JPH06143109A - Cylindrical grinder - Google Patents

Abstract

(57) [Summary] [Purpose] The sliding surface of the machine base extends over the range of movement of the table so that the table does not protrude from the sliding surface of the machine base in a table moving type grinder. When the lengths of the workpieces are different, the range of movement of the table expands and contracts by twice the difference. Therefore, the left and right lengths of the machine base have to be largely changed, and many models have different center-to-center distances. [Structure] The work headstock 3 and tailstock 4 are fixed in front of the machine base 5 so that the inter-center distance can be adjusted. Saddles 24, 25 are provided on the side opposite to the machine base 5 so as to be driven in the left-right direction, and the grindstone base 3 is mounted on the saddles 24, 25 so as to be driven in the front-back direction.
6, 37 are provided. The lateral movement of the saddles 24 and 25 is small, and the machine base 5 can be adapted to a wide range of the length of the workpiece W even if the lateral length is constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical grinder, and more particularly to a grinder mainly suitable for grinding both ends of a workpiece.

[0002]

2. Description of the Related Art Conventionally, for example, when grinding reduced-diameter grinding parts W1 and W2 at both ends of a workpiece W shown in FIG. 13, first grind the grinding part W1 with a grindstone 1 and then move the table 2 leftward. Then, the grinding portion W2 is ground. In the case of grinding by plunge cutting, the leftward travel distance of the table 2 is LO + F, which is the length LO of the intermediate large diameter portion of the workpiece W plus the width F of the grindstone 1.
Further, when the workpiece W is fed leftward and rightward for grinding, the rightward traveling distance of the table 2 is slightly larger than LO + F. When the lengths of the grinding portions W1 and W2 of the workpiece W are L1 and L2, the total length of the workpiece L = LO + L1 + L2. If the distances between the rear ends of the work spindle 3 and the tailstock 4 supporting the work W and the end of the work W are LH and LT, respectively, with respect to the maximum work length LMAX of the cylindrical grinder, Therefore, in order to perform the above processing, the table 2 must move at least LMAX + F, so the length LB of the machine base 5 in the left-right direction is LMAX + L.
H + LT + LMAX + F = 2LMAX + LH + LT + F
Becomes Here, ignoring the width F of the grindstone 1 and setting LH + LT = constant value = C, LB = 2LMAX + C. In the above description, the grinding oil recovery groove and the like provided outside the movement limit position of the table 2 of the machine base 5 are excluded. However, this is also considered to be constant even if the table stroke changes with a grinder that matches the diameter of the grinding portion. = 2LMAX + C. As is clear from this equation, the length of the machine base 5 in the left-right direction changes with a multiplier 2 as the length of the workpiece W increases or decreases. Therefore, when the length of the workpiece W is different, it is usual to use various types of grinding machines having different sizes for the table 2 and the machine base 5.

[0003]

As described above, in the case of the table-moving type cylindrical grinder, a plurality of grinders are usually used in order to adapt to the length of the workpiece. Therefore, the machine stand, the table,
Since the table feeders are different from each other, not only the manufacturing cost is significantly increased, but also the number of manufacturing days is long, which complicates the process control. In such a table moving type grinder, the machine base left-right length LB is the work W.
Since the influence of the length L of the machine doubles and increases, the machine base becomes large, and in particular, when the length L of the workpiece W increases, the lateral length of the machine base increases significantly.

Therefore, it is conceivable to fix the work piece and feed the grindstone head in the longitudinal direction of the work piece like a certain type of bed way grinder which is a kind of special surface grinder. To be Since a cylindrical grindstone is used to grind the step end surfaces WE1 and WE2 formed between the large-diameter portion and the grind processing portions W1 and W2 of the workpiece by the grinding method described in FIG. When repairing, repairing both sides of the cylindrical grindstone is extremely time consuming. Therefore, if an angular grindstone is used, the workpiece headstock 3 side or tailstock 4 side
Either side of the end faces WE1 or WE2 of the grind processing portions W1 and W2 can be ground, but the other side cannot be ground. Therefore, the workpiece W is removed from the workpiece headstock and the tailstock, and the workpiece W is supported so that the grinding portion W1 side is supported by the workpiece spindle and the grinding portion W2 side is supported by the tailstock side. You will have to change your position.

