JPS6399171A - Grinding device - Google Patents

Abstract

PURPOSE:To enable a device to accurately grind a work by the predetermined grinding amount, by providing a grinding wheel feed control part which controls a grinding wheel to be fed to the work by the distance corresponding to a difference between the grinding amount, detected by a grinding amount detector, and the preset grinding amount. 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 amount L2+L3 of the work 21 is detected by a grinding amount detector 12. A difference L4 between this ground amount L2+L3 and a preset grinding amount L1 is calculated by a grinding amount arithmetic part 17. A grinding device, which outputs a grinding instruction signal S2 in accordance with said difference L4 to a grinding wheel feed amount control part 19 from said arithmetic part 17 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 device suitable for use in grinding a small-diameter rod-shaped object.

(b), conventional technology FIG. 8 is a diagram showing the main parts of a conventional grinding device.

Usually, using a grinding device 26 shown in FIG.

When grinding the tip of a workpiece 21 such as a hypodermic needle over a range of a predetermined ratio fiL1 from the processing origin MO, first grind the outer circumference of the roller 25b of the microswitch 25 and the processing start point of the workpiece 21, i.e. The machining origin MO is aligned as shown in FIG. 8, and in this state, the disc-shaped grindstone 10 is sent in the F direction.

The grindstone 10 and the microswitch 25 are brought into abutting contact and the contact portion 25c is driven via the lever 25a, and the processing origin MO is moved from the current position of the grindstone 10 in the directions of arrows E and F.
I'm looking for.

In this way, when the machining origin MO is determined, the grinding wheel 1
0, its outer peripheral surface 10a is from the machining origin MO to the workpiece 21
so that it protrudes in the F direction by the length you are trying to grind.
In this state, feed the whetstone 1o against the grinder 21.
The workpiece 21 is reciprocated within a predetermined range in a direction perpendicular to the plane of the drawing, and the end faces 22a of the workpiece 21 are ground within a predetermined distance L1 to form a finished surface 22d.

(C) 0 Problems to be Solved by the Invention However, in such a grinding device 26, the workpiece 21 and the microswitch 2
5 is the grindstone 10 when grinding the workpiece 21 with the grindstone 1o.
In order to prevent the switches 25 and 25 from interfering with each other, they are arranged at a predetermined distance from each other. Therefore, the outer peripheral surface of the roller 25b of the microswitch 25 and the end surface 22a of the work 21
It takes a lot of effort to match the two.

This increases setup time and reduces overall processing efficiency.

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 workpiece 21 is ground using this as a reference, there is a problem that the workpiece 21 will be ground 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 device that can grind a workpiece with high processing efficiency and improve processing accuracy.

(d) Means for solving the 0 layer point, that is, the present invention provides a means for solving the 0 layer point, that is, the grinding amount (L2 + L3
), and a grinding amount detecting means (12) is provided, and a difference (L4) between the grinding amount (L2+L3) detected by the grinding amount detecting means (12) and the grinding amount (Ll) that should be ground is calculated. A grinding wheel that is provided with an amount calculation section (17) and further controls the grindstone (1o) to be sent to the workpiece (21) by a distance corresponding to the difference (L4) calculated by the grinding amount calculation section (17). It is configured by providing a feed amount control section (19).

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 allows, at the stage where the workpiece (21) is ground by an appropriate amount, the grinding amount (L2+L3) that has been ground up to that point and the grinding amount that should originally be ground (Ll). The difference (L4) is determined, and the grindstone (1o) is controlled according to the determined difference (L4) to process the workpiece (21).

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

FIG. 1 is a plan view showing an embodiment of a grinding device according to the present invention.

Figures 2 and 3 are diagrams showing how the grinding amount of a workpiece is detected using the grinding amount detection device of the grinding device, and Figure 4 is a diagram showing how the tip of the workpiece that has been ground is detected using the grinding device. Figure shown.

Figures 5 and 6 use another example of the grinding amount detection device,
A diagram showing how the amount of grinding of a workpiece is detected. FIG. 7 is a diagram showing yet 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. A workpiece mounting stand 5 is provided on the table 3 to securely hold the workpiece, and a workpiece mounting stand 5 is provided on both left and right sides of the workpiece stand 5 to supply the workpiece to the stand 5. A supply table 6 and a workpiece unloading table 7 for unloading processed workpieces are provided. Further, the machine body 2 is provided with a spindle head 9, and a disk-shaped grindstone 10 is mounted on the spindle head 9 in a manner that it can freely rotate in the direction of arrow C. A drive unit 11 is connected to the grindstone 1o, and by driving the drive unit 11, the grindstone 1o can be moved appropriately in the directions of arrows E and F. , a grinding amount detection device 12 is provided, and the grinding amount detection device 12 has a differential transformer 13 and a drive cylinder 16, as shown in FIG. 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 can be appropriately moved in the directions of arrows E and F. Further, the differential transformer 13 can convert the amount of movement of the rod 13b in the E and F directions into a voltage value V, and output this voltage value V to a grinding amount calculation section 17, which will be described later.

