JP2010173005A - High-speed automatic centering method of eccentric part of eccentric workpiece, and apparatus for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out centering at high speed to allow the processing center of a grinder and the center of an eccentric part to coincide with each other in an eccentric workpiece having one eccentric part. <P>SOLUTION: The position of the center C<SB>2</SB>of the eccentric part B is measured by a measurement device D using a workpiece rotating device F in which a clamp tool 18 for holding the axial part A of the eccentric workpiece W<SB>1</SB>is rotated by a servo motor M with an encoder. The rotating angle θ of the axial part A required to make the center C<SB>2</SB>of the eccentric part B coincide with a processing center C<SB>0</SB>is calculated. The servo motor M constituting the workpiece rotating device F rotates the axial part A of the eccentric workpiece W<SB>1</SB>at one time by only the rotating angle θ calculated by the encoder so that the centering is carried out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the case of an eccentric work having one eccentric part, the present invention performs centering in a short time so that the processing center of the grinding machine (the axis of the spindle shaft) and the center of the eccentric part coincide with each other. In the case of an eccentric work having two eccentric parts, the machining center of each eccentric part can be centered at high speed so that the grinding allowance along the circumferential direction of the two eccentric parts is the same. The present invention relates to a high-speed automatic centering method for an eccentric part of an eccentric work that can be performed (indexed) and an apparatus therefor.

  When a workpiece is ground by grinding the workpiece, for workpieces with an eccentric part, the center of the spindle, which is the machining center, and the center of the eccentric part of the workpiece are misaligned with the workpiece set on the grinding machine. In this case, the amount of grinding is unnecessarily increased and intermittent grinding occurs in the initial stage of grinding. Therefore, centering is performed so that the axis of the spindle coincides with the center of the eccentric part of the workpiece. As a centering method, the one described in Patent Document 1 is known.

However, as shown in FIG. 15, in the eccentric work W _{1 having one} eccentric portion B, in order to make the center C ₂ of the eccentric portion B coincide with the processing center C _{0 of the} grinding machine, In the state where the shaft portion A of the eccentric work W ₁ is supported by the V block portion 4 constituting the eccentric clamp device J of the grinding machine, and the upper side of the shaft portion A is temporarily fixed by the clamp tool, the measuring device D A pair of upper and lower measuring elements 1a, 1b constituting the upper and lower sides of the eccentric part B are applied, and the upper and lower measuring elements 1a, 1b are applied to the master work W ₁₀ (see FIG. 3). Compared with the reference data, by reading the position of the center C ₂ of the eccentric portion B, the shaft portion A is rotated in the predetermined direction in order to make the center C ₂ of the eccentric portion B coincide with the processing center C _0. It is rotated by θ ₁₀ .

_On the axis of the shaft part A of the eccentric work W ₁ , except for the servo motor M with an encoder, a conventional work rotation having substantially the same configuration as the work rotation device F according to the present invention shown in FIG. The clamp tool 18 constituting the apparatus is arranged so as to be able to advance and retreat, and the motor constituting the work rotating apparatus F is held in a state where the shaft part A of the eccentric work W ₁ is gripped by the pair of clamp claws 17 of the clamp tool 18 ( The clamp 18 is rotated by an unillustrated), and the entire eccentric part B is rotated about the center C ₁ of the shaft part A, and the center C ₂ of the eccentric part B is set as the machining center C of the grinding machine. Match ₀ . Note that the center C ₁ of the shaft portion A is disposed in advance at a position where the line segment connecting to the processing center C ₀ is horizontal.

Conventionally, when rotating the shaft portion A, a plurality of intermediate signal points from the rotation start position to the rotation stop position where the center C ₂ of the eccentric portion B coincides with the machining center C _{0 of the} grinding machine. The center C ₂ of the eccentric portion B is determined by detecting that the pair of measuring elements 1a and 1b has reached one of the intermediate signal points and switching the rotational speed of the motor to decrease the speed sequentially. Control was made so that it would easily coincide with the processing center C ₀ . This is because if the shaft A is turned to the rotation stop position with the initial speed from the rotation start position, the time required for the rotation is shortened, but the center C ₂ of the eccentric part B is the rotation stop position. _In order to increase the stopping accuracy, in order to increase the stopping accuracy, the stopping speed of the eccentric portion B is increased by sequentially decreasing the motor speed at each intermediate signal point. The matching accuracy between the center C _{2 of the} part B and the processing center C ₀ was increased. However, when the stopping accuracy of the eccentric portion B is increased in this way, the time from the start of rotation of the shaft portion A or the eccentric portion B to the stop becomes longer, and it is not directly related to grinding. setting time of the eccentric portion B becomes longer, and thus the working efficiency of the eccentric portion B of the eccentric workpiece W ₁ (the number of processable eccentric workpiece W ₁ in a unit time) is lowered.

