JPS6399172A - Grinding method - Google Patents

Abstract

PURPOSE:To enable a work to be efficiently ground to a predetermined size, by obtaining a difference between a grinding applied amount and a preset grinding amount and feeding a grinding wheel to the work by the amount of said difference to perform grinding. CONSTITUTION:In a stage that a small diameter bar-shaped material work 21 of injection needle or the like is rough ground by a grinding wheel 10, a grinding device 1, in which a differential transformer rod in a grinding amount detector 12 is adapted to move to a rough ground surface of said work 21, outputs a voltage value V2, in accordance with a moving amount of said rod, to a grinding amount arithmetic part 17, here it calculates a rough ground amount (L2+L3) of the work 21 by the voltage value V2 and a voltage value V1 detected when grinding is started. Subsequently, this rough ground amount is compared with a preset grinding amount L1, and their difference, that is, a grinding amount L4 necessary for finishing is calculated. Next the grinding device 1, which outputs a grinding instruction signal S2 in accordance with said grinding amount L4 to a grinding wheel feed amount control part 19 and a feed control signal S3 in accordance with the signal S2 to a driving part 11 from said control part 19, drives the driving part 11 to feed the grinding wheel 10 in a direction F by the difference L4, and the work 21 is ground to be finished by the preset grinding amount L1.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is directed to a rod-shaped workpiece with a small diameter such as a hypodermic needle, that is,
The present invention relates to a grinding method suitable for grinding a small-diameter rod-shaped object work.

(b), Prior Art FIG. 8 is a diagram showing how the machining origin of a small-diameter rod-like workpiece is determined when machining a regular-diameter bar-like workpiece using a conventional grinding method.

Usually, using a grinding device 26 shown in FIG.

When grinding the tip of the body-diameter rod-shaped object work 21 such as a hypodermic needle by the set grinding amount L1, first, before grinding,
Using the microswitch 25 of the grinding device 26, the machining start point of the small-diameter rod-shaped object work 21, that is, the machining origin MO is determined. That is, the outer periphery of the roller 25b of the microswitch 25 and the right end of the end surface 22a of the small-diameter rod-shaped object work 21 are aligned as shown in FIG. 8, and in this state, the disc-shaped grindstone 10 is The grinding wheel 10 and the micro switch 25 are brought into contact with each other, and the contact portion 25c is driven via the lever 25a, and the machining origin MO is determined from the position of the grinding wheel 10 in the directions of arrows E and F at that point. 1
0 wears out as the diameter decreases as machining progresses, so the operation of setting the machining origin MO is necessary to compensate for such wear. ).

Next, when the machining origin MO is determined, the grinding wheel 10 is moved so that the outer circumferential surface 10a of the grinding wheel 10 protrudes from the machining origin MO by the length of the thin rod-shaped object workpiece 21 to be ground in the F direction. Feed it to the workpiece 21. In this state, the grindstone 1o is reciprocated within a predetermined range in a direction perpendicular to the plane of the paper in the figure with respect to the small diameter rod-like workpiece 21, and the tip of the small-diameter rod-like workpiece 21 is ground by a set grinding amount L1.

(C) 0 Problems to be Solved by the Invention However, the above-mentioned microswitch 25 is designed to prevent the small-diameter rod-like object workpiece 21 from interfering with the grindstone 10 when the grindstone 10 is grinding the small-diameter rod-like object work 21. It is provided a predetermined distance apart from the work 21. Therefore, micro switch 2
The work of aligning the outer circumferential surface of the roller 25b of No. 5 with the end surface 22a of the small-diameter rod-shaped object work 21 is very time-consuming and puts an excessive burden on the operator. For this reason,
Overall machining efficiency decreases.

Furthermore, since the roller 25b comes into contact with the grindstone 10 every time the work to determine the machining origin MO is performed, it wears out early, and the machining origin MO determined by the worn roller 25b
If the grinding was done based on the reference, the small diameter rod-shaped object work 21
There is an inconvenience of grinding too much.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a grinding method that can grind a small-diameter rod-shaped workpiece with high processing efficiency and improve processing accuracy.

(d) Means for Solving Problem 9, that is, the present invention, is at the stage where a small diameter rod-shaped object workpiece (21) is ground by the grindstone (10).

