JPS63185561A - Noncircular type inner surface grinder - Google Patents

Abstract

PURPOSE:To judge the product working quality of a work speedily by supporting a spindle head through a swing means and arranging a means for swinging the spindle head to the position separating from a tool and arranging a measuring mechanism oppositely to a work positioned at the above-described position. CONSTITUTION:The noncircular inner wall part of a work W is ground by the action of all external cam-shaped master cam 52 and a touch roller. Then, a measuring mechanism (air micro 128, etc.) for judging if a prescribed grinding process for the workpiece W is achieved or not without demounting the workpiece W from a jig 50 is set. Therefore, the need of demounting the work once from the jig and conveying the work for the measuring mechanism arranged separately as in the conventional technique is avoided, and the product working quality of the work W can be judged speedily and in simple ways.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-circular internal grinding device, more specifically,
When performing non-circular internal grinding on the inner surface of the workpiece while rotating the workpiece, the workpiece side spindle is oscillated integrally with the workpiece to face the measurement mechanism, and this measurement mechanism applies the desired processing to the workpiece. The present invention relates to a non-circular internal grinding device that makes it possible to measure whether grinding has been performed.

BACKGROUND ART Various non-circular internal grinding devices have been used to grind a non-circular inner surface of a workpiece. A good example of this is machining the inner surface of an elliptical cylinder in an automobile engine. A conventional example of this type of non-circular internal grinding device is shown in FIG.

In this conventional example, a work setting jig 4 is displaceably provided on the upper surface of the machine stand 2, and a work spindle 6 is rotatably supported on the twenty jig 4. A spindle head 8 is provided at the tip of the work spindle 6, and a master cam 10 is attached to the tail end of the spindle head 8. A touch roller 12 attached to the upper part of the machine base 2 comes into contact with the internal cam surface of the master cam 10.

Therefore, the work spindle 6 rotates at a low speed under the rotational action of the belt 14, and as a result, the spindle head 8 is given a movement imitating the master cam IO that comes into contact with the touch roller 12, and is held by the spindle head 8. It is configured such that the inner surface of the workpiece W is ground by a rotary grindstone 16 that rotates at a fixed position.

In this case, the master cam 10 is constituted by an internal cam whose inner circumferential shape is selected to have a predetermined cam shape, and the touch roller 12 is inserted into and abutted within this internal cam.

However, in the conventional non-circular internal grinding device configured as described above, the spindle head 8 that holds the work W and the master cam lO are spaced apart from each other by a considerable distance at the tip and tail ends of the work spindle 6. As a result, the work spindle 6 becomes tilted due to a phase shift between the work W and the master cam IO due to torsion of the work spindle 6, or due to rattling of the spindle head 8, and the work W and the master cam 10 are Eccentricity tends to occur between the two. Furthermore, when inserting the touch roller 12 into the master cam 10,
Since this has to be supported cantilevered, touch roller 1
2, the support rigidity will be insufficient. As a result, the pressing force of the touch roller 12 against the master cam lO is weakened,
As a result, the workpiece W tends to be misaligned relative to the rotary grindstone 16.

That is, due to these various causes, the non-circular internal grinding apparatus according to the prior art has a problem in that the accuracy of grinding the workpiece W cannot be expected.

Moreover, the workpiece W attached to the spindle head 8
When inspecting whether or not the workpiece W has been sufficiently ground to the desired dimensions by the rotary grindstone 16, the workpiece W must be removed from the spindle head 8 and carried to a measuring device located at a different location. Furthermore, if the workpiece W does not have the desired dimensional accuracy, the workpiece W must be mounted on the spindle head 8 again and subjected to grinding.

As a result, when the workpiece W is mounted on the spindle spatula 1/8 again, positional deviation is likely to occur, resulting in the inconvenience that desired grinding accuracy is difficult to obtain. Of course, it has been pointed out that since the grinding process and workpiece measurement process are performed in separate locations, the production efficiency is low and it is not compatible with the current production process, which attempts to produce large quantities of products of the same quality. ing.

