JP5285757B2 - Double-head grinding machine - Google Patents

Abstract

A double-headed grinder (1), wherein a carrier plate (30) comprises a pair of carrier parts (31, 32) that exhibit a fan-shaped outline form having a central angle (alpha) of less than 90°, centered around a carrier shaft, and upon which a plurality of work pockets (33) are formed. The carrier shaft (23) is installed at a boundary inside and outside a machining chamber cover (40) as viewed from the direction in which the center line (CL) of said carrier shaft (23) extends. The carrier parts (31, 32) enter and leave the inside of the machining chamber cover (40) in accordance with the rotation of the carrier shaft (23). The double-headed grinder (1), wherein the machining chamber cover (40) can be reduced in size and workpieces can be attached to and detached from the carrier plate (30) outside the machining chamber cover (40), is thus provided.

Description

  The present invention relates to a double-headed grinding machine, and more particularly, to a double-headed grinding machine of a through grinding method in which a plurality of workpieces are continuously ground using a carrier plate.

  2. Description of the Related Art A through-grinding double-head grinding machine that continuously grinds a plurality of workpieces using a carrier plate is known (for example, see Patent Document 1). This type of double-head grinding machine rotates a carrier plate on which a plurality of work pockets for holding a work are formed, and carries the work held in the work pocket between a pair of rotating grindstones. Grind both sides of the workpiece sequentially.

Japanese Patent Laid-Open No. 5-8161

  By the way, the double-headed grinding machine is generally a processing chamber that covers the entire carrier plate including the processing region in order to prevent the coolant supplied when grinding the workpiece from scattering or leaking along the carrier plate. A cover is provided.

  For this reason, there existed a subject that a processing chamber cover will enlarge. In addition, there is a problem that the workpiece must be attached to and detached from the carrier plate inside the processing chamber cover, which is a space where the used coolant is likely to adhere and is limited.

  The present invention has been made in view of such circumstances, and provides a double-head grinding machine capable of reducing the size of the processing chamber cover and attaching / detaching the workpiece to / from the carrier plate outside the processing chamber cover. With the goal.

  In order to solve the above-mentioned problems, an invention according to claim 1 is directed to a pair of rotatable grindstones arranged opposite to each other, a rotatable carrier shaft, and a carrier shaft connected to the carrier shaft for holding a workpiece. A carrier plate in which a plurality of work pockets are formed, a carrier driving section for rotating the carrier shaft to carry the work held in the work pocket between the pair of rotating grindstones, and used during grinding And a processing chamber cover for suppressing splashing or leakage of the coolant, and the carrier plate exhibits an outer shape within a sector shape having a central angle of less than 90 degrees around the carrier axis. The carrier shaft has at least one carrier portion in which a plurality of work pockets are formed, and the carrier axis is viewed from the extension direction of the center line of the carrier axis. Is installed inside and outside the boundary of the processing chamber cover, according to the rotation of the carrier shaft, a double disk grinding machine, characterized in that the carrier part and out of the interior of the processing chamber cover.

According to this invention, scattering and leakage of coolant can be suppressed by the processing chamber cover having a compact configuration. In addition, since the carrier portion enters and exits the inside of the processing chamber cover, the workpiece can be attached to and detached from the carrier plate outside the processing chamber cover where the coolant is not attached and the layout is not easily restricted.
That is, it is possible to provide a double-head grinding machine that can reduce the size of the processing chamber cover and can attach and detach the workpiece to and from the carrier plate outside the processing chamber cover.

  In addition, the invention according to claim 2 is the double-headed grinding machine according to claim 1, wherein a pair of the carrier portions are arranged at positions facing each other with the carrier shaft interposed therebetween. .

  According to this invention, since the workpiece held on one carrier portion is ground inside the processing chamber cover, the workpiece can be attached to and detached from the other carrier portion outside the processing chamber cover. , Work efficiency can be improved.

  The invention according to claim 3 is the double-headed grinding machine according to claim 1 or 2, wherein the central angle around the carrier axis of the sector circumscribing the outer shape of the carrier portion is The work pocket is set at an angle that fits in a space between the grindstone and the inner surface of the processing chamber cover as viewed from the direction in which the center line of the carrier axis extends.

  According to this invention, since the supply of the coolant can be started or stopped in a state where the carrier portion is completely inside the processing chamber cover, the number of workpieces held in the carrier portion while suppressing the splashing and leakage of the coolant. Can be set to the maximum. Thereby, work efficiency improves more.

