Abstract:
The present invention is an apparatus for polishing a precision screw. The apparatus uses abrasive in a sealed container for polishing. Hence, the present invention can do precise polishing to obtain smooth surface of thread by removing tiny burrs with the abrasive.

Description:
FIELD OF THE INVENTION 
   The present invention relates to polishing a precision screw; more particularly, relates to quickly removing burrs and bits with an abrasive on a surface of a screw for a fine polishing. 
   Description of the Related Art(s) 
   Researches related to micro-machines, precise screws, industries of aviation and space, vehicle transmissions and bio-medicines are popular and have become top hits nowadays. Take the applications in the military for example. The production and refinement for the precise screw rod in a barrel requires a good method for removing burrs precisely. Yet, until now, no satisfying solution is provided; not to mention the more complex refinement for an outer screwing thread. 
   A prior art is proclaimed in a Japanese patent, 2002 by Hitoshi Ohmori, etc., which discloses an abrasive chip of metal free, a polishing method using an electrolysis, and an apparatus for the polishing method. By using a connecting part between the abrasive and a carbon-containing non-metallic material containing the abrasive, a polishing of good efficiency is obtained with the help of the electrolysis. The prior art refines the roughness of the outer surface; yet, its applications to an inner or outer screwing thread or an irregular curved surface still has rooms left for improvement. In 2004, an other prior art is disclosed by V. K. Gorana, etc. in International Journal of Machine Tool &amp; Manufacture, Vol. 44, pp. 201–211, which discusses the effect of the extrusion pressure, the abrasive density and the size of the particle to the material removing amount, the surface roughness, the cutting force and the density of the actuated particles by polishing with a flowing abrasive. Parameters for the polishing discussed includes: particle size, abrasive type, abrasive concentration, polishing time, and the material of the to-be-polished object. The polishing method for the prior art is to remove material and to refine surface by a reciprocating motion with pressure to the to-be-polished object, where its application is especially focused on precise transmission device. And, the disadvantage still remains that applications to an outer screwing thread or an irregular curved surface still has rooms left for improvement. A third prior art is disclosed in 2004 by V. K. Jain, etc. in the International Journal of Machine Tool &amp; Manufacture, Vol. 44, pp. 1019–1029, which designs a polishing method having a combination of a polishing with particles and a fine polishing with an electromagnetic flow. A research on the surface roughness and the removal amount of the material after using the method with various abrasives is studied. Furthermore, a method for polishing with rotating particles driven by rotating magnetic poles is developed; and a research on the shapes of the magnetic poles and their rotating velocities are studied with regard to the surface roughness and the removal amount of the material after the polishing. Likewise, the disadvantage remains that applications to an outer screwing thread or an irregular curved surface still has rooms left for improvement on material removing and surface refining. 
   In a word, although the above prior arts can improve the surface fineness of the to-be-polished object, the disadvantage regarding removing burrs, pieces and deteriorated exterior in an outer tiny screw slot or on an irregular surface is still left unsolved. Hence, the prior arts do not fulfill users&#39; requests on actual use. 
   SUMMARY OF THE INVENTION 
   The main purpose of the present invention is to remove burrs and bits on a work-piece for a fine polishing. 
   The second purpose of the present invention is to load abrasive in a sealed main body to reduce the dust or the ashes after the polishing. 
   The third purpose of the invention is to obtain a simple structure for mass production, which is easy to be assembled and dissembled and to be filled with abrasive. 
   To achieve the above purposes, the present invention is an apparatus lapping with an abrasive for polishing a precision screw and a polishing method thereof. The apparatus lapping with an abrasive for polishing a precision screw comprises a spindle clamp, a rotating rod, a main body, a fixed sleeve, a support bracket and a blender device. 
   The apparatus has a polishing method comprising steps of: putting a work-piece into the main body to be fixed by the rotating rod and filling the main body with an abrasive; fixing the apparatus on a machining table; setting up parameters for polishing; activating the machining table to rotate the spindle clamp by a rotating shaft of the machining table to further rotate the rotating rod carrying the work-piece with the abrasive polishing the work-piece by flowing through the fixed sleeve circularly following a rotating of the work-piece and a blending of the blender device; and terminating the machining table and taking out the work-piece when finishing polishing. 
   Accordingly, a novel apparatus lapping with an abrasive for polishing a precision screw and a polishing method thereof are obtained. 

   
     BRIEF DESCRIPTIONS OF THE DRAWINGS 
     The present invention will be better understood from the following detailed description of the preferred embodiment according to the present invention, taken in con junction with the accompanying drawings, in which 
       FIG. 1  is the sectional view of the preferred embodiment according to the present invention; 
       FIG. 2  is the lateral sectional view of the preferred embodiment; 
       FIG. 3  is the view showing the flow chart of the polishing; and 
       FIG. 4  is the view showing the state of use. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The following description of the preferred embodiment is provided to understand the features and the structures of the present invention. 
   Please refer to  FIG. 1 , which is a sectional view of a preferred embodiment according to the present invention. As shown in the figure, the present invention is an apparatus lapping with an abrasive for polishing a precision screw and a polishing method thereof. The apparatus lapping with an abrasive for polishing a precision screw  1  comprises a spindle clamp  11 , a rotating rod  12 , a main body  13 , a fixed sleeve  14 , a support bracket  15  and a blender device  16 . 
