TW201622888A - Effective diameter in-process measuring method and measuring apparatus of work for screw shaft - Google Patents

Abstract

This in-process effective diameter measurement device 12 for a threaded shaft workpiece is provided with a measurement element 13 which is arranged so as to be able to contact a thread groove in the workpiece 11 on the side opposite of the machining point, a single-axis table 17 which positions the measurement element 13 and which is linked to a grinding wheel head 9, two parallel leaf springs 55, 59 which are linked to the single-axis table 17 so as to allow elastic displacement of the measurement element 13 in the axial direction and the radial direction of the workpiece 11, and a calculation processing device 99 which, on the basis of the displacement of the measurement element 13, calculates the correction amount of the amount for a grinding wheel 7 to cut into the workpiece, and this in-process effective diameter measurement device is characterized by being provided with multiple steadying devices 67 which are arranged below the workpiece 11 on a table 5 supporting said workpiece 11 and which, by magnetic attractive force, supports the workpiece 11 in a groove 89 having a V-shaped cross-section.

Description

Measuring method and measuring device in process for effective diameter of workpiece as screw shaft

The present invention relates to a method and a measuring apparatus for a process in the process of grinding a workpiece as a screw shaft of a ball screw device.

The ball screw device is used as a mechanical element such as a work machine, a semiconductor manufacturing device, a compression molding machine, an injection molding machine, or a general conveying device. A ball screw device for such a machine is required to have high precision. The screw shaft, which is a main component of the ball screw device, is formed by a plurality of grinding processes to form a thread groove. However, in the grinding process of the screw groove of the workpiece as the screw shaft, the grinding stone is subjected to wear, heat displacement, and mechanical vibration. Due to various external factors, it is difficult to machine the cylindrical groove of the formed thread groove to 1 μm or less. Therefore, in order to improve the dimensional accuracy of the formed screw shaft, the diameter dimension of the workpiece in the grinding process is measured and controlled during the manufacturing process. That is, the effective diameter of the workpiece in which the thread groove is formed is measured in the process. If the cylinder of the thread groove in the precision ball screw is insufficient, the pre-compression dynamic torque of the ball screw may be affected. Therefore, the improvement of the grinding precision is pursued by setting the target value of the machining accuracy with a small value.

Japanese Patent No. 2590531 discloses a measurement method and a measurement device for a process in which a measuring device is coupled to a support table of a grinding wheel which is a grinding tool of a workpiece to be processed, so that the measuring device and the support table of the grinding wheel are provided. Integration, grinding and grinding of the workpiece During the work, the measuring device is brought into contact with the thread groove on the opposite side of the machining point of the workpiece, and the workpiece is clamped by the grinding wheel and the measuring device, and the workpiece is moved in the axial direction while the shaft is rotated, and the workpiece is detected by the measuring device. The radial displacement causes the cutting amount of the grinding wheel to be controlled according to the shift signal.

According to the measurement method or the measuring device in the process described in Japanese Patent No. 2590531, since the contact member is placed only on the workpiece at a position opposite to the 180° side of the processing tool, the structure is simple and can be reduced. Space constraints.

Japanese Laid-Open Patent Publication No. Hei 10-315129 discloses a grinding amount control method and a measuring device for fixing a workpiece and a dummy workpiece to a magnetic chuck on a stage of a surface grinder, and grinding the dummy workpiece slightly by using a grinding wheel. The air micrometer that is mounted on the measuring head of the grindstone cover is used as a component of the air micrometer, and the surface position of the upper surface of the dummy workpiece and the surface position of the unground workpiece are measured to determine the dummy workpiece and the workpiece. The step is confirmed, and while the display on the air micrometer is confirmed, the grinding wheel is advanced by applying the necessary amount of cut to the step, and the grinding wheel is fixed at the position to grind the workpiece.

According to the grinding amount control method and the measuring device described in Japanese Laid-Open Patent Publication No. Hei 10-315129, even if the necessary cutting amount of the workpiece is 1 μm, the grinding can be accurately performed.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent No. 2590531

Patent Document 2: Japanese Patent Laid-Open No. Hei 10-315129

However, Japanese Patent No. 2590531 does not describe when it comes from a grinding wheel. The method of supporting the workpiece under the condition of high processing pressure. That is, in Japanese Patent No. 2590531, when the grinding pressure from the grinding wheel is large, the workpiece is swept by the grinding wheel and is swung. As a result, the accuracy of the formed screw shaft will decrease. Further, although a method of supporting a workpiece for planar grinding is described in Japanese Laid-Open Patent Publication No. Hei 10-315129, a method of supporting a workpiece for grinding a thread groove is not described.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for measuring a process of an effective diameter of a workpiece as a screw shaft and an apparatus for measuring an effective diameter process, which can stably stably even if the grinding pressure from the grindstone is large. The workpiece as the screw shaft is supported to prevent the workpiece from swinging, and the dimensional accuracy of the formed screw shaft can be improved.