  The invention according to claim 4 is the double-headed grinding machine according to any one of claims 1 to 3, wherein the processing chamber cover includes an opening through which the carrier portion passes, and the opening. And a closing member capable of closing the portion.

  According to this invention, scattering and leakage of coolant from the opening can be suppressed.

  According to the present invention, it is possible to provide a double-head grinder capable of reducing the size of the processing chamber cover and attaching / detaching the workpiece to / from the carrier plate outside the processing chamber cover.

It is a figure which shows the whole structure of the double-headed grinding machine which concerns on one Embodiment of this invention, (a) is a top view, (b) is a side view. It is a front view of the double-headed grinding machine shown by FIG. It is a partial expanded longitudinal cross-sectional view which shows a mode that a workpiece | work is ground. It is an external view of a process chamber cover, (a) is a top view, (b) is a side view, (c) is a front view. It is a front view of a processing chamber cover when a shutter is in an open state. 5A and 5B are views for explaining a shutter guide structure, in which FIG. 4A is an enlarged view seen from the direction A in FIG. 4B, and FIG. 5B is an enlarged view around the shutter in FIG. It is a top view which shows a mode that a work is ground sequentially, (a) is a figure showing a state before a work is carried into grinding space, (b) is a figure showing a state at the time of grinding of a work, (C) is a figure which shows the state after the workpiece | work was carried out from the grinding space. It is a top view of the carrier plate which concerns on a modification.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a diagram showing the overall configuration of a double-head grinding machine according to an embodiment of the present invention, where (a) is a plan view and (b) is a side view. FIG. 2 is a front view of the double-headed grinding machine shown in FIG. FIG. 3 is a partially enlarged longitudinal sectional view showing a state in which the workpiece is ground.

  As shown in FIGS. 1 and 2, the double-headed grinding machine 1 is a double-headed grinding machine that uses a carrier plate 30 to continuously grind a plurality of workpieces W (see FIG. 3). In FIG. 1, the work is not shown for convenience of explanation. In addition, in order to clarify the explanation, the front, rear, left, right, and up and down directions are set as shown in FIGS.

  The double-head grinding machine 1 is movable in the vertical direction via a linear guide mechanism 11, 13 on the front surface of the bed 2 as a base, a main body frame 3 erected on the rear side of the bed 2, and the main body frame 3. A pair of main spindle units 4 and 5 are provided.

  The pair of spindle units 4 and 5 includes a pair of flanges 6 and 7 fixed to a pair of rotating shafts (not shown) arranged on the same vertical axis V, and a screw member or the like on the pair of flanges 6 and 7. A pair of grindstones 8 and 9 fixed to each other and a pair of grindstone driving motors (not shown) for rotating and driving the pair of rotating shafts are provided. The pair of grindstones 8 and 9 are disposed so that the surfaces on the grinding side face each other in the vertical direction. The grindstone driving motor is a built-in motor disposed on the outer peripheral side of the rotating shaft here, but is not limited to this, and the rotation is performed via a driving force transmission member such as a belt or a gear. The structure which rotationally drives an axis | shaft may be sufficient. The rotational speed and direction of each of the grindstones 8 and 9 can be changed.

  The pair of spindle units 4 and 5 convert the rotational driving force of the spindle unit driving motors 12 and 14 installed in the main body frame 3 into linear driving force by, for example, a feed screw mechanism (not shown). Thus, it is configured to be movable in the vertical direction.

  A pair of support arms 21, 21 are fixed to the left and right of the front side of the main body frame 3, and the carrier device 22 is attached between the pair of support arms 21, 21 via connection members 26, 26. Yes.

  The carrier device 22 rotates a carrier plate 30 formed with a plurality of work pockets 33 for holding a work W (see FIG. 3), a rotatable carrier shaft 23 connected to the carrier plate 30, and the carrier shaft 23. And a carrier driving motor (carrier driving unit) 25. The carrier driving motor 25 rotates a carrier shaft 23 via a driving force transmission mechanism 24 such as a gear reduction mechanism, thereby rotating a work W held in a work pocket 33 as shown in FIG. Can be carried into a grinding space G (see FIG. 3) between the grinding wheels 8 and 9.

  Further, the double-headed grinding machine 1 includes a processing chamber cover 40 for suppressing scattering or leakage of coolant used during grinding. The processing chamber cover 40 is configured to cover a processing region including the pair of grindstones 8 and 9.

