 22. One end of the piston rod 26 is pin-connected to the rear end of the lower arm 23. When the piston rod 26 protrudes, the upper and lower arms 22 and 23 close and rotate with the support pin 24 as the center to be in the closed state shown in FIG. On the other hand, when the piston rod 26 is retracted, the upper and lower arms 22 and 23 are in the open state shown in FIG. The upper and lower arms 22, 23 are rotated together with the wrapping film 11, the shoe means 70 comes into contact with the cam lobe portion 61 via the wrapping film 11 by the closing rotation, and the cam lobe portion 61 and the shoe means 70 are rotated by the opening rotation. Release contact with.

  5 is a front view showing a part of the shoe means according to the present embodiment, FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a sectional equivalent view taken along line 7-7 in FIG. .

  The shoe means 70 is held by a shoe case 28 installed in a recess 27 formed at the tip of the upper and lower arms 22, 23, and above and below the cam lobe 61, on a surface perpendicular to the rotation axis of the workpiece W. Although they are opposed to each other in pairs (see FIGS. 2 and 3), only one of them will be described here for simplicity.

  As shown in FIGS. 5 and 6, each shoe means 70 includes a shoe holder 80 that is held by a shoe case 28 so as to be swingable about a fulcrum P, and a pair of shoes provided so as to be rotatable on the shoe holder 80. And a roller-like shoe 71.

  Each roller-like shoe 71 of the present embodiment is a disc-like one that is rotatable about a rotation shaft 72, but the outer peripheral surface of the shoe 71 is axially oriented as shown in FIGS. The cross section has a concave shape. The reason why the concave shape is formed is to form the circumferential surface of the cam lobe portion 61 into an arcuate middle convex shape in the axial direction. However, in the present invention, not only this but also the outer circumferential surface of the shoe 71 is flat. It may be a simple disc-shaped shoe.

  Each shoe means 70 has a pair of roller-like shoes 71. When the shoe means 70 arranged on the upper and lower sides are in contact with the machining surface of the cam lobe portion 61, four roller-like shoes 71 on the upper and lower sides are provided. This is because the cam lobe portion 61 is supported at four points, and the cam lobe portion 61 can be stably rotated.

  As the roller shoe 71, for example, metal, ceramic, hard urethane resin, or the like can be used. As the hard urethane resin, a material excellent in oil resistance and water resistance is preferable. For example, a polyether urethane elastomer Prepolymers for use are preferred.

  On the other hand, the shoe holder 80 is provided with two relatively thick support plates 81 that hold a pair of roller-shaped shoes 71 rotatably, with a predetermined distance therebetween. Each roller-like shoe 71 provided between the two support plates 81 has a part of the outer peripheral surface protruding to the outside, and is rotatably held at a position where the rotary shafts 72 are parallel and do not interfere with each other.

  The fulcrum P at which the shoe case 28 holds the shoe holder 80 in a swingable manner is a rotation axis of each roller shoe 71 so that the shoe holder 80 is supported in a swingable manner in a plane perpendicular to the rotation axis of the workpiece W. 72, and is provided at a position equidistant from the rotation shaft 72 of each roller shoe 71.

  As this fulcrum P, in this embodiment, a through hole 82 is formed in the support plate 81 and a pin 83 protruding from the shoe case 28 is inserted. Needless to say, the pin 83 may be fitted in the through hole provided on the shoe case 28 side.

  2 and 3, the shoe case 28 is ejected toward the work surface of the work W by the work clamping spring 33 and presses the wrapping film 11 against the work surface of the work W, but the fulcrum P is a cam. Positioning on a line passing through the axis O of the shaft 60 is preferable because the pressing force of the shoe by the spring 33 or the like can be applied to the wrapping film 11 efficiently.

  In the shoe holder 80, the wrapping film 11 is fed between two opposing support plates 81 and arranged along the circumferential surface of each roller shoe 71 or the like. A folding member 84 is provided between the roller shoes 71 in parallel with the axis of the roller shoes 71 so as to be wound around the outer peripheral surface as long as possible. Since the folding member 84 abuts the surface of the wrapping film 11 on which the abrasive grains are provided, it is preferable to use a ceramic or a hardened pin or the like, as long as it has a material with excellent wear resistance. Any thing is acceptable.

