JP2007083323A - Method of grinding cylindrical internal surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of grinding a cylindrical internal surface, which method can accurately grind the cylindrical internal surface formed in a workpiece. <P>SOLUTION: The method of grinding the cylindrical internal surface uses a grinding apparatus 1 provided with a bed 10 for supporting a main spindle portion 2 which holds a workpiece 5 and rotates, a grinding wheel spindle portion 3 which holds a grinding wheel 4 and rotates, base portions 6-1, 6-2 for movably supporting the grinding wheel spindle portion 3 and the main spindle portion 2, a linear drive portion 7 for relatively moving the grinding wheel spindle portion 3 and the main spindle portion 2, a main spindle driving portion 8 for rotating the main spindle portion 2, and a grinding wheel driving portion 9 for rotating the grinding wheel spindle portion 3. Further, in a first method for grinding the cylindrical internal surface, the rotational central axis 11 of the main spindle portion 2 and the rotational central axis 12 of the grinding wheel spindle portion 3 are arranged so as to cross to make a required angle. In addition, in a second method for grinding the cylindrical internal surface, the rotational central axis 11 of the main spindle portion 2 and the rotational central axis 12 of the grinding wheel spindle portion 3 are arranged so as to be parallel with each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylindrical inner peripheral surface grinding method for grinding a cylindrical inner peripheral surface formed on a workpiece with high accuracy.

  In the conventional cylindrical inner peripheral surface grinding method, using a mounting screw provided in the main spindle portion of the grinding apparatus, the workpiece is held on the main spindle portion, and the workpiece is rotated along with the rotation of the main spindle portion. Using a mounting screw provided in the tool shaft portion, the grindstone is held on the tool shaft portion and is rotated together with the rotation of the tool shaft portion.

  In the above-described method of attaching the workpiece and the grindstone and grinding the inner peripheral surface in the rotating state, the grinding incision amount is gradually increased while moving the grindstone and the workpiece in the axial direction of each other. In addition, the inner peripheral surface grinding was performed by repeating the reciprocating movement of the grindstone and the workpiece. Further, in such a conventional inner peripheral surface grinding method, as shown in FIG. 7, the main shaft and the tool shaft of the grinding device are arranged so that their center axes are parallel to each other, and the grindstone having a uniform diameter is used. Is used.

  However, in the inner peripheral surface grinding method using the grinding device having the above-described conventional configuration, grinding is performed by reciprocating the grindstone and the workpiece by adding a small amount of grinding incision and repeating this reciprocation. In order to process, there existed a problem that it took very much time to grind a workpiece.

JP-A-8-281540 JP-A-11-262845

  In view of the above situation, the present invention provides an inner peripheral surface grinding method capable of performing rough grinding to finish grinding in a short time.

  In order to solve the problem, the first inner peripheral surface grinding method of the present invention includes a main shaft portion 2 that rotates while holding the workpiece 5, a tool shaft portion 3 that rotates while holding the grindstone 4, Base portions 6-1 and 6-2 that support the tool shaft portion 3 and the main shaft portion 2 movably, a linear drive unit 7 that relatively moves the tool shaft portion 3 and the main shaft portion 2, and the main shaft portion 2 Is performed using a grinding apparatus 1 including a main body 10 that supports a spindle driving unit 8 that rotates the tool shaft 9 and a tool driving unit 9 that rotates the tool shaft unit 3. The rotation center shaft 11 and the rotation center shaft 12 of the tool shaft portion 3 are arranged so as to intersect each other at a predetermined angle, and the tool shaft portion 3 and the main shaft portion 2 are covered in a direction away from each other. This is a method that employs grinding the inner peripheral surface of the workpiece 5.

  Furthermore, another inner peripheral surface grinding method of the present invention is a method performed using the same grinding device 1 as the first method, and further includes a rotation center shaft 11 of the main shaft portion 2 and a tool. The rotation center shaft 12 of the shaft portion 3 is arranged in parallel to each other, and the tool shaft portion 3 and the main shaft portion 2 grind the inner peripheral surface of the workpiece 5 in a direction away from each other. It is a method to adopt.

  The grindstone 4 used in the first cylindrical inner peripheral surface grinding method of the present invention includes the tip grindstone portion 4-1 on the main shaft portion 2 side and the grindstone mounting end 3-1 side mounting end of the tool shaft portion 3. The tool shaft portion 3 includes the grindstone having the same diameter from the tip portion grindstone portion 4-1 to the attachment end grindstone portion 4-2.

