JP7316665B2 - Out-of-machine centering method for eccentric workpiece in grinder, out-of-machine centering device therefor, and chuck of grinder - Google Patents

Description

The present invention is an eccentricity in a grinder in which the eccentric portion of an eccentric work is centered outside the chuck of the grinder, and the centered eccentric work is transferred to the chuck of the grinder for grinding. The present invention relates to an off-machine centering method for a workpiece, an off-machine centering device, and a chuck of a grinder.

A conventional eccentric workpiece centering method and its apparatus are disclosed in Patent Document 1, and the outline thereof is illustrated in FIGS. 16 to 18. FIG. That is, the center _C2 of the eccentric portion B, which is eccentric with respect to the center _C1 of the shaft portion A of the eccentric workpiece W by the amount of eccentricity (e), is the center of the spindle shaft that is the processing center of the grinding machine G (hereinafter referred to as The "centering" of the eccentric work W to match C ₀ (referred to as the "spindle axis") is achieved by providing an eccentric clamping device J' in the chuck 40' of the grinder G, and attaching the eccentric work W to the eccentric clamping device J'. was done by setting That is, the eccentric clamping device J' includes a V block portion 51 and a plurality of clamp cylinders 52 for clamping the shaft portion A of the eccentric workpiece W set on the V block portion 51. By clamping the shaft portion A of the eccentric work W with the V-block portion 51 at a position eccentric to the spindle shaft center _C0 by the eccentricity (e), the shaft center _C2 of the eccentric portion B is aligned with the spindle shaft. It is a device that matches the heart C ₀ . In the eccentric workpiece W, as shown in FIG. 17, the eccentric portion B is provided in the intermediate portion of the shaft portion A, so that the shaft portions A are present on both sides of the eccentric portion B, and the eccentric work W is eccentric. The portion B is often arranged at a position shifted from the center of the shaft portion A in the axial direction.

A conventional centering device for an eccentric workpiece W consists of the eccentric clamping device J′ provided in the chuck 40′ and the eccentric clamping device J′ provided in the chuck 40′. In order to rotate (rotate) the eccentric workpiece W, a workpiece rotating device F' arranged opposite to the chuck 40' and a pair of contacts on the upper and lower sides of the eccentric part B during the same centering. A sizing device D' for detecting the position of the center _C2 of the eccentric portion B in the height direction by bringing the elements 53a and 53b into contact with each other. A pair of contactors 53a and 53b of the sizing device D' are provided so as to face the distal end portions of rotating arms 54a and 54b that rotate around a specific fulcrum. The axis C ₁₁ of the chuck 61 of the work rotating device F′ coincides with the center C ₁ of the shaft portion A of the eccentric work W supported by the V block portion 51 of the grinding machine G, and the spindle axis C ₀ In contrast, it is displaced in the horizontal direction by the amount of eccentricity (e).

In order to center the eccentric portion B of the eccentric work W, the shaft portion A of the eccentric work W is supported in an unclamped state by the V block portion 51 provided in the chuck 40' of the grinding machine G, and the A pair of sizing devices D' are mounted above and below the eccentric portion B while the portion of the shaft portion A protruding from the chuck 40' of the grinding machine G is gripped by the chuck 61 of the work rotating device F'. The contactors 53a and 53b are brought into contact with each other, and the distances _a1 and _a2 from the spindle axis _C0 to the upper and lower sides of the eccentric portion B are measured, and the distances _a1 and _a2 are the same. , the eccentric part B is centered by rotating (pivoting) the eccentric workpiece W by the workpiece rotating device F'. In FIG. 18, the chain double-dashed line indicates a state in which the center _C2 of the eccentric portion B of the eccentric workpiece W and the spindle axis _C0 do not match. Detected by the contactors 53a and 53b, the shaft portion is rotated by the work rotating device F' so that the center _C2 of the eccentric portion B of the eccentric work W and the spindle axis _C0 coincide with each other as indicated by the solid line. The eccentric work W is rotated around the center C ₁ of A. Here, the grinding of the centered eccentric portion B can be made into a processed product with a minimum grinding allowance, so the grinding efficiency is good, but the grinding of the eccentric portion B that is not accurately centered must be performed until the processed product is produced. If the grinding allowance (amount) increases, and if it is excessive, an unground portion such as black scale remains, resulting in a defective product.

16 and 18, a rotating shaft 62 of a chuck 61 of a workpiece rotating device F' is controlled and rotated by a servomotor 63, and the workpiece rotating device F' is moved through a support 65 by a chuck advancing/retreating cylinder 64. It is guided by the guide rail 66 to advance and retreat with respect to the chuck 40' of the grinder G. As shown in FIG. 16 and 18, reference numerals 55 and 56 denote the face plate and rotary grindstone of the chuck 40' of the grinder G, respectively, and 61a denotes a pair of chuck claws constituting the chuck 61 of the work rotating device F'. show.

As described above, the centering of the eccentric portion of the eccentric workpiece W in the conventional art is performed using the V block portion 51 provided in the chuck 40' of the grinding machine G, and therefore, the centering of the eccentric workpiece W is often performed. time, and during the centering operation, the actual grinding operation of the grinder cannot be performed. As a result, the operating rate of the grinding machine, which is the ratio of the time spent grinding to the total time, is low, resulting in a decrease in machining productivity.