In FIG. 15, for the sake of simplicity, there is one intermediate signal point, and the rotational speed of the shaft portion A (motor rotational speed) is in two stages. In the alignment, there are three or more stages in order to increase the stopping accuracy of the eccentric part B, and this has caused the centering time of the eccentric part B to be longer. In FIG. 15, the rotation speed of the shaft portion A is set faster between the rotation angle θ ₁₁ between the solid line and the alternate long and short dash line than between the rotation angle θ ₁₂ indicated by the alternate long and short dash line. is there. Incidentally, at the time of processing of the eccentric part B, eccentric clamping device J is around the processing center C ₀ rotate (revolve).

On the other hand, FIG. 16, to match the center C ₂₁ of the eccentric portion B ₁ in the processing center C _0, the eccentric portion B ₁ After grinding the outer periphery around the have processing center C _0, around the shaft portion A As shown in the figure, the eccentric workpiece W ₂ having two eccentric portions B ₁ and B ₂ is shown in a state where the other eccentric portion B ₂ is rotated by 180 ° and the other eccentric portion B ₂ is externally ground. each eccentric unit B _1, if the phase shift of the center C _21, C ₂₂ of B ₂ is large, do not select the processing center of the eccentric portion B _1, B ₂ well, the two eccentric portions B ₁ and B ₂ , because the grinding allowance along the circumferential direction is different, one eccentric part B ₁ can be ground over the entire circumference and the entire outer skin can be removed. The eccentric portion B ₂ has a problem that the unground portion 31 is generated in a part of the circumferential direction, and a black skin remains as it is in a part of the outer periphery, resulting in a processing failure. In FIG. 16, C ₂₂ ′ indicates the center of each eccentric portion B ₂ after outer periphery grinding.

Japanese Patent Laid-Open No. 5-245541

  A first object of the present invention is to perform high-speed centering that aligns the machining center of the grinding machine (spindle shaft axis) and the center of the eccentric part in an eccentric work having one eccentric part. The second problem is that, in an eccentric work having two eccentric parts, the grinding allowance along the circumferential direction is the same in order to eliminate the occurrence of unground parts of the two eccentric parts. In this way, the processing center of each eccentric part is determined to enable processing.

  In order to solve the above-mentioned problem, the invention according to claim 1 is capable of gripping the shaft portion of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece with respect to the axis of the spindle shaft which is the processing center. An eccentric clamp device, and a shaft portion gripped by the eccentric clamp device, which is disposed so as to be able to advance and retreat, and for gripping the free end portion of the shaft portion and rotating the eccentric workpiece Using a centering device provided with a workpiece rotating device and a measuring device for measuring the center position of the eccentric portion by contacting a pair of measuring elements on the upper side and the lower side of the eccentric portion of the eccentric workpiece, A method of automatically centering an eccentric part that is eccentric with respect to a shaft part of an eccentric work, wherein the work rotating device has an encoder provided with a clamp for gripping the shaft part of the eccentric work The center of the eccentric portion is rotated by the measuring device. The rotation angle of the shaft portion necessary for measuring the position of the eccentric portion to coincide with the center of machining is calculated, and the servo motor that constitutes the workpiece rotating device determines the rotation angle determined by the encoder. However, it is characterized by centering by rotating the shaft part of the eccentric work at once.

  According to the invention of claim 1, the center of the eccentric portion is obtained by comparing the pair of measuring elements of the measuring device with the upper side and the lower side of the eccentric portion and comparing with the reference data obtained by the master work. The position can be measured. By determining the center position of the eccentric part, the rotation angle of the shaft part necessary to make the center of the eccentric part coincide with the machining center is calculated, and the servo motor is operated by one rotation operation according to the command of the encoder. Since the shaft part of the eccentric work is rotated by the rotation angle and stopped accurately, the center of the eccentric part of the eccentric work can be aligned with the machining center with high accuracy and at high speed. As a result, the preparation time for grinding the eccentric portion of the eccentric workpiece is reduced, and the processing efficiency is increased.

  The invention of claim 2 includes an eccentric clamp device capable of gripping the shaft portion of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece with respect to the axis of the spindle shaft which is the processing center, A workpiece rotating device arranged to be movable back and forth on the same axis as the shaft gripped by the eccentric clamp device, for gripping the free end of the shaft and rotating the eccentric workpiece, and the eccentric The center position of each eccentric part is measured by bringing a pair of measuring elements into contact with the upper and lower positions of the first and second eccentric parts provided with a phase difference of about 180 ° on the workpiece. By using a centering device provided with each of the first and second measuring devices to automatically center the two eccentric portions that are eccentric with respect to the shaft portion of the eccentric workpiece. And measuring the positions of the centers of the first and second eccentric portions by the first and second measuring devices, The angle formed by each line segment connecting the center of the part and the center of each eccentric part and the horizontal line is calculated, and the work part rotation device is used to make the shaft part a necessary angle so that the angles are equal. After rotating and grinding the first or second eccentric part arranged on the processing center side in the above state, the shaft part is rotated by 180 ° and the other eccentric part is circumferentially ground. It is characterized by doing.

