CN107570773B - Milling cutter - Google Patents
Milling cutter Download PDFInfo
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- CN107570773B CN107570773B CN201710957826.0A CN201710957826A CN107570773B CN 107570773 B CN107570773 B CN 107570773B CN 201710957826 A CN201710957826 A CN 201710957826A CN 107570773 B CN107570773 B CN 107570773B
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Abstract
The invention discloses a milling cutter, which comprises a cutter handle, a cutter body and a cutting blade, wherein one end of the cutter body is provided with a blade groove, the cutting blade is fixed in the blade groove through a fastening screw, the other end of the cutter body is a positioning end surface, the positioning end surface is sequentially provided with a threaded connecting hole and a positioning hole along the axial direction, the threaded connecting hole is communicated with the positioning hole, and the cutter handle is correspondingly provided with a threaded part matched with the threaded connecting hole and a positioning part matched with the positioning hole. The invention has the advantages of shortening the axial length of the cutter, improving the rigidity of the cutter and reducing the vibration of the cutter.
Description
Technical Field
The present invention relates to metal cutting tools, and more particularly to a milling tool.
Background
In metal cutting, the rigidity of the cutting tool is an important factor for ensuring the cutting quality, and the increase of the rigidity of the cutting tool is an effective way for prolonging the service life of the cutting tool. Especially for milling tools with not very large diameters (less than 80mm), the system rigidity has a significant influence on the machining quality. In the prior art, the diameter is at the milling cutter of 40mm to 80mm, and adopt the general cylinder locating hole of trade basically between the handle of a knife, the threaded connection mode, and rely on the key to transmit the moment of torsion, the cylinder locating hole on the handle of a knife and the hole clearance fit location on the cutting tool, the centre of rotation department of cutter adopts single screw and handle of a knife fastening (handle of a knife tip axial is equipped with the screw, the screw compresses tightly through gasket and cutter body), this type of connected mode exists not enoughly in the aspect of system rigidity, fastening screw's diameter receives the restriction of location cylinder locating hole diameter and generally can only select for use the screw thread model of minor. For example, when a cutting tool with the diameter of 63mm adopts a cylindrical positioning hole and a threaded connection structure, the fastening screw can only adopt the specification of M12 generally, and the threaded connection strength is greatly reduced. In addition, in order to provide sufficient space for accommodating the head of the fastening screw and the drive key groove in the body of the cutting tool, the axial direction of the cutting tool should be provided with a large length. Meanwhile, because the hole of the positioning cylindrical positioning hole is close to the cutter handle surface, namely, the hole is positioned at the other end, back to the cutting blade, of the cutter, the cutter is low in connecting strength and poor in rigidity, particularly in the milling process of large overhang and interrupted cutting, the actual cutting size of the cutter deviates from the non-cutting size, the cutting vibration is large, and the machining precision is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a milling cutter which can shorten the axial length of the cutter, improve the rigidity of the cutter and reduce the vibration of the cutter.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a milling cutter, includes handle of a knife, cutter body and cutting blade, cutter body one end is equipped with the blade groove, the cutting blade passes through fastening screw to be fixed in the blade groove, the cutter body other end is the location terminal surface, the location terminal surface is equipped with threaded connection hole and locating hole along the axial in proper order, threaded connection hole and locating hole intercommunication, the handle of a knife correspondence be equipped with threaded connection hole complex screw portion and with locating hole complex location portion.
As a further improvement of the above technical solution:
the axis of the knife handle, the axis of the knife body, the axis of the threaded connecting hole and the axis of the positioning hole are all on the same straight line.
The length a of threaded connection hole, the length b of locating hole satisfies: b-a is more than or equal to 2mm and less than or equal to 8 mm.
The axial length of cutter body is L, satisfies: a + b is more than or equal to 0.85L and less than L.
And one end of the positioning hole, which is connected with the threaded connecting hole, is provided with an oblique chamfer used for guiding the positioning part of the cutter handle.
The positioning hole is a cylindrical positioning hole.
The positioning hole is a conical positioning hole.
The positioning holes are through holes.
The positioning holes are blind holes.
The periphery of the cutter body is provided with a wrench groove.
