JPH01170802A - Outside diameter dimension measuring instrument for centerless grinding machine - Google Patents

Abstract

PURPOSE:To measure outside diameters of all works subjected to through feed grinding in online during carrying by measuring outside diameter dimensions with laser light when the work carried by a conveyor passes a measuring gap part. CONSTITUTION:Works W successively ground by a centerless grinding machine 10 are carried to a measuring V block 20 by conveyors 15 and 16 of a work carrying device 13, and during this carrying, dry air is blown from air blow devices 40 and 41 and a grinding liquid, ground powder, etc., is removed to prepare for measurement. While work W passes the part of a gap 33 provided in the V block 20, its outside diameter dimensions are measured by a laser measurer 14. When the work W does not exist in the part of the gap 33, all of the light emitted from a light projecting part is made incident on a light receiving part 43 through the part of the gap 33; but when the work W passes the part of the gap 33, a part of the laser light is intercepted and the light receiving part 43 receives the laser light, which is transmitted on and under the work W, to measure the diameter in the vertical direction of the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an apparatus for measuring the outer diameter of a centerless grinding machine, and more specifically, to an apparatus for measuring the outer diameter of a workpiece continuously on-line during transportation after through-feed grinding. This invention relates to a device for total measurement.

Conventional technology and its problems Conventionally, with centerless grinders, the workpiece after through-feed grinding is transported by a chain or flat belt, and the outer diameter is measured by sampling using a contact-type sizing device to control dimensions. I was doing it.

By the way, in order to measure the outer diameter of a workpiece, it is desirable to transport it with the axis line horizontal.
In particular, it is difficult to transport short workpieces in a stable posture, and if the dimensions are measured by sampling, the mechanism of the workpiece transport device becomes complicated, which can lead to malfunctions. Furthermore, in recent years, extremely high dimensional accuracy has become required, and the conventional measurement by sampling is insufficient, and there is a demand for measuring the entire workpiece, but at the same time, cycle times are becoming shorter. Therefore, it is impossible to measure all the parts using conventional contact-type sizing devices.

For this reason, the present inventors developed a workpiece transport device that supports the workpiece after through-feed grinding so that its axis is almost horizontal and transports the workpiece in the axial direction, and It is equipped with a laser measuring device that measures the outer diameter dimension by irradiating the workpiece with a laser beam from a direction perpendicular to the axis of the workpiece. proposed an outer diameter measuring device for a centerless grinding machine equipped with a pair of left and right round belts that feed the belt forward (December 1988, 2°! Real, ::7:::II"shi;1. .r's 1 ""C' b The workpieces after through-feed grinding are transported in a stable posture, and all of them can be measured online with high accuracy and in a short time while being transported.

However, depending on the shape and dimensions of the workpiece, it may be impossible to measure the workpiece on the round belt by shining a laser beam on it.

The purpose of this invention is to solve the above-mentioned problems, and to make it possible to measure the outer diameter of all workpieces after through-feed grinding online with high precision and in a short time while they are being transported, regardless of the shape and size of the workpiece. An object of the present invention is to provide a dimension measuring device.

Means for Solving the Problems The outer diameter dimension measuring device according to the present invention supports a workpiece after through-feed grinding so that its axis is approximately horizontal in a centerless grinder that grinds a workpiece by through-feed grinding. It is equipped with a workpiece transport device that transports the workpiece in the axial direction of the workpiece transport device, and a laser measuring device that measures the outer diameter dimension by irradiating a laser beam onto the workpiece that is moving on the workpiece transport device from a direction perpendicular to the axis of the workpiece. The workpiece conveyance device includes a conveyor and a measurement V-block placed in front of the conveyor, and a measurement gap for passing laser light to the workpiece. It is characterized by being provided with.

Note that in this specification, front, rear, left, and right refer to the transport direction of the workpiece. That is, the right side of FIG. 1 is the front, the left side is the rear, the upper side of the figure is the left, and the lower side is the right.

