JP2020182997A - Double-head surface grinder and grinding method - Google Patents

Abstract

To provide a double-head surface grinder which is good in productive efficiency and is economically excellent while maintaining process tolerance when grinding a single surface of a work-piece, and a grinding method.SOLUTION: A double-head surface grinder 10, which is a grinder which can grind both principal surfaces of a work-piece W by use of a pair of grindstones 14a, 14b which are so located as to face each other with a space therebetween, comprises: a revolution plate 38 which accommodates the work-piece W; a back and forth movement unit 34 which reciprocates the revolution plate 38 together with the work-piece W in a cross direction; a pressing part 44 which is so provided on the grindstone 14a side as to be movable in association with reciprocation of the work-piece W in the cross direction while pressing one principal surface of the work-piece W accommodated in the revolution plate 38; and a feeding device 30a which feeds the pressing part 44 vertically to the work-piece W in order to grind the other principal surface of the work-piece W by the grindstone 14b in the state that the work-piece W is sandwiched by the pressing part 44 and the grindstone 14b.SELECTED DRAWING: Figure 2

Description

The present invention relates to a double-headed surface grinder and a grinding method, and more specifically to a double-headed surface grinder and a grinding method for grinding the main surface of a throw-away tip.

As an example of this type of prior art, Patent Document 1 discloses a throw-away tip grinding device. When both main surfaces of a throw-away insert (hereinafter referred to as a workpiece) are ground using this grinding device, the workpiece accommodated in the support hole of the chip carrier is inserted between the upper and lower grindstones, and the workpiece has a predetermined thickness. It is cut by the upper or lower whetstone. During processing, the work inserted between the grindstones is reciprocated in the direction orthogonal to the grindstone axis. The work is taken out from between the grindstones at the same time as the cutting of the grindstone is completed.

Japanese Unexamined Patent Publication No. 5-84447

When grinding one side of a work piece using such a grinding device, the work is pressed against the rotating grindstone by rotating one grindstone and feeding the other grindstone into the work without rotating it. Then, only one side of the work is processed so that the work has a predetermined thickness. At this time, the non-rotating grindstone is pressed against the other unprocessed surface of the work. Therefore, if the work is forcibly moved and dragged in that state, the corners of the work may be chipped or damaged. Therefore, it is not possible to reciprocate the work during machining as in the case of double-sided machining, so that the work is pressed against the grindstones while being stationary between the grindstones.

However, when the work is always pressed against the same position of the grindstone and processed, only the same part in contact with the work is worn to form a groove on the grindstone on the machined surface side, and the grindstone is unevenly worn to form a grindstone. The flatness of the machined surface is lost, and the work cannot be machined accurately. Therefore, in order to maintain the machining accuracy, every time several workpieces are ground, it is necessary to dress the unevenly worn grindstone surface to always maintain the flatness, resulting in poor production efficiency. In addition, if the dressing frequency is high, the amount of grindstone consumed by the dressing is large, which is uneconomical.

Therefore, a main object of the present invention is to provide a double-headed surface grinder and a grinding method which are economically excellent in production efficiency while maintaining processing accuracy even when grinding one side of a work. Is.

A double-headed surface grinder capable of grinding both main surfaces of a work by using a pair of grindstones arranged to face each other at intervals in the first direction in order to achieve the above-mentioned object, and is an accommodating portion for accommodating the work. The first moving part that reciprocates the accommodating portion together with the work in the second direction orthogonal to the first direction, and the reciprocating movement of the work in the second direction while pressing one main surface of the work accommodated in the accommodating portion. Pressing to grind the other main surface of the work with the other grindstone while the pressing portion provided on one grindstone side and the work is sandwiched between the pressing portion and the other grindstone so that it can move with the movement. A double-headed surface grinder is provided that includes a feeding portion that feeds at least one of the portion and the other grindstone to the work in the first direction.

Further, it is a grinding method in which a work is ground by using a pressing portion and a grindstone that are arranged so as to face each other at intervals in the first direction. A grinding step in which at least one of the pressing portion and the grindstone is fed to the work in the first direction so as to be sandwiched by the pressing portion, and the other main surface of the work is ground by the grindstone while pressing one main surface of the work by the pressing portion. In the grinding step, a grinding method is provided in which the accommodating portion is reciprocated together with the work in a second direction orthogonal to the first direction, and the pressing portion is reciprocated with the reciprocating movement of the work in the second direction. ..

