Dovetail groove milling cutter

Abstract

The utility model relates to the technical field of dovetail groove milling cutters, in particular to a dovetail groove milling cutter which comprises a cutter bar. A lower fixing seat and an upper fixing seat are arranged at the bottom end of the cutter bar, a plurality of lower fixing grooves and upper fixing grooves are correspondingly formed in the side curved surface of the lower fixing seat and the side curved surface of the upper fixing seat respectively, and blades are arranged in the corresponding lower fixing grooves and the corresponding upper fixing grooves formed in the lower fixing seat and the upper fixing seat respectively. The lower fixing seat can be taken down from the bottom end of the cutter bar by screwing off the inner hexagonal screw from the threaded hole, a damaged blade can be taken out from the lower fixing groove to be replaced, the lower fixing seat is arranged at the bottom end of the cutter bar after replacement, and the blade is arranged in the lower fixing groove and the upper fixing groove again. And then the inner hexagonal screw rod penetrates through the through hole again and is screwed into the threaded hole, so that the effect of independently replacing the damaged blade is achieved, the situation that the machining cost is increased due to the fact that the blade is damaged and integrally replaced is avoided, and the dovetail groove milling cutter is more convenient to use compared with a traditional dovetail groove milling cutter.

Description

Technical Field

[0001] This utility model relates to the field of dovetail end mill technology, specifically a dovetail end mill. Background Technology

[0002] A dovetail end mill is a machining cutting tool with multiple cutting edges. These edges rotate at high speed to perform special grooving on the surface of the workpiece. The grooving type is different from that of traditional straight-edge grooves. The grooves produced by the dovetail end mill have symmetrical, inwardly inclined edges.

[0003] A patent with publication number CN 202291576 U discloses a dovetail end mill, which consists of a cutter body and a shank connected to each other. The cutter body is truncated cone-shaped. The key feature is that a retaining key is provided on the side wall of one end of the shank. The middle of the truncated cone-shaped cutter body has a mounting hole that matches the shape of the retaining key. The retaining key is engaged in the mounting hole. In short, this dovetail end mill makes it easy to replace the cutter body, and the cutter body and shank are not easy to slip off, making it convenient and practical.

[0004] Because existing dovetail end mills become unusable after the cutting edge is damaged or broken, the entire cutter body needs to be replaced and discarded, and individual cutting edges cannot be replaced, resulting in inconvenience and increased production costs; therefore, a new dovetail end mill is proposed to address the above problems. Utility Model Content

[0005] To overcome the shortcomings of the existing technology and address the problems existing in the existing technology, this utility model proposes a dovetail groove milling cutter.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The dovetail groove milling cutter of this utility model includes a cutter bar; the bottom end of the cutter bar is provided with a lower fixed seat and an upper fixed seat, and the side curved surfaces of the lower fixed seat and the upper fixed seat are respectively provided with a plurality of lower fixed grooves and upper fixed grooves, and the openings between the lower fixed grooves and the upper fixed grooves are respectively corresponding to each other; a lower fixed retaining strip is installed at the bottom of the lower fixed groove, and an upper fixed retaining strip is installed at the top of the upper fixed groove;

[0007] Lower insert plates are installed at the upper opening of the lower fixing groove, and upper insert plates are installed at the lower opening of the upper fixing groove. The upper insert plates and lower insert plates are arranged opposite each other. The upper insert plates installed at the lower opening of the upper fixing groove can be pinned into the corresponding lower fixing groove, and the lower insert plates installed at the upper opening of the lower fixing groove can be pinned into the corresponding upper fixing groove. Blades are respectively provided in the corresponding lower fixing groove and upper fixing groove of the lower fixing seat and the upper fixing seat. The lower insert plates and upper insert plates are respectively attached to the upper and lower sides of the blade and are located on opposite sides of the blade.