The workpiece is transported by the conveyor of the workpiece transport device for measurement.
transported to the block. Then, while the workpiece passes through the measuring V block in front of this conveyor, the outer diameter of the workpiece is measured by a laser measuring device. At this time, since the block (1) is provided with a measurement gap for allowing the laser beam to pass through and hit the workpiece, measurement is possible regardless of the shape and dimensions of the workpiece. Furthermore, since the outer diameter dimension is measured by a laser measuring device, the measurement accuracy is good and the time required for measurement is short. Therefore, it becomes possible to measure all workpieces after through-feed grinding online while they are being transported.

Embodiment FIGS. 1 and 2 schematically show the workpiece outlet side part of the centerless grinder (10) and the outer diameter dimension measuring device (11), and FIGS. 3 to 7 show the measuring device (11). 11) are shown in detail.

= 4 - In the centerless grinding machine (10), the workpieces (W) (not shown) are successively fed between the grinding wheel and the adjustment wheel by the workpiece feeding device so that the axes thereof face forward and backward. It is ground and sent to the exit guide (12) by the thrust during grinding.

The measuring device (11) includes a workpiece transport device (13) that supports the workpiece (W) so that its axis is almost horizontal and sends it in the axial direction, and a workpiece transport device (13) that measures the outer diameter of the workpiece (W) being transported. It consists of a laser measuring device (14) that measures non-contact.

The conveyance device (13) includes three conveyors (15) (1B) (17) arranged in one row in the front and back, a first conveyor (15) at the rear, and an exit guide (12) of the centerless grinder (10). A V-shaped log guide (18) placed between the
a first V block (19) for draining water disposed between the first conveyor (15) and the intermediate second conveyor (16);
It consists of a 2nd V block (20) for measurement placed between the 2nd conveyor (16) and the 3rd conveyor (17) at the front, and these are perpendicular to the left side of the conveyance path of the workpiece (W). It is provided on the right side of the arranged frame plate (21).

The first and second conveyors (15) (1B,) are
A pair of rubber light control bells) and (22) support the workpiece (W) so that its axis is almost horizontal and feed it in the axial direction.The drive pulley (23) at the front end and the driven pulley at the rear end A pulley (24), an intermediate tension pulley (25), and a pair of left and right endless light bells (l-<22) hung on these pulleys.
It becomes more. As shown in detail in Figure 3, each pulley (,2
3) An annular guide groove (26) with a substantially semicircular cross section is formed on the outer peripheral surface of (24,) (25,), and the left round belt (22) is inserted into the left guide groove (26), and the right side round belt (22) is inserted into the left guide groove (26). The right round belt (22) is hung on each guide groove (26). Note that the outer diameter between the guide grooves (26) on the outer peripheral surfaces of the drive pulley (23) and the driven pulley (24) is small to avoid contact with the workpiece (W) placed on the round belt (22). It has become.

The drive pulley (23) is driven by a drive motor (not shown).
The left and right round belts (22) move at the same speed in the direction of the arrows in Figures 1 and 2, and the upper part moves forward and approximately horizontally. Move to.

The feed speed of the first and second conveyors (15) (ifi) is slightly faster than the passing speed of the centerless grinder (10). Drive pulley (23) and driven pulley (24)
Under the upper part of round bell l-(22) between round bell 1
- (22) A round belt guide (27) is arranged to prevent the workpiece (W) from spreading from side to side due to its weight. As shown in detail in Figure 4, the round belt guide (
27) has a horizontal plate shape, and a round belt (22) is on the top surface.
A guide groove (28) having a substantially semicircular cross section is formed to receive the guide. The portion between the left and right guide grooves (28) on the upper surface of the round belt guide (27) is low so as not to come into contact with the workpiece (W) on the round bell 1-(22).

The third conveyor (17) is a normal flat belt conveyor, and its feeding speed is the same as that of the first and second conveyors (15) (1
The feed speed is slightly faster than B).

Although not shown, a suitable workpiece (W) guide is provided above the flat bell l-(44) of the third conveyor (17).