The present invention has been made in order to overcome the various disadvantages described above, and includes providing a workpiece mounting jig at the tip of the workpiece spindle, and disposing a master cam between the workpiece mounting jig and the spindle tip. A touch roller is attached so as to come into contact with the side of this master cam, while a measuring mechanism is placed close to the work spindle, and the work W which has been ground by the rotary grindstone is integrally attached to the work spindle. The structure is such that it can be swung to face the measuring mechanism and used to measure whether or not the workpiece W has a desired dimensional accuracy using a detector. It is an object of the present invention to provide a non-circular internal grinding device that can easily measure the presence or absence of abrasive particles on the same machine and further improve production efficiency.

In order to achieve the above object, the present invention rotatably provides a spindle head on which a workpiece mounting jig is attached on a machine stand, and a master cam that comes into contact with a touch roller is attached to this spindle head. A grinding device for grinding an inner surface of a workpiece held in the jig with a rotating tool by displacing the workpiece according to the master cam under the rotational action of a workpiece spindle, the spindle head being supported via a swing shaft; , a swinging means for swinging at least the spindle head from a first position where the workpiece faces the tool to a second position away from the tool; The present invention is characterized by providing a measuring mechanism facing the grinding inner surface of the workpiece.

Next, preferred embodiments of the non-circular internal grinding device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 20 indicates a machine, and this machine 2
0 has a rectangular parallelepiped shape and is supported by a plurality of legs 22. A plate 24 is arranged near one end on the upper surface of the 0 machine base 20, and a spindle drive motor is mounted on this plate 24. A speed reducer 628 that reduces the rotation speed of 26 within a predetermined range is fixed at 'R1. Reducer 28
A belt 34 is stretched around the output shaft 30 of. Further, a first bearing 32 is disposed on the plate 24, and a second bearing 32 is disposed on the plate 36 at a predetermined distance from the first bearing 32.
A bearing 38 is provided. A swing shaft 40 is bridged between the first bearing 32 and the second bearing 38, and a work spindle 42 is disposed on the swing shaft 40.

That is, a wide support 44 is pivotally supported on the swing shaft 40,
This column 44 rotatably supports the work spindle 42. A pulley 46 is fitted to one end of the work spindle 42, and the belt 34 is stretched around the pulley 46.

A spindle head 48 is provided at the other end of the work spindle 42, and a jig 50 is removably mounted on this spindle head 48. And this jig 5
A master cam 52 composed of an external cam is disposed between the spindle head 48 and the spindle head 48 .

As shown in FIG. 4, the spindle head 48 has a recess 5.
4 is formed, and a convex portion 5 of the master cam 52 is formed in this concave portion 54.
6 is fitted. The jig 50 is this master cam 52.
It is fixed to the housing via a plurality of mounting bolts 58. In this case, the master cam 52 is provided with a hole 64 into which the tip of the positioning pin 62 inserted through the hole 60 of the jig 50 fits. Note that the jig 50 is provided with a plurality of positioning pins 70 for positioning the workpiece W and a plurality of clampers 72 for fixing the workpiece W.

A cylinder rod 82 extending from a balance cylinder 80 is engaged with the support column 44 configured as described above. The balance cylinder 80 is swingably supported by a holder 84 erected on the plate 36, and the distal end of the cylinder rod 82 is connected to the column 44 via a connecting member 85 that is supported pivotally on the swing shaft 40. engage with. Therefore, when the balance cylinder 80 is energized, the column 44 and the work spindle 42 can swing together with the belt 34 via the swing shaft 40, as shown by the arrow in FIG. In this case, the balance cylinder 8 is centered around the swing shaft 40.
A Sizzic absorber 88 is provided on the 0 side, and its tip is provided opposite to an example part of the support column 44, and the plate 36
A stopper 90 is provided at a predetermined angle and is configured to restrict the amount of displacement when the support column 44 swings toward the opposite side of the balance cylinder 80.

Therefore, a touch roller 92 that comes into contact with the peripheral surface of the master cam 52 is provided on the side of the balance cylinder 80.

The touch roller 92 is supported at both ends by a pair of bearings 94 and 96, and the tip of a shaft 98 that rotatably supports the touch roller 92 from the bearings 96 is exposed to the outside.