Compared with the prior art, the invention has the advantages that:
(1) according to the milling cutter, the threaded connecting hole is close to the positioning end face, the positioning hole is close to one end of the cutting blade, the center positioning of the cutter body is realized through the positioning hole, the axial fastening of the cutter body is realized through the matching of the internal thread of the threaded connecting hole and the external thread on the cutter handle, the axial length of the cutter body only depends on the length of the threaded connecting hole and the positioning hole, the axial length of the cutter body is shortened to 60-75% of that of a common cutter, and the rigidity of the cutter is greatly improved; compared with the existing connection mode, the invention adopts a threaded connection mode, the strength of the invention does not depend on the shape limitation of the screw in the prior art, and the connection strength of the invention and the knife handle can be improved by 2 to 3 times compared with the common knife; in addition, the positioning hole determining the rigidity of the cutter body is arranged close to the cutting blade, when the cutter handle is used, the central guide matching area is basically flush with the cutting area of the cutting blade, namely the overhang of the cutting blade from a rigid cylindrical table (positioning part) of the cutter handle is basically zero, so that the cutter is designed to improve the rigidity of the cutting area to the maximum extent, effectively inhibit vibration (reduce the jumping amplitude of the cutting blade) and improve the surface processing quality.
(2) According to the milling cutter, the inclined chamfer used for guiding the positioning part of the cutter handle is arranged at one end, connected with the threaded connecting hole, of the positioning hole, the length a of the threaded connecting hole is smaller than the length b of the positioning hole, when the cutter body is installed on the cutter handle, the positioning part on the cutter handle is firstly contacted with the inclined chamfer on the positioning hole to generate a pre-centering effect, so that subsequent threaded matching can easily match an upper thread, the assembly is simple, the pre-positioning of a micro gap prevents the inclined thread from causing difficult screwing and thread breakage during threaded matching, the thread screwing efficiency is effectively improved, and the service life is prolonged.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a front view of a cutter body according to embodiment 1 of the present invention.
Fig. 3 is a schematic perspective view of a cutter body according to embodiment 1 of the present invention.
Fig. 4 is a front view of a cutter body according to embodiment 2 of the present invention.
Fig. 5 is a schematic perspective view of a cutter body according to embodiment 2 of the present invention.
The reference numerals in the figures denote:
1. a cutter body; 11. an insert pocket; 12. a wrench groove; 13. connecting a threaded hole; 14. positioning holes; 141. chamfering; 15. positioning the end face; 16. an internal cooling channel; 2. a cutting insert; 3. fastening screws; 4. a knife handle; 41. a threaded portion; 42. a positioning part.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
Example 1
As shown in fig. 1 to 3, the milling cutter of the present embodiment includes a cutter shank 4, a cutter body 1 and a cutting insert 2, wherein one end of the cutter body 1 is provided with an insert groove 11, the cutting insert 2 is fixed in the insert groove 11 by a fastening screw 3, the other end of the cutter body 1 is a positioning end surface 15, the positioning end surface 15 is provided with a threaded connection hole 13 and a positioning hole 14 in sequence along an axial direction, the threaded connection hole 13 is communicated with the positioning hole 14, and the cutter shank 4 is correspondingly provided with a threaded portion 41 engaged with the threaded connection hole 13 and a positioning portion 42 engaged with the.
In this embodiment, when the cutter body 1 is mounted and connected to the cutter handle 4, the positioning portion 42 of the cutter handle 4 is first matched with the positioning hole 14 for positioning, and then the threaded portion 41 of the cutter handle 4 is screwed into the threaded connection hole 13 to fasten the cutter body 1, the threaded connection hole 13 is close to the positioning end surface 15, and the positioning hole 14 is close to one end of the cutting insert 2. According to the milling cutter, the center positioning of the cutter body 1 is realized through the positioning hole 14 on the cutter body 1, the axial fastening of the cutter body 1 is realized through the matching of the internal thread of the threaded connecting hole 13 and the external thread on the cutter handle 4, the axial length of the cutter body 1 only depends on the lengths of the threaded connecting hole 13 and the positioning hole 14, the axial length of the cutter body 1 is shortened to 60-75% of that of a common cutter, and the rigidity of the cutter is greatly improved; compared with the existing connection mode, the invention adopts a threaded connection mode, the strength of the invention does not depend on the shape limitation of the screw in the prior art, and the connection strength of the invention and the knife handle 4 can be improved by 2 to 3 times compared with the common knife; in addition, the positioning hole 14 determining the rigidity of the cutter body 1 is arranged close to the cutting blade 2, when the cutter handle 4 is used, the central guide matching area can be ensured to be basically flush with the cutting area of the cutting blade 2, namely, the overhang of the cutting blade 2 from a rigid cylindrical table (positioning part 42) of the cutter handle 4 is basically zero, so that the cutter is designed to improve the rigidity of the cutting area to the maximum extent, effectively inhibit vibration (reduce the jumping amplitude of the cutting blade 2) and improve the surface processing quality.
