CN112974942A - Split type rotary cutter of U type tooth groove tapering path threaded connection - Google Patents
Split type rotary cutter of U type tooth groove tapering path threaded connection Download PDFInfo
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- CN112974942A CN112974942A CN202110151281.0A CN202110151281A CN112974942A CN 112974942 A CN112974942 A CN 112974942A CN 202110151281 A CN202110151281 A CN 202110151281A CN 112974942 A CN112974942 A CN 112974942A
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- thread
- external thread
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- teeth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/22—Securing arrangements for bits or teeth or cutting inserts
- B23C5/2295—Securing arrangements for bits or teeth or cutting inserts the cutting elements being clamped simultaneously
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a split type rotary cutter in U-shaped tooth groove taper small-diameter threaded connection, which comprises a cutter head component and a cutter bar component; the cutter head part is provided with an external thread connecting part; the cutter bar component is provided with an internal thread connecting part and matched with the external thread connecting part of the cutter head component; in the external thread connecting part of the cutter head part, the cross section of the thread teeth of the external thread is trapezoidal, the tooth form angle of the thread teeth is 5-30 degrees, the tooth root part of the thread teeth is provided with an R angle so that the tooth space between two adjacent thread teeth is U-shaped, the major diameter of the external thread is kept unchanged along the axis direction of the external thread connecting part, the minor diameter is in taper change, and the minor diameter is gradually reduced from inside to outside. The invention can enhance the strength of the tooth root and the bottom of the connection part of the split type rotary cutter, simultaneously lighten the stress concentration, increase the self-locking property of threaded connection, improve the condition that the connection part fails in advance due to deformation in the cutting process of the split type rotary cutter, ensure that the cutter can be processed more stably and improve the material utilization rate.
Description
Technical Field
The invention relates to the technical field of cutters, in particular to a split type rotary cutter with a U-shaped tooth groove taper small-diameter threaded connection.
Background
In order to improve the economy of the tool, the split type rotary tool is widely applied, and one main characteristic of the tool is that a cutter head part (a part containing a cutting edge) and a cutter bar part (a part containing a handle part) are independent, namely the cutter head part and the cutter bar part are two detachable independent parts, when the tool is used, the cutter head part and the cutter bar part are assembled together to form an integral rotary tool for cutting processing, after the cutting edge processing of the cutter head part reaches a rejection standard, the cutter head part (namely, the cutting edge) can be replaced, and the cutter bar part (namely, the handle part) can be repeatedly used, so that the cutter bar part can also be processed and manufactured by using a material with higher economy, thereby reducing unnecessary waste of the material, for example, the cutter head part containing the cutting part can be manufactured by using a hard alloy or a high-speed steel material, the cutter bar component can be made of economical materials such as alloy steel or hardened steel.
The head part (the part including the cutting edge) and the tool holder part (the part including the shank) of such a split-type rotary tool are usually connected by threads, for example, a straight thread structure is adopted, that is, an external thread of the straight thread structure is provided on the head part, and an internal thread of the straight thread structure of the tool holder part is screwed and matched with the internal thread of the tool holder part, so that the head part and the tool holder part are connected into a whole to realize cutting. However, in the connection mode of the straight thread structure in the prior art, stress concentration is easily generated at the bottom of the thread and the root of the thread tooth, so that the thread of the cutter head part is deformed, the cutter is scrapped in advance, and the service life of the split type rotary cutter is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the split type rotary cutter with the U-shaped tooth groove taper small-diameter threaded connection, the strength of the tooth root and the bottom of the joint of the split type rotary cutter can be enhanced through structural improvement, stress concentration is reduced, the self-locking property of threaded connection is improved, the condition that the joint fails in advance due to deformation of the joint in the cutting process of the split type rotary cutter is improved, the cutter can be processed more stably, and the material utilization rate is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a split type rotary cutter with U-shaped tooth groove taper small-diameter threaded connection comprises a cutter head component and a cutter bar component; one end of the cutter head component is provided with a cutting part, and the other end of the cutter head component is provided with an external thread connecting part; one end of the cutter bar component is provided with an internal thread connecting part and matched with the external thread connecting part of the cutter head component; in the external thread connecting part of the cutter head part, the cross section of the thread teeth of the external thread is trapezoidal, the tooth form angle of the thread teeth is 5-30 degrees, the tooth root part of the thread teeth is provided with an R angle so that the tooth space between two adjacent thread teeth is U-shaped, the major diameter of the external thread is kept unchanged along the axis direction of the external thread connecting part, and the minor diameter of the external thread is in taper change and gradually reduced from inside to outside.
