JP3009581U - Lathe jig - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lathe jig capable of accurately and efficiently cutting and forming an end surface of a workpiece into a slope having a predetermined angle. [Structure] A support cylinder 3 tilted at a predetermined angle α with respect to an axis at the front of a cylindrical holder 1 whose base is held by a chuck T
And projecting and fixing the notch groove 2 near the base of the bearing cylinder 3.
In the circumferential direction, and a small diameter portion 3'is formed in the middle of the support cylindrical body 3 through a shallow step portion, and the workpiece W is fitted to the small diameter portion 3'in a non-rotating state. It is fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lathe processing jig capable of cutting and forming an end surface of a workpiece into a slope having a predetermined inclination angle with respect to an axis.

[0002]

[Prior art]

 In order to improve the initial familiarity of the piston ring 60, it is provided that the upper and lower outer peripheral corners of the piston ring 60 are lapped to form a curved outer peripheral surface. This lapping process is provided with a collar as shown in Fig. 5. The body portion of the bush-shaped ring bearing e is formed as a fitting portion 61 for fitting the piston ring 60, and a receiving collar 62 for supporting the piston ring 60 is provided below the fitting portion 61. The upper and lower surfaces of the receiving collar 62 and the end surface of the fitting portion 61 form a slope 54 having a predetermined inclination angle (usually from 0 ° 30 ′ to 7 ° 30 ′) with respect to the axial right angle surface. A stepped collar portion f'is provided in the middle of the piston rod f. A collar washer g having an upper surface at a right angle to the axis of the piston rod f and a lower surface having a slope 54 is inserted from below to the stepped collar portion f '. A plurality of ring bearings e (three in the figure) and a ring bearing e ′ having the same shape as the ring bearing e and a bottom surface of which has a bottom surface perpendicular to the axis are stacked and inserted below. The unwrapped piston rings 60 'are stacked and fitted into the fitting portions 61 of the respective ring bearings e and e', and the collar washer g and the ring bearings e and e'with the piston ring 60 'are washered. The piston ring 60 'is clamped with the collar washer g and the washer h by tightening it to the piston rod f with the nut i through h to form an integral body. The upper and lower surfaces of each piston ring 60 'are stacked in an overlapping state in an inclined state according to the angle of the slope 54, and are clamped by the stepped collar portion f'and the washer h, and the outer circumference of the upper left surface of each piston ring 60' Since the end portion and the right lower surface semi-peripheral portion are sandwiched so as to project slightly to the outer periphery as shown in FIG. 6 (a), this piston rod f is gently rotated in the trapping cylinder j. While reciprocating up and down, the protruding portion was lapped as shown in FIG. 6B to finish the desired outer peripheral cross section as shown in FIG. 6C.

However, in this case, since the slopes 54 of the ring bearings e, e ′ and the collar washer g must be formed as slopes having a predetermined inclination angle with respect to the axis, this slope is simply used in the lathe chucking work. Formation of 54 was a difficult and inefficient task.

The applicant first proposed a patent for a lathe, which is capable of efficiently cutting an end surface of a work piece into a slope shape by a lathe, obtained a patent, and solved this problem. did.

The purpose is to say “a holder a for axially projecting a male screw 51 at the center of the tip end surface of a cylinder to hold the base portion on a chuck T 1 and a slope 54 formed on one side of the end surface. A screw hole 55 into which the male screw 51 is screwed is formed at the center of 54 perpendicularly to the slope 54, and a small diameter portion for fitting the workpiece W to the large diameter portion 56 on the base side in a non-rotating state. In the center to hold the tip surface of the support body b in which 58 are connected and the bolt hole 59 is formed at the center of the tip surface of the small diameter portion 58, and the tip surface of the workpiece W fitted in the small diameter portion 58 of the support body b FIG. 4 is a block diagram of a lathe jig composed of a holding board c having a bolt through hole 57 and a bolt d screwed into the bolt hole 59.

[0006]

[Problems to be solved by the device]

 However, when the ring support e is formed by turning the end face of the workpiece W having the flanged bush shape and the upper and lower surfaces of the receiving collar 62 into an inclined shape with the lathe jig, the workpiece W is supported. After fitting the small diameter portion 58 of the body a and tightening it with the bolt d and turning the front end face of the workpiece W and the upper surface of the receiving collar 62, the workpiece W is removed from the jig and the workpiece W is removed. Since the lower surface of the brim 62 which is in contact with the large diameter portion 56 has to be separately machined, there is a drawback that it takes a lot of processing man-hours and the concentricity is not sufficient.

The present invention solves the above-mentioned drawbacks, and a lathe capable of accurately and efficiently forming a slope 54 at a predetermined angle on the end face of a workpiece W while the workpiece W is attached to a lathe jig. A processing jig is provided.

[0008]

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

A support cylinder 3 that inclines at a predetermined angle α with respect to the axis is projectingly fixed to the front of the cylindrical holder 1 that holds the base with a chuck T, and a cut is made near the base of the support cylinder 3. The groove portion 2 is circumferentially provided, and a small diameter portion 3'is formed in the middle of the support cylindrical body 3 through a shallow step portion, and the workpiece W is prevented from rotating in the small diameter portion 3 '. The present invention relates to a lathe jig which is fitted and fixed.

[0010]

[Action]

 When the base of the cylindrical holder 1 is held by the chuck T and the workpiece W having a flanged bush shape as shown in FIG. The workpiece W is fitted and fixed in an inclined state at a predetermined angle α with respect to the rotation axis of the chuck T of the lathe.