In the above-described invention, when grinding one side of the work, at least one of the pressing portion and the grindstone is fed in the first direction with respect to the work so that the work accommodated in the accommodating portion is sandwiched between the pressing portion and the grindstone. Is done. Then, while one main surface of the work is pressed by the pressing portion, the other main surface of the work is ground by the grindstone. At the time of single-sided grinding of the work, the accommodating portion is reciprocated together with the work in the second direction orthogonal to the first direction, and the pressing portion is moved along with the reciprocating movement of the work in the second direction. In this way, by pushing the work being machined by the pressing portion and reciprocating the work on the grindstone surface, the work can be machined on one side using the entire grindstone surface or substantially the entire grindstone surface. Further, since the work and the pressing portion reciprocate integrally in synchronization with each other while the main surface of the work being not processed is pressed by the pressing portion, the work is not scratched or chipped. Therefore, the flatness of the grindstone can be maintained for a long time, and the processing accuracy is stable. In addition, the frequency of dressing for modifying the grindstone surface and the amount of wear of the grindstone due to the dress can be suppressed, and the life of the grindstone can be extended. As a result, even when grinding one side of the work, it is possible to perform grinding that is economically excellent in production efficiency while maintaining processing accuracy.

Preferably, the pressing portion includes a slide base provided on one grindstone side and a slide portion slidable in a second direction with respect to the slide base and pressing one main surface of the work. In this case, the slide portion can push the work while performing the same reciprocating operation as the work during single-sided machining, and the pressing portion can be easily configured.

Further, preferably, a connecting portion for connecting the sliding portion and the accommodating portion is further included. In this case, when the accommodating portion is reciprocated in the second direction by the first moving portion during single-sided machining, the slide portion connected to the accommodating portion via the connecting portion is reliably moved in the second direction together with the accommodating portion and the work. Can move back and forth.

More preferably, it further includes a second moving portion that moves the accommodating portion to switch the position of the work accommodated in the accommodating portion between the supply position and the grinding position side, and the connecting portion is a first engaging portion provided on the slide portion. A portion and a second engaging portion provided in the accommodating portion and capable of engaging with the first engaging portion are included, and the first engaging portion and the second engaging portion are located on the grinding position side of the work. When they engage with each other. In this case, when the work is on the grinding position side during single-sided machining, the first engaging portion and the second engaging portion engage with each other to ensure that the accommodating portion, the sliding portion, and the work reciprocate. The grinding work becomes smooth by interlocking. On the other hand, when the work is in the supply position, the first engaging portion and the second engaging portion do not engage with each other, so that the work does not move undesirably and the work replacement work becomes smooth.

In the present invention, the "main surface of the work" means an end surface of the outer surface of the work excluding the inner side surface and the outer side surface.

According to the present invention, even when grinding one side of a work, a double-headed surface grinder and a grinding method which are economically excellent in production efficiency while maintaining processing accuracy can be obtained.

It is a figure which shows the vertical double-headed surface grinder which concerns on one Embodiment of this invention, (a) is a side view diagram, (b) is the AA line sectional view diagram of (a). It is a side view which shows the structure of the main part of the vertical double-headed surface grinder. It is a plan view of the main part shown in FIG. It is a side view which shows the main part of the vertical double-headed surface grinder when a swivel plate is located at a supply position. It is a plan view of the main part shown in FIG. It is a top view which shows the structure of the main part of the vertical double-headed surface grinder which concerns on another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

With reference to FIG. 1, the vertical double-headed surface grinding device (hereinafter, simply referred to as a double-headed surface grinding device) 10 includes a column 12 having a recess 12a. The recess 12a is formed in the central portion of the column 12 so as to open toward the front (the front column 32 side described later). In the recess 12a of the column 12, a pair of grindstones 14a and 14b for grinding the work W are coaxially and opposed to each other at intervals in the V direction (vertical direction in this embodiment). In this embodiment, the V direction corresponds to the first direction. Further, in this embodiment, the grindstones 14a and 14b each have an annular shape in a plan view. The work W is a positive type work in which the angle between the main surface and the side surface is not 90 degrees, and specifically, as shown in FIG. 2, it is an inverted trapezoidal throw-away insert. In order to avoid complicating the drawings, FIG. 1 (a) shows the vicinity of the pair of grindstones 14a and 14b in a simplified manner, and FIG. 1 (b) shows a part of the configuration including the drive motor 28b described later. The illustration is omitted, and in FIGS. 3, 5 and 6, which will be described later, the illustration of the grindstone shaft 22a and the like is omitted. Further, in FIGS. 2 and 4, in order to facilitate understanding, the grindstones 14a and 14b, the work W, and the swivel plate 42 described later are shown in cross section.