JP 2010-173005 A

An object of the present invention is to center the eccentric part of the eccentric workpiece outside the grinding machine, and transfer the centered eccentric workpiece outside the machine to the chuck of the grinding machine. To increase the operating rate of a grinding machine by eliminating the need for centering in a grinding machine, thereby enhancing the productivity of machining an eccentric work by the grinding machine.

The first aspect of the invention for solving the above-mentioned problems is to perform centering so that the axis of the eccentric part that is eccentric with respect to the shaft part of the eccentric work coincides with the spindle axis of the grinder that is the center of processing. , an off-machine centering method for an eccentric workpiece in a grinder performed outside the chuck of the grinder,
Outside the grinding machine, the eccentric part of the eccentric work is centered, and while maintaining the centered state of the eccentric work, the shaft part of the eccentric work is moved by the transfer hand of the eccentric work conveying device. The eccentric work is centered by gripping, conveying, transferring, and clamping to the eccentric clamping device of the chuck of the grinding machine.

According to the invention of claim 1, by using the apparatus for centering an eccentric work outside the machine according to claim 2, the center of the eccentric part of the eccentric work can be adjusted outside the chuck of the grinder, that is, outside the machine. While maintaining the centered state of the eccentric work, the shaft of the eccentric work is gripped by the transfer hand of the eccentric work transfer device, and transferred to the eccentric clamp device of the chuck of the grinder. The eccentric work can be centered by placing and clamping it. Therefore, unlike the conventional method of centering an eccentric work performed on a chuck of a grinder, during the time period in which the eccentric work is centered, the original grinding operation by the grinder cannot be performed. Grinding of the eccentric portion of the eccentric work and centering of the eccentric portion of the next eccentric work can be performed in the same time period. Therefore, the productivity of machining the eccentric portion of the eccentric workpiece by the grinder is significantly improved, and the number of eccentric workpieces to be ground per unit time can be greatly increased.

According to the second aspect of the invention, the centering of the eccentric part eccentric with respect to the shaft part of the eccentric work and the spindle axis of the grinding machine, which is the center of processing, is performed by using a chuck other than the chuck of the grinding machine. An off-machine centering device for an eccentric workpiece in a grinder performed outside the machine,
A chuck whose axis is horizontally displaced from the axis of the spindle of the grinder by the amount of eccentricity of the eccentric part of the eccentric work and which is positioned absolutely or relatively opposite to the chuck of the grinder. a workpiece rotating device;
a workpiece receiver arranged on the front side of the chuck of the workpiece rotating device;
The eccentric part with respect to the eccentric work held by the work receiver is pushed into the chuck of the work rotating device, and the line segment connecting the axes of the eccentric work and the eccentric part becomes substantially horizontal. an eccentric portion placement position detection sensor for detecting that it is placed in a regular placement position, which is a specific one of the two placement positions of
With the eccentric portion arranged at the normal position, the eccentric work is rotated in a predetermined direction at a predetermined angle by the work rotating device according to a signal obtained by bringing a pair of contactors into contact with the upper and lower sides of the eccentric portion. a sizing device for positioning and centering the eccentric workpiece so that the line segment connecting the respective centers of the shaft portion and the eccentric portion becomes horizontal by rotating the eccentric portion by
The shaft of the eccentric workpiece centered by the sizing device is gripped by a pair of transfer hands, and the eccentric for transferring to the eccentric clamping device arranged in the chuck of the grinder. a work conveying device;
It is characterized by having

According to the invention of claim 2, the axis of the chuck of the workpiece rotating device is horizontally displaced from the axis of the spindle of the grinding machine by the amount of eccentricity of the eccentric part of the eccentric workpiece, and the workpiece receiver When the eccentric work held by is pushed into the chuck of the work rotating device and the eccentric work is rotated (rotated) by the work rotating device, the eccentric part arrangement position arranged opposite to the eccentric part of the eccentric work A normal arrangement position, which is a specific one of two arrangement positions of the eccentric portion with respect to the shaft portion, such that a line segment connecting the axial centers of the shaft portion and the eccentric portion of the eccentric work is substantially horizontal by a detection sensor. The rotation of the eccentric work is stopped at the position where it is detected that it is placed in the position. A line segment connecting the centers of the shaft portion and the eccentric portion is obtained by a signal obtained by bringing a pair of contactors of the sizing device into contact with the upper side and the lower side of the eccentric portion of the eccentric work arranged at the regular arrangement position. The eccentric portion of the eccentric work is centered by rotating the eccentric work by a predetermined angle in a predetermined direction by the work rotating device so that the eccentric portion of the eccentric work is horizontal. After that, after gripping the shaft portion of the centered eccentric work by a pair of transfer hands of the eccentric work transfer device, the gripping of the chuck of the work rotating device is released, and the eccentric work is extracted from the work rotating device. After lifting it vertically upward by a predetermined distance, the eccentric work is horizontally conveyed to just above the chuck of the grinder, and in this state, the eccentric work is lowered vertically downward and placed in the chuck of the grinder. When the eccentric work is transferred to the eccentric clamping device and clamped in this state, the eccentric work is clamped to the chuck of the grinder with the eccentric portion centered.

