CN113245604B - Milling cutter and cutter bar thereof - Google Patents
Milling cutter and cutter bar thereof Download PDFInfo
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- CN113245604B CN113245604B CN202110496135.1A CN202110496135A CN113245604B CN 113245604 B CN113245604 B CN 113245604B CN 202110496135 A CN202110496135 A CN 202110496135A CN 113245604 B CN113245604 B CN 113245604B
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- milling cutter
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- 238000003801 milling Methods 0.000 title claims abstract description 76
- 230000009471 action Effects 0.000 claims abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 12
- 238000012545 processing Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 8
- 238000003825 pressing Methods 0.000 description 6
- 238000003754 machining Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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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
- B23C5/1009—Ball nose end mills
- B23C5/1027—Ball nose end mills with one or more 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
- B23C5/2204—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a milling cutter arbor, comprising: a jaw and a fastener; the clamping mouth comprises a blade accommodating cavity, a first clamping piece and a second clamping piece, wherein the blade accommodating cavity is clamped between the first clamping piece and the second clamping piece; the blade accommodating cavity comprises a bottom end; the first clamping piece is provided with a first fastening hole and a tapered hole gradually reduced towards the first fastening hole; the second clamping piece is provided with a second fastening hole; the first end of the fastener is expanded, the second end of the fastener is sequentially connected with the tapered hole, the first fastening hole, the blade accommodating cavity and the second fastening hole in series, and the fastener is bent towards the bottom end of the blade accommodating cavity under the action of the tapered hole; the axis of the conical hole is deviated towards the bottom end direction of the blade accommodating cavity relative to the axis of the fastener; in the radial direction of the milling cutter shank, the fastening member abuts against the side wall of the first fastening bore. A milling cutter using the cutter bar is also provided. The invention aims to provide a milling cutter and a cutter bar thereof, wherein the cutter bar has the advantages of greatly reduced blade vibration, firm installation, long service life of the cutter and good surface finish of a processed workpiece.
Description
Technical Field
The invention belongs to the field of cutting tools, and particularly relates to a milling cutter and a cutter bar thereof.
Background
The ball end mill with replaceable blade is used for processing curved surface, cavity and groove of workpiece, and the head of the cutter bar is provided with an elastic opening clamping mouth for the blade to be mounted and fastened on the cutter bar conveniently. The diameter of a round straight hole in an upper clamping nozzle sheet is about 0.4-0.6mm larger than that of a threaded hole in a lower clamping nozzle sheet in the existing ball-end milling cutter bar with replaceable blades at home and abroad. The purpose is to eliminate the manufacturing error of the cutter bar, the blade and the screw and reserve space for the bending deformation of the head of the screw. When in use, the round straight hole is not contacted with the polish rod at the middle part of the screw, and the disadvantages are that: when the cutting force is large, the blade can move in the direction of the cutter bar in the radial direction and perpendicular to the axis of the screw, namely the blade can vibrate and is installed insecurely, and the service life of the cutter and the surface finish of a machined workpiece are seriously influenced. And blade vibration is an important factor affecting tool life and surface finish of the machined workpiece.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a milling cutter and a tool holder thereof, in which vibration of an insert is greatly reduced, the mounting is firm, the life of the tool is long, and the surface finish of a machined workpiece is good.
This patent scheme provides a milling cutter arbor, includes: a jaw and fastener; the clamping nozzle comprises a blade accommodating cavity, a first clamping piece and a second clamping piece, and the blade accommodating cavity is clamped between the first clamping piece and the second clamping piece; the blade accommodating cavity comprises a bottom end; the first clamping piece is provided with a first fastening hole and a conical hole gradually reduced towards the first fastening hole; the second clamping piece is provided with a second fastening hole; the first end of the fastener is expanded, the second end of the fastener is sequentially connected with the tapered hole, the first fastening hole, the blade accommodating cavity and the second fastening hole in series, and the fastener is bent towards the bottom end of the blade accommodating cavity under the action of the tapered hole; the axis of the conical hole is offset towards the bottom end direction of the blade accommodating cavity relative to the axis of the fastener; in the radial direction of the milling cutter holder, the fastening member is in close proximity to the side wall of the first fastening bore.
Further, the radial cross-sectional shape of the first fastening hole is approximately elliptical and comprises two opposite semicircles and two parallel straight line segments; the two straight line segments are arranged between the two semicircles and respectively connected with two opposite ends of the two semicircles; or the radial cross-sectional shape of the first fastening hole is an ellipse.
Further, the radial cross-sectional shape of the tapered hole is circular or the same as the radial cross-sectional shape of the first fastening hole.
