JPS59107849A - Belt type grinding device - Google Patents

Abstract

PURPOSE:To permit a smooth grinding adapted to the curvature of a work by a method wherein a pushing roller, whose axial angle is changeable, is equipped and the variable amount of the axial angle is transmitted to a regulating roller through a control mechanism so as to be capable of absorbing the fluctuation or the like of the tension of the grinding belt. CONSTITUTION:A prime mover 20 is disposed on a base 10 and one of a pair of idlers 20, attached to both sides of the root of the base, is made pivotable through a belt 30. The idler 45 is provided at the head top side of the base 10 as a grinding surfaces and the regulating roller 50 is provided at the side part of the base 10 as a non-grinding surface respectively while the grinding belt 30 is wound around the idlers 20, 45 and the regulating roller 50. A pair of pushing rollers 60 are provided on the base 10 respectively between the idler 45 and the regulating roller 50 so as to be capable of changing the axial angles with respect to the base 10 and the inclinations of respective pushing rollers 60 are detected by a detector 70. The axial angle of the regulating roller 50 may be changed by a regulating mechanism including a slider 54 and a motor 59 through a control device 75 in accordance with the inclination of the shaft 64.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to a belt-type grinding device in which an abrasive belt is given the ability to follow the curved surface of a surface to be ground, and in particular, to This article relates to a belt-type grinding device with high winding stability.

[Prior art]

Conventionally, devices for belt-type grinding of curved surfaces have mainly been based on a contact roll method.

This device receives the abrasive belt with a contact wheel,
This wheel is pressed against a curved surface for grinding.

However, in this conventional grinding device, in order to cause the abrasive belt to follow the shape of a curved surface, the attitude of the entire device must be tilted so as to follow the curved surface.

Therefore, the movement of the arm mechanism (for example, manipulator) that operates the device requires a movement range equal to the arm length multiplied by the inclination angle, and this movement range becomes large for a surface with a small curvature. Moreover, in this case, high speed operation is also required.
In some cases, the operating range and operating speed may be exceeded.

Furthermore, in this type of apparatus, the roll winding portion of the polishing belt comes into line contact with the surface to be ground, so the contact area between the polishing belt and the workpiece is generally small.

Furthermore, there is a possibility that the surface following function for minute changes in the curved surface is insufficient, resulting in some parts not being ground.

[Purpose of the invention]

In view of these circumstances, the present invention makes it possible to make the abrasive belt follow the curved surface of the part to be ground with good response and in detail, and also to increase the contact area, thereby improving grinding efficiency and operability. Our purpose is to provide belt-type grinding equipment.

[Summary of the invention]

In the belt-type grinding device according to the present invention, a pressing roller that presses the abrasive belt from the back side is provided on the blade top portion as the grinding surface of the base with a variable axis angle, and a side portion as the non-grinding surface of the base is provided with a pressing roller that presses the abrasive belt from the back side. Further, an adjustment roller that applies tension to the polisher belt from the back side is swingably provided at a position close to the pressing roller, and the axis angle of this adjustment roller is made to correspond to the axis angle of the pressing roller, so that the belt can be rotated in the opposite direction. The above object is achieved by a configuration comprising an electrical or mechanical control device for setting the inclination.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In the belt-type grinding device according to this embodiment, a prime mover 20 is mounted on the upper center of a base 10 that forms an operating head, that is, a main body support beam. A prime mover 20 is attached to one of a pair of idlers 40 attached to both sides of the base of the base 10.
The power from the transmission belt 30 is transmitted through the transmission belt 30. An abrasive belt 90 is wound around the idler 40, and this abrasive belt 90 is further wound around another idler 45 attached to the top side of the head serving as the grinding surface of the base 10. And the abrasive belt 9
0 is pressed from the back side with a pair of pressing rollers 60 installed at a constant interval on the top of the head of the base 10, so that the part between the pressing rollers 60 of this polishing bell) 90 is brought into surface contact with the grinding surface of the workpiece. I have to.

Each push-down low'near 60 is provided on the base 1o so as to have a variable shaft angle. That is, both ends of the shaft 64 are supported by each pair of rods that protrude from the base 1o as desired. And each pair of mouths, Rad 63
are connected by a link arm 65, and this glue/
The center part of the farm 65 is supported in a seesaw manner by a fixed roller 6.

The vicinity of both ends of the link arm 65 are pressed by compression coil springs 67 in the direction in which the pressing roller 6° projects. A measuring device 70 is provided on the side opposite to the roller of each rod 63 to detect the inclination of the shaft 64 of the pressing roller 60.