  According to the invention of claim 2, since the two eccentric parts of the eccentric work can be ground in the same state, that is, with the same grinding allowance along the circumferential direction of the eccentric part, The angle formed by the two line segments connecting the center and the center of the shaft part is greatly deviated with respect to 180 °, that is, the phase difference between the two eccentric parts is greatly deviated with respect to 180 °. In the case of grinding, it is possible to prevent a grinding failure in which an unground portion remains on one of the outer peripheral surfaces, that is, a black skin of the workpiece remains.

  A third aspect of the present invention is characterized in that, in the second aspect of the invention, the workpiece rotating device is configured such that a clamp tool for gripping the shaft portion of the eccentric workpiece is rotated by a servo motor with an encoder.

  According to the invention of claim 3, when the shaft part of the eccentric workpiece is gripped by the clamp of the workpiece rotating device and the eccentric workpiece is accurately rotated by the calculated angle, the rotation can be performed in a short time.

  In order to carry out the invention of claim 1, the invention of claim 4 is an apparatus for automatically centering to make the center of the eccentric part of the eccentric work coincide with the processing center of the grinding machine. An eccentric clamp device capable of gripping the shaft portion of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece relative to the center axis of the spindle shaft, and an axis gripped by the eccentric clamp device A workpiece rotating device that is disposed so as to be capable of advancing and retreating on the same axis as the part, and that grips the free end of the axis and rotates the eccentric work, and a pair of upper and lower sides of the eccentric part And a measuring device for measuring the center position of the eccentric part by contacting the measuring element, and the work rotating device is configured such that a clamp for gripping the shaft part of the eccentric work is rotated by a servo motor with an encoder. It is characterized by being.

  According to invention of Claim 4, the centering method of the eccentric work of Claim 1 can be implemented exactly.

  In order to implement the invention of claim 2, the invention of claim 5 is an apparatus for automatically centering the two eccentric portions of the eccentric work, and is provided on the axis of the spindle shaft which is the processing center. On the other hand, an eccentric clamp device capable of gripping the shaft portion of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric fine groove, and the shaft portion gripped by the eccentric clamp device on the same axis A workpiece rotating device that is arranged so as to be able to advance and retreat, and that grips the free end of the shaft portion to rotate the eccentric workpiece; A first measuring device and a second measuring device for measuring the center position of each eccentric portion by bringing a pair of measuring elements into contact with each of the upper and lower positions of each second eccentric portion; The center positions of the first and second eccentric parts are measured by the first and second measuring devices, and the center of the shaft part and each Each angle formed by each line segment connecting the center of the core and the horizontal line is calculated, and the shaft is rotated by a necessary angle by the work rotating device so that the angles are equal to each other. It is characterized by determining the processing center of the core.

  According to the invention of claim 5, the eccentric work centering method of claim 2 can be carried out accurately.

  According to the invention of claim 1, the data obtained by bringing the pair of measuring elements of the measuring device into contact with the upper side and the lower side of the eccentric part of the eccentric work are similar to the data when using the master work. By comparing, the center position of the eccentric part is found, and the rotation angle of the shaft part necessary to make the center of the eccentric part coincide with the machining center is calculated. The workpiece rotating device provided in the grinding machine is driven by a servo motor with an encoder, and rotates the shaft part of the eccentric workpiece by the rotation angle according to the command of the encoder by only one rotation operation. Since it can be stopped accurately, the centering of the eccentric part of the eccentric workpiece can be aligned with the machining center with high accuracy and at high speed. As a result, the preparation time for grinding the eccentric part of the eccentric workpiece is reduced, and the processing efficiency is increased.

  According to a second aspect of the present invention, the first and second measuring devices are used to center the first and second eccentric portions provided on the eccentric workpiece. The position of the center of each eccentric part is measured, and each angle formed by each line segment connecting the center of the shaft part and the center of each eccentric part and the horizontal line is calculated, and each angle becomes equal. As described above, after rotating the shaft portion by a necessary angle by the work rotating device and grinding the outer periphery of either the first or second eccentric portion arranged on the machining center side in the above state, the shaft This is a configuration in which the other eccentric part is ground by rotating the part by 180 °. Therefore, since the two eccentric parts of the eccentric work can be ground in the same state, that is, with the same grinding allowance along the circumferential direction of the eccentric part, the center of each eccentric part and the center of the shaft part can be set. If the angle formed by the two line segments to be connected is greatly deviated from 180 °, that is, the phase difference between the two eccentric parts is greatly deviated from 180 °, It is possible to prevent a grinding failure in which an unground portion remains on one of the outer peripheral surfaces, that is, a black skin of the workpiece remains.

