JP2000263393A - Grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding device which can grind the inside surface and outside surface of a work at a small constitution simply. SOLUTION: A grinding device 1 is provided with a work holding means 9a, 9b for holding and rotating a work W, an inner surface grinding wheel 51 for grinding the inside surface of the work, a spindle 47 for inner surface grinding mounting the inner surface grinding wheel 51, an outer surface grinding wheel 53 for grinding the outside surface of the work, a spindle 49 for outer surface grinding mounting the outer surface grinding wheel 53, a support plate 45 loading the spindle 47 for inner surface grinding and the spindle 49 for outer surface grinding integrally and provided turnably, a feed slide 39 mounting the support plate 45, a feed table 37 mounting the feed slide 39 and send out means 50, 41 for sending out the feed slide 39 and feed table 37 against the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding device for grinding a workpiece such as a precision part.

[0002]

2. Description of the Related Art In recent years, in a grinding apparatus for grinding a precision component used in a fuel injection device or the like, high precision is required for the grinding. In particular, with respect to shape accuracy, for example, coaxiality and squareness, there is a high demand for accuracy. For example, in grinding of an injection nozzle, the inner surface of a part (work) is ground (inner diameter processing), and then the outer surface of the part Is ground (outer shape processing), and further, the sheet portion of the nozzle is ground (sheet processing) and the like. The grinding is performed separately by changing the chucking of the work. Processing process is being performed. For this reason, there was a problem that high processing accuracy could not be obtained.

On the other hand, Japanese Patent Publication No. Sho 60-31621 discloses a method in which a pair of feed slides is provided on a feed table, and a spindle having a grindstone mounted on each feed slide is arranged. There is disclosed a technique for grinding. With the technology disclosed in this publication, it is only necessary to mount the work once (one chuck)
Thus, two grinding steps can be performed on the inner surface of the hole of the work.

[0004]

However, according to the technique disclosed in the above-mentioned publication, a plurality of grinding processes can be performed by a single chucking of the hole diameter of the work, but the outer surface of the work cannot be ground. In particular, it is desired that the inner surface side and the outer surface side can be ground by a single chucking for parts requiring high accuracy even on the outer surface of the work.

In this case, it is conceivable that a unit having an external surface processing grindstone for grinding the outer surface of the work and its spindle is externally mounted on a grinding device, and the inner surface and the outer surface of the work are ground by one device.

However, simply mounting an external processing unit on a grinding device requires a separate spindle for external processing and a means for sending out a table on which the spindle is installed, which makes the apparatus complicated and large. There is a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grinding apparatus which can grind an inner surface and an outer surface of a work with a simple and small configuration.

[0008]

In order to achieve the above object, the invention according to claim 1 comprises a work holding means for holding and rotating a work, an inner working grindstone for grinding an inner surface of the work, and an inner working grindstone. A spindle for internal machining with a grinding wheel, an external grinding wheel for grinding the outer surface of a workpiece, a spindle for external machining with an external grinding wheel, a spindle for internal machining and a spindle for external machining are integrally mounted and rotatable. , A feed slide on which the support plate is mounted, a feed table on which the feed slide is mounted, and a sending means for feeding the feed slide and the feed table to the workpiece.

According to the first aspect of the present invention, the workpiece is chucked to the workpiece holding means, and the inner surface processing grindstone is brought into contact with the inner surface of the workpiece by driving the inner surface processing spindle and the delivery means. Grinding. Next, the support plate is rotated to change the positions of the inner surface processing wheel and the outer surface processing wheel, and the outer surface processing spindle is driven to apply the outer surface processing wheel to the outer surface (contour) of the workpiece to grind the outer surface of the workpiece. . Therefore, the inner surface and the outer surface of the work can be ground only by mounting the work once (with one chuck). Moreover, there is no need to separately provide a feed slide equipped with a spindle for inner surface processing and a spindle for outer surface processing, and a sending means for each feed slide.
By rotating the support plate, the inner surface grinding and the outer surface grinding can be performed, so that the device can be simplified and downsized, and further, the grinding efficiency is good and the space can be saved. In addition, equipment costs and running costs can be reduced.

