JP6904181B2 - Inner diameter machining tool - Google Patents

Description

The present invention relates to an inner diameter machining tool.

An inner diameter machining tool that grinds the inner surface of a hole by rotating in the hole of the object to be machined is known. In such an inner diameter machining tool, a flow path for injecting cooling water for cooling the machined portion during machining and a flow path for injecting air for measuring the inner diameter of the hole during non-machining are individually formed. Is known. The flow path for cooling water and the flow path for air are formed at positions separated in the radial direction of the inner diameter processing tool. A rotary joint may be used to supply cooling water or air to such an inner diameter machining tool (see, for example, Patent Document 1). The rotary joint comprises a housing and a rotating shaft that is rotatably arranged relative to the housing and to which an inner diameter machining tool is connected. On the rotating shaft of the rotary joint, a flow path for cooling water and a flow path for air are individually formed so as to communicate with the flow path for cooling water and the flow path for air of the inner diameter processing tool. ing. The cooling water flow path and the air flow path formed on the rotating shaft of the rotary joint are also located at positions separated in the radial direction in the same manner as the cooling water flow path and the air flow path of the inner diameter processing tool. It is formed.

WO2009-013912

When the rotary joint is used as described above, the total axial length of the rotary shaft of the rotary joint and the inner diameter machining tool becomes long. Therefore, the rigidity of these as a whole may decrease. As a result, the center of rotation of the inner diameter machining tool may not be stable during machining, and the machining accuracy may decrease.

Therefore, an object of the present invention is to provide an inner diameter machining tool capable of cooling a machined portion and measuring the dimension of the inner diameter of a hole while suppressing a decrease in hole machining accuracy.

The above object is an inner diameter machining tool that grinds the inner surface of the hole by rotating in the hole of the object to be machined, and has a main body having a blade and a tip to the tip on the rotation center axis of the main body. A first flow path that extends to the side and is supplied with air for measuring the inner diameter of the hole during non-processing from the base end side and cooling water is supplied from the base end side during processing, and the first flow path. A second flow path extending radially outward from the flow path and opening on the outer peripheral surface of the main body portion, and a third flow path extending from the first flow path or the second flow path toward the tip end side of the main body portion. , The fourth flow path extending radially outward from the third flow path and opening to the outer peripheral surface of the main body, and the third or fourth flow even when the pressure of the air is received from the upstream side. By an inner diameter machining tool provided with an on-off valve that keeps the path closed and opens the third or fourth flow path by receiving the pressure of the cooling water that is larger than the pressure of the air from the upstream side. Can be achieved.

The first flow path is shared as a flow path for cooling water and a flow path for air, and extends from the base end to the tip side on the rotation center axis of the main body. Therefore, since it is sufficient that the cooling water and the air can be selectively supplied to the first flow path, the cooling water and the air can be supplied to the inner diameter machining tool without using the rotary joint. As a result, it is possible to suppress a decrease in hole machining accuracy, cool the machined portion, and measure the inner diameter of the hole.

According to the present invention, it is possible to provide an inner diameter machining tool capable of cooling a machined portion and measuring the dimension of the inner diameter of a hole while suppressing a decrease in hole machining accuracy.

FIG. 1 is an explanatory view of an inner diameter machining tool. FIG. 2A is an enlarged view of an on-off valve with the third flow path closed, and FIG. 2B is an enlarged view of the on-off valve with the third flow path open.

FIG. 1 is an explanatory view of the inner diameter machining tool 1. The inner diameter machining tool 1 is a tool for grinding the inner surface of a hole by rotating in the hole of the object to be machined. A spindle 40 is connected to the proximal end side of the inner diameter machining tool 1, a motor 50 is connected to the proximal end side of the spindle 40, and a joint portion 60 is connected to the proximal end side of the motor 50. The rotational power of the motor 50 is transmitted to the inner diameter machining tool 1 via the spindle 40, whereby the inner diameter machining tool 1 is rotated at high speed about its central axis C. The spindle 40, the motor 50, and the joint portion 60 are arranged so that their central axes coincide with the central axis C of the inner diameter machining tool 1. The inner diameter processing tool 1 is used for, for example, boring processing and honing processing.