  The grindstone 4 used in the first and second cylindrical inner peripheral surface grinding methods of the present invention is such that the particle size of the tip grindstone portion 4-1 on the main shaft portion 2 side is the grindstone mounting end of the tool shaft portion 3. It is a two-layer structure different from the grain size of the 3-1 side mounting end grindstone portion 4-2.

  In the second cylindrical inner peripheral surface grinding method of the present invention, the grindstone 4 is attached to the tip grindstone portion 4-1 on the main shaft portion 2 side and the grindstone mounting end 3-1 side of the tool shaft portion 3 side. The tip portion 4-1 of the tip portion 4-1 having the same diameter as the tool shaft portion 3 is parallel to the cylindrical inner peripheral surface of the workpiece 5 and the grindstone mounting end 3-1 of the tool shaft portion 3. A grindstone 4 having a tapered attachment end grindstone portion 4-2 whose diameter decreases in the direction is provided.

  In the second cylindrical inner peripheral surface grinding method of the present invention described above, rough grinding is performed with the tapered tip portion grindstone portion 4-1 of the grindstone 4, and the mounting end grindstone of the same diameter portion of the grindstone 4 is used. Finish grinding is performed at part 4-2.

  Further, in the first and second cylindrical inner peripheral surface grinding methods of the present invention, the rotation speed of the main shaft portion 2 holding the workpiece 5 is 330 to 110 rpm, and the rotation of the tool shaft portion 3 holding the grindstone 4 is rotated. Grinding under grinding conditions such that the number is 24,000 to 8000 rpm, the feed speed of the tool shaft portion 3 holding the grindstone 4 is 15 to 5 mm / min, and the cutting amount of the grindstone 4 to the workpiece 5 is 450 to 150 μm / pass To do.

  One cylindrical inner peripheral surface grinding method according to the present invention is, in particular, arranged such that a rotation center axis of a main shaft portion of a grinding apparatus and a rotation center axis of a tool shaft portion intersect each other and form a predetermined angle, and grinding. The workpiece is ground in the direction of the cylinder shaft and the spindle portion of the processing device away from each other, and the grindstone used has the same diameter from the tip grindstone portion to the mounting end grindstone portion. Since the configuration is provided, it is possible to greatly increase the overall grinding conditions combining the rotational speed of the main shaft portion, the rotational speed of the tool shaft portion, the feed speed of the grindstone, and the cutting amount of the grindstone.

  Accordingly, the cylindrical inner peripheral surface grinding method using the grinding apparatus having the above-described configuration according to the present invention can perform the workpiece to finish processing by one moving grinding process, and the inner peripheral surface cylindrical in a short time. A processable inner peripheral surface grinding method can be provided.

  Furthermore, in another cylindrical inner peripheral surface grinding method of the present invention, in particular, the rotation center axis of the main shaft portion of the grinding device and the rotation center axis of the tool shaft portion are arranged in parallel to each other, and the tool axis of the grinding device is The workpiece is ground on the inner circumferential surface of the workpiece in a direction in which the head portion and the main shaft portion are separated from each other, and the grindstone used decreases in diameter from the main shaft portion side toward the grindstone mounting end of the tool shaft portion. Since the structure having the taper shape is provided, it is possible to greatly increase the overall grinding conditions combining the rotation speed of the main shaft portion, the rotation speed of the tool shaft portion, the feed speed of the grindstone, and the cutting amount of the grindstone.

  Accordingly, the cylindrical inner peripheral surface grinding method using the grinding apparatus having the above-described configuration according to the present invention can perform the workpiece to finish processing by one moving grinding process, and the inner peripheral surface cylindrical in a short time. A processable inner peripheral surface grinding method can be provided.

  The cylindrical inner peripheral surface grinding method of the present invention can use a conventional grinding device having at least the following configuration. That is, a grinding apparatus 1 used in the first inner peripheral surface grinding method of the present invention includes a main spindle 2 that holds and rotates a workpiece 5, a main spindle drive 8 that rotates the main spindle 2, and A tool shaft 3 that holds and rotates the grindstone 4, a tool drive unit 9 that rotates the tool shaft 3, a base 6-1 and 6-2 that are movable, and a tool shaft 3, It includes a main body 10 that supports a linear drive unit 7 that relatively moves the main shaft unit 2.