Immediately after the eccentric part of the immediately preceding eccentric work has been ground and the immediately preceding eccentric work is taken out from the eccentric clamping device arranged in the chuck of the grinder, the eccentric work already centered outside the machine is By transferring the workpiece to the eccentric clamping device of the chuck of the grinder, the eccentric part of the eccentric workpiece can be ground almost continuously by the same grinder, and the machining productivity of the grinder can be greatly improved.

According to the invention of claim 3, in the invention of claim 2, the transfer hand of the eccentric work transfer device is movable in a horizontal direction orthogonal to the axis of the spindle of the grinder, and has the same out-of-machine centering. A plurality of eccentric workpieces with different eccentric amounts can be set in the eccentric clamping device of the chuck of the grinder by using the device.

According to the third aspect of the present invention, the transfer hand of the eccentric workpiece transfer device is configured to be movable in the horizontal direction orthogonal to the spindle axis of the grinding machine, so that the chuck axis of the workpiece rotating device and the grinding are aligned. While maintaining the eccentricity (e) of standard eccentric workpieces, the amount of horizontal deviation from the spindle axis of the plate is measured from the chuck of the workpiece rotating device outside the machine by the transfer hand of the eccentric workpiece transfer device. After picking up an eccentric workpiece having a different amount of eccentricity (e′) that has already been centered, the transfer hand is moved in a predetermined horizontal direction by the absolute value of (e′−e), so that the grinding machine is For the chuck, the axis of the eccentric portion of the eccentric workpiece having the eccentricity (e') is made to coincide with the spindle axis of the grinding machine.

Therefore, the amount of horizontal misalignment between the axis of the chuck of the workpiece rotating device and the axis of the spindle of the grinder can be set to a plurality of types with different amounts of eccentricity while maintaining the amount of eccentricity (e) of the standard eccentric work. An eccentric workpiece can be set in the eccentric clamping device of the chuck of the grinding machine.

The invention of claim 4 is a chuck of a grinding machine for carrying out the invention of claim 1,
The eccentric clamping device includes a V block for supporting the shaft of an eccentric workpiece that has been centered outside the machine so that it is horizontally displaced from the axis of the spindle of the grinder by the amount of eccentricity, and the V block. a clamping member for clamping the shaft of the supported eccentric workpiece,
In the V-block portion, an interference avoidance missing space is provided to avoid interference with a transfer hand of an eccentric-work conveying device that grips the shaft portion of the eccentric work that has already been eccentric and is lowered from directly above the V-block portion. is provided at a central portion along the direction of the spindle axis,
The clamping member rotates about a fulcrum pin so as to clamp each portion of the shaft portion of the eccentric workpiece disposed on both sides of the interference avoidance missing space without interfering with the transfer hand. It is characterized in that it consists of a pair of pivoting clamps that move.

According to the fourth aspect of the invention, the centered eccentric workpiece gripped by the transfer hand of the eccentric workpiece conveying device is held in a state in which the pair of rotating clamping tools constituting the eccentric clamping device are retracted to the non-clamping position. When transferring to the V-block part that constitutes the eccentric clamping device, the transfer hand descends from directly above the chuck and enters the interference avoidance missing space provided in the V-block part, so that the V-block Without interfering with the block portion and the pair of rotating clamping tools at the retracted position, the shaft portion of the eccentric workpiece that has already been centered can be transferred to the V block portion while maintaining the centered state. In this state, the pair of rotating clamps rotate about the fulcrum pins, thereby holding the centered state and respectively clamping the shaft portions of the transferred eccentric workpiece on both sides of the transfer hands. After being clamped, the transfer hand is released from the grip of the shaft of the eccentric workpiece and retracted directly above.

According to the present invention, the eccentric portion of the eccentric work is centered outside the chuck of the grinder, the shaft portion of the centered eccentric work is gripped by the transfer hand of the conveying device, and the grinder is moved. By transferring to the eccentric clamping device arranged in the chuck, the eccentric part of the immediately preceding eccentric work is ground, and the immediately preceding eccentric work is taken out from the eccentric clamping device arranged in the chuck of the grinder. Immediately after the eccentric workpiece is centered outside the machine, the eccentric workpiece is transferred to the eccentric clamping device of the chuck of the grinding machine, so that both centering and grinding of different eccentric workpieces can be performed in the same time period. can do As a result, the eccentric portion of the eccentric workpiece can be substantially continuously ground by the same grinder, and the machining productivity by the grinder can be greatly improved.

FIG. 2 is a front view showing the positional relationship among an off-machine centering device K, a grinder G, and an eccentric work transfer device T according to the present invention; 4 is a plan view of the outboard centering device K. FIG. It is also a left side view. FIG. 4 is a schematic diagram showing a state in which the shaft portion A on the short side of the eccentric work W is chucked by chuck claws 8 of the chuck 1 of the work rotating device F; 3 is a schematic plan view showing the relationship between the axis _C11 of the chuck 1 of the work rotating device F and the spindle axis _C0 , which is the processing center of the grinding machine G. FIG. (a) is a side view of a state in which the shaft portion A of the eccentric work W gripped by the work rotation device F of the external centering device K is gripped by the transfer hand H of the eccentric work transfer device T; ) is a partially enlarged view of a pair of transfer hands H in (a). FIG. 4 is a side view of a state in which an elevating rod 28 of the eccentric work conveying device T is raised to take out the centered eccentric work W from the external centering device K and reach the upper end position. (a), (b) is a perspective view of each state of FIG. 5 and FIG. 6, respectively. A lift rod 28 having a pair of transfer hands H attached to its lower end is moved in a horizontal direction orthogonal to the spindle axis C ₀ of the grinder G in accordance with the change in the eccentricity (e) of the eccentric workpiece W. 2 is a front view of a loading hand moving device V; FIG. In (a), an eccentric workpiece W already centered by an external centering device K is transferred to an eccentric clamping device J arranged in a chuck 40 of a grinding machine G and clamped by a pair of clamping tools 42. FIG. 4B is a partially enlarged view of the V block portion 41 and the clamp portion 42 in FIG. FIG. 10 is a vertical cross-sectional view of the chuck 40 of the grinder G broken at the shaft portion A of the eccentric workpiece W clamped by the eccentric clamping device J in the same state. 2 is a perspective view of a state in which a centered eccentric workpiece W gripped by a pair of transfer hands H of an eccentric workpiece conveying device T is set on a V block portion 41 that constitutes an eccentric clamping device J of a grinding machine G. FIG. 4 is a perspective view of a state in which a shaft portion A of an eccentric workpiece W set on a V block portion 41 that constitutes the eccentric clamping device J is clamped by a pair of clamping tools 42. FIG. FIG. 11 is a perspective view of a state in which a pair of transfer hands H of the eccentric workpiece transfer device T is retracted upward, and the eccentric portion B of the eccentric workpiece W can be ground. A pair of transfer hands H of the lifting rods 28 holding an eccentric work W' having an eccentricity (e') different from the eccentricity (e) of the reference eccentric work W is moved by the transfer hand moving device V in the Y direction. It is a principle explanatory view that it can be set in the eccentric clamping device J of the grinder G by moving it to . FIG. 3 is a side view of a conventional centering device for an eccentric workpiece W and chuck 40' of a grinder D'. 2 is a front view of an eccentric workpiece W; FIG. 1 is a principle diagram of a conventional centering method for an eccentric workpiece W. FIG.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples.

First, the positional relationship between the grinder G and the outboard centering device K, and a plurality of devices constituting the outboard centering device K will be described with reference to FIGS. 1 to 3. FIG. According to the present invention, an eccentric work W is centered by a portion of the grinder G other than the chuck 40, that is, by an off-machine centering device K for the eccentric work W disposed outside the grinder G. The unloaded eccentric workpiece W is gripped by a pair of transfer hands H of the eccentric workpiece transfer device T while maintaining the centered state, and is held by the eccentric clamp device J disposed inside the chuck 40 of the grinder G. By transferring to the V-block portion 41 of the centering state, centering in the chuck 40 of the grinding machine G is unnecessary, and the operation rate of the grinding machine G is increased. . For this reason, an off-machine centering device K is arranged upstream of the grinding machine G along the horizontal transfer direction P of the eccentric work W already centered by the eccentric work transfer device T. While maintaining the centered state, the eccentric workpiece W is moved vertically upward by gripping the axial portion A of the centered eccentric workpiece W by a pair of transfer hands H of the eccentric workpiece transfer device T. Then, it is horizontally conveyed to just above the chuck 40 of the grinding machine G, and then lowered as it is, and the V block part 41 constituting the eccentric clamping device J installed in the chuck 40 of the grinding machine G is centered. The shaft portion A of the eccentric work W already completed is supported. Here, the horizontal transport direction P of the centered eccentric work W is the "X direction", and the shaft A is gripped by the chuck 1 of the work rotating device F, which is centered by the external centering device K, which will be described later. The direction of the line connecting the centers _C1 and _C2 of the axial portion A and the eccentric portion B of the eccentric workpiece W is called the "Y direction", and the vertical direction is called the "Z direction".

In order to realize the above motion, the off-machine centering device K grips one shaft portion A of the eccentric work W with the chuck 1 and moves the centers C of the shaft portion A and the eccentric portion B of the eccentric work W. A work rotating device F for rotating (turning) the eccentric work W so that the line segment connecting _{C1 and C2} is horizontal _, and a horizontal conveying direction of the eccentric work W in the chuck 1 of the work rotating device F. A workpiece receiver N arranged on the upstream side along P and an eccentric workpiece W held by the workpiece receiver N are pushed into the chuck 1 of the workpiece rotating device F to rotate the shaft portion A and the eccentric portion of the eccentric workpiece W. The eccentric workpiece is placed at a regular arrangement position, which is a specific one of the two arrangement positions of the eccentric part B with respect to the shaft part A, such that the line segment connecting the axes C ₁ and C ₂ of B is substantially horizontal. An eccentric portion arrangement position detection sensor S for detecting that W is arranged, and a pair of contactors 15a on the upper and lower sides of the eccentric portion B in a state where the eccentric portion B is arranged at the normal position. , 15b are brought into contact with each other to rotate the eccentric work W by a predetermined angle in a predetermined direction by the work rotating device F, so that the axial centers of the shaft portion A and the eccentric portion B of the eccentric work W are rotated. A sizing device D is provided for aligning the eccentric work W at a centering position such that the line segment _connecting C1 and _C2 is horizontal.

