CN110449668A - A kind of high-efficient gear milling cutter - Google Patents

Abstract

The invention discloses a high-efficiency gear milling cutter. The first edge face, the second edge face, the third edge face, and the fourth edge face are connected; the chip pit is recessed on the surface of the cutter head and connected with the fourth edge face; each cutter head has two cutting edge groups, The two chip pockets are projected along the axial viewing angle of the cutter head. The respective contours of the cutting edge group and the chip pits are center-symmetrical. Along the viewing angle perpendicular to the axis of the cutter head, there are respective contours of the first edge face and the chip pits. The edge of the cutter head is axisymmetric along the axis of the cutter head itself. With this invention, the gap between adjacent teeth can be processed in one process, and several connected blade surfaces change sequentially. The cutting amount of each blade surface is low, and the head and tail motion tracks of the cutter head can overlap, ensuring the operation of the cutter. time stability.

Description

A high-efficiency gear milling cutter

technical field

The invention relates to the field of machine tool cutters, in particular to a high-efficiency gear milling cutter.

Background technique

The prior art cannot achieve high-efficiency gear machining. High-speed, high-efficiency milling ensures product accuracy and tool life. At the same time, high-strength, high-precision gear cutters are required, as well as slow-feed processing. And when milling gears, it is easy to produce serious tool vibration, long processing cycle, low pass rate of finished products, and easy scrapping of processed parts. Low production efficiency and poor quality. Therefore, it is necessary to develop a high-precision, high-speed, high-efficiency, high-rigidity gear machining milling cutter

Contents of the invention

The problem to be solved by the present invention is to provide a high-efficiency gear milling cutter, which can process the gaps between adjacent teeth at one time, and several connected blade surfaces change sequentially, and the cutting amount of each blade surface is low, and The trajectory of the head and tail can be overlapped to ensure the stability of the tool during operation.

In order to solve the above problems, the present invention provides a high-efficiency gear milling cutter. In order to achieve the above object, the technical solution adopted by the present invention to solve the technical problems is:

A high-efficiency gear milling cutter, comprising: a tool holder; a cutter head, which is integrally fixed coaxially with one shaft end of the tool holder; and a cutting edge group, along the opposite direction of rotation of the cutter head, each cutting edge group includes sequentially connected first The first edge surface, the second edge surface, the third edge surface, and the fourth edge surface; the chip pit is recessed on the surface of the cutter head and connected with the fourth edge surface; each cutter head has two cutting edge groups, two Chip pit, projected along the axial view angle of the cutter head, the contours of the cutting edge group and the chip pit are centrally symmetrical, and along the viewing angle perpendicular to the axis of the cutter head, there are edge edges of the respective contours of the first edge surface and the chip pit The axis of the cutter head itself is axisymmetric.

The beneficial effect of adopting the above-mentioned technical solution is: the gear blank can be processed, and the gap between adjacent teeth can be processed in one processing. The gear blank itself has relatively high strength and hardness, so if one-time processing is to be completed, the cutting amount must not be small. . A milling cutter can realize the processing of grooves in one feeding and retracting process, and high precision, high speed and high efficiency can be achieved in the process of gear processing. Because the cutting edge group transitions from the first edge surface, the second edge surface, the third edge surface, and the fourth edge surface in sequence, which means that each rotation of the cutter head has four gradually changing edges for cutting. The cutting efficiency is high, the cutting amount of each blade surface is reduced, and the processing volume requirement for each blade surface is reduced, which solves the problem of high-efficiency milling and guarantees the accuracy of the product and the tool life, and avoids the extremely difficult time when milling gears. Easy to produce shock knife. The chip pit can ensure that the processed chips are stored here at the first time, and wait for subsequent discharge. A cutting edge group with a chip pit is the most basic cutting unit. The head and tail contours of this cutting unit are axisymmetric when rotating in the circumferential direction, and the trajectory can be overlapped, which ensures the stability of the tool during operation and prevents The workpiece produces eccentric force and torsion force on the tool, and also ensures that the groove after machining is axisymmetric.