On the other hand, the back surface l of the abrasive belt 90 is placed on the side portion of the base 10 as the non-grinding surface and in a position close to the pressing roller 6o.
An adjustment roller 50 that applies tension from l111 is swingably provided. That is, the adjusting roller 50 is supported at both ends of a shaft 51 by rods 52 and 53, respectively. Each of the rods 52 and 53, like the rod 63 of the push-down roller 60, is supported by the base 10 via a link arm 55 and a fixed rod 57 so as to be able to see-saw. One rod 52 is connected to a slider 54 that slides using the base 10 as a guide. This slider 54
is screwed together with a rotating shaft 59A connected to a motor 59, so that a sliding force can be applied.

Further, the other rod 53 is supported by the base 1o via a compression coil spring 58 and a damper 56.

The adjusting roller 50 is controlled by an electric control mechanism so that its axial angle corresponds to the axial angle of the pressing roller 60.
The slope is set in the opposite direction to 0. That is, a measuring device 7o for measuring the displacement of each rod 63 is placed on the opposite side of the rod 63 supporting both ends of each pressing roller 6o. Control each of these measuring instruments 7o (foundation)
This control device 75f is connected to the device 75 and further includes a motor 5 for driving the rod 52 that supports one end of the adjustment roller 50.
Connected to 9. Then, when the measuring device 7o detects the inclination angle of the pressing roller 60, based on the input signal of the angle change, the adjustment roller 50 absorbs the tension change in the longitudinal direction and the width direction of the polishing bell 90.
The amount of adjustment of the inclination of the adjustment roller 50 is calculated by the control device 75, and based on the calculation result, the motor 59 is configured to tilt the rotation side of the adjustment roller 50 so as to give the inclination of the adjustment roller 50 in a direction opposite to that of the pressing roller 60. In addition, since the polishing pel 90 wound between the pair of pressing rollers 60 is actually in surface contact with the workpiece, the control device 1i7
The measured value manually inputted in step 5 is the sum of the inclination amounts of the pair of pressing rollers 60. In this way, by giving the adjustment roller 50 an inclination in the opposite direction to the pressing roller 60, the tension in the longitudinal direction and the width direction of the abrasive belt 90 is made uniform.
It is designed to provide stable rotational movement of the polishing pel 1-90.

Note that between the adjustment roller 50 and one idler 40,
A tension roll 80 is arranged so that the overall tension of the abrasive belt 90 can be maintained constant. That is, this tension roll 80 is configured such that a support rod 81 is elastically pressed toward the surface of the polishing belt 90 from the back surface side at the non-grinding position by a compression coil spring 82.

According to such a configuration, when the grinding surface is a flat surface, during grinding, the abrasive belt 90 undergoes deflection, tension, etc. due to tension in the belt length direction. These adjustments are performed by a tension roll 80 installed at the center of the base 10 and on the side where the adjustment row 250 is attached.

Next, a case where the grinding surface forms a three-dimensional curved surface will be explained. Incidentally, for the general curved shape of the entire workpiece, the pace 10 can be supported and operated by an appropriate arm mechanism, for example, a manipulator. On the other hand, it is necessary to make the polishing belt 90 follow the grinding surface of the work relatively quickly in response to changes in the shape of the minute curved surface of the work. In this case, the pressing row 260 tilts to follow the change in the curved surface of the workpiece in the width direction of the polishing belt 90 and follows the grinding surface of the workpiece.

Note that the grinding surface of the abrasive belt 90 comes into surface contact with the workpiece between the valley pressing rollers 60. Here, the pressing roller 60 and
Since the grinding surface of the polishing belt 90 is inclined to follow the curved surface, the belt tension in the polishing belt 90 is uneven in the width direction and the longitudinal direction, and is subjected to an action in the direction of falling off from the idler 40.45'N.

Then, the amount of change in inclination is detected by the measuring instrument 70 provided on the pressing roller 60, and this amount of change is transmitted by the control device @75 to the pressurizing motor 54 of the adjustment roller 50 as an input amount of inclination of the adjustment roller. An adjustment operation for uneven belt tension in the belt width direction is performed.