With reference to FIG. 2, the pair of grindstones 14a and 14b are attached to the disc-shaped grindstone mounting plates 18a and 18b by a plurality of bolts 16, respectively. The grindstone mounting plates 18a and 18b are attached to the ends of the grindstone shafts 22a and 22b by a plurality of bolts 20, respectively. The grindstone shafts 22a and 22b penetrate the cylindrical support portions 24a and 24b in the vertical direction, and are supported by the support portions 24a and 24b rotatably and vertically via bearings (not shown), and the belts 26a and 26a, respectively. It is interlocked with the drive motors 28a and 28b via the 26b. Therefore, the rotational driving force of the drive motors 28a and 28b is transmitted to the grindstone shafts 22a and 22b via the belts 26a and 26b, whereby the grindstones 14a and 14b are rotationally driven.

The grindstone shafts 22a and 22b can be moved in the vertical direction by the feeding devices 30a and 30b, respectively. By moving the grindstone shafts 22a and 22b in the vertical direction by the feeding devices 30a and 30b, respectively, the pair of grindstones 14a and 14b are moved in the vertical direction, respectively. In this embodiment, the height of the lower grindstone 14b is set in advance to be substantially equal to the upper surface of the guide plate 42 (lower surface of the work W before grinding), which will be described later, and when the grindstone 14b is worn. For example, the grindstone 14b is moved in the vertical direction to make fine adjustments.

The front column 32 is arranged on the front side of the column 12 and at a position adjacent to the column 12. The front column 32 is provided with a front-rear moving unit 34 and a swivel unit 36.

The front-rear movement unit 34 includes a base 34a, a support portion 34b, a drive motor 34c, and a front-rear drive screw 34d, and supports the swivel unit 36. The base 34a is formed in a hollow housing shape, and is provided so as to extend in the X direction (in this embodiment, the front-rear direction) orthogonal to the V direction. In this embodiment, the X direction corresponds to the second direction. The support portion 34b is formed in a hollow shape and is provided so as to be slidable on the base 34a in the X direction. The drive motor 34c is provided at the front end portion of the base 34a. The front-rear drive screw 34d is housed in the base 34a, one end of the front-rear drive screw 34d is connected to the drive motor 34c, and the other end is connected to the support 34b. When the drive motor 34c is driven, the front-rear drive screw 34d is rotated, whereby the support portion 34b is reciprocated in the front-rear direction on the base 34a. Along with this, the swivel unit 36 is reciprocated in the front-rear direction.

The swivel unit 36 includes a rotating shaft 36a, a drive motor 36b, and a support portion 36c. The rotating shaft 36a penetrates the support portion 34b of the front-rear moving unit 34 in the vertical direction. A drive motor 36b housed in the base 34a is connected to the lower end of the rotating shaft 36a. A disk-shaped support portion 36c is attached to the upper end portion of the rotating shaft 36a. The rotating shaft 36a and the supporting portion 36c are rotatably supported by the supporting portion 34b via the bearing 37 (see FIG. 2). A swivel plate 38 is fixed to the upper surface of the support portion 36c by a plurality of (three in this embodiment) bolts 40 (see FIGS. 2 and 3). The swivel plate 38 is provided so as to extend at right angles to the V direction, that is, in the horizontal direction. The thickness of the swivel plate 38 is set smaller than the finishing thickness of the work W. When the drive motor 36b is driven, the rotating shaft 36a and the support portion 36c are rotated, and the swivel plate 38 is rotated accordingly.

Therefore, the swivel plate 38 is moved in the front-rear direction together with the swivel unit 36 by the swivel unit 34, and is swiveled by the swivel unit 36.

