KR100634126B1 - Micro drill step grinding m/c - Google Patents

Abstract

A micro drill step grinding machine is provided to perform loading and unloading of materials by using a selective rotation of a rotor using at least two chucks. A micro drill step grinding machine includes a conveyor part(200), a machining part(300), and a fixing part(400). The conveyor part has a conveyance base plate(210) selectively and reciprocally moved to a center of a bed(120), a spindle(228) rotating the conveyance base plate, and a conveyance frame(240) for loading and unloading a material. The machining part has a grinder(310) and a polisher(320). The fixing part has a V block for supporting the material, a fixing roller for selectively pressing the material, and a cylinder for vertically moving the fixing roller.

Description

Micro Drill Step Grinding Machine {Micro Drill Step Grinding M / C}

1 is a perspective view showing a step grinding machine according to the present invention,

2 is a perspective view showing the main part of the present invention,

Figure 3 is a perspective view of the main part of the present invention from a different angle,

4 and 5 is an operation state view from the front of the transfer unit shown in Figure 2,

6 is a perspective view showing the mounting plate of the transfer unit;

7 is a perspective view showing a transfer table of the transfer unit;

8 and 9 are views showing the operating state of the rotor shown in FIG.

10 is an enlarged plan view showing a cutting portion of a processing apparatus unit;

FIG. 11 is an enlarged plan view illustrating a portion A of FIG. 10.

12 is an enlarged plan view of a portion B of FIG. 11;

13 and 14 are views schematically showing the movement means of the finishing base plate,

15 is a view showing a product is completed step processing, and

16 to 22 are diagrams showing the step processing sequence.

<Description of the symbols for the main parts of the drawings>

100: step grinding machine 110: enclosure

120: bed 200: transfer unit

210: transfer base plate 220: side wall

228: spindle 230: mounting plate

240: feeder 242: Z-axis feed rail

250: rotor 256: Y-axis feed rail

262: X-axis feed rail 300: processing unit

310: roughing machine 312: roughing base plate

316: roughing blade 320: finishing machine

322: finishing base plate 326: finishing edge

400: fixing device

The present invention relates to the manufacture of a microdrill, and more particularly, to a microdrill step grinding machine for performing a step process in the process of manufacturing a microdrill.

Generally, micro drill for PCB hole processing is a small drill with a diameter of 0.5mm or less, and the general shape is 1/8 ”(3.175mm) of shank part, and it is reduced to an inclined surface, which is necessary for the machining of blade parts. Only use the minimum diameter and length of the tool.

The main raw material of the microdrill material is cemented carbide of Wc-CorP. It is an ultrafine cemented carbide with the stiffness, toughness, and abrasion resistance, which are the basic characteristics of cutting tools. The hardness is HRA92, and the strength of 430Kgf / mm ² .

The usage can be divided into metal processing and printed circuit board (PCB substrate) micro hole processing. Recently, with the development of information and communication, hardware, semiconductors, mobile phones, computers, etc. are continuously miniaturized and light weighted, so parts are also miniaturized. Micro holes for component mounting are also becoming smaller. Therefore, microdrills have also been miniaturized and are now being produced to 0.1mm.

The process for manufacturing such a microdrill is first, a cutting process to prepare a circular rod of 3.3mm diameter and cut the length of the microdrill to be completed, and second, to smoothly cut the cutting surface of the cut material to match the exact length dimension Plane grinding process (38.1 ± 0.1mm), third, roughing and finishing process (3.1c diameter) to smoothly trim the outer diameter of planar-grinded material to the correct diameter, and fourth, chamfering the back of the shank part Process, fifth, step machining process to form the shape of shank and flute part of microdrill, sixth, grooving process to process helix angle and tip angle of flute part, and finally the defect of the finished microdrill can be detected. Inspection process.

However, the equipment that performs such a process is a state-of-the-art nano-technology-intensive equipment, almost no imports and use in Korea because there is no example produced and developed.

