JPH0398755A - Polishing device - Google Patents

Abstract

PURPOSE:To correspond to various kinds of works to be polished or the inner diameter fluctuation of the work to be polished by providing a polishing member with the polishing tool at its tip and supporting the polishing member at a supporting part in such a way as to be changeable in its radially protruding length from the supporting part. CONSTITUTION:A polishing member 12 is rotated around a shaft part 10, and a polishing tool (wire brush) 16 provided at the tip of the polishing member 12 performs circular motion. A work to be polished (resin mold) 1 is polished by the slidable contact of the polishing tool 16 at this time with the inner surface of the work to be polished 1. In this case, the polishing member 12 is supported by a supporting part 11 in such a way as to be changeable in its radially protruding length. With this change, the rotational radius of the polishing tool 16 is changed, so that plural kinds of works to be polished 1 of different inner diameters or the work to be polished 1 of fluctuating inner diameter can be performed by one polishing member 12.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to puff cloths and brushes. The present invention relates to a polishing device that polishes the inner surface of an object to be polished, such as a resin mold, using a polishing tool such as a grindstone.

(Prior Art) For example, in a resin molding mold having a cylindrical shape, the inner surface thereof is polished to a mirror finish. Generally, equipment for this type of polishing includes a motor,
A polishing tool such as a circular puff cloth is attached to the output shaft of a rotary drive mechanism from a speed reduction mechanism, etc., and polishing is performed by rotating the polishing tool while bringing the outer circumference of the puff cloth into contact with the inner surface of the resin mold. What is served is exactly as it should be.

(Issue 8 to be solved by the invention) By the way, in the above-mentioned polishing device, the diameter of the polishing tool attached to the output shaft is fixed, so when the inner diameter of the polished object is different, Polishing work is performed by changing the polishing tool depending on the object to be polished. For this reason, when performing polishing work, there is a problem in that a large number of polishing tools of different sizes must be prepared for each type of object to be polished.

In addition, even if there is only one object to be polished, if the inner surface of the object is tapered or the inner diameter varies in the axial direction, one polishing tool cannot cover the entire surface. Polishing work often cannot be done properly. In other words, if the size of the polishing tool is selected in accordance with the large diameter part of the object to be polished, there is a risk that the pressing force against the inner surface of the small diameter part will be too large, causing excessive wear and damage. , On the other hand, if the polishing tool size is adapted to small diameter parts,
The pressure contact force in a large portion of the diameter is too small, resulting in insufficient polishing. Therefore, when polishing a surface whose inner diameter is not uniform in the axial direction, it is necessary to change the polishing tool during the work for one object to be polished, which causes the problem that the polishing work is troublesome and time consuming. was there.

The present invention has been made in view of the above circumstances, and its purpose is to enable one type of polishing tool to cope with differences in the types of objects to be polished or variations in the inner diameter, and to simplify polishing work. Our goal is to provide polishing equipment that can.

[Structure of the invention]

(Means for Solving the Problems) The polishing device of the present invention is a device for polishing the inner surface of an object to be polished having a hollow portion using a polishing tool such as a puff cloth, a brush, or a grindstone, and is rotated by a rotation drive mechanism. In the shaft part,
A support part is provided to be inserted into the hollow part of the object to be polished, and a polishing member having a polishing tool at the tip thereof is attached to the support part so that the length of the polishing member protruding from the support part in the radial direction can be freely changed. It is characterized by its support.

(Function) According to the above means, the polishing member rotates around the shaft portion, and the polishing tool provided at the tip of the polishing member rotates in a circular motion. At this time, the object to be polished is polished by sliding the polishing tool against the inner surface of the object to be polished.

In this case, since the polishing member is supported by the support portion so that the protrusion length in the radial direction can be changed, the rotation radius of the polishing tool can be changed by changing the protrusion length in the radial direction. This makes it possible to polish a plurality of types of objects to be polished, such as holes with inner diameters, or objects to be polished with varying inner diameters, using one polishing member.

(Example) An example of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a resin mold 1 as an object to be polished is
For example, it is made of stainless steel and has a substantially cylindrical shape with a hollow portion 2. In this case, the inner surface 1a of the resin oval mold 1 defining the hollow portion 2 has a generally tapered shape whose diameter gradually increases toward the top, as shown in the figure.

