JPS6029276A - Truing apparatus for angular-type grinding wheel - Google Patents

Abstract

PURPOSE:To enable truing in a uniform thickness on both sides of an angular- type grinding wheel, by obtaining the displacement of the grinding wheel surface after grinding work with reference to the position of the grinding wheel face measured immediately after the previously performed truing, and by adjusting the truing locus according to the above obtained displacement. CONSTITUTION:A contactor 6 is shifted by a drive mechanism 8 until it comes in contact with a face of an angular-type grinding wheel 20 and the amount of the shift is detected by a detecting sensor 10 and stored in the store 14 via a detecting portion 12. From the amount of the shift of the contactor 6 which was obtained at the measurement performed just after the previous truing and the amount of the shift of the contactor 6 obtained just before the truing at this time, the displacement of each of the faces of the grinding wheel 20 with reference to that obtained immediately after the previous truing is provided by a displacement detectng portion 16. Based upon the displacement, a locus for the truing tool 2 to make the truing by grinding a uniform thickness off each of the grinding surfaces immediately before the truing at this time is provided by a control protion 18. The tool 2 is shifted according to the thus obtained locus.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for accurately truing each ?111 cutting surface of an Anguicolaba! grinding wheel.

[Prior art]

In recent years, so-called CBN Iff Ei wheels have come into use that use hard grains such as mononitride as abrasive grains. CB N hf (Since stone wheels are extremely expensive, when truing the grinding surface, it is best to keep the depth of cut of the truing tool to the minimum necessary to remove the waviness of the grinding wheel, and to prolong the life of the grinding wheel.) On the other hand, if the depth of cut is too small, it may not be possible to completely remove the waviness on the grinding surface, which may have a negative effect on grinding accuracy. In the truing device d3, it is necessary to limit the cutting distance of the truing tool with an accuracy of about a few μm.

However, in reality, the grinding wheel expands thermally due to changes in air temperature, etc., and the position of the grinding surface changes.

Furthermore, 11! (The stone wheel (1J) causes minute wear due to cutting, and the degree of this wear is not always constant. Therefore, before truing Based on the grinding surface of the grinding wheel
It is necessary to cut to a certain thickness. For this purpose, it is necessary to accurately measure the position of the (σ1 ground surface) before truing.For this purpose, a contact sensor is used to detect the position of the ground surface, and this (1J1 ground surface is A method of grinding is used.

However, in the case of a so-called ngular type grinding wheel, which is inclined with respect to the normal direction of the grinding wheel and has two IC grinding surfaces, a single contactor is attached to the grinding surface. Even if the position of the grinding surface is detected by contacting it from the normal direction of the car, is it? Since the IIl cutting surface is inclined, the axial displacement due to the thermal expansion of the grinding wheel will affect the displacement in the normal direction of the 11J1 grinder, so the positions of both sides of the ω1 grinder will be Therefore, it is not possible to accurately grind the grinding wheel's true and ink to the specified angular shape using the conventional cylindrical truing device. It cannot be done.

[Purpose of illumination]

Therefore, the present invention has been devised to improve these drawbacks and improve both grinding surfaces of the angular grinding wheel. ′! The purpose is to provide a new truing device that can perform truing with a uniform thickness for polishing.

[47 of the light. forming/acting] FIG. 1 is a block diagram showing the concept of the present invention.

That is, the present invention (11)
A truing tool (2) that performs truing by cutting; a truing tool drive device (4) that can move the truing tool in the normal direction of the stone wheel and in the qql+ direction; A contactor (6) that contacts each (σ1 cutter and moves 1g), a contactor drive device (8) that moves the contactor 1g at least in the normal direction of the IJS stone wheel, and a 6it contact m: The signal from the contact detection sensor is input to a contact detection sensor (10) which is connected to the grinding wheel and detects stiff contact due to vibration etc. a contactor movement amount detection section (12) that detects the movement of the contactor by avoiding operation of the contactor drive device from its movement starting point until the movement of the contactor is detected; The memory unit (1
4) From the amount of movement recorded in the storage unit 1Q and detected immediately before truing, and the movement m detected immediately after the previous truing, calculate the amount of movement immediately before truing for each grinding surface of the grinding wheel immediately after the previous truing. A displacement detection part (16) detects the displacement of each grinding surface of the grinding wheel, and a Vll detected by the displacement detection part (6th period of the stone wheel).
By correcting the working locus of the truing tool during the previous truing, which is relative to the grinding surface of the grinding wheel immediately before truing, by the displacement of the grinding surface, each grinding surface of the grinding wheel immediately before truing is ground with the same thickness. Ink J: A truing control section (18) for controlling the truing tool drive device;
! 11'tl'ru.

Here, the angicola type grinding wheel refers to a grinding wheel that has two or more grinding surfaces that grind by line contact, and those grinding surfaces are inclined with respect to the normal direction of the grinding wheel.

The contact G is connected to the contact drive device 8 in the normal direction of the grinding wheel 20.
can be moved by. That is, by inputting the control signal of the contactor movement m detection unit 12, the contactor drive device 8 performs the following:
The contactor 6 can be moved in the normal direction from the origin of the drive device until it comes into contact with the grinding wheel 20. Determination as to whether the tip of the contact has contacted the grinding wheel 20 is based on a signal output from the contact detection sensor 10. When the contact detection signal from the contact detection sensor 10 enters the contact movement detection unit 12, the contact movement amount detection unit 12 instructs the contact drive unit 8 to stop the movement of the contact. In addition to transmitting a signal, the amount of movement of the contact is output to the storage unit 14,
The storage unit 141 stores the value.

In this way, the position of each grinding surface of the wheel is memorized depending on the amount of movement of the contact from the starting point of movement.

First of all, for each grinding surface of the grinding wheel that has completed truing, move the contact like a subordinate until contact is detected, detect the movement, and detect each (
σ [Memorize the position of the surface.

Next, point 11 [(When machining force is applied to a workpiece using a stone wheel, each grinding surface of the grinding wheel will be displaced due to thermal expansion in the radial and axial directions. Also, the grinding surface will change its original shape due to wear. It has a constant thickness (less thickness) than the ground surface after truing is completed.

Therefore, in this state, the contactor is changed to each (σ
The amount of movement of the contact is measured by moving the contact until it comes into contact with the milled surface by μm, and the surface of each milled surface immediately before truing is used as the moving claw of the contact, and the value is stored in the storage section 14. Note 10.

The displacement detection unit 16 detects the ground surface of each T+ll for each grinding surface Yj11 from the movement m of the contactor measured immediately after the previous truing and the movement claw of the contactor immediately before the current truing. Calculate the displacement by one standard. The truing control unit 18 controls each rtll.
From the surface of the grinder, LL (produced by the displacement in the axial direction of the stone wheel /j corrects the influence of the displacement of the grinding surface in the normal direction, and calculates the displacement of the grinding surface in the direction of the true normal I, Aim for the trajectory of the truing tool so that it grinds uniformly from each (σ1) cutting surface immediately before truing, and operate the truing tool according to the trajectory to perform the 18 functions.

The present invention consists of the above configuration.

〔Example〕

The present invention will be described below based on specific examples.

Figure 2 shows the true ink control section of this truing device,
FIG. 2 is a partial configuration diagram of the present device showing the relationship between the truing tool drive device and the grinding wheel. FIG. 3 is a partial configuration diagram of the present device showing the relationship among the truing tool drive device, the contact, the contact drive device, and the grindstone. Moreover, FIG. 4 is a partial configuration diagram of the present device showing the relationship between the contactor, the contactor drive device, and the grinding wheel.

The grinding wheel head 210 has a magnet @2 which is the rotating shaft of the grinding wheel 20.
Rotate 01 E) + Fluid bearing that freely supports the shaft Metal 20
7 are arranged. ? 11 (The other end of the 6-shaft 201 is provided with a pulley 202 that transmits rotational force, and the power is transmitted by a drive (not shown) [--) to rotate the calm stone wheel 20.

On the other hand, the flange 206 (installed in the medium heat section of the 1dl+stone shaft 201) engages with the movable block 205, and the movable block [
A fluid thrust bearing is formed between the lug 205 and the flange 206. The movable block 205 is screwed into a feed screw 204, and the feed screw 204 is directly connected to the rotating shaft of the Ribo Tanabata 203 for moving the grindstone shaft 201 in the axial direction. Therefore, when the servo motor 203 is rotated, the feed screw 20=1 rotates, and the movable block 205 that is threaded therewith moves in the axial direction of the feed screw 204.

Therefore, the grinding wheel shaft 201 can receive the moving force from the movable block 205 and move in its axial direction, and the grinding wheel can be moved in the same direction.

In addition, a truing:L tool drive unit is installed on the whetstone head 210.A support stand 405 is installed on the whetstone head 210.
is fixed, and a guide stand 410 is provided above the support stand 405 to enable movement of the rubber stand 409 in the direction of the grindstone axis.

