JP6831604B1 - Cylindrical grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical grinding apparatus capable of performing machining having a high coaxiality with respect to a central axis of a work having a cylindrical shape. SOLUTION: A cylindrical grindstone device 100 is attached to a fixed side center shaft mounting base 20 and a moving side center shaft mounting base 30 and a fixed side center shaft mounting base 20 arranged so as to face each other on a main base 10, and is cylindrical. A fixed side center shaft 21 that supports one end of a workpiece 60 having a shape, a moving side center shaft 31 that is attached to a moving side center shaft mounting base 30 and supports the other end of the work 60, and a moving side. A work rotation mechanism 40 that is mounted on the center shaft mounting base 30 and grips the work 60 and rotates around its axis, and an outer peripheral surface of the work 60 that is horizontally supported by the fixed side center shaft 21 and the moving side center shaft 31. It is equipped with a grindstone 50 for processing. [Selection diagram] Fig. 2

Description

The present invention relates to a grinding apparatus suitable for use in grinding a workpiece having a cylindrical shape.

Cylindrical grinding machine: A cylindrical grinding machine is widely used as a machine tool that applies a grindstone (grinding grindstone) that rotates at high speed to a workpiece having a cylindrical shape and grinds the outer peripheral portion thereof (for example, Patent Document 1 and the like).

JP-A-2010-042482

When machining a cylindrical workpiece using a cylindrical grinding machine, it is necessary to rotate the workpiece in the direction opposite to the rotating grindstone. Usually, in order to rotate the work, a method is adopted in which both ends of the work are held by a center shaft (or a scroll chuck or the like) and the work is rotated by rotating the center shaft.

However, in the case of such a work holding structure, a bearing, a bush, or the like is used for the rotating portion of the center shaft. Therefore, in order to rotate the center shaft, a radial direction is used between the bearing, the bush, or the like and the center shaft. A gap is required, and this gap causes misalignment between the center shafts.

If the center shafts are misaligned, the workpiece will rotate while being eccentric to the rotating grindstone in either the up, down, left, or right direction, so the depth of cut and the angle of cut of the grindstone will not be constant. .. As a result, for example, when a work is grooved, a machining error occurs in the machined groove in the coaxiality and the squareness with respect to the central axis of the work.

In this way, in order to perform high-precision grinding on a work having a cylindrical shape, the axial misalignment between the members that support the work from both sides is extremely small, that is, the member that supports the work from both sides. It is required to secure the coaxiality between them with high accuracy.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a cylindrical grinding device capable of performing machining having a high coaxiality with respect to a central axis of a work having a cylindrical shape. There is.

The cylindrical grinding device according to the first aspect of the present invention comprises a fixed-side mounting base and a moving-side mounting base arranged to face each other on the main base, and a work mounted on the fixed-side mounting base and having a cylindrical shape. A fixed-side work supporting means that supports one end, a moving-side work supporting means that is attached to the moving-side mounting base and supports the other end of the work, and a moving-side mounting base that is attached to the moving-side mounting base. It is provided with a guide mechanism that grips the work and rotates it around its axis.

In the cylindrical grinding apparatus according to the second aspect of the present invention, in the first aspect, the guide mechanism includes a rotary handle, a timing pulley and a timing belt connected to the rotary handle, and a guide for gripping the work. The guide portion is configured to be provided with a portion and to rotate the guide portion via the timing pulley and the timing belt by rotating the rotary handle.

In the cylindrical grinding machine according to the third aspect of the present invention, in the first or second aspect, the processing of the outer peripheral surface of the work is grooving.

In any one of the first to third aspects, the cylindrical grinding apparatus according to the fourth aspect of the present invention has a contact surface between the main base and the fixed side mounting base, and the main base and the moving side mounting base. The main base side of the contact surface has a trapezoidal shape, and the fixed side mounting base side and the moving side mounting base side have a V-groove shape.
The cylindrical grindstone device according to a fifth aspect of the present invention has, in any one of the first to fourth aspects, the outer peripheral surface of the work supported by the fixed side work supporting means and the moving side work supporting means. Further equipped with a grindstone to process.
In the cylindrical grinding apparatus according to the sixth aspect of the present invention, in any one of the first to fifth aspects, the fixed side work supporting means is a fixed side center shaft, and the moving side work supporting means is a moving side. It is a center shaft.

