KR100933348B1 - Straight - Google Patents

Abstract

PURPOSE: A cemented carbide hetero-metal straight blank material for a micro cutting tool and a micro-drill manufacturing method using the same are provided to manufacture a micro cutting tool with low cost by cemented carbide blank material on a shank material through adhesive or a welding method. CONSTITUTION: A cemented carbide hetero-metal straight blank material for a micro cutting tool is fixed on a material housing portion(21) of a shank material(20). A material insertion joint is formed on the cross section of the shank material and a cemented carbide hetero-metal straight blank material(22) is inserted into a material insertion junction without exposure. The cemented carbide hetero-metal straight blank material is fixed on the material insertion junction through adhesive or welding.

Description

Cemented carbide dissimilar metal straight blanks for micro cutting tools and manufacturing method of micro drills using the same {Straight}

The present invention relates to a cemented carbide dispersed metal straight (Straight) blank material for micro cutting tools and a method for manufacturing a micro drill using the same. More specifically, the hole is inserted into the material insertion joint so that the cemented carbide material can be inserted into one end surface of the shank material. It provides micro cutting tool material which is inserted and fixed so that cemented carbide blank material is not exposed by processing it.The micro cutting tool (drill, end mill, router), etc. can be manufactured by finishing it once while supporting the shank material and cemented carbide material. The present invention relates to a cemented carbide dispersing metal straight cutting material for micro cutting tools and a method of manufacturing a micro drill using the same.

Drill, end mill, and router drill processing are one of the most basic processing methods among the machining technologies, and as the high-tech industry develops, they are gradually increasing in speed. Up is required.

With the recent development of advanced medical equipment and small new materials, micro-level drill processing is being performed. Therefore, it is urgent to develop new drills of micro-class cutting tools for these devices and to evaluate the manufacturing cost, processability and reliability of new cutting tool materials. It is a situation that needs to be done.

Such a micro drill is a first step of the micro-drill of the applicant, as disclosed in the invention patent No. 0711240 (2007. 04. 18. registration), the first step of roughing; Installing the rough micro drill into the spindle; Cooling water cooling step of diluting 10% diamond powder of 1,600 ~ 2,400 mesh in oil or water to maintain 18 ~ 15 ℃; Supplying and circulating cooling water to a cooling tank containing a sponge; Spinning the spindle installed with a micro drill at high speed and reciprocating up and down was prepared through the step of wrapping the blade diameter in the sponge and cooling water for 30 ~ 40sec.

Various other micro-drills are manufactured and processed and developed. As a material for processing the micro-drills, as shown in FIG. 1, the blanks were provided with a cemented carbide 10. Since the cemented carbide 10 is made of cemented carbide, the material is expensive, and when the micro drill is processed and manufactured, the micro cutting tool has to be sold at an expensive price of about 600 won.

As another cemented carbide material for producing a micro-drill, as shown in FIG. 2, only the blade portion is made of cemented carbide 12, and the shank material is made of SUS or carbon steel 11, and the cemented carbide 12 and carbon steel. Carbide carbide (12) is connected along the planar butt weld line (16) of the part where it meets (11) by machining the cemented carbide (12) part to produce a micro-drill, and the cemented carbide due to metal deformation due to weld 16 and different materials Cracks cause defects.

And all of them have the advantage of 30% cost reduction compared to solid blank material consisting of cemented carbide (10), but this also had the drawback that the economic effect is lowered due to the rise in cost due to defects and secondary and tertiary processing.

As another material for producing a micro-drill, as shown in Figure 3, the fixing hole for fixing the cemented carbide 14 made of about 1.5mm in diameter on one end of the shank material made of SUS or carbon steel 13 After molding (15), the cemented carbide blanks are fixed to the shank fixing holes 15 by adhesive or silver soldering, and then the outer diameter of the cemented carbide 14 is processed to 0.5 mm or less to produce micro drills.