Therefore, in order to contribute to the domestic industrial development by developing a self-developed stepper that performs the step processing process for processing the basic shape of the microdrill in the above process.

The present invention has been made to meet the above needs, and an object of the present invention is to provide a microdrill step grinding machine for processing the shape of the flute portion and the shank portion in the material of the chamfered microdrill.

The present invention to achieve the above object,

A transfer base plate installed on one side of the bed to selectively reciprocate in the center direction of the bed, a spindle for biting and rotating the material while selectively reciprocating in the same direction on the upper surface of the transfer base plate, and loading the material onto the spindle and A conveying device part made of a conveying table of a three-dimensional conveying method for unloading;

Provided is a microdrill step grinding machine, which is provided on the other upper surface of the bed and comprises a processing device portion consisting of a roughing machine and a finishing machine for stepping the material while selectively reciprocating in the direction of the center axis of the material.

From here. Preferably, the transfer unit further includes a mounting plate having a rod pallet on which the material is placed before processing and an unload pallet on which the material is processed after processing.

And it is preferable to further include a fixing device for fixing the material bitten on the spindle between the feeder and the processing device, the fixing device is a V-block supporting the material from the bottom, the fixing to selectively press the material from the top It consists of a cylinder which raises and lowers a roller and a fixed roller.

At this time, the transfer table is fixed to the bed X-axis transport rail, the Y-axis feed rail to reciprocate selectively along the X-axis feed rail, Z-axis feed rail to selectively reciprocate along the Y-axis feed rail, Z-axis It consists of a rotor that selectively rotates to load and unload material onto the spindle while selectively reciprocating along the conveying rail, wherein the rotor is preferably formed with two load and unload feed chucks.

The roughing machine is a roughing base plate which selectively reciprocates in the direction of the center axis of the material on the upper surface of the bed, a spin motor fixed on the upper surface of the roughing base plate, and is rotated while being mounted on the spin motor so that the material is horizontal to its axial direction. It is preferable that it consists of a rough blade which grinds easily.

And the finishing machine, like the roughing machine, is a finishing base plate that selectively reciprocates in the direction of the center axis of the material on the upper surface of the bed, a spin motor fixed on the upper surface of the finishing base plate, and is rotated while being mounted on the spin motor to rotate the material. It is preferable that it consists of the finishing blade which grinds perpendicularly to a direction.

At this time, the finishing blade will be preferably processed in the rear adjacent to the roughing blade.

On the other hand, the movement means of the finishing base plate is a feed rail is formed in an oblique line on the upper surface of one side of the finishing base plate, the guide rail is fitted to the feed rail, the screw shaft is screwed in the direction perpendicular to the finishing base plate, The screw shaft is connected to the submotor to minimize vibration by the finishing spindle.

Hereinafter, a microdrill step grinding machine according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing a step grinding machine according to the present invention, Figure 2 is a perspective view showing the main part of the present invention, and Figure 3 is a perspective view of the main part of the present invention from a different angle.

1 to 3, in the step grinding machine 100 according to the present invention, the bed 120 is placed inside the transparent housing 110 in which the inside is projected, and the microdrill is disposed on one side of the upper surface of the bed 120. The transfer unit 200 for transferring the materials of the processing unit, and the processing unit 300 for processing the material transferred by the transfer unit 200 on the other side of the upper surface of the bed 120 is installed. In addition, in the present invention, a control unit (not shown) that is responsible for all the control of the transfer unit 200 and the processing unit 300 is provided.

First, the transfer unit 200 is formed in one direction from the center on the upper surface of the bed 120, from one side on the upper surface of the bed 120 to the processing unit 300 of the other side by the control of the controller unit. A transfer base plate 210 reciprocating, a spindle body 224 reciprocating back to the processing unit 300 side under the control of the control unit at the upper portion of the transfer base plate 210, and the transfer base plate 210. Placed on the side of the microdrill processing material and the post-processing material is loaded and unloaded the mounting plate 230, and similarly installed on the side of the transfer base plate 210 adjacent to the mounting plate 230 to control the control unit It consists of a three-dimensional transfer tray 240 for selectively loading and unloading the processing material and the post-processing material of the mounting plate 230 by.

