CN219648789U - Three-edge PCD end mill - Google Patents

Abstract

The utility model relates to the technical field of milling cutters and discloses a three-edge PCD end milling cutter. This three sword PCD end mill includes cutter arbor and three cutter body, and three mounting groove and chip groove have been seted up to the one end of cutter arbor, and the circumference interval setting of cutter arbor is followed to three mounting groove, and the chip groove is located between two adjacent mounting grooves, and one of them lateral wall of mounting groove is the welded surface, and every cutter body all part holding is in the mounting groove that corresponds, and every cutter body all includes PCD blade and the alloy carrier of looks superpose, and PCD blade welding is fixed in on the welded surface. Compared with the arrangement that the alloy carrier is welded and fixed on the welding surface in the prior art, the PCD blade is welded and fixed on the welding surface, the blade diameter can be reduced without deepening the depth of the mounting groove, the structural strength can be ensured, and the chip removal space can be ensured. The end mill with small diameter can meet the milling requirement of small-size parts, has strong universality, and the PCD material has high blade hardness and higher cutting efficiency, thereby prolonging the service life of the milling cutter.

Description

Three-edge PCD end mill

Technical Field

The utility model relates to the technical field of milling cutters, in particular to a three-edge PCD end milling cutter.

Background

Milling cutters are rotary tools for milling with one or more cutter teeth which, in operation, intermittently cut the remainder of a workpiece in sequence. Milling cutters are mainly used for machining planes, steps, grooves, forming surfaces, cutting workpieces, etc. on milling machines, and the types are mainly face milling cutters, cylindrical milling cutters, key slot milling cutters, end milling cutters, etc. In milling, an end mill is the most widely used type of milling high-speed machining center.

Polycrystalline diamond (PCD) materials are currently known to have the highest hardness tool materials, with grinding or laser sharpening to achieve excellent cutting performance and ultra-long working life. In recent years, as the number of layers of circuit board plates is gradually increased and novel fillers are adopted, the processing difficulty is gradually increased, higher requirements are put on the wear resistance of the cutter, and PCD cutters are gradually popularized in the circuit board processing field.

PCD cutters generally comprise a PCD layer and a carrier alloy layer, the total thickness of the PCD layer and the carrier alloy layer being above 1.0mm, and the cutter diameter and the cutter number of the patch-welded PCD cutter are limited to a certain extent due to the thickness of the PCD cutter. Taking a PCD cutter with the thickness of 1.0mm as an example, a traditional three-blade structure is adopted, and the common practice is to weld a carrier alloy layer of the cutter on a welding surface of an installation groove at the end part of a cutter bar, and in order to ensure structural strength and chip removal capability, the installation groove cannot be processed too deeply, so that the blade diameter of the cutter is only 5.0mm at minimum. Thus, the overall size of the cutter is relatively large, and the cutter is not suitable for parts with small sizes and has poor universality.

Accordingly, there is a need to provide a three-edged PCD end mill that addresses the above-described problems.

Disclosure of Invention

The utility model aims to provide a three-edge PCD end mill, which can reduce the edge diameter to a certain extent, meet the requirements of small-size parts and has an ultra-long service life on the premise of ensuring a chip removal space.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a three-edged PCD end mill comprising:

the cutter bar is provided with three mounting grooves and three chip removal grooves at one end, the three mounting grooves are arranged at intervals along the circumferential direction of the cutter bar, the chip removal grooves are positioned between two adjacent mounting grooves, and one side wall of each mounting groove is a welding surface;

and the three cutter bodies are respectively partially accommodated in the corresponding mounting grooves, each cutter body comprises a PCD blade and an alloy carrier which are overlapped, and the PCD blades are fixedly welded on the welding surface.

Preferably, the three mounting grooves are arranged at equal intervals along the circumferential direction of the cutter bar, and the three chip removal grooves are arranged at equal intervals along the circumferential direction of the cutter bar.

Preferably, the mounting groove is radially arranged from the center of the cutter bar to the outer edge, and the mounting groove is provided with two first side walls, and the two first side walls are mutually perpendicular.

Preferably, the bottom of the mounting groove is a first straight line section, the first straight line section is formed by intersecting two first side walls, and an included angle between the first straight line section and the central axis of the cutter bar is-10 degrees to +10 degrees.

Preferably, the chip removing groove is radially arranged from the center of the cutter bar to the outer edge, and the chip removing groove is provided with two second side walls, and the two second side walls are perpendicular to each other.

As a preferable scheme, the bottom of the chip removal groove is a second straight line segment, the second straight line segment is formed by intersecting two second side walls, and the included angle between the second straight line segment and the central axis of the cutter bar is 20-40 degrees.