However, in order to process and produce micro drills, the part of the shank material 13, which is carbon steel, is fixed to the collet chuck 30, and then the outer diameter of the cemented carbide 14 is supported by the material processing support 31 at the outer diameter of the diamond wheel particles ( The insert type in which the cemented carbide 14 is exposed in the shank in the process of machining the required microdrill blades at once by using the wheel 32 made of 33) cannot use a pedestal that supports the blank during machining. Carbide blank micro cutting tool blade diameter is easily broken during special grinding process, which makes it difficult to machine, and even after processing, it is difficult to finish the process without roundness without the roundness. Compared to the cemented carbide (10), the economical efficiency is lowered because the processing cost is greatly improved. Will be a 25% cost savings compared to lure Jean material, there was a drawback that can not be popularized.

The present invention is devised to solve such a conventional defect, S45c, S55c carbon steel / SK3, SKS tool steel / SUJ2 bearing steel / SKT, SKD11 dice steel / SKH, HSS high speed steel / SUS stainless steel / metal powder extrusion shank / Lee The hard alloy dissimilar metal straight blank material is machined in one side of the shank material made of material such as silicad metal, and the hole can be inserted completely without exposure to the shank. After making the shank material rockwell hardness more than 62 °, wash the surface of the shank material, insert the cemented carbide or powder into the cemented carbide joint and insert it with lead and flux, and then place the electrode on the cemented blank inserted surface. 500 ~ 750 ℃] and welded shank material with centerless grinding equipment to precisely process outer diameter Ø3.17mm / Managing Dimensional Tolerance ± 0.001mm] The development of micro-binder dissimilar metal straight blank material enables the micro cutting tool production processing equipment used by domestic and foreign companies in the world to be processed without any problem. Its purpose is to provide cemented carbide-reduced dissimilar metal straight blank materials that can be used in steel mills, end mills and router drills.

The present invention is used to support the carbide blank material with a pedestal using a cemented carbide dissimilar metal straight (Straight) blank material for micro cutting tools, and micro-cutting tool drill by simultaneously finishing the cemented carbide blank material and the shank material inserted into the center of the shank with a diamond wheel It aims to be able to produce cutting tools of very small diameter (Ø30㎛) while improving productivity by reducing machining time.

The present invention is made of any one of S45c, S55c carbon steel / SK, SKS tool steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, HSS high speed steel / SUS stainless steel / metal powder extrusion shank /, liquid metal material ( 20) Carbide alloy dissimilar metal straight blank material is formed at the center of one side of the cutting plane, and the cemented carbide dissimilar metal straight blank material is fixed to be integral with adhesive or welding by forming a material insertion joint that can be inserted without exposing the cemented carbide blank to the outside of the shank material. It is characterized by.

The present invention is a material production step of producing a cemented carbide dissimilar metal straight blank material with a shank material and cemented carbide;

Cutting the shank material and forming a material insertion joint to insert a cemented carbide dissimilar metal straight blank material into one center of a cutting surface, and forming a material insertion joint to chamfer the opposite corner (C);

Shank material heat treatment step of performing any one of vacuum heat treatment, high frequency heat treatment, carburizing heat treatment according to the material of the molded shank material;

Cemented carbide blank material fixing step of cutting the cemented carbide dissimilar metal straight blank material by inserting the cemented carbide dissimilar metal straight blank material to the material insertion joint without exposing to the outside of the shank material, and then fixing it by bonding or welding;

Cemented carbide dissimilar metal straight blank material is fixed to collet chuck of ultra-precise CNC machined grinding equipment by fixing the shank material of cemented carbide dissimilar metal straight blank material through the wheel made of diamond grains. The shank material is characterized in that the molding through the step of performing the machining at a time.

The present invention is made of S45c, S55c carbon steel / SK3, SKS tool steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, SSH high speed steel / SUS stainless steel / metal powder extruded shank steel / liquid metal Carbide blank material can be inserted into one side of the shank material, and the cemented carbide blank material is fixed to prevent exposure of the cemented carbide blank material to the outside of the shank material by adhesive or welding method. Straight] to provide blank material.

The present invention is a micro cutting tool drill, end mill, router drill carbide alloy dissimilar metal blank material to support the shank material, while the wheel made of diamond grains at the same time at the same time finishing the cemented carbide blank material and the shank material micro cutting tool easily It is possible to manufacture and to lower the cost and to significantly reduce the defective rate by processing.

In the present invention, the cemented carbide blank material has a diameter of 1 mm and a depth of 15 mm is inserted to minimize the cemented carbide blank material, thereby reducing the cemented carbide blank material value and improving workability when machining micro cutting tool drills, end mills, router drills, and the like. It is intended to provide a low cost [micro cutting tool processing standards: Ø30㎛ ~ Ø500㎛ grade].

The present invention will be described in detail with reference to the accompanying drawings.

Figure 4 shows a cross-sectional view of the cemented carbide cutting different metal straight [Straight] blank material for micro-cutting tool of the present invention, the shank material 20 made of about Ø3.2mm and length of about 38mm may be made of various materials. It is preferably made of S45c, S55c carbon steel / SK3, SKS tool steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, HSS high speed steel / SUS stainless steel, metal powder extrusion shank steel / liquid metal.

The material insertion joint 21 for inserting the cemented carbide dissimilar metal straight blank material 22 into one side center of the cut side of the shank material 20 made of various materials is processed to form a circular hole using a drill.

Fix the cemented carbide dissimilar metal straight blank material 22 having a diameter of about Ø1.0mm that can be inserted into the material insertion joint 21, it is to be fixed by an adhesive or silver solder welding method.

The welding method is to fix a single piece using silver (Ag) or a material made of silver and a copper alloy.

After fixing the cemented carbide dissimilar metal straight blank material 22 to the material insertion joint 21 by an adhesive or welding method, it is preferable that the cemented carbide dissimilar metal straight blank material 22 does not protrude from the material insertion joint 21. .

After processing the material insertion joint 21 is to perform a heat treatment by performing a chamfer (C) on the opposite corner surface,

The reason for heat-treating the shank material 20 is to process the shank material 20 and the cemented carbide dissimilar metal straight blank material 22 at the same time when the diamond wheel is processed. It is to increase the wear of the diamond wheels, to produce the quality of the specifications without the ultra-precision processing of the blank material and the defect rate of the shape, to prolong the life of the diamond wheel, and to prevent rust on the surface during the distribution period after the finished product is shipped.

FIG. 5 is a front view of the preparation state for cutting the micro drill of the present invention, and FIG. 6 is a front view showing the state of cutting the micro drill of the present invention.

Cemented carbide dissimilar metal straight blank material 22 is integrally fixed to the raw material insertion joint 21, the shank material 20 is coupled to the collet chuck 30 of the conventional grinding equipment to enable low-speed rotation, cemented carbide dissimilar After the metal straight blank material 22 is in the protruding position, the material processing base 31 made of cemented carbide or artificial diamond 32a is a shank material 20 having a cemented carbide dissimilar metal straight blank [22]. Install so that it is supported by the outer diameter of.

At the tip of the shank material 20 is to enable the shank material 20 and the cemented carbide dissimilar metal straight blank material 22 to be finished at a time by using a diamond wheel 32 made of diamond particles 33.

7 is a cross-sectional view of the micro cutting tool of the present invention, which processes the shank material 20 and the cemented carbide dissimilar metal straight blank material 22 at a time to process the micro cutting tool 50 having the blade 40. The micro cutting tool 50 is a micro cutting tool drill, an end mill, a router drill, or the like, and can be applied to various other cutting tools.