When the chuck T is rotated, the tip of the workpiece W makes an eccentric rotary motion like a rotary pendulum having a cone angle of 2α °, and in this state, the upper and lower sides of the flange 62 of the workpiece W move upward and downward. When the end surface is cut with a cutting tool, the upper and lower surfaces of the receiving collar 62 are cut at a right angle to the rotation axis of the chuck T, and an inclined end surface with a predetermined angle is formed on the end surface of the workpiece W. The front end of the support cylinder 3 also cuts the outer peripheral surface of the cut groove portion 2 of the support cylinder 3 and the fitting portion 61. Due to the limitation of the cut amount, the receiving flange close to the shallow step portion of the support cylinder 3 and the fitting portion 61. At the end face of 62, a flat uncut portion 4 which is not a crescent-shaped slope is formed as shown in FIG. Then, the front end surface of the workpiece W is cut at a right angle to form an inclined end surface at a predetermined angle α on the workpiece W. In this case as well, due to the presence of the fixing metal fittings that fix the workpiece W to the jig, the uncut flat portion 4 is generated due to the limitation of the cutting depth as described above, but the fixing metal fittings are removed to prevent the workpiece W from rotating. In this state, the cutting tool is notched while it is still fitted in the small-diameter portion 3 ', and the flat-machined portion 4 is cut to form an inclined end face.

Next, the workpiece W is removed from the small diameter portion 3 ′, the workpiece W is turned over as shown in FIG. The lower surface of the receiving collar 62 is cut and formed into a desired inclined surface 54 until it is fitted in the rotation prevention state. Further, the crescent-shaped flat unmachined portion 4 on the upper surface of the flange 62 is finished based on the slope 54 cut by a file or the like, so that a desired inclined slope as shown in FIG. Is formed.

[0013]

【Example】

 The illustrated drawing shows an example of a preferred embodiment of the present invention. A flange 1'is provided at the front of a cylindrical holder 1 whose base is held by a chuck T, and a male part is provided in front of the flange 1 '. A threaded portion 1 ″ is provided to project. A female threaded portion is provided on the flange portion of the base portion of the support cylindrical body 3, and this female threaded portion is screwed to the male threaded portion 1 ″ and the cylindrical support 1 is supported by the support cylindrical body 3. Is provided by projecting and fixing, and the projecting tubular portion of the supporting tubular body 3 is provided so as to be inclined at a predetermined angle α with respect to the axis of the cylindrical holding body 1, and the projecting tubular portion of the supporting tubular body 3 is near the base portion. The cut groove portion 2 is circumferentially provided, and a small diameter portion 3'is formed in the middle of the support cylinder 3 via a shallow step portion 3 ".

As shown in FIG. 1, the tubular portion of the small diameter portion 3 ′ is provided with a rotation stopping means such as a key 5 which serves as a rotation prevention when the workpiece W is fitted on the front surface side or the rear surface side of the paper surface, A tap hole is screwed on the tip surface of the small diameter portion 3 '.

The workpiece W is fitted into the small diameter portion 3 ′, and the workpiece W is provided with a detent means such as a keyway 8 which engages with the detent means. The presser foot 6 is inserted into the tip portion and tightened with the bolt 7, and the workpiece W is fitted and fixed to the small-diameter portion 3 ′ in a non-rotating state.

Since this embodiment is configured as described above, various supporting cylinders 3 are manufactured in accordance with the inclination angle and shape of the slope of the workpiece W, so that the workpiece W can have a desired angle. The slope 54 can be easily and accurately cut by a lathe.

[0017]

[Effect of device]

 According to the present invention, a supporting cylinder that inclines at a predetermined angle with respect to the axis is projectingly fixed to the front part of a cylindrical holder that holds a base by a chuck, and a notch groove is circumferentially formed near the base of the supporting cylinder. Direction, and a small diameter part was formed in the middle of the support cylinder through a shallow step, and the work piece was fitted and fixed to this small diameter part in a non-rotating state. Compared with the inaccurate and inefficient machining method in which the slope of the contact surface between the workpiece and the jig could not be cut and had to be machined separately, the workpiece could be machined with one chuck. Since core processing is possible, the processing accuracy is improved, the processing time is significantly shortened, the productivity is improved, and the jig for lathes has high mass productivity.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a usage example in which a body to be cut is fitted to a processing jig of an example is cut away.

FIG. 2 is a drawing showing a processing state of the workpiece, in which the upper and lower end surfaces of the flange of the workpiece and the front end surface of the workpiece are cut at a right angle in the state of FIG. After cutting the remaining flat part of the tip surface, turn over the work piece and show the state where the work piece is fitted to the small diameter part with the key and the key way in a non-rotating state. is there.

FIG. 3 is a side view of a ring bearing body in which an inclined surface having a predetermined angle is formed on a workpiece.

FIG. 4 is a side view showing a usage state of a conventional cutting jig with a part cut away.

FIG. 5 is a side view in which a part of a rapping device for a piston ring is cut away.

FIG. 6A is an explanatory view showing a state of an unwrapped piston ring held by a lapping jig.
(B) is an explanatory view showing a lapped state of the piston ring in the wrapping cylinder, and (C) an explanatory view showing the lapped piston ring formed in a curved surface on the outer peripheral surface.

[Explanation of symbols]

 T Chuck α Predetermined angle W Workpiece 1 Cylindrical holder 2 Cut groove 3 Bearing cylinder 3'Small diameter part

Claims (1)

[Scope of utility model registration request] 1. A support cylinder that inclines at a predetermined angle with respect to the axis is projectingly fixed to the front of a cylindrical holder that holds the base by a chuck, and a notch groove is formed near the base of the support cylinder. A lathe which is provided in a circumferential direction, and a small diameter portion is formed in the middle of a supporting cylinder through a shallow step portion, and a work piece is fitted and fixed to the small diameter portion in a non-rotating state. Jig.