JPH02109673A - Multi-stage grinding device - Google Patents

Abstract

PURPOSE:To improve working accuracy and to increase working efficiency by arranging a main shaft base table moved in a 1st horizontal direction parallel to the axial line of a work and in a 2nd horizontal direction orthogonal therewith and a turret head revolved centering around the shaft parallel to the 2nd horizontal direction and fitted with plural grindstones. CONSTITUTION:Multistage grinding is performed by changing grindstone 27-29 by revolving a turret head 22. In this case, the revolving center shaft of the turret head 22 is orthogonal with the axial line of the work W held on the main shaft base 6 of the main shaft base table 3 above, so the revolving direction of the turret head 22 becomes in the tangent direction of the work W and the positional dispersement by the revolving of the turret head 22 is generated in the revolving direction. So that, the positional dispersement of the turret head 22 becomes in the tangent direction of the work W and the positional dispersion of the turret head 22 in the radial direction of the work W giving effect on the work working accuracy is reduced. Consequently, the working accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multi-step grinding device suitable for, for example, grinding a raceway of a ball bearing.

Problems with Prior Art and Inventions For example, when grinding the inner ring of a ball bearing, conventionally, a first grinder first grinds both end faces, a second grinder grinds the outer diameter, and a third grinder grinds the inner ring. A machine was used to grind the outer raceway groove, and finally a fourth grinder was used to grind the inner diameter.

A machining center is known as a machine tool that performs multi-step machining with one chucking operation, but when multi-step grinding is performed using a machining center, the following problems arise.

The tool changer of a machining center replaces the tool at the nose end of the spindle, so changing the tool will cause zero damage to the tool.
．． Run-out of 0.001 to 0.01 degrees occurs, deteriorating machining accuracy. Therefore, in grinding processes that require high precision, dressing is required every time the tool is changed.
The processing time increases accordingly. In particular, recently, CBN and diamond have been increasingly used as grinding abrasive grain materials, but these abrasive grains are hard and require a longer dressing time.

As a grinding device that performs multiple machining processes with one chucking, it is possible to consider a device in which multiple grinding wheels are attached to a turret head that rotates around an axis that is perpendicular to a horizontal axis that is perpendicular to the axis of the workpiece. In this case, the direction of the turret head rotation index (index) and the cutting direction of the workpiece are in the same direction, and variations in the position of the turret head rotation index directly result in variations in machining accuracy, resulting in a decrease in machining accuracy. Come.

An object of the present invention is to solve the above problems and provide a multi-step grinding device that is efficient and has good processing accuracy.

Means for Solving the Problems A multi-step grinding apparatus according to the present invention includes a headstock for holding and rotating a workpiece, a first horizontal direction parallel to the axis of the workpiece, and a first horizontal direction on which the headstock is mounted, and a first horizontal direction parallel to the axis of the workpiece and a first horizontal direction perpendicular to this. a headstock table that is moved in a second horizontal direction; a turret head that is rotated about an axis parallel to the second horizontal direction and to which a plurality of grindstones are attached; The present invention is characterized in that it includes a numerical control device that controls movement in a direction using numerical commands.

A plurality of grindstones and a workpiece size measuring device are attached to the turret head, and dimension corrections are sometimes performed during grinding based on the measurement results of the workpiece size by the workpiece size measuring device.

In addition, a dressing device is installed on the headstock table, and a grindstone measuring device is installed on the turret table to which the turret head is attached, which uses image processing to measure the dimensions of the grinding wheel that has been rotated to a predetermined position. Dressing of the grindstone and grinding of the workpiece may be performed based on the measurement results of the grindstone dimensions.

A grindstone measuring device may be used to check whether a grindstone of a set size is attached to each position of the turret head.

Multi-step grinding is performed by rotating the working turret head and replacing the grindstone.

Since the center axis of rotation of the turret head is perpendicular to the axis of the workpiece, the direction of rotation of the turret head is tangential to the workpiece. Positional variations due to rotation of the turret head occur in the direction of rotation. Therefore, the positional variation of the turret head is in the tangential direction of the workpiece, and the positional variation of the turret head in the radial direction of the workpiece, which affects the workpiece machining accuracy, is small. Therefore, machining accuracy is good.

