JPH077842U - Internal grinding machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the reduction of roundness and straightness due to the influence of the lateral hole of the workpiece without increasing the machining time. When a workpiece 23 having a lateral hole is machined, only the solenoid valve 35 is opened by a rough grinding open signal 37 from the control device 30 during rough grinding, and the rough grinding grinding signal set by the flow rate adjusting valve 33 is used. A flow rate of grinding fluid is supplied to the inside of the workpiece 23. On the other hand, during finish grinding, the control device 30
Only the solenoid valve 36 is opened by the finishing open signal 38 from the above, and the grinding fluid is supplied to the inside of the workpiece 23 at a flow rate for finish grinding set to be smaller than the flow rate for rough grinding by the flow rate adjusting valve 34. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inner surface grinder that grinds an inner surface of a workpiece with a grindstone.

[0002]

[Prior art]

 An internal grinding machine is one of the devices that perform grinding. As shown in FIG. 2, this inner surface grinding machine rotates both the workpiece 51 and the grindstone 52 so that the inner side of the workpiece 51 is narrower than the width of the workpiece 52 in the axial direction of the workpiece. Is traversed to grind the inner surface of the work piece 51.

By the way, in the case of a workpiece in which the machining width is longer than the inner diameter of the workpiece and the lateral hole is opened, the grinding resistance is reduced in the lateral hole portion, so that the periphery of the lateral hole portion is additionally shaved and the lateral hole portion is cut. The roundness may be poor and the straightness may be poor. Therefore, conventionally, in such a case, the rotation of the workpiece is slowed to reduce the influence of the lateral hole.

[0004]

[Problems to be solved by the device]

 However, when the rotation of the workpiece is slowed down, if the cutting depth per one rotation of the workpiece is made the same, the machining efficiency is reduced and the machining time becomes longer.

Further, as shown in FIG. 2, in particular, in the case of a small-diameter workpiece, since the machining width d is long, the grindstone shank 54 becomes long, the rigidity at the tip of the grindstone becomes small, and the grinding fluid required for rough grinding is If the flow rate is secured, as shown in FIG. 3, the grindstone 52 is pressed against the work piece 51 by the grinding fluid 55 during machining, and the bite of the grindstone 52 becomes deeper, so that the roundness and straightness are sufficiently improved. I couldn't.

Therefore, an object of the present invention is to provide an inner surface grinding machine capable of preventing a decrease in roundness and straightness due to an influence of a lateral hole of a workpiece without increasing a machining time.

[0007]

[Means for Solving the Problems]

 In the present invention, a holding means for rotatably holding a workpiece, a grindstone for grinding the inner surface of the workpiece, a grindstone rotating means for rotating the grindstone, and a grinding fluid for supplying a grinding fluid when grinding the workpiece. The liquid supply means and the flow rate switching means for switching the flow rate of the grinding fluid supplied by the grinding fluid supply means so that the flow rate of the grinding fluid during finish grinding becomes smaller than the flow rate of the grinding fluid during rough grinding. It is provided in an inner surface grinding machine to achieve the above object.

[0008]

[Action]

 In this internal grinding machine, the flow rate switching means controls the flow rate of the grinding fluid supplied by the grinding fluid supply means so that the flow rate of the grinding fluid during finish grinding becomes smaller than the flow rate of the grinding fluid during rough grinding. Can be switched.

By reducing the flow rate of the grinding fluid during finish grinding, bite of the grindstone can be suppressed.

[0010]

【Example】

 An embodiment of the inner surface grinding machine of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view showing the structure of an inner surface grinding machine according to an embodiment of the present invention.

The inner surface grinding machine of the present embodiment has a grindstone shaft 11 rotated by a motor (not shown), and a grindstone 13 is attached to a tip end portion of the grindstone shaft 11 via a grindstone shank 12. . Further, the grindstone shaft 11 is adapted to be moved back and forth in the axial direction by another motor (not shown).

The inner surface grinding machine has a main shaft 15, and the main shaft 15 is rotated by a motor 16 via a pulley 17, a belt 18 and a pulley 19. Further, the main shaft 15 is moved back and forth in a direction orthogonal to the axial direction by another motor (not shown). A cylindrical work piece 23 is fixed to the tip of the main shaft 15 via a spacer 21 and a work piece fixing claw 22. Some of the workpieces 23 have lateral holes formed therein.

Further, a grinding fluid passage (not shown) is formed in the center of the spindle 15, and the grinding fluid passage communicates with a grinding fluid supply port 26 of a rotary joint 25 provided at the rear end of the spindle 15. It is the same. The inner surface grinding machine includes a grinding fluid tank 27, a pump 28 for supplying the grinding fluid in the grinding fluid tank 27 to the grinding fluid supply port 26, and a control device 30 for controlling the entire inner surface grinding machine. have.

