TWI650198B - Low temperature cutter - Google Patents

Abstract

A low temperature cutting tool holder comprising a cutter body, a pull bolt and an adjusting unit, the handle body comprising an inner hole communicating from an inner end to an outer end, the pull bolt being mounted on an inner end of the handle body and comprising a a connecting hole connected to a positioning end and communicating with the inner hole, the adjusting unit includes a connecting rod disposed in the through hole, and a elasticity for providing the connecting rod to keep protruding toward the connecting end The connecting rod has a flow guiding hole communicating with the inner hole. By using the adjustment unit, when the tool holder is mounted on a spindle unit and clamped by a jaw, the connecting rod and the spindle unit are kept in airtight contact, thereby avoiding the low temperature fluid for cooling. Vaporization and depressurization occur in the inner hole to ensure the cooling effect of the low temperature fluid on a processing end.

Description

Low temperature cutter

The present invention relates to an accessory for a machine tool, and more particularly to a low temperature cutting tool holder.

The spindle unit of a general machine tool uses a clamping jaw to clamp a pull bolt of a knife handle, so that an assembled end of the knife handle can be stably fit inside the spindle unit (such as TW certificate number M534055). No., M541362 and other patent cases are disclosed).

As shown in FIG. 1 and FIG. 2, when a jaw 101 of a spindle unit 1 is operated in an open state, and a knife handle 2 is nested inside the spindle unit 1, a pull pin 201 of the knife handle 2 is shown. It can be abutted against the bottom of a pull rod head 102 of the spindle unit 1. The pull bolt 201 has an enlarged head portion 202. At this time, the jaw 101 has not yet clamped the pull bolt 201 of the tool holder 2.

As shown in FIG. 3, when the jaw 101 of the spindle unit 1 is slightly moved upward in the axial direction, and the jaw 101 is operated in a clamping state, the head 202 of the pull bolt 201 can be clamped by the clip. The claw 101 is clamped, and at this time, a distance is generated between the head 202 of the pull bolt 201 and the pull rod head 102.

Although the above-described tool holder 2 is detachably mounted to the spindle unit 1, when the spindle unit 1 and the tool holder 2 are applied to machining operations in the industry or the aerospace industry, it is necessary to process a high-speed, thin workpiece. At the time, the low temperature fluid must be used to cool the processed part to avoid the phenomenon of fusion of the workpiece, and the general low temperature fluid [the temperature of the low temperature cutting process is divided into three zones, namely the sub-normal zone (2-6 ° C), low temperature. The zone (0-30 ° C) and the ultra-low temperature zone (<-50 ° C) may use liquid nitrogen. When the cryogenic fluid is transported along the center of the spindle unit 1 and passes through the tie rod head 102, the head 202 and the The spacing is generated between the tie rod heads 102, because the volume of the closed space in the system changes, the flow path produces a pressure drop from a small volume change, and the low temperature fluid also causes vaporization due to the pressure drop relationship (such as the arrow of FIG. 3). As shown in the figure), for this reason, the low temperature temperature changes when the cryogenic fluid reaches the processing tip, and the low temperature cutting effect is not good.

Therefore, the existing tool holder design, if applied to the processing needs of the aerospace industry, may still cause the workpiece to be melted.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a low temperature cutting blade which allows a low temperature fluid to be delivered to a processing tool tip to be vaporized and which prevents the workpiece from being melted.

Thus, the low temperature cutting tool holder of the present invention comprises a tool holder body, a pull bolt and an adjusting unit. The blade body extends along an axis and includes an inner end, an outer end opposite the inner end along the axis, and an extension along the axis and the inner end The side end is connected to the inner hole of the outer end. The pull bolt extends along the axis and is mounted on the inner end of the handle body, and includes a positioning end adjacent to the inner end, a connecting end opposite to the positioning end along the axis, a line along the axis and the connecting end A perforation that communicates with the positioning end and communicates with the inner bore. The adjusting unit includes a connecting rod disposed in the through hole of the pull bolt, an elastic member that provides the connecting rod to constantly protrude outwardly of the connecting end of the pulling bolt, and a leakage preventing ring having a leakage preventing ring An abutting portion disposed outside the connecting end of the pull bolt, and a guiding hole communicating with the inner hole, the abutting portion is disk-shaped and has an end surface perpendicular to the axis, the guiding hole is in the class The hole has a shape and has an enlarged portion corresponding to the abutting portion, the enlarged portion is recessed by the end surface, and the leakage preventing ring is installed in the enlarged portion and adjacent to the end surface.