Further, the length direction of the first fastening hole is parallel to the axis of the milling cutter bar and is vertical to the width direction of the first fastening hole, and the length of the first fastening hole is 0.2-0.6mm larger than the width of the first fastening hole.
Further, the included angle of the taper hole is 35-65 degrees.
Furthermore, the axis of the conical hole is offset towards the bottom end direction of the blade accommodating cavity relative to the axis of the fastener, and the offset is 0.15-0.25mm.
Furthermore, the side surface of the fastener close to the second end of the fastener is provided with threads, and the other side surfaces are smooth; the second fastening hole is a threaded hole.
A milling cutter comprising an insert and a milling cutter bar according to any one of the above-mentioned technical solutions; the blade is provided with a mounting hole, the blade is inserted into the blade accommodating cavity of the milling cutter arbor, a fastening piece of the milling cutter arbor penetrates through the mounting hole, and the blade is mounted on the milling cutter arbor; the tolerance of the mounting hole is less than 0.015mm; the diameter of the middle part of the fastener is 0.005-0.015mm smaller than that of the mounting hole.
Furthermore, the tolerance of the thickness of the blade is less than or equal to 0.02mm.
The improvement of this patent brings the following advantage:
(1) The diameter of the first fastening hole of the milling cutter and the cutter bar thereof are very close to the diameter of the fastening piece. While ensuring smooth insertion of the fastener into the first fastener hole, the distance between the side wall of the first fastener hole and the side surface of the fastener is minimized, or both are in direct contact. In the prior art, the circular straight hole is not in contact with the screw, so that when the milling cutter is used for cutting, the circular straight hole cannot effectively limit the shaking or vibration of the screw in the radial direction of the cutter bar of the milling cutter, and further the vibration of the blade in the direction cannot be effectively inhibited (the screw is used for locking the fixed blade, and the vibration of the blade is transmitted to the screw). The embodiment of the application provides a milling cutter arbor, reduce milling cutter arbor as far as possible radially, the distance of fastener side and first fastening hole lateral wall. When the vibration of the cutting blade is transmitted to the fastening piece, when the fastening piece vibrates, the vibration or the deviation of the fastening piece in the direction can be greatly reduced by the side wall of the first fastening hole which is close to the side surface of the fastening piece in the radial direction of the milling cutter rod, thereby indirectly reducing the vibration or the shake of the cutting blade in the direction, prolonging the service life of the milling cutter, improving the processing precision of the milling cutter and improving the surface finish of a processed workpiece.
(2) Moreover, the fastener of this milling cutter arbor is under the effect of bell mouth to the bottom direction bending deformation in blade holding chamber (be to the bottom direction bending deformation of blade promptly) for the fastener compresses tightly the bottom of blade toward the holding chamber, lets the centre gripping of blade more firm, reduces by a wide margin in the processing probably appearing, along the axial vibrations or the shake of this milling cutter arbor, further prolongs the life of this milling cutter, improves the machining precision of this milling cutter and the smooth finish on processing workpiece surface.
(3) The cutter bar of the milling cutter greatly restrains the vibration of the blade in the axial direction and the radial direction of the cutter bar in the two mutually perpendicular directions, and the blade is firmly installed by forcefully clamping the blade by the first clamping piece and the second clamping piece.
(4) As further improvement, on the basis of the invention idea, the inventor obtains various design parameters matched with the invention idea through hundreds of tests and measurements, can reduce the vibration of the blade to the maximum extent, enables the clamping of the blade to be firm, prolongs the service life of the cutter, and simultaneously considers the advantages of practicability, low cost, convenience in installation and processing and the like. For example, the length of the first fastening hole is 0.2-0.6mm larger than the width, the width of the first fastening hole is 0.005-0.025mm larger than the diameter of the fastening member, and the taper angle of the tapered hole is 35-65 degrees, etc., which is a parameter that the inventor can exert the technical effects of the above (1) - (3) to the maximum extent and can carry out the installation simply and conveniently by taking the existing processing precision, processing difficulty, manufacturing cost, etc. of the parts into consideration and carrying out repeated tests for many times.
Drawings
Fig. 1 is a schematic cross-sectional view of a milling cutter arbor according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a schematic top view of a milling cutter arbor according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
fig. 5 is a schematic cross-sectional view of a milling cutter according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a milling cutter bar according to an embodiment of the present invention;
the clamping device comprises a clamping mouth 1, a fastening piece 2, a milling cutter tool bar axis 3, a blade 4, a blade accommodating cavity 11, a first clamping piece 12, a second clamping piece 13, a bottom end of the blade accommodating cavity 111, a first fastening hole 121, a tapered hole 122, a second fastening hole 131, a first fastening piece end 21, a second fastening piece end 22, a tapered hole axis 1221, a fastening piece axis 23, a first fastening hole length L, a first fastening hole width W, an offset E of the tapered hole axis relative to the fastening piece axis, and a tool bar 100.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In order to make the present application more comprehensible to those skilled in the art, a detailed explanation of the inventor's inventive idea will be given below.
