TWM480441U - Structure of polishing disc - Google Patents

Description

Abrasive disc structure

The present invention relates to a grinding disc structure, in particular to a grinding disc structure which is formed by injection molding of different plastics in sequence.

Today's surface grinding work is mainly carried out by means of a grinding machine. The general grinding machine is disclosed in the patents of the Republic of China, M436536, M438344, I356748 and I267426. The grinding machine usually has an electric motor. And a grinding disc, and an abrasive sheet is disposed at the bottom of the grinding disc. After the grinding machine is started, the electric motor interlocks the grinding disc to cause the polishing sheet to rotate at a high speed, and the edge of the object to be polished can be ground. Further, in addition to the use of the electric motor as a grinding power source, the grinding machine tool has another embodiment in which a pneumatic motor is used as a grinding power source. Referring to FIG. 1, the grinding disc comprises a mandrel 80, a support disc 81, an upper clamping disc 82, a lower clamping disc 83 and a foaming support 84. When assembling, the upper clamping disc 82 and the lower clamping disc 83 are respectively stacked on both sides of the supporting disc 81, and then the three are combined and fixed by at least one fastener 85, and then the mandrel 80 is worn. The upper clamping disc 82, the lower clamping disc 83 and the supporting disc 81 are arranged to complete a grinding disc semi-finished product. Finally, the semi-finished disc is placed in a foaming mold, and the foaming mold is foamed on the grinding disc semi-finished product, and the foaming support body 84 is foamed on the supporting disc 81 to complete the grinding disc. The polishing sheet (not shown) is mounted on the foam support 84.

However, in order to maintain the eccentric balance of the grinding machine, the general tooling machine adjusts the weight ratio of each component according to the balance requirement during the design process. The grinding discs of different implementation requirements and sizes have their specified weights. However, the conventionally implemented grinding disc has taken 80% of the total weight of the grinding disc in the unfinished semi-finished product, so that the foaming support 84 can only occupy 100% of the entire weight of the grinding disc. 20 points. Furthermore, the foaming support body 84 provides a proper deformation during the grinding process of the grinding machine tool, so that the polishing sheet can be more conformed to the object to be polished during the grinding process, and further, the foaming support body The degree of foaming of 84 determines the structural strength of the grinding disc. Under the limitation of weight, the foaming support 84 cannot be foamed at a higher density, and the foaming support 84 is loosely structured and cannot withstand grinding. The high-speed rotation in the process, and it is not possible to properly deform according to the appearance of the object to be polished, and it is not possible to quickly return to the normal state, which is not advantageous for grinding.

The main purpose of the present invention is to provide a grinding disc structure having a better structural strength.

To achieve the above object, the present invention provides a grinding disc structure that can be assembled with and driven by a machine tool, and includes a mandrel, a primary carrier tray, and a primary carrier tray. The mandrel has a plurality of bridging sections connected to the machine tool and a mating section extending from the bridging section. The primary carrier has a first fitting portion that is integrally coated with a first injection plastic to completely cover the fitting portion, and a carrier portion extending from a periphery of the first fitting portion. The secondary carrier has an attachment portion that is attached to the support portion by a second injection plastic and supported by the support portion, and an attachment surface that is assembled with an abrasive sheet opposite to the engagement portion.

In an embodiment, the primary carrier has at least one formed on the carrier And a second fitting portion for increasing the adhesion area of the secondary carrier, the secondary carrier having a third fitting portion extending from the engaging portion and engaging the second engaging portion.

In an embodiment, the second fitting portion is annularly disposed on a periphery of the bearing portion.

In an embodiment, the second fitting portion is adjacent to the periphery of the first fitting portion.

In one embodiment, the carrying portion has a heat dissipating portion that is looped with the first fitting portion and is not attached by the second ejecting plastic.

In an embodiment, the carrying portion has a plurality of heat dissipating blades disposed in the heat dissipating portion.

In an embodiment, the carrying portion faces the secondary carrier plate with at least one fitting rib for increasing the strength of the connection with the secondary carrier.

In an embodiment, the secondary carrier has at least one recess disposed on a periphery of the joint.

The grinding disc structure is configured to eject the mandrel with the first injection plastic to form the primary carrier tray, the primary carrier tray having a first fitting portion that completely covers the fitting portion of the mandrel and the first fitting portion The bearing portion extends from the periphery of a fitting portion. Then, the primary carrier tray is ejected by the second injection plastic to form the secondary carrier tray, and the secondary carrier tray has the joint portion attached to the support portion and supported by the carrier portion and opposite to the joint portion. The mounting surface assembled by an abrasive sheet. Therefore, the grinding disc structure of the present invention has the following characteristics compared with the conventional grinding disc:

1. The primary carrier tray is formed by ejecting the mandrel with the first injection plastic, and the weight thereof is much smaller than the weight of the conventional grinding disc from the upper clamping disc, the lower clamping disc and the supporting disc. Therefore, the overall weight ratio of the secondary carrier can be increased.

2. The secondary carrier tray is not made by a foaming process, and the overall weight ratio of the secondary carrier tray is increased, and the structural strength and toughness of the secondary carrier tray can be increased, so that the secondary carrier The disc can be more conformable to the abrasive during the grinding process and can be applied to a higher speed grinding machine.

1‧‧‧ mandrel

11‧‧‧Bridge section

12‧‧‧Merge segment

2‧‧‧Primary carrier

21‧‧‧ First mating department

22‧‧‧Loading Department

23‧‧‧Second fitting

24‧‧‧ fitting ribs

25‧‧‧heating section

251‧‧‧heating blades

3‧‧‧Secondary carrier

31‧‧‧ joints

32‧‧‧Installation

33‧‧‧The third fitting department

34‧‧‧ Groove

80‧‧‧ mandrel

81‧‧‧Support disk

82‧‧‧上夹盘

83‧‧‧下夹掣

84‧‧‧Foam support

85‧‧‧Locker

9‧‧‧Abrasion machine

91‧‧‧Abrasive

S01, S02, S03‧‧‧ steps

Figure 1. Schematic diagram of the structure of a conventional abrasive disc structure.

Figure 2 is a schematic view showing the assembly of an embodiment of the present abrasive disc structure with a grinding machine.

Fig. 3 is a structural exploded view of an embodiment of the present invention.

Fig. 4 is a structural exploded view showing the other direction of an embodiment of the present invention.

5-1 is a cross-sectional view (1) of the structure of an embodiment of the present invention.

Fig. 5-2 is a cross-sectional view (2) showing the structure of an embodiment of the present invention.

Figure 6. Schematic diagram of the preparation process of the inventive abrasive disc structure.

The detailed description and technical content of this creation are described below with reference to the following drawings: Please refer to Figure 2 to Figure 5-2. The grinding disc structure referred to in this creation is assembled with a grinding machine 9 and subjected to the grinding machine. 9 is driven to rotate, and the abrasive sheet 91 assembled on the disc structure is ground. The grinding disc structure is mainly formed by injection molding a first injection plastic and a second injection plastic. The grinding disc structure comprises a mandrel 1, a primary carrier 2 and a primary carrier 3. The mandrel 1 has a plurality of bridging sections 11 connected to the grinding machine 9 and a mating section 12 extending from the bridging section 11, and the primary carrier 2 is the first shot The plastic is produced by injection molding of the mandrel 1 having a first fitting portion 21 completely covering the fitting portion 12 and a bearing extending from the periphery of the first fitting portion 21. Part 22. The secondary carrier 3 is formed by injection molding the second injection plastic relative to the primary carrier 2, and the secondary carrier 3 has a joint attached to the support 22 and supported by the carrier 22. The portion 31 and a mounting surface 32 opposite to the joint portion 31 for assembling the polishing sheet. In order to explain in detail the characteristics of the grinding disc structure of the present invention, the preparation method of the grinding disc structure is further described herein, and referring to FIG. 6, the preparation method is as follows: a) providing a mandrel step S01: providing the core a shaft 1 having the bridging section 11 connected to the grinding tool assembly, and the fitting section 12 connecting the bridging section 11; b) a first injection molding step S02: placing the mandrel 1 Inserting into a cavity of a first injection molding die (not shown), the first injection molding die is ejected by the first injection molding plastic, and is formed after the first injection plastic is cooled. The primary carrier 2 is formed, and the primary carrier 2 is completed as shown in FIG. 5-1, having a first fitting portion 21 completely covering the fitting portion 12 and an extension of the first The bearing portion 22 on the periphery of the fitting portion 21. In addition, the first injection plastic used in the present creation may be a mixed plastic of glass fiber; c) a second injection molding step S03: placing the mandrel 1 fitted with the primary carrier 2 into a second In the injection molding die (not shown), the second injection molding die is used to eject the bearing portion 22 of the primary carrier 2 by the second injection molding die, and when the second injection plastic is cooled, The secondary carrier 3 is formed at the position of the carrier 22, and the secondary carrier 3 is as shown in FIG. 5-2, and has a joint 31 attached to the support 22 and supported by the carrier 22. And the mounting surface 32 opposite to the joint portion 31. Further, the second injection plastic may be selected from the group consisting of polyurethane, epoxy resin, unsaturated polyester, and phenolic plastic.

