JP5909148B2 - Internal grinding machine and internal grinding method - Google Patents

Description

  The present invention relates to an internal grinder that grinds the inner surface of a workpiece using a grinding wheel, and in particular, an internal grinder and an inner surface that can prevent scattering of a grinding fluid (coolant) and chips to prevent the device from being soiled. The present invention relates to a grinding method.

  Conventionally, a safety cover that can be moved to cover the grinding wheel is provided so that the operator does not touch the rotating grinding wheel in consideration of the safety of grinding work, such as when attaching and detaching a workpiece. A grinding machine has existed conventionally (see Patent Document 1).

JP 2007-276032 A

However, the conventional grinder has a structure in which the cover that obstructs the grinding is retracted when the grinding wheel is actually grinding the workpiece, so that the coolant and chips supplied to the workpiece during the grinding operation are not In addition to being scattered around the apparatus by the rotation of the grinding wheel, it was widely scattered in the work environment as a fine mist-like coolant mist.
Since the dispersion of coolant and coolant mist in the work environment is a serious problem from the health and safety aspect of the work environment, a cover that opens and closes the entire grinding machine is provided to improve this. ing.
However, even if the entire grinding machine is covered with a cover, there is no improvement with respect to the contamination of the entire grinding machine located in the cover and fouling, and the coolant mist filling the cover is removed. In order to do this, a dust collector has been installed and the coolant mist in the cover has been sucked and discharged through a duct. In order to install the dust collector and the duct, a large amount of space and cost are required.

  The present invention has been made in view of the circumstances described above, and its purpose is to improve the safety and hygiene in the grinding work by preventing the dispersion of the coolant and the coolant mist in the grinding work by the internal grinding machine. It is to provide an internal grinding machine that can contribute and save space and cost.

The internal grinding machine of the present invention covers a spindle having a workpiece stopper for holding and positioning a workpiece by contacting the workpiece and a chuck for holding the workpiece, and a chuck for opening the grinding region and fixing the workpiece. A fixed cover disposed on the main shaft, and a cylindrical expansion / contraction cover provided on a grindstone spindle that drives the grinding wheel, and having a spring property that covers the grinding grindstone in an elastic manner in the direction of the grindstone axis. A telescopic cover abuts the fixed cover to seal the grinding region including the workpiece and the grinding wheel, and the telescopic cover absorbs fine movement during grinding of the main spindle and / or the grinding wheel spindle to perform grinding. It is characterized by maintaining the sealing of the processing area.
With this configuration, the coolant delivered to the workpiece is scattered around during grinding, but the grinding area is sealed by the fixed cover and the extendable cover. The coolant will not scatter.

The extendable cover has a bellows shape.
Thereby, even if the main shaft or the grindstone spindle is finely moved, the expansion / contraction cover absorbs this and the sealing of the grinding region by the fixed cover and the expansion / contraction cover is maintained.

  The center of the work stopper has a coolant flow passage communicating with the machining hole of the workpiece.

  An inner surface grinding method of the present invention includes a spindle having a workpiece stopper having a coolant flow passage that contacts a workpiece and positions the workpiece and communicates with a machining hole of the workpiece and a chuck that holds the workpiece, and a grinding region A fixed cover disposed on the main shaft to cover the chuck that fixes the workpiece by opening the opening, and a spring property that is disposed on the grindstone spindle that drives the grindstone and covers the grindstone in the direction of the grindstone axis. A grinding method using an internal grinding machine provided with a cylindrical expansion / contraction cover, wherein the expansion / contraction cover abuts the fixed cover during grinding and seals the grinding region including a workpiece and a grinding wheel In addition, the telescopic cover absorbs fine movement during grinding of the main spindle and / or the grinding wheel spindle, and maintains the sealing of the grinding region.

It is explanatory drawing which shows the state before grinding in the internal grinding machine of this invention. It is explanatory drawing which shows the state just before grinding in the internal grinding machine of this invention. It is explanatory drawing which shows the state in the middle of grinding in the internal grinding machine of this invention.

