DE102013109591B4 - Soldered steel bar to form a cutting tool, as well as soldered cutting tool - Google Patents

Abstract

Soldered bar steel (10, 10A, 10B, 10C) for a cutting tool comprising: a handle blank (11, 11A) integrally formed and including a first through hole (111) axially through the handle blank (11, 11A) is trained; and a replaceable head blank (12, 12A, 12B, 12C) securely fixed to a front end face of the handle blank (11, 11A) and a pre-machining area (122, 122A, 122B, 122C); and a soldering portion (121, 121B, 121C) formed on a rear end surface of the pre-machining portion (122, 122A, 122B, 122C) and protruding therefrom in the first through hole (111) of the handle blank (11, 11A) is fixed, and with the handle blank (11, 11A) is soldered.

Description

1. Field of the invention

The present invention relates to a brazed bar to form a cutting tool and a brazed cutting tool used for milling, boring, drilling or tapping.

2. Description of the Related Art

Heads of cutting tools are formed in various shapes according to their functions as cutting tools. For example, a cutting tool with a pointed head is used to drill holes in a workpiece. In addition, a flat head machining tool is used to mill the workpiece or to cut threads in the holes of the workpiece.

A conventional cutting tool comprises a clamping handle and a shank. The clamping handle can be made of stainless steel, carbon steel or tungsten steel. The clamping handle comprises a recess which is formed in an end face of the clamping handle au. The shank may be made of tungsten steel and includes a head formed at a forward end of the shank. When the stem is assembled with the clamp handle, the clamp handle is preheated to increase the notch of the clamp handle. Then, a rear end of the shaft is secured in the recess of the clamping handle. As the clamping handle cools, the recess of the clamping handle is reduced. Accordingly, the rear end of the shaft is fixedly mounted in the recess of the clamping handle.

In use, the clamping grip of the conventional cutting tool is mounted and clamped in a chuck of a processing machine, and the head of the shank is directed to a workpiece. If the clamping handle, as well as the shaft with the; Chuck is rotated, the head of the shaft mills the workpiece or drills holes in the workpiece.

The document CH 262 729 A discloses a masonry drill set comprising a shank with a central opening. Three cemented carbide inserts are symmetrically soldered into three radial slots along one end surface of the shaft. A center hole serves to supply coolant to the drill head and remove the drilling dust.

The publication DE 600 12 784 T2 relates to a cutting tool with a shank and a cutting body. The shaft includes a central bore for receiving a head. The cutting body presses against the shaft and has a cavity which engages with a locking device of the head and locks it mechanically.

The document DE 102 22 040 A1 discloses a milling tool including a double-walled sleeve-shaped shaft and a milling head which is held coaxial with the shaft, wherein the milling head is permanently connected to the shaft, for example by soldering.

The document DE 66 10 210 U relates to a drill for the production of boreholes in building materials comprising a tubular shaft, a drill head and a slot for the removal of the drilling dust. The drill head includes webs, which are thereby attached to the front end of the shaft and engage in corresponding recesses on the shaft.

The publication DE 11 2006 002 926 B4 relates to an end mill comprising a shank and a body having a plurality of helical grooves serving as a drill head, an inlet path being formed axially inside the end mill passing through the rear end surface of the shank and toward the body.

The publication DE 36 36 798 A1 refers to a method of making one-piece stem-type sintered cutting tools with a hollow shaft that serves as the coolant channel. The hollow shaft includes a piston, a drill head and a coolant passage formed by the piston and the drill head. However, when rotated at high speed and the workpiece is milled or drilled, the conventional cutting tool is exposed to high torque. Since the shank is only fixedly mounted in the clamping grip, the shank breaks easily, in particular at a connecting region in which the shank and the clamping grip are connected to one another. Since the conventional cutting tool easily wears and tears, the quality of milling or boring with the conventional cutting tool is low, and the danger of using the conventional cutting tool is high.