4 and 5 is an operation state view as seen from the front of the transfer unit shown in FIG.

Reciprocating means of the transfer base plate 210 is made by a screw method as shown in FIG. The reciprocating means is operated by a separate sub-motor 212, the screw shaft 214 and the guide 216, on the upper surface of the bed 120, the transfer base plate 210 is disposed and the transfer base plate ( One or more grooves (not shown) and protrusions (not shown) are formed on the lower surface of the 210 to have a structure in which the transport base plate 210 slides with respect to the bed 120. And the sub motor 212 is mounted on the outside of the side of the transfer base plate 210, the screw is coupled to the guide 216 integrally formed in the interior of the transfer base plate 210 while being connected to the sub-motor 212 Axis 214. That is, the sub-motor 212 is rotated by the command of the control unit to rotate the screw shaft 214 together, and the guide 216 screwed by the rotation of the screw shaft 214 reciprocates and consequently the transfer base plate. 210 is a reciprocating motion.

On the other hand, on the upper surface of the transfer base plate 210, a rod-shaped rail 222 extending to the processing unit 300 side is formed, the rail 222 is controlled by the control unit in such a rail 222 The spindle body 224 to reciprocate along is coupled, the body 224 is mounted to the spindle 228 to face the processing unit 300 side. In order to form the rail 222, vertical side plates 220 are formed on one side and the other side of the transfer base plate 210, and the rails 222 are preferably formed between the side plates 220. In addition, the spindle body 224 is required for the movement means for the reciprocating motion, the same screw method as the movement means used in the transfer base plate 210 is used. That is, the sub-motor is disposed outside the side plate 220 of the processing unit 300, the screw shaft is connected to the sub-motor again, the screw shaft is screwed to the inside of the spindle body 224 again.

The spindle 228 is formed with a chuck capable of fixing the material at the distal end. The material is loaded and unloaded by the feeder 240. When the material is loaded by the feeder 240, the fixed chuck catches the material. , The processing unit 300 moves to the side and the processing is completed, the moving back to move back to the unloading table 240. The fixed chuck is operated here by air supplied from an external air compressor (not shown). And the spindle 228 is provided with a spindle motor 226 for rotating the spindle 228 separately.

6 is a perspective view showing the mounting plate of the transfer unit;

The mounting plate 230 is provided with a load pallet 232 and an unloading pallet 236 as shown in FIG. 6, and the materials (A) having finished the chamfering process are contained in the load pallet 232 and placed in the mounting plate 230. Is moved to). That is, the load pallet 232 and the unload pallet 236 should always be placed in the same position to have the same coordinates. Accordingly, after the three-dimensional feeder 240 lifts the processing material A from the rod pallet 232, the spindle 228 is bitten and unloaded after the processing from the finished spindle 228. 236).

7 is a perspective view showing a transfer table of the transfer unit, and FIGS. 8 and 9 are views illustrating an operating state of the rotor shown in FIG. 7.

As shown in FIG. 7, the three-dimensional feeder 240 includes a rotor 250 and X-, Y-, and Z-axis transfer rails 262, 256, and 242.

As shown in FIGS. 8 and 9, the rotor 250 may selectively and repeatedly move at intervals of 90 degrees within a range of 270 degrees, and the feed chucks 252 are formed at adjacent 90 degree intervals. Here, one of the two feed chucks 252 is a feed chuck for loading and the other is a feed chuck for unloading. In addition, a motor for operating the rotor 250 is provided separately therein, the motor used here is a conventional alpha-step motor is used. Each feed chuck 252 is operated by air supplied from a separate air compressor, similar to the fixed chuck of the spindle 228. The rotor 250 is fixed to the vertical Z-axis transfer rail 242 to perform the up and down reciprocating motion.