The utility model has the advantages that the arrangement of the adjusting unit can maintain the airtightness between the guiding hole of the connecting rod and a pulling rod of a pull rod, so as to prevent vaporization before the low temperature fluid is not sent to the processing tool point, and Ensure low temperature cutting results.

100‧‧‧ spindle unit

231‧‧‧Reaming section

L‧‧‧ axis

232‧‧‧narrow hole section

110‧‧‧Spindle rod

30‧‧‧Adjustment unit

120‧‧‧ lever

31‧‧‧ Connecting rod

130‧‧‧ Pull rod head

311‧‧‧ Straight pipe section

140‧‧‧claw

311'‧‧‧ External thread

10‧‧‧Knife body

312‧‧‧Apartment

11‧‧‧Inside

313‧‧‧Inlet

12‧‧‧Outside

314‧‧‧ end face

13‧‧‧ 内孔

315‧‧‧Expanding Department

131‧‧‧Expanded section

32‧‧‧Adjustment rod

The first half of 131’‧‧

321‧‧‧Upper section

132‧‧‧Narrow path

322‧‧‧lower section

20‧‧‧ Pull bolt

323‧‧‧through hole

21‧‧‧ Positioning end

323’‧‧‧ Inside screw hole

22‧‧‧Link end

33‧‧‧Flexible parts

221‧‧‧Link head

34‧‧‧ leakproof ring

23‧‧‧Perforation

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic cross-sectional view of a conventional tool holder; FIG. 2 is a schematic view showing the mounting of a conventional tool holder and a processing machine spindle. Explain that a jaw has not yet clamped a pull bolt of the knife handle; 3 is a schematic view of a conventional tool holder clamping, illustrating the clamping jaw of the tool holder; FIG. 4 is a combined sectional view of an embodiment of the low temperature cutting blade of the present invention; FIG. 5 is a schematic view of the mounting of the embodiment. It is indicated that a jaw has not yet clamped a pull bolt of the knife handle; and FIG. 6 is a schematic view of the handle of the knife handle of the embodiment, illustrating that the jaw clamps the pull bolt of the knife handle.

Referring to FIG. 4 and FIG. 5, an embodiment of the low temperature cutting blade of the present invention is suitably mounted on a spindle unit 100. The spindle unit 100 has a spindle rod 110 extending along an axis L and having a hollow tubular shape. a pull rod 120 inside the main shaft 110, a pull rod head 130 connected to the pull rod 120, and a clamping jaw 140 coupled to the rod head 130, the rod 120 is movable relative to the main shaft 110 along the axis L, And by the change of the shape of the inner shaft 110, the jaw 140 can be loosened relative to the axis L (see FIG. 5) or the bundle clamp (see FIG. 6). It should be noted that the spindle unit 100 is not the focus of the present invention, and is prior art, so the detailed structure and operation are not explained, and FIG. 5 and FIG. 6 only show the partial structure. The low temperature cutting tool holder of the present invention comprises a tool holder body 10, a pull pin 20 and an adjustment unit 30.

The blade body 10 extends along the axis L and includes an inner end 11 , an outer end 12 opposite the inner end 11 along the axis L, and an extension along the axis L Extending and communicating from the inner end 11 to the inner bore 13 of the outer end 12. The inner hole 13 is in the shape of a class of holes, and has an enlarged diameter section 131 corresponding to the inner end 11 and a narrow diameter section that is coupled to the side of the enlarged diameter section 131 along the axis L and corresponds to the outer end 12 132. The enlarged diameter section 131 has an upper half 131' which is close to the inner end 11 and has an internally threaded hole shape. The tool holder body 10 of the present embodiment has the same shape as the existing tool holder body, the difference being that the enlarged diameter section 131 of the inner hole 13 has a greater depth than the existing tool holder body.