As described in the background section above, the diameter of the circular straight hole in the upper nozzle piece in the prior art is about 0.4-0.6mm larger than the diameter of the threaded hole in the lower nozzle piece. The purpose is to eliminate the manufacturing error of the cutter bar, the blade and the screw and reserve space for the bending deformation of the head of the screw. When in use, the round straight hole is not contacted with the polish rod at the middle part of the screw. However, the inventor finds that in practical use, although the design can reduce vibration of a part of the blade, the effect is still not ideal, and the effect expected by the inventor cannot be achieved, namely, vibration and shaking of the blade in the machining process are greatly reduced, the machining precision is improved, the surface smoothness of a machined workpiece is improved, and the service life of the cutter is prolonged.
Therefore, after carrying out sufficient research and analysis on the existing milling cutter, the inventor finds that when the cutter bar of the existing milling cutter clamps the blade, although in the axial direction of the screw, a part of vibration components in the direction are limited due to clamping of the clamping mouth; and in the axial direction of the cutter bar, the cutter blade is pressed tightly due to the bending of the screw, and a part of vibration components in the axial direction of the cutter bar are limited. However, in the direction perpendicular to both the screw axial direction and the tool holder axial direction, the vibration component of the insert in this direction cannot be effectively limited because the diameter of the circular straight hole is not much larger than the diameter of the screw. However, for the convenience of installation and the need to reserve space for the bending deformation of the screw head, the diameter of the circular straight hole must be much larger than that of the screw.
In view of the above, after a plurality of failed attempts, the inventors selected and perfected the following schemes from a plurality of schemes: the clamping effect of the clamping mouth on the blade and the pressing effect of the bent screw on the blade are maintained, meanwhile, the vibration of the screw in the direction perpendicular to the axial direction of the screw and the axial direction of the cutter bar is limited as much as possible, the screw is enabled to be close to the side wall of the first fastening hole in the direction, and a reserved space for bending deformation of the head of the screw is reserved. The inventor has also carried out long-time test and experiment to the various parameters of this scheme, has both found out the vibrations that can furthest reduced the blade from it for the centre gripping of blade is firm, prolongs the life of cutter, compromises the parameter value scope of advantages such as practicality, low cost, easy to assemble processing simultaneously. The specific embodiments are described in the following examples.
As shown in fig. 1 to 6, embodiment 1 of the present application provides a milling cutter holder 100 including: a jaw 1 and a fastener 2;
the clamping mouth 1 is used for clamping objects as the name implies, and in the embodiment of the application, the clamping mouth 1 clamps a milling cutter blade 4 for cutting;
the clip 1 includes: a blade accommodating cavity 11, a first clamping piece 12 and a second clamping piece 13; the blade accommodating cavity 11 is clamped between the first clamping piece 12 and the second clamping piece 13;
the blade accommodating cavity 11 is positioned between the first clamping piece 12 and the second clamping piece 13, is clamped by the first clamping piece 12 and the second clamping piece 13, and is mainly used for accommodating the blade 4; the insert 4 is provided at the middle thereof with a mounting hole which is communicated in series with a first fastening hole 121 and a second fastening hole 131, which will be described later, when the insert 4 is placed in the insert receiving cavity 11, and the fastening member 2 is inserted into through holes formed by the three, thereby mounting the insert 4 to the holder 100;
the clamping mouth 1 is used for clamping the blade 4 by tensioning the first clamping piece 12 and the second clamping piece 13 in the vertical direction, the distance between the first clamping piece 12 and the second clamping piece 13 (namely the height of the blade accommodating cavity 11) is slightly larger than the thickness of the blade 4, and the precision is high; in addition, the precision of the thickness of the blade 4 is high, so that the blade 4 is firmly clamped by the first clamping piece 12 and the second clamping piece 13 of the clamping mouth 1 in the vertical direction and cannot move;
the tolerance of the height of the blade accommodating cavity 11 is preferably less than or equal to 0.02mm;
preferably, the tolerance of the thickness of the blade 4 is less than or equal to 0.02mm;