As a further improvement of the present invention, projected along the axial view angle of the cutter head, the profile development angle occupied by a cutting edge group and an adjacent chip pocket is a flat angle, and the chip pocket includes two first chip pockets that intersect at an angle plane, the second chip plane, the first chip plane is connected to the fourth edge face, the second chip planes of the two chip pits are parallel to each other and parallel to the axis of the cutter head, along the line perpendicular to the second chip In the perspective projection of the plane, the edges of the contours of the first cutting surface and the chip pit are axisymmetric along the axis of the cutter head itself.

The beneficial effect of adopting the above-mentioned technical solution is that the cutting unit undergoes two cutting units after one rotation of the cutter head; To ensure that the debris is discharged instead of allowing the debris to remain in the next rotary processing, so as to avoid affecting the machining accuracy.

As a further improvement of the present invention, the lengths of the first cutting surface, the second cutting surface, the third cutting surface, the fourth cutting surface and the chip pocket along the axial direction of the cutter head are gradually lengthened.

The beneficial effect of adopting the above-mentioned technical solution is that the shorter the blade surface that is in contact with the workpiece first, the shorter it also ensures that the cutting amount will not be too much, so that the cutting amount can be distributed evenly from front to back, instead of The initial cutting amount is large, and the subsequent cutting amount is small. The gradually elongated layout is also easy to guide the debris to be discharged in the direction away from the cutter head.

As a further improvement of the present invention, the respective first edge surfaces of the two cutting edge groups are connected.

The beneficial effect of adopting the above-mentioned technical solution is to ensure that the frontmost top of the cutter head has a cutting edge.

As a further improvement of the present invention, the first edge surface and the second edge surface are connected to the chip pit, and the second edge surface is connected to the fourth edge surface.

The beneficial effect of adopting the above-mentioned technical solution is to ensure that the debris processed at the ends of the first blade surface and the second blade surface can also have a way to enter the chip pit at the first time. The connection between the second blade surface and the fourth blade surface eliminates the need for the third blade surface to also be connected to the chip pit, which reduces the density of the boundary line at the top of the cutter head and reduces the processing difficulty.

As a further improvement of the present invention, the fourth blade surface is a plane, and the first blade surface, the second blade surface, and the third blade surface are each curved surfaces with convex arc surfaces and concave arc surfaces.

The beneficial effect of adopting the above technical solution is that: the inner wall of the processed groove itself also has a convex arc surface and a concave arc surface. The fourth blade surface is the last blade surface, and the main cutting function is the boundary line between the fourth blade surface and the third blade surface, so the fourth blade surface is a plane, which reduces the processing difficulty of the tool.

As a further improvement of the present invention, peripheral teeth are provided on the circumferential surface of the cutter head, and along the opposite direction of rotation of the cutter head, the peripheral teeth include a first peripheral tooth surface and a second peripheral tooth surface which are connected in sequence and form an angle with each other.

The beneficial effect of adopting the above technical solution is that the peripheral teeth can cut the relatively side surface of the groove, corresponding to the top end of the processed gear, and ensure the dimensional accuracy here after processing.

As a further improvement of the present invention, the first peripheral tooth surface is connected to the first blade surface, and the second peripheral tooth surface is connected to the first blade surface, the second blade surface, and the third blade surface.

The beneficial effect of adopting the above technical solution is that the area of the tooth surface of the second circumference is larger than that of the tooth surface of the first circumference.

As a further improvement of the present invention, the first peripheral tooth surface and the second peripheral tooth surface are both planes, projected along the axial view angle of the cutter head, and the second peripheral tooth surface and the peripheral surface of the root of the cutter head form an arcuate surface.

The beneficial effect of adopting the above-mentioned technical solution is that: the arcuate surface also avoids a chip removal space equivalently.

As a further improvement of the present invention, the relief angles corresponding to the first blade face, the second blade face, and the third blade face are 8°, 15°, and 26°, respectively.

The beneficial effect of adopting the above technical solution is: the selection of the above angles determines that the cutting effect of the first blade surface, the second blade surface and the third blade surface is step by step, and the selection of the angle can obtain better cutting and chip removal effects .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a front view of an embodiment of the present invention.