By the way, as shown in FIG. 1, the differential transformer 13 of the grinding amount detection device 12 is connected to a grinding amount calculating section 17, and the amount of movement of the rod 13b in the E and F directions 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
A workbench 20 for storing workpieces is provided at the bottom of the figure.

Since the grinding device 1 has the above-described configuration, in order to grind a workpiece 21 such as a hypodermic needle, a predetermined number of workpieces 21 are first fed from the workbench 20 to the workpiece supply table 6 on the table 3. . Next, the workpiece 21 is fixedly held on the table 3 on the table 3 so that the end surface 22a of the workpiece tip 22 shown in FIG. 2 is aligned in a line perpendicular to the plane of the drawing. In this state, the table 3 and the workpiece mounting base 5 are moved by a predetermined distance in the direction of arrow A in FIG. Then, the workpiece is mounted on the workpiece 2 fixedly held on the table 5.
1 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 direction of arrow F in FIG. Then, the rod 13b moves from the standby position shown by the solid line in the figure until its tip 13d reaches the machining start point of the workpiece 21, that is, the machining origin M.
Move until it touches O. Then, a voltage value v1 corresponding to the amount of movement of the rod 13b in the direction of the arrow F is outputted from the differential transformer 13 to the grinding amount calculation section 17 shown in FIG.

The output voltage value v1 is stored in the grinding amount calculation section 17.

When the voltage value v1 is stored in the grinding amount calculation unit 17, the drive cylinder 16 of the grinding amount detection device 12 is driven to move the rod 13b back 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 workpiece 21 is rough-machined. To do this, first, the grindstone 10 of the spindle head 9 is driven to rotate 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. 4, the end surface 2 of the workpiece tip 22 is
2a, a range of length L2 is scraped off, and the workpiece tip 2
2, a rough-cut surface 22b is formed at a constant angle with respect to the axis CTI of the workpiece 21. In addition, whetstone 1
The amount of protrusion of 0 in the F direction may be any appropriate amount that allows the workpiece 21 to be roughly cut by an appropriate amount.

When the rough cut surface 22b is formed on the workpiece tip 22, the drive unit 11 is driven to move the grindstone 10 in the direction indicated by the arrow F in FIG.
The distance is sent in the direction by L3.

In this state, the table 3 is made to reciprocate once within a predetermined distance in the A and B directions. Then, the workpiece tip 22 is further ground down over a length L3 by the grindstone 10, as shown in FIG.
It is formed at a constant angle with respect to one axis CTI. thus.

By forming the rough-cut surface 22c on the workpiece tip 22, the rough-cutting of the workpiece 21 is completed.

After the workpiece 21 has been rough-machined, the drive cylinder 16 of the grinding amount detection device 12 is driven to cause the rod 13b of the differential transformer 13 to protrude in the direction of arrow F, as shown in FIG. Then, the rod 13b has its tip 13d
moves in the F direction until it comes into contact with the rough-cut surface 22c formed on the workpiece tip 22, as shown by the imaginary line in FIG.

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,
The workpiece 21 is
The rough cutting amount (i.e., L2+L3) is calculated, and the obtained rough cutting amount is calculated.

The grinding amount L1 (see FIG. 4) which is originally to be ground is already stored in memory, and the difference therebetween, that is, the grinding amount L4 required for finishing is calculated. The grinding amount calculation section 17 outputs a grinding command signal S2 corresponding to the obtained grinding amount L4 to the grindstone feed amount control section 19, and the grinding amount calculation section 17
9 sends a feed control signal S3 corresponding to the signal S2 to the drive unit 11.
Output to.

Then, the drive unit 11 is driven, and the grindstone 10 is sent by L4 in the direction F in FIG. During this time, the drive cylinder 16 of the grinding amount detection device 12 is driven to return the rod 13b of the differential transformer 13 to the standby position.

In this way, when the grindstone 1o has moved by L4 in the F direction, the table 3 is moved by 1 within a predetermined distance in the A and B directions.
make it go back and forth. Then, the end surface 22a of the workpiece tip 22, which has been roughly cut, is further ground down over a length L4 by the grindstone 10, and the finished surface 22d becomes the workpiece 2.
1 (see FIG. 4).

In this way, when the finished surface 22d is formed on the workpiece tip 22, the grindstone 1o is returned to the predetermined standby position in the E direction, and the processed workpiece 21 is mounted on the workpiece stand 5.
From there, the workpiece is transferred to the workpiece unloading table 7 shown in FIG. Further, the processed workpiece 21 is transported from the workpiece unloading table 7 to a predetermined position outside the grinding apparatus 1 by a conveyor (not shown) or the like.