Preferably, the side wall of the mounting groove and the side wall of the chip removal groove are converged into a straight line on the end face of the cutter bar.

Preferably, the PCD blade comprises peripheral teeth and end teeth which are connected, wherein the peripheral teeth are arranged along the axial direction of the cutter bar, and the end teeth are arranged along the radial direction of the cutter bar.

Preferably, the peripheral tooth comprises a first flank and a second flank, and the first flank and the second flank are arranged at an included angle to form a peripheral edge; and/or

The end tooth comprises a third flank and a fourth flank, and the third flank and the fourth flank are arranged at an included angle to form an end edge.

As a preferable scheme, the cutter bar comprises a cutter bar end and a cutter head end which are connected, the diameter of the cutter bar end is larger than that of the cutter head end, and the cutter body is arranged at one end of the cutter head end far away from the cutter bar end.

The beneficial effects of the utility model are as follows:

the utility model provides a three-edge PCD end mill, which comprises a cutter bar and three cutter bodies, wherein one end of the cutter bar is provided with three mounting grooves and three chip removal grooves, the chip removal grooves are positioned between two adjacent mounting grooves and are used for smoothly removing chips during milling, one side wall of each mounting groove is a welding surface, each cutter body is partially accommodated in the corresponding mounting groove, each cutter body comprises a PCD blade and an alloy carrier which are overlapped, and the PCD blade is welded and fixed on the welding surface. Compared with the arrangement that the alloy carrier is welded and fixed on the welding surface in the prior art, the PCD blade is welded and fixed on the welding surface, the blade diameter can be reduced without deepening the depth of the mounting groove, the structural strength can be ensured, and the chip removal space can be ensured. The small-diameter end mill can meet the milling requirement of small-size parts, has strong universality and has an ultra-long service life.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a cutter bar according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a side view of a tool bar provided in an embodiment of the utility model;

FIG. 4 is a schematic view of the overall structure of a three-edged PCD end mill provided in an embodiment of the present utility model;

fig. 5 is a schematic structural view of a cutter body according to an embodiment of the present utility model;

FIG. 6 is a top view of a three-edge PCD end mill provided in an embodiment of the present utility model;

FIG. 7 is a side view of a three-edge PCD end mill provided in an embodiment of the present utility model.

In the figure:

1. a cutter bar; 11. a knife handle end; 12. a cutter head end; 13. a mounting groove; 131. a first sidewall; 132. a welding surface; 133. a first straight line segment; 14. a chip removal groove; 141. a second sidewall; 142. a second straight line segment;

2. a cutter body; 21. PCD blade; 211. peripheral teeth; 2111. a first relief surface; 2112. a second relief surface; 2113. a peripheral edge; 212. end teeth; 2121. a third relief surface; 2122. a fourth relief surface; 2123. an end blade; 22. an alloy carrier.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, 2 and 4, the present embodiment provides a three-edge PCD end mill, which includes a cutter bar 1 and three cutter bodies 2, wherein the cutter bar 1 has a cylindrical rod-shaped structure and is made of cemented carbide, so that the service life of the cutter bar can be prolonged. Three mounting grooves 13 and three junk slots 14 are formed in one end of the cutter bar 1, the three mounting grooves 13 are arranged at intervals along the circumferential direction of the cutter bar 1, and one side wall of each mounting groove 13 is a welding surface 132. The chip removal grooves 14 are located between two adjacent mounting grooves 13 for smooth chip removal during milling. Each cutter body 2 is partially accommodated in the corresponding mounting groove 13, and the three cutter bodies 2 are annularly arranged along the circumferential direction of the cutter bar 1 to form a circular profile, and the outer diameter of the circular profile is the edge diameter of the milling cutter.

Specifically, as shown in fig. 4, each cutter body 2 includes a PCD blade 21 and an alloy carrier 22 stacked one on top of the other. Wherein, PCD blade 21 includes the peripheral tooth 211 and the end tooth 212 that are connected, and peripheral tooth 211 sets up along the axial of cutter arbor 1, and end tooth 212 sets up along the radial of cutter arbor 1, and peripheral tooth 211 and end tooth 212 are all used for cutting. The surface of the PCD blade 21 away from the alloy carrier 22 is a polished surface, and the polished surface is bonded to the bonding surface 132 and then welded and fixed, so that the polished surface is formed into the rake surfaces of the end teeth 212 and the peripheral teeth 211. The alloy carrier 22 does not participate in welding, only serves as a supporting carrier of the PCD blade 21, ensures the structural strength of the cutter body 2, and prevents the PCD blade 21 from being broken under stress.