It is a front view of a centering device K ₁ of the eccentric workpiece W _1. It is a front view of the eccentric work W _1. It illustrates the principle of a centering of the master work W _10. It illustrates the principle of a centering of the eccentric work W _1. It is a block diagram of a sequence control for the centering of the eccentric workpiece W _1. It is a front view of the eccentric work W _2. Using the first and second measuring devices D ₁ and D ₂ , the positions of the centers C ₂₁ and C ₂₂ of the first and _second eccentric parts B ₁ and B ₂ of the eccentric work W ₂ are detected. It is a figure which shows the state to do. Each line that rotates the shaft portion A of the eccentric workpiece W _2, connecting the center C _21, C ₂₂ and processing center C ₀ of the eccentric workpiece W each eccentric portion B ₁ of the first and second 2 _2, B ₂ It is a figure which shows the state centered so that the angle which a minute and a horizontal line make may become equal. The first eccentric portion B ₁ is a diagram showing a state of being periphery grinding. It is a diagram showing a state where the second eccentric portion B ₂ is centered by rotating the first eccentric portion B ₁ by 180 ° around the shaft portion A of the eccentric workpiece W ₂ whose outer periphery is ground. The second eccentric portion B ₂ is a diagram showing a state in which it is grinding the outer periphery. The phase difference between the first and second respective eccentric portions B _1, B ₂ is a diagram showing a state of being grinding the outer periphery so that 180 °. The centers C ₂₁ and C ₂₂ of the first and second eccentric parts B ₁ and B ₂ of the eccentric work W ₁ ′ are set on different sides with respect to the horizontal line passing through the center C ₁ of the shaft part A. This is an example. In the eccentric workpiece W ₁ ″ in which the phases of the centers C ₂₁ and C ₂₂ of the first and second eccentric portions B ₁ and B ₂ are 180 °, the centers C ₂₁ and C ₂₂ are the centers C of the shaft portion A. It is an example set on a different side with respect to a horizontal line passing through ₁ . It is an explanatory view of a conventional centering method of the eccentric workpiece W ₁ having one of the eccentric portions B. In eccentric workpiece W ₂ having two eccentric portions B _1, B _2, it is a diagram showing that unground portion is generated in one of the eccentric portion.

  Hereinafter, the inventions of claims 1 to 5 will be described in more detail with reference to examples.

First, with reference to FIGS. 1 to 5, embodiments of the inventions of claims 1 and 4 will be described. Figure 1 is a front view of the centering device K ₁ of the eccentric workpiece W _1, Fig. 2 is a front view of the eccentric workpiece W _1, Fig. 3, principle diagram of the centering of the master work W ₁₀ 4 is a principle diagram of the centering of the eccentric work W ₁ , and FIG. 5 is a block diagram of sequence control for centering the eccentric work W ₁ . As shown in FIGS. 2 and 3, the eccentric workpiece W ₁ has a shape in which one eccentric portion B is provided with respect to the shaft portion A, and the center C ₁ of the shaft portion A and the eccentric portion. The eccentric amount of the center C ₂ of B is (e), and the eccentric part B of the eccentric work W ₁ is centered by the centering device K ₁ attached to the grinding machine G. Peripheral grinding of the core B is performed.

As shown in FIGS. 1 and 3, the centering device K ₁ includes a measuring device D for measuring (detecting) the position of the center C ₂ of the eccentric portion B of the eccentric workpiece W ₁ , and the measuring device. The eccentric workpiece W is arranged so that the center C ₂ of the eccentric part B measured by D is arranged on a horizontal line passing through the machining center (same as the position of the axis of the spindle shaft 11 of the grinding machine G) C _0. It is comprised with the workpiece | work rotation apparatus F for rotating the axial part A of _1. FIG. The measuring device D is disposed in a plane orthogonal to the axis C ₀ of the spindle shaft 11 of the grinding machine G, and is mounted facing the inside of each arm 2a, 2b that performs an arc motion around a fulcrum. a pair of the probe 1a, includes a 1b, above and below the eccentric part B of the eccentric workpiece W _1, which is gripped shank a with eccentric clamping device J grinder G, and measurement of the pair The position of the center C ₂ of the eccentric part B is measured (detected) by data obtained by bringing the elements 1a and 1b into contact with each other. Specifically, as shown in FIG. 3, the horizontal line L ₀ and the measuring element 1a through the processing center C _0, by measuring the distance a _1, a ₂ between 1b, the center of the eccentric portion B to detect the C _2. As shown in FIG. 3, if (a ₁ = a ₂ ), the center C ₂ of the eccentric portion B coincides with the processing center C ₀ , and if a ₁ and a ₂ are not equal, The center C ₂ of the core B is unevenly distributed on the larger value side, and the uneven distribution amount can be understood. Since the pair of arms 2a and 2b of the measuring device D according to the embodiment performs an arc motion around the fulcrum, the measuring elements 1a and 1b provided to face the distal ends of the arms 2a and 2b are arcs. Although it is the structure which moves above, there exists a thing of the structure where each measuring element 1a, 1b moves up and down.