A first servomotor M1 is integrally attached to the work rotating device F via a support frame ₂ , and a timing gear 4 attached to a rotating shaft 3 of the first servomotor _M1 and the work rotating device F. A timing belt 7 is attached to a timing gear 6 attached to a rotating shaft 5 of the chuck 1 of F, and the chuck of the work rotating device F is rotated by a predetermined angle based on a command signal by the first servomotor _M1 . 1 is controlled and rotated. The chuck 1 for gripping the short shaft A of the eccentric work W has four chuck claws 8 as shown in FIG. By being gripped, the eccentric workpiece W is supported by the chuck 1 in a cantilevered state. In this way, the eccentric work W is cantilever supported by the chuck 1 of the work rotating device F, so that the short shaft portion A of the eccentric work W is gripped by the chuck 1 to be centered. The closer the eccentric portion B is to the chuck 1, the higher the accuracy of centering. Here, the arrangement position of the chuck 1 of the work rotating device F with respect to the chuck 40 of the grinding machine G is back to back, but the entire outboard centering device K can be placed horizontally on the eccentric work W with the arrangement as it is. When moved downstream along the movement direction, the respective chucks 1, 40 are absolutely arranged opposite each other. Therefore, the arrangement of the chucks 1 and 40 described above can be grasped as "relatively opposed arrangement".

Further, as shown in FIG. 5, the axis _C11 of the chuck 1 _of the workpiece rotating device F is offset by the amount of eccentricity (e ) of the eccentric workpiece W toward the non-regular arrangement position (the arrangement position opposite to the regular arrangement position of the eccentric portion B shown in FIG. 2). The axis _C11 of the chuck 1 of the workpiece rotating device F and the spindle axis _C0 , which is the processing axis of the grinding machine G, are shifted by the amount of eccentricity (e) of the eccentric workpiece W because This is because the eccentric work W is standard. For this reason, in order to center an eccentric work W' having another eccentricity amount (e'), the external centering device K is used as it is, and the eccentric work already centered by the eccentric work transfer device T is used as described later. In the course of transferring the work W' to the grinding machine G, the eccentric work W' is cut as shown in FIG. By moving in the direction of the line segment connecting the centers C ₁ ' and C ₂ ' of the shaft portion A' and the eccentric portion B', an eccentricity (e') different from that of the standard eccentric work W is secured. It is devised so that it can be set in the eccentric clamping device J of the grinder G. This makes it possible to grind not only the standard eccentric workpiece W but also the eccentric portions of various eccentric workpieces having different amounts of eccentricity with respect to the eccentric workpiece W. This configuration is also another feature of the present invention. It's becoming

As shown in FIGS. 2 and 3, a workpiece receiver N is arranged along the X direction so as to face the chuck 1 of the workpiece rotating device F. As shown in FIGS. The workpiece receiver N temporarily supports the center _C1 of the shaft portion A of the eccentric workpiece W before and after centering so that it is substantially aligned with the axis _C11 of the chuck 1 of the workpiece rotating device F. V-block portions 11 are provided at both ends along the X direction, and between the V-block portions 11 at both ends, there is interference for avoiding interference with a pair of transfer hands H gripping the eccentric workpiece W. An avoidance space 12 is formed. The eccentric work W, whose long side shaft A is supported by the work receiver N by the eccentric work supply means, is rotated by the rod 13a of the pushing cylinder 13 arranged concentrically with the supported eccentric work W by the work rotating device. F is pushed toward the chuck 1 side, and the shaft portion A on the short side of the eccentric work W is inserted into the chuck 1 and gripped by a plurality of chuck claws 8 . Here, when the shaft A on the short side of the eccentric work W is gripped by the plurality of chucks 1 of the work rotating device F, the shaft A on the long side of the eccentric work W is attached to each V block of the work receiver N. Since it is slightly separated from the receiving surface (V-shaped surface) of the portion 11, the centering of the eccentric workpiece W is accurately performed. After the centering, the shaft A on the long side of the eccentric workpiece W supported by the workpiece receiver N is gripped by a pair of transfer hands H, and the centered eccentric workpiece W is transferred to the workpiece rotating device F. By sliding in the X direction on the side away from the opposite side, the shaft portion A on the short side of the eccentric work W is taken out from the chuck 1 .

Further, the eccentric workpiece W whose short shaft portion A is gripped by the chuck 1 of the work rotating device F is placed on the right side of the shaft portion A when viewed from the end face side of the short shaft portion A. The state where B is arranged is the "regular arrangement position" of the eccentric workpiece W. The "regular arrangement position" of the eccentric work W is the center of the axial portion A of the eccentric work W that has been centered and supported by the V block portion 41 of the eccentric clamping device J when the chuck 40 of the grinder G is viewed from the front. It corresponds to the position of the spindle axis C ₀ of the grinder G on the right side of C ₁ .