Hereinafter, an embodiment for implementing an internal grinding machine according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 are diagrams illustrating embodiments of the present invention. In these drawings, the same reference numerals denote the same components, and the basic configuration and operation are the same. To do.
<Configuration>
First, as shown in FIG. 1, an internal grinding machine 1 according to the present invention rotates a spindle (rotating part) 3 provided with a chuck 2 that holds and rotates a workpiece W detachably, and the spindle (rotating part) 3. A main shaft (fixed portion) 4 that freely supports the shaft, and a cylindrical fixed cover 5 that is disposed on the main shaft (fixed portion) 4 and has a rigidity such as metal that covers the chuck 2 by opening a grinding region. And a grinding wheel spindle 7 that rotationally drives the grinding wheel 6, and has a configuration in which a grinding wheel shaft slide (not shown) reciprocates in the grinding wheel axis direction with the grinding wheel spindle 7 mounted thereon. Reference numeral 8 denotes a work stopper serving as a reference position for pressing and machining the workpiece W. The workpiece stopper 8 includes a coolant flow path 8a at the center thereof, and the workpiece W is connected to the flow path from the spindle. It is set as the structure distribute | circulated to the hole Wa.
The fixed cover 5 has a base end fixed to the main shaft (fixed portion) 4, extends in a cylindrical shape toward the grindstone spindle 7 facing from the base, and from the position where the outer periphery of the chuck 2 is covered, the center of the rotation axis of the main shaft The front portion 5a has a shape that covers the chuck 2 that extends in the direction and holds the workpiece W, and the grinding wheel 6 grinds the machining hole Wa of the workpiece W in the central portion of the front portion 5a. It is set as the circular opening part 5b penetrated in order to process.

A cylindrical expansion / contraction cover 10 is disposed at the tip of the grinding wheel spindle 7 on the grinding wheel 6 side so as to cover the side peripheral surface of the grinding wheel shaft 9 that holds the grinding wheel 6. Reference numeral 10 denotes an opening distal end portion 10 a that is positioned so as to be in contact with the front surface portion 5 a of the fixed cover 5, and has a base end portion 10 b fixed to the outer periphery of the grindstone spindle 7.
The telescopic cover 10 has a structure in which the opening end 10a can be expanded and contracted in the direction of the grindstone axis while the base end 10b is fixed to the outer periphery of the grindstone spindle 7. In this embodiment, the bellows This will be described using a bellows material having a spring shape. The spring property of the extendable cover 10 is biased so as to extend in the direction toward the workpiece W in the grinding wheel axis direction. As the bellows material of the stretchable cover 10, a durable metal, synthetic resin, or composite material of metal and synthetic resin is appropriately used. The grinding wheel spindle 7 oscillates (oscillates) in the grinding wheel axis direction during grinding, but the amplitude is absorbed by the spring property of the extendable cover 10.
Further, the stretchable cover 10 other than the bellows material is not limited to a bellows shape, and includes, for example, a plurality of cylindrical bodies having slightly different inner diameters, such as a stretchable rod antenna, and has appropriate springiness and a stretchable function. You may use the cylindrical body which exhibits. A drain 11 is provided at the bottom of the fixed cover 5 and discharges coolant accumulated in the fixed cover 5 to the outside.

<Grinding method>
The internal grinding machine 1 of the present invention having such a configuration will be described in detail below.
First, as shown in FIG. 2, in order to grind the machining hole Wa of the workpiece W, the grindstone shaft slide is driven to move the grindstone spindle 7 in the workpiece W direction, that is, in the left direction in the figure. Then, before the grinding wheel 6 comes into contact with the workpiece W, the opening tip portion 10 a of the extendable cover 10 is brought into contact with the front portion 5 a of the fixed cover 5. As a result, the area occupied by the grinding wheel 6 and the workpiece W during grinding is covered with the fixed cover 5 and the extendable cover 10.
In this state, the coolant passes through the spindle, the coolant flow passage 8a of the work stopper, and flows into the machining hole Wa of the workpiece W. As shown in FIG. The grindstone 6 is inserted into and contacted with the inner peripheral surface of the machining hole Wa of the workpiece W to be ground. During this grinding, the wheel spindle slide oscillates (oscillates) in the range of 0.1 to 20 millimeters in the wheel axis direction, but the telescopic cover 10 has its opening tip 10a at the front part 5a of the fixed cover 5. Oscillation is absorbed while maintaining the contacted state, and the coolant mist does not leak from the contacted part.