The amount ground (L2+L3) until then is detected using the grinding amount detection means (12), and the detected grinding amount (L2+L3) is detected using the grinding amount detection means (12).
L2+L3), in order to grind the small-diameter rod-shaped object workpiece (21) by the set grinding amount (Ll), calculate the amount (L4) that should be ground afterwards, and then calculate the amount that should be ground (L4).
The grindstone (10) is fed and ground by a distance corresponding to the small diameter rod-shaped object workpiece (21), and the small-diameter rod-shaped object workpiece (21) is ground by a set grinding amount (Ll). It is composed of

Note that the numbers in parentheses are for convenience and indicate corresponding elements in one drawing.

This description is not limited to the description on the drawings.

The same applies to the column "r(e), Effect" below.

(e) 0 effect With the above-described configuration, the present invention can provide a small-diameter rod-shaped object workpiece (
21), the amount of grinding up to that point (L2+L
3), and from the grinding amount (L2+L3) and the set grinding amount (Ll), calculate the grinding amount (
L4) is determined, the grinding wheel (10) is sent by a distance corresponding to the determined grinding amount (L4), and the small diameter rod-shaped object workpiece (2
1) It acts to grind.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing an example of a grinding apparatus to which an embodiment of the grinding method according to the present invention is applied.

FIGS. 2 and 3 are process diagrams showing how the amount of grinding of a rod-shaped object workpiece is detected when processing a rod-shaped object workpiece using the present invention, and FIG. FIG. 2 is a diagram showing the state of the tip of a small-diameter rod-shaped object workpiece that has been ground using the same method.

Figures 5 and 6 use another example of the grinding amount detection device,
FIG. 3 is a process diagram showing how the amount of grinding of a small-diameter rod-shaped object workpiece is detected.

FIG. 7 is a diagram showing still another example of the grinding amount detection device.

As shown in FIG. 1, the grinding device 1 has a machine body 2, and a table 3 is provided on the machine body 2 so as to be movable in directions of arrows A and B, which are left and right directions in the figure. On the table 3, a workpiece mounting stand 5 is provided for fixing and holding a small-diameter rod-like object workpiece. A workpiece supply table 6 for supplying a workpiece and a workpiece unloading table 7 for conveying a processed small-diameter rod-shaped object workpiece are provided. Further, the machine body 2 is provided with a spindle head 9, and a grindstone 10 formed in the shape of a disk is mounted on the spindle head 9.
It is mounted so that it can be rotated freely in the direction of arrow C. A drive unit 11 is connected to the grindstone 10, and by driving the drive unit 11, the grindstone 10 can be appropriately moved in the directions of arrows E and F.

Furthermore, a grinding amount detection device 12 is provided on the left side of the machine body 2 in FIG. 1, and the grinding amount detection device 12 has a differential transformer 13 and a drive cylinder 16, as shown in FIG. ing. The differential transformer 13 has a main body 13a, and a rod 13b is supported on the main body 13a so as to be movable in the directions of arrows E and F. Note that the rod 13b is
Drive cylinder 1 integrally attached to differential transformer 13
6, and by driving the drive cylinder 16, the rod 13b is appropriately moved in the directions of arrows E and F. Also, the differential transformer 13 has an E of the rod 13b.
, the amount of movement in the F direction is converted into a voltage value V, and this voltage value V
can be output to a grinding amount calculation section 17, which will be described later.

By the way, as shown in the first @, the differential transformer 13 of the grinding amount detection device 12 is connected to the grinding amount calculation unit 17, and the amount of movement of the rod 13b in the E-F direction is calculated from the differential transformer 13. A voltage value V corresponding to the grinding amount calculation section 17 is outputted to the grinding amount calculation section 17. The grinding amount calculation section 17 includes the grinding wheel feed amount control section 1
9, and the grindstone feed amount control section 19 is connected to the drive section 11 described above. Furthermore, the first
At the bottom of the figure, a workbench 20 for storing a scraper-shaped object work is provided.