  Furthermore, in the grinding apparatus 1 used in the first method of the present invention, the rotation center shaft 11 of the main shaft portion 2 and the rotation center shaft 12 of the tool shaft portion 3 are arranged so as to intersect each other and form a predetermined angle. In addition, the workpiece 5 is subjected to a cylindrical inner peripheral grinding process in a direction in which the tool shaft portion 3 and the main shaft portion 2 are separated from each other. Furthermore, the grindstone 4 used in the first inner peripheral surface grinding method of the present invention includes a front end grindstone portion 4-1 and an attached end grindstone portion 4- parallel to the cylindrical inner peripheral surface of the workpiece 5 and having the same diameter. 2 is used.

  The first cylindrical inner peripheral surface grinding method of the present invention has the above-described configuration, that is, the rotation center axis of the main shaft portion and the rotation center axis of the tool shaft portion form a predetermined angle, and the tool shaft portion Grinding can be performed in a direction in which the main shaft part is separated, and creep feed grinding (relatively slow feed rate with a large cutting amount) can be performed by moving in the axial direction in one step. Furthermore, rough grinding and finish grinding can be performed by one-step grinding.

Furthermore, the grinding apparatus 1 used in the second inner peripheral surface grinding method of the present invention uses the first grinding apparatus 1, but the configuration shown below is different.
That is, in the grinding device 1 used in the second inner peripheral surface grinding method of the present invention, the rotation center shaft 11 of the main shaft portion 2 and the rotation center shaft 12 of the tool shaft portion 3 are arranged in parallel to each other, and The workpiece 5 is subjected to a cylindrical inner peripheral surface grinding process in a direction in which the tool shaft portion 3 and the main shaft portion 2 are separated from each other. Furthermore, the grindstone 4 used in the second inner peripheral surface grinding method of the present invention includes a tip grindstone portion 4-1 that is parallel to the cylindrical inner peripheral surface of the workpiece 5 and has the same diameter, and the tool shaft portion 3. A grindstone having a tapered attachment end grindstone portion 4-2 whose diameter decreases in the direction of the grindstone attachment end 3-1.

  The second cylindrical inner peripheral surface grinding method of the present invention uses the apparatus and the grindstone configured as described above, that is, the rotation center axis of the main shaft portion and the rotation center axis of the tool shaft portion form a predetermined angle, By using the grindstone 4 that is ground in the direction in which the tool shaft portion and the main shaft portion are separated and has the tip portion grindstone portion 4-1 and the tapered attachment end grindstone portion 4-2 of the same diameter, Creep feed grinding (relatively slow feed rate with a large cutting depth) is possible by moving in the axial direction. Furthermore, rough grinding and finish grinding can be performed by one-step grinding.

An embodiment of the cylindrical inner peripheral surface grinding method of the present invention will be described below with reference to the drawings.
Example 1
The inner peripheral surface grinding method according to the first embodiment of the present invention uses the grinding device 1 shown in FIG. The grinding device 1 used in the inner peripheral surface grinding method of the present invention includes a main shaft portion 2 that rotates while holding a workpiece 5, a tool shaft portion 3 that rotates while holding a grindstone 4, and a tool shaft portion. Base portions 6-1 and 6-2 that movably support the main shaft portion, a linear drive portion 7 that relatively moves the tool shaft portion and the main shaft portion, a main shaft drive portion 8 that rotates the main shaft portion, A main body 10 that supports a tool driving section 9 that rotates the tool shaft section is provided.

  Further, as shown in FIG. 2, the grinding apparatus 1 is arranged such that the rotation center shaft 11 of the main shaft portion and the rotation center shaft 12 of the tool shaft portion intersect with each other at a predetermined angle, and the tool The workpiece 5 is subjected to a cylindrical inner peripheral surface grinding process in a direction in which the shaft portion and the main shaft portion are separated from each other.

  Further, as shown in FIGS. 2 and 6, the grindstone used in the inner peripheral surface grinding method according to the first embodiment having the above-described configuration of the present invention includes a tip grindstone portion 4-1 on the main shaft side and a tool shaft portion. And the mounting end grindstone portion 4-2 on the side of the grindstone mounting end 3-1, and the tool shaft has the same diameter from the tip end grindstone portion 4-1 to the mounting end grindstone portion 4-2. Furthermore, as shown in FIG. 6, the grindstone used in the inner peripheral surface grinding method according to the second embodiment having the above-described configuration of the present invention is such that the grain size of the tip grindstone portion 4-1 on the main shaft side is that of the tool shaft portion. The two-layer structure is finer than the grain size of the mounting end grinding wheel portion 4-2 on the side of the grinding wheel mounting end 3-1.