  A cylindrical upper cover 51 covering the upper side of the flange 6 is attached to the lower part of the spindle unit 4, and a cylindrical lower cover 52 covering the lower side of the flange 7 is attached to the upper part of the spindle unit 5. Yes. The upper cover 51 is connected to the peripheral edge of the upper opening 41c (see FIG. 4A) of the processing chamber cover 40 via a hollow bellows member 53 that can be vertically expanded and contracted. It is connected to the peripheral edge of the lower opening 41d (see FIG. 4A) of the processing chamber cover 40 via a hollow bellows member 54 that can expand and contract in the direction. Accordingly, the sealing performance between the processing chamber cover 40 and the spindle units 4 and 5 is secured while allowing (absorbing) the vertical movement of the spindle units 4 and 5.

  The carrier plate 30 has a pair of carrier portions 31 and 32 having a fan-shaped outer shape having a central angle α (see FIG. 1A) of less than 90 degrees with the carrier shaft 23 as the center. The pair of carrier portions 31 and 32 are disposed at positions facing each other with the carrier shaft 23 interposed therebetween.

  A plurality of work pockets 33 are formed in each of the pair of carrier portions 31 and 32. The work pocket 33 is a through-hole along the vertical direction formed at equal angular intervals along the circumferential direction in the outer peripheral edge of the carrier portions 31 and 32. The inner diameter of the work pocket 33 is set to be slightly larger than the outer diameter of the work W (see FIG. 3), and the work W can be fitted and held in the work pocket 33.

  Immediately below the carrier plate 30, the lower surface of the workpiece W (see FIG. 3) is supported from a position facing the workpiece loading device 55 (see FIG. 7) to the upstream side of the grindstones 8 and 9 to support the grinding space G (see FIG. 3). A support plate (not shown) for guiding to (see) is provided. Similarly, a support plate (not shown) for guiding a workpiece W (see FIG. 3) that has been ground from a position immediately downstream of the grindstones 8 and 9 to a position just before the position facing the workpiece pick-up device 56 (see FIG. 7). Is installed.

  The carrier shaft 23 is installed at the boundary between the inside and the outside of the processing chamber cover 40 when viewed from the extending direction of the center line CL of the carrier shaft 23 (see FIG. 1A). The double-headed grinding machine 1 is configured such that the carrier portions 31 and 32 enter and leave the processing chamber cover 40 as the carrier shaft 23 rotates. Thereby, when one carrier part 31 (32) exists in the inside of the process chamber cover 40, with respect to the workpiece | work W (refer FIG. 3) hold | maintained at the work pocket 33 of the said one carrier part 31 (32). Thus, it is possible to perform grinding while sufficiently supplying the coolant, and to prevent the coolant from leaking to the outside of the processing chamber cover 40 by blocking the coolant at the surface portion of the carrier shaft 23 as will be described later.

  Further, as described above, since the center angle α of the carrier portion 31 (32) having a fan-shaped outer shape is less than 90 degrees, the outer diameter of the grindstones 8 and 9, the outer diameter of the carrier plate 30, and the distance between the two axes. Although the central angle α is further limited depending on the distance, the carrier portion 31 is used until all of the plurality of workpieces W (see FIG. 3) respectively held in the plurality of workpiece pockets 33 of the carrier portion 31 (32) are finished. It is possible to avoid the rotation direction side tip of (32) from coming out of the processing chamber cover 40 (see FIG. 7C). Similarly, the rotation direction side of the carrier part 31 (32) until the start of the start of the plurality of works W (see FIG. 3) held in the plurality of work pockets 33 of the carrier part 31 (32) is started. It is possible to realize that the rear end completely enters the inside of the processing chamber cover 40 (see FIG. 7A). For this reason, it can prevent that the coolant used during grinding leaks to the exterior of the process chamber cover 40 along the carrier part 31 (32).