According to the present invention, there is provided a cylindrical grinding apparatus capable of performing machining having a high coaxiality with respect to the central axis of a work having a cylindrical shape.

It is a top view which shows the structure of the cylindrical grinding apparatus which concerns on embodiment of this invention. It is sectional drawing in the direction of arrow II-II in FIG. It is a side view in the direction of arrow III in FIG. It is a side view in the direction of arrow IV in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the range necessary for the explanation for achieving the object of the present invention will be schematically shown, and the range necessary for the explanation of the relevant part of the present invention will be mainly described. It shall be based on known technology.

FIG. 1 is a plan view showing the configuration of a cylindrical grinding apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view in the direction of arrow II-II in FIG. 1, and FIG. 3 is a direction of arrow III in FIG. FIG. 4 is a side view in the direction of arrow IV in FIG.

The cylindrical grindstone device 100 of the present embodiment is mounted on the fixed side center shaft mounting base 20 and the moving side center shaft mounting base 30 and the fixed side center shaft mounting base 20 arranged so as to face each other on the main base 10, and is cylindrical. A fixed side center shaft 21 that supports one end of a workpiece 60 having a shape, a moving side center shaft 31 that is attached to a moving side center shaft mounting base 30 and supports the other end of the work 60, and a moving side. A work rotation mechanism 40 that is mounted on the center shaft mounting base 30 and grips the work 60 and rotates around its axis, and an outer peripheral surface of the work 60 that is horizontally supported by the fixed side center shaft 21 and the moving side center shaft 31. It is equipped with a grindstone 50 for processing.

As shown in FIG. 2, the fixed-side center shaft 21 mounted on the fixed-side center shaft mounting base 20 enables smooth reciprocating motion while reliably holding one end of the work 60, which is the object to be machined. In order to do so, the spring 22 is urged in the direction toward the work 60.

Further, the fixed side center shaft 21 is supported by a metal bush 23 in order to enable reciprocating motion without backlash due to low sliding resistance, and by swinging the attached arm 24, the arm 24 The pinion gear 25 and the rack 26 at the tip are configured to enable smooth reciprocating motion without misalignment. With this structure, the work 60 horizontally supported by the fixed side center shaft 21 and the moving side center shaft 31 is always pressed from both sides toward the center with a constant force.

The inner diameter of the fixed side center shaft mounting hole 27 provided in the fixed side center shaft mounting base 20 and the outer diameter of the metal bush 23 are matched, and the inner diameter of the metal bush 23 and the outer diameter of the fixed side center shaft 21 are matched. The diameter is also adjusted. As a result, even after the fixed side center shaft 21 is attached to the fixed side center shaft mounting base 20, high mounting accuracy without radial backlash can be ensured.

As shown in FIG. 3, the contact surface between the main base 10 and the fixed side center shaft mounting base 20 has a trapezoidal shape on the main base 10 side and a V-groove shape on the fixed side center shaft mounting base 20 side. ..

When mounting the fixed side center shaft mounting base 20 on the main base 10, for example, when the diameter of the fixed side center shaft mounting hole 27 is φ20 mm, the position of the central axis of the fixed side center shaft mounting hole 27 is the main base 10. From the reference planes A and B of
X-axis datum: 50 ± 0.002 mm from B,
Z-axis direction reference plane: 160 ± 0.003 mm from A,
The V-groove portion of the fixed-side center shaft mounting base 20 is polished so as to be so that the two are aligned.

By devising the shape of the contact surface between the main base 10 and the fixed side center shaft mounting base 20 in this way, the fixed side center shaft mounting base 20 can be mounted on the main base 10 without play.

On the other hand, the moving side center shaft 31 that supports the other end of the work 60 is inserted into the moving side center shaft mounting hole 37 provided in the moving side center shaft mounting base 30. That is, the moving side center shaft 31 itself does not rotate, and is fastened and fixed at a position coaxial with the moving side center shaft mounting hole 37 without play.

When mounting the moving side center shaft 31 in the moving side center shaft mounting hole 37, the inner diameter of the moving side center shaft mounting hole 37 and the outer diameter of the moving side center shaft 31 are matched in order to eliminate backlash in the radial direction. Will be done. As a result, even after the moving side center shaft 31 is attached to the moving side center shaft mounting base 30, high mounting accuracy without radial backlash can be ensured.

As shown in FIG. 4, the contact surface between the main base 10 and the moving side center shaft mounting base 30 has a trapezoidal shape on the main base 10 side and a V-groove shape on the moving side center shaft mounting base 20 side. ..