It is an object of the present invention to provide a cylindrical grinding machine which can shorten the length in the left-right direction of the machine, can be adapted to long and short workpieces, and can effectively machine both ends of the workpiece. .

In addition to the above objects, it is an object of the present invention to provide a cylindrical grinder capable of grinding the intermediate portion of a workpiece.

[0007]

A first aspect of the present invention is a work spindle provided on the front side of the machine stand as seen from the operator side so that the intervals can be adjusted by aligning the axial centers on the same center line in the left-right direction. A platform and a tailstock, and saddles to the left and right, which are movably arranged on the machine base in a direction opposite to the workpiece headstock and the tailstock when viewed from the operator side, respectively so as to be movable in parallel with each other. A horizontal feed device that drives each of these saddles, and a grindstone stand that is movable in the front-rear direction on these saddles so that different positions of the workpiece supported by the workpiece headstock and tailstock can be ground. A cylindrical grinding machine including a cutting feed device for driving each of these grindstone bases and a machine base.

A second invention of the present invention is the cylindrical grinding machine according to the first invention, characterized in that the grindstones provided on the two grindstone bases are provided on the same side with respect to the left and right sides of the grindstone base body. .

According to a third aspect of the present invention, in the cylindrical grinding machine according to the first aspect of the invention, the grindstones provided on the two grindstone bases are provided on different sides with respect to the left and right sides of the main body of the grindstone. is there.

According to a fourth aspect of the present invention, each saddle and a saddle feed device are arranged so that at least one of the wheel heads can withdraw the other wheel head so that it can grind an intermediate portion of the workpiece. The cylindrical grinding machine according to any one of the first to third inventions, characterized in that

A fifth invention of the present invention is the cylindrical grinding machine according to any one of the first to fourth inventions, wherein the grindstone base is provided so as to be movable left and right on the saddle. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIGS. 1, 2 and 3 show three views of the embodiment. FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a side view. FIG. 4 is the above perspective view.

A work headstock 3 and a tailstock 4 are provided on the machine base 5 and the front side as viewed from the operator side so that the axes can be aligned on the same center line in the left-right direction and the intervals can be adjusted. Figure 5 is the machine base,
It is a front view which shows a workpiece headstock and a tailstock part. Since the work headstock 3 and the tailstock 4 are provided as described above, the table base 6 elongated in the left-right direction is provided on the machine base 5 at a slight angle about the pin shaft 7 perpendicular to the machine base 5 in the horizontal plane. A work headstock table 9 having a dovetail guide 8 in the left-right direction on its upper surface is fixed to the table base 6 so as to be rotatable. A guide in the left-right direction is provided on the table base 6, and a tailstock table 11 is slidably engaged with the guide in the left-right direction. A dovetail-shaped guide 12 is provided on the upper surface of the tailstock table 11. The feed screw 14 screwed into the nut 13 fixed to the tailstock table 11 is supported on the table base 6 by the bearing 10 on the tailstock side, and the motor shaft of the motor 15 fixed to the table base 6 is attached to the shaft joint 16 by a shaft coupling 16. It is connected. The workpiece headstock 3 is slidably engaged with the dovetail-shaped guide 8 on the workpiece headstock table 9, and an adjusting screw 18 is screwed into a nut 17 fixed to the workpiece headstock 3. The adjusting screw 18 is supported by a bearing 19 fixed to the workpiece headstock table 9 so as not to move in the axial direction. By fitting a handle to a tool handle (not shown) at the end of the adjusting screw 18 and rotating the handle, the position of the work headstock 3 can be adjusted with respect to the work headstock table 9. The tailstock 4 slides on the dovetail-shaped guide 12 on the tailstock table 11, and an adjusting screw 22 is screwed into a nut 21 fixed to the tailstock 4. Adjustment screw 2
2 is supported by a bearing 23 fixed to the tailstock table 11 so as not to move in the axial direction. The position of the tailstock 4 can be adjusted with respect to the tailstock table 11 by fitting and rotating a handle on a tool handle (not shown) at the end of the adjusting screw 22.