Since the grinding device 1 has the above-mentioned configuration, in order to grind the tip of the body-diameter rod-shaped object work 21, such as a hypodermic needle, by the set grinding amount L1, as shown in FIG. A box scraper-like object work 21 is placed on the workbench 2 shown in FIG.
0 to the work supply table 6 on the table 3. Next, the small diameter rod-shaped object work 21 is mounted on the table 3 and fixedly held on the stand 5 in such a manner that the end surface 22a of the work tip 22 shown in FIG. do. In this state, the table 3 and the workpiece mounting base 5 are moved by a predetermined distance in the first direction of the arrow. Then, the small-diameter rod-shaped workpiece 21 fixedly held on the table 5 is positioned at a position facing the grinding amount detection device 12 .

Next, in this state, the drive cylinder 16 constituting the grinding amount detection device 12 is driven, and the rod 1 of the differential transformer 13 is
3b is made to protrude in the first direction of the arrow 8. Then, the rod 13b moves from the standby position shown by the solid line in the figure to the point where its tip 13d starts machining the small-diameter rod-shaped object work 21,
That is, it moves until it comes into contact with the machining origin MO. Then, a voltage value v1 corresponding to the amount of movement of the rod 13b in the direction of the arrow F is transferred from the differential transformer 13 to the WfN amount calculation unit 1 shown in the first @.
7 is output. The output voltage value v1 is.

It is stored in the grinding amount calculation section 17. When the voltage value v1 is stored in the grinding amount calculation section 17.

The drive cylinder 16 of the grinding amount detection device 12 is driven to retract the rod 13b in the direction of arrow E in FIG. 2 and return it to the standby position.

In this way, when the rod 13b returns to the standby position, the small-diameter rod-shaped object work 21 is rough-machined. To do this, first we need the grinding wheel 10 for the spindle head 9.

Rotationally driven in the direction of arrow C. Next, the grindstone 10 is made to protrude by a predetermined amount in the direction of the arrow F, and the table 3 is reciprocated once within a predetermined distance in the directions A and B in FIG. 1 together with the workpiece mounting base 5. Then, as shown in FIG.
2 is removed, and a rough-cut surface 22b is formed at the tip 22 of the workpiece.

The thin rod-shaped object work 21 is formed at a certain angle with respect to the axis CTC. Note that the amount of protrusion of the grindstone 10 in the direction F may be any appropriate amount that allows the small-diameter rod-shaped object work 21 to be roughly ground by an appropriate amount.

When the rough cutting surface 22b is formed on the workpiece tip 22, the drive unit 11 is driven to move the grinding wheel 1O in the direction indicated by the arrow F in FIG.
It is sent by a distance L3 in the direction.

In this state, the table 3 is made to reciprocate once within a predetermined distance in the A and B directions. Then, as shown in FIG. 4, the workpiece tips 22 are further scraped off in a range of length L3 by the grindstone 10, and the rough-cut surfaces 22c are aligned with the axis CTl of the small-diameter hog-shaped object workpiece 21. It is formed at a certain angle to the In this way, the rough cutting surface 22C is formed on the workpiece tip 22, thereby completing the rough cutting of the small diameter rod-shaped object work 21.

When the small-diameter rod-shaped object work 21 has been rough-machined,
The amount of grinding so far, that is, the amount of rough cutting (L2+L3) is detected. Therefore, by driving the drive cylinder 16 of the grinding amount detection device 112, the differential transformer 1
The rod 13b of No. 3 is made to protrude in the direction of arrow F. Then,
The tip 13d of the rod 13b has a rough-cut surface 22c formed on the tip of the workpiece 22, as shown by the imaginary line in FIG.
Move in direction F until it comes into contact with.

At this time, the differential transformer 13 outputs a voltage value v2 corresponding to the amount of movement of the rod 13b in the F direction to the grinding amount calculation section 17, and the grinding amount calculation section 17 receives the voltage value v2 that has been sent,
Using the memorized voltage value v1, calculate the roughing amount (L2+L3) of the small diameter rod-shaped object workpiece 21, and then calculate the roughing amount and the set grinding amount LL (fourth (see figure), and calculate the difference, that is, the amount of grinding L4 required for finishing. The grinding amount calculation section 17 outputs a grinding command signal S2 corresponding to the calculated grinding amount L4 to the grinding wheel feed amount control section 19,
The grindstone feed amount control section 19 outputs a feed control signal S3 according to the signal S2 to the drive section 11. Then, drive section 1
1 is driven, and the grindstone 10 is fed by L4 in the direction F in FIG.