According to a second aspect of the present invention, in the first aspect of the invention, there is provided another support plate rotatably provided, a feed slide on which the other support plate is mounted, and a feed slide on which the feed slide is mounted. A feed table, and a feed slide and other sending means for moving the feed table with respect to the workpiece. The other support plate includes two internal processing spindles and an internal surface attached to each of the internal processing spindles. And a processing whetstone.

According to the second aspect of the invention, the same operation and effect as those of the first aspect of the invention can be obtained.
Furthermore, since another support plate is provided and the other support plate is provided with two spindles for internal grinding, a total of four types of grinding processes of three types of internal grinding processes and external grinding processes can be performed. . In addition, two types (steps) of grinding can be performed on the other support plate by one feed slide and its feeding means, so that a simple and small configuration can be achieved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A grinding apparatus according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a grinding apparatus 1 according to this embodiment comprises a work holding unit 3 for holding a work W (see FIG. 3) and a grindstone unit 5 on which a plurality of spindles for grindstones are mounted. Have.

The work holding unit 3 includes a first chuck 9a and a second chuck 9b for holding the work W on both sides of the headstock 7, and the work is mounted on each of the chucks 9a and 9b. The headstock 7 includes a rotating shaft 11
And the first chuck 9a and the second chuck 9b on the left and right by rotating by 180 degrees about the rotation shaft 11.
And the position is exchanged. This rotating shaft 11
Are driven by a motor 13. The chucks 9a and 9b are each driven to rotate by a main shaft (not shown).

As shown in FIG. 3 or FIG. 5, the work W is a part of the fuel injection pump in the present embodiment.
High shape accuracy (accuracy such as coaxiality and squareness) is required.

The grinding wheel side unit 5 includes the first grinding wheel unit 1
3 and a second grindstone unit 15 and perform two types of grinding processes for each unit.
The work W is ground in a total of four types of grinding processes.

The first grindstone unit 13 includes a first feed table 17 and a first feed slide 19 disposed on the first feed table 17, and the first feed table 17 is moved by a motor 23. Is controlled, and the drive of the motor 23 is controlled by the NC.

The first feed slide 19 has a support plate 2
The first spindle 29 for the first grindstone and the second spindle 31 for the second grindstone are fixed on the support 7, and the support plate 27 has a portion indicated by reference numeral 21 and a rotating mechanism built in the support plate 27. To be rotatable. The spindle 29 for the first grindstone and the spindle 31 for the second grindstone are arranged at predetermined angular positions. The feed slide 19 has a motor 30
The movement (delivery) to the work W is controlled by the control.

A first grindstone 33 is attached to the first grindstone spindle 29, and a second grindstone spindle 31 is attached to the first grindstone spindle 31.
The second grindstone 35 is attached. The first grindstone 33 and the second grindstone 35 are for grinding different inner diameter portions of the work W, respectively, as described later.

The second grindstone unit 15 includes a second feed table 37 and a second feed slide 39 disposed on the second feed table 37. The second feed table 37 is driven by two motors 41. The movement is controlled, and the drive of the motor 41 is controlled by the NC.

The second feed slide 39 has a support plate 4
Two spindles, a third grinding wheel spindle 47 and a fourth grinding wheel spindle 49, are fixed on the support 5, and the support plate 45 has a portion indicated by reference numeral 40 and a rotating mechanism built in the support plate 45. To be rotatable. Third
The grindstone spindle 47 and the fourth grindstone spindle 49 are arranged at positions where the respective spindles intersect. The movement (delivery) of the second feed slide 39 to the work W is controlled by a motor (delivery means) 50. Thus, the second feed slide 39
Since various types of grindstones and their spindles are mounted and the support plate 45 is rotated, the position of each spindle mounted on the support plate 45 can be changed and the inner surface and the outer surface can be ground. Good grinding efficiency and space saving can be achieved. That is, the third grinding wheel spindle 47 and the fourth grinding wheel spindle 49 are selectively used by rotating the support plate 45. Further, by driving one feed slide 39, internal grinding and external grinding can be performed, so that the apparatus can be simplified and downsized.

A third grindstone 51 is attached to the third grindstone spindle 47, and a fourth grindstone spindle 49 is attached to the third grindstone spindle 49.
The fourth grindstone 53 is attached. The third grindstone 51 is a grindstone for machining the inside of the hole of the work W, and the fourth grindstone 53 is an outer surface grindstone for grinding the outer surface (contour) of the work.