As shown in Figures 5 to 7, each V block (19) (20) has a substantially T-shape when viewed from the side, and a square groove (29) extending vertically is formed on its left side. , a positioning protrusion (30) formed perpendicularly to the frame plate (21)
This corner groove (29) is fitted.

In addition, a vertically long elongated hole (31) is formed in the lower part of the block (19) (20), passing through it from side to side. Blocks (19) and (20) are fixed to the frame plate (21) so that their vertical positions can be adjusted. ■Block (19) (2
0) A V groove (32) extending in the front-rear direction is formed on the upper surface, and a gap for measuring the outer diameter dimension is cut in the middle part between the front and rear of the second V block (20) from the upper surface to below the V groove (32). (33) is formed. 1st V block (1
9) and the gap between the second V block (20) (
At the bottom of the V miso (32) after 33), place ■ block (1
, 9) Drain holes (34) are formed that extend to the right side of (20), and drain holes (34) connected to a vacuum device (path shown) are formed at the side ends of these drain holes (34). pipe (35
) are connected. Plate-shaped rear entrance guides (37) are fixed to the rear of the first V block (19) and to both sides of the V groove (32) on the rear side of the gap (33) of the second V block (20). . These inlet guides (37) are V-shaped and are connected to the rear conveyor (15).
It extends to near the front end of the workpiece conveyance surface (the part where the workpiece is actually placed on the belt) of the round belt (22) in (1B). The V groove (3) in front of the first V block (19) and the gap (33) in the second V block (2o)
There are plate-shaped front exit guides (3) on both sides of the
8) is fixed. These exit guides (38) are also V-shaped and extend close to the rear end of the workpiece transport surface of the round belt (22) and flat belt (44) of the front conveyor (1B) (17).

2 v pro tsuku (19n (20) + 7) V groove (
Above the drain hole (34) of the compressed air source (39)
) Air blow devices (40) (41) connected to the air blowers (40) and (41) are arranged.

A laser measuring device (14) is provided in the second V block (20). This laser measuring device (14) has a light projecting section (42) placed on one side of the measurement gap (33) of the second V block (20), for example on the right side, and a light projecting section (42) placed on the opposite side of the gap (33), for example on the left side. The laser beam emitted from the light projecting part (42) passes through the gap (33) and reaches the light receiving part (43).
3).

Next, a centerless grinder (10) and a measuring device (11)
) operation is explained.

First, in the centerless grinder (10), as described above, the workpieces (W) are ground one after another, and the exit guide (10) is ground.
2) will be sent. The workpiece (W) that has undergone through-feed grinding in this way is further processed by the subsequent workpiece (W).
is pushed forward by the transport device (13), guided by the inlet guide (18) and transferred onto the round belt (22) of the first conveyor (15), thereby being sent forward.

The feed rate of the first conveyor (15) is set by the centerless grinder (
The passing speed of the work piece (W) on the round belt (22) of the first conveyor (15) is a little faster than that of
) moves back and forth away from the following workpiece (V>).