Next, a polishing device 3 for polishing the inner surface 1a of the resin mold 1 to give it a mirror finish will be described.

The polishing apparatus 3 according to this embodiment includes a polishing object moving mechanism section 4,
Polishing mechanism section 5 and a control device 6 that controls the drive thereof
It is composed of etc.

As shown in FIG. 1, the polished object moving mechanism section 4 is composed of a pedestal 7 that is provided on a base (not shown) so as to be movable in the vertical direction, and a moving device 8 that moves the pedestal 7 up and down. . The resin mold 1 is fixed to the pedestal 7. The moving device 8 has a motor 8a.
The rotating shaft 8b is connected to the base 7 by a well-known ball screw mechanism, and the moving device 8 moves the resin mold 1 up and down with respect to the base. It is about to be moved. Further, as will be described later, the rotational speed of the motor 8a, that is, the moving speed of the pedestal 7 is controlled by the control device 6, and thereby the axial feed speed V of the resin/molding mold 1 is controlled. .

On the other hand, the polishing mechanism section 5 is configured to rotationally drive a shaft section 10 extending in the vertical direction in the figure by a rotational drive mechanism 9 consisting of a polishing motor 9a and a deceleration mechanism 9b fixedly provided to the base. has been done. A support portion 11, which will be described later, is provided at the tip (lower end) of the shaft portion 10, and a polishing member 12 is provided on this support portion 11.

The support part 11 is pressed into the hollow part 2 of the resin mold 1, and the rotation of the shaft part 10 causes the polishing member 12 to polish the inner surface 1a of the resin mold 1. It has become.

Further, the rotational speed (angular velocity ω) of the shaft portion 10 is controlled by the control device 6 as described later. Although not shown in detail, the polishing mechanism section 5 is provided with an abrasive supply section 13 for supplying an abrasive such as a polishing liquid to the inner surface 1a of the resin mold 1.

Now, the support portion 11 and the polishing member 12 will be described. The support portion 11 as a whole has the shape of a flat cylindrical container whose interior is divided into two upper and lower chambers.

Inside the upper chamber, as shown in FIG.
A housing portion 14 is formed that extends in the diametrical direction with respect to the axis of the housing 14 and opens on the left end side in the figure. A slider 15 having a hook-shaped retaining portion 15a (see FIG. 1) at its base end is slidably accommodated in the storage portion 14, and a polishing tool 16 consisting of a wire brush is attached to its tip. is attached removably. Incidentally, when this polishing tool 16 is attached to the slide par 15, it is freely rotatable in the direction of arrow B about the pin 16a. In addition to this wire brush, the polishing tool 16 includes a puff cloth, a whetstone, a water whetstone, and the like.

The polishing member 12 according to the present invention is the slide par 15 described above.
and a polishing tool 16 attached thereto, and therefore, this polishing member 12 is supported so as to be slidable in the radial direction on the support portion 11 with the base end side of the slider 15 inserted into the storage portion 14. It is in the form of Thereby, the protrusion length of the polishing member 12 from the support portion 11 can be changed freely. In addition, this protrusion length is
The retaining portion 15a of the slider 15 is connected to the storage portion 14.
At this time, the retaining portion 15a turns on a microswitch 17 disposed on the inner edge of the opening. On the other hand, an optical distance sensor 18 for detecting the protruding length of the polishing member 12 is provided at the base end within the storage portion 14 .

As is well known, the distance sensor 18 detects the distance to the slide par 15 by emitting light from a light emitting part (not shown) onto the end surface of the slide par 15 and receiving the reflected light. . In the above configuration, the lower chamber of the support part 11 is also provided in a position different from the upper chamber by 180 degrees, and therefore, the two polishing members 12, 12 are provided in the support part 11 on both sides. They protrude from each other and are supported so that their respective protrusion lengths can be changed in the radial direction.