  Here, the central angle α around the carrier axis 23 of the carrier portions 31 and 32 having a fan-shaped outer shape is the grindstones 8 and 9 and the processing chamber cover 40 when viewed from the direction in which the center line CL of the carrier axis 23 extends. The angle is set so that the work pocket 33 is just fit in the space between the inner surface of each of them (see FIGS. 7A and 7C). According to such a configuration, in the state where the carrier portion 31 (32) is completely inside the processing chamber cover 40, the coolant supply is started before or after the leading workpiece W (see FIG. 3) is ground. Since the coolant supply can be stopped after the tail workpiece W (see FIG. 3) is ground, the workpiece W (held by the carrier portions 31 and 32 is suppressed while preventing the coolant from being scattered and leaked to the outside of the processing chamber cover 40. The number can be set to the maximum. Thereby, work efficiency improves more. However, the center angle α of the carrier portions 31 and 32 is shown in FIGS. 7A and 7C so that the work pocket 33 can be accommodated in the space between the grindstones 8 and 9 and the inner surface of the processing chamber cover 40 with a sufficient margin. It goes without saying that the angle may be set smaller than the angle shown in FIG.

  4A and 4B are external views of the processing chamber cover, where FIG. 4A is a plan view, FIG. 4B is a side view, and FIG. 4C is a front view. FIG. 5 is a front view of the processing chamber cover when the shutter is in the open state. 6A and 6B are diagrams for explaining the guide structure of the shutter, in which FIG. 6A is an enlarged view seen from the direction A in FIG. 4B, and FIG. 6B is an enlarged view around the shutter in FIG. 4B. It is.

  As shown in FIG. 4, the processing chamber cover 40 includes a cover main body 41 that has a substantially rectangular parallelepiped box shape in which a plurality of plate-like bodies are combined, and the cover main body 41 covers a pair of grindstones 8 and 9. 1 cover part 41a and the 2nd cover part 41b extended in the front to the centerline CL of the carrier shaft 23 provided in a row with the 1st cover part 41a. The processing chamber cover 40 is fixed to the connecting members 26 and 26 (see FIG. 1A) by a screw member (not shown) or the like, for example, and an inspection opening / closing door (not shown) or the like is provided. ing.

  An upper opening 41c is formed on the upper surface of the first cover portion 41a so that the lower end of the bellows member 53 is connected to the periphery, and the lower end of the bellows member 54 is connected to the periphery on the lower surface of the first cover portion 41a. A lower opening 41d is formed.

  As shown in FIG. 5, a notch 48 in which the rear half of the carrier shaft 23 is fitted is formed on the lower front side of the second cover portion 41 b, and the notch 48 is formed on the carrier shaft 23. An upper end portion 48a facing the upper end surface, a semicircular opening portion 48b facing the semicircular portion on the base side on the side surface of the carrier shaft 23, and a side end portion facing the generatrix portion in the vertical direction on the side surface of the carrier shaft 23 48c. A rubber seal member (not shown), for example, is installed inside the semicircular opening 48 b, so that the base side of the side surface of the semicircular opening 48 b of the processing chamber cover 40 and the carrier shaft 23 is arranged. Sealing performance with the semicircular part is ensured.

  As shown in FIGS. 4 and 5, openings 42 and 43 through which the carrier portions 31 and 32 pass are formed in communication with the notch 48 on both sides in the left-right direction of the notch 48. The processing chamber cover 40 includes a shutter (closing member) 44 that can close the openings 42 and 43. If it does in this way, scattering and leakage of coolant from opening parts 42 and 43 can be controlled.

  The shutter 44 is integrally formed with a right shutter portion 44a that can close the opening portion 42, a left shutter portion 44b that can close the opening portion 43, and a connection portion 44c that connects the right shutter portion 44a and the left shutter portion 44b. , Glasses shape. However, it is possible to adopt a configuration in which the right shutter portion 44a and the left shutter portion 44b are separated.

  The shutter 44 is held so as to be slidable in the vertical direction between a pair of side guide members 47 and 47 having an L-shaped cross section fixed to the left and right of the front surface side of the second cover portion 41b. Also, a pair of lower guide members 45, 45 having an L-shaped cross section that holds the lower end of the shutter 44 when the shutter 44 is closed are fixed to the lower left and right of the front surface side of the second cover portion 41b. The shutter 44 can be moved up and down by a shutter driving device (not shown) to open or close the openings 42 and 43. Examples of the shutter drive device include, but are not limited to, a configuration in which a pinion gear meshed with a rack provided in the shutter 44 extending in the vertical direction is driven by a motor (both not shown). It is not a thing.