Since the light headstock is moved without moving the heavy turret head, less kinetic energy is required and positioning accuracy is high, allowing for highly accurate machining.

By correcting the dimensions during grinding based on the measurement results of the workpiece dimensions by the workpiece dimension measuring device, stable finished dimensions can be ensured without producing defective products.

The provision of the grindstone measuring device eliminates the need to input troublesome data regarding the grindstone dimensions, and dressing of the grindstone and grinding of the workpiece can be performed based on the results of the 7111 determination of the grindstone dimensions by the grindstone measuring device. This prevents the grindstone from colliding with the dressing device or workpiece, allowing efficient dressing and grinding.

In addition, it is possible to check whether a grindstone of a set size is attached to each position of the turret head.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 3 show the overall configuration of a numerically controlled multi-step grinding device. FIG. 1 is a perspective view, FIG. 2 is a plan view, and FIG. 3 is a front view. In addition, in the following explanation, the front side is
The back side is the rear, and the left and right as seen from the front are the left and right. That is, the lower side of FIG. 2 is the front, the upper side is the rear, and the left and right sides of FIGS. 2 and 3 are the left and right.

A two-axis table (2) is placed on the bed (1), and an X-axis table (headstock table) (3) is placed on the left side of the two-axis table (2). 2-axis table (2)
For example, 2 using a servo motor and a ball screw, etc.
The shaft drive device (4) moves the bed (1) in the left and right directions (2).
The X-axis table (3) is moved in the front-rear direction (X-axis direction) on the two-axis table (2) by a similar X-axis drive device (5).

A headstock (8) is placed on the front part of the X-axis table (3), and a dressing device (7) is placed on the rear part.

The headstock (6) has a main shaft (8) parallel to the two axes,
As shown in detail in FIG. 4, a suitable chuck (9) for holding and rotating the workpiece (ν) is attached to the right end of the main shaft (8). Note that the workpiece (W) is held by the chuck (9) so that its axis is parallel to the two axes. A rightward dimension measurement reference surface (9a) is provided on a flange-shaped portion projecting to the outside of the chuck (9).

Details of the dressing device (7) are shown in FIGS. 5-7.

A substantially U-shaped base (11) that protrudes upwardly and downwardly into two branches toward the right side is fixed to the upper surface of the X-table (3). A bearing unit (12) is vertically provided on the upper surface of the upper protrusion (lla) of the base (11).
The vertical upper swing 1111 (13) received by the bearing unit (12) and the upper protrusion (11) of the base (11)
lla) vertically. The lower protrusion (llb) of the base (11) receives a vertical lower pivot shaft (14) coaxial with the upper pivot shaft (13).

The lower end of the upper pivot shaft (13) protrudes downward from the upper protrusion (lla) of the base (11), and the lower end of the upper pivot shaft (14) protrudes upward from the lower protrusion (llb) of the base (11).
), both ends of a substantially U-shaped pivot member (15) are fixed to the upper end of the pivot member (15). The rotating member (15) is driven by a drive device (1) using a servo motor, a worm gear mechanism, etc.
6), the two rotating members (15
A holder (17) is fixed to the middle part of ) with a bolt (18), and a diamond (19) is fixed to the holder (I7) with a bolt (20).

A turret stand (21) is fixed to the rear right side of the bed (1). A disk-shaped turret head (22) is attached to the front surface of the turret stand (21) so that its axis is parallel to the X-axis, and is rotated about this axis by an appropriate drive device (not shown). As shown in detail in Fig. 8, three grindstone heads (
23) (24) (25) and one workpiece size measuring device (26) are installed. Each whetstone head (23) (
24) (25) is a grinding wheel (27) (28) (
29) and a drive device for rotationally driving this (path shown)
It is equipped with The measuring device (26) includes a dimension measuring probe (30). The dimension measurement probe (30) is a well-known omnidirectional high-precision limit switch (touch sensor) used for measuring the distance between two points, etc., and when the spherical measurement part (30a) at the tip comes into contact with the fixed object. It sometimes issues a signal and reads the position of a moving object such as a table at that time to determine the position.