  The shoe holder 80 is provided with stopper mechanisms 85 respectively on the feeding side and the feeding side of the wrapping film 11. As described above, the wrapping film 11 is locked by a locking device provided in the vicinity of the supply reel 15 and the take-up reel 16 and is given a predetermined tension, but the shoe means 70 is actually subjected to the wrapping process. Locking in the vicinity is more preferable because displacement can be prevented even if an excessive surface pressure is applied to the edge portion of the workpiece W that reciprocates during oscillation.

  The stopper mechanism 85 presses and fixes the wrapping film 11 to the outer peripheral surface of the roller shoe 71. The stopper mechanism 85 is provided with a stopper roller 86 between the two support plates 81 on the feeding side and the feeding side, respectively. The rotating shaft 87 of the stopper roller 86 is advanced and retracted by the air cylinder 88, and the stopper roller 86 is pressed against the outer peripheral surface of the roller shoe 71.

  A rotation shaft 87 of the stopper roller 86 is inserted into a long hole O formed in the support plate 81, and one end of a piston rod 89 in an air cylinder 88 installed in each support plate 81 is connected. Therefore, if compressed air is supplied to and discharged from the air cylinder 88 by the air hose 90, the piston 91 is operated, the stopper roller 86 is moved close to and away from the roller shoe 71 via the rotating shaft 87, and the wrapping film 11 is rolled. The shoe 71 is pressed against or separated from the outer peripheral surface of the shoe 71.

  Needless to say, regarding the driving of the stopper roller 86, not only pneumatic pressure but also hydraulic pressure, spring, tension, or the like may be used.

  Here, the outer peripheral surface of the stopper roller 86 has a shape along the outer peripheral surface of the roller-like shoe 71. If the outer peripheral surface of the roller-like shoe 71 is concave in the axial direction, a convex shape corresponding to this is formed. In addition, if it is a smooth annular surface, it will be set as the annular surface corresponding to this.

  In the shoe holder 80 provided with the roller shoe 71, the folding member 84, the stopper roller 86 and the like as described above, the wrapping film 11 guided between the two support plates 81 is fed to the stopper roller 86 on the feeding side → one side. After being wound around the roller-like shoe 71 → the folding member 84 → the other roller-like shoe 71 → the stopper roller 86 on the delivery side, it is drawn out of the shoe holder 80.

The motors M ₁ , M ₂ , M ₃ , M ₄ and the rotary encoders S ₁ , S ₂ , S ₃ are connected to a controller 200 mainly composed of a CPU and a memory. The controller 200 controls the motors M ₁ , M ₂ , M ₃ , and M ₄ while monitoring the detection results of the rotary encoders S ₁ , S ₂ , and S ₃ . Controls the operation of each component.

  Next, the operation will be described.

First, both the pressing arms 22 and 23 respectively in the open state, and sets the cam shaft 60 between the headstock 42 and tailstock 46, also rotates the take-up reel 16 actuates the motor M _3. In the case of the used wrapping film 11, it moves by a predetermined amount, and a new abrasive grain surface is set on the processed surface. As the wrapping film 11 moves, the shoe means 70 rotates the roller shoe 71, and the shoe 71 itself is set with a new pressure surface.

  At this stage, when a locking device provided near the supply reel 15 is locked and the winding reel 16 on the opposite side is further rotated, a predetermined tension is applied to the wrapping film 11. Also in the shoe means 70, the wrapped wrapping film 11 is in close contact with the outer peripheral surfaces of the pair of roller shoes 71 with a predetermined tension.

  When the air in the air cylinder 88 of the shoe means 70 is sucked and discharged, the stopper roller 86 moves to the roller shoe 71 side, the stopper roller 86 is pressed against the outer peripheral surface of the roller shoe 71, and the wrapping film therebetween 11 is held in a fixed position.

  When the stopper roller 86 on the feeding side is operated after the stopper roller 86 on the feeding side is operated, the outer peripheral surface of the roller-like shoe 71 is caused without loosening or unnecessary tension on the wrapping film 11. Can be held in. When the locking device near the take-up reel 16 is locked, the attachment of the wrapping film 11 is completed.

  Next, when the fluid pressure cylinder 25 is operated, the piston rod 26 is protruded, the upper and lower arms 22 and 23 are closed and rotated, and the wrapping film 11 is set on the processing surface of the cam lobe portion 61. In the shoe means 70, the shoe holder 80 is elastically pushed by the work clamping spring 33, so that the roller-shaped shoe 71 and the abrasive surface of the wrapping film 11 are pressed against the cam lobe portion 61.