before the insert 4 is inserted into the holder 1 (i.e., before the insert-receiving cavity 11), the holder 1 needs to maintain a slightly opened state with respect to the insert 4 so as to smoothly insert the insert 4 (as shown in fig. 1); after the blade 4 is placed in the mouth 1 (i.e., after being inserted into the blade accommodating cavity 11) (as shown in fig. 5), a fastening force is required to be applied to draw the first clamping piece 12 and the second clamping piece 13 together towards the middle so as to clamp the blade 4 in the blade accommodating cavity 11, the fastening force can be applied by a fastening piece 2 penetrating through the first clamping piece 12 and the second clamping piece 13, and the fastening piece 2 can be a screw, a fastener and the like; when the blade 4 is unclamped and taken out of the clamping nozzle 1, the clamping nozzle 1 needs to be restored to the original state slightly opened relative to the blade 4 so as to facilitate the next clamping;
then, optionally, the clamp mouth 1 may adopt various different recovery modes such as an elastic recovery mode or a bolt recovery mode;
wherein the elastic recovery is an elastic clamping jaw 1, as shown in fig. 1 or 5, the elastic clamping jaw 1 is made of elastic material such as metal, alloy and the like as a whole; the elastic clamping nozzle 1 is formed by oppositely arranging a first clamping piece 12 and a second clamping piece 13 on a base body, wherein the first clamping piece 12, the second clamping piece 13 and the base body are integrally formed, one end of each of the first clamping piece 12 and the second clamping piece 13 is connected with the base body, and the other end of each of the first clamping piece 12 and the second clamping piece 13 is used for embedding and clamping the blade 4; the original state of the elastic clamping mouth 1 is a slightly opened state relative to the blade 4; when the blade 4 is clamped, the blade is closed towards the middle by the fastening action force of the fastening piece, and the first clamping piece 12 and the second clamping piece 13 of the elastic clamping mouth 1 are elastically deformed relative to the base body to generate an outward expanding elastic force; after the fastening member 2 is loosened, the first clamping piece 12 and the second clamping piece 13 are expanded outwards under the action of elastic force and return to the original state, namely a state slightly opened relative to the blade 4, so as to clamp the blade for the next time;
or a bolt recovery mode is adopted; with the adoption of the clamping mouth 1, one ends of the first clamping piece 12 and the second clamping piece 13 can adjust the distance between the first clamping piece 12 and the second clamping piece 13 by adjusting the depth of the bolt; the other end is used for placing and clamping the blade 4; in the original state of the clamping nozzle 1, the distance between the first clamping piece 12 and the second clamping piece 13 is relatively large, namely, the first clamping piece is slightly opened relative to the blade 4; when the blade 4 is clamped, the distance between the first clamping piece 12 and the second clamping piece 13 is reduced by adjusting the depth of the bolt, and the blade 4 is firmly clamped by matching with the fastener 2; when the blade 4 is taken out, the distance between the first clamping piece 12 and the second clamping piece 13 is further increased by adjusting the depth of the bolt, and meanwhile, the fastening piece 2 is loosened, so that the blade 4 is convenient to take out, and the clamping mouth 1 is restored to the original state;
a blade receiving cavity 11, the blade receiving cavity 11 including a bottom end 111; as described above, the blade housing chamber 11 is used to house and house the blade 4; the milling cutter also comprises a blade placing end which is positioned at the opening of the blade accommodating cavity 11, and the blade placing end and the bottom end 111 are positioned at two ends of the milling cutter bar axis 3 (hereinafter referred to as cutter bar axis 3);
the first clamping piece 12, the first clamping piece 12 is provided with a first fastening hole 121, and a tapered hole 122 which is gradually reduced towards the first fastening hole 121;
the first fastening hole 121 is arranged in the middle of the first clamping piece 12, is located between the tapered hole 122 and the blade accommodating cavity 11, and is respectively communicated with the tapered hole 122 and the blade accommodating cavity 11;
the axis of the first fastening hole 121 is perpendicular to the cutter arbor axis 3;
the axis of the first fastening hole 121 and the cutter arbor axis 3 are located in the same plane;
as shown in fig. 4, a length direction of a radial cross section of the first fastening hole 121 (i.e., a cross section in a radial direction of the first fastening hole 121) is the same as (parallel to) an axial direction of the milling cutter holder, and a width direction of the cross section is perpendicular to the length direction; the length of the section is slightly larger than the width, the section mainly has the main function of reserving an accommodating space for bending deformation of a fastener 2 towards the bottom end 111 of the blade accommodating cavity, and the bending deformation of the fastener 2 towards the bottom end 111 of the blade accommodating cavity has the function of enabling the middle part of the fastener 2 to press the blade 4 towards the bottom end 111 of the blade accommodating cavity, so that the blade 4 is clamped more firmly, the possible shake in the machining process along the axial direction of the milling cutter bar is prevented, and the machining precision and the finish of the blade 4 are improved;
the width of the cross section is very close to the diameter of the fastening piece 2 and is slightly larger than the diameter of the fastening piece 2, so that the fastening piece 2 can be smoothly inserted into the first fastening hole 121, meanwhile, the fastening piece 2 can be tightly attached to the side wall of the first fastening hole 121 to the maximum extent, and when the milling cutter is used, the shaking of the fastening piece 2 in the radial direction of a milling cutter tool holder can be limited to the maximum extent, further, the shaking and the vibration of the blade 4 fixed by the fastening piece 2 are reduced, and the processing precision and the finish degree of the blade 4 are improved;
preferably, the width of the first fastening hole 121 is 0.001-0.05mm greater than the fastener diameter in the radial direction of the milling cutter arbor; more preferably, the width of the first fastening hole 121 is 0.005-0.025mm larger than the diameter of the fastening member 2 in the radial direction of the milling cutter arbor;
alternatively, the radial cross-sectional shape of the first fastening hole 121 may be an ellipse; or the two semicircles are oppositely arranged, and the middle part is connected with the two opposite ends of the two semicircles through two parallel straight line segments to form a shape similar to an ellipse (as shown in figure 4);
preferably, the length L of the radial cross-section shape of the first fastening hole 121 is 0.2-0.6mm greater than the width W;
optionally, the width W of the first fastening hole 121 is the same as the diameter of the mounting hole of the blade 4, and the precision is the same;
optionally, the tolerance of the mounting hole of the blade 4 is less than 0.015mm;
the axis 1221 of the tapered bore is offset relative to the fastener axis 23 in the direction of the bottom end of the insert receiving pocket 11;
the tapered hole 122 is arranged in the middle of the first clamping piece 12, and the axis 1221 of the tapered hole is perpendicular to the axis 3 of the cutter arbor; the axis 1221 of the tapered bore is in the same plane as the cutter bar axis 3; the tapered hole 122 mainly functions to apply the acting force to the bending deformation of the enlarged end of the fastener 2 toward the bottom end 111 of the blade-receiving cavity, as described above; to achieve this, the tapered hole 122 tapers (i.e., is funnel-shaped) toward the first fastening hole 121, and the axis 1221 of the tapered hole is offset toward the bottom end of the insert receiving cavity 11 relative to the fastener axis 23; thus, when the fastening piece 2 is inserted into the tapered hole 122 and the first fastening hole 121 in sequence and continuously advances inwards, as the tapered hole 122 is continuously contracted towards the first fastening hole 121 and the axis 1221 of the tapered hole deviates towards the bottom 111 of the blade accommodating cavity, the expanded end (the first end 21) of the fastening piece first contacts with the side wall of the tapered hole 122 far away from the bottom 111 of the blade accommodating cavity, the side wall is continuously contracted inwards, and along with the increase of the depth of the fastening piece 2, the fastening piece 2 is slowly pressed to be bent and deformed towards the bottom 111 of the blade accommodating cavity, and the fastening piece 2 bent towards the bottom 111 of the blade accommodating cavity firmly presses the blade 4 connected in series on the fastening piece 2 towards the direction of the blade accommodating cavity 11, so that the vibration or shaking of the blade 4 is further limited, and the precision and the finish degree of the cutting blade 4 during processing are improved;
preferably, the axis 1221 of the tapered bore is offset relative to the fastener axis 23 in the direction of the bottom end 111 of the insert receiving pocket, and the offset E is 0.1-0.3mm; more preferably, the axis 1221 of the tapered bore is offset toward the bottom end 111 of the insert-receiving cavity relative to the fastener axis 23, the offset E being 0.15-0.25mm;
the included angle of taper of tapered bore 122 has a significant effect on the degree of fastener bending deflection, and preferably, the included angle of taper of tapered bore 122 is 35-65 °; the included angle of taper of tapered hole 122 refers to: the angle of the plane defined by the axis of the tapered bore 122 and the axis 3 of the cutter arbor, taken through the tapered bore 122;
optionally, the length direction of the radial section of the tapered hole 122 (i.e., the section along the radial direction of the tapered hole 122) is the same as the axial direction of the milling cutter holder, and the width direction of the section is perpendicular to the length direction; the length of the section is slightly larger than the width of the section, and the section is mainly used for reserving an accommodating space for bending and deforming an expanded end of a fastener 2 to be described later towards the bottom end 111 of the blade accommodating cavity;