]11~Rubber 40 is 1-Rubber cylinder 40
7, it can be moved in the direction of the grindstone axis. The truing tool 2 is placed on the traverse table 409.
An advancing/retracting table 407 is provided so as to move by 1!7 in the normal direction of 0. A cutting ram 403 is installed in the inner center hole of the advancing/retracting table 407.
3 is the center 1 of the V-Bomi-Yu 402 that controls the depth of cut.
It is threaded with the feed screw directly connected to 111. The support head 4, 01 that supports the truing tool 2 by the rotation of the servo motor 402 moves forward and backward in the radial direction of the grinding wheel.
It is designed to be able to move relative to 7. or,
A pilot pen 408 is provided at one end of the advancing/retracting table 407, and the pilot pen 408 engages with the templates 1 to 406 fixed to the support table 405. Also, advance/retreat platform 4
A piston is installed on the flange of 04, and this piston interacts with the cylinder 4-8-6.
The force for pressing the pen 7108 onto the tracing surfaces of the templates 1 to 406 is transmitted. When the traverse cylinder 407 is operated and the rubber bases 1 to 409 are operated, the truing tool 2 moves in the direction of the grinding wheel axis, and also moves in the radial direction of the grinding wheel to the shape of the temple plate 406. Therefore, the shape of the temple plate 406 is changed to the shape of the wheel 1 by the action of the plate 406. ω1
If the J3 GJ is made in the same shape as the sharpener, it can be trued to the same shape on the grinding wheel's rill sharpener.

Next, the contactor and the contactor drive device will be explained. FIG. 4 is a diagram showing its configuration. A support stand 801 for fixing the whetstone head 2'IO is stepped. On the support stand 801 is a guide member 8 extending in the axial direction of the grinding wheel shaft.
11 are stepped, and a sliding table 812 is engaged with the guide member 811. A guide cylinder 813 is disposed above the sliding table 812 to house the reciprocating ram 802. A reciprocating ram 802 is housed inside the guide cylinder 813, and the reciprocating ram 802 is engaged with a feed screw 803. The feed screw 803 is directly connected to the central axis of a forward/backward servo motor 804, and when the servo motor 804 rotates, the forward/backward ram 802 moves forward or backward in the normal direction of the grinding wheel. Further, in the shift cylinder E310, a piston disposed therein is coupled to a sliding table 812, and the sliding table 812 is fixed to the guide member 811 to move the IM. Therefore, by operating the shift cylinder 810, the contactor can be moved in the axial direction within the grinding wheel, and by operating the turbo motor 804, it can be moved in the normal direction. At the tip of the advancing/retracting ram 802, there is a first contact part 6a and a second contact part 6a shaped as shown in the figure.
A contact 6 is provided on the right side of the 1f1 contact portion 6b, and a vibration sensor 10 is connected to the contact 6.

FIG. 5 is a configuration diagram showing the configuration of the electrical system of this device. Control of this control device is performed by an electronic milking machine. An electronic computer is a CI) U 30, an interface 33, 34 and a memory 3 interposed between it and input/output equipment.
It consists of 5. Also connected to the CPU 32 is a detection circuit 32 which receives signals from the data input device 31 and the vibration sensor and detects contact between the contactor and the grinding surface. The drive IJJ unit 3G, 37.3ε3 for driving each ribo dryer 203, 402, 804, and three hydraulic control circuits for driving each hydraulic cylinder are connected to the CPU.

FIG. 6 is a flowchart illustrating the method by which the Wood 81ty machine processes. Furthermore, FIGS. 7 and 8 are diagrams illustrating the principle of detecting the surface level of the cut surface in stone using this contactor.

Steps 100 to 116 include il (each one of the stone wheels)
, Jl cutting surface 0a and 2011, this is a step for detecting the position of the contact relative to the origin, and the contact movement F
5 detection section. J to the arrangement shown in Figure 7(a)
3, the first contact part 6a abuts the grinding surface 20a when the contactor 6 is moved in the U-axis direction indicating the direction toward the center of the normal direction of the grinding wheel, and the J ,
to move. When contact is made, the contact drive device is stopped and the feed m is stored as MR in step 104. That is, this MR value represents the position of the rtll cut surface 2 with respect to the origin of the contact.