In order to achieve the above object, the measuring apparatus in the process of the effective diameter of the workpiece as the screw shaft of the present invention is provided in a processing tool for machining a thread groove of a workpiece as a screw shaft and a stage for supporting the workpiece. The processing apparatus further includes: a measuring device disposed to be in contact with the screw groove on a side opposite to a processing point of the workpiece by the processing tool; and a positioning device that switches the measuring device to a position contacting the thread groove And a support table that is not in contact with the thread groove, and the measuring device is coupled to the processing tool; and a support mechanism that elastically elasticizes the measuring device in an axial direction and a horizontal direction orthogonal to the axial direction of the workpiece Displaceably coupled to the positioning device; and an arithmetic processing device that calculates a correction amount of the cutting amount of the workpiece by the workpiece based on the displacement of the measuring device; and the measuring device in the process of the effective diameter of the workpiece of the screw shaft The method includes a plurality of anti-swing devices disposed on the stage and disposed on the above The bottom member, by the magnetic attraction force of the workpiece is supported on the adsorption of the V-shaped groove cross section.

Further, preferably, the measuring device in the process of the effective diameter of the workpiece as the screw shaft of the present invention is characterized in that the anti-swing device is a magnetic block fixed to the stage and generating the magnetic attraction force, and The surface side is formed by a support block having a V-shaped groove as described above and detachably attached to the upper surface of the magnetic block.

Further, it is preferable that the measuring device in the process of the effective diameter of the workpiece as the screw shaft of the present invention is characterized in that the groove having a V-shaped cross section is a groove surface opposite to a processing point of the workpiece with respect to the workpiece. There is a tilt angle which is closer to the vertical than the groove surface on the processing point side.

Further, it is preferable that the measuring device in the process of the effective diameter of the workpiece as the screw shaft of the present invention is characterized in that the anti-swing device can change the magnitude of the magnetic attraction force.

Further, it is preferable that the measuring device in the process of the effective diameter of the workpiece as the screw shaft of the present invention is characterized in that the anti-swing device can be replaced with a cross-section V having a groove having a size different from that of the V-shaped cross section. Other support blocks for the groove.

Further, the measuring method in the process of the effective diameter of the workpiece as the screw shaft of the present invention is provided with a processing tool for processing a thread groove of a workpiece as a screw shaft and a processing apparatus for supporting the workpiece of the workpiece. And arranging the measuring device by a positioning device that connects the measuring device and the support table of the processing tool such that the measuring device contacts the thread groove opposite to the processing point of the processing tool to the workpiece, and based on the measuring device Displacement to correct the amount of cutting of the workpiece by the processing tool; the method for measuring the effective diameter of the workpiece as the screw shaft is characterized by being placed on the stage and disposed under the workpiece and utilizing magnetic attraction The workpiece is supported by the anti-sway device that supports the workpiece to be supported by a groove having a V-shaped cross section.

According to the present invention, it is possible to provide a workpiece as a screw shaft which can stably support a workpiece as a screw shaft to prevent the workpiece from swinging even if the grinding pressure from the grindstone is large, and can improve the dimensional accuracy of the screw shaft after forming. Measuring method in the diameter process and measuring device in the effective diameter process.

1‧‧‧Spiral Grinder

3‧‧‧ bed

5‧‧‧ stage

7‧‧‧ grinding wheel

9‧‧‧Minestone

11‧‧‧Workpiece

12‧‧‧Measurement device in effective diameter process

13‧‧‧Measurer

15‧‧‧Rotating plate

17‧‧‧ Single-axis stage

19‧‧‧Axis components

21‧‧‧Cylinder unit

23‧‧‧ piston rod

25‧‧‧ Positioning Stops

27‧‧‧ pulse motor

29‧‧‧movable department

31‧‧‧Up and down slider

33‧‧‧ front and rear sliders

35‧‧‧ left and right slider

37‧‧‧ Feeding screws in the up and down direction

39‧‧‧Clamping bolts up and down

41‧‧‧ Front and rear direction feed screws

43‧‧‧ Front and rear direction clamping bolts

45‧‧‧feed screw in the left and right direction

47‧‧‧ clamping bolts in the left and right direction

49‧‧‧ bracket

51‧‧‧Proximity switch

53‧‧‧rails

55‧‧‧Parallel plate spring for measuring device float

57‧‧‧buoy

59‧‧‧Parallel plate spring for measuring direction shift

61‧‧‧Contact film

63‧‧‧Electrical micrometer

65‧‧‧ bracket

67‧‧‧Anti-swing device

69‧‧‧Magnetic blocks

71‧‧‧Support block

73‧‧‧Protruding

75‧‧‧Bolt holes

77‧‧‧ Section

79‧‧‧Bolt holes

81‧‧‧1st ridge

83‧‧‧2nd ridge

85‧‧‧1st slant

87‧‧‧The slope of the 2nd ridge

89‧‧‧V slot

91‧‧‧Bolt holes

93‧‧‧Operation handle

95‧‧‧Amplifier

97‧‧‧A/D converter

99‧‧‧calculation processing device

101‧‧‧CRT display department

103‧‧‧Plotter

Fig. 1 is a schematic side view of the measuring device in the effective diameter process of the embodiment, showing the state in the measurement and grinding operation.