[0008] The blade consists of a connector plate and a cutting edge. The connector plate is simultaneously installed in the corresponding lower and upper fixing slots. The connector plate has a No. 3 slot for engaging with the upper fixing strip, and a No. 4 slot for engaging with the lower fixing strip. This combination achieves the function of fixing the blade, preventing the blade from falling out of the lower and upper fixing slots during use, and facilitating the replacement of the blade.

[0009] Preferably, a positioning ring is installed on the tool holder, and the upper fixing seat is slidably disposed at the bottom end of the tool holder through a through groove. The upper fixing seat is provided with an annular groove that fits into the positioning ring, which together achieves the function of limiting the installation of the upper fixing seat and ensures the normal use of the milling cutter.

[0010] Preferably, the bottom end of the tool holder has a threaded hole, the lower fixing seat has a fitting groove that fits into the bottom end of the tool holder, and the bottom of the lower fixing seat has a through hole that communicates with the fitting groove. An internal hexagonal screw is provided in the through hole, and the top end of the internal hexagonal screw extends into the threaded hole, which together achieves the function of installing the lower fixing seat and can fix the blade between the lower fixing seat and the upper fixing seat.

[0011] Preferably, the top of the lower insert plate has a first slot that engages with the upper fixing strip, and the bottom of the upper insert plate has a second slot that engages with the lower fixing strip. This combination achieves the function of limiting the installation of the lower fixing seat and the upper fixing seat, and also enables the blade to be squeezed and limited during installation.

[0012] Preferably, the lower fixing strip and the upper fixing strip are installed in a staggered manner, and the third slot and the fourth slot are opened in a staggered manner, which together achieves the function of fixing the blade and improves the strength of the blade.

[0013] Preferably, the bottom end of the tool holder has two symmetrically arranged No. 1 positioning holes, and the bottom of the fitting groove of the lower fixing seat has two symmetrically arranged No. 1 positioning pins that are inserted into the No. 1 positioning holes. The bottom side of the tool holder has two symmetrically arranged positioning rib grooves, and the inner wall of the fitting groove of the lower fixing seat has two symmetrically arranged positioning ribs that are locked and limited. The combination of these features achieves the function of limiting the installation of the tool holder and the lower fixing seat, ensuring the accuracy of installation.

[0014] Preferably, the lower part of the upper fixed seat is provided with two positioning holes evenly distributed, and the two positioning holes are staggered with the upper fixed groove. The upper part of the lower fixed seat is provided with two positioning pins that are inserted into the two positioning holes. The cooperation achieves the function of limiting the installation of the upper fixed seat and the lower fixed seat, and ensures the transmission effect between the lower fixed seat and the upper fixed seat.

[0015] The advantages of this utility model are:

[0016] 1. This utility model allows the lower fixing seat to be removed from the bottom of the tool holder by unscrewing the internal hexagonal screw from the threaded hole, thus separating the lower fixing seat from the upper fixing seat. The upper side of the cutting tool will then move out of the upper fixing groove, allowing the damaged cutting tool to be removed from the lower fixing groove for replacement. After replacement, the lower fixing seat is placed back on the bottom of the tool holder, allowing the cutting tool to be repositioned in both the lower and upper fixing grooves. Finally, the internal hexagonal screw is screwed back into the threaded hole through the through hole. This design achieves the purpose of replacing damaged cutting tools individually, avoiding the increased processing costs associated with replacing the entire tool when the cutting edge is damaged. Compared to traditional dovetail milling cutters, this design is more convenient to use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the first three-dimensional structure;

[0019] Figure 2 Enlarged schematic diagram of the main structure for fixing the blade;

[0020] Figure 3 This is an enlarged schematic diagram of the main structure of the lower fixing base;

[0021] Figure 4 This is an enlarged schematic diagram of the main structure of the upper fixing base;

[0022] Figure 5 Enlarged cross-sectional view of the main structure for fixing the blade;

[0023] Figure 6 This is an enlarged schematic diagram of the blade's main structure;

[0024] Figure 7 This is an enlarged schematic diagram of the main structure of the tool holder.