Further, the workpiece (W) is supported from below on both the left and right sides by contacting only the round bell l-(22), and the driven pulley (24),
It does not come into contact with the round belt guide (27) or the drive pulley (23>).The workpiece (W) is guided from the first conveyor (15) to the entrance guide (37) and transferred to the first V block (19). The workpiece is then pushed forward by the following workpiece (W), and is guided by the exit guide (38) and transferred from the first V block (19) to the second conveyor (16>.At this time, the workpiece at the entrance Since there is a guide (37),
Even in the case of a short workpiece (W), the workpiece (W) does not get caught on the end face of the V block (19), and can be reliably transported in a stable posture. While the workpiece (W>) is passing over the first V block (19), dry air is blown from the first air blower (40), and the drain hole (1) of the block (19) is 34)
Grinding fluid, grinding powder, etc. are removed from the machine. Grinding fluid and grinding powder adhere to the surface of the workpiece (ν) immediately after grinding, and even if you try to remove it while conveying it on the conveyor (15),
Since it also adheres to the round belt (22) of the conveyor (15), it is difficult to completely remove it. The above measuring device (
11), the grinding fluid and grinding powder can be almost completely removed while moving on the V block (19), and the second
When the workpiece (W) is transferred onto the conveyor (1B), almost no grinding fluid or grinding powder is attached to the workpiece (W). Therefore, grinding fluid and grinding powder do not adhere to the round belt (22) of the second conveyor (16). Similarly, the workpiece (W) transferred onto the second conveyor (16) is transferred to the second v-block (
It is guided by the entrance guide (37) of the conveyor belt (20) and gets on the second V block (20), and passes over this to the third conveyor (17).
) moved above. Then, while the workpiece ('W) passes through the drain hole (34) of the second V block (20), the grinding fluid and grinding powder are completely removed, as before, and the workpiece is ready for measurement. While the workpiece (W) is passing through the gap (33), the outer diameter dimension is measured by the laser measuring device (14). When there is no workpiece (W) in the gap (33), all the laser light emitted from the light emitting part (42) of the laser measuring device (14) passes through the gap (33), as described above. It enters the light receiving part (43),
While the workpiece (w) passes through the gap (33), a portion of the laser light emitted from the light projecting section (42) is directed toward the workpiece (w).
W). At this time, the part of the workpiece ('W) that the laser beam hits comes out of the gap (33), so the part of the workpiece ('W) that is hit by the laser beam comes out of the light emitting part (42) of the laser measuring device (14) and the part of the workpiece (W) that is hit by the laser beam. The laser beam that has passed through the upper and lower parts is sent to the light receiving section (43
), the vertical diameter of the workpiece (W) can be measured. Note that since the measurement of the outer diameter dimension using a laser measuring device itself is well known, detailed explanation will be omitted. The workpiece (W) whose outer diameter dimension has been measured in this way is further sent forward at high speed by the third conveyor (17) and discharged by an appropriate means.

Although not shown, the measuring device (11) is equipped with a control device that controls the centerless grinding machine (10) based on the measurement results of the outer diameter dimension, and the machining dimension is corrected based on the measured value. ing. Also, based on the measured values, good products and defective products are distinguished and discharged. Note that such a configuration is also well known, so detailed explanation will be omitted.

In the above measuring device (11), when the dimensions of the workpiece change, (1) the blocks (19) and (20) can be replaced in a cassette manner. At this time, as mentioned above, V
Blocks (19) (20) have square grooves (29) and long (
31) to the frame plate (21), so replacement is easy. In the above embodiment, a notch is provided in one V block (20) to form a measurement gap (
33), but two blocks in the form of dividing the above block (20) into two, front and rear, are placed front and rear,
A measurement gap may be formed between these.

Effects of the Invention According to the apparatus of the present invention, as described above, even if the workpiece is particularly short, the workpiece after through-feed grinding can be transported in a stable posture, and all the workpieces can be transported online while being transported. , can be measured accurately and in a short time,
Moreover, the structure of the workpiece conveyance device is simple.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an outer diameter dimension measuring device showing one embodiment of the present invention, FIG.
4 is an enlarged sectional view taken along line IV--IV in FIG. 1, FIG. 5 is an enlarged view of the measuring V block in FIG. 1, and FIG. FIG. 5 is a side view, and FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6. (10)...Centerless grinding machine, (11)...Outer diameter dimension measuring device, (13)...Workpiece conveyance device, (14)...
)...Laser measuring device, (16)...Conveyor, (2
0)... V block for measurement, (33)... Gap for measurement, (W)... Workpiece. that's all

Claims (1)

[Claims] In a centerless grinding machine that grinds a workpiece using through-feed grinding, a workpiece transfer device that supports the workpiece after through-feed grinding so that its axis is almost horizontal and transports it in the axial direction, and a It is equipped with a laser measuring device that measures the outer diameter dimension by irradiating a moving workpiece with a laser beam from a direction perpendicular to the axis of the workpiece, and a workpiece transfer device is placed in front of the conveyor and the conveyor. 1. An outer diameter dimension measuring device for a centerless grinding machine, characterized in that the V block is provided with a measuring gap for allowing laser light to pass through and hit a workpiece.