For example, the first grindstone (27) is for the outer diameter and end face, the second grindstone (28) is for the inner diameter, and the third grindstone (29) is for the raceway groove. The whetstone head (23) (24) (25) and the measuring device (26) are sequentially positioned at the lower left working position by the rotation of the turret head (22), and when they come to this working position, the whetstone (27) (28> (29) and probe (30) protrude to the left in parallel with the two axes.In addition, each grindstone head (23) (24) (25)
The center height of the grindstone (27) (2g) (29) is adjusted so that when it comes to the working position, its axis is parallel to and approximately the same height as the axis of the chuck (9). Also, on the right side of the turret stand (21), there is a whetstone stand (23) (24
) A grindstone measuring device (31) is provided for measuring the dimensions of the grindstones (27), (28), and (29) when the wheels (2!5) come to the upper right measurement position symmetrical to the working position.

This measuring device (31) determines the CI of the dimensions of the grindstone (27) (2g) (29) using a known image processing method, and uses a light source device (3) attached to a frame (32).
, 3) and a light receiving camera (34).

Details of the workpiece size measuring device (26) are shown in Figures 9 to 11.
As shown in the figure. These drawings are 13 fixed devices (26)
Since this shows the state in which the measuring device (26) is in the working position, the configuration of the measuring device (26) will be explained below in this position.

The All mounting (2B) includes a case (3B) fixed to the turret head (22) with bolts (35). This case (3G) has an approximately semi-cylindrical shape with its axes parallel to the two axes and the front side removed, with an upper overhang (3Qa) that overhangs forward at the top, and an upper overhang (3Qa) that overhangs forward at the bottom. A lower overhang (aeb) is formed in each case. A substantially rectangular parallelepiped-shaped holder attachment block (37) is attached to the lower surface of the upper overhang (38a) inside the case (3B). The block (37) is formed with a slit (38) extending horizontally from the right end surface to near the left end surface, and then curved upward and extending to near the top end surface over the entire width of the front and rear. 37
) are the upper fixed part (37a) and the lower movable part (37b)
These are connected by a connecting portion (37e) with a small horizontal width at the upper left side. The fixed part (37a) is attached to the case (
36), and the movable portion (37b) can be slightly tilted about an axis parallel to the X-axis of the connecting portion (37c). A holder fixing hole (40) is formed in the front part of the movable part (37b) and passes through the movable part (37b) from side to side.
On the right side, there are escape holes (41) that are coaxial with this and have a slightly larger inner diameter than the fixed part (37a) and the movable part (37b).
). In addition, the movable part (3
An adjustment female screw (42) is formed on the right side of 7b) and passes through it vertically.

Holder fixing hole (40) and escape hole (4) of block (37)
1), a cylindrical probe holder (43) elongated from side to side
is inserted through the left and right sides, and the flange part (43
It is fixed by a bolt (44) passed through a).

The holder (43) fits tightly into the fixing hole (40) and passes through the escape hole (4I) with a gap.

A plate-shaped lid (45) is fixed to the front surface of the case (36) with bolts (4G). On the left end surface of the case (3B), a notched disk-shaped end plate (47) is attached to the bolt (4).
8), and a holder (43) passes through a hole (49) formed in this with a gap. A holder (43) protrudes from this plate (47) to the left side.
A measurement probe (30) is fixed to the tip of the probe.

A screw insertion hole (5o) is formed in the right side of the lower projecting part (36b) of the case (36) to vertically pass through the lower projecting part (36b),
A screw holder (51) is placed above this hole (50) with a bolt (
52). A slit (53) located above the hole (50) is formed in the screw holder (51), and an adjustment screw (53) is formed in the hole (50) and slit (53).
54) has been inserted. A flange part (54a) located above the holder (51) and a flange part (54b) located below are formed in the middle of the adjustment screw (54), so that the adjustment screw (54) hardly moves up or down. It has become. A male thread (54'e) is formed at the upper end of the adjustment screw (54), and this is screwed into the female thread (42) of the block (37).