The inner diameter machining tool 1 will be described. The main body 10 of the inner diameter machining tool 1 has a base end portion 11, a tip end portion 12, and an outer peripheral surface 13. A plurality of blade portions 18 for grinding the inner surface of the hole are fixed to the outer peripheral surface 13 at intervals in the circumferential direction. A flow path 20 is formed in the main body 10. The flow path 20 includes a first flow path 21, a second flow path 23, a third flow path 25, and a fourth flow path 27. The first flow path 21 extends from the end surface of the base end portion 11 to the vicinity of the center of the main body portion 10 on the tip end portion 12 side on the central axis C. Since the first flow path 21 is formed on the central axis C, which is the center of rotation of the inner diameter machining tool 1, the radial position of the first flow path 21 does not substantially change due to the rotation of the inner diameter machining tool 1. The second flow path 23 extends radially outward from the tip end side of the first flow path 21 and opens at the outer peripheral surface 13. The third flow path 25 extends from the first flow path 21 to the tip end portion 12 side halfway through the main body portion 10. As will be described in detail later, an on-off valve 30 is provided in the third flow path 25. The fourth flow path 27 extends radially outward from the tip end side of the third flow path 25 and opens at the outer peripheral surface 13. The blade portion 18 is fixed in the vicinity of the opening of the fourth flow path 27.

Cooling water for cooling the machined portion flows through the flow path 20 via the joint portion 60, the motor 50, and the spindle 40, and for measuring the inner diameter of the hole of the object to be machined during non-machining. Air circulates. Since the cooling water is sprayed from the second flow path 23 and also from the fourth flow path 27 opened in the vicinity of the blade portion 18, the machined portion can be appropriately cooled. The air for measurement is injected through a part of the flow path 20 in the hole of the object to be machined when the rotation of the inner diameter machining tool 1 is stopped and is not machined. The details will be described later, but based on the flow rate of this air. The inner diameter of the hole is measured.

The on-off valve 30 is provided on the third flow path 25 as described above, and is the third when nothing is supplied into the flow path 20 or when the above-mentioned measurement air is supplied. The flow path 25 is maintained in a closed state. As a result, when air for measurement is supplied into the flow path 20, the air does not flow through the third flow path 25 and the fourth flow path 27, but the first flow path 21 and the second flow path 23. Is circulated and injected to the outside of the inner diameter machining tool 1. When the cooling water is supplied to the flow path 20, the cooling water flows through the first flow path 21 and the second flow path 23, and the on-off valve 30 opens the third flow path 25 by the pressure of the cooling water. It circulates through the third flow path 25 and the fourth flow path 27. That is, the cooling water is injected from the second flow path 23 and the fourth flow path 27 to the outside of the inner diameter machining tool 1. Cooling water and air are selectively supplied to the first flow path 21 opened at the end surface of the base end portion 11 via the joint portion 60, the motor 50, and the spindle 40.

Next, the spindle 40, the motor 50, and the joint portion 60 will be described. In FIG. 1, the spindle 40, the motor 50, and the joint portion 60 are shown in cross section for easy understanding. First, the spindle 40 will be described. The spindle 40 has a shaft portion 41 fixed to the base end portion 11 and a cylindrical portion 43 arranged on the outer side in the circumferential direction of the shaft portion 41. A bearing 44 that allows the shaft portion 41 to rotate with respect to the cylindrical portion 43 is interposed between the shaft portion 41 and the cylindrical portion 43. As the shaft portion 41 rotates with respect to the cylindrical portion 43, the base end portion 11 also rotates, and the inner diameter machining tool 1 rotates. The shaft portion 41 is formed with a flow path 42 extending on the central axis C and communicating with the first flow path 21.

The motor 50 has a rotor 51 and a coil 53 arranged on the outer peripheral side of the rotor 51. The base end of the shaft portion 41 is fixed to the tip of the rotor 51. A plurality of magnets are fixed to the outer peripheral portion of the rotor 51. The coil 53 is wound around a stator arranged outside the rotor 51. When the coil 53 is energized, the stator is excited, and the rotor 51 is rotated by the magnetic force generated between the stator and the magnet. The rotor 51 is formed with a flow path 52 that extends on the central axis C and communicates with the flow path 42.

The joint portion 60 has a fixed support portion 61 that rotatably supports the rotor 51. The inner diameter of the fixed support portion 61 on the distal end side is formed to be larger than the outer diameter on the proximal end side of the rotor 51. The tip end side of the fixed support portion 61 and the base end side of the rotor 51 are rotatably connected via a bearing 64. Further, a seal member 63 for preventing leakage of cooling water and measurement air is arranged between the fixed support portion 61 and the rotor 51. The fixed support portion 61 is formed with a flow path 62 that extends on the central axis C and communicates with the first flow path 21.