Compared with the prior art in which the alloy carrier 22 is welded and fixed on the welding surface 132, the cutter body 2 is welded and fixed on the welding surface 132 in the present embodiment, that is, the PCD blade 21 is welded and fixed on the welding surface 132, the edge diameter of the milling cutter can be reduced without deepening the depth of the mounting groove 13, and the edge diameter can be reduced to 3.0mm through experiments, so that the structural strength can be ensured, and the chip removal space can be ensured. The small-diameter end mill can meet the cutting requirements of small-size parts, and has strong universality. Through the blade that adopts the PCD material, make milling cutter have hardness height, compressive strength height, heat conductivity and wear resistance good characteristic, cutting efficiency is higher to extension milling cutter's life.

Preferably, as shown in fig. 1, the cutter bar 1 includes a cutter end 11 and a cutter head end 12 which are connected, the diameter of the cutter end 11 is larger than that of the cutter head end 12, and the mounting groove 13 and the chip removing groove 14 are both formed on an end surface of the cutter head end 12 away from the cutter end 11, i.e. the cutter body 2 is mounted on an end of the cutter head end 12 away from the cutter head end 11. The diameter of the shank end 11 is 3.175mm of the general standard diameter of the circuit board industry so as to be convenient to clamp, the diameter of the tool bit end 12 is 2.5mm, and the diameter is smaller than the edge diameter of the milling cutter, so that interference with a workpiece during milling is avoided.

Preferably, the three mounting grooves 13 are equally spaced in the circumferential direction of the cutter bar 1 at a rotation angle of 120 ° so that the cutter bodies 2 are evenly spaced in the circumferential direction of the cutter bar 1 at a rotation angle of 120 °. The three junk slots 14 are equally spaced along the circumference of the tool bar 1, and the rotation angle is 120 degrees. The milling cutter has the advantages of simple integral structure and reasonable design and layout.

Further, as shown in fig. 2, the mounting groove 13 is radially arranged from the center of the cutter bar 1 to the outer edge, and the mounting groove 13 has two first side walls 131, and the two first side walls 131 are perpendicular to each other, i.e. L-shaped. The shape of the mounting groove 13 is matched with the shape of one corner of the cutter body 2, when the cutter body 2 is integrally placed in the mounting groove 13, one surface of the PCD blade 21, which is far away from the alloy carrier 22, is attached to and welded with one of the first side walls 131, and the first side wall 131 is a welding surface 132. While the plane formed by the sides of the PCD blade 21 and the side of the alloy carrier 22 is conformed to the other first sidewall 131.

It should be noted that, since the two first sidewalls 131 are perpendicular to each other, a radial projection of one of the first sidewalls 131 coincides with the first straight line segment 133 in the view of fig. 3. Preferably, as shown in fig. 2 and 3, the bottom of the mounting groove 13 is a first straight line segment 133, the first straight line segment 133 is formed by intersecting two first side walls 131, and an included angle γ between the first straight line segment 133 and the central axis of the cutter bar 1 is-10 ° to +10°, preferably 5 °, and the included angle γ is equal to the front angle of the end tooth 212. Through setting the contained angle gamma to 5, can be when satisfying milling cutter minor diameter demand, can also guarantee milling cutter's sharpness, and then make the cutting lighter and faster, reduce cutting deformation and friction for processing surface quality is higher.

Further, as shown in fig. 2, the chip removing groove 14 is radially arranged from the center of the cutter bar 1 to the outer edge, the chip removing groove 14 is provided with two second side walls 141, and the two second side walls 141 are mutually perpendicular, namely, L-shaped, so that smooth chip removal is ensured, and chip removal capability is enhanced. During machining, chips flowing through the rake face are discharged through the junk slots 14 so that cutting proceeds smoothly.

It should be noted that, since the two second sidewalls 141 are perpendicular to each other, a radial projection of one of the second sidewalls 141 coincides with the second straight line segment 142 in the view of fig. 3. Preferably, as shown in fig. 2 and 3, the bottom of the chip removing groove 14 is a second straight line segment 142, the second straight line segment 142 is formed by intersecting two second side walls 141, and the included angle α between the second straight line segment 142 and the central axis of the cutter bar 1 is 20 ° to 40 °, preferably 30 °, and the included angle α is the chip removing direction, which also determines the depth of the chip removing groove 14. If the included angle α is too small, the junk slots 14 are deeper, and the structural strength of the cutter head end 12 cannot be ensured; if the included angle α is set too large, the junk slots 14 are shallower, and smooth junk removal cannot be ensured. Therefore, by setting the included angle alpha to 30 degrees, the structural strength of the milling cutter can be ensured while smooth chip removal is ensured.