When mounting the moving side center shaft mounting base 30 on the main base 10, for example, when the diameter of the moving side center shaft mounting hole 37 is φ20 mm, the position of the central axis of the moving side center shaft mounting hole 37 is the main base 10. From the reference planes A and B of
X-axis datum: 50 ± 0.002 mm from B,
Z-axis direction reference plane: 160 ± 0.003 mm from A,
The V-groove portion of the moving side center shaft mounting base 30 is polished so as to be so that the two are aligned.

By devising the shape of the contact surface between the main base 10 and the moving side center shaft mounting base 30 in this way, the moving side center shaft mounting base 30 can be mounted on the main base 10 without play.

A rail groove 11 is provided on the upper surface of the main base 10 along the Y direction, and a guide pin 32 fitted in the rail groove 11 is provided in the V groove portion of the moving side center shaft mounting base 30. ing. The moving side center shaft mounting base 30 is mounted on the main base 10 in a state where it can be moved along the rail groove 11.

When mounting the work 60 on the cylindrical grinding device 100, center holes are formed in advance at both ends of the work 60, and one center hole of the work 60 is inserted into the tip of the fixed side center shaft 21. Next, the moving side center shaft mounting base 30 is moved along the rail groove 11 of the main base 10, and the tip of the moving side center shaft 31 is inserted into the other center hole of the work 60.

As described above, the cylindrical grinding device 100 of the present embodiment has two center holes (fixed side center shaft) of the fixed side center shaft mounting base 20 and the moving side center shaft mounting base 30 in the X and Z directions with reference to the main base 10. By aligning the centers of the mounting holes 27 and the moving side center shaft mounting holes 37) with high accuracy, and polishing the V grooves of the fixed side center shaft mounting base 20 and the moving side center shaft mounting base 30, X And the Z direction can be aligned at the same time. As a result, even after the fixed side center shaft mounting base 20 and the moving side center shaft mounting base 30 are assembled to the main base 10, it is possible to secure high position accuracy without mounting backlash.

Further, in the cylindrical grinding apparatus 100 of the present embodiment, the work 60, which is the object to be machined, is supported by the fixed side center shaft 21 and the moving side center shaft 31, and is provided on the central axis of the fixed side center shaft 21 and the moving side center shaft 31. Although it is rotated along the work, the fixed side center shaft 21 and the moving side center shaft 31 themselves are fixed to the mounting base (fixed side center shaft mounting base 20 and moving side center shaft mounting base 30) and do not rotate. The structure is such that the occurrence of misalignment due to the rotation of 60 can be reliably eliminated.

Also, since complicated centering adjustment when mounting the workpiece 60 on the fixed side center shaft 21 and the movable center shaft 31 is not required, it is Rukoto improve processing efficiency.

A work rotation mechanism 40 for rotating the work 60 along the central axis of the fixed side center shaft 21 and the moving side center shaft 31 is attached to the moving side center shaft mounting base 30.

The work rotation mechanism 40 rotates the drive side pulley 44 via the drive side timing pulley 42 and the drive side timing belt 43 by manually turning the rotation handle 41 arranged on the side surface of the moving side center shaft mounting base 30. , The rotating shaft 45 mounted at a position different from the mounting position of the moving side center shaft 31 is rotated. Further, the rotary shaft 45 is fixed is driven pulley 46, by the driven side pulley 46 is rotated together with the rotary shaft 45, via the driven-side timing belt 47 and the driven-side timing pulley 48, guide The structure is such that the portion 49 is rotated.

As a result, the rotary handle 41 is rotated so that the work 60 supported by the fixed side center shaft 21 and the moving side center shaft 31 rotates in the direction opposite to the rotation direction of the grindstone 50 , thereby forming the outer peripheral surface of the work 60. On the other hand, grooving is performed.

According to the cylindrical grinding device 100 of the present embodiment configured as described above, the fixed side center shaft 21 and the moving side center shaft 31 that support the work 60 are mounted bases (fixed side center shaft mounting base 20, moving side center). Since it is fixed to the shaft mounting base 30) and does not rotate, the coaxiality between the fixed side center shaft 21 and the moving side center shaft 31 is ensured with high accuracy when the work 60 is rotated.