  For example, a rubber seal member 46 is fixed to the periphery of the rear surface (back surface) of the shutter 44. Here, the outer shape of the seal member 46 substantially matches the outer shape of the shutter 44, but the side end of the right shutter portion 44a on the connection portion 44c side and the side end of the left shutter portion 44b on the connection portion 44c side. And the outer shape of the inverted U-shaped portion 46 a located at the lower end of the connecting portion 44 c protrudes outward from the outer shape of the shutter 44, that is, in the notch 48. According to this configuration, when the openings 42 and 43 are closed by the shutter 44, the inverted U-shaped portion 46a is pressed against the upper end surface of the carrier shaft 23 and the vertical bus portion of the side surface of the carrier shaft 23. Can do. Accordingly, the upper end 48 a of the notch 48 of the processing chamber cover 40 and the upper end surface of the carrier shaft 23, and the upper and lower sides of the side end 48 c of the notch 48 of the processing chamber cover 40 and the side surface of the carrier shaft 23. Sealing performance is ensured between the direction busbar part.

  Convex portions 49a projecting forward from the front surface of the shutter 44 are provided at the upper left and right corners of the front surface of the shutter 44, and the lower left and right corner portions of the front surface of the shutter 44 are disposed forward of the front surface of the shutter 44. Convex part 49b which protrudes in is provided. With this configuration, when the openings 42 and 43 are closed by the shutter 44, the convex portion 49a contacts the inner surface 47a of the side guide member 47 and the convex portion 49b contacts the inner surface 45a of the lower guide member 45. The seal member 46 can be pressed against the front surface of the second cover portion 41b by moving the shutter 44 to the second cover portion 41b side. Thereby, sealing performance is ensured between the openings 42 and 43 of the processing chamber cover 40 and the outside.

  The shutter 44, the seal member 46, the openings 42 and 43, and the notch 48 are not limited to the forms shown in FIGS. 4 to 6, and the shape and size thereof can be changed as appropriate.

  Next, with reference to FIG.1 and FIG.7, an effect | action of the double-headed grinding machine 1 comprised as mentioned above is demonstrated. FIG. 7 is a plan view schematically showing how workpieces are sequentially ground, (a) is a diagram showing a state before the workpiece is brought into the grinding space, and (b) is a state during grinding of the workpiece. (C) is a figure which shows the state after the workpiece | work was carried out from the grinding space. In FIG. 7, the work is not shown for convenience of explanation.

  When grinding the workpiece W (see FIG. 3, the same applies hereinafter), the double-head grinding machine 1 moves and adjusts the spindle units 4 and 5 in the vertical direction by the spindle unit driving motors 12 and 14, thereby making a pair of grindstones 8. , 9 is set to a predetermined value. The double-head grinding machine 1 rotates the pair of grindstones 8 and 9 by a grindstone driving motor (not shown), and the carrier plate 30 attached to the carrier shaft 23 by the carrier driving motor 25 is indicated by an arrow in FIG. Rotate in the direction.

  FIG. 7A shows a state immediately before the leading work W held in the work pocket 33 of the carrier part 31 is carried into the grinding space G (see FIG. 3, the same applies hereinafter). The grinding of the workpiece W held on the carrier portion 31 will be mainly described in order from the stage of mounting on the workpiece pocket 33 of the carrier portion 31.

  First, when each work pocket 33 of the carrier part 31 is on the upstream side of the opening 42 of the processing chamber cover 40 (see FIG. 4C, the same applies hereinafter), the work pocket 33 is moved upward into the work pocket 33. The workpiece W is loaded and mounted. Thereby, the work W is held in the work pocket 33. Note that the lower surface of the workpiece W is supported by a support plate (not shown).

  Subsequently, when the carrier portion 31 is located at the position of the carrier portion 32 in FIG. 7C, that is, when the front end in the rotational direction of the carrier portion 31 comes immediately upstream of the opening 42 of the processing chamber cover 40, the shutter 44 ( 4C, the same applies hereinafter) is moved upward to open the opening 42 and the opening 43 of the processing chamber cover 40 (see FIG. 4C, the same applies hereinafter). At this time, the rotation direction side tip of the other carrier part 32 is located immediately upstream of the opening 43 of the processing chamber cover 40.

  The carrier plate 30 continues to rotate, and the carrier part 31 holding the work W in the work pocket 33 enters the inside of the processing chamber cover 40 through the opening 42. On the other hand, the carrier part 32 goes out of the processing chamber cover 40 through the opening 43.