By rotating the adjustment screw (54), the block (
The inclination of the movable part (37b) of 37) changes, thereby changing the vertical position of the spherical measuring part (30a) at the tip of the probe (30). Then, adjust the adjustment screw (
54) adjusts the center height of the probe (30).

A center height setting block (55) is fixed to the upper right portion of the two-axis table (2). Note that the center height adjustment of the probe (30) using this block (55) will be described later.

As shown in FIG. 12, the grinding device is equipped with a numerical control device (NC device) (5B) that controls the entire device. This NC device (56) is equipped with a microcomputer (CNC device), and contains the material dimensions and finished dimensions of the workpiece (W), the machining process, and the grindstone (27) (2
8) A keyboard (57) and CRT display (58) are connected for setting dimensions, processing conditions, dressing conditions, etc. of (29) and probe (30). Based on these setting conditions, the NC device (5B)
Headstock (6), turret head (22), 2-axis table (2), X-axis table (3), grindstone measuring device (31)
, the dressing device (7), etc. Then, the grindstones (27) (28) (
Depending on the dimensions and setting conditions of the grinding wheels (27) (28)
) After dressing (29) and grinding the workpiece (W), the workpiece (W) was measured with the workpiece measuring device (2B).
Correct the X-axis and two axes based on the machining dimensions of W).

Next, the operation of each part of the above grinding device will be explained.

When measuring the dimensions of the grindstone (27) (28) (29), first measure the size of the grindstone (27) (28) (29).
9) at the measurement position. As a result, the grindstone (27
) (28) (29) Since it is located between the light source device (33) and the light receiving camera (34) of the grinding wheel measuring device (31), the grinding wheel measuring device (31) comes out from the light source device (33) and measures the grinding wheel ( 27) (28) The light passing through the parts (29) is received by the light-receiving camera (34), and the brightness data is image-processed to determine the outer diameter (X-axis data), the length and the position of the end face from the two-axis reference position (two-axis data). Note that these measurement data are stored in the NC device (56). The grindstone measuring device (31) is also used to check whether a grindstone of a specified size is attached to each position of the turret head (22).

When dressing the grinding wheels (27) (28) (29), first
9) in the working position, and move the two-axis table (2) and Move the axis table (3) in rapid traverse. Then, the grinding wheels (27), (28), and (29) are gradually brought closer to the diamond (19), and the three axes of the X-axis, 2-axis, and C-axis are simultaneously controlled based on the setting conditions. ) (28) Modify (29) into the desired shape.

First, what are the dimensions of the whetstones (27), (28), and (29)? When the IDJ is set, the accuracy of the X-axis data and 2-axis data is generally about 0.01 to 0.1m+*, which is often lower than the accuracy required for grinding, so the grinding wheel (2
7) In order to prevent the (28) (29) from colliding with the diamond (19), the gap when the grinding wheel (27) (2g) (29) is brought close to the diamond (19) in rapid traverse should be adjusted to avoid inaccuracies in the dimension measurement. The X-axis and 2-axis positions of the dressing device (7) at the time of dressing completion are read in, for example, 0.001 am units, the X-axis data and the 2-axis data are corrected, and this is used for the new grindstone X-axis data and 2-axis data. From next time onwards, reduce the gap during fast forwarding.

When grinding the workpiece (W), first, with the target grindstone (27) (28) (29) located at the working position, the workpiece (W) and the grindstone (27) (28)
(29) until there is a slight gap between 2
Move the axis table (2) and the X-axis table (3) in rapid traverse. And the whetstone (27) (28) (29)
gradually approach the workpiece (ν), and control the two axes, the X-axis and the 2-axis, based on the setting conditions and the X-axis data and 2-axis data of the grindstone (27), (28), and (29) dimensions. The workpiece (W) is ground to desired dimensions.