In the present embodiment, two lines of grinding liquid supply lines 31 and 32 are provided between the pump 28 and the grinding liquid supply port 26. The supply lines 31 and 32 are provided with flow rate adjusting valves 33 and 34 and electromagnetic valves 35 and 36, respectively. In response to the cutting speed command, the control device 30 sends a rough grinding open signal 37 to the solenoid valve 35 during rough grinding, and sends a finish open signal 38 to the solenoid valve 36 during finish grinding. . The solenoid valve 35 is opened when an open signal 37 for rough grinding is input from the control device 30, and is closed at other times.

The solenoid valve 36 is opened when the finishing open signal 38 from the control device 30 is input, and is closed at other times. Further, the flow rate adjusting valve 33 is set to a flow rate for rough grinding, and the flow rate adjusting valve 34 is set to a flow rate for finish grinding which is smaller than the flow rate for rough grinding.

In the internal grinding machine of this embodiment having such a configuration, the work piece 23 is rotated by the main shaft 15, the grindstone 13 is rotated by the grindstone shaft 11, and the grindstone 13 is traversed to move the work piece. The inner surface of 23 is ground. Here, when the workpiece 23 having a lateral hole is machined, only the solenoid valve 35 is opened by the rough grinding open signal 37 from the control device 30 during the rough grinding, and the rough flow control valve 33 sets the rough grinding. A flow rate of grinding fluid for grinding is supplied to the inside of the workpiece 23. On the other hand, at the time of finish grinding, only the electromagnetic valve 36 is opened by the finish opening signal 38 from the control device 30, and the flow rate of the grinding fluid for finish grinding set by the flow rate adjusting valve 34 is supplied to the inside of the workpiece 23. To do.

As described above, by reducing the flow rate of the grinding fluid during the finish grinding, the grinding fluid is prevented from intruding the grindstone 13 into the work piece 23, and the roundness and straightness of the work piece having the lateral hole are reduced. Can be improved. If the flow rate of the grinding fluid is simply reduced in all the steps, the cooling performance and lubricity of the grindstone are impaired, and the grindstone wears and the life of the grindstone is shortened. In this embodiment, by reducing the flow rate only during the finish grinding with a small processing load, it is possible to not only improve the machining accuracy of roundness and straightness but also maintain the life of the grindstone to the same level as before.

Further, since it is not necessary to slow down the rotation of the workpiece, the processing time can be shortened as compared with the conventional case. In the above-described embodiment, the flow rate during rough grinding and the flow rate during finish grinding are switched by switching between the two supply lines 31 and 32. The valve may be opened so that only the solenoid valve of one of the supply lines may be opened during finish grinding with a small flow rate.

Furthermore, the solenoid valve in the supply line for finish grinding with a small flow rate is eliminated, and while the pump is operating, the flow rate of grinding liquid required for finish grinding is always supplied, and the solenoid valve is used for rough grinding. It is also possible to open and supply the required amount of grinding fluid during rough grinding.

[0020]

[Effect of device]

 As described above, according to the present invention, the flow rate of the grinding fluid is switched so that the flow rate of the grinding fluid during the finish grinding becomes smaller than the flow rate of the grinding fluid during the rough grinding. There is an effect that the bite of the grindstone is suppressed during grinding, and the roundness and straightness due to the influence of the lateral hole of the workpiece can be prevented from being lowered without increasing the processing time.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an inner surface grinding machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining processing by a conventional inner surface grinding machine.

FIG. 3 is an explanatory diagram showing a state in which a grindstone is pressed against a workpiece by a grinding liquid.

[Explanation of symbols]

 11 Grindstone Axis 13 Grindstone 15 Spindle 23 Workpiece 27 Grinding Fluid Tank 28 Pump 30 Control Device 31, 32 Supply Line 33, 34 Flow Control Valve 35, 36 Solenoid Valve

Claims (1)

[Scope of utility model registration request] 1. A holding means for rotatably holding a workpiece, a grindstone for grinding an inner surface of the workpiece held by the holding means, a grindstone rotating means for rotating the grindstone, and a grinding of the workpiece. The grinding fluid supply means for supplying the grinding fluid at times, and the flow rate of the grinding fluid supplied by the grinding fluid supply means so that the flow rate of the grinding fluid during the finish grinding becomes smaller than the flow rate of the grinding fluid during the rough grinding. An inner surface grinding machine, characterized by comprising: