TW201532730A - Pad for supporting grinding disk - Google Patents

Abstract

To suppress the increase in the heat generated in the grinding disk during grinding. The pad according to one aspect is a pad supporting a grinding disk by being affixed to a shaft of a grinding machine together with the grinding disk, the pad including a support surface opposing the grinding disk, a back surface opposing the support surface, and a plurality of air passages formed at a predetermined spacing along the circumferential direction of the support surface. At least a portion of each of the air passages penetrates from the support surface to the back surface. Each of the air passages is formed to the peripheral portion of the support surface.

Description

Mat for supporting the grinding disc

One aspect of the invention pertains to a pad for supporting a grinding disc.

Various types of grinders are known in the art, and one such grinder is a portable grinder. For example, Patent Document 1 describes an orbital sander driving device in which a drive shaft has a first end rotatably coupled to a rotating shaft and eccentric with respect to the rotating shaft, the rotating shaft being self-aligning a driving source extending from a driving unit, the driving shaft is eccentrically moved around a shaft core of the rotating shaft by rotation of the rotating shaft to orbitally move a bottom plate through a support column Supported by the drive unit, the support post is formed by an elastic member and is fixed to one of the second ends of the drive shaft.

Patent Document 1: Japanese Unexamined Patent Application Publication No. H8-309653.

A grinding disc is attached to a grinder, such as the orbital sander drive described above. The grinding disc is usually a fixed base material (made of cotton cloth, paper, or the like) by using an adhesive (adhesive, gelatin, synthetic resin, or the like) to fix the abrasive particles or fine powder to a flexible base material. The component obtained by one of the surfaces. Therefore, the research The adhesive portion of the abrasive disc or a portion of the base material portion may expand due to heat generated in the abrasive disc during grinding, thereby reducing the grinding efficiency and shortening the life of the abrasive disc. It is also possible that this expansion will cause undesired vibration of the grinding disc during operation, rendering the grinder difficult to use. Therefore, it is desirable to suppress an increase in heat generated in the grinding disc during grinding.

A pad according to an aspect of the present invention is a pad supporting a grinding disc, the pad being supported by the grinding disc together with a shaft of a grinder, the mat comprising a pair of support surfaces of the grinding disc, a pair of back surfaces facing the support surface, and a plurality of air passages formed at a predetermined interval along a circumferential direction of the support surface, wherein at least each of the air passages A portion penetrates from the support surface to the back surface and each of the air passages is formed to a peripheral portion of the support surface.

In this aspect, since the provided air passage penetrates from the support surface to the back surface and extends to the peripheral portion of the support surface, air continuously flows through the passage by centrifugal force, thereby being in the grinding disc At least a portion of the heat generated in the abrasive disk is discharged by the flow of the air as the pad rotates as the grinder operates. Therefore, the increase in heat generated in the grinding disc during grinding can be suppressed.

According to one aspect of the invention, the increase in heat generated in the abrasive disk during grinding can be suppressed.

1‧‧‧Portable Grinder

2‧‧‧ shaft

3‧‧‧ nuts

10‧‧‧ pads

10a‧‧‧through hole

10b‧‧‧Depression

11‧‧‧Support surface

12‧‧‧ Back surface

14‧‧‧ airway

14a‧‧‧End

14b‧‧‧End

20‧‧‧ grinding disc

1 is a schematic view showing the appearance of a portable grinder, the portable grinder There is a pad according to an embodiment.

2 is an exploded perspective view illustrating the attachment of the pad in accordance with an embodiment.

3 is a perspective view showing a support surface of the pad according to an embodiment.

4 is a perspective view showing a back surface of one of the pads in accordance with an embodiment.

FIG. 5 is a front elevational view showing a support surface of the pad according to an embodiment.

Fig. 6 is a graph showing the cumulative amount of grinding in the working example and the comparative example.

Fig. 7 is a graph showing the amount of polishing per 30 seconds in the working example and the comparative example.

An embodiment of the invention is described below with reference to the accompanying drawings. It is noted that in the following description, the same or equivalent components are designated by the same reference numerals and the description of the duplicates is omitted.

A structure according to one of the pads 10 of the embodiment is illustrated using Figs.

The pad 10 is an assembly for supporting a grinding disk 20 to be attached to one of the portable grinders (grinders) 1 illustrated in FIG. A hard resin such as nylon is used as the material of the pad 10 in consideration of heat resistance, but the material of the pad 10 is not limited thereto. Also, the type of the grinder is not limited and the pad 10 can be applied to any grinder.

The grinding disc 20 is a disc-shaped grinding tool and is used by being attached to the portable grinder 1 and then rotating. The grinding disc 20 is uniformly fixed by abrasive particles or fine powder by using an adhesive such as adhesive, gelatin, synthetic resin, or the like. Obtained on the surface of a flexible substrate material (made of cotton, paper, or the like). Therefore, the grinding disc 20 has a certain degree of flexibility. Preferably, the base material of the grinding disc 20 is a material having sufficient strength and heat resistance.