On the other hand, the control device 6 includes, for example, a microcomputer, and as shown in FIG. , display section 23, etc. Of these, one data storage/readout section stores the type of polishing tool 16 that is most suitable for the material of the object to be polished and the desired surface roughness, determined in advance empirically or experimentally.
The mass of the polishing tool 16 is m. The optimum polishing force (pressing force) f and the optimum feed rate coefficient k for the polishing tool 16 are stored in a table form. As will be described in detail later, the feeding speed V of the resin mold 1 by the moving device 8 and the rotational speed ω of the shaft portion 10 by the rotary drive mechanism 9 are determined based on the processing data manually inputted from the input operation section 22. The polishing operation of the inner surface 1a of the resin mold 1 is automatically performed under control.

Next, the operation of the above configuration will be explained.

To perform the polishing work, the operator first inputs machining data such as the material and desired surface roughness for the resin mold 1, which is the object to be polished, from the input operation section 22 to the control device rI16. As a result, the polishing tool 16 and feed rate coefficient k corresponding to the machining data are read out from one data storage/reading section, and the type of polishing tool 16 is displayed on the display section 23.
will be displayed. The operator uses the polishing tool 1 based on the display.
6 (wire brush) is attached to the slider 15, the resin mold 1 is fixed to the pedestal 7, and the pedestal 7 is moved up and down manually, for example, so that the polishing member 12 is attached to the resin mold 1.
Set it so that it is located at the lower end inside the hollow part 2.

Then, by turning on a start switch (not shown), the polishing work is started. This polishing work is performed by rotating the shaft portion 1o in the direction of arrow A, for example, and moving the base 7 downward, as shown in FIG. At this time, due to the centrifugal force caused by the rotation of the shaft portion 10, the polishing tool 16 at the tip of the polishing member 12 is moved into the resin molding mold.
It protrudes in the radial direction from the support portion 11 until it comes into contact with the inner portion 1a of the support portion 11. In this state, the polishing member 12 rotates around the shaft portion 1O, and the polishing tool 16 at its tip moves circularly while slidingly contacting the inner surface 1a, thereby polishing the inner surface 1a of the resin mold 1. At the same time, the polishing tool 16 is moved downward by the moving device 8 to move the resin mold 1 downward.
relatively rises on the inner surface 1a. With this relative rise, the inner diameter of the hollow part 2 gradually increases, but the polishing member 12 can slide inside the storage part 14 and freely change the length of the protrusion in the radial direction from the support part 11. The polishing tool 16 always comes into sliding contact with the inner surface 1a of the resin mold 1 due to centrifugal force, and polishes the entire inner surface 1a while changing the radius of rotation r according to the shape of the inner surface 1a. When the polishing to the upper end of the inner surface 1a is completed, the polishing member 12 comes off the inner surface 1a and protrudes to the maximum amount due to centrifugal force, and at this time, the retaining portion 15a of the slider 15 turns on the micro switch 17. The polishing device 3 stops.

During this polishing work, the inner surface 1 is
The abrasive is supplied to a.

In the course of this polishing work, the control device 6 controls the rotation speed ω of the shaft portion 10 and the feed speed V of the resin mold 1 as follows, so that the entire inner surface 1a is uniformly coated. Polished.

That is, as described above, one data storage/readout section of the control device 6 stores the polishing force (pressing force) f and the mass m1 of the polishing tool 16, the material of the resin mold 1, and the desired surface roughness. Data of the feed rate coefficient k is stored. As shown in FIG. 3, the rotational speed control section 20 first controls the support section 11.
The current rotation radius r of the polishing member 12 (inner diameter of the part of the resin mold 1 being polished) is calculated based on an input signal from a distance sensor 18 provided at the position. Next, from the obtained rotation radius ``, the mass m of the polishing tool 16 of the data storage/reading section 20, and the optimum polishing force f, the angular velocity ω for obtaining the optimum polishing force f is calculated. in this case,
For example, in an ideal state, polishing force f is considered to be equivalent to centrifugal force, so ω is calculated from the centrifugal force equation f-mrω2. The rotational speed control section 20 outputs an output signal corresponding to the obtained angular velocity ω to the rotational drive mechanism 9, and rotates the shaft portion 1O and thus the polishing tool 16 at the angular velocity ω. This angular velocity ω gradually changes depending on the variation of the rotation radius r of the polishing member 12, and the angular velocity ω is large in the small diameter part of the resin mold 1 [1a], and the small angular velocity ω is in the large diameter part. The polishing member 12 is now rotated. As a result, the polishing work is always performed with the optimum pressing force of the polishing tool 16.