After the construction of the grinding disc is constructed, the bridging section 11 of the mandrel 1 can be assembled with the grinding machine 9, and the polishing sheet 91 can be assembled on the mounting surface 32. The embodiment is lighter in weight than the conventional grinding disc with the support tray 81, the upper clamping disc 82, and the lower clamping disc 83 (see FIG. 1). Therefore, the secondary carrier tray 3 is lighter. The weight ratio of the structure of the grinding disc can be increased, thereby increasing the structural strength and toughness of the secondary carrier tray 3. Therefore, the toughness of the secondary carrier 3 during the grinding process allows the abrasive sheet 91 to be more conformable to the abrasive and can be rapidly deformed depending on the appearance of the abrasive. In addition, the secondary carrier tray 3 has better structural strength than the foamed support body 84 which is conventionally used for foam molding, and is less susceptible to damage during the grinding process, and can also withstand the centrifugal force caused by high-speed rotation. Force.

Referring to FIG. 2 to FIG. 5-2 , further, in order to increase the bonding strength between the primary carrier 2 and the secondary carrier 3 , the primary carrier 2 has at least one formed on the carrier 22 for adding a second fitting portion 23 having an area attached to the secondary carrier 3, and the secondary carrier 3 has a third fitting extending from the engaging portion 31 and engaging the second engaging portion 23 Part 33. However, the second fitting portion 23 has many aspects. In the present invention, the second fitting portion 23 can be a hole-shaped or a groove-like structure, and the third fitting portion 33 can be in the same manner. The second fitting portion 23 is formed, and will not be described here. However, the second fitting portion 23 may be disposed on the periphery of the carrying portion 22 or adjacent to the periphery of the first fitting portion 21 . In addition, the carrier portion 22 is provided with at least one fitting rib 24 for increasing the strength of the connection with the secondary carrier tray 3 facing the secondary carrier tray 3. Furthermore, the carrying portion 22 further has a heat dissipating portion 25 which is disposed on the first fitting portion 21 and is not exposed by the second ejecting plastic. The heat dissipating portion 25 is further provided with a plurality of heat dissipating blades 251. The blade 251 generates a heat dissipation airflow by the high-speed rotation of the grinding disc structure during the grinding process to prevent heat from accumulating in the grinding disc structure. In addition, the creation can also be on the secondary carrier 3 At least one groove 34 is disposed on the periphery of the joint portion 31, and the groove 34 can generate a corresponding deformation when the secondary carrier tray 3 contacts the object to be ground for grinding, and the secondary bearing can be The tray 3 is more suitable for the object to be polished.

In summary, the grinding disc structure is formed by a first shot plastic and a second shot plastic. The first shot plastic is first injected into a mandrel to form a primary carrier. The carrier tray has a first fitting portion that completely encloses a fitting section of the mandrel and a carrier portion that extends from a periphery of the first fitting portion. Thereafter, the primary carrier is ejected by the second injection plastic to form a primary carrier, and the secondary carrier has a joint attached to the support and supported by the support, and a joint opposite to the joint A mounting surface for an abrasive sheet assembly. Thereby, it is possible to overcome the problem that the conventional grinding disc is mostly foamed, resulting in poor grinding effect.

The above description has been made in detail, but the above is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the creation of the creation, that is, the equality of the patent application scope according to the present creation. Changes and modifications are still covered by the patents of this creation.

1‧‧‧ mandrel

11‧‧‧Bridge section

12‧‧‧Merge segment

2‧‧‧Primary carrier

21‧‧‧ First mating department

25‧‧‧heating section

251‧‧‧heating blades

3‧‧‧Secondary carrier

31‧‧‧ joints

34‧‧‧ Groove

9‧‧‧Abrasion machine

91‧‧‧Abrasive

Claims (8)

An abrasive disc structure assembled with a machine tool and driven by the machine tool, the grinding disc structure comprising: a mandrel having a set of bridging sections connected to the machine tool, and a fitting section extending from the bridging section a primary carrier having a first fitting portion that is integrally coated with a first injection plastic to completely cover the fitting portion, and a carrier portion extending from a periphery of the first fitting portion; and a primary carrier tray And a joint portion which is attached to the support portion by a second injection plastic and supported by the support portion, and an installation surface for assembling an abrasive sheet opposite to the joint portion. The grinding disc structure of claim 1, wherein the primary carrier tray has at least one second fitting portion formed on the carrier portion for increasing an area of attachment to the secondary carrier tray, the secondary carrier tray having a third fitting portion extending from the joint portion and engaging the second fitting portion. The grinding disc structure of claim 2, wherein the second fitting portion is annularly disposed on a periphery of the bearing portion. The grinding disc structure of claim 2, wherein the second fitting portion is adjacent to a circumference of the first fitting portion. The grinding disc structure of claim 1, wherein the carrying portion has a heat dissipating portion that is looped with the first fitting portion and is not attached by the second ejecting plastic. The grinding disc structure of claim 5, wherein the carrying portion has a plurality of heat dissipating fins disposed in the heat dissipating portion. The grinding disc structure of claim 1, wherein the carrying portion faces the secondary carrier plate with at least one fitting rib for increasing the strength of connection with the secondary carrier. The abrasive disk structure of claim 1, wherein the secondary carrier disk has at least one groove disposed at a periphery of the joint portion.