JP2015020238A - Grinding liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding liquid supply device which supplies an adequate amount with avoiding waste consumption of the grinding liquid for a grinding device provided with multiple grindstones including plural grinding areas in the rotary axis direction.SOLUTION: A grinding liquid supply device comprises a nozzle 4 which moves together with a rotating grindstone 3 against movement of the grindstone 3 in the direction orthogonal to an axis and maintains the positional relationship with a workpiece 2 constant against movement in the axial direction. A grindstone table 5 which moves in the axial direction of the grindstone axis is provided at a cross slide 55 which moves in the feeding direction of a notch of the grindstone that is the direction orthogonal to the grindstone axis, and, in a grinding device of a structure in which the rotation grindstone 3 is axially-supported at the grindstone table 5, the nozzle 4 of the grinding liquid supply device is fitted at the home position of the cross slide 55.

Description

  The present invention relates to an apparatus for supplying a grinding liquid to a rotating grindstone having a plurality of grinding regions (portions used for grinding) in the direction of the rotation axis, and the relative relationship between the grindstone and the workpiece (workpiece) in the direction of the grindstone rotation axis. The present invention relates to the above-described apparatus particularly suitable for a grinding apparatus that selects one of a plurality of grinding regions and processes a workpiece by changing the position.

  Grinding of a workpiece is often performed in a plurality of steps such as rough grinding and finish grinding, or rough grinding, intermediate grinding and finish grinding, and the grindstone size (count) of the grindstone used varies depending on the step. In a grinding apparatus that grinds a workpiece with a rotating grindstone, it is complicated to replace the grindstone for each process, and the machine operation rate is greatly reduced. Therefore, when the surface to be ground of the workpiece is large, a plurality of grinding wheels are provided in one machine or production line so that grinding in a plurality of steps is continuously performed. On the other hand, when the surface to be ground is narrow, such as internal grinding of grooves provided on the workpiece or peripheral grinding of plate-like workpieces, the outer peripheral surface of one rotating grindstone is used for rough grinding, intermediate grinding, and finish grinding. By providing a plurality of grinding regions divided for each process, such as for use, and changing the position of the grinding wheel in the axial direction with respect to the workpiece, grinding is performed in a plurality of processes with a single grinding wheel.

  In addition, when the work surface to be ground is smaller than the axial length of the grinding wheel circumferential surface, if grinding is performed with the position of the work and the grindstone kept constant, only a part of the grindstone will be worn out. It is also practiced to make the wear of the grinding wheel uniform by moving the position in the grinding wheel axis direction. In this specification, a grindstone provided with a plurality of grinding regions on the outer peripheral surface of the grindstone is called a multi grindstone.

  The grindstone 3 shown in FIG. 4 is a grindstone having a plurality of groove-shaped grinding regions 31 to 36 on the outer periphery, and is a grindstone that performs processing including chamfering 22 and 23 on the edge 21 of the plate-like workpiece 2. . The grindstone 3 is formed in three layers having different grain sizes of coarse, medium and finished abrasive grains in the axial direction, and grinding grooves 31 to 36 serving as grinding regions are formed on the outer periphery of these layers. The grinding grooves 31 and 32 are for rough grinding, the grinding grooves 33 and 34 are for intermediate grinding, and the grinding grooves 35 and 36 are for finish grinding. Grinding the workpiece 2 in the axial direction (vertical direction in the figure) with respect to the workpiece 2 and grinding the workpiece 2 with the grinding grooves 31 → 33 → 35, thereby performing three steps from rough grinding to finish grinding. By alternately performing the movement of the grooves 31 → 33 → 35 and the movement of the grinding grooves 32 → 34 → 36, the six circumferential grooves (grinding regions) are uniformly worn. In addition, since the wear of the grinding surface of the finish grinding is usually larger than that of the grinding surface of the rough grinding, a multi-grinding stone having more grinding areas for finishing grinding than the grinding area for rough grinding is also used.

  The grinding process is desirably performed while supplying a grinding liquid to a processing point (contact point between the grindstone and the workpiece). In grinding hard brittle plates such as glass plates, pure water is used as a grinding fluid. The grinding fluid supply device provided in the grinding device is equipped with a nozzle that sprays the grinding fluid toward the processing point. This nozzle is mounted on the grinding wheel base that supports the grinding wheel and the grinding wheel cover that covers the grinding wheel. It moves and moves up and down with the grindstone.