The fourth grindstone 53 has a small configuration with a smaller diameter as compared with a case where the conventional external grinding unit is a separate unit. 39, the third whetstone 41
And the spindle 47 thereof.

In FIG. 1, the work side unit 3
Between the and the grinding wheel side unit 5 is a grinding wheel shaping device 54, which is provided with a first dresser 55 and a second dresser 57 for dressing the grinding wheel. These dressers 55 and 57 are controlled so that the peripheral speed ratio with the grindstone becomes constant when the grindstone is dressed. The first and second dressers 55 and 57 are provided so as to be rotatable around rotation shafts 56 and 58. When dressing the grindstone, as shown in FIG. 1 when the work W is ground.
It is configured to be able to exit from the position shown in FIG.

Next, the operation of the present embodiment will be described. At the time of grinding the work W, first, the work W is attached to the first and second chucks 9a and 9b of the work-side unit 3, respectively.

Work W attached to first chuck 9a
First, as shown in FIG. 3, grinding is performed in a first step. The grinding in the first step is a step of grinding the large-diameter hole portion a formed in the work W by applying the first grindstone 33 to the work W by driving the first grindstone spindle 29 and sending it to the work W side. By reciprocating, the inner surface of the large-diameter hole portion a is ground.

In the subsequent second step, the support plate 27 is rotated, the second grindstone 35 is positioned on the work W side, and the second grindstone 35 is brought into contact with the medium-diameter hole portion b for grinding. In the second step, the spindle 31 for the second grindstone is driven,
The inner surface of the medium-diameter hole b is ground by being reciprocated by being sent out to the work W side.

When the second step is completed, in the work side unit 3, the headstock 7 is rotated by 180 degrees, and the work W is shifted to the second feed table 37 side. Here, the next new work is attached to the second chuck 9b on the first feed table 17 side to perform the first and second steps described above, and the work W attached to the first chuck 9a performs the third step. Perform In the third step, the third grinding wheel 5
1 grinds the tapered surface c of the hole of the work W. The sending direction of the third grindstone 51 is a direction along the tapered surface c as shown in FIG. When the third step is completed, the work W
A fourth step of grinding the outer end face d of the first step is performed.

In the fourth step, the support plate 45 is rotated,
The position of the spindle 49 for the fourth grindstone is changed and the fourth grindstone 53 is changed.
Is set at a position where it comes into contact with the end face d of the work, and then the second feed slide 39 is sent out in a direction along the end face d.
Grind the end face d. As shown in FIG. 2 in an enlarged manner, in the outer surface grinding in the fourth step, a thin grindstone as the fourth grindstone 53 is run along the end face d of the work W like a turning tool.

As described above, after the fourth step is completed, the headstock 7 is again rotated by 180 degrees, and the first chuck 9a and the second chuck 9a are rotated.
A new work W is mounted on the first chuck 9a by exchanging the position with the chuck 9b, and the above-described first to fourth steps are repeated.

As described above, in the present embodiment, the work W
Just once attached to the chuck (with one chuck)
Not only can grinding be performed in four different steps, but also grinding can be performed not only on the inner surface of the work W but also on the outer surface. Accordingly, since the inner surface and the outer surface (contour) of the work can be ground without mounting the work W again, the inner surface and the outer surface can be ground with high accuracy.

If necessary, each of the grindstones 33, 35, 5
For dressing 1, 53, dressers 55 and 57 are set on a regular or occasional basis to set the respective grindstones 33, 35, 5
Dress 1,53. These dressers 55 and 57
Is in the retracted position during grinding, and is set as shown in FIG. 1 during dressing.

Further, in the present embodiment, the spindle 47 for the third grindstone and the spindle 49 for the fourth grindstone mounted on the second feed slide 39 can be replaced as a unit. That is, when a spray nozzle is used as the workpiece W, a fifth grindstone 61 having a shape along the nozzle sheet shape is mounted on the support plate 60 as shown in FIG. The spindle 53 for the fifth grindstone and the spindle 67 for the sixth grindstone on which the sixth grindstone 65 is mounted are mounted. As a unit including the support plate 60, the spindle 47 for the third grindstone and the spindle 49 for the fourth grindstone 49 are mounted. By replacing the unit with the unit of the support plate 45 to which is mounted, another type of work can be ground. In this embodiment, the fifth grinding stone 6
1 is for rough grinding, and the sixth grindstone 65 is for finish grinding.