When the motor 15 is rotated, the feed screw 14 is rotated via the shaft coupling 16 and the nut 13 is fed, so that the tailstock table 11 is moved. Thereby, the distance between the work headstock 3 and the tailstock 4 can be changed. Adjusting screw 18
The position of the workpiece headstock 3 can be adjusted with respect to the workpiece headstock table 9 by rotating, and the adjusting screw 22 is rotated to move the tailstock 4 of the tailstock table 4 with respect to the tailstock table 11. You can adjust the position. Therefore, the space between the work headstock 3 and the tailstock 4 can be adjusted in a wide range, and the space between the workstock headstock 3 and the tailstock 4 is kept the same in the normal use range. Object headstock 3 and tailstock 4
Can be moved left and right respectively.

When viewed from the operator's side, the left and right sides of the workpiece headstock 3 and the tailstock 4 are movable in parallel to the center lines of the workpiece headstock 3 and the tailstock 4, respectively, on the side opposite to the workpiece headstock 3 and the tailstock 4. Saddle 2 for one
4, 25 are provided. As shown in the plan view of FIG. 6 and the vertical sectional view of FIG. 7, a linear guide surface 26 parallel to the center lines of the work headstock 3 and the tailstock 4 is provided on the machine base 5, and the guide surface 26 is provided. The saddles 24 and 25 are movably fitted to each other.

Left and right feeding devices 27 and 28 for driving the saddles 24 and 25, respectively, are provided. Since these feeders have the same structure and are different only in the arrangement position and the direction, the feeder 27 will be described. As shown in FIG. 7, a feed screw 31 is screwed into a feed nut 29 fixed below the saddle 24. The feed screw 31 is supported by bearings 32 and 33 fixed to the machine base 5, and is connected to a servomotor 34 fixed to the machine base 5 by a shaft joint 35. The feed screws 31 of the respective feed devices 27, 28 of the saddles 24, 25 are different from each other as shown in FIG. 6, so that the distance LS between the rear ends of the servomotors 34 on both sides is shortened and the saddle 24, The moving range of 25 is enlarged.

The saddle 24, which enables grinding of different positions of the workpiece W supported by the workpiece headstock 3 and the tailstock 4,
Grinding stone bases 36 and 37 are provided on the 25 so as to be movable in the front-rear direction. FIG. 7 shows the case where the grindstone shaft is parallel to the center lines of the work headstock 3 and the tailstock 4, but normally, as shown in FIG. 1, the grindstone shaft centerlines 39 and 41 are slanted. is there. Figure 7
As shown in FIG. 5, slide bases 42 and 43 are fixed on the saddles 24 and 25, respectively, and wheel head slides 46 and 47 are movably fitted to guide surfaces 44 in the front-rear direction on the slide bases 42 and 43. . Main bodies 48 and 49 of the grinding wheel bases 36 and 37 are fixed on the grinding wheel base slides 46 and 47 so as to adjust their positions by rotating around the pin shaft 70 (see FIG. 8).

Cutting feed devices 51 and 52 for driving the grindstone bases 36 and 37 are provided. Cutting feed device 51,
Reference numeral 52 has the same configuration, and only the cutting feed device 51 will be described. As shown in FIG. 8, a feed nut 53 is fixed to the lower surface of the grindstone slide 46, and a feed screw 54 is screwed into the nut 53. The feed screw 54 is supported by bearings 55 and 56 fixed to the slide base 42 (43). The servomotor 57 or 58 fixed to the slide base 42 (43) and the feed screw 54 are connected by a shaft joint 59.

The grindstone bases 36 and 37 are similar to those of an ordinary cylindrical grinder, and grindstones 62 and 63 are attached to grindstone shafts 61 rotatably supported by the grindstone base bodies 48 and 49, respectively. In the grindstone shaft 61, a belt 68 is wound between a pulley 64 fixed to the rear end of the grindstone shaft 61 and pulleys 67 at the ends of the motors 65 and 66 mounted on the grindstone base bodies 48 and 49.