Figure 2 is an axial view of a cutter head according to one embodiment of the present invention.

Fig. 3 is a partially enlarged view at A of an embodiment of the present invention.

Fig. 4 is an application schematic diagram of an embodiment of the present invention.

Fig. 5 is a partially enlarged view at B of an embodiment of the present invention.

1-handle; 2-cutter head; 3-first blade surface; 4-second blade surface; 5-third blade surface; 6-first tooth surface; 7-second tooth surface; 8-th Four-edge surface; 9-chip pit; 9a-first chip plane; 9b-second chip plane; 10-work piece; 11-groove; 12-arcuate surface; L1-total length of cutter body; L2- Total length of the blade; L3-total length of the flute; D1-diameter of the cutter head; D2-diameter of the handle; A1-backlash angle; A2-front angle; H1-end tooth eccentric distance; H2-peripheral tooth first relief angle width; H3-peripheral tooth relief angle total width.

Detailed ways

Below in conjunction with specific embodiment, content of the present invention is described in further detail:

In order to achieve the purpose of the present invention, a high-efficiency gear milling cutter includes: a tool handle 1; a cutter head 2, which is coaxially fixed with one side of the tool handle 1; a cutting edge group, which rotates in the opposite direction of the cutter head 2 , each cutting edge group includes sequentially connected first edge face 3, second edge face 4, third edge face 5, fourth edge face 8; chip pocket 9, recessed in the surface of the cutter head 2 and connected with the fourth edge The surface 8 is connected; the cutter head 2 is equipped with two cutting edge groups and two chip pockets 9 respectively, projected along the axial perspective of the cutter head 2, the contours of the cutting edge groups and the chip pockets 9 are centrally symmetrical figures, along the Viewed perpendicular to the axis of the cutter head 2 , the edges of the outlines of the first edge face 3 and the chip pocket 9 are axisymmetric along the axis of the cutter head 2 itself.

As shown in FIG. 4 , the cutter head 2 processes the workpiece 10 to form symmetrical grooves 11 , that is, to process the gear blank to process the grooves 11 between the connected teeth. A tungsten-titanium-cobalt alloy in which the handle 1 and the cutter head 2 are integrated.

The beneficial effect of adopting the above-mentioned technical solution is: the gear blank can be processed, and the gap between adjacent teeth can be processed in one processing. The gear blank itself has relatively high strength and hardness, so if one-time processing is to be completed, the cutting amount must not be small. . A milling cutter can realize the processing of grooves in one feeding and retracting process, and high precision, high speed and high efficiency can be achieved in the process of gear processing. Because the cutting edge group transitions from the first edge surface, the second edge surface, the third edge surface, and the fourth edge surface in sequence, which means that each rotation of the cutter head has four gradually changing edges for cutting. The cutting efficiency is high, the cutting amount of each blade surface is reduced, and the processing volume requirement for each blade surface is reduced, which solves the problem of high-efficiency milling and guarantees the accuracy of the product and the tool life, and avoids the extremely difficult time when milling gears. Easy to produce shock knife. The chip pit can ensure that the processed chips are stored here at the first time, and wait for subsequent discharge. A cutting edge group with a chip pit is the most basic cutting unit. The head and tail contours of this cutting unit are axisymmetric when rotating in the circumferential direction, and the trajectory can be overlapped, which ensures the stability of the tool during operation and prevents The workpiece produces eccentric force and torsion force on the tool, and also ensures that the groove after machining is axisymmetric.

In other embodiments of the present invention, projected along the axial view angle of the cutter head 2, the profile development angle occupied by a cutting edge group and a chip pit 9 adjacent to it is a flat angle, and the chip pit 9 includes two angles The intersecting first chip plane 9a and second chip plane 9b, the first chip plane 9a is connected to the fourth edge surface 8, and the second chip planes 9b of the two chip pits 9 are parallel to each other and parallel to the cutting edge. The own axis of the head 2 is projected along the perspective perpendicular to the second chip-containment plane 9b, and the edges of the outlines of the first edge face 3 and the chip pocket 9 are axisymmetric along the axis of the cutter head 2 itself.