The main objective of the present invention is to provide a brazed cutting tool and a brazed bar to form the brazed cutting tool. The soldered steel bar includes a handle blank and a head blank. The handle blank comprises a first passage opening, which is formed axially by the handle blank. The head blank comprises a soldering area which projects into the first through opening and is soldered to the handle blank. The soldered bar steel is machined to form the soldered cutting tool. That was soldered The cutting tool comprises a handle formed by machining the head blank and includes a head formed by machining the head blank.

With the first through hole, which is formed in the handle blank, the head blank can be firmly soldered to the handle blank. When the head blank is replaced with a new one, solder in the first through hole can be completely cleaned. In addition, when the soldered cutting tool is used, a cooling liquid may be injected into the first through hole to cool the soldered cutting tool.

IN THE DRAWINGS:

1 Fig. 13 is an exploded perspective view of a first embodiment of a soldered bar steel according to the present invention;

2 is a side sectional view of the first embodiment of the steel bar 1 ;

3 is an exploded perspective view of a first embodiment of a brazed cutting tool according to the present invention, wherein the first embodiment of the brazed machining tool by machining the first embodiment of the bar steel 1 is formed;

4 is a side view of the first embodiment of the soldered cutting tool 3 in partial section;

5 Fig. 11 is an exploded perspective view of a second embodiment of a soldered bar according to the present invention;

6 is a side sectional view of the second embodiment of the steel bar 5 ;

7 is a side view of a second embodiment of a soldered cutting tool according to the present invention in partial section;

8th Fig. 11 is an exploded perspective view of a third embodiment of a soldered bar according to the present invention;

9 is a side sectional view of the third embodiment of the steel bar 8th ;

10 is a side view of a third embodiment of a brazed cutting tool according to the present invention in partial section, wherein the third embodiment of the brazed machining tool by machining the third embodiment of the steel bar 8th is trained;

11 Fig. 13 is an exploded perspective view of a fourth embodiment of a soldered bar steel according to the present invention;

12 is a side view of the fourth embodiment of the steel bar 11 in partial section; and

13 is a side view of a fourth embodiment of a soldered cutting tool according to the present invention in partial section, wherein the fourth embodiment of the soldered cutting tool by machining the fourth embodiment of the steel bar 11 is trained.

With reference to the 1 and 2 comprises a first preferred embodiment of a soldered bar steel 10 according to the present invention, a handle blank 11 , a head blank 12 and an end cap 13 ,

The handle blank 11 is cylindrical, may be made of stainless steel, carbon steel or tungsten steel, and includes a front end surface, a rear end surface and a first through hole 111 , The first passage opening 111 is axially in the handle blank 11 and through the front face and the rear face of the handle blank 11 educated. Preferably, a diameter Rh of the first passage opening 111 one quarter to one half of a diameter R1 of the handle blank 11 ,

The head blank 12 is safe on the front face of the handle blank 11 can be made of high-hardness materials such as tungsten steel, polycrystalline diamond (PCD), cubic boron nitride (CBN), ceramics or the like, and includes a pre-processing region 122 and a soldering area 121 , The pre-processing area 122 is cylindrical and includes a rear end face. The rear face of the pre-processing area 122 corresponds to the front face of the handle blank 11 , The soldering area 121 is at the rear end face of the pre-machining area 122 formed and protrudes from it is in the first through hole 111 of the handle blank 11 attached and is with the handle blank 11 soldered.

The end cap 13 is at the rear end face of the handle blank 11 attached and includes an end face and a connection protrusion 131 , The end face of the end cap 13 corresponds to the rear end face of the handle blank 11 , The connection projection 131 is in the end face of the end cap 13 formed and protrudes from it is in the first through hole 111 of the handle blank 11 attached and is in the handle blank 11 tight fit.

In particular, the handle blank 11 and the pre-processing area 122 circular in cross-section. The first passage opening 111 of the handle blank 11 is circular in cross section. The soldering area 121 of the head blank 12 and the connection projection 131 the end cap 13 correspond to the first passage opening 111 of the handle blank 11 and are also circular in cross section. Alternatively, the handle blank 11 and the pre-processing area 122 be polygonal in cross section. The first passage opening 111 of the handle blank 11 can be polygonal in cross section. The soldering area 121 of the head blank 12 and the connection projection 131 the end cap 13 correspond to the first passage opening 111 of the handle blank 11 and may also be polygonal in cross-section.