The pad 10 and the grinding disc 20 are detachably attached to the body of the portable grinder 1. As shown in FIG. 2, a through hole 10a is formed in the pad 10, and a shaft 2 extending from the body of the portable grinder 1 passes through the through hole 10a. The user first inserts the pad 10 into the shaft 2 and then inserts the grinding disc 20. Next, the user fixes the pad 10 and the grinding disc 20 to the shaft 2 by locking a nut 3 on an external thread formed on one end of the shaft 2. The surface of the pad 10 opposite the grinding disk 20 functions as a support surface 11 for supporting the grinding disk 20 during grinding. The surface of the pad 10 opposite the support surface 11 is referred to as a back surface 12.

When the user activates the portable grinder 1, the pad 10 and the grinding disc 20 rotate around the shaft 2 at a high speed. The user can grind a surface by applying the abrasive disk 20 to the surface of the abrasive article. Please note that the term "grinding" also includes the concept of grinding.

When the grinding force of the grinding disc 20 is degraded, the user removes the nut 3 from the shaft 2, replaces the new grinding disc 20, and then relocks the nut 3 on the shaft 2. At the same time, the pad 10 is reusable and the user does not need to replace the pad 10 with the grinding disc 20 each time. Please note that the pad 10 can be provided to the shaft 2 in a fixed manner.

The support surface 11 is concavely rounded around the central portion of the through hole 10a, and this portion is hereinafter referred to as a depressed portion 10b. The portion of the support surface 11 other than the recessed portion 10b is flat. In this flat part, a plurality of airways (air The passages 14 are formed in a spiral shape as a whole, in other words, each of the air passages 14 is formed obliquely to the radial direction of the support surface 11. Each of the air passages 14 is formed in an arc shape of a projection instead of a linear shape in the rotational direction of the pad 10.

In the example illustrated in Figures 3 and 5, each air passage 14 is formed such that it becomes convex in the counterclockwise direction, but of course, the air passage 14 can be formed to become convex in the clockwise direction. . The curvature of the air passage 14 can be set as needed. Further, the number of air passages 14 formed on the support surface 11 and the interval between the air passages 14 can also be set as needed.

Each air passage 14 is formed from the recess portion 10b or from the vicinity of the recess portion 10b to the peripheral portion of the support surface 11. In the present embodiment, as shown in FIGS. 3 to 5, most of the air passages 14 are a groove and one end portion 14a of the recessed portion 10b side penetrates from the support surface 11 to the back surface 12. Therefore, even when the grinding disc 20 is placed on the support surface 11, both ends of the air passage 14 are not blocked, and air can flow from the end portion 14a on the side of the back surface 12 to the peripheral side by the rotary pad 10. End portion 14b.

As described above, the pad according to an aspect of the present invention is a pad supporting a grinding disc, and the pad supports the grinding disc by being fixed to a shaft of a grinder together with the grinding disc. The pad includes a pair of support surfaces facing the grinding disc, a pair of back surfaces facing the support surface, and a plurality of air passages formed at a predetermined interval along a circumferential direction of the support surface, wherein each of the air passages At least a portion of the person penetrates from the support surface to the back surface, and each of the air passages is formed to a peripheral portion of the support surface.

In this aspect, since the provided air passage penetrates from the support surface to the back surface and extends to the peripheral portion of the support surface, air continuously flows through the passage by centrifugal force, thereby being in the grinding disc At least a portion of the heat generated in the abrasive disk is discharged by the flow of the air as the pad rotates as the grinder operates. Therefore, the increase in heat generated in the grinding disc during grinding can be suppressed. As a result, it is possible to further extend the usable time or amount of grinding of one of the grinding discs.

Also, since the pads and the grinding disc are independent of each other, when the grinding disc is unusable, only the grinding disc can be replaced. Therefore, resources can be saved compared to products in which the pads are combined with the grinding disc.

For a pad according to another aspect, each air passage may be formed in a spiral form. Forming the air passage in this manner allows heat to be expelled more efficiently because the flow of air in this passage during the rotation of the mat is further improved.

For a pad according to another aspect, each of the airways may have an arcuate shape in the direction of rotation. By forming the air passage in this manner, heat can be discharged more efficiently because the flow of air in this passage during the rotation of the pad is further improved.

Instance

Although the present invention is specifically described based on the working examples, the present invention is not limited to the working examples.

A pad corresponding to one of the pads 10 described above is prepared as a working example. The pads were made of polyamine-based synthetic resin and had an outer diameter of 96 mm. The length of the air passage is 33 mm, and the width and depth of the air passage groove are 3 mm and 2.5 mm, respectively. The length and width of the through hole are 10 mm and 3 mm, respectively. The interval between adjacent airways is 6 mm. Meanwhile, a pad similar to the working example was prepared as a comparative example, but the comparative example sealed the through holes of the respective air passages with a sealing member on the back surface. Except for the pads, all configuration and polishing objects are common between the working examples and the comparative examples.

