CN212823865U

CN212823865U - A drill-and-insert milling cutter

Info

Publication number: CN212823865U
Application number: CN202021141977.2U
Authority: CN
Inventors: 张剑; 欧阳陵江; 戴俊豪
Original assignee: HUNAN RADIO AND TV UNIVERSITY (HUNAN NETWORK ENGINEERING VOCATIONAL COLLEGE)
Current assignee: HUNAN RADIO AND TV UNIVERSITY (HUNAN NETWORK ENGINEERING VOCATIONAL COLLEGE)
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-03-30
Anticipated expiration: 2030-06-18

Abstract

The utility model discloses a drill-insertion type milling cutter. The drill-insertion type milling cutter comprises a cutter handle and a cutter head connected to the end of the cutter handle. A pair of blades is installed on the end of the cutter head away from the cutter handle. For the cutting edge for cutting the workpiece, a pair of inserts are symmetrical along the center of the cutter head, and the cutting edges of the pair of inserts are respectively formed as inner and outer edges. The drill and plunge milling cutter disclosed by the utility model forms an inner edge and an outer edge by setting the cutting edges of a pair of blades symmetrically along the center of the cutter head, so that the inner edge and the outer edge are alternately arranged. Or during drilling, a pair of inserts are used to process the workpiece, the inner and outer edges are matched to expand the cutting area, four cutting parts are formed during drilling, and two cutting areas are formed during plunging, with simultaneous drilling and cutting. The function of ploughing can effectively reduce the machining process of parts, improve the machining efficiency, and ensure the accuracy of machining parts and tool safety.

Description

Drilling and inserting type milling cutter

Technical Field

The utility model relates to a machine tool machining cutter technical field especially relates to a bore formula milling cutter of inserting.

Background

A milling cutter is a rotating tool with one or more cutter teeth for milling. When in work, each cutter tooth cuts off the allowance of the workpiece in sequence and intermittently. The milling cutter is mainly used for processing planes, steps, grooves, forming surfaces, cutting workpieces and the like on a numerical control milling machine.

In the related technology, when a mold with a deep cavity and a complex profile is machined in a numerical control manner, a large number of machining tools are needed, machining processes and programming are complex, and machining modes generally used in factory machining are that firstly, a tool pre-drilling hole is drilled, and then, a slotting cutter is used for slotting the cavity. The reason for processing is that the position of a blade of the milling cutter is limited, and the blade cannot exceed the area where the cutter teeth are located in the process of selecting the processing step, so that the milling cutter is not suitable for drilling, the milling cutter needs to be matched with the milling cutter when a deep cavity complex profile mold is processed, after pre-drilling, the cavity is cut by controlling the cutting step, the process is complicated, the difficulty of part processing is increased, and the time and the process for processing the parts are greatly increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, an embodiment of the utility model provides a it is expected to provide a drilling insert type milling cutter of compatible drilling, slotting function in order to reduce manufacturing procedure, improve machining efficiency simultaneously.

The technical scheme of the utility model is realized like this:

the utility model provides a bore formula of inserting milling cutter, includes the handle of a knife and connect in the tool bit of handle of a knife tip, the tool bit is kept away from the one end of handle of a knife is installed a pair of blade, is formed with the cutting edge that is used for cutting work piece on each blade, and is a pair of the cutting edge of blade forms interior sword and outer sword respectively.

Preferably, the tool bit is provided with two chip grooves and mounting grooves for assembling the blade, and the mounting grooves are formed by inwards recessing one side wall of each chip groove.

Preferably, the opening shape of the mounting groove is matched with the external structure of the blade.

Preferably, an included angle between two side walls of the chip groove is larger than 90 degrees and smaller than 180 degrees.

Preferably, the main deflection angle and the auxiliary deflection angle of the cutting edge are equal in angle, and both angles are 89 °.

Preferably, the length ratio of the side lengths of the inner edge to the outer edge is 0.75: 0.51.

Preferably, the side edge of each blade has an off-angle of 6 to 10 °.

Preferably, the blade is connected with the cutter head through a screw.

Preferably, the tool bit is in a circular truncated cone shape, and the edges of the outer contour of the tool bit are all formed with chamfers.

Preferably, the cutting head and the shank are integrally formed.

The embodiment of the utility model provides a bore formula milling cutter of inserting is a pair of through setting up the cutting edge of blade forms interior sword and outer sword, makes interior sword, outer sword form and set up in turn, like this, when carrying out slotting or drilling with man-hour, process the work piece with a pair of blade, interior sword with the cooperation of outer sword enlarges cutting area, forms four cutting parts when the drilling, forms two cutting area during the slotting, possesses the function of drilling simultaneously and slotting, has realized the simultaneous processing of drilling and bolt to reduce the parts machining process effectively, improved machining efficiency, guaranteed processing part precision and cutter safety.