A face plate 12 that rotates integrally with the spindle shaft 11 is attached to the tip of the spindle shaft 11 of the grinding machine G, and the shaft A of the eccentric workpiece W ₁ is held inside the face plate 12. An eccentric clamp device J is provided. The spindle shaft 11 is rotatably supported by the casing 10 via a bearing 9. The eccentric clamp device J includes a V block portion 4 that supports the shaft portion A of the eccentric workpiece W ₁ with the V surface 3, and a clamp cylinder 5 that presses the shaft portion A supported by the V block portion 4 from above. Consists of. Since the eccentric clamp device J of the embodiment includes a pair of clamp cylinders 5 so that the shaft portion A can be pressed at different portions along the axial direction, the shaft portion A of the eccentric work W ₁ can be stabilized. Can be supported. In FIG. 3, reference numeral 5a denotes a rod of the clamp cylinder 5.

On the extended line of the shaft portion A of the eccentric work W ₁ supported by the eccentric clamp device J, a work rotating device F for gripping and rotating the shaft portion A is disposed. In the work rotation device F, a guide rail 13 is disposed along the axial direction of the spindle shaft 11, and a support body 14 that supports a servo motor M with an encoder is fitted into the guide rail 13. Thus, the servo motor M advances and retreats in the axial direction of the spindle shaft 11 by the action of the cylinder 15 for advancing and retracting the clamp tool. A clamp tool 18 including a pair of clamp claws 17 that can be expanded is attached to the rotating shaft 16 of the servo motor M. The axis of the rotating shaft 16 of the servo motor M coincides with the center (axial center) C ₁ of the shaft portion A of the eccentric workpiece W ₁ clamped by the eccentric clamping device J. The servo motor M rotates in the command direction by the command angle in a state where the clamp tool 18 moves forward to the position indicated by the chain line and the outer periphery of the shaft portion A of the eccentric workpiece W ₁ is clamped by the pair of clamp claws 17. Thus, the eccentric work W ₁ temporarily fixed by the eccentric clamp device J is rotated in the command direction by the command angle, and the eccentric part B of the eccentric work W ₁ is centered.

Next, with reference to FIG. 1, FIG. 4 and FIG. 5, the centering of the eccentric part B of the eccentric workpiece W ₁ by the above-described centering device K ₁ will be described. As shown in FIG. 4, the shaft portion A of the eccentric work W ₁ is supported by the V block portion 4 of the eccentric clamp device J, and the upper side of the shaft portion A is lightly pressed by the rod 5 a of the clamp cylinder 5. The pair of upper and lower measuring elements 1a, 1b of the measuring device D are applied to the upper side and the lower side of the eccentric part B, and the difference b ₁ , b ₂ from the measuring position of the master work W ₁₀ is respectively obtained. calculate. As a result, when the amount of vertical displacement between the center C ₂ of the eccentric portion B and the processing center C ₀ is (d), the relationship [d = (b ₁ + b ₂ ) / 2] is established. Then, in order to make the center C ₂ of the eccentric part B coincide with the machining center C ₀ , assuming that the phase rotation angle that is the angle of rotating the shaft part A of the eccentric work W ₁ is (θ), (sin θ = d / E) is established, and the phase rotation angle θ is calculated by the calculation device T.

Next, the rod of the cylinder 15 for advancing / retracting the clamp tool of the work rotating device F protrudes, the clamp tool 18 moves forward, and the shaft portion A of the eccentric work W ₁ is clamped by the pair of clamp claws 17. Data relating to the phase rotation angle θ calculated by the arithmetic unit T is input to the encoder of the servo motor M, and a rotation command signal corresponding to the phase rotation angle θ is issued from the encoder to the servo motor M, so that the eccentric workpiece The shaft portion A of W ₁ is rotated in the command direction by the phase rotation angle θ by one continuous rotation, and is accurately rotated by the set phase rotation angle θ and stopped. For this reason, centering, which is an operation for making the center C ₂ of the eccentric portion B of the eccentric workpiece W ₁ coincide with the machining center C ₀ , can be performed with high accuracy and at high speed. Incidentally, after the centering, (see FIG. 1) rotating grinding wheel 19 is pressed against the direction perpendicular to the axis of the eccentric workpiece W ₁ on the outer circumference of the eccentric portion B, it is ground by the required amount.