A cooling water supply source 81 and an air supply source 82 are connected to the flow path 62 of the joint portion 60 via a switching valve 80. The switching valve 80 regulates the supply of cooling water from the cooling water supply source 81 to the flow paths 62, 52, 42, and 20, and regulates the supply of air from the air supply source 82 to the flow paths 62, 52, 42, and 20. Cooling from the cooling water supply source 81 to the flow paths 62, 52, 42, and 20 by restricting the supply of air from the air supply source 82 to the flow paths 62, 52, 42, and 20 and the state where the supply is permitted. It can be switched to a state that allows the supply of water, for example, a three-way valve. The switching valve 80 is controlled by a control device 84 described later.

Next, the procedure for measuring the inner diameter of the hole of the object to be machined with the measuring air will be described. After stopping the rotational drive of the spindle connected to the base end portion 11 side of the inner diameter machining tool 1, a measurement command is output from the NC device 86 to the sequencer 85, and a measurement command signal is output from the sequencer 85 to the control device 84. Then, the control device 84 starts controlling the switching valve 80, the cooling water supply source 81, and the air supply source 82. Specifically, the supply of cooling water from the cooling water supply source 81 to the flow path 20 via the joint portion 60, the motor 50, and the spindle 40 is stopped, and the switching valve 80 stops the supply of the cooling water from the cooling water supply source 81 to the flow path. The state is switched to a state in which the supply of cooling water to the 20 is regulated and the supply of air from the air supply source 82 to the flow path 20 is permitted, and air is supplied from the air supply source 82 to the flow path 20 via the joint portion 60. Will be done. Here, as described above, the on-off valve 30 allows air to flow through the first flow path 21 and the second flow path 23 and to be injected from the second flow path 23. At this time, the A / E converter 83 detects the back pressure of air, converts these detection signals into digital signals, and outputs them to the control device 84. The control device 84 obtains the air flow rate from the pressure detection signal output from the A / E converter 83, and is based on the data showing the relationship between the air flow rate, the air flow rate stored in advance, and the inner diameter of the hole. The inner diameter of the hole of the object to be machined is measured.

As described above, the inner diameter machining tool 1 is formed with the first flow path 21 in which the air flow path and the cooling water flow path are shared. Therefore, cooling water and air can be selectively supplied to the inner diameter machining tool 1 without using the rotary joint. Therefore, as compared with the case of using the rotary joint, the axial length of the entire member that rotates integrally, that is, the overall axial length of the inner diameter machining tool 1 in this embodiment is shorter. As a result, the overall rigidity can be ensured, and the center of rotation of the inner diameter machining tool 1 during machining can be stabilized. Therefore, a decrease in machining accuracy, specifically, the roundness and straightness of the hole is suppressed.

Here, for example, a double pipe structure including an inner pipe through which one of air and cooling water flows and an outer pipe arranged outside the inner pipe and through which the other of air and cooling water flows is provided in the inner diameter processing tool 1. It is also conceivable to provide it along the central axis C. However, by adopting the double pipe structure, there is a concern that the manufacturing cost will increase and the durability will decrease. In particular, when the pressure difference between air and cooling water is large, there is a possibility that the manufacturing cost will increase if an attempt is made to adopt a double pipe structure that can withstand such a pressure difference. Since it is not necessary to adopt such a double pipe structure in the flow path 20 of the inner diameter machining tool 1 of this embodiment, an increase in manufacturing cost and a decrease in durability are suppressed.

Next, the on-off valve 30 will be described in detail. 2A and 2B are enlarged views around the on-off valve 30. FIG. 2A is an enlarged view of the on-off valve 30 in which the third flow path 25 is closed, and FIG. 2B is an enlarged view of the on-off valve 30 in which the third flow path 25 is opened. The on-off valve 30 is housed in a storage chamber 25h in which the inner diameter of the third flow path 25 is partially expanded. The on-off valve 30 has a valve body 31, a spring 33, and a seal member 35. The valve body 31 has a flange portion 311 having an outer diameter larger than the inner diameter of the third flow path 25 in a portion other than the storage chamber 25h, and a flange portion 311 having a smaller outer diameter than the flange portion 311 in the thickness direction of the flange portion 311. Includes a body 313 that is longer than the thickness. The flange portion 311 is located on the upstream side, and the body portion 313 is arranged in the storage chamber 25h so as to be located on the downstream side. The spring 33 is a coil-shaped spring and is arranged between the downstream end of the storage chamber 25h and the flange portion 311 of the valve body 31 so that the valve body 31 faces the first flow path 21 side. I'm urging. Further, the seal member 35 is arranged between the flange portion 311 and the upstream end portion of the storage chamber 25h, and is made of elastic rubber to ensure airtightness.