Figure 2 is an enlarged side elevational view of portion A of Figure 1.

Figure 3 is a front view of the arrow 3-3 of Figure 2.

Figure 4 is a side view of the arrow 4-4 of Figure 3.

Fig. 5A is an enlarged plan view of the magnetic block, Fig. 5B is a view taken along line b-b of Fig. 5A, and Fig. 5C is a view taken along line c-c of Fig. 5B.

Fig. 6A is an enlarged plan view of the support block, and Fig. 6B is a view taken along line b-b of Fig. 6A.

7A, 7B, and 7C are side views of the measuring device in the effective diameter process, FIG. 7A shows the state in which the measuring device is in the non-measuring position, FIG. 7B shows the state in which the measuring device is in the measurement preparation position, and FIG. 7C shows that the measuring device is in the measuring state. The status of the location.

Hereinafter, an embodiment of a measuring device in the process of the effective diameter of the workpiece as the screw shaft (hereinafter referred to as "measuring device in the effective diameter process") and a measuring method in the effective diameter process will be described with reference to the drawings. In the present embodiment, the present invention is applied to a screw grinder.

First, define the terms and directions in this manual. In the present specification, the "workpiece" refers to a cylindrical member that is a screw shaft of a ball screw device after being machined, and is in a state before the outer circumferential surface side is ground to form a screw groove, or a grinding groove is formed by grinding. The state of the process.

Further, in the present specification, the front side and the back side of the spiral grinder for grinding the workpiece are respectively referred to as the front side and the rear side, and the left and right direction and the up and down direction are the left and right directions and the upper and lower sides in the state in which the spiral grinder is viewed from the front side. The same direction.

Fig. 1 is a schematic side view of a screw grinder including a measuring device in an effective diameter process according to the present embodiment, and shows a state in measurement and grinding operation. In Fig. 1, the left side of the paper surface is the front side of the spiral grinder, that is, the front side, and the right side of the paper surface is the rear side, that is, the back side. Further, the paper surface is on the left side of the spiral grinder, and the paper side is on the right side. Further, the upper side of the paper surface is on the upper side of the screw grinder, and the lower side of the paper surface is on the lower side of the spiral grinder.

As shown in Fig. 1, a screw grinder 1 as a processing device for a screw shaft includes a bed body 3 as a main body, a stage 5 extending in the left-right direction and movably disposed in the left-right direction on the bed 3, and a bed body. 3, the grinding stone table 9 supporting the grinding wheel 7 via a shaft member (not shown), and the measuring device 12 in the effective diameter process for measuring the effective diameter of the workpiece 11 supported in the processing of the stage 5. The workpiece 11 extends in the left-right direction and is supported by the stage 5.

In the stage 5, a spindle head (not shown) is provided on one side in the left-right direction, and a tailstock (not shown) is provided on the other side in the left-right direction. The spindle table supports one end of the workpiece 11 and rotates the workpiece 11, and the tailstock rotatably supports the workpiece 11 at the center of the other end surface of the workpiece 11. Therefore, the workpiece 11 is rotatably supported by the stage 5 via the spindle stage and the tailstock in a state in which both ends are supported by the spindle head and the tailstock.

Since the workpiece 11 is supported by the stage 5 as described above, it moves together with the movement of the stage 5 in the left-right direction. The machining point of the grinding wheel 7 to the workpiece 11 is as shown in Fig. 1, and is a portion of the outer peripheral surface of the workpiece 11 located on the back side of the auger grinder 1. The workpiece 11 being processed is rotated by a spindle head (not shown), and moves in the axial direction, that is, the left-right direction, together with the movement of the stage 5. The screw groove 7 of the workpiece 11 is ground by the grinding wheel 7 by the rotation of the workpiece 11 and the movement to the left and right direction.