[0025] In the diagram: 1. Tool holder; 2. Lower fixed seat; 3. Upper fixed seat; 4. Blade; 5. Lower fixed groove; 6. Lower fixed retaining strip; 7. Upper fixed groove; 8. Lower insert plate; 9. No. 1 retaining groove; 10. Upper insert plate; 11. No. 2 retaining groove; 12. Upper fixed retaining strip; 13. Positioning ring; 14. Annular groove; 15. Insert plate; 16. Blade; 17. No. 3 retaining groove; 18. No. 4 retaining groove; 19. Through hole; 20. Threaded hole; 21. Socket headstock screw; 22. Fitting groove; 23. No. 1 positioning hole; 24. No. 1 positioning pin; 25. Positioning rib groove; 26. Positioning rib; 27. No. 2 positioning hole; 28. No. 2 positioning pin; 29. ​​Through groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] Please see Figure 1-7 As shown, a dovetail groove end mill includes a tool holder 1; the bottom end of the tool holder 1 is provided with a lower fixed seat 2 and an upper fixed seat 3, and the side curved surfaces of the lower fixed seat 2 and the upper fixed seat 3 are respectively provided with a plurality of lower fixed grooves 5 and upper fixed grooves 7, and the openings between the lower fixed grooves 5 and the upper fixed grooves 7 are respectively aligned; a lower fixed retaining strip 6 is installed at the bottom of the lower fixed groove 5, and an upper fixed retaining strip 12 is installed at the top of the upper fixed groove 7;

[0028] The lower fixing groove 5 is equipped with a lower insert plate 8 at its upper opening, and the upper fixing groove 7 is equipped with an upper insert plate 10 at its lower opening. The upper insert plate 10 and the lower insert plate 8 are arranged opposite to each other. The upper insert plate 10 installed at the lower opening of the upper fixing groove 7 can be inserted into the corresponding lower fixing groove 5. The lower insert plate 8 installed at the upper opening of the lower fixing groove 5 can be inserted into the corresponding upper fixing groove 7. The corresponding lower fixing groove 5 and upper fixing groove 7 opened by the lower fixing seat 2 and the upper fixing seat 3 are respectively provided with blades 4. The lower insert plate 8 and the upper insert plate 10 are respectively attached to the upper and lower sides of the blade 4 and are located on opposite sides of the blade 4.

[0029] The blade 4 is composed of a connector plate 15 and a blade 16. The connector plate 15 is simultaneously set in the corresponding lower fixing groove 5 and upper fixing groove 7. The connector plate 15 has a third groove 17 for locking and limiting with the upper fixing strip 12, and a fourth groove 18 for locking and limiting with the lower fixing strip 6 is opened at the bottom of the connector plate 15.

[0030] A positioning ring 13 is installed on the tool holder 1, and the upper fixing seat 3 is slidably disposed at the bottom end of the tool holder 1 through the through groove 29, and an annular groove 14 is provided on the upper fixing seat 3 to fit into the positioning ring 13.

[0031] The bottom end of the tool holder 1 is provided with a threaded hole 20, and the lower fixing seat 2 is provided with a fitting groove 22 that fits into the bottom end of the tool holder 1. The bottom of the lower fixing seat 2 is provided with a through hole 19 that communicates with the fitting groove 22. An internal hexagon screw 21 is provided in the through hole 19, and the top end of the internal hexagon screw 21 extends into the threaded hole 20.

[0032] The lower insert plate 8 has a first slot 9 at its top end that fits into the upper fixing strip 12, and the upper insert plate 10 has a second slot 11 at its bottom end that fits into the lower fixing strip 6.

[0033] The lower fixing strip 6 and the upper fixing strip 12 are installed in a staggered manner, and the third slot 17 and the fourth slot 18 are opened in a staggered manner.