The measurement of the machining dimensions of the workpiece (ν) is based on the workpiece dimension flll
With the J-setting device (26) in the working position, the following procedure is carried out (see FIG. 4). When measuring the outer diameter, place the spherical measuring part (30a) at the tip of the probe (30) on the outer surface of the workpiece (W) from the front, read the X-axis coordinate value at that time, and then Apply the measuring part (30a) to the outer surface of the workpiece (W) from the rear side, read the X-axis coordinate value at that time, and calculate the outer diameter from the difference between these and the diameter of the spherical measuring part (30a). demand. When measuring the inner diameter, apply the spherical measuring part (30a) to the inner surface of the workpiece (W) from the rear side, read the X-axis coordinate value at that time, and then
Apply the lJ fixed part (30a) to the inner surface of the workpiece (W) from the front, read the X-axis coordinate value at that time, and calculate the inner diameter from the sum of these differences and the diameter of the spherical measuring part (30a). .

Prior to measuring the length (end surface position) of the workpiece (ν), with the workpiece (W) not attached to the chuck (9), apply the spherical measuring part (30a) to the reference surface (9a), After reading the two-axis coordinate values at that time, place the spherical measuring part (30a) on the end face of the chuck (9), read the two-axis coordinate values at that time, and use the difference between them to determine the distance from the reference surface (9a). The protrusion amount of the chuck (9) in the biaxial direction (chuck protrusion amount) (
Measure C) and memorize it. When determining the length of the workpiece (W) by 7]11, first place the spherical measuring part (30a) on the reference surface (9a), read the two-axis coordinate values at that time, and then measure the spherical 71111. The fixed part (30a) is connected to the workpiece (w
), read the two-axis coordinate values at that time, and find the length from the difference between these (L) and the chuck protrusion amount (C).

When measuring the length of the workpiece (W), generally, the spherical measuring part (30a) is applied to the end face of the chuck (9) in advance.
Measure the chuck end face position and memorize it, then apply the spherical measuring part (30a) to the end face of the workpiece (W) and measure the difference between the two-axis coordinate value and the chuck end face position at this time. It is conceivable to take the length of the workpiece (ν) to be the length of the workpiece (ν). However, when doing this, the main shaft (8
), the measurement value will be inaccurate.

On the other hand, in the case of the above embodiment, the reference surface (9a) is fixed at n1 each time a measurement is made, and the difference between the measured value of the end face of the workpiece (W) and the measured value of this reference surface (9a) is Since the length is determined based on this, the measured value is accurate even if there is thermal displacement.

Furthermore, when measuring the outer diameter of the workpiece (W), a measurement error will occur if the center height of the spherical measuring part (30a) does not match the height of the axis of the workpiece (+d).

Therefore, the center height of the spherical measuring section (30a) is adjusted as follows. That is, first, a workpiece whose outer diameter is known is attached to the chuck (9), and its outer diameter is measured. Then, the center height of the probe (30) is adjusted so that this measured value is equal to the actual outer diameter. After adjusting the center height of the probe (30) at the working position in this way, the measuring device (26) is moved to the turret head (22).
) with the two-axis table (
2) to block the spherical measurement part (30a) (
55), and the position of the 92-axis table (2) at that time is stored as a probe setting value. Then, when replacing the probe (30) from now on, the two-axis table (2) is moved with the measuring device (26) positioned at the set position at the lower right of the turret head (22), and the spherical measuring part (30) is moved.
a) into contact with the block (55), and adjust the spherical measuring part (3) using the adjustment screw (54) so that the position of the two-piece table (2) at that time is equal to the memorized probe setting value.
The center height can be easily adjusted by simply adjusting the position of 0a).

In the above-mentioned grinding device, grinding is automatically performed by simply setting various conditions in the NC device.

Next, taking as an example the case of machining a workpiece (W) as shown in Fig. 13, that is, the inner ring of a ball bearing, we will explain one of the operations of the grinding device.
Explain an example.

First, the reference end face (Wa) of the first workpiece (W) is held by the chuck (9). In addition, this reference end face (Wa)
For this, the end face is processed in advance in the same way as the end face described below using the same grinding device, or processed in the same way as conventionally using another grinder or the like.