A guide plate 42 for guiding the work W between the grindstones 14a and 14b is provided below the swivel plate 38. The guide plate 42 is formed in a substantially annular shape, and the portion of the guide plate 42 on the grindstone 14b side is formed along the outer peripheral surface of the grindstone 14b in a plan view. The swivel unit 36 is provided so as to penetrate the through hole 42a of the guide plate 42. The swivel unit 36 is rotatable inside the through hole 42a and can be reciprocated back and forth by the front-back moving unit 34. The swivel plate 38 is provided with a plurality of (three in this embodiment) work pockets 38a capable of accommodating the work W. When the swivel plate 38 swivels on the guide plate 42, each work pocket 38a is positioned so that the work pocket 38a of the swivel plate 38 always overlaps with the guide plate 42 in a plan view. Therefore, when the work W is reciprocated between the supply position S1 and the grinding position side (in this embodiment, the standby position S2 before the grinding position G1) by the swivel plate 38, the lower surface of the work W is guided plate. The work W can be guided to the supply position S1 or the grinding position side while sliding along the upper surface of the 42. As a result, the work W can be conveyed without falling from the swivel plate 38.

With reference to FIGS. 1 (b) and 5, in this embodiment, the swivel plate 38 is 180 degrees in one of the directions indicated by the arrow R (for example, clockwise in a plan view) from the position shown in FIG. By rotating, the work W moves from the supply position S1 to the grinding position side (in this embodiment, the standby position S2 before the grinding position G1). On the other hand, when the swivel plate 38 rotates 180 degrees in the other direction from the position indicated by the alternate long and short dash line in FIGS. 1B and 3, the work W moves from the grinding position side to the supply position S1. By rotating the swivel plate 38 in this way, the position of the work W can be switched between the supply position S1 and the grinding position side. Further, the work W is ground from the standby position S2 by moving the swivel plate 38 back and forth between the position shown by the alternate long and short dash line and the position shown by the solid line in FIGS. 1 (b) and 3 by the front-rear moving unit 34. It can reciprocate linearly from the position G1 to the grinding position G2. Therefore, by moving the swivel plate 38 back and forth, the work W is moved between the grinding position G1 near the outer peripheral surface of the grindstone 14b and the grinding position G2 near the inner peripheral surface of the grindstone 14b, that is, from the outer peripheral side of the grindstone surface. It can reciprocate between the circumference side.

With reference to FIGS. 2 to 5, a pressing portion 44 for pressing the work W against the grindstone 14b is attached to the grindstone mounting plate 18a on the grindstone 14a side when grinding one side (lower surface) of the work W. The pressing portion 44 includes a slide base 44a and a slide portion 44b. The slide base 44a is provided parallel to the grindstone 14a in a side view. The slide portion 44b is attached to the slide base 44a so as to be linearly slidable in the X direction, which is the same direction as the reciprocating movement of the swivel unit 36. The front portion of the slide base 44a is fixed to the grindstone mounting plate 18a via a plurality of (two in this embodiment) connecting members 44c and the fixing plate 44d, and the rear portion of the slide base 44a is plural (in this embodiment). It is fixed to the grindstone mounting plate 18a via the connecting members 44e of (2). At this time, the slide base 44a, the connecting member 44c, and the fixing plate 44d are integrated by the bolt 44f. The fixing plate 44d and the grindstone mounting plate 18a are integrated by bolts 44g. The slide base 44a, the connecting member 44e, and the grindstone mounting plate 18a are integrated by bolts 44h.

Further, the double-headed surface grinding apparatus 10 includes a connecting portion 46 for connecting the swivel plate 38 and the pressing portion 44 when grinding one side (lower surface) of the work W. The connecting portion 46 includes a first engaging portion 48 attached to the slide portion 44b of the pressing portion 44 and a second engaging portion 50 attached to the upper surface of the swivel plate 38 and capable of engaging with the first engaging portion 48. including. The first engaging portion 48 includes a connecting arm 48a attached to the sliding portion 44b by a bolt 52, and a rotatable roller 48c attached to the tip end portion of the connecting arm 48a via a supporting portion 48b. The second engaging portion 50 is formed in a disk shape and has a groove portion 50a. The second engaging portion 50 is fixed to the upper surface of the swivel plate 38 by a bolt 54 so as to revolve around the rotation center C (see FIG. 5) of the swivel plate 38 as the swivel plate 38 rotates. The groove portion 50a is formed on the upper surface of the second engaging portion 50 so as to follow the locus P of the central portion of the second engaging portion 50 when the second engaging portion 50 revolves. Therefore, both ends of the groove 50a are opened in the rotation direction of the swivel plate 38. As a result, when the swivel plate 38 swivels and the work pocket 38a is positioned on the grinding position side, the roller 48c fits into the groove portion 50a and the first engaging portion 48 and the second engaging portion 50 engage with each other. Then, the swivel plate 38 and the slide portion 44b (pressing portion 44) are connected by the connecting portion 46. In this state, when the swivel plate 38 is moved in the X direction by the front-rear movement unit 34, the connected slide portion 44b is also moved in the front-rear direction in synchronization.