Next, a plate 100 is disposed on the other end side of the machine stand 20. The plate 100 is provided with a motor 102 for correcting the grindstone position, and a ball screw (not shown) is connected to the rotating shaft of the motor 102 for correcting the grindstone position, and the tip of the ball screw has a surface portion inclined at a predetermined angle. A correction table 104 having the following information is provided. A wide rail member 106 engages with the inclined surface 104a of this correction table 104, and a slide table 108 is fixed to this rail member 106. That is, the upper part of the slide table 10B has rails 110a and 110.
b is arranged, and a cutting table 111 is arranged so as to be freely displaceable with respect to the rails 110a and 110b.
A cutting motor 112 is fixed to the slide table 10B.

A ball screw 113 is connected to the rotational drive shaft of this cutting motor 112, and when this ball screw 113 is screwed into the cutting table 111, the table
11 is moved so as to be freely displaceable on the rails 110a and 110b. A grindstone rotation motor 116 is further fixed to the cutting table 111, and a grindstone 120 is removably attached to the tip of a rotary drive shaft 11B of the grindstone rotation motor 116.

On the other hand, a measuring mechanism 121 is adjacent to the stopper 90 side. That is, a support body 122 is provided upright on the plate 100, and an air cylinder 124 is fixed to this support body 122. Cylinder rod 1 of air cylinder 124
26 has a plurality of air micros 12 that eject air at a predetermined pressure so as to correspond to the machining surface of the workpiece W.
8 is removably attached.

In the figure, reference numerals 130a and 130b are guide rods for accurately operating the cylinder rod 126 and the air micro 128 under the biasing action of the air cylinder 124.

The non-circular internal grinding device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, by driving the balance cylinder 80, the support column 44 is tilted toward the stopper 90 via the swing shaft 40. As a result, sufficient space is obtained on the work spindle 42 side, which allows the spindle head 4
8 is equipped with a master cam 52 and a jig 50 necessary for copying. At this time, the master cam 52 and the jig 50 are accurately positioned by inserting the positioning pin 62 into a hole 64 formed in the master cam 52. Therefore, the jig 5 positioned in this way
The work W is attached to 0. A positioning pin 70 is inserted into the workpiece W from the jig 50 side, and the workpiece W is firmly attached to the jig 50 via the clamper 72.

Therefore, the balance cylinder 80 is driven again and the support column 44 is
Return to the current position. At this time, when the column 44 is about to swing by a predetermined amount or more, the tip of the shock absorber 88 comes into contact with one surface of the column 44, thereby preventing further tilting movement. In this manner, the spindle head 48 is positioned via the balance cylinder 80. that time,
Needless to say, the touch roller 92 comes into contact with the peripheral surface of the master cam 52.

Therefore, when the spindle drive motor 26 is energized, its rotational force is reduced to a predetermined low rotational speed via the reducer 28, and the reduced rotational force is transmitted to the belt 34 via the output shaft 30. This causes the pulley 46 to rotate. As a result, the work spindle 4 that pivotally supports the pulley 46
2 rotates, and the master cam 5 comes into pressure contact with the touch roller 92.
The spindle head 48 is rotated following the shape of 2. On the other hand, the cutting motor 112 is driven, and the cutting table 111 displaces the grindstone 120 toward the workpiece W under the action of a ball screw (not shown).

During this time, if the grindstone rotation motor 116 is rotated at a predetermined rotation speed, the rotary drive shaft 118 will rotate the grindstone 120 at the desired rotation speed. Therefore, the grindstone 120 is finally placed facing the inner surface of the bore formed in the workpiece W.
Grind the inner surface. As a result, the workpiece W clamped to the jig 50 rotates slowly under the effect of copying rotation by the master cam 52, and the inner peripheral wall surface of the non-circular bore of the workpiece W is ground by the grindstone 120. reach.

By rotating the spindle drive motor 26 in this manner, the non-circular bore of the workpiece W is precisely ground.

