Grinding workpiece

Abstract

A grinding workpiece comprises a main body having a joint surface with a predetermined area. A containing chamber with a predetermined depth is inwardly extended from a central position of the joint surface, and an opening is formed on the joint surface. A grinding material is disposed to a portion corresponding to the joint surface of the periphery of the opening.

What is claimed is: 
     
         1 . A grinding workpiece comprising:
 a main body, wherein one end has a joint surface, and a containing chamber having a predetermined depth is inwardly extended from a central position of the joint surface, and an opening communicating with the containing chamber is formed on the joint surface;   a grinding material disposed on a portion corresponding to the joint surface of a periphery of the opening.   
     
     
         2 . The grinding workpiece as recited in  claim 1 , further comprising a pair of connection sheets capable of being repeatedly adhered, wherein the connection sheets are respectively pasted on the joint surface and the grinding material corresponding to each other. 
     
     
         3 . The grinding workpiece as recited in  claim 1 , wherein the grinding material is a ring shape, and a central ring hole of the grinding material correspondingly communicates with the opening. 
     
     
         4 . The grinding workpiece as recited in  claim 3 , wherein the grinding material comprises a circular substrate and a circular grinding plate, and a side plate surface of the circular substrate is disposed on the joint surface, and the circular grinding plate is pasted on another side plate surface of the circular substrate. 
     
     
         5 . The grinding workpiece as recited in  claim 4 , wherein the main body comprises a circular flange, and the circular flange is outwardly extended along a circumference of the joint surface to contain and embed the circular substrate therein. 
     
     
         6 . The grinding workpiece as recited in  claim 4 , wherein the grinding material comprises an extension pipe having a predetermined length, and the extension pipe is between the circular substrate and the joint surface. 
     
     
         7 . The grinding workpiece as recited in  claim 4 , wherein the grinding material comprises a grinding plane, and the grinding plane is located on a circular grinding plate that is opposite to a corresponding plate surface of the circular substrate. 
     
     
         8 . The grinding workpiece as recited in  claim 7 , wherein at least one gap is disposed to an external periphery of the circular grinding plate. 
     
     
         9 . The grinding workpiece as recited in  claim 4 , wherein the grinding material further comprises a grinding circular surface, and the grinding circular surface is located on an internal periphery of the circular grinding plate. 
     
     
         10 . The grinding workpiece as recited in  claim 1 , wherein an internal wall surface of the containing chamber of the main body is provided with several oblique gutters, and the oblique gutters respectively incline toward the containing chamber. 
     
     
         11 . The grinding workpiece as recited in  claim 10 , wherein each oblique gutter is located at the opening of the joint surface and covered by the grinding material. 
     
     
         12 . The grinding workpiece as recited in  claim 1 , wherein the main body comprises several rib portions, and each rib portion is respectively between two adjacent oblique gutters. 
     
     
         13 . The grinding workpiece as recited in  claim 12 , wherein each oblique gutter is located at the opening of the joint surface and covered by the grinding material. 
     
     
         14 . The grinding workpiece as recited in  claim 1 , wherein the main body comprises a base and a top cover connected to a side end of the base so that the containing chamber is extended to an inside of the top cover from an opened end of the base. 
     
     
         15 . The grinding workpiece as recited in  claim 14 , wherein the main body comprises an extension pipe sheath, having a predetermined length, cascaded between the base and the top cover, and two pipe ends of the extension pipe sheath are respectively fastened to corresponding portions of the base and the top cover. 
     
     
         16 . The grinding workpiece as recited in  claim 1 , wherein the main body further comprises a transmission shaft, and the transmission shaft is fixedly disposed to the main body that is opposite to the joint surface.