Drawings

Fig. 1 is a perspective view of a drilling and milling cutter according to the present invention;

FIG. 2 is a schematic view of the pair of blades shown in FIG. 1;

FIG. 3 is a perspective view of the drill-insert milling cutter shown in FIG. 1;

FIG. 4 is a principal rake angle of the insert shown in FIG. 1;

FIG. 5 is a minor rake angle of the insert shown in FIG. 1;

fig. 6 is a plan view of the cutter head shown in fig. 1.

Detailed Description

In order to illustrate embodiments of the present invention or technical solutions in the prior art more clearly, the following description will be made in conjunction with the accompanying drawings in embodiments of the present invention to describe the technical solutions in the embodiments of the present invention clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a perspective view of a drilling and inserting type milling cutter according to the present invention; fig. 2 is a schematic view of the pair of blades shown in fig. 1. The drilling and inserting type milling cutter comprises a cutter handle 1 and a cutter head 3 connected to the end part of the cutter handle 1, wherein one end of the cutter head 3, which is far away from the cutter handle 1, is provided with a pair of blades 5, each blade 5 is provided with a cutting edge for cutting a workpiece, the cutting edges of the pair of blades 5 are respectively formed into an inner edge 7 and an outer edge 9, the inner edges 7 and the outer edges 9 formed by a pair of the blades 5 are arranged alternately to form the inner edges 7 and the outer edges 9, in the case of performing a slotting or drilling work, a work is machined by the pair of inserts 5, the inner edge 7 and the outer edge 9 cooperate to enlarge a cutting area, four cutting parts are formed during drilling, two cutting areas are formed during slotting, the functions of simultaneous drilling and slotting are achieved, the part machining procedures are effectively reduced, the machining efficiency is improved, and the part machining precision and the cutter safety are guaranteed. It is necessary to provide, especially when machining deep cavity complex profile dies, the middle thin wall is easy to deform in radial machining due to the certain axial cutting depth of the dies, and the drill insert type milling cutter can be directly fed from the middle, so that the working procedure and the machining time can be shortened, and the cutting advantages are more prominent.

Fig. 3 is a perspective view of the drill milling cutter shown in fig. 1. Two chip grooves 31 and mounting grooves 33 used for assembling the blade 5 are formed in the tool bit 3, and the mounting grooves 33 are formed by inwards recessing one side wall of the chip grooves 31 respectively. The number of the chip grooves 31 is not excessive, and in the present embodiment, two chip grooves 31 are provided, which is to ensure the rigidity of the cutter head 3.

The installation groove 33 is formed in a shape matched with the external structure of the blade 5 so as to facilitate better installation of the blade 5 and improve installation adaptability.

It should be noted that, the formation of the chip discharge groove 31 avoids the phenomenon of sticking a cutter, and improves the processing precision and the processing speed. In order to improve the manufacturability of the milling cutter, the included angle between the two side walls of the chip groove 31 is larger than 90 degrees and smaller than 180 degrees. Preferably, in the present embodiment, an included angle between two side walls of the chip groove 31 is 100 °.

Referring to fig. 4 and 5, fig. 4 is a principal deflection angle of the insert shown in fig. 1; FIG. 5 is a minor rake angle of the insert shown in FIG. 1; the cutting edge of each insert 5 has a major cutting edge angle a equal to a minor cutting edge angle B, which is 89 °. Because the cutting edge of the drilling and milling type milling cutter can generate axial component force and radial component force under the cutting action, the stress in the y horizontal direction is larger, but because the drilling and milling type milling cutter mainly adopts axial feeding, the radial force of the main shaft is small, in order to ensure that the drilling and milling type milling cutter cuts into a workpiece at an optimal angle and reduce the contact length between the cutting edge and the workpiece, the angle of the main deflection angle A is preferably set to be 89 degrees. This shows that in the plastic range, the cutting force along the circumferential direction, under the state of good symmetry of the cutter, the radial component forces during plane drilling and slotting are mutually offset to zero, and once the cutter is in full contact with a workpiece, the acting force is smaller and smaller, so that the cutter can not generate deviation and vibration, thereby solving the problem of uneven stress of the milling cutter in the process of bolt machining.

Fig. 6 is a plan view of the cutter head shown in fig. 1. In order to prevent the side edge of the cutter from cutting and prevent the cutter from breaking, according to the fact that the included angle of the cutter blade 5 is 90 degrees, a secondary deflection angle B with the same angle is selected according to the set size of the primary deflection angle A, and the angle value of the secondary deflection angle B is 89 degrees. Further, the angles of the axial positive rake angle and the radial negative rake angle C are both taken to be +3 °.