The grindstone mounting plate 18a to which the pressing portion 44 is attached is fixed to the column 12 by a fixture (not shown) so that it cannot rotate in the state shown in FIGS. 2 and 3. However, the grindstone mounting plate 18a, the pressing portion 44, and the first engaging portion 48 are movable in the feeding direction indicated by the arrow V in FIG. Therefore, before inserting the work W between the pressing portion 44 and the grindstone 14b, the pressing portion 44 is positioned upward so that the distance between the pressing portion 44 and the grindstone 14b is slightly larger than the thickness of the work W. After inserting the work W, the pressing portion 44 can be pushed into the work W by the feeding operation.

In this embodiment, the front-back moving unit 34 corresponds to the first operating unit. The swivel unit 36 corresponds to the second operating unit. The swivel plate 38 corresponds to the accommodating portion. The feeding device 30a corresponds to the feeding unit. The grindstone unit U1 is composed of the grindstone 14a, the grindstone mounting plate 18a, the grindstone shaft 22a and the support portion 24a, and the grindstone unit U2 is composed of the grindstone 14b, the grindstone mounting plate 18b, the grindstone shaft 22b and the support portion 24b. ..

Next, the main operation of the double-headed surface grinder 10 will be described.

The single-sided machining operation of the work W will be described with reference to FIGS. 1 to 5.

First, the distance between the grindstones 14a and 14b is set to a predetermined interval for single-sided grinding, and the grindstone 14b is set to a predetermined rotation speed while the rotation of the grindstone 14a is stopped.

Then, the work W is supplied to each work pocket 38a of the swivel plate 38 located at the supply position S1 by a loading device (not shown), and the rotating shaft 36a and the support portion 36c of the swivel unit 36 are rotated 180 degrees to swivel. The plate 38 is rotated 180 degrees. Then, the roller 48c is fitted into the groove 50a, the first engaging portion 48 and the second engaging portion 50 are engaged with each other, and the work W is moved to the standby position S2 on the grinding position side on the guide plate 42. To.

Next, the work W housed in the work pocket 38a is moved to the grinding position G1 by the front-rear moving unit 34, and then the reciprocating operation between the grinding position G1 and the grinding position G2 of the work W is started. At the same time that the work W is moved to the grinding position G2, the feeding device 30a starts feeding the pressing portion 44 attached to the grindstone mounting plate 18a that has stopped rotating. Then, the pressing portion 44 gradually descends and comes into contact with the upper surface of the work W, gradually presses the work W against the grindstone 14b, and the lower surface of the work W is processed by the rotating grindstone 14b. During machining, the work W repeats a reciprocating motion from the grinding position G1 to the grinding position G2, and the lower surface of the work W is machined using the entire or substantially the entire grinding surface of the grindstone 14b.

According to such a double-headed surface grinder 10, when grinding one side (lower surface) of the work W, the work W housed in the work pocket 38a of the swivel plate 38 is sandwiched between the pressing portion 44 and the grindstone 14b. The pressing portion 44 is fed in the V direction with respect to the work W. Then, while the pressing portion 44 presses one main surface (upper surface) of the work W, the grindstone 14b grinds the other main surface (lower surface) of the work W. At the time of single-sided grinding of the work W, the swivel plate 38 is reciprocated together with the work W in the X direction orthogonal to the V direction, and the pressing portion 44 is moved along with the reciprocating movement of the work W in the X direction. In this way, by pushing the work W being machined by the pressing portion 44 and reciprocating the work W on the grindstone surface of the grindstone 14b, the work W can be machined on one side using the entire grindstone surface or substantially the entire grindstone surface. Further, while the main surface of the work W, which is not processed, is pressed by the pressing portion 44, the work W and the pressing portion 44 reciprocate integrally in synchronization with each other, so that the work W is not scratched or chipped. Therefore, the flatness of the grindstone 14b can be maintained for a long time, and the processing accuracy is stable. Further, the frequency of dressing for modifying the grindstone surface of the grindstone 14b and the amount of wear of the grindstone due to the dress can be suppressed, and the life of the grindstone 14b can be extended. Further, it is not necessary to remove the grindstone 14a even during single-sided processing. As a result, even when grinding one side of the work W, it is possible to perform grinding that is economically excellent in production efficiency while maintaining processing accuracy.

At the time of single-sided machining, the slide portion 44b can push the work W while performing the same reciprocating operation as the work W, and the pressing portion 44 can be easily configured.

When the swivel plate 38 is reciprocated in the X direction by the front-rear moving unit 34 during single-sided machining, the slide portion 44b connected to the swivel plate 38 via the connecting portion 46 is reliably moved in the X direction together with the swivel plate 38 and the work W. Can move back and forth.

When the work W is on the grinding position side during single-sided machining, the first engaging portion 48 and the second engaging portion 50 engage with each other to reciprocate the swivel plate 38, the slide portion 44b, and the work W. Is surely interlocked, and the grinding work becomes smooth. On the other hand, when the work W is in the supply position S1, the first engaging portion 48 and the second engaging portion 50 do not engage with each other, so that the work W does not move undesirably and the work W can be replaced. It will be smooth.

Further, when the work W is double-sided processed by the double-headed surface grinder 10, the pressing portion 44 is removed from the grindstone mounting plate 18a, and the fixture for stopping the rotation of the grindstone 14a is also removed, so that the grindstone 14a is the same as the grindstone 14b. It is returned to a rotatable state and used. The work W housed in the work pocket 38a of the swivel plate 38 is moved from the supply position S1 to the standby position S2 by swiveling the swivel plate 38 by 180 degrees, and then between the grinding position G1 and the grinding position G2. The reciprocating motion is repeated during machining, and the grindstones 14a and 14b are machined using the entire machined surface or substantially the entire machined surface. As a result, both sides of the work W can be processed at the same time.

In this way, with one double-headed surface grinder 10, single-sided processing and double-sided processing of the work W can be easily performed, and the cost can be suppressed.

In the above-described embodiment, one swivel plate 38 is used, but the present invention is not limited to this. As shown in FIG. 6, two swivel plates 56 may be used. In this example, two swivel plates 56 are symmetrically provided on the upper surface of the disc-shaped support portion 60 arranged inside the through hole 58a of the guide plate 58. In this case, while the work W housed in the work pocket 56a of one swivel plate 56 is located at the standby position S2, the processed work W housed in the work pocket 56a of the other swivel plate 56 is supplied to the supply position S1. It can be replaced with the work W before processing, and the productivity can be increased.

Further, three swivel plates may be provided at intervals of 120 degrees. In this case, each swivel plate may be swiveled in units of 120 degrees, and a predetermined operation of processing, cleaning (measurement), and attachment / detachment may be performed at each location. Further, four swivel plates may be provided at 90 degree intervals. In this case, each swivel plate may be swiveled in units of 90 degrees so that a predetermined operation of processing, cleaning, measurement, and attachment / detachment may be performed at each location.

In the above-described embodiment, when the work W is ground on one side, the vertical position of the grindstone 14b is fixed, the pressing portion 44 is lowered together with the grindstone 14a by the feeding device 30a, and the work W is ground by the grindstone 14b. However, it is not limited to this. The work W may be ground while the pressing portion 44 is lowered by the feeding device 30a and the grindstone 14b is raised by the feeding device 30b. In this case, the feeding devices 30a and 30b correspond to the feeding unit. Further, the vertical position of the pressing portion 44 may be fixed, and only the grindstone 14b may be raised by the feeding device 30b to grind the work W. In this case, the feeding device 30b corresponds to the feeding unit.

In the above-described embodiment, the pressing portion 44 is attached to the grindstone mounting portion 18a, but the present invention is not limited to this. The pressing portion 44 may be provided on one side of the grindstone 14a, in other words, on the side of the grindstone 14a that does not rotate during single-sided grinding. That is, the pressing portion 44 may be provided on one of the grindstone units U1. For example, the pressing portion 44 may be attached to the grindstone shaft 22a or the supporting portion 24a. Further, the pressing portion 44 may be attached to the grindstone mounting plate 18a, the grindstone shaft 22a or the support portion 24a in the grindstone unit U1 in which the grindstone 14a is removed from the grindstone mounting plate 18a.