[0034] The bottom end of the tool bar 1 is symmetrically provided with two No. 1 positioning holes 23. The bottom of the fitting groove 22 of the lower fixing seat 2 is symmetrically provided with two No. 1 positioning pins 24 that are inserted into the No. 1 positioning holes 23. The bottom side of the tool bar 1 is symmetrically provided with two positioning rib grooves 25. The inner wall of the fitting groove 22 of the lower fixing seat 2 is symmetrically provided with two positioning ribs 26 that are used to lock and limit the positioning.

[0035] The lower part of the upper fixing seat 3 is provided with two positioning holes 27 evenly distributed, and the two positioning holes 27 are staggered with the upper fixing groove 7. The upper part of the lower fixing seat 2 is provided with two positioning pins 28 that are inserted into the two positioning holes 27.

[0036] During operation, existing dovetail milling cutters become unusable after the cutting edge breaks, requiring the entire cutter body to be replaced and discarded. Individual cutting edges cannot be replaced, leading to inconvenience and increased production costs. In this solution, the upper fixing seat 3 is first slidably mounted on the bottom of the cutter shank 1, and the upper fixing seat 3 is fitted into the outer side of the positioning ring 13 via its annular groove 14 at the top. The positioning ring 13 limits the upper fixing seat 3. Then, the inserts 4 are placed into the lower fixing grooves 5 via the insertion plates 15. During placement, the insertion plates 15 are secured to the lower fixing strip 6 via the fourth groove 18 on the lower side, and the inserts 4 are placed against the side of the corresponding lower insertion plate 8. Finally, the lower fixing plate 5 with the inserts 4 is... The fixed seat 2 is fitted onto the bottom end of the tool holder 1 through the fitting groove 22, and the positioning rib 26 in the fitting groove 22 is fitted into the positioning rib groove 25. The first positioning pin 24 is inserted into the first positioning hole 23 for limiting installation. When the lower fixed seat 2 is installed, the upper side of the blade 4 located in the lower fixed groove 5 is inserted into the upper fixed groove 7, and the upper fixed groove 7 is located on the side opposite to the blade 4 and the lower insert plate 8. The lower fixed seat 2 is pushed upward, so that the lower insert plate 8 is inserted upward into the corresponding upper fixed groove 7, and the upper insert plate 10 is inserted into the corresponding lower fixed groove 5. At this time, the blade 4 is locked onto the upper fixed locking strip 12 through the third locking groove 17 opened on the upper side of the insertion plate 15, and the second locking groove at the bottom of the upper insert plate 10 is locked onto the upper fixed locking strip 12. Slot 11 will be engaged with the lower fixing strip 6, and slot 9 at the top of the lower insert plate 8 will be engaged with the upper fixing strip 12. At this time, under the pressure of the upper insert plates 10 and the lower insert plates 8 on both sides, and under the engagement of the lower fixing strip 6 and the upper fixing strip 12, the blade 4 is simultaneously fixed in the lower fixing slot 5 and the upper fixing slot 7. When the lower fixing seat 2 is pushed upward, the second positioning pin 28 will be inserted into the second positioning hole 27 to limit the installation of the lower fixing seat 2 and the upper fixing seat 3. Then, the hexagonal screw 21 is screwed through the through hole 19 into the threaded hole 20, and the screw head of the hexagonal screw 21 is screwed into the lower opening of the through hole 19. The lower fixing seat 2 is fixed to the bottom of the blade shank 1 by the hexagonal screw 21. The blade 4 is fixed between the lower fixing seat 2 and the upper fixing seat 3 for cutting and grooving. When the blade 4 is damaged or broken, the lower fixing seat 2 can be removed from the bottom of the tool holder 1 by unscrewing the hexagonal screw 21 from the threaded hole 20, and the lower fixing seat 2 can be separated from the upper fixing seat 3. The upper side of the blade 4 will then move out of the upper fixing groove 7, allowing the damaged blade 4 to be removed from the lower fixing groove 5 for replacement. After replacement, the complete blade 4 is put back in, and the lower fixing seat 2 is set back at the bottom of the tool holder 1, so that the blade 4 is reset in the lower fixing groove 5 and the upper fixing groove 7. At the same time, the third and fourth slots 17 and 18 on the connector plate 15 are respectively engaged with the lower fixing strip 6 and the upper fixing strip 12.Then, simply re-screw the hex socket head cap screw 21 through the through hole 19 into the threaded hole 20. This achieves the purpose of replacing the damaged cutting edge individually, avoiding the increased machining cost of replacing the entire cutting edge. Compared to traditional dovetail end mills, this method is more convenient to use.