It will be appreciated that if the end face of the tool tip end 12 has a flat surface, the flat surface is detrimental to chip removal from the rake face during cutting, and even may cause some damage to the tool and workpiece. In order to solve the above problem, as shown in fig. 2, the side wall of the installation groove 13 and the side wall of the junk slot 14 are converged into a straight line on the end surface of the tool bar 1. Illustratively, each first sidewall 131 of the mounting slot 13 extends and converges in a straight line with the second sidewall 141 of the adjacent junk slot 14. By adopting the arrangement, smooth chip removal of the rake face can be ensured.

Further, as shown in fig. 5 and 6, the peripheral tooth 211 specifically includes a first flank 2111 and a second flank 2112, the first flank 2111 and the second flank 2112 being disposed at an angle to form a peripheral edge 2113, and a relief angle β1 of the first flank 2111 and a relief angle β2 of the second flank 2112 are preferably 5 ° and 20 °, respectively. With the above arrangement, not only the friction force between the first flank 2111 and the second flank 2112 and the workpiece can be reduced, but also the sharpness of the peripheral edge 2113 can be ensured.

Further, as shown in fig. 5 and 7, the end tooth 212 specifically includes a third flank 2121 and a fourth flank 2122, the third flank 2121 and the fourth flank 2122 being disposed at an angle to form an end edge 2123. The relief angle β3 of the third relief surface 2121 and the relief angle β4 of the fourth relief surface 2122 are preferably 6 ° and 30 °, respectively. By the above arrangement, not only the friction force between the third flank 2121 and the fourth flank 2122 and the workpiece can be reduced, but also the sharpness of the end edge 2123 can be ensured.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. Three-edged PCD end mill, characterized in that it comprises:

the cutter bar (1) is provided with three mounting grooves (13) and three chip removal grooves (14) at one end, the three mounting grooves (13) are arranged at intervals along the circumferential direction of the cutter bar (1), the chip removal grooves (14) are positioned between two adjacent mounting grooves (13), and one side wall of each mounting groove (13) is a welding surface (132);

and the three cutter bodies (2) are respectively partially accommodated in the corresponding mounting grooves (13), each cutter body (2) comprises a PCD blade (21) and an alloy carrier (22) which are overlapped, and the PCD blade (21) is fixedly welded on the welding surface (132).

2. The three-edged PCD end milling cutter according to claim 1, wherein three of the mounting slots (13) are equally spaced along the circumference of the cutter bar (1) and three of the chip removal slots (14) are equally spaced along the circumference of the cutter bar (1).

3. The three-edged PCD end mill according to claim 1, wherein the mounting groove (13) is arranged radially from the centre of the cutter arbor (1) towards the outer edge, the mounting groove (13) having two first side walls (131), the two first side walls (131) being perpendicular to each other.

4. A three-edged PCD end mill according to claim 3, characterized in that the bottom of the mounting groove (13) is a first straight line segment (133), the first straight line segment (133) being formed by the intersection of two first side walls (131), the first straight line segment (133) having an angle of-10 ° to +10° with the centre axis of the cutter arbor (1).

5. The three-edged PCD end milling cutter according to claim 1, wherein the junk slots (14) are arranged radially from the centre of the cutter arbor (1) towards the outer edge, the junk slots (14) having two second side walls (141), the two second side walls (141) being perpendicular to each other.

6. The three-edge PCD end mill according to claim 5, wherein the flute bottom of the junk slot (14) is a second straight segment (142), the second straight segment (142) being formed by the intersection of two of the second side walls (141), the second straight segment (142) being at an angle of 20 ° to 40 ° to the central axis of the tool shank (1).

7. The three-edged PCD end milling cutter according to claim 4, wherein the side walls of the mounting slot (13) and the side walls of the junk slots (14) converge in a straight line on the end face of the cutter arbor (1).

8. The three-edged PCD end mill according to claim 1, wherein the PCD insert (21) comprises connected peripheral teeth (211) and end teeth (212), the peripheral teeth (211) being arranged in the axial direction of the cutter bar (1), the end teeth (212) being arranged in the radial direction of the cutter bar (1).

9. The three-edged PCD end mill according to claim 8, wherein the peripheral tooth (211) comprises a first flank (2111) and a second flank (2112), the first flank (2111) and the second flank (2112) being arranged at an angle to form a peripheral edge (2113); and/or

The end tooth (212) comprises a third flank (2121) and a fourth flank (2122), wherein the third flank (2121) and the fourth flank (2122) are arranged at an included angle to form an end edge (2123).

10. The three-edged PCD end milling cutter according to any one of claims 1 to 9, wherein the cutter arbor (1) comprises a shank end (11) and a cutter head end (12) connected, the diameter of the shank end (11) being larger than the diameter of the cutter head end (12), the cutter body (2) being mounted on the end of the cutter head end (12) remote from the shank end (11).