In the effective diameter process of the present embodiment, the measuring device 12 measures the effective diameter of the workpiece 11 by the displacement of the measuring device 13 of the workpiece 11 in contact with the machining. As shown in FIG. 1, in the measurement state, the measuring device 13 is disposed on the side of the spiral grinder 1 on the opposite side to the grinding wheel 7 on the opposite side to the central axis of the workpiece 11 with respect to the grinding wheel 7. The measuring device 13 is in contact with a portion of the outer peripheral surface of the workpiece 11 which is located on the side before the spiral grinding machine 1. Therefore, the workpiece 11 is subjected to measurement and grinding of the effective diameter in a state where the measuring device 13 and the grinding wheel 7 are opposed to each other with respect to the central axis of the workpiece 11 in the front-rear direction.

Next, a configuration of a support for arranging the measuring device 13 on the side before the screw grinder 1 will be described. In the measurement state shown in FIG. 1, the rotating plate 15 which is disposed to extend horizontally in the front-rear direction through the workpiece 11 near the upper portion of the side surface of the grinding wheel 7, and the single-axis positioning device for measuring the lower surface of the rotating plate 15 The stage 17 and the measuring device 13 are connected to the stone table 9. The side of the grindstone table 9 on the side of the grindstone 15 is connected to the shaft member 19 provided on the grindstone table 9, and the front end of the swivel plate 15 is rotatable in the upward direction about the shaft member 19. A cylinder device 21 is provided on the upper portion of the grindstone table 9, and the front end of the piston rod 23 of the cylinder device 21 is coupled to the upper surface of the rotary plate 15. As shown in Fig. 1, the cylinder device 21 is driven to move the piston rod 23, whereby the rotary plate 15 is rotated from the horizontal state toward the front end toward the upper direction, or from the front end. The upper state is rotated toward the lower end toward the lower side to be in a horizontal state. The grinding table 9 is provided with a positioning stopper 25 for prohibiting the rotation of the rotating plate 15 when the rotating plate 15 is in a horizontal state, that is, in the measurement state of the measuring device 13.

The single-axis stage 17 for measuring the positioning of the measuring device is provided to the feeding screw shaft via a feed screw shaft (not shown) that is rotated by a pulse motor 27 provided at an end of the single-axis stage 17 A linear guide for axial movement. The single-axis stage 17 is fixed to the rotary plate 15 in the extending direction of the rotary plate 15, and rotates together with the rotation of the rotary plate 15. In the present embodiment, the single-axis stage 17 is disposed such that the movable portion 29 moves in the front-rear direction of the auger grinder 1. The movable portion 29 is located on the lower surface side of the uniaxial stage 17, and a slider assembly including a plurality of sliders, which will be described later, is inserted through the movable portion 29 in the vertical direction. In the slider assembly, as described below, the measuring device 13 is attached in a state of being elastically supported.

2 is an enlarged side view of the portion A of FIG. 1, FIG. 3 is a front view of the arrow 3-3 of FIG. 2, and FIG. 4 is a side view of the arrow 4-4 of FIG. As shown in FIGS. 2 to 4, the single-axis stage 17 is provided with upper and lower sliders 31 that penetrate the movable portion 29 and are movable in the vertical direction with respect to the single-axis stage 17. The front and rear sliders 33 are provided at the lower portion of the upper and lower sliders 31 so as to be horizontally movable in the direction in which the uniaxial stage 17 is extended, that is, in the front and rear directions of the screw grinder 1. Further, left and right sliders 35 are provided on the lower portion of the front and rear sliders 33 so as to be horizontally movable in the longitudinal direction of the workpiece 11 supported by the stage 5, that is, in the left-right direction of the screw grinder 1. The sliders 31, 33, 35 can be moved in the various directions described above by a known manual feed screw mechanism, and can be clamped to each of the predetermined positions by bolt fasteners. The 37 series feeds the screw in the up and down direction, the 39 series moves the clamping bolts in the up and down direction, the 41 series feeds the screws in the front and rear direction, the 43 series moves the clamping bolts in the front and rear direction, the 45 series feed screws in the left and right direction, and the 47 series moves in the left and right direction. Clamp the bolts.

As shown in FIGS. 3 and 4, a bracket 49 that extends downward is adjacent to the sliders 31, 33, and 35 on the lower surface of the movable portion 29 of the uniaxial stage 17. The bracket 49 is configured by connecting three members 49a, 49b, and 49c, and is positionally adjustable in up, down, left and right, and front and rear. A proximity switch 51 for positioning the measuring device is mounted on the lower end of the bracket 49. The proximity switch 51 is disposed at a position substantially equal to the height of the measuring device 13 and is positionally adjustable in the front-rear direction with respect to the bracket 49.

The lower portions of the left and right sliders 35 are partially exposed from the guide rails 53 of the left and right sliders 35, and as shown in FIGS. 2 and 3, in the exposed portion, the plate surface is attached to the axial direction of the workpiece 11, that is, the screw grinder 1 The pair of parallel plate springs 55, 55 are supported by the measuring device floating support in the left-right direction and downward. A floating block 57 is attached to the lower ends of the pair of leaf springs 55, 55. In the floating block 57, a pair of parallel plate springs in which the plate faces are displaced toward the radial direction of the workpiece 11 orthogonal to the axial direction of the workpiece 11, that is, the direction in which the spiral grinder 1 is moved in the front-rear direction and downward, respectively. 59, 59.