The small diameter of the external thread is a taper diameter, the taper angle is a fixed value, and the value range of the taper angle is 1-10 degrees.
The tooth root parts of two sides of the thread tooth of the external thread are provided with R angles, and the radius value range of the R angles on the two sides is 1-5 mm.
And R angles of tooth roots on two sides of the thread teeth of the external thread are the same.
The crest width of the thread teeth of the external thread is kept constant along the axial direction of the external thread connecting part, and the thread form angle is kept constant.
The distance between the crests of the thread teeth of two adjacent external threads is kept constant along the axial direction of the external thread connecting portion.
In the internal thread connecting part of the cutter bar component, the tooth crest of the thread tooth of the internal thread is provided with an R angle, and the radius value range of the R angle is 1.5-5.5 mm.
The R angles of the tooth tops of the two sides of the thread teeth of the internal thread are the same, and the R angle of the tooth tops of the thread teeth of the internal thread is larger than the R angle of the tooth roots of the thread teeth of the external thread.
The major diameter of the internal thread is kept unchanged, the minor diameter of the internal thread is in taper change and gradually reduces from outside to inside, and the taper angle of the minor diameter of the internal thread is equal to the taper angle of the minor diameter of the external thread.
The crest width of the thread teeth of the internal thread is kept constant and is the same as the crest width of the thread teeth of the external thread along the axial direction of the internal thread connecting part, and the distance between the crests of two adjacent thread teeth of the internal thread is kept constant and is the same as the distance between the crests of two adjacent thread teeth of the external thread.
Compared with the prior art, the invention has the beneficial effects that:
in the external thread connecting part of the cutter head part, the section of the thread tooth of the external thread is in a trapezoidal shape, the tooth form angle of the thread tooth is 5-30 degrees, the tooth root part of the thread tooth is provided with an R angle so that the tooth space between two adjacent thread teeth is in a U shape, the large diameter of the external thread is kept unchanged along the axis direction of the external thread connecting part, and the small diameter of the external thread is in taper change and gradually reduces from inside to outside. The structure of the invention has the advantages that firstly, the cutting main body for realizing the cutting processing of the cutter can be replaced after reaching the cutting service life limit, and the clamping handle part can be repeatedly used; secondly, the accurate positioning of the cutter is realized; thirdly, the strength of the tooth root and the thread bottom of the external thread of the cutter is improved; fourthly, the self-locking performance of the threads is improved, and the connection stability of the cutter is ensured; fifthly, the tooth tip distance uniformity on the large-diameter cylindrical surface is realized through the variable lead design of the thread core part.
The invention is further explained in detail with the accompanying drawings and the embodiments; however, the split type rotary tool for the U-shaped tooth groove taper small-diameter threaded connection is not limited to the embodiment.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a head unit of an embodiment of the present invention;
FIG. 3 is a schematic structural view of an externally threaded coupling portion of a head member according to an embodiment of the present invention;
FIG. 4 is a schematic view of the external thread of the male threaded portion of the head member in accordance with an embodiment of the present invention;
FIG. 5 is a partial configuration view of the external thread of the externally threaded coupling portion of the head member in accordance with an embodiment of the present invention;
FIG. 6 is a perspective view of a cutter bar member of an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a tool holder component of an embodiment of the invention;
FIG. 8 is a cross-sectional view of a tool holder component of an embodiment of the invention;
FIG. 9 is a schematic view of the threaded engagement of the head member and the tool holder member of an embodiment of the present invention;
fig. 10 is an enlarged schematic view of a portion a in fig. 9.
In the figure: 1. a head part; 11. a cutting portion of the head member; 12. an external thread connecting portion of the head member; 13. a cutting edge of the cutting portion of the head member; 2. a cutter bar member; 21. an internal threaded connection of the cutter bar member; 3. an external thread; 31. thread teeth of the external thread; 32. tooth grooves between the thread teeth of the external thread; 4. an internal thread; 41. the thread teeth of the internal thread.
Detailed Description
Examples
Referring to fig. 1 to 10, the split type rotary tool with the U-shaped tooth groove taper small diameter threaded connection of the present invention includes a tool bit component 1 and a tool bar component 2; one end of the cutter head part 1 is provided with a cutting part 11, the other end is provided with an external thread connecting part 12, and an external thread 3 is arranged in the external thread connecting part 12; the cutting portion 11 is provided with a cutting edge 13, in this embodiment, the cutting edge 13 is integrally formed at one end of the head component 1, but the cutting edge 13 may also be provided in an insert, and then the insert is mounted at one end of the head component 1; one end of the cutter bar component 2 is provided with an internal thread connecting part 21 and matched with the external thread connecting part 12 of the cutter head component, and the internal thread connecting part 21 of the cutter bar component 2 is provided with an internal thread 4; in the external thread connecting part 12 of the cutter head part 1, the cross section of the thread tooth 31 of the external thread 3 is trapezoidal, and the tooth form angle gamma 1 of the thread tooth 31 is 5-30 degrees, so that the self-locking capability and the interchangeability of the thread can be ensured; the root of the thread tooth 31 has an angle R so that the tooth space 32 between two adjacent thread teeth is U-shaped, which can increase the strength of the thread root; along the axial direction of the external thread connecting part 12, the major diameter D1 of the external thread 3 is kept unchanged, and the minor diameter D1 of the external thread 3 is changed in a taper manner and gradually reduced from inside to outside (namely, gradually reduced from the position close to the cutting part 11 to the direction far away from the cutting part 11), so that stable processing is ensured, and the external thread can be smoothly matched with the internal thread; the major diameter D1 of the male thread 3 is the diameter of the profile of the crest of the thread tooth 31, and the minor diameter D1 of the male thread 3 is the diameter of the profile of the trough bottom of the tooth trough 32.
In this embodiment, the small diameter d1 of the external thread 3 is a taper diameter, the taper angle α is a fixed value, and the taper angle α ranges from 1 ° to 10 °. The root intensity of external screw thread 3 can not be guaranteed to angle alpha undersize to can not improve the condition of 3 stress concentration of external screw thread, the rationality of 3 root pitches of external screw thread is difficult to guarantee to angle alpha is too big, and the other local intensity of 3 path of external screw thread can descend, increases the deformation risk.
In this embodiment, the root portions of the two sides of the thread teeth 31 of the external thread 3 have R angles, and the radius R1 and R2 of the R angles at the two sides have a value range of 1-5 mm. The R angle can increase the combination tightness degree with the internal thread, and the self-locking property of the external thread connecting part 12 is increased; too small of the radii R1 and R2 can hardly ensure tight combination with the internal thread, and too large of the radii R1 and R2 can increase the difficulty of thread manufacture and reduce the matching degree with the internal thread.
In the present embodiment, the R angles of both side roots of the thread tooth 31 of the male thread 3 are the same, that is, the radius R1 of the R angle of one side root of the thread tooth 31 is equal to the radius R2 of the R angle of the other side root of the thread tooth 31.
In the present embodiment, the crest width L1 of the thread tooth 31 of the male thread 3 is kept constant along the axial direction of the male thread coupling portion 12, and the profile angle γ 1 is kept constant.
In the present embodiment, the distance P1 between the crests of the thread teeth 31 of two adjacent external threads 3 remains constant along the axial direction of the external thread connecting portion 12; the matching degree with the internal thread is ensured.
In the present embodiment, in the internal thread connecting portion 21 of the tool bar member 2, two sides of the crest of the thread tooth 41 of the internal thread 4 have R angles, and the radii R3 and R4 of the R angles at the two sides range from 1.5 mm to 5.5 mm. The R angle can be set to increase the tightness of the combination with the external thread.