A PDA 100D (rotation speed of 12000 rpm) manufactured by Hitachi Machine Co. was used as a main body of the portable grinder, and a fiber disc 987C60+ (outer diameter: 101.6 mm) produced by 3M was used as the grinding disc. A plate of SUS304 (a kind of Vostian stainless steel) was prepared into a polishing article.

First, in the working example and the comparative example, a thermochromic member was used to measure the temperature of the pad during the grinding of the plate by the portable grinder. The thermal label 5E-120 manufactured by NiGK Corporation was used as a thermochromic member, and the thermochromic member was adhered to the back surface of the pad. The grinding time was 60 seconds and the grinding load applied by the worker to the grinder was 1 to 5 kg.

The temperature measurement results of the working examples and comparative examples are shown in Table 1. The black circles in Table 1 indicate that the pads reached the highest level indicated during the grinding, and the hyphen indicates that the pads did not reach this temperature. Therefore, Table 1 shows that the temperature of the pads in the working example did not reach 125 ° C, and the temperature of the pads in the comparative example reached 160 ° C.

Next, the amount of grinding of the working example and the comparative example was measured while the plate was ground using a portable grinder. This measurement is performed every 30 seconds until it cannot be ground. In each of the working examples and the comparative examples, the measurement of the amount of grinding was performed twice by exchanging the grinding disc and the object for polishing (sample). Table 2 and Figure 6 show the change in cumulative grinding amount (g) of a total of four samples of the working example and the comparative example. The horizontal axis and the vertical axis of the graph in Fig. 6 are the elapsed time (seconds) and the cumulative amount of grinding (g) since the start of the grinding. In Fig. 6, the solid line shows the result of the working example and the broken line shows the result of the comparative example. Table 3 and Figure 7 show the change in the amount of grinding (g/30 sec) per 30 seconds calculated from the results of Table 2. The horizontal axis and the vertical axis of the graph in Fig. 7 are the elapsed time (seconds) and the amount of grinding (g/30 seconds) every about 30 seconds since the start of the grinding. Also in Fig. 7, the solid line shows the result of the working example and the broken line shows the result of the comparative example.

The invention has been described in detail with reference to the embodiments. However, the invention is not limited to the above embodiments. The invention can be modified in various ways without departing from the scope of the invention.

In the above embodiment, the through hole is formed in the end portion 14a of the air passage 14, but the through hole may be formed in the center of the air passage. Alternatively, the through holes leading to the back surface may be formed in a plurality of positions of the air passage, for example, a through hole may be formed in two positions, such as an end portion of the center side of the pad and a portion located at the center. And, the airway 14 includes A groove portion, but the entire air passage can penetrate from the support surface to the back surface (i.e., the groove portion may not be present).

In the above embodiment, the air passage 14 has an arc shape, but the air passage may be formed into a linear shape.

In the above embodiment, the plurality of air passages 14 are formed in a spiral shape, but the manner of forming an air passage is not limited to the above, and for example, the plurality of air passages may be formed radially. Even when the airway system is provided in the radial direction, each air passage may be formed into an arc shape of one of the protrusions in the rotational direction, or the like may be formed into a linear shape.

Thus, for a pad according to another aspect, each airway can be formed to be substantially radial.

Even in this case, since air flows through the passage by centrifugal force, at least a part of the heat generated in the grinding disc is discharged through the air flow, so that the increase in heat generated during the grinding of the grinding disc is suppressed.

The width of the air passage 14 in the above embodiment is constant, but it is also possible to form each air passage to make the width wider from the central portion of the support surface toward the peripheral portion.

That is, for the pad according to another aspect, the width of each air passage may become wider from the central portion of the support surface toward the peripheral portion. Widening the air outlet side in this way allows air to flow more easily by the rotation of the pads and discharges heat more efficiently.

In the above embodiment, the portable grinder is illustrated as an example of a grinder, but the type of the grinder is not limited.

The pad according to the invention is suitable for use in any grinder using a grinding disc.

10‧‧‧ pads

10a‧‧‧through hole

10b‧‧‧Depression

11‧‧‧Support surface

14‧‧‧ airway

14a‧‧‧End

14b‧‧‧End

Claims (5)

A pad supporting a grinding disc, the mat supporting the grinding disc by being fixed to a shaft of a grinder together with the grinding disc, the mat comprising: a supporting surface opposite to the grinding a back surface opposite to the support surface; and a plurality of air passages formed at a predetermined interval along a circumferential direction of the support surface, at least a portion of each of the air passages penetrating from the support surface To the back surface, and each of the air passages is formed to a peripheral portion of the support surface. The pad of claim 1, wherein each of the airways is formed in a spiral shape. The pad of claim 1, wherein each of the airways is formed substantially in a radial direction. The pad of any one of claims 1 to 3, wherein each of the air passages is formed in a convex arc shape in a rotational direction. The pad of any one of claims 1 to 3, wherein the width of each of the air passages widens from a central portion of the support surface toward the peripheral portion.