As shown in FIG. 2, the measuring device 13 is horizontally attached to the lower portion of the pair of leaf springs 59 and 59 for the measurement direction displacement, and penetrates through the pair of leaf springs 59 and 59. A contact piece 61 is provided at the front end of the measuring device 13, and the contact piece 61 is formed to be a threaded groove of the workpiece 11 which is suitable for measuring the pressure contact by the elastic force of the leaf spring 59 for measuring the direction of displacement. The size and shape. For example, in the workpiece 11 formed as the screw shaft of the ball screw device as shown in the present embodiment, the contact piece 61 is composed of super-hard balls having the same size as the balls assembled to the ball screw device.

The end of the measuring device 13 opposite to the contact piece 61 abuts against the electrical micrometer 63. The electrical micrometer 63 is held by a pair of leaf springs 55 mounted on the measuring device floating support, 55 bracket 65. The displacement of the contact piece 61 of the measuring device 13 in the front-rear direction, that is, the radial displacement of the workpiece 11 is detected by the electrical micrometer 63. Further, the contact piece 61 of the measuring device 13 is in contact with the thread groove of the workpiece 11 at a position which is substantially 180°, that is, a half lead, from the grinding point of the grinding wheel 7 to the center axis of the workpiece 11. Further, the plate springs 55 and 55 for measuring the floating support of the measuring device are perpendicular to the positional springs 59 and 59 for shifting the measurement direction of the contact piece 61 corresponding to the workpiece 11, and the measuring device is used for floating support. The plate springs 55 and 55 are floatingly supporting the measuring device 13 so that the shaking of the workpiece 11 during the grinding process, that is, shaking, does not affect the measurement. By thus supporting the measuring device 13 in a floating manner, the axial direction of the contact piece 61, that is, the axial direction of the workpiece 11, is absorbed by the leaf springs 55 and 55 for measuring the floating support of the measuring device, and therefore, the measuring device 13 measures only The axial direction of the workpiece 11 is orthogonal to the radial displacement of the workpiece 11.

Next, the state of support of the workpiece 11 on the stage 5 will be described. In the present embodiment, as described above, the workpiece 11 is supported by the stage 5 via the spindle stage and the tailstock in a state in which both ends are supported by a spindle table (not shown) and a tailstock (not shown). In order to prevent the swing of the workpiece 11 thus supported by the stage 5 and to measure the accurate effective diameter, the measuring device 12 of the effective diameter process of the present embodiment is provided with a plurality of anti-swing devices 67 for supporting the intermediate position of the workpiece 11. (Refer to Figure 1). Each of the anti-swaying devices 67 is composed of a magnet block 69 fixed to the upper surface of the stage 5, and a support block 71 attached to the magnet block 69 and contacting the workpiece 11 to support the workpiece 11. The plurality of anti-sway devices 67 are disposed on the stage 5 at predetermined intervals along the axial direction of the workpiece 11.

5A is an enlarged plan view of the magnetic block 69, FIG. 5B is an arrow view of b-b of FIG. 5A, and FIG. 5C is an arrow view of c-c of FIG. 5B. Further, in Fig. 5A, the paper surface is oriented in the left-right direction of the auger grinder 1, the left side of the paper surface is the front side of the auger grinder 1, and the right side of the paper surface is the side after the spiral grinder 1.

Fig. 6A is an enlarged plan view of the support block 71, and Fig. 6B is a view taken along line b-b of Fig. 6A. Further, in Fig. 6A, the paper surface is oriented in the left-right direction of the auger grinder 1, the left side of the paper surface is the front side of the auger grinder 1, and the right side of the paper surface is the side after the spiral grinder 1.

As shown in each of FIGS. 5A, 5B, and 5C, the magnetic block 69 has a rectangular parallelepiped shape, and four protruding portions 73 projecting in the horizontal direction are formed in the lower portion. As shown in FIG. 5A, bolt holes 75 penetrating in the vertical direction are provided in the respective protruding portions 73, and bolts (not shown) are screwed into the bolt holes 75, whereby the magnet block 69 is fixed to the upper surface of the stage 5. . As shown in FIGS. 5A and 5B, the front side edge portion of the upper surface of the magnet block 69 protrudes upward to form a segment portion 77. The front side end surface of the support block 71 mounted on the upper surface of the magnet block 69 abuts against the segment portion 77, whereby the positioning of the support block 71 in the front and rear directions is achieved. Further, a bolt hole 79 is provided in the vicinity of each vertex of the upper surface of the magnet block 69.

The support block 71 is made of a magnetic material and has a rectangular parallelepiped shape as shown in each of FIGS. 6A and 6B. The support block 71 is formed with a first ridge 81 having a triangular cross-sectional shape and extending in the left-right direction of the spiral grinder 1 on the side edge portion of the upper surface, and a cross section is formed adjacent to the front side of the first ridge 81. The second ridge 83 is triangular in shape and extends in the left-right direction of the auger 1 . A groove 89 having a substantially V-shaped cross section is formed by the front side inclined surface 85 of the first ridge 81 and the rear side inclined surface 87 of the second ridge 83 (hereinafter, the groove is simply referred to as "V-shaped groove 89"). Therefore, the rear side inclined surface 87 of the second ridge 83 constitutes the front side groove surface of the V-shaped groove 89, and the front side inclined surface 85 of the first ridge 81 constitutes the groove side after the V-shaped groove 89. Hereinafter, the rear side inclined surface 87 of the second ridge 83 is referred to as "the front side groove surface 87 of the V-shaped groove 89", and the front side inclined surface 85 of the first ridge 81 is referred to as "the rear side groove of the V-shaped groove 89". Face 85".

The front side groove surface 87 of the V-shaped groove 89 is formed at an inclination angle closer to the vertical than the groove side surface 85 of the V-shaped groove 89. Moreover, as shown in FIG. 6B, the top of the second ridge 83 It is located above the top of the first ridge 81. Therefore, the front side groove surface 87 of the V-shaped groove 89 has a steeper inclination than the rear side groove surface 85 and extends to the upper side. In the present embodiment, the rear side groove surface 85 of the V-shaped groove 89 is inclined at an angle of about 30 with respect to the horizontal, and the front side groove surface 87 has an inclination angle of 45 or more with respect to the horizontal, specifically A tilt angle of about 60° with respect to the horizontal. As shown in FIG. 6B, the workpiece 11 is supported by the V-shaped groove 89 at two points. The support block 71 penetrates the bolt hole 91 corresponding to the bolt hole 79 on the upper surface of the magnet block 69 in the vertical direction, and is fixed to the magnet block 69 by screwing a bolt (not shown) to the bolt hole 91. surface. Further, in the following description, the support block 71 is also referred to as "V block 71".

The magnet block 69 and the V block 71 of the anti-swing device 67 are configured as described above, so that the magnetic attraction force of the magnet block 69 acts on the workpiece 11 via the V block 71, and the workpiece 11 is adsorbed to the V-shaped groove by two points of support. 89. As shown in FIG. 5C, on the side of the magnetic block 69, an opening for magnetic attraction of the magnetic block 69 is provided. The operation handle 93 that closes (ON.OFF) the operation and adjusts the magnetic attraction force. When the magnetic gripping of the magnet block 69 is turned off by operating the operation knob 93, the magnetic attraction force is lost, and the workpiece 11 can be easily detached from the V block 71.

Next, the measurement operation of the measuring device 12 in the effective diameter process of the present embodiment will be described.

7A, 7B, and 7C are side views of the measuring device 12 in the effective diameter process, and Fig. 7A shows the state in which the measuring device 13 is in the non-measuring position. Specifically, the measuring device 13 is away from the workpiece 11 in a state where the front end of the rotating plate 15 and the uniaxial stage 17 is rotated upward. Fig. 7B shows a state in which the measuring device 13 is at the measurement preparation position. Specifically, the rotating plate 15 and the single-axis stage 17 are horizontal, and the measuring device 13 is located in the vicinity of the workpiece 11 while being separated from the workpiece 11. Fig. 7C shows a state in which the measuring device 13 is at the measurement position. In detail, it is made from the state shown in FIG. 7B. The movable portion 29 of the uniaxial stage 17 moves to bring the measuring device 13 into contact with the workpiece 11.

First, the workpiece 11 is placed on the stage 5 in a predetermined state. That is, the operator arranges the operation knob 93 of each of the magnet blocks 69 in a closed state, and arranges the workpiece 11 at two points so as to be supported by the V-shaped grooves 89 of the V blocks 71 of the respective anti-swing devices 67, and the workpiece 11 is placed. Each end portion is attached to a spindle head (not shown) of the stage 5 and a tailstock (not shown). After the arrangement of the workpieces 11 to the stage 5 is completed, the operation handles 93 of the respective magnet blocks 69 are turned on, and the workpieces 11 are attracted to the respective V blocks 71 by the magnetic attraction force. The operator manipulates the cylinder device 21 and the pulse motor 27 of the single-axis stage 17 to move the measuring device 13 to a position close to the measurement position shown in Fig. 7C. In this state, the operator adjusts the position of the measuring device 13 in the up-and-down direction, the front-rear direction, and the left-right direction using the sliders 31, 33, and 35 (see FIGS. 2 to 4), and gently touches the contact piece 61 of the measuring device 13 The positional relationship between the proximity measuring switch 51 (see FIG. 4) of the measuring device and the measuring device 13 is set in such a manner as to contact the screw groove of the workpiece 11. Thereafter, the operator manipulates the cylinder device 21 and the pulse motor 27 of the uniaxial stage 17 to return the measuring device 13 to the measurement preparation position shown in Fig. 7B, and returns to the non-measurement position of Fig. 7A. Further, the stage 5 is moved so that the grinding wheel 7 and the measuring device 13 are positioned at the grinding start point of the workpiece 11.

Thereafter, after the grinding process is started, the cylinder device 21 and the pulse motor 27 of the uniaxial stage 17 are driven by the control of the control system of the screw grinder 1, and the measuring device 13 is moved from the non-measurement position of Fig. 7A to Fig. 7B. The measurement preparation position is moved, and further moved to the measurement position of FIG. 7C. The contact piece 61 of the measuring device 13 contacts the thread groove of the workpiece 11, and starts measuring the effective diameter of the workpiece 11.

Even if there is a slight variation in the feed amount of the grinding wheel 7 or a change in the lead of the thread groove of the workpiece 11, or a variation in the amount of grinding due to the bending of the workpiece 11, the measuring device 13 The pair of parallel plate springs 55, 59 (see Figs. 2 to 4) are pressed against the workpiece 11, so that the contact piece 61 does not leave the thread groove of the workpiece 11. The radial displacement of the measuring device 13 due to the contact of the contact piece 61 with the thread groove is obtained by the electrical micrometer 63, and is processed by the amplifier 95 (refer to FIG. 1) and the A/D converter 97 by the arithmetic processing device. 99 calculates a difference in the effective diameter of the workpiece 11, that is, a deviation, and outputs a correction command for the cutting amount of the stone table 9. Further, the measurement results are displayed on the CRT display unit 101 and the plotter 103. At this time, the amount of correction of the amount of cutting of the grindstone table 9 is first stored as a reference in the calculation processing device 99, and then compared with the measured value obtained in sequence for the reference data of the memory. It is calculated by the arithmetic processing unit 99. The calculation processing device 99 cuts in the servo motor output correction command to the stone table (not shown) based on the calculated correction amount, and controls the stone table to cut into the servo motor so that the effective diameter of the workpiece 11 is always the reference value immediately after the measurement. The same size.

After the correction of the cutting amount of the grindstone table 9 and the grinding of one stroke, the movable portion 29 holding the single-axis stage 17 of the measuring device 13 is driven, and the measuring device 13 is moved to the measurement preparation position (see FIG. 7B). The single-axis stage 17 is rotated upward and retracted together with the rotary plate 15, and the measuring device 13 is moved to a non-measurement position (see FIG. 7A). Then, the operation of FIG. 7B and further FIG. 7C is performed again from the state shown in FIG. 7A, and the grinding process and measurement are started. In this manner, the measurement is performed in the effective diameter process of the workpiece 11 in the auger grinder 1, and the feedback control for correcting the grinding wheel cutting position and the grinding processing of the workpiece 11 are performed based on the measured data.

In the present embodiment, in the grinding process, the workpiece 11 is stably supported by the V-shaped grooves 89 of the respective V blocks 71 by the magnetic attraction force of the plurality of magnetic blocks 69. Therefore, the swing of the workpiece 11 in the grinding process of the workpiece 11 can be prevented. Moreover, the V-shaped groove 89 of each V block 71 The front side groove surface 87, that is, the groove surface which is disposed on the opposite side of the processing point of the grinding wheel 7 through the workpiece 11 has a steeper inclination than the rear side groove surface 85, and extends to the upper side, so even if the grinding wheel 7 is ground The machining pressure is large, and the workpiece 11 can be prevented from swinging forward by the front side groove surface 87. Therefore, in the grinding process, the workpiece 11 can be stably held in the V-shaped groove 89 without swinging. As a result, the dimensional accuracy of the screw shaft after forming can be improved.

Further, in the effective diameter process of the present embodiment, the measuring device 12 can easily remove the V block from the magnet block 69 by releasing the bolt of the bolt that fixes the V block 71 to the magnet block 69, thereby pulling out the bolt from the bolt hole. 71. That is, the V block 71 is detachably attached to the magnet block 69. Therefore, as long as a plurality of V-blocks 71 having V-shaped grooves 89 of various depth dimensions are prepared, the workpieces 11 of a plurality of diameter sizes can be replaced by replacing the V-blocks 71. In other words, even if the diameter of the workpiece 11 is changed, the V block 71 having the V-shaped groove 89 having a diameter suitable for the changed workpiece 11 can be replaced, and the dimensional accuracy of the screw shaft after molding can be improved.