Upon actuation of the motor M _1, and the workpiece W is rotated, the working surface is lapped by abrasive surface of the lapping film 1. Also, when operating the motor M _2, the eccentric rotor 51 is rotated against the elastic force of the elastic means 52 to reciprocate the table 49 in the X direction, to oscillation of the workpiece W in the X direction.

  Accordingly, when the workpiece W is oscillated in the axial direction simultaneously with the rotation of the shaft center, the distance between the workpiece W and the abrasive grains increases, the number of working abrasive grains per unit time with respect to the workpiece W increases, and the machining time Can be shortened and the machining efficiency of the workpiece can be increased.

  The camshaft 60 has a large number of cam lobes 61, which are lapped together.

  In the present embodiment, the shoe means 70 presses the wrapping film 11 against the outer peripheral surface of the roller-shaped shoe 71 by the stopper mechanism 85 so that the wrapping film 11 to which the tension is applied is applied to the roller-shaped shoe 71. There is no risk of misalignment.

  That is, when the air in the air cylinder 88 of the stopper mechanism 85 is sucked, the stopper roller 86 moves to the roller shoe 71 side and presses against the outer peripheral surface of the roller shoe 71 while applying tension to the wrapping film 11. The wrapping film 11 is brought into close contact with the outer peripheral surface of the roller shoe 71. In addition, the rotation of the roller shoe 71 itself is also restricted by the pressing force of the stopper roller 86 and is not displaced.

  Therefore, in order to form the workpiece W into a convex shape, when the shoe 71 having a concave shape in the axial direction of the workpiece is used and the processed surface of the workpiece is molded following the shape of the tip of the shoe, the outer side of the wrapping film 11 is formed. Even if an excessive surface pressure is applied to the edge portion than the edge portion of the workpiece W that reciprocates during oscillation, the wrapping film 11 itself will not be displaced, the number of working abrasive grains is reduced, and the processing efficiency is improved. There is no decline.

In the lapping process, when the preset number of processes or rotation speed is reached or the set process time elapses, the motors M ₁ and M ₂ are stopped or the fluid pressure cylinder 25 is operated to move the upper and lower arms 22, 23 is opened and the wrapping film 11 is released from the workpiece W, and the process is completed.

After completion of machining, to the wrapping film 11 into a new plane, operates both stopper roller 86 by the stopper mechanism 85, is separated from the roller-shaped shoe 71, the take-up reel 16 is operated by the motor M _3, wrapping film 11 is sent out from the shoe holder 80 by a predetermined amount.

  In this case, since both the stopper rollers 86 and the folding member 84 are rotatably attached to the shoe holder 80, there is no friction or wear with the wrapping film 11, and the wrapping film 11 moves smoothly. Can be made.

  In particular, since the folding member 84 is provided between the plurality of roller-like shoes 71, even if each of the roller-like shoes 71 has a concave shape, the deviation in the feeding direction of the wrapping film 11 is suppressed and the feeding is smoothly performed.

  In addition, even when the shoe is subjected to wear due to rubbing with the wrapping film 11 or deformation due to a load, the roller-like shoe 71 also rotates as it moves to a new surface of the wrapping film 11, and the load is applied at the new portion. Therefore, the wear and deformation of the roller shoe 71 can be suppressed, the predetermined concave and convex shape can be maintained over a long period of time, the surface roughness of the workpiece is not deteriorated, and the operation of the apparatus is not required to be frequently replaced. The rate is also improved, and stable processing quality can be obtained over a relatively long period.

  Here, as an example of processing conditions, when the camshaft 60 is rotated at 120 rpm, the wrapping film 11 is pressed against the cam lobe 61 at 0.4 Mpa by the roller shoe 71, and the oscillation frequency is processed at 100 Hz. Good processing results have been obtained. In addition, the frequency of replacement with a new surface of the wrapping film 11 is that the workpiece W is processed four times in forward rotation and four times in reverse rotation under the above processing conditions, and then replaced with a new surface. I was able to get it.

  As described above, in the present embodiment, the shoe provided on the back side of the wrapping film 11 is constituted by a plurality of roller-like shoes 71 and is held rotatably on the shoe holder 80. In order to form the workpiece W in a middle convex shape, the roller shoe 71 is worn and deformed even if the outer peripheral surface shape of each roller shoe 71 is a concave shape in the axial direction. It can be suppressed, the life is extended, and stable processing quality can be obtained over a long period of time. In addition, when the roller shoe 71 is replaced with a new one, since the shape is simple, the manufacture is easy and the jig cost can be reduced.

  The shoe holder 80 is also held rotatably at a position where the rotation axis directions of the roller shoes 71 are parallel and do not interfere with each other, and is parallel to the rotation axis direction of each roller shoe 71 and equidistant from the rotation shaft 72. Since the fulcrum P is provided and can be swung around the fulcrum P, the workpiece W can be stably held, and the processing surface can be processed smoothly with uniform processing.

  Since the folding member 84 of the wrapping film 11 is provided between the plurality of roller-shaped shoes 71, the shift in the feeding direction of the wrapping film 11 can be further suppressed.

  Since the shoe means 70 has the stopper mechanism 85 that presses the wrapping film 11 against the outer peripheral surface of the roller-like shoe 71 and holds it securely, the wrapping film 11 can be brought into close contact with the roller-like shoe 71. Therefore, the back coating of the anti-slip resistant material provided on the back surface of the wrapping film 11 and the anti-slip processing are not required, which is advantageous in terms of cost, and the roller shoe 71 made of the anti-slip coating material. Such friction and wear are eliminated.

  The stopper roller 86 of the stopper mechanism 85 has a shape that presses the wrapping film 11 along the outer peripheral surface shape of the roller shoe 71, so that the wrapping film 11 is reliably pressed and fed very smoothly. Can be.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in this embodiment, two roller shoes are used for one shoe holder, but two or more roller shoes may be used.

  INDUSTRIAL APPLICABILITY The present invention is suitable for finishing molding of a camshaft of an automobile engine, particularly a cam lobe portion by lapping.

It is the schematic of a lapping apparatus. It is a schematic sectional drawing which shows the upper-lower arm closed state of the lapping apparatus. It is a schematic sectional drawing which shows the open state of the same up-and-down arm. (A) is a perspective view which shows the cam shaft which is an example of the workpiece | work which is lapped, (B) is explanatory drawing of each part of the cam lobe part of the cam shaft. It is a front view showing a part of a shoe concerning this embodiment. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. FIG. 7 is a cross-sectional equivalent view taken along line 7-7 in FIG. 5.

Explanation of symbols

11 ... Wrapping film,
28 ... Shoe case,
40: Rotation drive unit,
50 ... Oscillation unit,
60 ... Camshaft,
61 ... Cam lobe part,
70 ... shoe means,
71 ... Roller shoe
80 ... Shoe holder,
84 ... folded member,
85 ... stopper mechanism,
86: Stopper roller,
W ... Work.

Claims (6)

A long strip-shaped wrapping film that covers the processed surface of the arc-shaped workpiece having a non-circular cross section and is provided with abrasive grains on one surface of the thin substrate;
A rotation driving means for rotating the workpiece;
Oscillation means for oscillating the workpiece in the axial direction;
Shoe means provided on the back side of the wrapping film and pressing the abrasive surface of the wrapping film against the work surface of the workpiece;
A lapping apparatus having
The lapping apparatus according to claim 1, wherein the shoe means comprises a shoe provided on the back side of the wrapping film by a plurality of roller-shaped shoes, and the roller-shaped shoes are rotatably held by a shoe holder.   The shoe holder is rotatably held at a position where the rotation axis directions of the plurality of roller shoes are parallel and do not interfere with each other, and is parallel to the rotation axis direction of the plurality of roller shoes and The lapping apparatus according to claim 1, wherein a support shaft parallel to the rotation axis of the workpiece is provided at an equal distance from the rotation shaft so as to be swingable about the support shaft.   The lapping apparatus according to claim 1 or 2, wherein each of the roller-shaped shoes has an outer peripheral surface that is a concave shape in the axial direction.   The lapping apparatus according to any one of claims 1 to 3, wherein the shoe means includes a folding member that causes the wrapping film to run along an outer peripheral surface of the roller-shaped shoe between the plurality of roller-shaped shoes. .   The lapping apparatus according to any one of claims 1 to 4, wherein the shoe means has a stopper mechanism that holds the wrapping film against the outer peripheral surface of the roller-like shoe and holds it in a fixed manner.   6. The lapping apparatus according to claim 5, wherein the stopper mechanism has a stopper roller having a shape of a surface that presses the wrapping film and an outer peripheral surface shape that follows the outer peripheral surface shape of the roller shoe. .

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