The Z-axis transfer rail 242 again moves forward and backward along the Y-axis transfer rail 256. The Y-axis feed rail 256 again performs left and right reciprocating motion along the X-axis feed rail 262.

Here, on the lower surface of the X-axis conveying rail 262 is fixed to the bed 120 is fixed to the bed 120 is formed on the side of the X-axis conveying rail 262 is installed while being supported in the air, The Y-axis feed rail 256 is coupled to the X-axis feed rail 262 to support the same, and the Z-axis feed rail 242 is also coupled to the Y-axis feed rail 256 and supported.

Briefly describing the preferred means of movement of the X, Y, Z axis transfer rails (262, 256, 242), as in the transfer base plate 210 all operate in a screw manner.

That is, a sub-motor is built into the upper side of the Z-axis transfer rail 242, and a screw shaft extending downward is connected to the sub-motor, and the Z-axis transfer rail 242 supports the rotor 250. Screw shaft is screwed to the lifting plate 248 is coupled. Here, a guide groove 244 is formed on one side of the Z-axis transfer rail 242, and a guide 249 inserted into the guide groove 244 is formed in the lifting and lowering transfer plate 248, and the guide is formed. 249 is screwed with the screw shaft. Therefore, as the screw shaft rotates by the operation of the sub-motor, the guide 249 is moved to substantially raise and lower the rotor 250.

And on the other side of the Z-axis transfer rail 242 to which the lifting plate 248 is coupled is formed a guide 246 coupled with the Y-axis transfer rail 256, one side of the Y-axis transfer rail 256 On the guide groove 258 to which the guide 246 is coupled is formed. In addition, the sub-motor is embedded in the Y-axis transfer rail 256, the screw shaft is connected to the sub-motor again, the screw shaft is screwed with the guide 246 again.

A guide 260 coupled to the X-axis transfer rail 262 is formed on the lower surface of the Y-axis transfer rail 256, and the sub-motor 265 is embedded in the X-axis transfer rail 262. The screw shaft 268 is again connected to the motor 265, and the screw shaft 268 is screwed to the guide 260 of the Y-axis transfer rail 256. Here, the sub-motors of the Z-axis and Y-axis transfer rails 242 and 256 are connected coaxially with the guides coupled thereto, but the sub-motors 265 of the X-axis transfer rail 262 are not coaxially connected due to space constraints. Therefore, the connecting shaft 267 is connected between the sub-motor 265 and the screw shaft 262 to transmit power.

FIG. 10 is an enlarged plan view of the cutting portion of the processing apparatus, FIG. 11 is an enlarged plan view of portion A of FIG. 10, and FIG. 12 is an enlarged plan view of portion B of FIG. 11.

2 and 3, the processing unit 300 includes a roughing machine 310 and a finishing machine 320 on the other side of the upper surface of the bed 120. Here, the contact points of the roughing machine 310 and the finishing machine 320 may be located on the same line as the center of the spindle 228 as shown in FIGS. 10 and 11.

In addition, the roughing machine 310 primarily performs step machining of the processing material mounted on the spindle 228, and the roughing blade 316 is disposed in a direction substantially parallel to the longitudinal direction of the material. In addition, the finishing machine 320 performs step processing of the processing material mounted on the spindle 228 in a secondary manner, and processes the material to the exact value immediately after the material is roughened by the roughing machine 310 (FIG. 12). Reference). And the finishing blade 326 of the finishing machine 320 is disposed in a direction perpendicular to the longitudinal direction of the material.

Roughing machine 310 is provided with a spin motor 314 to rotate the roughing blade 316. The spin motor 314 is mounted on the top of the rough base plate 312, the rough base plate 312 is reciprocated by the control to the axial center of the spindle 228 at the top of the gable bed 120. . The movement means of the roughing base plate 312 is a screw method is used, similar to the transfer base plate 210, the sub-motor and the screw shaft is provided, the screw shaft is screwed to the guide integrally formed in the roughing base plate 312 Combined. One or more grooves and protrusions are formed on the upper surface of the bed 120 and the lower surface of the roughing base plate 312 so that the roughing base plate 312 slides with respect to the bed 120.