The above soldered bar steel 10 can be machined to form a soldered cutting tool. A diameter of the soldering area 121 of the head blank 12 and a ratio of the length of the handle blank 11 to a length of the head blank 12 are chosen according to the type of brazed cutting tool. The soldered cutting tool may be a drill or a milling cutter.

With further reference to the 3 and 4 is a first preferred embodiment of a brazed cutting tool 20 according to the present invention by processing the above-mentioned first preferred embodiment of the soldered bar steel 20 educated. The first preferred embodiment of the soldered cutting tool 20 includes a handle 21 , a head 22 and the endcap 13 ,

The handle 21 is made by machining the handle blank 11 formed and includes a clamping area 211 a shaft 212 , several spiral grooves 213 , a front end surface and a rear end surface. The clamping area 211 includes a front end and a rear end. The shaft 212 protrudes axially from the front end of the clamping area 211 and includes an outer surface and a distal end. The front face of the handle 21 is at the distal end of the shaft 212 Are defined. The rear face of the handle 21 is at the rear end of the clamping area 211 Are defined. A diameter of the shaft 212 is shorter than a diameter of the clamping area 211 , The spiral grooves 213 of the handle 21 are on the outer surface of the shaft 212 educated. The first passage opening 111 is axially through the clamping area 211 and the shaft 212 of the handle 21 Are defined.

The head 22 is created by editing the pre-editing area 122 of the head blank 12 is formed securely on the front face of the handle 21 attached, is secure at the distal end of the shaft 212 of the handle 21 attached and includes a processing area 221 , several spiral grooves 222 and the soldering area 121 , The editing area 221 includes an outer surface and a rear end surface. The rear face of the machining area 221 corresponds to the front face of the handle 21 and corresponds to the distal end of the shaft 212 of the handle 21 , The spiral grooves 222 Of the head 22 are on the outer surface of the editing area 221 trained and communicate with each of the spiral grooves 213 of the handle 21 , The soldering area 121 of the head blank 12 is at the rear end face of the machining area 221 Of the head 22 defined, in the first passage opening 111 of the handle 21 attached and is with the handle 21 soldered.

The end cap 13 is at the rear end face of the handle 21 attached and is at the rear end of the clamping area 211 of the handle 21 attached. The connection projection 131 the end cap 13 is in the first through hole 111 of the handle 21 attached and is firmly in the handle 21 used.

With reference to the 5 and 6 is in a second preferred embodiment of a soldered bar steel 10A According to the present invention, a diameter R2 of the pre-machining area 122A of the head blank 12A different from the diameter R1 of the handle blank 11A , In particular, the diameter R2 of the head blank 12A greater than the diameter R1 of the handle blank 11A be.

In reference to 7 is in a second preferred embodiment of a soldered cutting tool 20A according to the present invention, the head 22A stretched and has a length to that of a length of the handle 21A approaches.

With reference to the 8th and 9 comprises in a third preferred embodiment a soldered bar steel 10B according to the present invention, the head blank 12B a uniform diameter. The diameter R2 of the pre-machining area 122B of the head blank 12B is equal to a diameter Rs of the soldering area 121B of the head blank 12B ,

With further reference to 10 is a third preferred embodiment of a brazed cutting tool 20B according to the present invention by processing the above-mentioned third preferred embodiment of the soldered bar steel 10B educated. The pre-processing area 122B of the head blank 12B of the soldered bar steel 10B is edited to the editing area 221B Of the head 22B of the soldered cutting tool 20B train. An outer diameter R2 'of the cutting tool 221B is equal to the diameter Rs of the soldering area 121B Of the head 22B , Accordingly, the head includes 22B a uniform diameter.

With reference to the 11 and 12 comprises in a fourth preferred embodiment of a soldered bar steel 10C according to the present invention, the head blank 12C Further, a second passage opening 123C , The second passage opening 123C is axially through the head blank 12C educated.