Here, the amount of adjustment of the adjustment roller 50 based on the amount of change of the ITP roller 60 can be roughly divided into three patterns depending on the type of inclination of the pair of pressing rollers 60, as shown in FIGS. 4 to 6. It can be considered separately. The input element for the amount of movement of each pressing roller 60 is the rod 6 at each end of the preceding pressing roll 50A.
3 movement xI.

x2 and rods 63 at each end of the subsequent pressing roll 50B
It consists of the amount of movement x3+X4. Based on this measurement j1, the damping device 75 calculates one pattern of the inclination of the pressing row 260, and adjusts the amount of adjustment of one end of the adjustment row 250 to the pressure section (v=f(Xl).

X2 + xa l x4 ) ) is given according to each pattern.

As an example, the relationship between the amount of change and the amount of adjustment for each pattern in the case of two pressing rollers will be described.

(1) Pattern (2) (FIG. 4) This pattern is a case where only one of the pressing rollers 60, ie, the rear pressing roller 60B or the front pressing roller 60A, is inclined. Now, assume that the subsequent pressing row 260B is tilted by θ. In this case, if the detection value of the pressing roller movement amount by the measuring device 70 is X3 + X4 and the distance between the bearings is B, the inclination angle θ of the pressing roller 60B is θ = (Xz -
)/B. The inclination βX to be set for the adjustment roller 50 based on the inclination of the pressing row 260B is β
! Connie! θ = f(v) (K!: slope coefficient>1) (v amount of movement of the varnish slider 54). In this way, the adjustment roller 50 is inclined in the opposite direction to the direction of inclination of the pressing roller 60B, and the angle of inclination is also larger than that of the pressing roller 60. Note that the slope coefficient is the tension of the polishing belt 90.

Determined by circumferential length, material, etc. In addition, if only the previous pressing row 260B is tilted, θ=(xtX
2) /B, and βlf can be set in the same manner as above.

(2) Pattern ■ (Figure 5) This pattern is for the front and rear pressing rollers 60A.

60B are both inclined in the same direction. The inclination angle of the front roller 60A is 0 times, and the inclination angle θ of the rear roller 60B!
Then, since θl and θ2≧0, θt = (
X+ X11 )/B% θ2=(xs −
It is given by (x4)/B. Therefore, β of the adjustment roller 50 is given by β□=− minus □(θ1+θ).

Here, the slope coefficient K ]IId is given as 1 for K I[≦.

(3) Pattern river (Figure 6) This pattern is for the front and rear pressing rollers 60A.

This is a case where 60B is reversed. When θL≧O1θ2≦0, the inclination angle of each roller is θt=xt−(m to 2/8).
=Xs Xa /B is given.

Therefore, the inclination β■ of the adjustment roller 50 is β■=-Km (
It is given by θ1+θ2). Furthermore, θ! , 02, the value of θ + θ1 and 0 can be obtained, and θ1 and 02
It is the value obtained by multiplying the difference by the slope coefficient.

As described above, the relationship between the amount of change and the amount of adjustment is given for each pattern, and based on this, if the inclination pattern of the pressing roller 60 is determined, the amount of adjustment of the adjustment roller 50 can be determined accordingly.

Note that adjustment of the belt tension in the longitudinal direction of the polishing belt 90 during curved surface grinding is performed by the tension roll 80 as in surface grinding.

In the above embodiment, the case where a pair of pressing rollers 260 is provided has been explained, but this shows a case where grinding efficiency is high due to surface contact.In some cases, only one pressing roller is provided to improve curved surface followability Of course, the present invention can be implemented as a belt grinding device for the sole purpose of belt grinding. In this case, the inclination angle θ of the pressing roller and the adjustment inclination β of the adjusting roller can be given by θ to β=-, using the same concept as the above-mentioned turn (2) in the case of two pressing rollers.

Moreover, it is also possible to use an apparatus having two or more pressing rollers. In this case, the adjustment amount β is given as β=−K(θ!+θ2+...+θ1), as in the case of two pressing rollers.

In addition, in the above embodiment, an electric means was adopted as the control device, but the present invention is not limited to such a device.
As shown in the figure, it is also possible to employ mechanical means using a link mechanism or the like.

That is, the rod 63 that supports each end of the shaft 64 of the pressing roller 60 is slidably supported by the head portion of the pace 10 (lower portion in FIG. 7) via a bearing 92, as in the above embodiment. The same is true for .