Next, with reference to FIGS. 6 to 12, embodiments of the inventions of claims 2, 3, and 5 will be described. FIG. 6 is a front view of the eccentric work W ₂ , and FIG. 7 shows the first and second of the eccentric work W ₂ using the first and second measuring devices D ₁ and D _2. FIG. 8 is a diagram showing a state in which the positions of the centers C ₂₁ and C ₂₂ of the eccentric parts B ₁ and B ₂ are detected. FIG. 8 shows the eccentric work W ₂ by rotating the shaft part A of the eccentric work W _2. The first and second eccentric parts B ₁ and B ₂ are centered so that the angle formed between the line segment connecting the centers C ₂₁ and C _{22 of the} eccentric centers B ₁ and B ₂ and the processing center C ₀ and the horizontal line is equal. FIG. 9 is a view showing a state in which the first eccentric portion B ₁ is subjected to outer peripheral grinding, and FIG. 10 is an axis of the eccentric workpiece W ₂ in which the first eccentric portion B ₁ is subjected to outer peripheral grinding. FIG. 11 is a diagram showing a state in which the second eccentric portion B ₂ is centered by being rotated 180 ° around the portion A, and FIG. 11 is a diagram showing a state in which the second eccentric portion B ₂ is peripherally ground. FIG. 12 shows the first and second Phase difference of the eccentric portion B _1, B ₂ is a diagram showing a state of being grinding the outer periphery so that 180 °.

As shown in FIGS. 6 and 7, the eccentric work W ₂ has first and second eccentric portions B ₁ and B _{2 that} are different in phase by approximately 180 ° at different positions in the axial direction of the shaft portion A. However, the phase difference between the first and second eccentric portions B ₁ and B ₂ is not exactly 180 °. That is, the line segment L ₁ connecting the center C ₁ of the shaft portion A and the center C ₂₁ of the first eccentric portion B _1, the center C ₁ and the second center C ₂₂ of the eccentric portion B ₂ of the shaft portion A The angle formed by the line segment L ₂ connecting the _two is (180 ° −θ ₁ −θ ₂ ). However, θ ₁ and θ ₂ are the line segments L ₁ , L in the state where the shaft portion A of the eccentric work W ₂ is supported by the V block portion 4 of the eccentric clamp device J, as shown in FIG. _The acute angle between ₂ and the horizontal line is shown. The lengths of the line segments L ₁ and L ₂ are equal to the eccentric amount (e) between the first and second eccentric portions B ₁ and B ₂ and the shaft portion A.

Centering device K ₂ of each eccentric portion B _1, B ₂ of the eccentric workpiece W ₂ includes a first measuring apparatuses D ₁ to the position of the first eccentric portion B ₁ of the center C ₂₁ to measure (detect), The second measuring device D ₂ that measures (detects) the position of the center C ₂₂ of the second eccentric portion B ₂ and the workpiece rotating device F are configured. The first and second measuring devices D ₁ and D ₂ have the same configuration as the measuring device D, and are arranged at different positions along the axial direction of the spindle shaft 11 of the grinding machine G.

The center of one eccentric part of the master work W ₂₀ in which the phase difference between the two eccentric parts is exactly 180 ° before the eccentric parts B ₁ and B ₂ of the eccentric work W ₂ are centered. Is aligned with the processing center C _0, and the master work W ₂₀ is set on the V block portion 4 of the eccentric clamp device J and temporarily fixed, with the first on the upper and lower sides of each eccentric portion. and the second of each measuring device D _1, D ₂ of the pair of upper and lower gauge head 1a, against the 1b, and stores the reference position (reference data) in each measuring device D _1, D _2. Next, as shown in FIG. 7, in the state where the eccentric work W ₂ is set and temporarily fixed to the V block portion 4 of the eccentric clamp device J, the first and second eccentric portions B ₁ , above and below the B _2, each of the first and second measuring devices D _1, D ₂ of the pair of upper and lower gauge head 1a, against the 1b, the eccentric portion B _1, B ₂ of the center C _21, The position of C ₂₂ is detected. Thereby, the angles θ ₁ and θ ₂ formed by the line segments L ₁ and L ₂ and the horizontal line are measured. In the embodiment, the relationship is (θ ₁ > θ ₂ ). As described above, when the phase difference between the first and second eccentric portions B ₁ and B ₂ is greatly deviated with respect to 180 °, the shaft is formed after the first eccentric portion B ₁ is processed on the outer periphery. When the part A is rotated 180 ° and the second eccentric part B ₂ is peripherally processed, a part of the outer peripheral surface of any eccentric part B ₁ (B ₂ ) remains without being ground. (A portion indicated by 31 in FIG. 14) may occur. Therefore, in the invention of claim 2, the first and second eccentric portions B ₁ and B ₂ are in the same state, that is, the grinding allowance along the circumferential direction of each eccentric portion B ₁ and B ₂ is the same. By grinding in this manner, it is possible to eliminate the occurrence of the unground portion described above.