After returning the contact to the origin in step 106, in order to measure the position of the grinding surface 20b, as shown in FIG. 7(b), the shift cylinder 810 is operated to move the contact. 6 to the left side by 1 t, and shift the second contact 61) in the X direction, that is, in the direction of the grindstone axis, to a predetermined position. Then, in step 110, in the same manner as described above, after feeding the contact until it makes contact, the feeding ■ is increased to N+? , how do I remember it? That is, the value of NR indicates the position of the ground surface 20b with respect to the origin of the contact. Thereafter, at step J3, the contactor 6 is returned to the origin.

In this way, the position of the grinding surface immediately before truing is detected as the movement of the contactor. Next, in step 118, the displacement of the feed m of the contact is determined. That is, as will be described later, in MO, No., each movement amount of the contactor measured immediately after truing the grinding surface of the grinding wheel in the previous truing process is recorded. -) So, each of each? Calculate the difference in position between tl1m and store the value at - as A and 1]. Step 118 is
This corresponds to the displacement detection section mentioned above. In Fig. 7(C), the position J3 (dotted chain lines 21a and 211) is immediately after the previous truing. This is what is shown.

Therefore, Δ and 13 were turned 81 in step 118, respectively.
The values are as shown in the figure.
, 20 b respectively represent the displacement in the direction of the glue axis (normal line). Also, each RDL grinding surface line 21c and 20 of the grinding wheel
If S is related to c, then Fig. (1)
Since the shift is 1~, the intersection line 20c is Δ× in the X-axis direction. Also, the 8th
As shown in the figure, the component Δ in the U direction of the displacement with respect to the intersection line 21c of the grinding machine immediately after the previous truing of the intersection line 20C of the surface 1'il1 is expressed by the following equation. - I can do it.

△X-(A-B) sin θ・cos θ ΔY”l3cos2θ10△5in2θ Here, in this embodiment, θ is set to 30 degrees.

Therefore, △x=v'/4・ (△-13> △Y=1/4・ (A-1-3B) Since the grinding wheel is displaced, in step 122, the servo motor 203 is driven to move the grinding wheel by one ΔX,
Regarding the X-axis direction, the intersection line 20c is made to coincide with the fill cut surface immediately after the previous truing. Next step 12
At 4, drive the 7' IO2 and move the true-ing go shell by ΔY 10 in the normal direction (Y-axis direction)
to move forward. That is, ΔY is the correct displacement of the grinding surface in the normal direction after correction, and C represents the thickness of the grinding wheel. If the position of this J: sea urchin truing machining is corrected with respect to the position of the previous truing ■1, the grinding wheel will grind to a thickness C with respect to the grinding surface of the FJ right next to that truing. I can do it. Next, in step 126, the traverse cylinder 407 is driven to grind the truing tool 2 to a predetermined locus while tracing the template 406 with the operating grinding wheel. After cutting ω1, the cylinders 1 to 407 for rubber are operated in the opposite direction to move the truing tool 2 to the origin position in the positive direction of the X-axis direction, and the truing is completed. Thereafter, in step 130, the grindstone head is advanced by ΔY+C in the normal direction. That is, by moving the ore table in this way, the relative distance of the grinding surface to the workpiece becomes the same as it was immediately after the previous truing.

In the next steps 132 to 14/I, the contact is moved in the normal direction to the ground surface immediately after truing. That is, in the truing 1u, the contacts are aligned and the measurement system is calibrated.Step 132.
134 is similar to steps 100.102 described above.

Further, in step 136, the detected moving chamber is stored in the MO as the surface of the riII cut surface immediately after the previous truing, which will be used in the next truing step 118 of the culm. In step 138, after returning the contact to the origin, the K or contact is shifted in the -X direction, and in step 140, for the other direction (201),
Measure the sending distance in the same way. (Directly, step 1/
12, it is stored as No. Next, step 144
Then, return the contact to the origin and finish. Through the above-described processing, the grinding wheel can correct errors caused by displacement in the axial direction and accurately true the grinding surface.

Based on the template used in the above example,
Instead of determining the truing trajectory, truing may be performed in a predetermined shape by NC control. That is, as shown in FIG.
The feed screws 903, 904 and the servo motors 901, 902, which can each move in the direction, may generate a -C truing locus laterally. In this case, instead of shifting the grinding wheel by △× in the X-axis direction as in this embodiment, as shown in FIG. △X1△Y for P1
You may supplement it with [].

Also, instead of sliding the rubber table 1 along the tray 1, it may be moved 18 times toward the tray 1.