  In the inner peripheral surface grinding method according to the first embodiment having the above-described configuration of the present invention, by adopting the above-described means, that is, in particular, the rotation center axis of the main shaft portion and the rotation center axis of the tool shaft portion have a predetermined angle. By performing processing in the direction in which the tool shaft portion and the main shaft portion are separated from each other, creep feed grinding (relatively slow feed speed with a large cutting amount) can be performed by a single axial movement process.

  Furthermore, as shown in FIG. 6, the grindstone used in the inner peripheral surface grinding method according to the first embodiment having the above-described configuration of the present invention is such that the grain size of the tip grindstone portion 4-1 on the main shaft portion side is the tool shaft portion. Because of the two-layer structure that is finer than the grain size of the mounting end grinding wheel portion 4-2 on the side of the grinding wheel mounting end 3-1, the rough grinding process and the finish grinding process can be performed by a single axial movement process. This makes it possible to shorten the grinding time.

Example 2
The inner peripheral surface grinding method according to the second embodiment of the present invention uses the grinding device 1 shown in FIG. Furthermore, as shown in FIG. 3, the grinding apparatus 1 used in Embodiment 2 of the present invention has a rotation center shaft 11 of the main shaft portion and a rotation center shaft 12 of the tool shaft portion arranged in parallel to each other, and the tool The workpiece 5 is subjected to a cylindrical inner peripheral surface grinding process in a direction in which the shaft portion and the main shaft portion are separated from each other.

  Moreover, as shown in FIGS. 3, 4 and 5, the grindstone used in the inner peripheral surface grinding method according to the second embodiment having the above-described configuration of the present invention is the tip grindstone portion 4-1 on the spindle side. It has a two-layer structure in which the particle size is finer than the particle size of the mounting end grindstone portion 4-2 on the grindstone mounting end 3-1 side of the tool shaft.

  Furthermore, the grindstone used in the inner peripheral surface grinding method of Example 2 having the above-described configuration of the present invention is the tip grindstone portion 4-1 on the main shaft portion 2 side and the grindstone mounting end 3-1 side of the tool shaft portion 3. The tip end grindstone portion 4-1 having the same diameter as the tool shaft portion 3 is parallel to the cylindrical inner peripheral surface of the workpiece 5 and the tool shaft portion 3 is attached to the grindstone. It has a taper-shaped attachment end grindstone portion 4-2 whose diameter decreases in the direction of the end 3-1.

  Furthermore, in the inner peripheral surface grinding method according to the second embodiment having the above-described configuration of the present invention, the grinding wheel 4 is roughly ground by the tapered mounting end grinding wheel portion 4-2 of the grinding stone 4, and the tip of the grinding stone 4 having the same diameter portion is used. Finish grinding is performed at the partial grinding wheel portion 4-1.

  In the inner peripheral surface grinding method according to the first and second embodiments having the above-described configuration of the present invention, the rotational speed of the main shaft portion that holds the workpiece is set in the range of 330 to 110 rpm.

  Moreover, in each Example of this invention, let the rotation speed of the tool axial part holding a grindstone be the range of 24000-8000 rpm. The rotational speed of the tool shaft holding the grindstone is about 24000 rpm at the fastest when the workpiece is a copper alloy such as brass, an aluminum alloy such as duralumin, and a free-cutting material such as cast iron. Further, when the workpiece is a hard material such as steel and special steel, and a soft material such as copper and aluminum, the speed is about 8000 rpm at the latest. The most preferred tool shaft revolution for each free-cutting material, hard material and soft material is about 1600 rpm.

  Moreover, in the inner peripheral surface grinding method of Example 1 and Example 2, the feed rate of the tool shaft part holding the grindstone is in the range of 15 to 5 mm / min. The feed rate of the tool shaft is about 10 mm / min.

  Furthermore, in the inner peripheral surface grinding method of Example 1 and Example 2, the cutting amount of the grindstone into the workpiece is set in the range of 450 to 150 μm / pass. The cutting amount of the grindstone into the workpiece is about 300 μm / pass.

  The present invention provides an inner peripheral surface grinding method for grinding in a short time and with high accuracy by grinding a cylindrical inner peripheral surface of a workpiece in one step of roughing and finishing. Can contribute to the field that requires high-precision grinding in a short time.