Specifically, if the center of one eccentric part is aligned with the machining center and the outer periphery is ground, an unground part tends to occur in the other eccentric part, or the circumferential grinding allowance changes greatly. Therefore, the eccentric parts B ₁ and B ₂ are centered so that the deviations from the processing center C ₀ to the centers C ₂₁ and C ₂₂ of the eccentric parts B ₁ and B ₂ are the same. Grind in the same state. In the invention of claim 2, also will be referred to as "centering" to define the position of the eccentric portion with respect to the processing center C ₀ as described above. That is, since there is a difference in the angles θ ₁ and θ ₂ (θ ₁ > θ ₂ ) formed by the line segments L ₁ and L ₂ and the horizontal line, as shown in FIG. 8 and FIG. In order to make the angles formed by L ₁ , L ₂ and the horizontal line equal, the angle θ ₁ is reduced by [(θ ₁ −θ ₂ ) / 2] around the shaft part A by the eccentric work W _2. The angle formed by the line segments L ₁ and L ₂ and the horizontal line is all [(θ ₁ + θ ₂ ) / 2], and in this state, the first eccentric portion B ₁ Peripheral grinding is performed (see FIG. 9). Here, to make the angles formed by the line segments L ₁ and L ₂ and the horizontal line equal, from another viewpoint, the positions in the height direction on the upper side and the lower side of the two eccentric parts are made equal. This means that the two eccentric portions are arranged symmetrically with respect to a vertical line passing through the center of the shaft portion. In FIGS. 9 to 12, B ₁ ′ and B ₂ ′ indicate the first and second eccentric portions after outer periphery grinding, respectively, and C ₂₁ ′ and C ₂₂ ′ indicate after outer periphery grinding. each eccentric portions of the first and ₂ B ₁ ', B 2' indicates the center of.

Next, in exactly the same manner as when rotating the eccentric workpiece W ₁ , the free end portion of the eccentric workpiece W ₂ is clamped by the pair of clamp claws 17 of the workpiece rotating device F, and the shaft portion A is centered. When the eccentric work W ₂ is rotated 180 °, the center C ₂₁ ′ of the processed first eccentric part B ₁ ′ is on the extension line of the line connecting the processing center C ₀ and the center C ₁ of the shaft part A. Be placed. When the means for rotating the clamp tool 18 of the workpiece rotating device F is a servo motor M with an encoder as in the embodiment, the eccentric workpiece W ₂ can be accurately rotated 180 °, so that the processed first It is necessary to confirm by the first measuring device D ₁ that the center C ₂₁ ′ of the eccentric part B ₁ ′ is arranged on the extension line of the line connecting the processing center C ₀ and the center C ₁ of the shaft part A. no, but if the rotation means of the clamp member 18, such as a common motor is preferably by first measuring apparatuses D ₁ performs the confirmation.

As described above, when the outer peripheral grinding of the second eccentric portion B ₂ is performed after the eccentric workpiece W ₂ is rotated 180 ° (see FIG. 11), the first and second portions are obtained as shown in FIG. Each of the eccentric parts B ₁ and B ₂ has the same outer peripheral grinding state, and there is no problem that an unground part is generated in one of the eccentric parts.

Further, in the set example of the eccentric work W ₂ shown in FIG. 7, the phases of the first and second eccentric parts B ₁ and B ₂ are shifted with respect to 180 °, and each eccentric part B _{In this example} , the centers C ₂₁ and C _{22 of 1} and B ₂ are both set on the same side (upper side in the set example) with respect to the horizontal line passing through the center C ₁ of the shaft portion A. The set example of the core work W ₂ ′ is a set example in which the centers C ₂₁ and C _{22 of the} eccentric parts B ₁ and B ₂ are arranged on opposite sides with respect to the horizontal line passing through the center C ₁ of the shaft part A. is there. Also in this set example, the eccentric work W ₂ ′ is rotated by [(θ ₃ − (− θ ₄ ) / 2] = [(θ ₃ + θ ₄ ) / 2]) around the shaft portion A. The first and second eccentric parts B ₁ and B ₂ are arranged symmetrically with respect to the vertical line passing through the center of the shaft part A, and the grinding state of the eccentric parts B ₁ and B ₂ is the same. Note that θ ₃ and θ ₄ are both positive values.

Furthermore, in the set example shown in FIG. 14, each eccentric part of the eccentric work W ₂ ′ in which the phases of the first and second eccentric parts B ₁ and B ₂ are exactly 180 ° from the beginning. This is a set example in which the centers C ₂₁ and C ₂₂ of B ₁ and B ₂ are arranged opposite to each other with respect to a horizontal line passing through the center C ₁ of the shaft portion A. Also in this set example, by rotating the eccentric work W ₂ ″ by [(θ ₅ − (− θ ₅ ) / 2 = θ ₅ ], centering on the shaft portion A, each of the first and second parts can be obtained. The eccentric parts B ₁ and B ₂ are arranged symmetrically with respect to the vertical line passing through the center of the shaft part A, and the ground state of the eccentric parts B ₁ and B ₂ is the same, θ ₅ being Is a positive value.