Then, the first grindstone (27) for the outer diameter and end face is positioned at the working position, and the outer diameter and end face are dressed using the dressing device (7). Next, this whetstone (27
) to grind the outer diameter (Wb) of the workpiece (W) to the final finishing dimension plus the final machining allowance. ) to the final finish size plus the final machining allowance. Next, place the workpiece measuring device (26) at the working position and measure the outer diameter and length (end surface) of the workpiece (V).
νC) position). Then, again the first whetstone (2
7) at the working position, and in consideration of the above measurement results, perform outer diameter finishing processing to grind the outer diameter (Wb) so that the outer diameter matches the final finished dimension, and then adjust the length to the final finished dimension. An end face finishing process is performed to process the end face (We) in consideration of the measurement results so that the dimensions are met. Next, the workpiece measuring device (2
B) in the working position and measure the outer diameter and length of the workpiece (w). Then, finishing processing and dimension measurement are repeated while making corrections based on the measurement results until the measurement results fall within a preset finishing dimension range.

After finishing the finishing process, turn on the third grindstone (2) for the raceway groove.
9) in the working position and dress its outer diameter using the dressing device (7). Next, use this grindstone (29) to groove the outer diameter of the workpiece (w).
Perform raceway groove machining to grind Wd). When the raceway groove machining is completed, the second grindstone (28) for the inner diameter is positioned at the working position, and the outer diameter is dressed using the dressing device (7). Next, this grindstone (28) is used to perform inner diameter intermediate processing in which the inner diameter (We) of the workpiece (V) is ground to a dimension equal to the final finished dimension plus the final machining allowance. Next, the workpiece measuring device (2B) is positioned at the working position to measure the inner diameter of the workpiece (W). Then, the second grindstone (28) is placed in the working position again, and in consideration of the above measurement results, an inner diameter finishing process is performed to grind the inner diameter so that the inner diameter has the final finishing dimension. Next, the workpiece measuring device (2G) is positioned at the work position to measure the inner diameter of the workpiece (v). Then, the finishing process and dimension 1111 determination are repeated while making corrections based on the measurement results until the measurement results fall within a preset finishing dimension range.

When the finishing machining is completed, the workpiece (W) is taken out and the next workpiece (w) is machined.

The dimensions of the processed workpiece (W) taken out from the grinding device are determined by ri11 outside the machine, and if the dimensions are not within a predetermined range, the data in the NC device (5B) is corrected.

For the second and subsequent workpieces, if the difference between the machining dimensions and the command value is less than the predetermined value as a result of the previous finishing machining, the workpieces will be processed in one go without performing intermediate machining. The finishing process is carried out to shorten the machining time.In addition, dressing does not need to be performed every time machining is performed, but is performed when a new grindstone is attached to the shaft, and as needed depending on the amount of machining and required machining accuracy. .

Note that the purpose of performing intermediate processing is to avoid producing defective products due to excessive grinding amount, and if high precision is not required, this step may be omitted.

In the above grinding device, as mentioned above, the turret head (
22) and whirl the whetstones (27) (28) (29).
), multi-step machining can be performed with one chucking, high-precision machining is possible, and efficiency is high.

Since the center axis of rotation of the turret head (22) is perpendicular to the axis of the workpiece (w), the direction of rotation of the turret head (22) is tangential to the workpiece (W), and the turret head (22) rotates. Even if positional variation occurs in the turning direction, this positional variation will be in the tangential direction of the workpiece (ν). For this reason, the turret head (22) in the radial direction of the workpiece (W) affects the machining accuracy of the workpiece (W).
The positional variation is small and the machining accuracy is good.

In addition, the turret head (facing the front side, that is, the operator side)
Since the grinding wheel head (23) (24) (25) and workpiece measuring device (2B) are attached to the front of the turret head (22), these can be easily replaced without rotating the turret head (22). It is possible and has good workability.

Furthermore, since the turret base (21), which is inevitably heavy, is fixed to the bed (1), the kinetic energy is small, and the light headstock (6) is moved in the X-axis direction and the z Id+ direction, making positioning High accuracy and high precision processing is possible.

Since the grinding wheel measuring device (31) is provided, the grinding wheel (2
7) Automatically measure the dimensions of (2g) (29),
Based on this, dressing of the grinding wheels (27), (2g), and (29) and processing of the workpiece (ν) can be performed, and there is no need to enter troublesome data.