In the above, the grindstones 62 and 63 are arranged on the left side of the grindstone bases 48 and 49 as viewed from the operator side, and are angular grindstones.

As shown in FIG. 9, the grindstones 36, 37 are moved farthest from each other and the motor 15 on the tailstock 4 side is rotated to move the tailstock 5 away from the work head stock 3.
Contrary to the above-described workpiece W having a length LMAX shown in (A), the grindstone base 36 is located at the same position, and the grindstone bases 36, 37 are brought closest to each other to rotate the motor 15 on the tailstock 4 side to rotate the tailstock 4. Is brought close to the workpiece headstock 3 to process a workpiece having a length LMIN shown in FIG. 9 (B). For example, LMAX = 1800 millimeters LMIN = 1400 millimeters. FIG. 9 (A),
In the present example, the workpiece W of (B) is to grind the journal portions WJ at both ends and the end surface WE of the step on the larger diameter side than the journal portion WJ. Conventionally, in order to machine such large and small workpieces W, one table carrying the workpiece headstock and tailstock is moved to the left and right to be positioned, and the journal portion WJ and the end surface WE on the tailstock side are moved by the angular grindstone. Plunge cut or feed in the left-right direction to grind, and then invert the workpiece W by 180 degrees to rotate the journal WJ and end face W on the other side.
Since E is ground similarly, it takes time to change the setup.
In addition, the table movement range is the difference in the length of the workpiece W LMAX-
Since it changes over twice as much as LMIN, it was necessary to use two types of grinding machines with different center distances as the machine.
In the present invention, the LMAX workpiece W having a large length is mounted between the workpiece headstock 3 and the tailstock 4 in the above description, and the respective grindstones 62 and 63 are combined with the feed devices 27 and 51 and 28 and 52. The movements of the grindstones 62 and 63 are controlled by two-axis numerical control. Therefore, in this case, it is sufficient for the grinding wheel base 37 on the tailstock side to move by 400 mm, which is the difference between the maximum length LMAX and the minimum length LMAX of the workpiece W. Therefore, the length of the machine base 5 can be small. The end of the workpiece W, which is the journal WJ, is ground by plunge cutting or traverse feed,
When the journal portion WJ is a plunge cut, it is ground by giving a radial feed to the base of a constant cut. If the journal WJ is ground by traverse feed, the end surface WE
Can be ground by plunge cutting.

[Embodiment 2] In this embodiment, the large-diameter cylindrical portion at the center of the workpiece W can be ground at the same time. In order to move the saddle 24 to the left, a slight extension is provided on the machine base 5 to slightly extend the guide surface 26 (FIG. 6) to the left.
When the right end of the grindstone 36 is positioned to the left of the left end of the workpiece W as shown in FIG. 5, and the saddle 25 carrying the right grindstone 37 is moved to the left, the grindstone 63 moves to the center of the workpiece W. Since it reaches the left end of the large-diameter portion, it is possible to machine the large-diameter portion in the center of the workpiece by traverse feed. It is obvious that this embodiment can be applied to each embodiment described later.

[Embodiment 3] As shown in FIG. 11, the grindstones 62 and 63 are provided on the opposite sides of the grindstone base bodies 48 and 49.
Is provided, there is a step in the center, and it can be adapted to grind the end surface WE3.

[Embodiment 4] As shown in FIG. 12, a grindstone 6 is provided on the opposite sides of the grindstone bases 48, 49 opposite to each other.
By disposing 2, 63, the total length is long, and it is possible to adapt to grinding only short ends, and the left and right lengths on the rear side of the machine stand can be reduced. Therefore, the left and right overall length of the machine base is determined by the distance between the rear end of the work headstock and the rear end of the tailstock, and the total left and right length of the machine base is small.

In the embodiment, the grindstone bases 48, 49 are directly movable back and forth on the saddles 24, 25 and are screw-fed in the front-back direction. However, as shown in FIG.
25 is provided with a guide surface 71 in the left-right direction, and the guide surface 7
1, a slide 72 is provided so as to be movable in the left-right direction, the position of the slide 72 is adjusted so as to be fixed to the saddles 24, 25, and grindstone bases 48, 49 are provided on the slide 72 so as to be movable back and forth. The cutting feed devices 51 and 52 may be movable (not shown). Whetstone 6
The adjustment range of the horizontal positions of 2, 63 is large, and it is possible to adapt to various and various workpieces.

[0027]

According to the present invention, the work headstock and tailstock are arranged on the front side as viewed from the operator side, two grindstones are arranged on the opposite side, and two grindstones are arranged. Since the saddles provided so as to reciprocate in the left and right directions are provided movably in the front and rear direction and the feed devices for moving the saddle and the grindstone head are respectively provided, the lateral movement amount of the grindstone head is within the workpiece length L. The size of the machine base stays small in the left-right direction, and when the work piece is moved left and right as in the conventional table-moving type cylindrical grinder, it must be moved to the work piece length L to the left and right. Since the range becomes 2L and the machine base length in the left-right direction becomes long, it was necessary to prepare various grinders with different center distances for large and small workpieces. Can fit large and small workpieces, and at least both ends of the workpiece can be Wear can be processed in a single mounting without performing.

When the grindstones provided for the two grindstone heads are provided on the same side with respect to the left and right sides of the grindstone head main body, it is easy to retract one of the grindstone heads immediately after the work head stock, for example. Therefore, it is easy to grind a length close to the entire length of the workpiece by the other grindstone.

When the grindstones provided on the two grindstone bases may be provided on different sides with respect to the left and right sides of the grindstone base body, if the grindstones are provided on the opposite sides of the grindstone base body, the grinding portions at both ends of the workpiece are long. Suitable for cases. Also, if a grindstone is provided on the opposite side to the opposite side of the grindstone base body, the left and right width of the rear part of the machine stand becomes small when the length of the workpiece is very long and only the both ends are reduced, and the machine weight is reduced. In addition, the machine installation floor area is small.

When the grindstone is movable left and right on the saddle, in addition to the above effects, a wider range of workpieces can be accommodated.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side view of FIG.

4 is a perspective view of FIG. 1. FIG.

5 is a front view showing a portion of the work headstock and tailstock of FIG. 1. FIG.

FIG. 6 is a plan view showing a saddle feeding device.

FIG. 7 is a vertical sectional view showing a saddle feeder.

FIG. 8 is a vertical cross-sectional view showing a cutting feed device for a grinding wheel head.

9 (A) and 9 (B) are front views showing different workpieces.

FIG. 10 is a plan view of a second embodiment of the present invention.

FIG. 11 is a plan view of a third embodiment of the present invention.

FIG. 12 is a plan view of Embodiment 4 of the present invention.

FIG. 13 is a plan view of a table moving type cylindrical grinder.

[Explanation of symbols]

 1 Grindstone 2 Table 3 Workpiece headstock 4 Tailstock 5 Machine stand 24,25 Saddle 36,37 Grindstone stand

Claims (5)

[Claims] 1. A work headstock and tailstock, which are provided on the front side of the machine stand as viewed from the operator side so that the axes can be aligned on the same center line in the left-right direction and the intervals can be adjusted. The saddles to the left and right, which are movably arranged on the machine base on the side opposite to the work headstock and tailstock, respectively, in parallel with the center line, and left and right direction feed devices for respectively driving these saddles, Grindstone heads that can be moved back and forth on these saddles so that different positions of the workpieces supported by the workstock headstock and tailstock can be ground, and the cutting feed device that drives these grindstone heads, respectively. And a machine stand. 2. The cylindrical grinding machine according to claim 1, wherein the grindstones provided on the two grindstone bases are provided on the same side with respect to both lateral sides of the grindstone base body. 3. The cylindrical grinding machine according to claim 1, wherein the grindstones provided on the two grindstone bases are provided on different sides with respect to the left and right sides of the grindstone base body. 4. A saddle and a saddle feed device are provided so that at least one wheel head can grind an intermediate portion of a workpiece so that the other wheel head can be retracted. The cylindrical grinding machine according to any one of claims 1 to 3. 5. The cylindrical grinding machine according to claim 1, wherein the grindstone base is provided so as to be movable left and right on the saddle.