By the way, as the grinding amount detection means, it is also possible to use a grinding amount detection device 12 having a detection system 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 system 15 that is rotatable in the direction of arrow J around a pin 15a. A rod 1 constituting the differential transformer 13 is located at a position extending a predetermined distance upward in the figure from the pin 15a of the system 15.
3b is pivotally attached via a pin 13c. Furthermore, a rod 16a is pivotally attached to the lower end of the detection system 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 final grinding amount L4 of the workpiece 21 shown in FIG. 4 using the grinding amount detection device 12 having the detection system 15, first drive the drive cylinder 16 shown in FIG. 16a is moved backward in the E direction. Then, the detection system 15 pivotally attached to the rod 16a moves by a small angle in the direction of the arrow around the pin 15a from the standby position shown by the solid line in the figure until its tip 15b abuts the machining origin MO of the workpiece 21. rotate. Then, the differential transformer 13
The rod 13b moves in the direction of arrow F while being pulled by the detection system 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, which calculates the grinding amount. The information is stored in the memory section 17. Note that at this time, since the rotation angle of the detection system 15 is minute, the tip 15b of the detection system 15.

The rod 13b of the differential transformer 13 moves substantially linearly in the F direction.

Next, the workpiece 21 is rough-cut using the grindstone 10 to form a rough-cut surface 22b on the tip end portion 22 of the workpiece, and the rough-cut surface 22b is further ground away 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 (L
2+L3) (see FIG. 4) is determined using the detection mold 15.

That is, by retracting the rod 16a of the drive cylinder 16 shown in FIG. Rotate only. Then,
The rod 13b of the differential transformer 13 moves in the F direction. Therefore, a voltage value (2) 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 roughing amount (L2+L3) from the voltage value v2 and the stored voltage value v1. Note that since the amount of movement in the F direction between the tip 15b of the detection mold 15 and the rod 13b is proportional, the above-mentioned rod 13b
The amount of rough cutting can be determined from the voltage values v1 and v2 corresponding to each movement amount.

Next, the finishing grinding amount L4 is determined from the obtained rough cutting amount and the grinding amount L1 that is originally stored in memory.

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

The case has been described in which the differential transformer 13 and the drive cylinder 16 are arranged on both the upper and lower sides of the pin 15a that rotatably supports the detection mold 15 in the figure.

As shown in FIG. 7, it is of course possible to arrange them on the same side with respect to the pin 15a.

Furthermore, various configurations of the grinding amount detection device 12 are conceivable in addition to the method using the detection mold 15.

That is, as long as the amount of grinding of the workpiece 21 can be detected, any configuration may be used, whether contact or non-contact.

(g) 0 Effects of the invention As explained above, the present invention has the following advantages:
A grinding amount detection means such as a grinding amount detection device 12 for detecting 2+L3 is provided, and the grinding amount L2 detected by the grinding amount detection means is provided.
A grinding amount calculating section 17 is provided which calculates the difference L4 between +L3 and the grinding amount L1 that should be ground, and furthermore, the grinding amount calculating section 1
The grindstone 10 is moved by a distance corresponding to the difference L4 calculated by 7.
Since the structure is provided with a grindstone feed amount control unit 19 that controls the amount of grinding wheel fed to the workpiece 21, first, at the stage where the workpiece 21 has been roughly ground by an appropriate amount, the grinding amount L2+L3 that has been ground up to that point is compared with the grinding amount that was originally ground. Should grinding amount L1
By determining the finish grinding amount L4 from the grinding amount L4 and processing the workpiece 21 by controlling the grindstone 10 according to the determined grinding amount L4, it is possible to accurately grind the workpiece 21 by a predetermined grinding amount L1. becomes. For this reason, the machining origin MO
Micro switch 25 is activated before the start of grinding to detect
The time-consuming work of aligning the outer peripheral surface of the roller 25b with the end surface 22a of the workpiece 21 is no longer necessary, and the setup time can be shortened accordingly, thereby improving the overall processing efficiency.

Further, since the grinding amount detection means does not come into contact with the grindstone 10, it does not wear out, and the workpiece 21 can be ground with high processing accuracy over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a grinding device according to the present invention. Figures 2 and 3 are diagrams showing how the grinding amount of a workpiece is detected using the grinding amount detection device of the grinding device, and Figure 4 is a diagram showing how the tip of the workpiece that has been ground is detected using the grinding device. Figure shown. Figures 5 and 6 use another example of the grinding amount detection device,
A diagram showing how the grinding amount of a workpiece is detected. FIG. 7 is a diagram showing yet another example of the grinding amount detection device. FIG. 8 is a diagram showing the main parts of a conventional grinding device. 1... Grinding device 2... Machine body 5... Work holding means (work mounting table) 10
... Grinding wheel 12 ... Grinding amount detection means (grinding amount detection device) 1
7... Grinding amount calculation section 19... Grinding wheel feed amount control section 21...
・Work appearance person Saibai Medical Industry Co., Ltd. agent Patent attorney Phase 1) Shinji Figure 4

Claims (2)

[Claims] (1) It has a machine body, and the machine body is provided with a workpiece holding means, and a grindstone is provided in a form that can be freely fed into the workpiece holding means, and the workpiece fixedly held on the workpiece holding means by the grindstone. , in a grinding device capable of grinding a predetermined amount, a grinding amount detection means for detecting the amount of grinding of the workpiece is provided, and a difference between the grinding amount detected by the grinding amount detection means and the grinding amount that should be ground is calculated. A grinding device comprising: a grinding amount calculation section for controlling the grinding amount; (2) The grinding device according to claim 1, wherein the workpiece is a small-diameter rod-shaped object.