Since the dressing device (7) is equipped with a diamond (19) that moves in the X- and Z-axis directions and rotates around the C-axis perpendicular to these, by controlling these three axes simultaneously, Whetstone (27) (28) (29)
can be dressed in the desired shape. Further, both upper and lower ends of the rotating member (15) to which the holder (17) of the diamond (19) is attached are connected to the rotating axis (la) (14).
), it has a both-end support mechanism supported by bearings, so it has high rigidity, low thermal displacement, and allows for highly accurate dressing.

The dimension measuring device (26) on the grinding device automatically measures the dimensions of the workpiece (W) during and at the end of machining, and continues machining while comparing with the required finished dimensions. You can ensure stable finished dimensions without producing defective products.

Effects of the Invention According to the multi-step grinding device of the present invention, as described above, 1.
Multi-step machining can be performed by chucking once, resulting in high machining accuracy and high machining efficiency.

In addition, position variations due to rotation of the turret head have little effect on workpiece machining accuracy, resulting in good machining accuracy.

Furthermore, since the light headstock moves without moving the heavy turret head, less kinetic energy is required, and positioning accuracy is high, allowing for highly accurate machining.

Workpiece size 4-1 By correcting the dimensions during grinding based on the measurement results of the workpiece size using the fixing device,
Stable finished dimensions can be ensured without producing defective products.

By providing the grindstone 8-1 constant device, it is no longer necessary to enter troublesome data regarding the grindstone dimensions, and the grindstone DI
By dressing the grinding wheel and grinding the workpiece based on the results of measuring the dimensions of the grinding wheel using a fixed device, it is possible to prevent the grinding wheel from colliding with the dressing device or the workpiece, and to achieve efficient dressing and grinding. can.

In addition, it is possible to check whether a grindstone of a set size is attached to each position of the turret head.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a multi-step grinding device showing one embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the same, and FIG.
The figure is a partially cutaway plan view of the chuck part, Figure m5 is a front view of the dressing device part, Figure 6 is a view taken along the line Vl-Vl in Figure 5, and Figure 7 is Figure 6 - ■. 8 is a front view of the turret section, FIG. 9 is a partially cutaway front view of the workpiece measuring device, and FIG. 10 is a sectional view taken along line XX in FIG. FIG. 11 is a sectional view taken along the line XX in FIG. 9, FIG. 12 is a block diagram showing the electrical configuration of the multi-step grinding device, and FIG. 13 is a horizontal sectional view showing an example of a workpiece. (3)...X-axis table (headstock table), (6)
... Headstock, (7) ... Dressing device, (21) ...
・Turret stand, (22) ... Turret head, (26
)... Workpiece size Jllll determination device, (27) (2g)
(29)...Whetstone, (31)...Whetstone measuring device,
(56)... Numerical control device, (W)... Workpiece. Above Figure 4 Figure 11 Figure 13

Claims (4)

[Claims] (1) a headstock for holding and rotating a workpiece; a headstock table on which the headstock is placed and moved in a first horizontal direction parallel to the axis of the workpiece and a second horizontal direction perpendicular thereto; a turret head that is rotated about an axis parallel to a second horizontal direction and to which a plurality of grinding wheels are attached; and a numerical control device that controls movement of the headstock table in the first horizontal direction and the second horizontal direction by numerical commands. A multi-process grinding device characterized by: (2) A plurality of grinding wheels and a workpiece size measuring device are attached to the turret head, and dimension correction is performed during grinding based on the measurement results of the workpiece size by the workpiece size measuring device. The multi-step grinding device according to claim (1). (3) A dressing device is installed on the headstock table, and a grindstone measurement device is installed on the turret table to which the turret head is attached, which uses image processing to measure the dimensions of the grindstone that has rotated to a predetermined position. A claim characterized in that the dressing of the grindstone and the grinding of the workpiece are performed based on the measurement results of the grindstone dimensions by the device.
1) Multi-process grinding equipment. (4) The multi-step grinding apparatus according to claim (3), characterized in that a grindstone measuring device checks whether or not a grindstone of a set size is attached to each position of the turret head.