  When performing grinding by attaching a multi-grinding wheel to the grinding wheel shaft of a grinding machine equipped with a conventional grinding fluid supply device, the grinding fluid is supplied to the entire outer peripheral surface of the grinding wheel in each step of switching the grinding stone by moving it up and down. Therefore, the amount of grinding fluid supplied is wasted. Although it is conceivable to reduce waste by adjusting the amount of grinding fluid flowing out from the nozzle, it is not possible to know how much grinding fluid is actually supplied to the grinding area that is part of the grinding wheel outer peripheral surface. The supply amount cannot be managed accurately. In particular, as shown in FIG. 4, when grinding is performed in a groove-shaped or ring-shaped grinding area (grinding groove or grinding ring) provided on the outer peripheral surface, the inner surface of the groove or ring surface that is actually ground. It is almost impossible to ascertain how much grinding fluid is being supplied.

  Furthermore, although the amount of grinding fluid required differs between the grinding wheel for rough grinding and the grinding wheel for finish grinding, the supply amount of grinding fluid for each grinding groove or grinding ring cannot be grasped. The optimum amount of grinding fluid cannot be supplied.

  There is almost no adverse effect on processing caused by excessive supply of grinding fluid, but there is a large adverse effect due to lack of grinding fluid, so it is necessary to always supply the grinding fluid with sufficient margin after all. Thus, there was a problem that the grinding fluid was supplied more than necessary.

  In view of the above problems, the present invention provides a grinding apparatus capable of supplying an appropriate amount of grinding fluid in a grinding apparatus equipped with a multi-grinding wheel, and thus avoiding wasteful consumption of the grinding liquid. It is an issue.

  In the present invention, the nozzle 4 (4a to 4g) that moves together with the grindstone with respect to the movement of the rotating grindstone 3 in the direction perpendicular to the axis and holds the positional relationship with the workpiece constant is provided with respect to the movement in the axial direction. The above-described problems are solved by providing a grinding fluid supply device provided.

  In the multi grindstone 3, by changing the relative positional relationship between the workpiece 2 and the grindstone 3 in the grindstone axial direction, one of the plurality of grinding regions 31 to 36 formed on the grindstone 3 is selected, and the selected grinding is performed. The workpiece is machined in the area. Therefore, the nozzle 4 of the grinding fluid supply device of the present invention is held so that the relative positional relationship with the grindstone shaft 51 is constant in the direction orthogonal to the grindstone shaft 51 of the grinding device. The workpiece 2 is held such that the relative positional relationship with the table or holder 1 holding the workpiece is constant.

  A rotating grindstone of a grinding apparatus that grinds the periphery of a workpiece is provided with a grindstone base 5 that moves in the axial direction of the grindstone shaft 51 on a lateral feed base 55 that moves in the cutting feed direction of the grindstone 3 that is orthogonal to the grindstone shaft 51. It is provided and pivotally supported on the grinding wheel base 5. In the grinding device having such a structure, the nozzle 4 of the grinding fluid supply device may be mounted at a fixed position of the lateral feed base 55.

  When the processing point p at which the peripheral surface of the grindstone 3 and the workpiece 2 come into contact changes in the circumferential direction of the grindstone 3 (see FIG. 6), nozzles 4a to 4f for injecting a grinding fluid in the tangential direction of the grindstone peripheral surface are provided. A plurality of such tangential angles are provided so that the grinding fluid is supplied to the entire range in which the machining point p moves. Moreover, also about the nozzle 4g which injects a grinding liquid from the outer side of a grindstone to the radial direction of a grindstone, the several or slit-shaped nozzle hole 41 is provided in the circumferential direction of a grindstone, and it covers the whole range where the processing point p moves. Make sure that the machining fluid is supplied evenly.

  In a conventional grinding fluid supply device, when a grinding wheel having a plurality of workpiece grinding regions formed on one grinding wheel is mounted and the grinding region is properly used depending on the processing purpose, the amount of grinding fluid supplied to the grinding region that is actually used is reduced. It was difficult to manage. On the other hand, according to this invention, the grinding fluid supply direction from the tip of the grinding fluid supply nozzle can be fixed regardless of the change of the grinding region, and the amount of grinding fluid supplied to the processing point can be managed. .

  That is, in this invention, since the grinding fluid supply nozzle is fixed in this direction with respect to the movement of the grinding wheel in the grinding wheel axis direction to change the grinding region, in the grinding process with the grinding stone having the grinding region for a plurality of steps. The amount of grinding fluid required by the grinding area currently used is supplied. As a result, it becomes possible to control the amount of grinding fluid supplied in each processing step, so the amount of grinding fluid required for each process can be measured to determine whether it is excessive or insufficient. The amount of grinding fluid for each step Can be adjusted and managed, and there is an effect that waste and unevenness of the supply of the grinding fluid can be suppressed.