   The spindle clamp  11  is fixed to a rotating shaft of a machining table (not shown in the figure). 
   The rotating rod  12  is positioned with a work-piece  2  and is locked with the spindle clamp  11 , where the work-piece  2  is penetrated through a top cover  131  of the main body  13  and the fixed sleeve  14  and the work-piece  2  is butted against the blender device  16  for better stability and efficiency of polishing. The work-piece  2  is assembled with the top cover  131 , the fixed sleeve  14  and the blender device  16  with a bearing or a rotary sleeve, where the bearing can be a ball bearing. 
   The main body  13  comprises the top cover  131 , a bottom seat  132 , two side covers  133  and two side panels  134 , where the two side covers  133  and the two side panels  134  are locked to the top cover  131  and the bottom seat  132  by using a position pin, a fixing bolt and/or a hasp. The top cover  131 , the bottom seat  132  and the side covers  133  are made of a metal of iron; and the side panels  134  are made of a metal or a non-metal. The main body  13  is loaded with an abrasive. The abrasive is obtained from an engine oil or a lubricating oil mixed with hard particles of SiC or other particles of a various size; or a silicon oil, a wax oil or a polymer gel solution mixed with particles of SiC or other particles of a various size. And the main body  13  is further equipped with a temperature measuring device. 
   The fixed sleeve  14  is located in the main body  13  with a support bracket  15  at bottom to be fixed on the bottom seat  132 ; and an inner diameter and a shape of the fixed sleeve  14  is modified according to the work-piece  2 . 
   The blender device  16  has a plurality of blending blades or blending rods; and is set below center of the fixed sleeve  14  and the support bracket  15  above the bottom seat  132 . The work-piece  2  is set at a rotary top pin of the blender device; is penetrated through the fixed sleeve  14  and the support bracket  15 ; and is positioned with the rotating rod  12  to be assembled with the fixed sleeve  14  and the support bracket  15  to be fixed on the bottom seat  132 ; and a size, a shape and an arrangement of the blender device  16  is modified according to the work-piece  2 , where the flowing of the abrasive is smoothened with the help of the blender device  16 . Thus, a novel apparatus lapping with an abrasive for polishing a precision screw  1  is obtained. 
   Please refer to  FIG. 2 ,  FIG. 3  and  FIG. 4 , which are a lateral sectional view of the preferred embodiment; a view showing a flow chart of a polishing; and a view showing a state of use. As shown in the figures, the apparatus lapping with an abrasive for polishing a precision screw  1  has a polishing method comprising the following steps: 
   (a) Putting a work-piece into a main body  51 : A work-piece  2  penetrating through a fixed sleeve  14  and a support bracket  15  is put between a rotating rod  12  and a blender device  16 , where the work-piece  2  is fixed by the rotating rod  2 ; and a main body  13  is filled with an abrasive  3 . 
   (b) Putting the apparatus on a machining table  52 : A spindle clamp  11  of the apparatus  1  is fixed to a rotating shaft  41  of a machining table  4  at the upper end; and the lower end of the apparatus  1  is fixed to a holder device  42  of the machining table  4 . 
   (c) Setting up working parameters  53 : Parameters are setup, which includes an abrasive diameter, an abrasive density, a working gap, an inner diameter of the fixed sleeve  14 , a type of the fixed sleeve  14 , a type of the blender device  16  and a rotating velocity of the blender device  16 . 
   (d) Activating the machining table for polishing  54 : The machining table is activated to drive the spindle clamp  11  by the rotating shaft  41  of the machining table  4  so that the rotating rod  12  rotates the work-piece  2  to bring the abrasive  3  to polish the work-piece. The abrasive  3  follows a rotating of the work-piece  2  and a blending of the blender device  16  to be flown circularly in the fixed sleeve  14  and the support bracket  15 . A machining gap between the inner diameter of the fixed sleeve  14  and the outer diameter of the work-piece  2  is formed for polishing the work-piece  2 . 
   (e) Stopping polishing  55 : The machining table  4  is stopped and the work-piece  2  is taken out. 
   In step (d), when the abrasive is not flown in the fixed sleeve  14  and the support bracket  15 , the abrasive has a good coherence. When the abrasive start to be flown in the fixed sleeve  14  and the support bracket  15  following a rotating of the work-piece and a blending of the blender device  16 , the viscosity of the abrasive is reduced following changes of the working criteria and the passing of time. A polishing liquid is thus formed. 
   The present invention, by the rotation of the work-pieces  2  cooperated with the blender device  16  and the working gap formed between the outer diameter of the work-piece  2  and the inner diameter of the fixed sleeve, transfers the abrasive  3  to press on the work-piece  2  for tiny polishing on the surface so that burrs, pieces and a deteriorated exterior is fast removed. 
   To sum up, the present invention is an apparatus lapping with an abrasive for polishing a precision screw and a polishing method thereof, where thread surface of a screw of a work-piece is fine-polished; an abrasive is loaded in a main body to reduce dusts and ashes; and the assembly and disassembly is simple for mass production. 
   The preferred embodiment herein disclosed is not intended to unnecessarily limit the scope of the invention. Therefore, simple modifications or variations belonging to the equivalent of the scope of the claims and the instructions disclosed herein for a patent are all within the scope of the present invention.