Then, the feed speed control section 21 determines the optimum feed speed V from the angular velocity ω determined by the rotation speed control section 20 and the feed speed coefficient k of the data storage/reading section.
(the descending speed of the resin mold 1) is calculated. This is determined by the formula v-kω, and the feed speed control section 21 outputs an output signal corresponding to the value of this feed speed V to the moving device 8, thereby moving the resin or mold 1 at the speed V. lower it.

This feed rate V also gradually changes according to the angular velocity ω and thus the rotation radius r, and the polishing member is polished at a large speed V at a small diameter portion of the inner surface 1a of the resin mold 1 and at a small speed V at a large diameter portion. 12 is phase. In contrast, it will be sent upward. Thereby, the inner surface 1a of the resin mold 1 is polished while keeping the sliding contact time (polishing time) of the polishing tool 16 constant per unit area.

Therefore, by controlling the rotational speed ω of the shaft portion 10 and the feed rate V of the pedestal 7 as described above, the polishing force f and polishing time per unit area on the inner surface 1a of the resin mold 1 are always kept at optimum constant values. As a result, the entire inner surface 1a is uniformly polished.

In this way, according to this embodiment, the polishing member 12 is
Since the protrusion length in the radial direction from 1 can be changed,
The radius of rotation of the polishing tool 16 can be changed, and one polishing member 12 can polish the entire inner surface 1a of the resin mold 1 whose inner diameter varies. Therefore, unlike the conventional method in which a large number of polishing tools of different sizes had to be prepared for each type of workpiece, one size polishing tool 16 is used for different types of workpieces. It is possible to correspond to In addition, the inner surface 1a of the object to be polished 1
Unlike conventional polishing tools, where the polishing tool had to be replaced mid-way even when the inner diameter fluctuated due to the approximately tapered shape, the polishing tool 1
6 is not necessary, and the polishing work can be facilitated and the time can be shortened.

Furthermore, especially in this embodiment, as described above, the control device 6
Depending on the material of the object to be polished and the desired surface roughness,
Advantages such as being able to select the optimum polishing tool 16 and automatically performing the polishing work with the optimum polishing force f and polishing time per unit area can be obtained. In this case as well, even when the inner surface 1a of the object 1 to be polished is substantially tapered and the inner diameter varies, the rotational speed (angular velocity ω) of the shaft portion 10 and the feed speed V of the pedestal 7 are determined by the polishing force f per unit area. The polishing time and polishing time are always controlled to an optimal constant value, and as a result,
Even and uniform polishing is performed over the entire inner surface 1a.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and for example, instead of moving the pedestal 7, the polishing member side may be moved relative to a fixed object to be polished; The rotating speed of the shaft portion and the feeding speed of the object to be polished do not necessarily have to be set at $1111, and can be implemented with appropriate changes within the scope of the gist.

[Effects of the Invention] As is clear from the above explanation, according to the polishing apparatus of the present invention, a single polishing tool can cope with differences in the types of objects to be polished or variations in the inner diameter, and can even be applied to various types of objects. This has excellent effects in that it is not necessary to prepare a polishing tool and the polishing work can be simplified.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a partially longitudinal front view of the overall configuration, Fig. 2 is a cross-sectional top view showing the support section, and Fig. 3 shows functions within the control device. It is a block diagram. In the drawing, 1 is a resin mold (object to be polished), 1a is an inner surface, 2 is
3 is a hollow part, 3 is a polishing device, 4 is a polished object moving mechanism part, 5
1 is a polishing mechanism, 6 is a control device, 8 is a moving device, 9 is a rotary drive mechanism, 1o is a shaft portion, 11 is a support portion, 12 is a polishing member, and 16 is a wire brush (polishing tool). Figure 7 2

Claims (1)

[Claims] 1. A device for polishing the inner surface of a workpiece having a hollow part using a polishing tool such as a buffing cloth, a brush, or a grindstone, which includes a shaft part rotated by a rotational drive mechanism, and a shaft part provided on the shaft part to be polished. The polishing member includes a support part that is inserted into a hollow part of an object, and a polishing member that has the polishing tool at its tip and is supported by the support part so that its protrusion length in the radial direction from the support part can be freely changed. A polishing device characterized by: