Patent Application
20120235367
1. Field of the Invention
The present invention relates to a cutter-tooling assembly, and more particularly to a cutter-tooling assembly to prevent a relative rotation between a cutter and a tool holder.
2. Description of Related Art
A conventional cutter-tooling assembly has a tool holder, a cutter and a collet. The tool holder has a through hole axially formed through the tool holder. The cutter is inserted into the through hole. The collet is mounted in the through hole of the tool holder and is securely mounted around the cutter. Accordingly, the assembling of the tool holder and the cutter is completed and the conventional cutter-tooling assembly is ready for further operation.
However, the strength with which the collet clamps the cutter is insufficient and cross sectional shapes of the cutter and the through hole of the tool holder are round, so a relative rotation between the tool holder and the cutter may still occur and the conventional cutter-tooling assembly needs to be improved.
To overcome the shortcomings, the present invention tends to provide a cutter-tooling assembly to mitigate the aforementioned problems.
The main objective of the invention is to provide a cutter-tooling assembly to prevent a relative rotation between a cutter and a tool holder.
A cutter-tooling assembly has a tool holder, a positioning chunk, a cutter and a collet. The tool holder has a through hole axially formed through the tool holder. The positioning chunk is screwed in the through hole and has a cavity. The cavity has multiple corners formed around an inner surface of the cavity. The cutter is inserted into the through hole and has multiple edges abutting the corners. Because the cross sectional shape of the cavity is multilateral and has multiple corners which the edges abut, the combination of the corners and the edges can prevent a relative rotation between the tool holder and the cutter and make the cutter securely connected with the tool holder.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The cylindrical tool holder 10 has a main body 11 and a cap 12. The main body 11 has a connecting section 111, a collet section 112, a flange section 113, a through hole 114 and an abutting surface 115. The connecting section 111 is semi-conical. The collet section 112 is opposite to the connecting section 111. The flange section 113 is located between the connecting section 111 and the collet section 112.
The through hole 114 is axially formed through the connecting section 111, the flange section 113 and the collet section 112. Preferably, the through hole 114 has a first segment 1141 and a second segment 1142. The first segment 1141 is axially formed through the connecting section 111. The second segment 1142 is axially formed though the collet section 112 and has a diameter larger than that of the first segment 1141 and a bottom.
The abutting surface 115 is annular and is formed on the bottom of the second segment 1142 of the through hole 114.
The cap 12 is mounted on a distal end of the collet section 112.
The tool holder 10 except the through hole 114 may be conventional and detailed description is omitted.
The positioning chunk 20 is mounted securely in the through hole 114 of the tool holder 10, abuts the abutting surface 115 and has a first end, a second end, an external threaded part 21 and a cavity 22.
The second end of the positioning chunk 20 is opposite to the first end of the positioning chunk 20.
The external threaded part 21 is formed around the first end of the positioning chunk 20 and is screwed in the first segment 1141 of the through hole 114.
The cavity 22 is axially formed in the second end of the positioning chunk 20 and has a non-circular cross section, an inner surface and multiple corners 221. The corners 221 are formed around the inner surface of the cavity 22 at intervals.
Preferably, the positioning chunk 20 has a coolant hole 23 axially formed through the positioning chunk 20 and communicating with the cavity 22.
With reference to
The fixing area 32 is opposite to the cutting area 31 and has an outer surface and multiple edges 321. The edges 321 are formed on the outer surface of the fixing area 32 and abut the corners 221. Preferably, the fixing area 32 has a cross sectional shape the same as that of the cavity 22, and the edges 321 respectively abut the corners 221. The cross sectional shape of the fixing area 32 is rectangular and four edges 221 are correspondingly implemented.
The shank 33 is formed between the cutting area 31 and the fixing area 32.
Alternatively, the cross sectional shape of the fixing segment 1141 may be different from that of the fixing area 32. For example, the cross sectional shape of the fixing segment 1141 is hexagonal and the cross sectional shape of the fixing area 32 is triangular, as shown in
Preferably, the cutter 30 has a cutter aperture 34 formed through the cutter 30 and communicating with the cavity 22.
Accordingly, a coolant can flow through the coolant hole 23 and the cutter aperture 34 to cool the cutter 30 and a workpiece.
With reference to
With reference to
From the above description, it is noted that the present invention has the following advantages:
1. Prevention of a relative rotation between the tool holder 10 and the cutter 30, 30B, 30C:
The cross sectional shape of the cavity 22 of the positioning chunk 20 is multilateral and has multiple corners 221 which the edges 321, 321A of the cutter 30, 30B, 30C abut, so the combination of the corners 221 and the edges 321, 321A can prevent a relative rotation between the tool holder 10 and the cutter 30, 30B, 30C and make the cutter 30, 30B, 30C securely connected with the tool holder 10.
2. Good heat dissipating effect:
Because a coolant can flow through the coolant hole 23 and the cutter aperture 34,34B,34C, the heat of the cutter 30,30B,30C and the workpiece can be cooled, a heat dissipating effect is enhanced and the lifespan of the cutter-tooling assembly in accordance with the present invention is prolonged.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