A: Shaft part of eccentric work
B: Eccentric part of eccentric workpiece
B ₁ : First eccentric part of the eccentric workpiece
B ₂ : Second eccentric part of the eccentric workpiece
C _0: the processing center (axis of the spindle shaft)
C ₁ : Center of shaft
C ₂ : Center of the eccentric part
C ₂₁ : Center of the first eccentric part
C ₂₂ : center of the second eccentric portion
D: Measuring device
D ₁ : First measuring device
D ₂ : Second measuring device
e: Eccentricity of the eccentric part
F: Work rotating device
G: Grinding machine
J: Eccentric clamp device
K ₁ , K ₂ : Centering device
M: Servo motor with encoder W ₁ , W ₂ , W ₂ ', W ": Eccentric workpiece
1: Spindle shaft

Claims (5)

An eccentric clamp device capable of gripping the shaft part of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece with respect to the spindle axis of the spindle shaft which is the processing center, and being gripped by the eccentric clamp device A workpiece rotating device that is arranged on the same axis as the shaft portion to be moved forward and backward, and that grips the free end of the shaft portion to rotate the eccentric workpiece, and an upper side of the eccentric portion of the eccentric workpiece And a centering device having a measuring device for measuring the center position of the eccentric portion by bringing a pair of measuring elements into contact with the lower side, and the eccentricity being eccentric with respect to the shaft portion of the eccentric workpiece. A method for automatically centering a core,
The workpiece rotating device is configured such that a clamp tool that grips a shaft portion of an eccentric workpiece is rotated by a servo motor with an encoder,
The center position of the eccentric part is measured by the measuring device, and the rotation angle of the shaft part necessary to make the center of the eccentric part coincide with the machining center is calculated.
A servomotor constituting the work rotating device performs centering by rotating the shaft part of the eccentric work at a time by the rotation angle indexed by the encoder. High-speed automatic centering method. An eccentric clamp device capable of gripping the shaft part of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece with respect to the spindle axis of the spindle shaft which is the processing center, and being gripped by the eccentric clamp device And a workpiece rotating device for rotating the eccentric work by gripping the free end of the shaft, and a phase of the eccentric work approximately 180 °. A first and a second measuring the center position of each eccentric part by bringing a pair of measuring elements into contact with each of the upper and lower positions of the first and second eccentric parts provided differently. Using a centering device provided with each measuring device, it is a method of automatically centering two eccentric parts that are eccentric with respect to the shaft part of the eccentric work,
Measure the position of the center of each of the first and second eccentric portions by the first and second measuring devices, and each line segment connecting the center of the shaft portion and the center of each eccentric portion and a horizontal line Calculate each angle formed by, and rotate the shaft portion by a necessary angle by the work rotation device so that the respective angles become equal,
In the above state, after the outer peripheral grinding of either the first or the second eccentric portion arranged on the processing center side, the shaft portion is rotated 180 ° and the other eccentric portion is outer peripheral grounded. A high-speed automatic centering method for the eccentric part of the eccentric work.   The high speed of the eccentric part of the eccentric work according to claim 2, wherein the work rotating device is configured such that a clamp for gripping the shaft part of the eccentric work is rotated by a servo motor with an encoder. Automatic centering method. In order to carry out the invention of claim 1, it is an apparatus for automatically centering to make the center of the eccentric part of the eccentric work coincide with the processing center of the grinding machine,
An eccentric clamp device capable of gripping the shaft portion of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric workpiece with respect to the spindle axis of the spindle shaft that is the processing center, and gripped by the eccentric clamp device A work rotating device that is disposed on the same axis as the shaft so as to be able to advance and retract, and that grips the free end of the shaft and rotates the eccentric work, and a pair on the upper and lower sides of the eccentric. And a measuring device for measuring the center position of the eccentric part,
The work rotation device is a high-speed automatic centering device for an eccentric part of an eccentric work, wherein a clamp for gripping a shaft part of the eccentric work is rotated by a servo motor with an encoder. In order to carry out the invention of claim 2, an apparatus for automatically centering two eccentric parts of an eccentric work,
An eccentric clamp device capable of gripping the shaft part of the eccentric workpiece at a position eccentric by the eccentric amount of the eccentric fine groove with respect to the axis of the spindle shaft which is the processing center, and gripped by the eccentric clamp device And a workpiece rotating device that is arranged on the same axis as the shaft portion to be moved forward and backward, grips the free end of the shaft portion and rotates the eccentric workpiece, and a phase of the eccentric workpiece approximately 180. First and second measuring the center position of each eccentric part by bringing a pair of measuring elements into contact with the upper and lower positions of the first and second eccentric parts provided differently Each measuring device,
Measure the position of the center of each of the first and second eccentric portions by the first and second measuring devices, and each line segment connecting the center of the shaft portion and the center of each eccentric portion and a horizontal line And calculating the processing center of each eccentric portion by rotating the shaft portion by a necessary angle so that the angles are equal to each other. A high-speed automatic centering device for two eccentric parts of an eccentric workpiece.

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