〔Effect of the invention〕

In summary, the present invention is designed to reduce the displacement of the 1tll cutting surface of the grinding wheel i1i so that true ink can be uniformly applied to both grinding surfaces of the grinding wheel with a constant thickness even if the grinding wheel is displaced in the axial direction. The position of the grinding surface immediately after the previous truing is used as a reference, and the truing trajectory is corrected based on this displacement. Therefore, according to this device, the position of the grinding surface immediately after the previous truing is corrected. It is possible to accurately truing with a uniform thickness even if the stone wheel is displaced in the axial direction.Therefore, the service life of the 111°C stone wheel can be extended, and the workpiece can be lifted as quickly as 11". It is possible to do so.

[Brief explanation of drawings]

fi+-11'V++1 Ho K>Tl1l/7) IN combination *-++r1. There is a t-frl "t horn Fim-7". FIG. 2, FIG. 3, and FIG. 4 are configuration diagrams of a mechanical part of a truing device according to an embodiment of the present invention. Of these, Fig. 2 is a mechanism diagram showing the relationship between the grinding wheel and the truing tool drive device, Fig. 3 is a mechanism diagram showing the relationship between the contactor, the truing] bad breath drive device, and the grinding wheel. FIG. 2 is a mechanical diagram showing the configuration of a contact and a contact drive device. FIG. 5 is a configuration diagram showing the configuration of the electrical system of the device of this embodiment. Figure 6 shows flow diagrams 1 to 51 that show the processing of 51 calculations used in the same example. Figures 7 and 8 show the principle of the process of calculating the displacement of the ground surface. 9 is a configuration diagram of a truing tool drive device showing a modified example of the same embodiment, and FIG. 10 is an explanatory diagram of its operation. 2...Truing tool 1... Truing tool drive device 6... Contactor 8... Contactor drive device 9... Vibration sensor 12... Contactor movement detection section 14... Storage section 1G... Displacement detection section 18...・Truing Control Part Special R'l Applicant: Kanata JEki Co., Ltd. Agent: Patent Attorney: Hirodo Okawa Patent Attorney: Shudo Koboya Patent Attorney: Akio Maruyama Figure 2

Claims (3)

[Claims] (1) A truing tool that performs truing by cutting the (σ1 cutting surface of the grinding wheel by Iσ1); a truing tool drive device that moves the truing tool 1q in the normal direction and axial direction of the grinding wheel; a contact element that comes into contact with each grinding surface; a contact element drive device capable of moving the contact element at least in the normal direction of the grinding wheel; and detecting that the contact element has contacted the grinding surface of the grinding wheel. a contact detection range, and a signal from the contact detection range is input, and the contact drive device starts its movement until it is detected that the contact has contacted each grinding surface of the A contact moving star detection unit that detects the movement of the contact from a point tr-r, , affl, and the contact r-movement detecting unit are activated immediately before and immediately after truing, and each detected movement m is activated. a storage section for storing; and a storage section for storing information on each grinding surface of the grinding wheel immediately after the previous truing, based on the amount of movement stored in the storage section and detected immediately before truing, and the amount of movement detected immediately after the previous truing. a displacement detection unit that detects the displacement of each grinding surface of the grinding wheel; and a displacement detection unit that detects the displacement of each grinding surface of the grinding wheel, and a displacement of the grinding surface of the grinding wheel detected by the displacement detection unit to determine the relative position of the truing tool with respect to the grinding surface of the grinding wheel immediately before truing. a truing control unit that controls the truing tool drive device so as to perform truing with the same surface thickness of each grinding wheel immediately before truing by correcting the operating locus during the previous truing; Angular type grinding wheel truing device. (2) The contact has first and second contact tips that contact one each of the two grinding surfaces in the grindstone described in 11a, and these are formed in one direction, and the contact drives the contact. 2. The truing device for an angular grinding wheel according to claim 1, wherein the device includes one structure capable of moving in the axial direction of the stone wheel. (3) The relative trajectory of the truing is generated by tracing a starch μ-1 having the same shape as the shape of the grinding surface of the fourth generation stone wheel. Angi described in item 1: a truing device for an I-ra type grinding wheel. (/I) Correction of the relative trajectory of the truing is performed by avoiding movement in the axial direction of the grinding wheel, with respect to the axial direction of the grinding wheel,
With respect to the normal direction of the grinding wheel, the position of the truing worker relative to the grinding wheel should be moved in the normal direction. l*rThe truing device for an I-type grinding wheel according to claim 3.