During this time, the drive cylinder 16 of the grinding amount detection bag M12
is driven to return the rod 13b of the differential transformer 13 to the standby position.

In this way, when the grindstone 10 has moved in the F direction by L4, the small-diameter bar-like object work 21 is finished. Therefore, first, the table 3 is made to reciprocate once within a predetermined distance in the A and B directions. Then, the end surface 22a of the roughly cut workpiece tip 22 is further ground down by the grindstone 10 over a length L4, and the finished surface 22d is
It is formed to have a certain angle with respect to the axis CTI of the small-diameter tributary workpiece 21 (see FIG. 4). thus,
By forming the finished surface 22d, the finishing process on the small diameter rod-shaped object work 21 is completed.

As a result, the tip of the small-diameter rod-shaped object work 21 is ground by the set grinding amount L1.

When the small-diameter rod-like workpiece 21 has been ground by the set grinding amount L1, the grindstone 10 is returned to the predetermined standby position in the E direction, and the processed small-diameter rod-like workpiece 21 is mounted on the workpiece table 5. The workpiece is transferred to the workpiece unloading table 7 shown in FIG. And even more.

The processed small-diameter workpiece 21 is transferred to the workpiece unloading table 7.
From there, it is transported to a predetermined position outside the new agent device 1 by a conveyor or the like (not shown).

By the way, as the grinding amount detection means, it is also possible to use a grinding amount detection device 12 having a detection wind 15 as described below. Note that the same parts as those explained in FIGS. 1 to 4 are designated by the same reference numerals, and the explanation of the parts will be omitted. That is, as shown in FIGS. 5 and 6, the grinding amount detection device 12 has a detection wind 15 that is provided in a manner that can freely rotate in the direction of arrow J around a pin 15a. A rod 1 constituting the differential transformer 13 is located at a position apart from the pin 15a of the wind 15 upward in the figure by a predetermined alternating layer.
3b is pivotally attached via a pin 13c. Furthermore, a rod 16a is pivotally attached to the lower end of the detected wind 15 in the figure, and is supported by the drive cylinder 16 in a manner that allows it to protrude and retract in the directions of arrows E and F in the figure.

In order to obtain the finish grinding ff1L4 of the small-diameter rod-shaped object workpiece 21 shown in FIG. 4 using such a grinding amount detection device 12 having the detection air 15, first drive the drive cylinder 16 shown in FIG. Then, the rod 16a is moved back in the E direction. Then, the detection air 15 pivotally attached to the rod 16a moves in the direction of the arrow around the pin 15a from the standby position shown by the solid line in FIG. Turn by a small angle. Then, the rod 13b of the differential transformer 13 moves in the direction of arrow F while being pulled by the detected wind 15 via the pin 13c, and a voltage value v1 corresponding to the amount of movement is output to the grinding amount calculation section 17. hand.

The result is stored in the grinding amount calculation section 17. In addition.

At this time, the turning angle of the detected wind 15 is small.

Tip 15b of detection wind 15, rod 1 of differential transformer 13
3b moves almost linearly in the F direction.

Next, by rough-machining the small-diameter rod-shaped object work 21 using the grindstone 10, a rough-machined surface 2 is formed on the workpiece tip 22.
2b is formed, and the rough-cut surface 22b is further scraped off to form a rough-cut surface 22c.

When the rough-cut surface 22c is formed on the workpiece tip 22, the amount of grinding so far, that is, the amount of rough-cut (L2+L3)
(see FIG. 4) is determined using the detected wind 15. That is,
By retreating the rod 16a of the drive cylinder 16 shown in FIG.
Rotate by a small angle in the direction of the arrow. Then, the rod 13b of the differential transformer 13 moves in the F direction.

Therefore, a voltage value v2 corresponding to this movement amount is output from the differential transformer 13 to the grinding amount calculation section 17.

Then, the grinding amount calculation unit 17 calculates the voltage value v2.