With further reference to 13 is a fourth preferred embodiment of a brazed cutting tool 20C according to the present invention by the processing of the above-mentioned fourth preferred embodiment of the soldered bar steel 10C educated. The pre-processing area 122C of the head blank 12C of the soldered bar steel 10C is edited to the editing area 221C Of the head 22C of the soldered cutting tool 20C train. The second passage opening 123C will be in the editing area 221C and the soldering area 121C Of the head 22C Are defined.

The soldered cutting tool 20 . 20A . 20B . 20C and the soldered steel bar 10 . 10A . 10B . 10C to the soldered cutting tool 20 . 20A . 20B . 20C as described, have the following advantages.

When the soldering area 121 . 121B . 121C of the head blank 12 . 12A . 12B . 12C in the first passage opening 111 of the handle blank 11 . 11A is inserted and with the handle blank 11 . 11A is soldered, heated and expands the air in the first through hole 111 of the handle blank 11 . 11A is available. The expanding air may be from the rear end face of the handle blank 11 . 11A be used up. Thus, the soldering area 121 . 121B . 121C of the head blank 12 . 12A . 12B . 12C and the solder around the soldering area 121 . 121B . 121C not from the first through hole 111 be pushed out due to the expanding air. Accordingly, with the passage opening, which in the handle blank 11 . 11A is defined, the soldering area 121 . 121B . 121C of the head blank 12 . 12A . 12B . 12C safe with the handle blank 11 . 11A get connected.

Besides, if the head 22 . 22A . 22B . 22C of the soldered cutting tool 20 . 20A . 20B . 20C worn out and due to long-term use breaks, the head 22 . 22A . 22B . 22C be replaced by a new one. The end cap 13 gets from the handle 21 . 21A first solved and then becomes an area where the head 22 . 22A . 22B . 22C and the handle 21 . 21A are connected, heated. Thus, the solder becomes between the head 22 . 22A . 22B . 22C and the handle 21 . 21A melted. Then, a liquid under high pressure in the first passage opening 111 injected or a pin is in the first through hole 111 from the rear end face of the handle 21 . 21A introduced to the head 22 . 22A . 22B . 22C and the solder from the first through hole 111 to slide out. Consequently, the soldering area 121 . 121B . 121C Of the head 22 . 22A . 22B . 22C for exchange firmly in the first passage opening 111 of the handle 21 . 21A be soldered.

In addition, when the first to third embodiments of the soldered cutting tools 20 . 20A . 20B as used, the end caps 13 from the handle 21 . 21A be solved to allow a cooling liquid, in the first passage opening 111 from the rear end face of the handle 21 . 21A to be injected. The cooling liquid flows out of the first passage opening 111 out and flows along an outer surface of the handle 21 . 21A to the head 22 . 22A . 22B . 22C out. Thus, the cooling liquid cools the head 22 . 22A . 22B . 22C down, which by friction between the head 22 . 22A . 22B . 22C and a workpiece is heated. In addition, when the fourth embodiment of the soldered cutting tool flows 20C is used, the cooling liquid further into and through the second passage opening 123C Of the head 22C to the fourth embodiment of the cutting tool 20C cool.

Claims (12)