The coolant scattered by grinding is mainly received in the fixed cover 5 and discharged from the drain 11 while accumulating at the bottom, while the coolant mist fills the fixed cover 5 and the expansion / contraction cover 10 with the passage of time. It adheres to the peripheral surface and drops. Then, after the grinding process is finished, the grindstone slide is moved to the right in the figure to replace the workpiece W, and when the grinding wheel 6 comes out of the machining hole Wa of the workpiece W, the supply of coolant is stopped, and the grindstone The slide is moved to the right in the figure, and the fixed cover 5 and the expansion cover 10 are pulled apart.
In addition, on the spindle side, during the grinding process, the notch is moved in a direction perpendicular to the grinding wheel axis by the spindle slide. At this time, the opening tip 10a of the expansion / contraction cover 10 that contacts the fixed cover 5 slides. Or the elastic cover 10 is bent to absorb the displacement of the movement amount.

  The internal grinding machine of the present invention can be used in the processing industry for precisely grinding various materials such as metals.

DESCRIPTION OF SYMBOLS 1 ... Internal grinding machine 2 ... Chuck 5 ... Fixed cover 5a ... Front part 5b ... Opening part 6 ... Grinding wheel 7 ... Grinding wheel spindle 8 ... Work stopper 8a ... Coolant flow path 9 ... Grinding wheel shaft 10 ... Telescopic cover 10a ... Opening tip part 10b ... Base end W ... Workpiece Wa ... Machining hole

Claims (4)

A spindle having a chuck for holding the workpiece stopper and the workpiece to have a coolant passage which communicates the workpiece machining hole positioning and the workpiece in machining contact,
A fixing cover disposed on the main shaft to cover a chuck that opens a grinding region and fixes a workpiece;
A spring property covering telescopically the grinding wheel is disposed in the grindstone spindle to drive the grinding wheel is urged so as to extend in a direction toward the workpiece of the grinding wheel axis direction, at the time of workpiece removable apart from the fixed cover And a cylindrical expansion cover provided
During grinding,
And sealing the grinding area in which the elastic cover comprises said fixed cover and contact with the workpiece and the grinding wheel, thereby preventing scattering of the coolant and coolant mist,
Inner surface, characterized in that the spindle and / or the swing of the wheel axis in the range of 0.1~20mm during grinding of the grinding wheel spindle said elastic cover absorbs maintain the sealing of the grinding area Grinder. The elastic cover is a bellows shape, a metallic durable, synthetic resin, or metal and Ri composite Tona synthetic resin, have a strength so as not to deform under its own weight even when the opening of the workpiece detachable internal grinder of claim 1, wherein to Rukoto. 3. The internal grinding machine according to claim 1, wherein a drain that discharges the liquid that the coolant and the coolant mist adhere to the inner surface of the fixed cover is discharged at a bottom portion of the fixed cover. A spindle provided with a workpiece stopper having a coolant flow path that contacts a workpiece and positions the workpiece and communicates with a machining hole of the workpiece, and a chuck that holds the workpiece;
A fixing cover disposed on the spindle to cover the chuck that opens the grinding area and fixes the workpiece;
A spring property covering telescopically the grinding wheel is disposed in the grindstone spindle to drive the grinding wheel is urged so as to extend in a direction toward the workpiece of the grinding wheel axis direction, at the time of workpiece removable apart from the fixed cover A grinding method using an internal grinding machine provided with a cylindrical telescopic cover provided,
And sealing the grinding area in which the elastic cover during grinding comprises said fixed cover and contact with the workpiece and the grinding wheel to prevent the scattering of the coolant and coolant mist and is recovered as a liquid,
An inner surface grinding method, wherein the expansion and contraction cover absorbs fine movements during grinding of the main spindle and / or the grindstone spindle to maintain sealing of the grinding region.