Plan view showing an embodiment Side view showing the standby state of the grindstone Side view showing machining status Enlarged side view showing a part of the multi-grinding wheel and grinding fluid supply device Diagram showing grinding fluid supply piping Schematic plan view of a grinding machine where the machining point swings

  1 to 5 are views showing an embodiment of the present invention. As shown in FIG. 6, the grinding apparatus shown in the drawing is a multi-grinding stone 3 (a plurality of grinding grooves 31 to 36 provided on the outer circumferential surface of the outer peripheral edge 21 of the plate 2 adsorbed and held by the table 1 rotating around the vertical axis. 4), a polar-type grinding device that grinds by a combined motion of the rotation of the table 1 and the movement of the rotating grindstone 3 in the direction perpendicular to the axis (movement in the direction approaching and separating from the table 1). is there. In such a grinding apparatus, as shown in FIG. 6, when the workpiece 2 has a shape other than a disc (FIG. 6 shows an example of a rectangle), the outer periphery of the grindstone 3 and the periphery of the workpiece 2 are The processing point p that becomes a contact point reciprocates in the circumferential direction of the grindstone 3 as the workpiece 2 rotates.

  FIG. 1 is a plan view showing a positional relationship among the rotating grindstone 3, the table 1, and the nozzles 4 (4a to 4g) of the grinding fluid supply device. The grinding apparatus shown in the figure includes six nozzles 4a to 4f for injecting a grinding liquid in the tangential direction of the grindstone circumferential surface from both sides sandwiching the moving range of the machining point p of the grindstone 3, and grinding from the workpiece side toward the machining point. Seven nozzles including a nozzle 4g for injecting liquid are provided. The nozzle 4g is provided above the table 1 in order to avoid interference with the work 2 held by suction on the table 1, and is provided so as to inject the grinding fluid from an obliquely upward direction toward the machining point.

  The table 1 is supported by an apparatus frame (not shown) and is driven to rotate at a fixed position around a vertical axis. The grindstone 3 is mounted on a grindstone shaft 51 that is pivotally supported on the grindstone base 5 in the vertical direction. The grinding wheel shaft 51 is rotationally driven by a grinding wheel motor 52 mounted on the grinding wheel base 5. The grinding wheel base 5 is mounted on a lateral feed base 55 that moves in a direction perpendicular to the axis (the X-axis direction in FIG. 6) in which the grinding wheel 3 approaches and separates from the table 1, and the feed screw 54 is rotated by the lifting motor 53. Thus, the elevation position is controlled. The lateral feed base 55 is movably supported on a rail in the X-axis direction of an apparatus frame (not shown), and is screwed into a feed screw 57 that is rotationally driven by a feed motor 56 to control the position in the X-axis direction in FIG. ing.

  A feed motor 56 and a spindle motor (not shown) that rotationally drives the table 1 are synchronously controlled by a controller, and are controlled in association with the rotation angle θ of the table and the distance x of the grindstone center with respect to the table center. The peripheral edge of the workpiece 2 is ground. During this processing, the contact point (processing point) p between the grindstone 3 and the peripheral edge 21 of the workpiece reciprocates along the circumference of the grindstone 3 to both sides of a line s connecting the grindstone center and the table center.

  In consideration of the moving range of the machining point p on the circumferential surface of the grindstone, the nozzle 4 of the grinding fluid supply device shown in the drawing is processed so that the grinding fluid is supplied over the entire moving range of the machining point p. Three nozzles 4a to 4c and 4d to 4f for injecting grinding fluid in a tangential direction to the grinding wheel circumferential surface are arranged on both sides of the moving range of the point p, and nozzles for supplying the grinding fluid from the workpiece side toward the grinding stone 3 4g is arranged. The nozzle 4g is provided with a plurality of nozzle holes 41 so that the grinding liquid is supplied over the entire movement range of the processing point p.

  The nozzles 4 a to 4 f are supported by brackets 42 extending from the opposite table side of the grindstone 3 to both sides of the grindstone 3, and the base end 43 on the opposite table side of the bracket 42 is connected to the lateral feed base 55 via the spacer 44. The lower surface is fixed with bolts 45.

  The lateral feed base 55 is supported so as to be movable on a rail in a direction perpendicular to the axis of the grindstone shaft 51, and the table 1 is pivotally supported at a fixed position, so that the workpiece 2 and the nozzle 4 held by the table 1 are supported. The relative position in the wheel axis direction does not change. The nozzle 4 is adjusted to a height at which the grinding liquid is sprayed onto the circumferential surface of the grindstone at the height of the workpiece 2 held on the table 1 by adjusting the thickness of the spacer 44.