The finishing machine 320 is provided with a spin motor 314 for rotating the finishing blade 326 like the roughing machine 310. The spin motor 314 is mounted on the top of the finishing base plate 322, the finishing base plate 322, like the rough bay plate 312, from the top of the bed 120 to the axial center of the spindle 228 It reciprocates by control.

13 and 14 are views schematically showing the movement means of the finishing base plate.

As the movement means of the finishing base plate 322, the screw method is used similarly to the roughing bay plate 312. Here, finishing is a process requiring precision, and the finishing base plate 322 may not move precisely due to the shaking of the spin motor 324. Therefore, in the present invention, the movement means of the finishing base plate 322 is a screw method, for the more precise movement as shown in Figure 13 and 14 to form a separate transfer rail 323. That is, as shown in the drawing, a separate driving unit 330 is installed on one side of the finishing base plate 322 to connect the sub-motor 332 and the screw shaft 334 in the driving unit 330, and the screw shaft 334 And a guide 336 which is screwed together. And the guide 336 is coupled to the upper surface of one end of the finishing base plate 322 again. At this time, the feed rail 323 to which the guide 336 is moved is formed on one upper surface of the finishing base plate 322. The transfer rail 323 is formed in an oblique direction that is not parallel to the screw shaft 334 so that the finishing base plate 322 in the perpendicular direction of the guide 336 as the guide 336 is moved backwards for precise reciprocating motion do. On the lower surface of the finishing base plate 322 and the upper surface of the bed 120, one or more lines and grooves corresponding to each other are formed to have the structure in which the finishing base plate 322 slides with respect to the bed 120.

On the other hand, between the transfer unit 200 and the processing unit 300 is further provided with a fixing unit 400 for fixing the material (A) bite to the fixed chuck of the spindle 228 without shaking.

4 and 5, the fixing device 400 is formed adjacent to the side wall 220 erected on the processing unit 300 side, and is vertically upright adjacent to the side wall 220. The V-block 410 is formed on the surface and the fixed roller 430 is selectively lowered by the air cylinder 420 in the upper portion of the V-block 410 to abut the V-block 410. That is, the cylinder 420 is contracted by the control of the control unit and the fixed roller 430 is lowered to fix the material between the V-block 410 and the fixed roller 430.

The following briefly describes the operation and use of the microdrill step grinding machine 100 according to the present invention.

15 is a view for checking the operation direction of the transfer unit and the processing unit, Figure 15 is a view showing the product is completed step processing, and Figures 16 to 22 are views showing the step processing sequence.

Chamfering finished material (A) is mounted on the load pallet 232 so that the chamfered portion is directed to the lower side is placed on the mounting plate (230). The material (A) used here is 38.1 W 0.1mm in length, and has a diameter of 3.1.

When the operation starts, the X-axis and Y-axis feed rails 262 and 256 of the three-dimensional feed table 240 move so that the rod feed chuck 252 is positioned on the upper portion of the material A to be processed, and then the Z-axis feed. The rail 242 moves so that the rod feed chuck 252 is positioned at the tip of the material A, and the feed chuck 252 moves with the material A to move to the fixed chuck of the spindle 228.

The rotor 250 located in front of the fixed chuck rotates clockwise to induce the chamfered portion of the material A to enter the fixed chuck. The stationary chuck bites the material A and the rotor 250 falls back and waits again with the other material A placed in the load pallet 232. The material bitten by the fixed chuck moves to the processing unit 300 side of the transfer base plate 210 and the spindle body 224 so that the opposite side of the chamfered portion of the material A comes into contact with the roughing blade 316.