  As shown in FIG. 7A, when the rear end in the rotation direction of the carrier portion 31 comes directly downstream of the opening 42 of the processing chamber cover 40, the leading workpiece W is at a position immediately before the start of grinding, The shutter 44 is moved downward to close the opening 42 and the opening 43 of the processing chamber cover 40. At this time, the rear end of the other carrier part 32 in the rotational direction is located immediately downstream of the opening 43 of the processing chamber cover 40.

  When the opening 42 and the opening 43 of the processing chamber cover 40 are closed by the shutter 44, the supply of coolant is started. At this time, since the inside of the processing chamber cover 40 is sealed with respect to the outside, scattering and leakage of the coolant are suppressed.

  Subsequently, as shown in FIG. 7B, the carrier portion 31 holding the workpiece W in the workpiece pocket 33 is carried into the grinding space G between the pair of rotating grindstones 8 and 9, and the workpiece W is moved up and down. The end face is ground.

  As shown in FIG. 7C, when the tip in the rotational direction of the carrier portion 31 comes directly upstream of the opening 43 of the processing chamber cover 40, the last workpiece W is at a position immediately after the end of grinding, The coolant supply is stopped. At this time, the rotation direction side tip of the other carrier portion 32 is located immediately upstream of the opening 42 of the processing chamber cover 40.

  When the supply of coolant is stopped, the shutter 44 is moved upward to open the opening 42 and the opening 43 of the processing chamber cover 40. At this time, since the coolant is not supplied, there is no scattering or leakage of the coolant. In addition, before the opening part 42 and the opening part 43 are open | released, it is preferable that the carrier part 31 with which the workpiece | work W was hold | maintained is air blown.

  The rotation of the carrier plate 30 continues, and the carrier part 31 holding the work W in the work pocket 33 goes out of the processing chamber cover 40 through the opening 43. On the other hand, the carrier portion 32 enters the processing chamber cover 40 through the opening 42.

  When each work pocket 33 of the carrier portion 31 is on the downstream side of the opening 43 of the processing chamber cover 40, the work W moves downward due to its own weight and is detached from the work pocket 33, and the work take-out device 56. Is taken out to the outside. Note that the bottom surface of the workpiece W is supported by a support plate (not shown) until just before the position facing the workpiece picking device 56.

  Subsequently, when the carrier portion 31 is located at the position of the carrier portion 32 in FIG. 7A, that is, when the rear end in the rotation direction of the carrier portion 31 comes directly downstream of the opening 43 of the processing chamber cover 40, the shutter 44. Is moved downward to close the opening 42 and the opening 43 of the processing chamber cover 40. At this time, the rear end of the other carrier portion 32 in the rotational direction is located immediately downstream of the opening 42 of the processing chamber cover 40.

  During the grinding process, the rotation of the carrier plate 30 is continued, and the workpiece W held on the carrier part 31 is repeatedly ground. Here, the opening / closing operation of the openings 42 and 43 by the shutter 44 is controlled based on the measured value by measuring the rotational angle position of the carrier plate 30. The grinding of the workpiece W held on the carrier portion 32 is performed with a phase shifted by a half rotation of the carrier plate 30 with respect to the grinding of the workpiece W held on the carrier portion 31, but the contents of the processing are the same. Therefore, detailed description is omitted.

  As described above, in the double-head grinding machine 1 of the present embodiment, the carrier plate 30 has a fan-shaped outer shape having a central angle α of less than 90 degrees with the carrier shaft 23 as the center, and a plurality of work pockets 33 are formed. The carrier shaft 23 is installed at the boundary between the inside and outside of the processing chamber cover 40 when viewed from the direction in which the center line CL of the carrier shaft 23 extends, and the carrier shaft 23 rotates. Accordingly, the carrier portions 31 and 32 enter and leave the processing chamber cover 40.

Therefore, according to the present embodiment, the processing chamber cover 40 having a compact configuration can suppress the scattering and leakage of the coolant. In addition, since the carrier portions 31 and 32 enter and exit from the inside of the processing chamber cover 40, the workpiece W is attached to and detached from the carrier plate 30 outside the processing chamber cover 40 where the coolant is not attached and the layout is not easily restricted. Can do.
That is, it is possible to provide a double-head grinding machine that can reduce the size of the processing chamber cover and can attach and detach the workpiece to and from the carrier plate outside the processing chamber cover.