alternatively, the radial cross-section of the tapered bore 122 may be elliptical; or the two semicircles are arranged oppositely, and the middle part is connected with the two opposite ends of the two semicircles through two parallel straight line segments to form a shape similar to an ellipse (as shown in figure 4;
alternatively, the tapered bore 122 preferably has a circular cross-sectional shape (i.e., the tapered bore 122 is conical), or the same cross-sectional shape as the fastener first end 21; because most fasteners prefer screws for fine depth adjustment, the heads of screws are generally round or otherwise shaped; the shape of the cross section of the tapered hole 122 is the same as that of the cross section of the first end 21 of the fastener, and the clamped fastener 2 is more matched and firmer with the tapered hole 122;
a second clip member 13, the second clip member 13 being provided with a second fastening hole 131;
the second fastening hole 131 is provided in the middle of the second clamp member 13, and the axis of the second fastening hole 131 is perpendicular to the knife bar axis 3; the axis of the second fastening hole 131 and the axis 3 of the cutter arbor are positioned on the same plane; the second fastening hole 131 functions mainly to fix the fastening member 2;
a fastener 2, the fastener first end 21 being enlarged; the second end 22 of the fastening member is inserted into the tapered hole 122, the first fastening hole 121, the blade accommodating cavity 11 and the second fastening hole 131 in sequence, and the fastening member 2 is bent towards the bottom end 111 of the blade accommodating cavity under the action of the tapered hole 122;
the fastener 2 is used for locking and fixing the blade 4 on the cutter bar 100 (namely on the clamping nozzle 1) and pressing the clamping nozzle 1; when the blade 4 is installed, the blade 4 is firstly placed into the blade accommodating cavity 11, and the installation hole of the blade 4 is communicated with the first fastening hole 121 and the second fastening hole 131 in series, so that the fastening piece 2 can be inserted and passed through; then the second end 22 of the fastener is inserted into the tapered hole 122, the first fastening hole 121, the mounting hole (the blade accommodating cavity 11) of the blade 4, and the second fastening hole 131 in sequence; then slowly pressing the clamping mouth 1 through the fastener 2 to enable the clamping mouth 1 to firmly clamp the blade 4, and further limiting the movement and shaking of the blade 4 through the fastener 2 through the blade 4 mounting hole in series connection; as the depth of the fastener 2 increases, the fastener 2 is bent towards the bottom end 111 of the blade accommodating cavity by the expanded end (the first end 21) of the fastener under the compression of the side wall of the tapered hole 122, so that the blade 4 is pressed towards the bottom end 111 of the blade accommodating cavity, the shaking and vibration of the blade 4 are further limited, and the cutting precision and the finish of the cutter are improved; the fastener 2 provides two forces, one is a clamping force to the clamping mouth 1, and the other is a pressing force for pressing the blade 4 towards the bottom end 111 of the blade containing cavity;
the fastening mode of the fastener 2 can be bolt (screw) fixing, buckle fixing or other fastening modes, as long as the functions of locking and fixing the blade 4 on the cutter bar and pressing the clamping nozzle 1 can be realized; in order to accurately adjust the depth of the fastening member 2, it is preferable to use a bolt for fixing, i.e. the side surface of the fastening member 2 near the second end 22 has a spiral thread, and the other side surfaces are smooth, and correspondingly, the second fastening holes 131 are threaded holes matched with the second fastening holes;
it should be noted that the first end 21 of the fastener is enlarged, which means that the first end 21 of the fastener protrudes from the side surface of the fastener, so as to cooperate with the tapered hole 122 to press the fastener 2 toward the blade-receiving cavity 11, so as to make it bend and deform; the fastener first end 21 is enlarged and is not limited in shape as long as this effect is achieved;
the middle part of the fastener 2 is a part opposite to the mounting hole of the blade 4, the surface of the middle part is smooth, the processing precision is high, the shape and the size are similar to the mounting hole of the blade 4, if the middle part is too small in size compared with the mounting hole of the blade 4, the blade 4 can move in the radial direction of the cutter bar and in the direction vertical to the axis of the fastener 2, namely, the blade 4 can vibrate and be installed insecurely, and the service life of a cutter and the surface finish of a processed workpiece are seriously influenced; if the shape and size are the same as the mounting hole of the blade 4, the fastener 2 is difficult to pass through the mounting hole of the blade 4 when the blade 4 is mounted; preferably, the diameter of the middle part of the fastener 2 is 0.005-0.015mm smaller than the mounting hole of the blade 4; more preferably, the diameter of the middle portion of the fastener 2 is 0.01mm smaller than the mounting hole of the blade 4.