The spindle 228 continues to rotate and the feed base plate 210, the spindle 228, the roughing machine 310 and the finishing machine 320 are in numerical control while the roughing blade 316 and the finishing blade 326 also rotate. To process the material into the desired shape. Here, as shown in FIG. 15, the movement of the transfer base plate 210 is referred to as X1, the movement of the spindle body 224 is referred to as X2, the movement of the finishing machine 320 is referred to as Y1, and the roughing machine 310 is moved. The movement is called Y2 and the detailed processing sequence will be described.

First, looking at the shape and major parts of the finished microdrill, as shown in FIG. 16, the blade is formed by the primary machining at the tip of the microdrill, and undercut may be formed in parallel with the primary processing. And a taper which becomes radially large by a secondary process is formed, and a shank part is formed by a tertiary process.

First, as shown in FIG. 17, X1 and X2 are moved to induce the machining portion of the material A to contact the roughing edge 316. At this time, the roughing edge 316 is positioned so as to be spaced apart from the axial center of the material (A) by a predetermined distance to have a desired diameter at the cutting edge of the material (A), the finishing edge 326 is the opposite side of the roughing blade (316) Are positioned to be machined to the same diameter.

When the material A is ready for processing, the cylinder 420 of the fixing device 400 is contracted so that the material A is fixed to the V-block 410 while the fixing roller 430 is lowered. Then, X2 is moved to the processing unit 300 to perform the first step machining. In the primary processing, a diameter of 0.25 mm is processed to about 7 mm. Since primary machining requires precision by machining the edge of the microdrill, finishing must be done after roughing. In addition, an undercut having a diameter slightly smaller than that of the blade may be formed according to the type of microdrill. As shown in FIG. 18, 0.235 mm is processed only by finishing from 4 mm to 7 mm of the blade as shown in FIG. 18. When finished, the finisher 320 is retired without further processing. Of course, it is good to finish in the 2nd and 3rd machining, but it is possible to finish only the blade part which requires precision and roughing the rest.

Next, as shown in FIG. 20, the tapering process is performed by moving X2 and Y2 together. That is, X2 moves to the roughing edge 316 side, and the roughing machine 310 falls back and processes it. At this time, the processing length is appropriately about 3mm in the horizontal direction. It is preferable that a rounding process for forming a curvature at the beginning of the taper is preceded by the tapering process (see FIG. 19).

Next, as shown in FIG. 21, Y2 is fixed and X2 is moved to perform the third step of about 2.5 mm in length and 1.2 mm in diameter.

Next, as shown in FIG. 22, the fourth taper processing is performed while moving X2 and Y2 together. Here, it is preferable to form a constant curvature at the beginning of the taper before performing the fourth processing (see Fig. 21).

Next, as shown in FIG. 23, Y2 is reversed, the cylinder 420 of the fixing device 400 is extended to raise the fixing roller 430, and X1 and X2 are reversed to the opposite side of the processing device 300. Let's do it.

When the work is finished and the spindle 228 is stopped, the three-dimensional carriage 240 is moved again so that the rotor 250 approaches the fixed chuck of the spindle 228.

Here, the material A is pre-processed by the rod feed chuck 252 of the rotor 250, and the other unload transfer chuck 252 is empty. Therefore, after the rotor 250 is rotated and the unloading feed chuck 252 in the empty state approaches the spindle 228 and pulls out the material after processing by the fixed chuck, the rotor 250 rotates by 90 degrees and reloads. After the material A waiting in the transfer chuck 252 is passed to the fixed chuck, the transfer table 240 is retracted and the post-process material is placed in the unloaded pallet 236. Then, it waits with the material (A) before processing again.

In the repeated operation as described above, all of the pre-processing materials A in the rod pallet 232 are placed in the unloaded pallet 236 after being finished. Normally, 500 seating holes 233 and 237 are formed in the load and unload pallets 232 and 236, respectively. The control unit stores the material, and all the materials A of the load pallet 232 are unloaded in the pallet 236. If it moves to, stop the operation.