Even when no pressure is applied to the valve body 31 from the upstream side or when air for measurement is supplied to the first flow path 21 and acts on the valve body 31, the spring is as shown in FIG. 2A. The valve body 31 is brought into close contact with the seal member 35 by the urging force of 33, and the third flow path 25 is maintained in a closed state. That is, it is regulated that air flows to the downstream side of the on-off valve 30. On the other hand, when the cooling water is supplied to the first flow path 21 and acts on the valve body 31, the cooling water resists the urging force of the spring 33 so that the valve body 31 separates from the seal member 35. It moves to the downstream side, and as shown in FIG. 2B, the third flow path 25 is in an open state. As a result, the cooling water is allowed to flow to the downstream side of the on-off valve 30. The pressure of the air for measurement is, for example, 0.2 MPa, and the pressure of the cooling water is, for example, 2 to 5 MPa. Further, the length of the valve body 31 and the urging force of the spring 33 are set so that the downstream end of the valve body 31 does not block the third flow path 25 even when the pressure of the cooling water is applied. ing. In this way, the opening / closing state of the on-off valve 30 is switched according to the pressure of the fluid supplied to the first flow path 21.

Here, at the time of processing, the cooling water flows to the second flow path 23 in addition to the first flow path 21. Therefore, the temperature rise in the first flow path 21 and the second flow path 23 during processing is also suppressed. As a result, it is possible to suppress the temperature change of the air passing through the first flow path 21 and the second flow path 23 during non-processing. As a result, it is possible to suppress an error in measuring the dimensions of the inner diameter of the hole.

Although the examples of the present invention have been described in detail above, the present invention is not limited to such specific examples, and various modifications and modifications are made within the scope of the gist of the present invention described in the claims. It can be changed.

In the above embodiment, the on-off valve 30 is provided on the third flow path 25 to open and close the third flow path 25, but the present invention is not limited to this. Such an on-off valve may be provided on the fourth flow path 27 as long as it is possible to regulate the injection of measurement air from the fourth flow path 27. In this case, since the fourth flow path 27 extends from the third flow path 25 on both sides of the main body 10, it is necessary to provide on-off valves in each of the flow paths extending on both sides.

In the above embodiment, the first flow path 21 and the third flow path 25 are formed on substantially the same extension line, but the present invention is not limited to this. For example, the third flow path may communicate with the first flow path via the second flow path, and the third flow path may be formed at a position deviating from the extension line of the first flow path.

In the above embodiment, the fourth flow path 27 extends from the third flow path 25 to both sides of the main body 10, but the present invention is not limited to this. For example, the fourth flow path may extend from the third flow path 25 to only one side of the main body 10. Similarly, the second flow path 23 extends from the first flow path 21 to both sides of the main body 10, but the second flow path is not limited to this, and the second flow path is one side of the main body 10 from the first flow path 21. May extend only to.

1 Inner diameter machining tool 10 Main body 11 Base end 12 Tip 20 Flow path 21 1st flow path 23 2nd flow path 25 3rd flow path 27 4th flow path 30 On-off valve

Claims (1)

An inner diameter machining tool that grinds the inner surface of the hole by rotating in the hole of the object to be machined.
The main body with the blade and
Air extends from the base end to the tip end side on the rotation center axis of the main body portion, and air for measuring the dimension of the inner diameter of the hole is supplied from the base end side during non-processing, and cooling water is supplied from the base end side during processing. The first flow path supplied from
A second flow path extending radially outward from the first flow path and opening on the outer peripheral surface of the main body, and a second flow path.
A third flow path extending from the first flow path or the second flow path to the tip end side of the main body portion, and
A fourth flow path extending radially outward from the third flow path and opening on the outer peripheral surface of the main body, and a fourth flow path.
Even when the pressure of the air is received from the upstream side, the third or fourth flow path is maintained in a closed state, and the pressure of the cooling water larger than the pressure of the air is received from the upstream side. An inner diameter machining tool including an on-off valve that opens the third or fourth flow path.

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