The sizing device D has the same configuration as the sizing device D' of the conventional device, and as shown in FIGS. Contactors 15a and 15b are attached to the upper and lower surfaces of the eccentric portion B of W, respectively, so that the eccentric workpiece W is moved from the spindle axis C ₀ of the grinder G to the upper and lower surfaces of the eccentric portion B. and transmit the measurement information to the first servomotor _M1 of the work rotating device F to determine the center _C1 of the shaft portion A of the eccentric work W and the center _C2 of the eccentric portion B The eccentric portion B is centered by rotating the eccentric workpiece W in a predetermined direction by a predetermined angle until the line segment connecting the . The sizing device D as a whole advances and retreats with respect to the eccentric work W gripped by the chuck 1 of the work rotating device F by the advancing/retreating cylinder 16 . When the eccentric workpiece W is gripped, it is retracted as shown in FIG. 7, and after the eccentric workpiece W is gripped by the chuck 1, as shown in FIGS. The sizing device D moves forward, and the pair of contactors 15a and 15b attached to the tip portions of the pair of rotating arms 14a and 14b are moved to the upper and lower sides of the eccentric portion B of the eccentric work W. placed respectively. Further, when the pair of rotating arms 14a and 14b are at their retracted end positions, the air cylinders 10a and 10b arranged on the base end sides of the respective rotating arms 14a and 14b are turned "ON", thereby causing each contact. In a state in which the distance on the tip end side to which the elements 15a and 15b are attached is widened, the eccentric workpiece W supported by the chuck 1 of the workpiece rotating device F is advanced above and below the eccentric portion B, respectively. When the rotating arms 14a and 14b reach the forward end positions, the air cylinders 10a and 10b are turned "OFF", and springs (not shown) actuate the tip ends of the rotating arms 14a and 14b. The contacts 15a and 15b contact the upper and lower surfaces of the eccentric portion B of the eccentric workpiece W to enable centering.

Next, referring to FIGS. 1 and 6 to 9, the eccentric workpiece W, which has been centered by the external centering device K, is clamped to the chuck 1 of the workpiece rotating device F, and moved to the grinding machine G. The eccentric work transfer device T that transfers the work to the eccentric clamp device J will be briefly described. On the rear side of the grinder G and the off-machine centering device K, two pillars 21 are erected with a predetermined interval along the X direction, and a long rectangular traveling guide member is mounted on the upper surface of each pillar 21. 22 is horizontally supported, and a pair of guide rails 23 are provided on the front side surface of the travel guide member 22 at a predetermined interval in the Z direction (vertical direction). U reciprocates along the X direction. In the traveling unit U, a second servomotor _M2 for reciprocating the traveling unit U itself in the X direction is arranged on the unit frame 25 with its own drive shaft (not shown) vertical. The rotation is transmitted to a pinion (not shown) meshing with a long rack 24 provided on the upper surface of the travel guide member 22, and the travel unit U as a whole reciprocates in the X direction.

On the other hand, as shown in FIGS. 8 and 9, the unit frame 25 includes a movable plate 26 that moves in the Y direction in response to changes in the eccentricity (e) of the eccentric workpiece W. It is arranged at a predetermined interval in the X direction with respect to the fixed plate 27 . That is, the movable plate 26 is guided by a pair of linear guides 20 horizontally attached to a fixed plate 27 so as to move in the Y direction. A lifting rod 28 is guided by a lifting guide body 29 and supported on the movable plate 26 so as to be vertically held and liftable. and a pinion (not shown) driven and rotated by the third servomotor _M3 are meshed, and the lifting rod 28 is lifted and lowered by the driving rotation of the third servomotor _M3 . At the lower end of the lifting rod 28, an actuator (not shown) containing a pair of transfer hands H is arranged so as to be able to approach and separate from each other, gripping the shaft A on the long side of the eccentric workpiece W, and its opening is possible.

As shown in FIGS. 8 and 9, one end of a ball screw 32 is supported by a support plate 18 arranged perpendicularly to the fixed plate 27 so that the ball screw 32 extends along the Y direction. It is screwed with a ball nut 33 which is arranged and attached to the back surface of the movable plate 26 via a ball nut attachment member 19 . A fourth servo motor _M4 is arranged on the support plate 18 with a drive shaft 34 horizontal, and meshes with a gear 35 attached to the drive shaft 34 and a gear 36 attached to one end of the ball screw 32. ing. Therefore, in order to grind the eccentric portion B' of the eccentric workpiece W' having an eccentric amount (e') different from the eccentric amount (e) of the reference eccentric workpiece W, the eccentric amount (e') , the lifting rod 28 gripping the shaft A' of the eccentric work W' is moved in any direction along the Y direction by the pair of transfer hands H at the lower end so as to correspond to the grinding. With the eccentric work W' set in the eccentric clamping device J of the plate G, the center C ₂ ' of the eccentric portion B' coincides with the spindle axis C ₀ , so that the eccentric portion B' can be ground. Become. In this way, the eccentric portion of the eccentric workpiece can be centered by the external centering device K regardless of the amount of eccentricity of the eccentric workpiece. Adjusting the amount of eccentricity corresponding to the change in the amount of eccentricity of the reference eccentric work while gripping the eccentric work with a pair of transfer hands H at the lower ends of the lifting rods 28 constituting the traveling unit U of the eccentric work conveying device T. I do. In FIG. 8, reference numeral 37 denotes a cover that covers the gears 35 and 36. As shown in FIG.