As a result, it is possible to reliably eliminate the occurrence of misalignment due to the rotation of the work 60. Therefore, for example, when grooving the outer circumference of the work 60, the groove has a high coaxiality and squareness with respect to the central axis of the work 60. Can be formed.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment and can be variously modified without departing from the gist thereof. Needless to say.

The work rotation mechanism 40 of the above-described embodiment employs a method of rotating the work 60 by manually rotating the rotation handle 41, but employs a method of rotating the work 60 using a rotation drive device such as a motor. You may.
In the above embodiment, the work 60 is supported by the fixed side center shaft 21 and the moving side center shaft 31, but the means for supporting the work 60 is not limited to the center shaft, for example, the fixed side scroll chuck. And the moving side scroll chuck may support the work 60.
However, when the work 60 is supported by the scroll chuck, it is troublesome that after grasping both ends of the work with claws, it is necessary to perform an adjustment work to eliminate centering by centering work using a test indicator or the like. A scroll chuck is preferable as the work supporting means.

The processing applied to the outer circumference of the work 60 is not limited to grooving, and may be screw processing or the like. Further, by holding the main base 10 itself at an oblique angle, it is possible to grind the outer circumference of the work 60 having a cylindrical shape into a tapered shape.

Although the cylindrical grinding machine 100 of the above embodiment is provided with a grindstone 50, the cylindrical grinding machine of the present invention is mounted on a work table of another grinding machine, for example, a surface grinding machine, and the surface grinding machine The outer circumference of the work may be ground by a grindstone provided in the work. This makes it possible to reduce the size and weight of the cylindrical grinding device of the present invention, save space, and reduce costs.

10 Main base 11 Rail groove 20 Fixed side center shaft mounting base (fixed side mounting base)
21 Fixed side center shaft (fixed side work support means)
22 Spring 23 Metal bush 24 Arm 25 Pinion gear 26 Rack 27 Fixed side center shaft mounting hole 30 Moving side center shaft mounting base (moving side mounting base)
31 Moving side center shaft (moving side work supporting means)
32 Guide pin 37 Moving side center shaft mounting hole 40 Work rotation mechanism 41 Rotating handle 42 Drive side timing pulley 43 Drive side timing belt 44 Drive side pulley 45 Rotating shaft 46 Driven side pulley 47 Driven side timing belt 48 Driven side timing pulley 49 Guide Part 50 Grindstone 60 Work 100 Cylindrical grinding device

Claims (5)

The fixed side mounting base and the moving side mounting base arranged opposite to each other on the main base,
A fixed-side work supporting means that is mounted on the fixed-side mounting base and has a fixed-side center shaft that supports one end of a work having a cylindrical shape.
A moving side center shaft that is mounted on the moving side mounting base and supports the other end of the work, and is fixed to the moving side center shaft mounting hole coaxial with the moving side center shaft at a position without play. A moving side work supporting means equipped with a moving side center shaft ,
A work rotation mechanism that rotates the work mounted on the moving side mounting base and gripped by the fixed side center shaft and the moving side center shaft.
It is a cylindrical grinding machine equipped with
The work rotation mechanism includes a rotary handle, a timing pulley and a timing belt connected to the rotary handle, and a guide portion. When the rotary handle is rotated, the fixed side center shaft is attached to the fixed side. The timing pulley rotates around a rotation axis different from the axis related to the moving side center shaft without being fixed to the base and rotating and the moving side center shaft is fixed to the moving side mounting base and does not rotate. A cylindrical grinding apparatus characterized in that the guide portion is configured to rotate the work through the timing pulley and the timing belt to perform machining having a high degree of coaxiality with respect to the central axis of the work . The cylindrical grinding apparatus according to claim 1, wherein the processing of the outer peripheral surface of the work is any one of grooving, screwing, and grinding. The contact surface between the main base and the fixed side mounting base and the contact surface between the main base and the moving side mounting base have a trapezoidal shape on the main base side, and the fixed side mounting base side and the moving side mounting. The cylindrical grinding apparatus according to claim 1 or 2, wherein the base side has a V-groove shape. The cylindrical grinding apparatus according to any one of claims 1 to 3, further comprising a grindstone for processing the outer peripheral surface of the work supported by the fixed side work supporting means and the moving side work supporting means. .. The cylindrical grinding apparatus according to any one of claims 1 to 4, wherein the fixed-side work supporting means is a fixed-side center shaft, and the moving-side work supporting means is a moving-side center shaft.

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