Soldered steel bars ( 10 . 10A . 10B . 10C ) for a cutting tool, comprising: a handle blank ( 11 . 11A ), which is integrally formed and which has a first passage opening ( 111 ) which passes axially through the handle blank ( 11 . 11A ) is trained; and a replaceable head blank ( 12 . 12A . 12B . 12C ), which securely on a front end face of the handle blank ( 11 . 11A ) and a pre-processing area ( 122 . 122A . 122B . 122C ); and a soldering area ( 121 . 121B . 121C ), which at a rear end face of the pre-processing area ( 122 . 122A . 122B . 122C ) and projects therefrom, in the first passage opening ( 111 ) of the handle blank ( 11 . 11A ) and with the handle blank ( 11 . 11A ) is soldered. Soldered steel bars ( 10 . 10A . 10B . 10C ) according to claim 1, further comprising an end cap ( 13 ), which at a rear end face of the handle blank ( 11 . 11A ), the end cap ( 13 ) one Connection projection ( 131 ), which on an end face of the end cap ( 13 ) and projects therefrom, in the first passage opening ( 111 ) of the handle blank ( 11 . 11A ), and fixed in the handle blank ( 11 . 11A ) is fitted. Soldered steel bars ( 10C ) according to claims 1 or 2, wherein the head blank ( 12C ) further comprises a second passage opening ( 123C ), which axially through the pre-processing area ( 122C ) and the soldering area ( 121C ) of the head blank is formed. Soldered steel bars ( 10A . 10B . 10C ) according to claim 1, 2 or 3, wherein a diameter (R1) of the handle blank ( 11A ) different from a diameter (R2) of a pre-processing area ( 122A . 122B . 122C ) of the head blank ( 12A . 12B . 12C ). Soldered steel bars ( 10B . 10C ) according to claim 1, 2 or 3, wherein a diameter (R2) of the pre-processing area ( 122B . 122C ) of the head blank ( 12B . 12C ) equal to a diameter (Rs) of the soldering area ( 121B . 121C ) of the head blank ( 12B . 12C ). Soldered cutting tool ( 20 . 20A . 20B . 20C ), which comprises: a handle ( 21 . 21A ), which is integrally formed and which has a first passage opening ( 111 ), which axially through the handle ( 21 . 21A ) is trained; and a replaceable head ( 22 . 22A . 22B . 22C ), which securely on a front end face of the handle ( 21 . 21A ) and a processing area ( 221 . 221B . 221C ) and a soldering area ( 121 ), which at a rear end face of the processing area ( 221 . 221B . 221C ) and projects therefrom, in the first passage opening ( 111 ) of the handle ( 21 . 21A ) and with the handle ( 21 . 21A ) is soldered. Soldered cutting tool ( 20 . 20A . 20B . 20C ) according to claim 6, wherein the head ( 22 . 22A . 22B . 22C ) further a plurality of spiral grooves ( 222 ), which on an outer surface of the processing area ( 221 . 221B . 221C ) Of the head ( 22 . 22A . 22B . 22C ) are formed. Soldered cutting tool ( 20 ) according to claim 6, wherein the handle ( 21 ) a clamping area ( 211 ) and a shaft ( 212 ) axially of a front end of the clamping area ( 211 protruding), wherein a diameter of the shaft ( 212 ) of the handle ( 21 ) shorter than a diameter of the clamping area ( 211 ) of the handle ( 21 ) and the first passage opening ( 111 ) axially through the clamping area ( 211 ) and the shaft ( 212 ) of the handle ( 21 ) is defined. Soldered cutting tool ( 20 ) according to claim 8, wherein the handle ( 21 ) further a plurality of spiral grooves ( 213 ), which on an outer surface of the shank ( 212 ), and the head ( 22 . 22A . 22B . 22C ) further a plurality of spiral grooves ( 222 ), which on an outer surface of the processing area ( 221 . 221B . 221C ) Of the head ( 22 . 22A . 22B . 22C ) are formed and correspondingly with the spiral grooves ( 213 ) of the handle ( 21 ) communicate. Soldered cutting tool ( 20B . 20C ) according to claim 6 or 7, wherein an outer diameter (R2 ') of the processing area ( 221B . 221C ) equal to a diameter (Rs) of the soldering area ( 121 . 121C ) Of the head ( 22B . 22C ). Soldered cutting tool ( 20C ) according to claim 6, 7, 8, 9 or 10, wherein the head ( 22C ) further comprises a second passage opening ( 123C ) axially through the processing area (FIG. 221C ) and the soldering area ( 121C ) Of the head ( 22C ) is trained. Soldered cutting tool ( 20 . 20A . 20B . 20C ) according to claim 6, 7, 8 or 9, further comprising an end cap ( 13 ), which at a rear end face of the handle ( 21 . 21A ), wherein the end cap ( 13 ) a connection projection ( 131 ), which at an end face of the end cap ( 13 ) and projects therefrom, in the first passage opening ( 111 ) of the handle ( 21 . 21A ) and firmly in the grip ( 21 . 21A ) is fitted.

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