As shown in fig. 1 to 4, a milling cutter bar 100 according to embodiment 2 of the present application includes a holder 1 and a screw 2;
the clamping mouth 1 comprises a first clamping piece 12, a blade accommodating cavity 11 and a second clamping piece 13 which are sequentially arranged from top to bottom;
the blade accommodating cavity 11 comprises a bottom end opposite to the opening of the clamping nozzle 1;
the middle part of the first clamping piece 12 is provided with a first fastening hole 121 with a smooth inner wall and a tapered hole 122 which is positioned above the first fastening hole 121 and communicated with the first fastening hole 121, and the tapered hole 122 is gradually reduced towards the first fastening hole 121;
the axis of the first fastening hole 121 is perpendicular to the cutter arbor axis 3; the axis of the first fastening hole 121 and the cutter arbor axis 3 are located in the same plane; as shown in fig. 4, the radial cross-sectional shape of the first fastening hole 121 is approximately elliptical, including two opposite semicircles and two parallel straight line segments; the two straight line sections are arranged between the two semicircles and respectively connected with two opposite ends of the two semicircles; accordingly, other non-approximately elliptical situations are excluded, such as two chordal semicircles being disposed opposite one another; the length direction of the cross section is the same as (parallel to) the axial direction of the milling cutter bar, and the width direction of the cross section is perpendicular to the length direction (i.e. perpendicular to the axial direction of the milling cutter bar, or parallel to the radial direction of the milling cutter bar); the length of the section is 0.2-0.6mm greater than the width; the width of the section is 0.005-0.025mm larger than the diameter of the screw;
the axis 1221 of the tapered bore is perpendicular to the cutter bar axis 3; the axis 1221 of the tapered bore is in the same plane as the cutter bar axis 3; the included angle of the taper of the tapered hole 122 is 35-65 degrees; as shown in fig. 4, the radial cross section of the tapered hole 122 (i.e., the cross section along the radial direction of the tapered hole 122) is circular, i.e., the tapered hole 122 is conical;
a second fastening hole 131 is formed in the middle of the second clamp member 13, and the second fastening hole 131 is a threaded hole; the axis of the second fastening hole 131 is perpendicular to the cutter bar axis 3; the axis of the second fastening hole 131 and the axis 3 of the cutter arbor are positioned on the same plane;
the head of the screw (i.e., the first end 21 of the fastener) is circular, the tail of the screw 2 (and the second end 22 of the fastener) is inserted into the tapered hole 122, the first fastening hole 121, the blade accommodating cavity 11 and the second fastening hole 131 in sequence, the head of the screw 2 causes the screw to bend towards the bottom end 111 of the blade accommodating cavity under the action of the tapered hole 122, and the middle and the side surfaces of the head of the screw 2 are smooth;
the axis 1221 of the tapered hole is offset towards the bottom end direction of the blade accommodating cavity 11 relative to the axis of the screw, and the offset E is 0.15-0.25mm; in the radial direction of the milling cutter bar, the screw abuts against the side wall of the first fastening hole 121.
The present embodiment 3 is substantially the same as the embodiment 2, except that the radial cross-sectional shapes of the first fastening hole 121 and the tapered hole 122 are both elliptical, the major axes of the two ellipses are both parallel to the tool shank axis 3, and the major axis is 0.2-0.6mm longer than the minor axis, and the minor axis is 0.005-0.025mm longer than the diameter of the screw.
As shown in fig. 5, embodiment 4 of the present application is a milling cutter including an insert 4 and a milling cutter holder 100 according to any one of embodiments 1 to 3; the middle part of the blade 4 is provided with a mounting hole, the blade 4 is inserted into the blade accommodating cavity 11 of the milling cutter arbor 100, the fastener 2 of the milling cutter arbor 100 penetrates through the mounting hole, and the blade 4 is mounted on the milling cutter arbor; the tolerance of the mounting hole is less than 0.015mm; the diameter of the middle part of the fastener 2 is 0.005-0.015mm smaller than that of the mounting hole; the width of the first fastening hole 121 of the milling cutter holder 100 is the same as the diameter of the mounting hole of the insert 4 with the same accuracy.
As shown in fig. 6, the milling cutter holder 100 is a ball end milling cutter holder 100 with replaceable inserts 4.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. A milling cutter bar, comprising: a jaw and fastener; the clamping nozzle comprises a blade accommodating cavity, a first clamping piece and a second clamping piece, and the blade accommodating cavity is clamped between the first clamping piece and the second clamping piece; the blade accommodating cavity comprises a bottom end; the first clamping piece is provided with a first fastening hole and a tapered hole gradually reduced towards the first fastening hole; the second clamping piece is provided with a second fastening hole; the first end of the fastening piece is expanded, the second end of the fastening piece is sequentially connected with the tapered hole, the first fastening hole, the blade accommodating cavity and the second fastening hole in series, and the fastening piece is bent towards the bottom end of the blade accommodating cavity under the action of the tapered hole; the axis of the conical hole is offset towards the bottom end direction of the blade accommodating cavity relative to the axis of the fastener; in the radial direction of the milling cutter tool bar, the fastening piece is tightly attached to the side wall of the first fastening hole; the radial cross section of the first fastening hole is approximately elliptical, and comprises two opposite semicircles and two parallel straight line sections, wherein the two straight line sections are arranged between the two semicircles and respectively connected with two opposite ends of the two semicircles; the length direction of the first fastening hole is parallel to the axis of the milling cutter bar and perpendicular to the width direction of the first fastening hole.