Further, in the effective diameter process of the present embodiment, the measuring device 12 can manipulate the operating handle 93 (refer to FIG. 5C) to adjust the magnetic attraction force of the magnetic block 69 to a size suitable for the size of the workpiece 11, that is, the outer diameter and the length. Or the size of the weight. Therefore, it is possible to prevent a situation in which the magnetic attraction force is excessively large for the size of the workpiece 11 to hinder the rotation of the workpiece 11, or the magnetic attraction force is too small and the workpiece 11 is swung during the grinding process. When the diameter of the workpiece 11 is changed, the magnitude of the magnetic attraction force can be adjusted according to the size of the workpiece 11 after the change. As described above, according to the present embodiment, regardless of the diameter of the workpiece 11 and even if the grinding pressure of the grinding wheel 7 is large, the workpiece 11 can be stably held in the V-shaped groove 89 of the V block 71 to prevent the swing. As a result, the dimensional accuracy of the screw shaft after forming can be improved.

1‧‧‧Spiral Grinder

3‧‧‧ bed

5‧‧‧ stage

7‧‧‧ grinding wheel

9‧‧‧Minestone

11‧‧‧Workpiece

12‧‧‧Measurement device in effective diameter process

13‧‧‧Measurer

15‧‧‧Rotating plate

17‧‧‧ Single-axis stage

19‧‧‧Axis components

21‧‧‧Cylinder unit

23‧‧‧ piston rod

25‧‧‧ Positioning Stops

27‧‧‧ pulse motor

29‧‧‧movable department

63‧‧‧Electrical micrometer

67‧‧‧Anti-swing device

69‧‧‧Magnetic blocks

71‧‧‧Support block

89‧‧‧V slot

95‧‧‧Amplifier

97‧‧‧A/D converter

99‧‧‧calculation processing device

101‧‧‧CRT display department

103‧‧‧Plotter

Claims (6)

A process measuring apparatus for an effective diameter of a workpiece as a screw shaft, which is provided in a processing apparatus including a processing tool for machining a screw groove as a workpiece of a screw shaft and a stage for supporting the workpiece, and comprising: a measuring device configured to be contactable with the thread groove opposite to a processing point of the workpiece by the processing tool; and a positioning device that switches the measuring device to a position contacting the thread groove and not contacting the thread groove And a position of the measuring device coupled to the support table of the processing tool; and a supporting mechanism that elastically displaces the measuring device in the radial direction orthogonal to the axial direction of the workpiece in the axial direction and the horizontal direction a positioning device; and an arithmetic processing device that calculates a correction amount of the cutting amount of the workpiece by the processing tool based on the displacement of the measuring device; and the measuring device in the process of the effective diameter of the workpiece as the screw shaft is characterized by: Anti-swing device, the anti-swing device is located on the stage and disposed under the workpiece, and is magnetically attracted The suction force of the workpiece supported by the V-shaped cross section of the groove. The apparatus for measuring in the process of the effective diameter of the workpiece of the screw shaft according to the first aspect of the invention, wherein the anti-swing device is a magnetic block fixed to the stage and generating the magnetic attraction force, and the upper surface side A groove having a V-shaped cross section is formed and detachably attached to a support block on the upper surface of the magnetic block. The apparatus for measuring in the process of the effective diameter of the workpiece of the screw shaft according to the first aspect of the patent application, wherein the groove of the V-shaped cross section is larger than the groove surface of the processing tool opposite to the processing point of the workpiece. The groove surface on the processing point side is closer to the vertical inclination angle. The apparatus for measuring in the process of the effective diameter of the workpiece of the screw shaft according to the first aspect of the patent application, wherein the anti-swing device can change the magnitude of the magnetic attraction force. The apparatus for measuring in the process of the effective diameter of the workpiece of the screw shaft according to any one of claims 2 to 4, wherein the anti-swing device is replaceable with a groove having a size different from that of the cross section. The other support blocks of the V-shaped groove of the section. A method for measuring a process of an effective diameter of a workpiece as a screw shaft, the method comprising: a processing tool for processing a thread groove of a workpiece as a screw shaft; and a processing device for supporting a stage of the workpiece, Locating the measuring device by a positioning device that connects the measuring device to the support table of the processing tool so as to contact the thread groove opposite to the processing point of the processing tool to the workpiece, and based on the displacement of the measuring device Correcting the cutting amount of the processing tool for the workpiece; the method for measuring the effective diameter of the workpiece as the screw shaft is characterized in that the workpiece is placed on the stage and disposed under the workpiece and magnetically attractive The anti-swing device supported by the groove of the V-shaped section is adsorbed to support the workpiece.