The beneficial effect of adopting the above-mentioned technical solution is that the cutting unit undergoes two cutting units after one rotation of the cutter head; To ensure that the debris is discharged instead of allowing the debris to remain in the next rotary processing, so as to avoid affecting the machining accuracy.

In some other embodiments of the present invention, the first cutting surface 3 , the second cutting surface 4 , the third cutting surface 5 , the fourth cutting surface 8 , and the chip pocket 9 are gradually longer along the axial direction of the cutter head 2 .

The beneficial effect of adopting the above-mentioned technical solution is that the shorter the blade surface that is in contact with the workpiece first, the shorter it also ensures that the cutting amount will not be too much, so that the cutting amount can be distributed evenly from front to back, instead of The initial cutting amount is large, and the subsequent cutting amount is small. The gradually elongated layout is also easy to guide the debris to be discharged in the direction away from the cutter head.

In some other embodiments of the present invention, the respective first edge surfaces 3 of the two cutting edge groups are connected.

The beneficial effect of adopting the above-mentioned technical solution is to ensure that the frontmost top of the cutter head has a cutting edge.

In other embodiments of the present invention, the first edge face 3 and the second edge face 4 are connected to the chip pocket 9 , and the second edge face 4 is connected to the fourth edge face 8 .

The beneficial effect of adopting the above-mentioned technical solution is to ensure that the debris processed at the ends of the first blade surface and the second blade surface can also have a way to enter the chip pit at the first time. The connection between the second blade surface and the fourth blade surface eliminates the need for the third blade surface to also be connected to the chip pit, which reduces the density of the boundary line at the top of the cutter head and reduces the processing difficulty.

In other embodiments of the present invention, the fourth blade surface 8 is a plane, and the first blade surface 3 , the second blade surface 4 , and the third blade surface 5 are each curved surfaces with convex arc surfaces and concave arc surfaces.

The beneficial effect of adopting the above technical solution is that: the inner wall of the processed groove itself also has a convex arc surface and a concave arc surface. The fourth blade surface is the last blade surface, and the main cutting function is the boundary line between the fourth blade surface and the third blade surface, so the fourth blade surface is a plane, which reduces the processing difficulty of the tool.

In other embodiments of the present invention, the peripheral surface of the cutter head 2 is provided with peripheral teeth, and along the opposite direction of rotation of the cutter head 2, the peripheral teeth include a first peripheral tooth surface 6, a second peripheral tooth surface, Tooth surface 7.

The beneficial effect of adopting the above technical solution is that the peripheral teeth can cut the relatively side surface of the groove, corresponding to the top end of the processed gear, and ensure the dimensional accuracy here after processing.

In other embodiments of the present invention, the first peripheral tooth surface 6 is connected to the first blade surface 3 , and the second peripheral tooth surface 7 is connected to the first blade surface 3 , the second blade surface 4 and the third blade surface 5 .

The beneficial effect of adopting the above technical solution is that the area of the tooth surface of the second circumference is larger than that of the tooth surface of the first circumference.

In other embodiments of the present invention, the first peripheral tooth surface 6 and the second peripheral tooth surface 7 are both planes, projected along the axial view angle of the cutter head 2, and the second peripheral tooth surface 7 and the peripheral surface of the root of the cutter head 2 Surrounded by an arcuate surface 12.

As shown in Figure 1, the total length L1 of the cutter body composed of the cutter head 2 and the handle 1 can be determined according to the actual situation. The axial length between the arcuate surface 12 and the top of the cutter head is the total length L2 of the blade, and the axial length of the chip pocket 9 is the longest. The distance is the total length L3 of the sipe, the total length L2 of the blade and the total length L3 of the sipe can be determined according to the actual situation. The cutter head diameter D1 and the cutter handle diameter D2 are also determined according to the actual situation. Backlash angle A1 is 18°. As shown in FIG. 3 , the front angle A2 is 5°, the first relief angle A3 of the peripheral teeth is 6° to 8°, and the second relief angle A4 of the peripheral teeth is 20° to 28°. As shown in Figure 2, the eccentric distance H1 of the end teeth is related to the diameter D1 of the cutter head. When the diameter D1 of the cutter head is 7mm, the eccentric distance H1 of the end teeth is 0.04mm. The value of the first relief width H2 of the peripheral tooth is equal to 0.5% to 0.6% of the diameter D1 of the cutter head, and the value of the total width H3 of the relief angle of the peripheral tooth is equal to 15% to 20% of the diameter D1 of the cutter head.