2. Milling cutter tool shank according to claim 1, in which the radial cross-sectional shape of the conical bore is circular or identical to the radial cross-sectional shape of the first fastening bore.
3. Milling cutter arbor according to claim 1, in which the length of the first fastening hole is 0.2-0.6mm greater than the width.
4. Milling cutter tool holder according to claim 1, characterized in that the width of the first fastening hole is 0.005-0.025mm larger than the diameter of the fastening member.
5. Milling cutter arbor according to claim 1, in which the included angle of taper of the conical bore is 35-65 °.
6. Milling cutter arbor according to claim 1, in which the axis of the conical bore is offset in the direction of the bottom end of the insert receiving cavity with respect to the axis of the fastening element by an amount of 0.15-0.25mm.
7. Milling cutter holder according to claim 1, characterized in that the fastening member is provided with a thread on the side near the second end, the remaining sides being smooth; the second fastening hole is a threaded hole.
8. A milling cutter tool, comprising an insert and a milling cutter holder according to any one of claims 1-7; the blade is provided with a mounting hole, the blade is inserted into the blade accommodating cavity of the milling cutter arbor, a fastening piece of the milling cutter arbor penetrates through the mounting hole, and the blade is mounted on the milling cutter arbor; the tolerance of the mounting hole is less than 0.015mm; the diameter of the middle part of the fastener is 0.005-0.015mm smaller than that of the mounting hole.
9. The milling cutter according to claim 8, wherein the tolerance of the thickness of the insert is ≦ 0.02mm.
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| CN202110496135.1A CN113245604B (en) | 2021-05-07 | 2021-05-07 | Milling cutter and cutter bar thereof |
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| CN202110496135.1A CN113245604B (en) | 2021-05-07 | 2021-05-07 | Milling cutter and cutter bar thereof |
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| JP2019141916A (en) * | 2018-02-15 | 2019-08-29 | 三菱日立ツール株式会社 | Square end mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3971522B2 (en) * | 1997-12-26 | 2007-09-05 | 日立ツール株式会社 | Throw-away cutting tool |
| CN201061833Y (en) * | 2006-11-24 | 2008-05-21 | 株洲钻石切削刀具股份有限公司 | Single slice finish-milling cutter |
| JP5309866B2 (en) * | 2008-10-10 | 2013-10-09 | 株式会社タンガロイ | Claw mechanism for throwaway rotary cutting tools and throwaway inserts |
| WO2017051714A1 (en) * | 2015-09-24 | 2017-03-30 | 三菱日立ツール株式会社 | Replaceable tool edge cutting tool |
| WO2017094531A1 (en) * | 2015-12-01 | 2017-06-08 | 三菱日立ツール株式会社 | Replaceable cutting edge cutting tool |
| KR102002756B1 (en) * | 2016-10-21 | 2019-07-23 | 미츠비시 히타치 쓰루 가부시키가이샤 | Cutting inserts and cutting blades |
| ES2810673T3 (en) * | 2016-12-23 | 2021-03-09 | Walter Ag | One ball nose end mill insert, one ball nose end mill tool body, and one ball nose end mill |
| CN107775019B (en) * | 2017-09-30 | 2020-04-28 | 株洲钻石切削刀具股份有限公司 | Polygonal cutting blade with boss in hole and cutting tool |
| CN111761111B (en) * | 2019-04-01 | 2023-03-21 | 京瓷株式会社 | End mill |
| CN110899800B (en) * | 2019-12-18 | 2021-03-23 | 株洲钻石切削刀具股份有限公司 | Single cutting blade replaceable type finish milling ball head cutter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2019141916A (en) * | 2018-02-15 | 2019-08-29 | 三菱日立ツール株式会社 | Square end mill |
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Application publication date: 20210813 Assignee: Shenzhen Zhangyuan Precision Tool Technology Co.,Ltd. Assignor: GANZHOU ACHTECK TOOL TECHNOLOGY Co.,Ltd. Contract record no.: X2023980053607 Denomination of invention: A milling cutter and its tool holder Granted publication date: 20221025 License type: Common License Record date: 20231222 |