The pull bolt 20 extends along the axis L and is mounted on the inner end 11 of the handle body 10 and includes a positioning end adjacent to the inner end 11 and screwed into the upper half 131' of the enlarged diameter section 131. 21. A connecting end 22 along the axis L opposite to the positioning end 21, and a through hole 23 along the axis L and communicating from the connecting end 22 to the positioning end 21 and communicating with the inner hole 13 The end 22 has an enlarged connecting head 221 which is in the shape of a class of holes and has a reaming section 231 corresponding to the positioning end 21, and a reaming section 231 is connected to the joint head 221 Narrow hole section 232.

The adjusting unit 30 includes a connecting rod 31 that is disposed in the through hole 23 of the pull bolt 20, an adjusting rod 32 corresponding to the inner hole 13 and screwed to the connecting rod 31, and a connecting rod 31 is provided for maintaining An elastic member 33 projecting toward the outside of the connecting end 22 of the pull bolt 20, and a leakage preventing ring 34. The connecting rod 31 has a straight pipe section 311 slidably disposed in the narrow hole section 232, a disk-shaped abutting portion 312 connected to the straight pipe section 311, and a straight pipe section 311 extending therefrom. The abutting portion 312 is connected to the inner hole The guide hole 313 of the 13 has a male thread portion 311 ′ opposite to the abutting portion 312 . The abutting portion 312 is disposed outside the connecting end 22 of the pull bolt 20 and has an end surface 314 . The flow guiding hole 313 has a class hole shape and has an enlarged portion 315 corresponding to the abutting portion 312 recessed by the end surface 314. The adjusting rod 32 is mounted between the pull pin 20 and the handle body 10 and has a stepped rod shape, and has an upper rod section 321 extending in the reaming section 231 and a side connected to the upper rod section 321 And a lower rod section 322 installed in the enlarged diameter section 131, and a through hole 323 connecting the upper rod section 321 and the lower rod section 322 along the axis L, the lower rod section 322 is opposite to the upper rod section 321 The diameter of the lower rod section 322 is limited to the enlarged diameter section 131. The through hole 323 has an inner screw hole portion 323' which is screwed to the external thread portion 311'. The elastic member 33 is abutted between the handle body 10 and the adjusting rod 32 and is mounted on the enlarged diameter section 131 of the inner hole 13 . The leakage preventing ring 34 is mounted in the reaming portion 315 and adjacent to the end surface 314.

As shown in FIG. 4, when the whole of the knife handle is assembled, when the inner screw hole portion 323' of the adjusting rod 32 and the male screw portion 311' of the connecting rod 31 are screwed to each other, the lower rod portion 232 is enlarged. The lower rod section 322 is limited to the enlarged diameter section 131, and the upper rod section 321 of the adjusting rod 32 is slidably disposed along the axis L in the reaming section 231 of the through hole 23, and then The abutting portion 312 of the connecting rod 31 has an enlarged shape with respect to the straight pipe segment 311, so that the connecting rod 31 can also be restrained with respect to the pull bolt 20. In the normal state, by the elastic action of the elastic member 33, the lower rod segment 322 of the adjusting rod 32 is elastically abutted against the positioning end 21 of the pull bolt 20, and the connecting rod is made The abutting portion 312 of the recess 31 is embossed outside the connecting head 221 , and a distance is formed between the abutting portion 312 and the connecting head 221 . At this time, the leakage preventing ring 34 is not subjected to an external force (in a normal state), and the top edge protrudes from the end surface 314.

As shown in FIG. 5, when the pull rod 120 of the spindle unit 100 moves downward relative to the main shaft 110 along the axis L, and the jaw 140 is interlocked with respect to the axis L, the operation can be operated. The knife handle is inserted relative to the main shaft 110, and when the abutting portion 312 of the connecting rod 31 abuts against the bottom of the rod head 130, the top edge of the leakage preventing ring 34 also abuts against the bottom of the rod head 130. The spindle unit 100 produces an axial positioning.