After stopping, the unloaded pallet 236 is passed to the grooving process and the rod pallet 232 and the unloaded pallet 236 of the pre-machining material (A) are finished for the next operation. 230) Here, the unloaded pallet 236 may be replaced by the load pallet 232 of the previous operation.

On the other hand, the control unit is prepared by the program in the numerical control method for all the work order and work dimensions as described above. Such a program is prepared in a PC and then connected to the PC and the control unit to transmit the program.

As described above, the microdrill step grinding machine according to the present invention can boast ultra-precision and automatically produce 1-2 pieces per minute according to the specifications of the microdrill.

In addition, since the three-dimensional feed table of the step grinding machine according to the present invention has a rotor and two feed chucks, it is possible to load and unload materials at once by selective rotation of the rotor.

In addition, the finishing-side movement means of the step grinding machine according to the present invention solves the problem that the precision is reduced due to the vibration by the spin motor by the feed rail in the diagonal direction.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (8)

Is installed on one side of the bed 120 and the transfer base plate 210 and the selective reciprocating movement toward the center of the bed 120, and selectively reciprocating in the same direction again on the upper surface of the transfer base plate 210 A feeder unit 200 including a spindle 228 for biting and rotating the material, and a feeder 240 having a three-dimensional feed method for loading and unloading material on the spindle 228; A processing apparatus unit 300 formed on the other upper surface of the bed 120 and including a roughing machine 310 and a finishing machine 320 for stepping the material while selectively reciprocating in the direction of the center axis of the material; And A fixing device 400 for fixing a material bitten by the spindle 228 is included between the transfer device 200 and the processing device 300, and the fixing device 400 is the material. V-block 410 supporting the lower portion, a fixed roller 430 for selectively pressing the material from the top, and a microdrill step comprising a cylinder 420 to raise and lower the fixed roller 430 Grinding machine. According to claim 1, wherein the transfer unit 200 further comprises a mounting plate 230 having a rod pallet 232 on which the pre-processing material is seated and an unloading pallet 236 on which the post-processing material is to be seated. Microdrill step grinding machine, characterized in that. delete According to claim 1, wherein the carriage 240 is fixed to the bed 120, the X-axis feed rail 262 and the Y-axis feed rail for selectively reciprocating along the X-axis feed rail 262 ( 256, a Z-axis feed rail 242 selectively reciprocating along the Y-axis feed rail 256, and the material to the spindle 228 while selectively reciprocating along the Z-axis feed rail 242 And a rotor (250) that selectively rotates for loading and unloading, wherein the rotor (250) is formed with two rod and unload feed chucks (252). 2. The roughing machine (310) according to claim 1, wherein the roughing machine (310) includes a roughing base plate (312) for selectively reciprocating in the direction of the center axis of the material on the upper surface of the bed (120) and an upper portion of the roughing base plate (312). A microdrill step grinding comprising a spin motor 314 fixed on a surface and a rough blade 316 which is rotated while mounted to the spin motor 314 to grind the material approximately horizontally in the axial direction thereof. machine. According to claim 1, wherein the finishing machine 320 is a finishing base plate 322 to selectively reciprocate in the direction of the center axis of the material on the upper surface of the bed 120, and the top of the finishing base plate 322 A microdrill step grinding machine comprising: a spin motor 324 fixed on a surface; and a finishing blade 326 that is rotated while being mounted to the spin motor 324 to grind the material perpendicularly to the axial direction thereof. . 7. The microdrill step grinding machine according to any one of claims 5 to 6, wherein the finishing edge (326) is machined in the rear adjacent to the roughing edge (316). The method of claim 6, wherein the movement means of the finishing base plate 322 is a conveyance rail 323 is formed on the upper surface of one side of the finishing base plate 322 in an oblique line, the guide rail 323 in the guide 336 ) Is inserted into the guide 336, the screw shaft 334 is screwed in a direction perpendicular to the finishing base plate 322, the screw shaft 334 is connected to the sub-motor 332 Microdrill step grinding machine.

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