In this embodiment, the axis of the tool shank 4, the axis of the tool body 1, the axis of the threaded connecting hole 13 and the axis of the positioning hole 14 are all on the same straight line. The thread tail part of the thread connecting hole 13 is provided with a tool withdrawal groove.
The length a of the threaded connecting hole 13 and the length b of the positioning hole 14 meet the following requirements: b-a is more than or equal to 2mm and less than or equal to 8mm, and in the embodiment, the following concrete steps are adopted: a =12mm, b =16 mm, a-b =4 mm. An inclined chamfer 141 for guiding the positioning portion 42 of the tool holder 4 is provided at one end of the positioning hole 14 connected to the screw connection hole 13. The length a of the threaded connecting hole 13 is smaller than the length b of the positioning hole 14, and the length of the external thread of the corresponding threaded part 41 on the tool shank 4 is also smaller than the length of the positioning shaft. Like this, when cutter body 1 was installed handle of a knife 4, location portion 42 on handle of a knife 4 at first contacted with the oblique chamfer 141 on the locating hole 14, produced the effect of pre-centering, and subsequent screw-thread fit is very easy to last profile of tooth like this, and the assembly is simple, and the pre-positioning in microgap prevents to take place the slope during screw-thread fit and causes the screw in difficulty, the screw thread bursts out and lacks, effectively improves screw thread screw in efficiency and life.
The axial length of cutter body 1 is L, satisfies: a + b is more than or equal to 0.85L and less than L. In this embodiment, the axial length L =30mm of the cutter body 1, but the ordinary cutter of the prior art adopts a type, B type interface in europe, and the axial length is at 40mm, and the axial length of the cutter body 1 of this embodiment shortens to 75% of the ordinary cutter, and the rigidity is very good. Specifically, a + b =0.93L, and the engagement position of the positioning hole 14 and the positioning portion 42 of the holder 4 is close to the end surface of the cutter body 1 on which the cutting insert 2 is mounted, which is effective against vibration. The length range of the bevel chamfer 141 is: 0.5 mm-5 mm, the range of the inclination angle is as follows: 10 to 80 degrees.
The cutting diameter of the cutter body 1 is D, the thread small diameter D1 of the thread connecting hole 13, the diameter D2 of the positioning hole 14 is D1 which is not less than 0.3D, D2 is not less than 0.7D, and D1-D2 which is not less than 0.05D1 is not less than 0.2D 1. In this example, D =63mm, D1=25.32mm, D2=22 mm, D1-D2=3.32 mm. The small diameter of the thread of the threaded connecting hole 13 reaches 25.32mm, while the small diameter of the connecting thread of the common cutter in the prior art is 10.5 mm, the diameter of the threaded connecting hole 13 is 2.4 times that of the common cutter, and the connecting strength is greatly improved. In this embodiment, the screw thread of the screw connection hole 13 is a multi-start screw thread.
In this embodiment, the cutter body 1 is provided with wrench grooves 12 at the periphery thereof, and the wrench grooves 12 are uniformly arranged at the periphery of the cutter body 1 by adopting four flat cutting grooves, so that the wrench can conveniently tighten the cutter body 1.
In this embodiment, the positioning hole 14 is a cylindrical positioning hole, and the positioning hole 14 is a through hole, i.e. an end portion extending to one end of the cutter body 1. Besides the present embodiment, the positioning hole 14 may be a conical positioning hole.
Example 2
As shown in fig. 4 and 5, the present embodiment is substantially the same as embodiment 1 except that:
in this embodiment, the positioning hole 14 is a blind hole. The wrench grooves 12 are uniformly arranged on the end surface of the cutter body 1 by adopting 5 waist-shaped holes.