By the way, after the workpiece W has been subjected to a predetermined grinding action, the cutting motor 112 is driven again, and the cutting table 11 is driven again.
1 returns to the current position. That is, the grindstone 120 will leave the workpiece W. Then, the balance cylinder 80 is driven again and the column 44 swings toward the stopper 90 side. As a result, the measuring mechanism 121 faces the work spindle 42 side held by the stopper 90. That is, as described above, the work spindle 4
2 is positioned toward the stopper 90 side, the air micro 128 at the tip of the cylinder rod 126 moves toward the workpiece W.
It will face the non-circular inner surface of. Therefore, when the air cylinder 124 is energized, the air micro 128 enters into the bore of the workpiece W.

Here, the air micro 128 is energized to supply pressurized air to the inner wall of the bore of the workpiece W at a predetermined pressure. As a result, if there is a difference beyond the allowable range between the pressure on the non-circular bore obtained in advance from the reference workpiece and the bore of the workpiece W machined this time, the workpiece W will need to be ground again. On the other hand, if the amount of grinding is within the allowable range, the workpiece W can be taken out of the jig 50 by relaxing the clamper 72, assuming that the workpiece W has the predetermined grinding quality. If information is obtained from the air micro 128 that the grinding has not been performed, the balance cylinder 80 is driven again to return to the current position, and the same grinding process as described above is restarted.

As described above, according to the present invention, after grinding the non-circular inner wall portion of the workpiece under the action of the master cam having an outer cam shape and the touch roller, the workpiece can be ground without being removed from the jig. It is possible to provide a measuring mechanism for determining whether a predetermined grinding process has been achieved. Therefore, as in the prior art, in particular,
Once the workpiece is removed from the jig, it is possible to easily and quickly determine whether the product processing quality of the workpiece is good or bad without having to transport the workpiece to a measuring mechanism located at a distance.

Moreover, if it is determined that the workpiece still needs to be subjected to the grinding process, the spindle head is returned to its current position under the swinging action of the balance cylinder without removing it from the jig. It is possible to perform the grinding process again.

Therefore, there is no need to remove the workpiece from the jig, perform subsequent measurements, and then attach the workpiece to the jig as in the prior art. Since no positional deviation occurs, the grinding process can be performed accurately. Moreover, since the grinding wheel used in this grinding process, the work spindle, the measuring mechanism, etc. are arranged on the machine stand, the area occupied is small, and therefore the space inside the factory etc. can be used more effectively. This has the effect of being promoted.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a non-circular internal grinding device according to the prior art, FIG. 2 is a perspective view of a non-circular internal grinding device according to the present invention, and FIG. 3 is a non-circular internal grinding device according to the present invention. FIG. 4 is a side explanatory view showing the arrangement of the master cam, balance cylinder, and shock absorber of the internal grinding device; FIG. The figure is a plan view of a non-circular internal grinding device according to the present invention, and FIG. 6 is a plan view illustrating a state in which the non-circular internal grinding device according to the present invention is being measured via a measuring mechanism after the grinding process is completed. FIG. 7 is a side view of the non-circular internal grinding device according to the present invention in a state of measuring a workpiece. 20...Machine stand 26...Spindle drive motor 28...Reducer 34...Belt 40...
・t=l moving shaft 42...work spindle 44...pillar 4B...spindle head 50...jig
52... Master cam 80... Balance Schilling 88... Shock absorber 90... Stopper 102... Grinding wheel position correction motor 104... Correction table 108... Slide table 111... Cutting table 112... Cutting motor 116... Grinding wheel rotation motor

Claims (3)

[Claims] (1) A spindle head with a workpiece mounting jig attached is rotatably provided on the machine base, a master cam that comes into contact with a touch roller is attached to this spindle head, and the spindle head is rotated under the rotational action of the workpiece spindle. In a grinding device that uses a rotating tool to displace the inner surface of a workpiece held in the jig by displacing it following a master cam, the spindle head is supported via a swing shaft, and at least this spindle head is supported by the tool when the workpiece is held by the jig. A swinging means is provided for swinging from a first position facing the tool to a second position spaced apart from the tool; A non-circular internal grinding device characterized by being provided with a facing measuring mechanism. (2) A non-circular internal grinding device according to claim 1, in which the measuring mechanism includes a cylinder and an air micrometer disposed at the tip of a cylinder rod constituting the cylinder. (3) In the device according to claim 1, the second
A non-circular internal grinding device that is configured to have a stopper located at a position to regulate the displacement movement of a swinging spindle head.