  The piping of the grinding fluid supply device can be provided with a flow rate switching unit 6 as shown in FIG. In the example of the figure, the grinding fluid discharged from the grinding fluid pump 61 passes through any one of the flow paths of the solenoid valves 62 to 64 that are opened and closed by the controller and the flow rate adjusting valves 65 to 67 that are connected in series to the respective solenoid valves. It branches after passing, and is supplied to the nozzle 4. The flow rate adjusting valves 65 to 67 are adjusted to different flow rates. When any one of the grinding areas 31 to 36 is selected by raising and lowering the grindstone table 5, the controller passes through the flow rate adjusting valve in which the grinding liquid is adjusted to an amount necessary for processing in the selected grinding area. The solenoid valves 62 to 64 are opened and closed so as to be supplied to 4. By providing such means, an appropriate amount of grinding fluid can be supplied to each of the grinding regions 31 to 36.

  When the multi-grinding wheel 3 as shown in FIG. 4 is mounted on the grindstone shaft 51 of the grinding apparatus and the outer peripheral edge 21 of the workpiece 2 is processed, the controller first sets the grinding grooves 31 or 32 for rough grinding to the height of the workpiece 2. Then, the grinding wheel base 5 is moved so that rough grinding is performed, and then the grinding wheel base 5 is moved so that the grinding groove 33 or 34 for intermediate grinding is at the height of the workpiece 2, and the middle grinding is performed. Then, the grinding wheel base 5 is moved so that the grinding groove 35 or 36 for finish grinding becomes the height of the workpiece 2 and finish grinding is performed. During the rough grinding, intermediate grinding, and finish grinding, the grinding fluid is supplied from the nozzle 4, but the grinding is sprayed from the nozzle 4 regardless of the movement of the grinding wheel 3 in the axial direction by the lifting and lowering operation of the grinding wheel base 5. The liquid is sprayed toward the processing points of the grinding grooves used in the respective steps, and supply of useless grinding liquid to the grinding grooves that are not used is prevented. Therefore, it becomes possible to manage the amount of grinding fluid required for processing in each grinding groove. For example, the electromagnetic valves 62 to 64 provided in the grinding fluid supply circuit are opened and closed in association with the position of the grinding wheel base 5. Thus, it is possible to appropriately adjust the amount of the grinding fluid in rough grinding, intermediate grinding, and finish grinding.

  As described above, according to the grinding fluid supply apparatus of the present invention, the grinding fluid is intensively supplied to the grinding region currently used in the grinding process using the grindstone having a grinding region for a plurality of steps. Therefore, it is possible to manage the supply amount of the grinding fluid for each grinding area, so it is possible to adjust and manage the necessary grinding fluid amount for each area, and to prevent waste and unevenness of the grinding fluid supply. There is.

DESCRIPTION OF SYMBOLS 1 Table 2 Board | plate material 3 Rotating grindstone 4 (4a-4g) Nozzle 5 Grinding wheel stand 31-36 Grinding groove 41 Nozzle hole 51 Grinding wheel shaft 55 Horizontal feed stand p Processing point

Claims (3)

In a grinding fluid supply apparatus of a grinding apparatus comprising a rotating grindstone having a plurality of grinding regions formed on a peripheral surface, and grinding the workpiece in one of the plurality of grinding regions by movement of the rotating grindstone in the grinding wheel axis direction relative to the workpiece ,
The grinding fluid supply nozzle for supplying the grinding fluid to the circumferential surface of the grinding wheel moves together with the grinding wheel for the movement of the rotary grinding wheel in the direction perpendicular to the axis, and the position relative to the workpiece is fixed for the movement in the axial direction. The grinding fluid supply device of the grinding device held in In the grinding fluid supply apparatus of the grinding apparatus, wherein the rotating grindstone is mounted on a lateral feed base that moves in a direction orthogonal to the grindstone axis and is supported by the grindstone base that moves in the grindstone axis direction.
The grinding fluid supply apparatus according to claim 1, wherein the nozzle is mounted on the lateral feed base. In the grinding fluid supply apparatus of the grinding apparatus, wherein the rotating grindstone is mounted on a lateral feed base that moves in a direction orthogonal to the grindstone axis and is supported by the grindstone base that moves in the grindstone axis direction.
A nozzle unit including a plurality of nozzles for injecting a grinding liquid in a tangential direction to a grindstone circumferential surface and a nozzle for injecting a grinding liquid from the outside in the radial direction, the nozzle unit being mounted on the lateral feed base. Item 2. The grinding fluid supply device according to Item 1.

Images