In this embodiment, since the cutter body 1 is provided with the internal cooling channel 16, the positioning hole 14 is provided as a blind hole, i.e., the positioning hole 14 does not penetrate through the cutter body 1. The arrangement is beneficial to realizing the inner cooling of the cutter, thereby leading the inner cooling part to be less and having simple structure.
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 numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. 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 (7)
1. The utility model provides a milling cutter, includes handle of a knife (4), cutter body (1) and cutting insert (2), cutter body (1) one end is equipped with blade groove (11), cutting insert (2) are fixed in blade groove (11) through fastening screw (3), its characterized in that: cutter body (1) other end is location terminal surface (15), location terminal surface (15) are equipped with threaded connection hole (13) and locating hole (14) along the axial in proper order, threaded connection hole (13) and locating hole (14) intercommunication, handle of a knife (4) correspond be equipped with threaded connection hole (13) complex screw portion (41) and with locating hole (14) complex location portion (42), the length a of threaded connection hole (13), the length b of locating hole (14), satisfy: b-a is more than or equal to 2mm and less than or equal to 8mm, the length of the external thread of the threaded part (41) on the cutter handle (4) is less than that of the positioning part (42), and one end of the positioning hole (14) connected with the threaded connecting hole (13) is provided with an inclined chamfer (141) for guiding the positioning part (42) of the cutter handle (4); the cutting blade (2) and the fastening screw (3) are positioned on the circumferential surface of the cutter body (1), the projection of the circumferential cutting edge of the cutting blade (2) on the axis of the cutter body (1) is overlapped with the positioning part (42), the axial length of the cutter body (1) is L, and the requirements are met: a + b is more than or equal to 0.85L and less than L.
2. The milling tool of claim 1, wherein: the axis of the knife handle (4), the axis of the knife body (1), the axis of the threaded connecting hole (13) and the axis of the positioning hole (14) are all on the same straight line.
3. The milling tool according to claim 1 or 2, characterized in that: the positioning hole (14) is a cylindrical positioning hole.
4. The milling tool according to claim 1 or 2, characterized in that: the positioning hole (14) is a conical positioning hole.
5. The milling tool according to claim 1 or 2, characterized in that: the positioning holes (14) are through holes.
6. The milling tool according to claim 1 or 2, characterized in that: the positioning holes (14) are blind holes.
7. The milling tool according to claim 1 or 2, characterized in that: the periphery of the cutter body (1) is provided with a wrench groove (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710957826.0A CN107570773B (en) | 2017-10-16 | 2017-10-16 | Milling cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710957826.0A CN107570773B (en) | 2017-10-16 | 2017-10-16 | Milling cutter |
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| Publication Number | Publication Date |
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| CN107570773A CN107570773A (en) | 2018-01-12 |
| CN107570773B true CN107570773B (en) | 2020-02-18 |
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| CN201710957826.0A Active CN107570773B (en) | 2017-10-16 | 2017-10-16 | Milling cutter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449928A (en) * | 2018-11-09 | 2019-11-15 | 浙江欣兴工具有限公司 | A kind of unidirectionally rebound non-return type Quick Connect Kit and ready-package cutter |
| CN110883380B (en) * | 2019-11-28 | 2021-01-29 | 株洲钻石切削刀具股份有限公司 | Composite cutting tool |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1012345B (en) * | 1988-08-23 | 1991-04-17 | 李旭淮 | The slotting cutter of able to transpose position and to change series of bits |
| US8454277B2 (en) * | 2008-12-18 | 2013-06-04 | Kennametal Inc. | Toolholder and toolholder assembly with elongated seating pads |
| KR20130063189A (en) * | 2011-12-06 | 2013-06-14 | 대구텍 유한회사 | Head changeable cutting tool |
| CN102581367B (en) * | 2012-02-24 | 2013-11-20 | 株洲钻石切削刀具股份有限公司 | Milling tool with axial limiting device |
| CN204639280U (en) * | 2015-05-18 | 2015-09-16 | 东方电气集团东方汽轮机有限公司 | The compressing structure of shell end mill and shell end mill |
| CN106112085A (en) * | 2016-08-31 | 2016-11-16 | 锑玛（苏州）精密工具股份有限公司 | A kind of quick-changing type high accuracy cutter block and processing method thereof |
| CN206474728U (en) * | 2016-09-29 | 2017-09-08 | 成都曼德希科技有限公司 | A kind of milling cutter |
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