The beneficial effect of adopting the above-mentioned technical solution is that: the arcuate surface also avoids a chip removal space equivalently.

In other embodiments of the present invention, the relief angles corresponding to the first blade surface 3 , the second blade surface 4 , and the third blade surface 5 are 8°, 15°, and 26°, respectively.

The beneficial effect of adopting the above technical solution is: the selection of the above angles determines that the cutting effect of the first blade surface, the second blade surface and the third blade surface is step by step, and the selection of the angle can obtain better cutting and chip removal effects .

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention. Substantial equivalent changes or modifications shall fall within the protection scope of the present invention.

Claims (10)

1. A high-efficiency gear milling cutter, characterized in that, comprising: handle; The cutter head is fixed coaxially with one side of the shaft end of the handle; Cutting edge groups, along the opposite direction of cutter head rotation, each cutting edge group includes sequentially connected first edge face, second edge face, third edge face, and fourth edge face; The chip pit is recessed on the surface of the cutter head and connected to the fourth edge face; Each of the cutter head is equipped with two cutting edge groups and two chip pockets, projected along the axial view angle of the cutter head, and the respective contours of the cutting edge groups and chip pockets are center-symmetrical figures, and are perpendicular to the cutter head. From the perspective of the axis, the edges of the contours of the first cutting surface and the chip pocket are axisymmetric along the axis of the cutter head itself. 2. The high-efficiency gear milling cutter according to claim 1, characterized in that: along the axial viewing angle projection of the cutter head, the profile development angle occupied by a cutting edge group and a chip pocket adjacent to it is a flat angle, and the volume The chip pit includes two first chip holding planes and second chip holding planes intersecting at an angle, the first chip holding plane is connected to the fourth edge surface, and the second chip holding planes of the two chip pockets are parallel to each other and Parallel to the own axis of the cutter head and projected along a perspective perpendicular to the second chip-containment plane, the edges of the contours of the first edge face and the chip pocket are axisymmetric along the own axis of the cutter head. 3. The high-efficiency gear milling cutter according to claim 2, characterized in that: the length of the first blade surface, the second blade surface, the third blade surface, the fourth blade surface, and the chip pit along the axial direction of the cutter head gradually grow. 4. The high-efficiency gear milling cutter according to claim 2, characterized in that the respective first edge surfaces of the two cutting edge groups are connected. 5. The high-efficiency gear milling cutter according to claim 4, characterized in that: the first and second edge surfaces are connected to the chip pocket, and the second edge surface is connected to the fourth edge surface. 6. The high-efficiency gear milling cutter according to claim 5, characterized in that: the fourth blade surface is a plane, and each of the first blade surface, the second blade surface, and the third blade surface has a convex arc surface , concave curved surface. 7. The high-efficiency gear milling cutter according to claim 2, characterized in that: the peripheral surface of the cutter head is equipped with peripheral teeth, and along the opposite direction of rotation of the cutter head, the peripheral teeth include successively connected and mutually angled The first tooth surface and the second tooth surface. 8. The high-efficiency gear milling cutter according to claim 7, characterized in that: the first peripheral tooth surface is connected to the first blade surface, and the second peripheral tooth surface is connected to the first blade surface, the second blade surface, The third blade faces are connected. 9. The high-efficiency gear milling cutter according to claim 8, characterized in that: the first peripheral tooth surface and the second peripheral tooth surface are both planes, projected along the axial view angle of the cutter head, and the second peripheral tooth The surface and the circumferential surface of the root of the cutter head form an arcuate surface. 10. The high-efficiency gear milling cutter according to claim 1, characterized in that: the relief angles corresponding to the first blade face, the second blade face, and the third blade face are respectively 8°, 15°, and 26° .