In the above-described embodiment, the pressing portion 44 is configured such that the slide portion 44b itself reciprocates in the second direction as the work W reciprocates in the second direction, but the present invention is not limited to this. As for the pressing portion, it is sufficient that the member in contact with the work can move with the reciprocating movement of the work in the second direction. For example, the pressing portion includes two pulleys provided at intervals in the second direction and a sheet-shaped member wound around these pulleys, and the sheet-shaped member contacts the work to press the work. The sheet-like member may be configured to rotate in both directions as the work reciprocates in the second direction. Further, the pressing portion may include a roller, and the roller may come into contact with the work to press the work, and the roller may be configured to rotate in both directions as the work reciprocates in the second direction.

In the above-described embodiment, the case where the work W is conveyed from the supply position S1 to the standby position S2 on the grinding position side by turning has been described, but the present invention is not limited to this. The work W may be transported by turning from the supply position S1 to the grinding position G1 or G2 on the grinding position side.

In the above-described embodiment, the work W is conveyed between the supply position S1 and the grinding position side by rotating the swivel plate 38, but the present invention is not limited to this. The work W may be linearly conveyed between the supply position S1 and the grinding position side.

The double-headed surface grinder according to the present invention can grind not only a positive type but also a negative type throw-away tip in which the angle between the main surface and the side surface is 90 degrees, and the cross-sectional shape is circular, triangular, square, or rhombic. Any throwaway tip such as can be ground.

In the above-described embodiment, the case where the present invention is applied to a vertical double-headed surface grinder has been described, but the present invention can also be applied to a horizontal double-headed surface grinder.

The grinding method according to the present invention can also be applied to a grinder dedicated to single-sided grinding in which one side of a work is ground by a grindstone while the work is sandwiched between a pressing portion and a grindstone.

10 Vertical double-headed surface grinder 14a, 14b Grindstone 18a, 18b Grindstone mounting plate 28a, 28b, 34c, 36b Drive motor 30a, 30b Feeding device 34 Forward / backward movement unit 36 Swing unit 38,56 Swing plate 42 Guide plate 44 Pressing part 44a Slide base 44b Slide part 46 Connecting part 48 First engaging part 50 Second engaging part G1, G2 Grinding position S1 Supply position S2 Standby position U1, U2 Grindstone unit W work

Claims (5)

A double-headed surface grinder capable of grinding both main surfaces of a work piece using a pair of grindstones arranged so as to face each other at intervals in the first direction.
A housing unit for accommodating the work and
A first moving unit that reciprocates the accommodating unit together with the work in a second direction orthogonal to the first direction,
A pressing portion provided on one of the grindstone sides so that the work can be moved along with the reciprocating movement of the work in the second direction while pressing one main surface of the work accommodated in the accommodating portion.
In order to grind the other main surface of the work with the other grindstone while the work is sandwiched between the pressing portion and the other grindstone, at least one of the pressing portion and the other grindstone is pressed against the work. A double-headed surface grinder provided with a feeding portion for feeding in the first direction. The pressing portion includes a slide base provided on the one side of the grindstone and a slide portion slidable in the second direction with respect to the slide base and pressing one main surface of the work. Item 2. The double-headed surface grinder according to Item 1. The double-headed surface grinder according to claim 2, further comprising a connecting portion that connects the sliding portion and the accommodating portion. Further including a second moving portion that moves the accommodating portion in order to switch the position of the work accommodated in the accommodating portion between the supply position and the grinding position side.
The connecting portion includes a first engaging portion provided on the slide portion and a second engaging portion provided on the accommodating portion and capable of engaging with the first engaging portion.
The double-headed surface grinder according to claim 3, wherein the first engaging portion and the second engaging portion engage with each other when the work is located on the grinding position side. It is a grinding method that grinds a workpiece using a pressing portion and a grindstone that are arranged facing each other at intervals in the first direction.
A storage process for housing the work in the storage unit,
At least one of the pressing portion and the grindstone is fed to the work in the first direction so as to sandwich the work between the pressing portion and the grindstone, and the pressing portion presses one main surface of the work. It also includes a grinding process that grinds the other main surface of the work with the grindstone.
In the grinding step, the accommodating portion is reciprocated together with the work in a second direction orthogonal to the first direction, and the pressing portion is reciprocated with the reciprocating movement of the work in the second direction. Method.

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