As shown in FIGS. 10 to 14, the chuck 40 of the grinding machine G transfers and clamps the eccentric workpiece W centered by the external centering device K while maintaining the centered state. eccentric clamping device J is incorporated. The eccentric clamping device J includes a V block portion 41 for supporting the long side shaft portion A of the eccentric work W already centered, and the eccentric work W having the long side shaft portion A supported by the V block portion 41. and a pair of rotatable clamping tools 42 for clamping the shaft A with hydraulic force. Each rotatable clamp 42 is L-shaped, and its bent portion is rotatably supported by a chuck block 44 via a fulcrum pin 43 . The clamp portion 42a and the opposite end portion 42b of each rotary clamp 42 are connected to rods 47a of hydraulic cylinders 47 arranged in the chuck block 44 via connecting pins 48, respectively. The rod 47a moves in and out, and each of the rotating clamping devices 42 rotates around the fulcrum pin 43. As shown in FIG. The central portion of the V-block portion 41 along the X direction is used when the shaft portion A of the eccentric work W gripped by the pair of transfer hands H is arranged on the V-block portion 41 . In order to avoid interference with the pair of transfer hands H, an interference avoidance missing space 45 is formed. In this state, the eccentric portion B of the eccentric workpiece W protrudes forward from the front surface of the chuck 40 by a predetermined length, and can be ground by the rotary grindstone 46 . The V-shaped surface 41a of the V-block portion 41 and the clamping portion 42a of the rotary clamping member 42 are both made of cemented carbide chips having high abrasion resistance.

As described above, the shaft portion A on the short side of the eccentric work W is gripped by the chuck 1 of the work rotation device F of the external centering device K, and the eccentric work W is made rotatable by the work rotation device F. Then, the eccentric portion arrangement position detection sensor S confirms that the eccentric portion B of the eccentric work W is in the “normal arrangement position”, and the sizing device D detects the center C ₁ of the shaft portion A of the eccentric work W. and the center _C2 of the eccentric portion B is aligned horizontally.

After the eccentric workpiece W has been centered, as shown in FIG. 2, the third servomotor _M3 drives the lifting rod 28 standing by just above the eccentric workpiece W to lower the pair of lower ends thereof. The transfer hand H holds the shaft A on the long side of the eccentric work W already centered, and moves the traveling unit U in the X direction, thereby transferring the eccentric work W from the chuck 1 of the work rotating device F. Pull out the shaft A on the short side. After that _, the third servomotor _M3 is driven to raise the lifting rod 28 to the upper end. The traveling unit U is caused to travel in the X direction along the traveling guide member 22 until the centered eccentric work W gripped by H reaches just above the chuck 40 of the grinder G.

In the above state, the eccentric workpiece W gripped by the pair of transfer hands H at the lower end is moved up and down by driving the third servomotor _M3 until it reaches the V block portion 41 of the eccentric clamp device J of the grinder G. Lower the rod 28 (see FIG. 12). The pair of transfer hands H gripping the longer shaft A of the eccentric workpiece W enters the interference avoidance missing space 45 of the V block 41 that constitutes the eccentric clamping device J. The eccentric work W is supported by the V block portion 41 while the shaft portion A is gripped by the pair of transfer hands H without interfering with the pair of rotating clamps 42 at the retracted position. In this state, the pair of rotating clamps 42 constituting the eccentric clamping device J are rotated about the fulcrum pin 43 so that each rotating clamping tool 42 is supported by the V-block portion 41 by the clamp portion 42a at the tip thereof. When the axial portion A of the eccentric work W that is being held is clamped by hydraulic pressure at two points, the eccentric work W that has been pre-centered by the external centering device K is eccentrically clamped by the chuck 40 while maintaining the centered state. It is transferred to the V block section 41 that constitutes the device J (see FIG. 13). Next, after releasing the gripping of the long side shaft A of the eccentric workpiece W by the pair of transfer hands H, the lift rod 28 is lifted to raise the transfer hands H to the upper end, and the eccentric clamping device J A shaft portion A of the eccentric work W supported by the V block portion 41 of the chuck 40 is clamped by a pair of rotating clamping tools 42, and the eccentric portion B to be ground protrudes from the front end surface of the chuck 40 by a predetermined length. , it is ready for grinding by the rotary grindstone 46 (see FIG. 14). Since the eccentric portion B of the eccentric workpiece W clamped by the eccentric clamping device J is accurately centered by the external centering device K, it is ground by the rotary grindstone 46 with a minimum grinding allowance.

The eccentric workpiece W whose eccentric portion B has been ground is taken out from the eccentric clamping device J of the chuck 40 of the grinder G by a pair of transfer hands H at the lower ends of the lifting rods 28 constituting the travel unit U. The eccentric work W is placed on the work table R arranged downstream along the horizontal transport direction P. As shown in FIG.

Regarding the centering of the eccentric work W′ having the eccentricity (e′) different from the eccentricity (e) of the eccentric work W described above, it is as described above. The shaft A' of the eccentric workpiece W' is gripped and lifted by a pair of transfer hands H at the lower ends of the lifting rods 28 constituting the unit U, and then transferred to the eccentric clamp device J of the chuck 40 of the grinder G. In the meantime, the fourth servo motor _M4 constituting the transfer hand moving device V is activated to move the entire lifting rod 28 by a minute length corresponding to the absolute value of (e'-e). , Y direction. Therefore, there is an advantage that various eccentric workpieces W with different eccentricity (e) can be ground without changing the setting of complicated equipment.