As a mechanical control device, this is performed by converting the amount of displacement and one direction of displacement of each rod 63 back to the adjustment row 250 using a rotatable arm 91 provided on the pace 10. Specifically, a pair of arms 91 are rotatably supported on the pace 10 by pins 94 serving as fulcrums, corresponding to each end of the pressing roller 60. The position of the fulcrum of the arm 91 can be adjusted by movably inserting a pin 94 into a long hole 91A provided in the arm 91. This arm 91 is formed into a substantially L-shape, and its substantially center portion is supported by the pin 94, so that each piece thereof is approximately 90 degrees from each other.
It is designed to move in directions that cross each other. and,
A link mechanism for detecting the inclination of the pressing roller 60 is connected to one piece of the arm 91. The link mechanism is the pressing roller 6
0, and a second link arm 97 that transmits the total displacement of the first link arm 96 to one piece of the arm 91. The first link arm 96 is connected to each pressing roller 6
Both ends thereof are connected to the rods 63 on each end side of 0, and the central part is connected to the second link arm 97. and the second
Link arm 97 is connected to one piece of arm 91 via pin shaft 97A. Note that a compression coil spring 67 is provided between the bearing 92 and the rod 63, and the rod 6
3, the pressing roller 60 is uniformly biased in the retreating direction from the abrasive belt.

On the other hand, each end of the shaft 51 of the adjustment roller 50 is connected to the other part of the arm 91 via a response rod 98.

The response rod 51, the tilt detection rod 63, and the second link arm 97 are arranged to be orthogonal to each other. Note that the rod 51 is slidably supported by the base 10 via a bearing 92A.

However, for example, to explain a case where the subsequent pressing roller 62B moves in the A1 direction in the figure during grinding, one end side of the first link arm 96 moves in the AI direction via the rod 63 connected to this pressing roller 60B. As the second link arm 97 rotates, the second link arm 97 moves in parallel (in the A2 direction). Therefore, the arm 91 rotates clockwise in the figure around the fulcrum pin 94, and one rod 9 of the adjustment row 250
8 in the orthogonal direction (direction B), that is, in the direction in which one end of the adjustment roller 50 is made to protrude. Therefore, the displacement of the pressing roller 60B is reversely returned to the adjusting roller 50 in a different direction via the arm 91, and, for example, the change in the tension of the polishing belt 90 is directly reflected by mechanical means. It becomes something that can be absorbed.

Note that the above description of the operation corresponds to the operation of pattern I in the case of the above-mentioned electric bowl device, but
The operations corresponding to pattern (2), pattern (2), etc. can be similarly performed via the link mechanism. Note that proportional adjustment of the displacement amount of the pressing roller 60 and the adjustment displacement amount of the adjustment roller 50 can be performed by adjusting the pin 94 for the fulcrum of the arm 91 along the elongated hole 91A.

〔Effect of the invention〕

As described in detail above, according to the present invention, the shaft angle of the pressing roller is made variable, and the amount of change in the shaft angle of the pressing roller is transmitted to the adjustment roller via the control mechanism, so that fluctuations in the tension of the abrasive belt, etc. can be absorbed. Therefore, it is possible to carry out smooth and reliable grinding work that conforms to the curved surface of the workpiece to be ground, without the need to give the base any unnecessary rotational motion. In addition, the response along the curved surface of the part to be ground is performed by the pressing roller part, and the large base can be operated without following the curved surface, so the curved surface following ability can be delicately defined over the details of the workpiece, Therefore, the operability and grindability can be greatly improved compared to conventional devices.

[Brief Description of the Drawings] Figures 1 to 6 show an embodiment of the present invention.
FIG. 1 is a front view showing a main part in partial section 1, FIG. 2 is a partial sectional view showing the pressing roller 60 (in use state), and FIG. 3 is a partial sectional view showing the response state of the adjustment roller. Figures 4 and 5
6 and 6 are functional explanatory diagrams for explaining the inclination pattern, respectively, and FIG. 7 is a perspective view of a main part showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Base, 40... Idler, 50... Adjustment roller, 60... Pressing roller, 75... Control device, 90... 6θ 2nd eye $4 7th eye

Claims (1)

[Scope of Claims] 1. An abrasive belt is provided on a base serving as an operating head for rotation b1 through a power mechanism and an idler, and the abrasive belt is attached to the back side of the blade top portion serving as the grinding surface of the base. A pressing roller that presses the abrasive belt from the back side is provided with a variable axis angle, and an adjustment roller that applies tension to the abrasive belt from the back side is swingable at a side portion of the base serving as a non-grinding surface and in a position close to the pressing roller. A belt-type grinding device, characterized in that it is provided with an electrical or mechanical control device that makes the axial angle of the A14 firefly roller correspond to the axial angle of the pressing roller and inclines in the opposite direction. 2. The belt-type grinding device according to claim 1, wherein the pressing rollers are mantissas arranged side by side with a constant interval between them.