Specifically, in the present embodiment, the length ratio of the side lengths of the inner blade 7 and the outer blade 9 is 0.75: 0.51. The side length ratio of the inner edge 7 to the outer edge 9 of the drilling and inserting type milling cutter is controlled to be 0.75:0.51, the structural arrangement is most reasonable, the size of the maximum cutting step distance can be favorably adjusted, the stress of the blade 5 is more reasonable, the maximization of the cutting step distance is realized, and the problem that the drilling and inserting type milling cutter is stressed unevenly in the slotting machining process is solved.

In contrast, when the U drill is used for slotting, the cutter is subjected to cutting force during cutting, the friction force between the periphery of the cutter and an inner hole and the friction force caused during cutting removal, and the U drill has a tendency of deviating from an ideal position under the combined action of axial force and radial force in the slotting and milling process, so that the U drill cannot be used for slotting and milling process, the stress of a blade is uneven during the U drill processing, the blade for cutting a workpiece is further abraded quickly, the machine tool is vibrated greatly, and the service life of the cutter is influenced.

As shown in fig. 6, in the present embodiment, the offset angle D of the side edge of each insert 5 is 6 to 10 °, and preferably, the offset angle D of the side edge of each insert 5 is 8 °, so that the lateral cutting force can be reduced, the tool can be protected, and the slotting precision can be improved. This is because, when the drilling and slotting cutter is used for drilling or slotting, it is necessary to avoid large-scale lateral cutting, so that the drilling and slotting cutter can be prevented from being worn in the slotting process to affect the machining precision. However, due to the complexity of the machining process, the side edge of the insert may contact the workpiece due to damage to the tool caused by the combined effect of the cutting force on the pressing of the tool, and therefore, the lateral cutting capability of the insert-type drill cutter needs to be considered.

Specifically, in this embodiment, the blade 5 and the cutter head 3 are detachably connected through a screw, so that the blade 5 can be replaced conveniently.

The larger the thickness of blade 5 is, the better its intensity is, and the cutting load that can bear is also bigger, the cutting edge of blade 5 need not the overlength, the maximum cutting diameter of tool bit 3 is 20mm, the width 6mm of blade 5, and thickness sets up to 2.38mm, and the relief angle sets up to 11.

Specifically, in this embodiment, the cutting head 3 is a truncated cone, the taper is 10 °, and the design of the truncated cone of the cutting head 3 enhances the rigidity of the cutter. The edges of the outer contour of the cutting head 3 are chamfered. The edge part of the sharp outer contour is rounded, so that the stress concentration during processing is avoided, and the machining process is met.

Specifically, in this embodiment, the handle 1 is a cylinder, the diameter of the handle 1 is 10mm, and the total length of the tool bit 3 and the handle 1 is 80 mm. Wherein, the tool bit 3 and the tool handle 1 are formed by integral casting.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a bore formula milling cutter of inserting which characterized in that, including the handle of a knife and connect in the tool bit of handle of a knife tip, the tool bit is kept away from a pair of blade is installed to the one end of handle of a knife, is formed with the cutting edge that is used for cutting work piece on each blade, and is a pair of the blade the cutting edge forms interior sword and outer sword respectively, the angle of the main declination of cutting edge equals with vice declination.

2. The drill-insert milling cutter according to claim 1, wherein the cutting head defines two flutes and mounting grooves for mounting the inserts, the two mounting grooves being formed by recessing inward from a side wall of each flute.

3. The drill-insert milling cutter according to claim 2, characterized in that the opening of the mounting groove is shaped to match the outer configuration of the insert.

4. The drill-insert milling cutter according to claim 2, characterized in that the angle between the two side walls of the chip flute is greater than 90 ° and less than 180 °.

5. The drill-insert milling cutter according to claim 1, wherein the cutting edges have a major and minor cutting edge angle of 89 °.

6. The drill-mill according to claim 1, characterized in that the length ratio of the side lengths of the inner edge to the outer edge is 0.75: 0.51.

7. The drill-insert milling cutter according to claim 1, wherein the side edges of the inserts are angled at 6 to 10 °.

8. The drill-insert milling cutter according to claim 1, wherein the insert and the cutter head are connected by screws.

9. The drill-insert milling cutter according to claim 1, wherein the cutting insert is of a truncated cone shape, the edges of the outer contour of the cutting insert being chamfered.

10. The drill-insert milling cutter according to claim 1, wherein the cutting head and the shank are integrally formed.