Further, the arrangement position of the outboard centering device K with respect to the grinding machine G is not the arrangement in which the chuck 40 of the grinding machine G and the chuck 1 of the outboard centering device K are relatively opposed to each other as in the above embodiment. , both chucks 40 and 1 may be arranged to face each other absolutely. can be arranged in any way.

There is also an eccentric workpiece having two eccentric parts at positions that are 180° out of phase. A further off-board centering device and grinder may be provided for this purpose.

A: Shaft portion of eccentric work B: Eccentric portion of eccentric work C ₀ : Axis of spindle (processing center)
_C1 : Center of shaft of eccentric work _C2 : Center of eccentric part of eccentric work _C11 : Chuck axis of work rotating device D: Sizing device e: Eccentric amount of eccentric part of eccentric work F: Work rotation Equipment G: Grinding machine H: Transfer hand J: Eccentric clamping device K: Out-of-machine centering device _M1 to _M4 : Servo motor N: Workpiece receiver P: Horizontal transfer direction of eccentric work S: Eccentric part arrangement position detection sensor T: Eccentric work transfer device U: Traveling unit V: Transfer hand moving device W: Eccentric work X: Horizontal transfer direction of the centered eccentric work Y: Connecting the shaft of the centered eccentric work and each center of the eccentric part Line segment direction Z: Vertical direction 1: Chuck of workpiece rotating device 28: Elevating rod of traveling unit 40: Chuck of grinding machine 41: V block part of eccentric clamp device 42: Rotating clamp tool of eccentric clamp device (clamp member )
45: Interference avoidance missing space of V block part

Claims (4)

A grinder that performs centering to match the axis of the eccentric part that is eccentric with respect to the shaft part of the eccentric work and the spindle axis of the grinder that is the center of processing outside the chuck of the grinder. An off-machine centering method for an eccentric workpiece,
Outside the grinding machine, the eccentric part of the eccentric work is centered, and while maintaining the centered state of the eccentric work, the shaft part of the eccentric work is moved by the transfer hand of the eccentric work conveying device. An off-machine centering method for an eccentric workpiece in a grinder, characterized in that the eccentric workpiece is centered by gripping, conveying, transferring, and clamping to an eccentric clamping device of a chuck of the grinding machine. A grinder that performs centering to match the axis of the eccentric part that is eccentric with respect to the shaft part of the eccentric work and the spindle axis of the grinder that is the center of processing outside the chuck of the grinder. An off-machine centering device for an eccentric workpiece,
A chuck whose axis is horizontally displaced from the axis of the spindle of the grinder by the amount of eccentricity of the eccentric part of the eccentric work and which is positioned absolutely or relatively opposite to the chuck of the grinder. a workpiece rotating device;
a workpiece receiver arranged on the front side of the chuck of the workpiece rotating device;
The eccentric part with respect to the eccentric work held by the work receiver is pushed into the chuck of the work rotating device, and the line segment connecting the axes of the eccentric work and the eccentric part becomes substantially horizontal. an eccentric portion placement position detection sensor for detecting that it is placed in a regular placement position, which is a specific one of the two placement positions of
With the eccentric portion arranged at the normal position, the eccentric work is rotated in a predetermined direction at a predetermined angle by the work rotating device according to a signal obtained by bringing a pair of contactors into contact with the upper and lower sides of the eccentric portion. a sizing device for positioning and centering the eccentric workpiece so that the line segment connecting the respective centers of the shaft portion and the eccentric portion becomes horizontal by rotating the eccentric portion by
The shaft of the eccentric workpiece centered by the sizing device is gripped by a pair of transfer hands, and the eccentric for transferring to the eccentric clamping device arranged in the chuck of the grinder. a work conveying device;
An off-machine centering device for an eccentric workpiece in a grinder, comprising: The transfer hand of the eccentric work conveying device is movable in a horizontal direction orthogonal to the spindle axis of the grinding machine, and uses the same outboard centering device to transfer a plurality of eccentric works having different eccentric amounts. 3. An off-machine centering device for an eccentric workpiece in a grinder according to claim 2, characterized in that it can be set in an eccentric clamping device of a chuck of the grinder. A grinding machine chuck for carrying out the invention according to claim 1,
The eccentric clamping device includes a V block for supporting the shaft of an eccentric workpiece that has been centered outside the machine so that it is horizontally displaced from the axis of the spindle of the grinder by the amount of eccentricity, and the V block. a clamping member for clamping the shaft of the supported eccentric workpiece,
In the V-block portion, an interference avoidance missing space is provided to avoid interference with a transfer hand of an eccentric-work conveying device that grips the shaft portion of the eccentric work that has already been eccentric and is lowered from directly above the V-block portion. is provided at a central portion along the direction of the spindle axis,
The clamping member rotates about a fulcrum pin so as to clamp each portion of the shaft portion of the eccentric workpiece disposed on both sides of the interference avoidance missing space without interfering with the transfer hand. A grinder chuck comprising a pair of rotating clamps that move.

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