From the voltage value v1 stored in memory, the rough cutting amount (L2
+L3). Note that since the amount of movement in the F direction between the tip 15b of the detected wind 15 and the rod 13b is proportional, the amount of rough cutting can be determined from the voltage values v1 and v2 corresponding to each amount of movement of the rod 13b described above. Next, the finishing grinding amount L4 is determined from the obtained rough cutting amount and the set grinding amount L1 that has already been stored in memory.

In addition, in the embodiment described above, the grinding amount detection bag [12
The differential transformer 13 and drive cylinder 16 that constitute the
As shown in FIGS. 5 and 6.

Although we have described the case in which the pin 15a, which supports the detected wind 15 in a rotatable manner, is arranged on both the upper and lower sides in the figure, the differential transformer 13 and the drive cylinder 16 are arranged relative to the pin 15a, as shown in Fig. 7. Of course, it is also possible to arrange them on the same side.

Furthermore, various configurations of the grinding amount detection device 12 can be considered in addition to the method using the detection wind 15.

That is, as long as the amount of grinding of the JBI diameter rod-shaped object work 21 can be detected, any configuration may be used, whether contact or non-contact.

(g) 0 Effects of the Invention As explained above, in the present invention, at the stage where the small-diameter rod-shaped object work 21 such as a hypodermic needle is ground by the grindstone 10, the amount (L2+L3) that has been ground up to that point is ground. It is detected using a grinding amount detection means such as the amount detection device 12, and from the detected grinding amount (L2+L3), a small diameter rod-shaped object work 2 is detected.
In order to grind 1 by the set grinding amount L1, the amount L4 to be subsequently ground is determined, and the grinding wheel 1o is moved by a distance corresponding to the determined amount L4 to be ground by the regular grinding rod-shaped object work 2.
1 and grind the small diameter rod-shaped object workpiece 21 by the set grinding amount L1. In order to perform grinding, one worker performs the labor-intensive task of aligning the outer circumferential surface of the roller 25b of the microswitch 25 with the end surface 22a of the small diameter rod-shaped object work 21 before starting grinding, and then determining the machining origin MO in this state. There is no need to do this, and processing efficiency can be improved accordingly.

Further, since the grinding amount detection means does not come into contact with the grindstone 10, it does not wear out, and it becomes possible to grind the small diameter rod-shaped object work 21 with high processing accuracy over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a grinding apparatus to which an embodiment of the grinding method according to the present invention is applied, and FIGS. FIG. 3 is a process diagram showing how the amount of grinding of a small-diameter rod-shaped object workpiece is detected. FIG. 4 is a diagram showing the state of the tip of a small-diameter rod-shaped object workpiece that has been ground using the present invention. Figures 5 and 6 use another example of the grinding amount detection device,
A process diagram showing how to detect the grinding amount of a small-diameter rod-shaped workpiece. Figure 7 is a diagram showing yet another example of the grinding amount detection device. Figure 8 is a process diagram showing how the grinding amount of a small-diameter rod-shaped object work is detected. FIG. 2 is a diagram showing how the processing origin of a small-diameter rod-shaped object workpiece is determined when processing the workpiece. １０・・・Whetstone

Claims (2)

[Claims] (1) When grinding a small-diameter rod-shaped object workpiece, at the stage where the small-diameter rod-shaped object workpiece is ground by the grindstone, detecting the amount of grinding so far using a grinding amount detection means; From the detected amount of grinding, in order to grind the small-diameter rod-shaped object workpiece by the set amount of grinding, the amount to be subsequently ground is determined, and further, the grinding wheel is moved by a distance corresponding to the determined amount to be ground. A grinding method configured to feed and grind a small-diameter rod-like workpiece, and grind the small-diameter rod-like workpiece by a set grinding amount. (2) When the small-diameter rod-shaped object workpiece is rough-processed by the grindstone, the amount of grinding so far is detected using a grinding amount detection means, and from the detected grinding amount, the small-diameter rod-shaped object is roughly processed. In order to grind the object workpiece by the set amount of grinding, the amount to be ground after this is determined, and the grinding wheel is then sent to the small diameter rod-shaped object workpiece by a distance corresponding to the determined amount to be ground to finish it. 2. The grinding method according to claim 1, wherein said small-diameter rod-shaped object workpiece is ground by a set grinding amount by performing the machining.