For example, as shown in FIG. 5, when the work W in the nozzle portion of the injection nozzle is ground, the first
In place of the grindstone 33, a grindstone 69 for inner diameter coarse grinding is attached,
An inner diameter finishing whetstone 70 is attached instead of the second whetstone.

Thus, the inner diameter part e is roughly ground in the first step, the inner diameter part e is finish-ground in the second step, the sheet part f is coarsely ground in the third step, and the sheet is The part f is finish-ground.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, the outer surface grinding by the fourth grindstone is not limited to the end surface of the work W, but may be the one to grind the outer peripheral surface. Further, as the workpiece W, various components can be used and those having various shapes can be used.

[0038]

According to the first aspect of the present invention, since one feed slide is provided with the grindstone for internal processing and its spindle, and the grindstone for external processing and its spindle, the work is mounted once. Only with one chuck, the inner and outer surfaces of the work can be ground with high precision. In addition, by driving one feed slide and one feed table, internal grinding and external grinding can be performed, so that the apparatus can be simplified and downsized, the grinding efficiency is improved, and the space can be saved. it can. Furthermore, equipment costs and running costs can be reduced.

According to the invention described in claim 2, according to claim 1
The present invention has the same effect as the invention described in (1), and further comprises another feed slide and a feed table, and the feed slide is provided with two grindstone spindles for inner surface grinding. A total of four types of grinding, grinding and external grinding, can be performed. Moreover, since two types (processes) of grinding can be performed by moving one feed slide and one feed table, the configuration is simple and small.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a grinding device according to a first embodiment.

FIG. 2 is a view showing a grinding state of a grinding wheel for external surface processing.

FIG. 3 is a process chart showing a process according to the embodiment.

FIG. 4 is a perspective view of a whetstone mounted on a second feed slide and a unit for replacing a spindle thereof.

FIG. 5 is a process chart showing another process according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Grinding apparatus 9a, 9b Chuck (holding means) 17 1st feed table (other feed table) 19 1st feed slide (other feed slide) 29 1st grindstone spindle (other inner surface processing spindle) 31 2nd Whetstone Spindle (Other Spindle for Other Internal Processing) 33 First Whetstone (Other Internal Processing Whetstone) 35 Second Whetstone (Other Internal Processing Wheel) 37 Second Feed Table 39 Second Feed Slide 41 Motor (Delivery Means) 45 Support plate 47 Third wheel spindle (internal processing spindle) 49 Fourth wheel spindle (external processing spindle) 50 Motor (delivery means) 51 Third wheel (internal processing wheel) 53 Fourth wheel (external processing wheel)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Osamu Yanai 3-13-26, Yayucho, Higashimatsuyama-shi, Saitama Prefecture Inside of Zexel Higashimatsuyama Plant (72) Inventor Koichi Nakajima 3--13, Yayumicho, Higashimatsuyama-shi, Saitama No. 26 F-term in Zexel Higashi-Matsuyama Plant (reference) 3C043 AA11 AB09 CC03 CC12 DD01

Claims (2)

[Claims] 1. A work holding means for holding and rotating a work, an inner working grindstone for grinding an inner surface of the work, an inner working spindle equipped with the inner working grindstone, and an outer working grindstone for grinding the outer surface of the work. , A spindle for external machining with an external grinding wheel, a support plate integrally mounted with a spindle for internal machining and a spindle for external machining, and a rotatable support plate, a feed slide equipped with the support plate, and a feed slide. A grinding apparatus comprising: a mounted feed table; and a feeding unit that feeds a feed slide and a feed table to a workpiece. 2. A support plate rotatably provided, a feed slide on which the other support plate is mounted, another feed table on which the feed slide is mounted, and a feed slide and a feed table for the workpiece. 2. The apparatus according to claim 1, further comprising another sending means for moving, wherein the other support plate includes two internal processing spindles and an internal processing grindstone attached to each of the internal processing spindles. Grinding equipment.