  In the present embodiment, a pair of carrier portions 31 and 32 are disposed at positions facing each other with the carrier shaft 23 interposed therebetween. According to such a configuration, while the workpiece W held by one carrier portion 31 (32) is ground inside the processing chamber cover 40, the workpiece W with respect to the other carrier portion 32 (31) is ground. Since attachment and detachment can be performed outside the processing chamber cover 40, work efficiency can be improved.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure described in the said embodiment, The combination thru | or selecting suitably the structure described in the said embodiment is included. The configuration can be changed as appropriate without departing from the spirit of the invention.

  For example, in the said embodiment, although the carrier parts 31 and 32 of the carrier plate 30 are exhibiting the fan-shaped external shape, this invention is not limited to this. As shown in FIG. 8, the carrier portions 31 a and 32 a of the carrier plate 30 a only have to have an outer shape within a sector shape having a central angle α of less than 90 degrees with the carrier axis 23 as the center. For example, in the modification shown in FIG. 8, the carrier portions 31 a and 32 a are connected to the arcuate plate portions 31 b and 32 b in which the work pockets 33 are formed and the inner peripheral central portion of the arcuate plate portions 31 b and 32 b in the radial direction. Each has arm portions 31c and 32c extending inward.

  Moreover, in the said embodiment, although the carrier plate 30 has a pair of carrier parts 31 and 32, this invention is not limited to this, The center of less than 90 degree | times centering on the carrier axis | shaft 23 It may be a carrier plate having one carrier portion that exhibits an outer shape within a sector shape having an angle α.

  In the embodiment, the shutter 44 that can move up and down is exemplified as the closing member that can close the openings 42 and 43 of the processing chamber cover 40, but the present invention is not limited to this. For example, the closing member may have a configuration in which an upper portion of a rectangular rubber plate (not shown) is fixed to the upper edge portions of the openings 42 and 43. In this case, when the carrier portions 31 and 32 enter and exit the processing chamber cover 40, the rubber plates are pressed and deformed by the carrier portions 31 and 32 to open the openings 42 and 43, and the carrier portions 31 and 32 are When separated from the rubber plate, the rubber plate is restored and the openings 42 and 43 can be closed.

  Moreover, although the case where the shape of the workpiece | work W was a column shape was illustrated in the said embodiment, the shape of the workpiece | work W is arbitrary if it is a shape which can be ground with the double-headed grinding machine 1, for example, pin shape, coin shape Other than the circular shape, it may be an irregular shape.

  Moreover, in the said embodiment, although the rotating shaft of the grindstone demonstrated the vertical double-headed grinding machine 1 along a perpendicular direction, this invention is not limited to this, For example, the rotating shaft of a grindstone is horizontal. It can also be applied to a horizontal double-head grinding machine.

1 Double-head grinding machine 2 Bed 3 Body frame 8, 9 Grinding wheel 23 Carrier shaft 25 Carrier drive motor (carrier drive unit)
30, 30a Carrier plate 31, 32, 31a, 32a Carrier part 33 Work pocket 40 Processing chamber cover 42, 43 Opening 44 Shutter (closing member)
CL Center line W Work α Center angle

Claims (4)

A pair of rotatable grindstones arranged opposite each other;
A rotatable carrier shaft;
A carrier plate connected to the carrier shaft and formed with a plurality of work pockets for holding a work;
A carrier driving unit for rotating the carrier shaft to carry the work held in the work pocket between the pair of rotating grindstones;
A processing chamber cover for suppressing scattering or leakage of coolant used during grinding,
The carrier plate has at least one carrier portion having an outer shape within a sector shape having a central angle of less than 90 degrees centered on the carrier axis and having a plurality of work pockets formed therein,
The carrier shaft is installed at an inner and outer boundary portion of the processing chamber cover as seen from the extending direction of the center line of the carrier shaft,
The double-head grinding machine according to claim 1, wherein the carrier portion enters and exits the inside of the processing chamber cover as the carrier shaft rotates.   2. The double-head grinding machine according to claim 1, wherein a pair of the carrier portions are arranged at positions facing each other with the carrier shaft interposed therebetween.   The central angle centered on the fan-shaped carrier axis circumscribing the outer shape of the carrier part is in the space between the grindstone and the inner surface of the processing chamber cover as viewed from the direction of extension of the center line of the carrier axis. The double-headed grinding machine according to claim 1 or 2, wherein the angle is set so that the work pocket is accommodated.   The double-headed grinding according to any one of claims 1 to 3, wherein the processing chamber cover includes an opening through which the carrier portion passes and a closing member capable of closing the opening. Board.

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