The present invention consisting of this configuration consists of about 3.2mm in diameter and S45c, S55c steel / SK, SKS steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, HSS high speed steel / SUS stainless steel / metal powder extrusion shank steel / liqueur The shank material 20 made of a material such as demetal steel is processed and cut to have a length of about 38 mm, and a cemented carbide dissimilar metal straight blank material of about Ø1.0 mm using a drill in the center of the cut side 22. Shape the material insertion joint 21 to a depth of about 15mm so that can be inserted.

The material insertion joint 21 is subjected to any one of the heat treatment of vacuum heat treatment, high frequency heat treatment, carburizing heat treatment according to the shank material 20 so that the Rockwell hardness is 60 ° ~ 68 °, and the shank material 20 Provide washed.

The material insertion joint 21 is fixed to the cemented carbide dissimilar metal straight blank material 22 in one piece, surface cleaning is performed so that the adhesive and silver soldering well, the adhesive or powder is lead and flux-painted cemented carbide dissimilar metal straight blank Insert the material 22, place the electrode on the surface of the shank material 20, the instantaneous welding (500 ~ 750 ℃) at an electric high frequency and the outer diameter of the welded shank material 20 with the centerless grinding equipment precisely It is to provide cemented carbide dissimilar metal straight blank material with machining precision of Ø3.17mm and dimensional tolerance control of ± 0.001mm.

In the method of fixing the cemented carbide dissimilar metal straight blank material 22 using the adhesive, it is preferable to apply an adhesive to the cemented carbide dissimilar metal straight blank material 22 and insert the adhesive into the material insertion joint 21 to dry for 24 hours.

Expensive cemented carbide dissimilar metal straight blank material 22 used in the production of the micro cutting tool is supplied only a minimum of about Ø1.0mm to save more than 70% compared to the all-carbide alloy 10 currently used.

Limiting the diameter of the cemented carbide dissimilar metal straight blank material 22 to 1.0 mm has a drawback in that the economic efficiency decreases when the diameter is 1.0 mm or more, and the diameter of the micro cutting tool blade should be about Ø30 μm to Ø300 μm. This is because it is difficult to process the blade 40 of the micro cutting tool 50 such as the end mill, the router drill, etc., and the defect rate increases, so that the standard Ø3.17 mm of the shank material 20 is Ø30 μm to Ø300 μm at a time. It is most preferable to set the diameter as Ø1.0mm because it should be processed.

The finished cemented carbide material dissimilar metal blank material for the micro cutting tool is fixed by inserting the shank material 20 into the shank chucking collet chuck 30 of the grinding equipment, and the cemented carbide dissimilar metal straight blank material 22 is inserted into the shank material ( 20) is supported by the shank material processing base 31 made of cemented carbide or artificial diamond 31a on the outer diameter of the micro-cutting tool drill, end mill, router drill, etc. using the diamond wheel 32 made of diamond particles 33 The micro cutting tool 50 is processed.

In order to process the micro-cutting tool 50 consisting of the micro-cutting tool drill, end mill, router drill, etc., the wheel 32 made of diamond particles 33 rotates the collet chuck 30 at a diameter of Ø30 μm to Ø300 μm. Machining is performed by finishing at a time so that only the cemented carbide dissimilar metal straight blank material 22 remains.

The processing tolerance of the cemented carbide dissimilar metal straight blank material 22 is preferably set to 0.001 mm.

As shown in FIG. 6, when the wheel 32 performs the operation of the cemented carbide dissimilar metal straight blank material 22 and the shank material 20 at one time, the shank material processing support 31 is supported at the outer diameter of the shank material 20. This is to ensure that the machining is normally performed, and because the finishing operation can be performed at once, the machining is convenient, and the micro cutting tool 50 as shown in FIG. 7 can be processed without defects.

Hereinafter, preferred embodiments of the present invention will be described in detail through each step.