As shown in FIG. 6, when the pull rod 120 of the spindle unit 100 is again moved in the opposite direction relative to the main shaft 110 along the axis L, and the jaw 140 is interlocked with the axis L, the clip is generated. The claw 140 is clamped to the joint head 221 of the pull bolt 20, and the cutter handle is axially positioned with respect to the spindle unit 100. At this time, the anti-leak ring 34 of the adjusting unit 30 is deformed by the bottom end of the pull rod head 130 to be deformed. And the airtightness between the tie rod head 130 and the abutting portion 312 of the connecting rod 31 is generated.

When the knife handle is applied to the machining operation of the industry or the aerospace industry with the existing spindle unit 100, and the high-speed, thin workpiece is required to be processed, the low-temperature fluid is directed toward the cutter body 10 along the spindle shaft 110 of the spindle unit 100. When the outer end 12 is transported and cooled toward the processing portion (as indicated by the arrow in FIG. 6), since the volume of the closed space in the system does not change, the volume of the flow path does not change, and the low-speed fluid There is no pressure drop in the middle of transportation, and the low-temperature fluid will not be vaporized in the middle of transportation due to the pressure drop, so that the low-temperature fluid can be kept at the expected low temperature when it reaches the processing tip, and the low-temperature cutting effect is good. It can avoid the phenomenon of fusion of the workpiece.

Therefore, the blade of the present invention can be applied to the processing requirements of the aerospace industry, and the phenomenon of fusion of the workpiece can be avoided. With the arrangement of the adjusting unit 30, the air guiding hole 313 of the connecting rod 31 and the rod head 130 can be kept airtight, which can prevent vaporization of the low temperature fluid before it is sent to the processing tool tip, which is more advantageous for high speed machining. Without the phenomenon of burning.

It should be noted that the blade body 10 of the present invention is different from the existing blade body only in that the depth of the enlarged diameter section 131 of the inner hole 13 is large. Therefore, the blade body 10 of the present invention can be performed by using an existing knife handle. Processing, without special design and production, can greatly reduce manufacturing costs.

In summary, the low-temperature cutting blade of the present invention has a simple overall structure and is easy to manufacture, and can indeed solve the technical problems caused by the application of the existing blade to the processing of the aerospace industry, and can truly achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

Claims (4)

A low temperature cutting tool holder comprising: a blade body extending along an axis and including an inner end, an outer end opposite the inner end along the axis, and an outer end extending along the axis and communicating from the inner end to the outer end An inner hole; a pull bolt extending along the axis and mounted to the inner end of the handle body, and including a positioning end adjacent to the inner end, a connecting end opposite the positioning end along the axis, and along the axis a through hole connected to the positioning end and communicating with the inner hole; and an adjusting unit comprising a connecting rod disposed in the through hole of the pull bolt, and a connecting rod is provided to keep the connecting rod An elastic member protruding from the outer end of the connecting end, and a leakage preventing ring having an abutting portion disposed outside the connecting end of the pulling bolt, and a guiding hole communicating with the inner hole, the abutting The portion has a disk shape and has an end surface perpendicular to the axis, the flow guiding hole has a class hole shape, and has an enlarged portion corresponding to the abutting portion, the enlarged portion is recessed by the end surface, the leakage preventing ring Installed in the expansion and O the end faces. The low temperature cutting tool holder according to claim 1 is suitable for being mounted on a spindle unit, the spindle unit having a pull rod and a jaw connected by the pull rod, the clamping jaw can be clamped at the joint end, and the cutter handle is Positioning is generated with respect to the spindle unit, and when the clamping jaw is clamped to the connecting end, the connecting rod is in airtight contact with the pulling rod. The low temperature cutting tool holder according to claim 2, wherein the adjusting unit further comprises an adjusting rod connected to the connecting rod and mounted between the pulling bolt and the handle body, the elastic member abutting the tool holder body and Between the adjustment rods. The low temperature cutting tool holder according to claim 3, wherein the inner hole of the tool holder body has a class hole shape, and has an enlarged diameter portion corresponding to the inner end and a side connected to the enlarged diameter portion along the axis and corresponding to The adjusting rod and the elastic member are mounted on the enlarged diameter section in the narrow diameter section of the outer end.