In the present embodiment, the R angles of the thread crests on both sides of the thread tooth 41 of the female thread 4 are the same, that is, the radius R3 of the R angle of one tooth crest of the thread tooth 41 is equal to the radius R4 of the R angle of the other tooth crest of the thread tooth 41; and the radius of the R angle of the tooth crest of the thread tooth 41 of the internal thread 4 is larger than that of the R angle of the tooth root of the thread tooth 31 of the external thread 3, namely R1 < R3, R2 < R4, so that the tightness of the threaded connection is ensured.
In this embodiment, the major diameter D2 of the internal thread 4 is kept constant, the minor diameter D2 of the internal thread 4 is tapered and gradually decreases from outside to inside, and the taper angle β of the minor diameter D2 of the internal thread is equal to the taper angle α of the minor diameter D1 of the external thread 3, that is, the angle β ═ α is ensured to match the external thread. The major diameter D2 of the female thread 4 is the diameter of the profile of the bottom of the thread tooth 41, and the minor diameter D2 of the female thread 4 is the diameter of the profile of the top of the thread tooth 41.
In the present embodiment, the crest width L2 of the thread tooth 41 of the female thread 4 is constant and the same as the crest width L1 of the thread tooth 31 of the male thread 3 along the axial direction of the female thread connecting portion 21, that is, L2 is L1; the distance P2 between the crests of the thread teeth 41 of two adjacent internal threads 4 remains constant and is the same as the distance P1 between the crests of the thread teeth 31 of two adjacent external threads 3; the matching of the internal thread and the external thread is ensured.
The invention relates to a split type rotary cutter with a U-shaped tooth groove taper small-diameter threaded connection, which adopts the structure that in an external thread connecting part 12 of a cutter head part 1, the cross section of a thread tooth 31 of an external thread 3 is in a trapezoidal shape, the tooth form angle gamma 1 of the thread tooth 31 is 5-30 degrees, the tooth root part of the thread tooth 31 is provided with an R angle so that a tooth groove 32 between two adjacent thread teeth 31 is in a U shape, the large diameter D1 of the external thread 3 is kept unchanged along the axial direction of the external thread connecting part 12, and the small diameter D1 of the external thread 3 is in a taper change and is gradually reduced from inside to outside. The structure of the invention has the advantages that firstly, the cutting main body for realizing the cutting processing of the cutter can be replaced after reaching the cutting service life limit, and the clamping handle part can be repeatedly used; secondly, the accurate positioning of the cutter is realized; thirdly, the strength of the tooth root and the thread bottom of the external thread of the cutter is improved; fourthly, the self-locking performance of the threads is improved, and the connection stability of the cutter is ensured; fifthly, the tooth tip distance uniformity on the large-diameter cylindrical surface is realized through the variable lead design of the thread core part.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A split type rotary cutter with U-shaped tooth groove taper small-diameter threaded connection comprises a cutter head component and a cutter bar component; one end of the cutter head component is provided with a cutting part, and the other end of the cutter head component is provided with an external thread connecting part; one end of the cutter bar component is provided with an internal thread connecting part and matched with the external thread connecting part of the cutter head component; the method is characterized in that: in the external thread connecting part of the cutter head part, the cross section of the thread teeth of the external thread is trapezoidal, the tooth form angle of the thread teeth is 5-30 degrees, the tooth root part of the thread teeth is provided with an R angle so that the tooth space between two adjacent thread teeth is U-shaped, the major diameter of the external thread is kept unchanged along the axis direction of the external thread connecting part, and the minor diameter of the external thread is in taper change and gradually reduced from inside to outside.
2. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 1, characterized in that: the small diameter of the external thread is a taper diameter, the taper angle is a fixed value, and the value range of the taper angle is 1-10 degrees.
3. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 2, characterized in that: the tooth root parts of two sides of the thread tooth of the external thread are provided with R angles, and the radius value range of the R angles on the two sides is 1-5 mm.
4. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 3, characterized in that: and R angles of tooth roots on two sides of the thread teeth of the external thread are the same.
5. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 1, characterized in that: the crest width of the thread teeth of the external thread is kept constant along the axial direction of the external thread connecting part, and the thread form angle is kept constant.
6. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 5, characterized in that: the distance between the crests of the thread teeth of two adjacent external threads is kept constant along the axial direction of the external thread connecting portion.
7. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 3, characterized in that: in the internal thread connecting part of the cutter bar component, the tooth crest of the thread tooth of the internal thread is provided with an R angle, and the radius value range of the R angle is 1.5-5.5 mm.
8. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 7, characterized in that: the R angles of the tooth tops of the two sides of the thread teeth of the internal thread are the same, and the R angle of the tooth tops of the thread teeth of the internal thread is larger than the R angle of the tooth roots of the thread teeth of the external thread.
9. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 6, characterized in that: the major diameter of the internal thread is kept unchanged, the minor diameter of the internal thread is in taper change and gradually reduces from outside to inside, and the taper angle of the minor diameter of the internal thread is equal to the taper angle of the minor diameter of the external thread.
10. The split rotary tool for the U-shaped tooth groove taper small-diameter threaded connection according to claim 9, characterized in that: the crest width of the thread teeth of the internal thread is kept constant and is the same as the crest width of the thread teeth of the external thread along the axial direction of the internal thread connecting part, and the distance between the crests of two adjacent thread teeth of the internal thread is kept constant and is the same as the distance between the crests of two adjacent thread teeth of the external thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151281.0A CN112974942A (en) | 2021-02-03 | 2021-02-03 | Split type rotary cutter of U type tooth groove tapering path threaded connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151281.0A CN112974942A (en) | 2021-02-03 | 2021-02-03 | Split type rotary cutter of U type tooth groove tapering path threaded connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112974942A true CN112974942A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110151281.0A Pending CN112974942A (en) | 2021-02-03 | 2021-02-03 | Split type rotary cutter of U type tooth groove tapering path threaded connection |
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| CN (1) | CN112974942A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022102551A1 (en) | 2022-02-03 | 2023-08-03 | P&L Gmbh & Co. Kg | Arrangement for processing workpieces |
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| CN1375034A (en) * | 1999-08-10 | 2002-10-16 | 亨廷油田服务公司 | Threaded pipe connection |
| CN203230349U (en) * | 2013-03-06 | 2013-10-09 | 中国石油天然气股份有限公司 | Drilling tool thread structure for increasing area of thread bearing surface |
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| DE102015010399A1 (en) * | 2015-08-11 | 2017-03-02 | Iscar Ltd. | Exchangeable cutting head having a threaded attachment portion with two spaced conical abutment surfaces provided with the same cone angle, tool holder and rotating cutting tool |
| CN109434143A (en) * | 2018-09-26 | 2019-03-08 | 厦门金鹭特种合金有限公司 | Head exchange type cutting tool |
| CN110385471A (en) * | 2018-04-19 | 2019-10-29 | 苏州钰创工业新材料有限公司 | A kind of head-exchangeable solid milling cutter |
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2021
- 2021-02-03 CN CN202110151281.0A patent/CN112974942A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| CN1375034A (en) * | 1999-08-10 | 2002-10-16 | 亨廷油田服务公司 | Threaded pipe connection |
| CN203230349U (en) * | 2013-03-06 | 2013-10-09 | 中国石油天然气股份有限公司 | Drilling tool thread structure for increasing area of thread bearing surface |
| CN106457424A (en) * | 2014-05-05 | 2017-02-22 | 肯纳金属公司 | Cutter heads with improved coupling |
| CN106346029A (en) * | 2015-07-13 | 2017-01-25 | 张新添 | Thread structure for connecting cutters |
| DE102015010399A1 (en) * | 2015-08-11 | 2017-03-02 | Iscar Ltd. | Exchangeable cutting head having a threaded attachment portion with two spaced conical abutment surfaces provided with the same cone angle, tool holder and rotating cutting tool |
| CN110385471A (en) * | 2018-04-19 | 2019-10-29 | 苏州钰创工业新材料有限公司 | A kind of head-exchangeable solid milling cutter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022102551A1 (en) | 2022-02-03 | 2023-08-03 | P&L Gmbh & Co. Kg | Arrangement for processing workpieces |
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Application publication date: 20210618 |