EXAMPLE

(One). Material production stage

S45c, S55c Carbon steel / SK, SKS tool steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, HSS high speed steel / SUS stainless steel / metal powder Extruded shank steel / liquid metal steel Ø3. By extruding to 2mm to produce the shank material 20 as a round bar.

The cemented carbide is extruded to a diameter of 1.0 mm and subjected to high temperature sintering to produce a cemented carbide dissimilar metal straight blank material 22 as a round bar.

(2). Insert step of inserting material

The shank material 20 is cut into a length of 38 mm so that the cemented carbide dissimilar metal straight blank material 22 can be inserted into one center of the cut surface. The material insertion joint 21 is drilled to have a diameter of Ø1 mm and a depth of 15 mm. Hole drilling in multi-axis lathes and chamfering (C) the opposite corner.

(3). Shank material heat treatment step

Depending on the material of the molded shank material 20, any one of the heat treatment of vacuum heat treatment, high frequency heat treatment, carburizing heat treatment is performed to heat treatment so that the Rockwell hardness is 60 ° ~ 68 °.

(4). Cemented carbide material

The cemented carbide dissimilar metal straight blank material 22 is cut to have a length of 15 mm, and the cemented carbide dissimilar metal straight blank material 22 is fixed to the material insertion joint 21 in one piece, and the surface is cleaned so that adhesion or silver solder welding is performed well. After the adhesive or powder is soldered and flux-coated, the cemented carbide dissimilar metal straight blank material 22 is inserted, and the electrode is placed on the surface of the shank material 20 and subjected to instantaneous welding (500-750 ° C.) at an electric frequency. The shank material 20 to the outer diameter is precisely processed by the centerless grinding equipment.

(5). Finishing steps

Micro-machining tool diameter processing Ultra-precise CNC milling machine collet chuck (30) of blank material processed by machining the shank material 20 fixed with cemented carbide dissimilar metal straight blank material 22 to the centerless grinding machine with diameter Ø3.17mm Cemented carbide dissimilar metal straight blank material 22 and the shank material 20 through the diamond wheel 32 made of diamond particles 33 while supporting the outer diameter of the shank material 20 by the material processing support 31 The micro cutting tool 50 having the blade 40 is machined by finishing the machining at once.

According to the present invention, a cemented carbide insert for cutting a micro-cutting tool is fixed to insert a cemented carbide blank material into one end surface of the shank material so that the cemented carbide blank material is not exposed. It can produce and support the shank material and the cemented carbide blank material at the same time, thereby improving productivity while reducing the defective rate of micro cutting tool drill, end mill and router drill.

1 is a front view of a conventional micro cutting tool material made of all cemented carbide;

Figure 2 is a front view of a micro cutting tool material consisting of a conventional cemented carbide and shank material

Figure 3 is a cemented carbide blank exposed insert micro-cutting tool for manufacturing a conventional cemented carbide alloy in combination with a fixed hole in the shank material.

Figure 4 is a cross-sectional view of the micro cutting tool in which the cemented carbide dissimilar metal straight blank material of the present invention is integrally fixed.

5 is a front view of a state ready for grinding the outer diameter of the micro cutting tool blade of the present invention.

6 is a front view showing a blank state in which the blade outer diameter of the micro cutting tool of the present invention is ground at a time;

7 is a cross-sectional view of a completed state of the micro cutting tool of the present invention.

[Description of Symbols for Main Parts of Drawing]

10: all cemented carbide 11, 13, 20: shank material

12, 14: cemented carbide 15: fixing hole

16: welding part 21: insert material joint

22: cemented carbide dissimilar metal straight blank material

30: collet chuck 31: material processing support

32: wheel 33: diamond particles

40: blade 50: micro cutting tool

C: Chamfer

Claims (7)