It is a top view which shows typically the grinding processing apparatus used for the cylindrical internal peripheral surface grinding method of this invention. It is explanatory drawing of the internal peripheral surface grinding method which is one Example of this invention. It is explanatory drawing of the internal peripheral surface grinding method which is another Example of this invention. It is a top view which shows the taper-shaped grindstone of this invention. It is a top view which shows the state which grinds a to-be-processed object using the taper-shaped grindstone of this invention. It is a top view which shows the state which grinds a workpiece using the grindstone of the same diameter of this invention. It is explanatory drawing of the conventional internal peripheral surface grinding method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding machine 2 Main shaft part 3 Tool shaft part 3-1 Grinding wheel attachment end part of tool shaft part 4 Grinding stone 4-1 Tip part grinding wheel part 4-2 Attachment end grinding wheel part 5 Workpiece 6-1 and 6-2 Base Part 7 Linear drive part 8 Spindle drive part 9 Tool drive part 10 Main body 11 Rotation center axis of spindle part 12 Rotation center axis of tool axis part

Claims (7)

A main shaft portion (2) that rotates while holding the workpiece (5), a tool shaft portion (3) that rotates while holding the grindstone (4), the tool shaft portion (3), and the main shaft portion (2 ) In a movable manner, a linear drive unit (7) for relatively moving the tool shaft (3) and the main shaft (2), Grinding apparatus comprising a main body (10) for supporting a main shaft drive section (8) for rotating the main shaft section (2) and a tool drive section (9) for rotating the tool shaft section (3). 1) A cylindrical inner peripheral surface grinding method using
The rotation center axis (11) of the main shaft portion (2) and the rotation center axis (12) of the tool shaft portion (3) are arranged to intersect each other at a predetermined angle, and the tool shaft portion (3) and the main shaft portion (2) grind the inner peripheral surface of the workpiece (5) toward a direction away from each other.
A method for grinding a cylindrical inner peripheral surface. A main shaft portion (2) that rotates while holding the workpiece (5), a tool shaft portion (3) that rotates while holding the grindstone (4), the tool shaft portion (3), and the main shaft portion (2 ) In a movable manner, a linear drive unit (7) for relatively moving the tool shaft (3) and the main shaft (2), Grinding apparatus comprising a main body (10) for supporting a main shaft drive section (8) for rotating the main shaft section (2) and a tool drive section (9) for rotating the tool shaft section (3). 1) A cylindrical inner peripheral surface grinding method using
The rotation center axis (11) of the main shaft portion (2) and the rotation center axis (12) of the tool shaft portion (3) are arranged in parallel to each other, and the tool shaft portion (3) and the main shaft The part (2) and the workpiece (5) are subjected to a cylindrical inner peripheral grinding process in a direction away from each other.
A method for grinding a cylindrical inner peripheral surface. The grindstone includes a tip grindstone portion (4-1) on the main shaft portion (2) side and a grindstone portion (4-2) on the grindstone mounting end (3-1) side of the tool shaft portion. And the tool shaft (3) includes the grindstone having the same diameter from the tip grindstone portion (4-1) to the mounting end grindstone portion (4-2).
The cylindrical inner peripheral surface grinding method according to claim 1, wherein:   As for the said grindstone, the particle size of the front-end | tip part grindstone part (4-1) by the side of the said main spindle part (2) is the attachment end grindstone part (4-2) by the side of the said grindstone attachment end (3-1) of the said tool axial part. The cylindrical inner peripheral surface grinding method according to any one of claims 1 to 3, wherein the two-layer structure is different from the grain size of the cylindrical inner surface. The grindstone includes a tip grindstone portion (4-1) on the main shaft portion (2) side and a grindstone portion (4-2) on the grindstone mounting end (3-1) side of the tool shaft portion. And the tool shaft (3) is parallel to the cylindrical inner surface of the workpiece (5) and has the same diameter as the tip grindstone portion (4-1), and the tool shaft (3). The said grindstone (4) provided with the said attachment end grindstone part (4-2) of the taper shape whose diameter becomes small toward the direction of the said grindstone attachment end (3-1), It is characterized by the above-mentioned. The cylindrical inner peripheral surface grinding method according to 2 or 4.   Rough grinding is performed at the attached end grindstone portion (4-2) of the tapered shape of the grindstone, and finish grinding is performed at the tip grindstone portion (4-1) of the same diameter portion of the grindstone. The cylindrical inner peripheral surface grinding method according to any one of claims 2, 4, and 5.   The rotation speed of the main shaft holding the workpiece is 330 to 110 rpm, the rotation speed of the tool shaft holding the grindstone is 24,000 to 8000 rpm, the feed speed of the tool shaft holding the grindstone is 15 to 5 mm / min, and the workpiece The cylindrical inner peripheral surface grinding method according to any one of claims 1 to 6, wherein grinding is performed under a grinding condition in which a cutting amount of the grindstone into the workpiece is 450 to 150 µm / pass.

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