S45c, S55c carbon steel / SK, SKS tool steel / SUJ2 bearing steel / SKT, SKD dice steel / SKH, HSS high speed steel / SUS stainless steel / metal powder extrusion shank steel /, made of any one of the material of the shank metal (20) A cemented carbide dissimilar metal straight blank material 22 is formed at one center of the cut surface to form a material insertion joint 21 which can be inserted without exposure to the outside of the shank material 20, and the cemented carbide dissimilar metal straight blank material 22 is formed of a material. Carbide alloy dissimilar metal straight blank material for micro-cutting tool, characterized in that fixed to be integrally formed by an adhesive or welding in the insert joint (21). The method of claim 1, Cemented carbide for micro-cutting tool, characterized in that the diameter of the material insertion joint 21 for inserting and fixing the cemented carbide dissimilar metal straight blank material 22 into the shank material 20 without exposure is 1.0 mm, depth 15 mm. Dissimilar Metal Straight Blank Material. Material production step of producing a cemented carbide dissimilar metal straight blank material 22 with the shank material 20 and cemented carbide; Cutting the shank material 20 to form a material insertion joint 21 so that the cemented carbide dissimilar metal straight blank material 22 can be inserted in one center of the cut surface and forming a material insertion joint to chamfer the opposite corner (C) step; Shank material heat treatment step of performing any one of the heat treatment of vacuum heat treatment, high frequency heat treatment, carburizing heat treatment according to the material of the molded shank material (20); Cemented carbide blank material fixing step of cutting the cemented carbide dissimilar metal straight blank material 22 by inserting the cemented carbide dissimilar metal straight blank material 22 into the material insertion joint 21 without exposing to the outside of the shank material and then fixing it by bonding or welding. ; The outer surface of the shank material 20 is supported by the material processing support 31 by fixing the shank material 20 to which the cemented carbide dissimilar metal straight blank material 22 is fixed to the collet chuck 30 of the ultra-precision CNC cutting machine. While forming the micro-alloy dissimilar metal straight blank material 22 and the shank material 20 through one step at the same time through the wheel 32 made of diamond particles (33) for forming the micro-cutting tool Manufacturing method of micro drill using cemented carbide dissimilar metal straight blank material. The method of claim 3, wherein The material production stage is made of any one of S45c, S55c carbon steel, SK, SKS tool steel, SUJ2 bearing steel, SKT, SKD dice steel, SKH, HSS high speed steel, SUS stainless steel, metal powder, extruded shank steel, and liquid metal. 20) A method of manufacturing a micro drill using a cemented carbide dissimilar metal straight blank material for micro cutting tools, characterized in that consisting of. The method of claim 3, wherein Insert insertion joint forming step is a method of manufacturing a micro drill using a cemented carbide dissimilar metal straight blank material for micro-cutting tool, characterized in that the diameter of the insert insert portion 21 is formed to 1.0mm, depth 15mm. The method of claim 3, wherein The heat treatment step of the shank material is a vacuum heat treatment, a high frequency heat treatment, according to the material of the shank material 20 that chamfers (C) the opposite corner of the material insertion adhesive portion 21 of the shank material 20 having an outer diameter of 3.2 mm and a length of 38 mm. A method of manufacturing a micro-drill using a cemented carbide dissimilar metal straight blank material for a micro cutting tool, characterized by performing a heat treatment of carburizing heat treatment so as to have a Rockwell hardness of 60 ° to 68 °. The method of claim 3, wherein The cemented carbide blank material fixing step is to cut the cemented carbide alloy dissimilar metal straight blank material 22 to have a length of 15 mm, and fix the cemented carbide dissimilar metal straight blank material 22 to the material insertion joint 21 integrally, After cleaning the surface to make silver solder well, insert the cemented carbide dissimilar metal straight blank material 22 by soldering and fluxing with adhesive or powder silver, and placing the electrode on the surface of the shank material 20 and welding it at an instantaneous electric frequency (Centigrade). 500 ~ 750 ℃) manufacturing method of micro drill using a cemented carbide dissimilar metal straight blank material for micro cutting tools.

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