[0037] The working principle is as follows: First, the upper fixing seat 3 is slidably fitted onto the bottom end of the tool holder 1, and the upper fixing seat 3 is engaged with the outer side of the positioning ring 13 through the annular groove 14 at its top. The positioning ring 13 limits the upper fixing seat 3. Then, the blades 4 are placed into the lower fixing grooves 5 through the insertion plates 15. During placement, the insertion plates 15 are engaged with the lower fixing strip 6 through the fourth groove 18 on the lower side, and the blades 4 are placed against the side of the corresponding lower insertion plates 8. Then, the lower fixing seat 2 with the blades 4 is fitted onto the bottom end of the tool holder 1 through the fitting groove 22, and the positioning ribs 26 in the fitting groove 22 are engaged into the positioning rib grooves 25. The first positioning pin 24 is inserted into the first positioning hole 23 for limiting installation. The lower... When installing the fixing base 2, insert the upper side of the blade 4 located in the lower fixing groove 5 into the upper fixing groove 7, and position the upper fixing groove 7 on the side opposite to the blade 4 and the lower insert plate 8. Push the lower fixing base 2 upward, so that the lower insert plate 8 inserts upward into the corresponding upper fixing groove 7, and the upper insert plate 10 inserts into the corresponding lower fixing groove 5. At this time, the blade 4 will be locked onto the upper fixing strip 12 through the third slot 17 on the upper side of the insert plate 15, and the second slot 11 at the bottom of the upper insert plate 10 will be locked onto the lower fixing strip 6. The first slot 9 at the top of the lower insert plate 8 will be locked onto the upper fixing strip 12. At this time, under the pressure of the upper insert plate 10 and the lower insert plate 8 on both sides, and the lower fixing strip 6 and the upper... With the retaining clip 12 engaged, the blade 4 is simultaneously fixed in both the lower retaining groove 5 and the upper retaining groove 7. When the lower retaining seat 2 is pushed upward, the second positioning pin 28 will insert into the second positioning hole 27 to limit the installation of the lower retaining seat 2 and the upper retaining seat 3. Then, the hexagonal socket screw 21 is screwed through the through hole 19 into the threaded hole 20, and the screw head of the hexagonal socket screw 21 is screwed into the lower opening of the through hole 19. The lower retaining seat 2 is fixed to the bottom end of the tool holder 1 by the hexagonal socket screw 21, and the blade 4 is fixed between the lower retaining seat 2 and the upper retaining seat 3 for cutting and grooving. When the blade 4 is damaged or broken, the lower retaining seat 2 can be removed from the bottom end of the tool holder 1 by unscrewing the hexagonal socket screw 21 from the threaded hole 20. Remove the lower fixing seat 2 and separate it from the upper fixing seat 3. The upper side of the blade 4 will move out of the upper fixing groove 7, allowing the damaged blade 4 to be removed from the lower fixing groove 5 for replacement. After replacement, put the complete blade 4 back in, and then set the lower fixing seat 2 at the bottom of the tool holder 1 again, so that the blade 4 is reset in the lower fixing groove 5 and the upper fixing groove 7. At the same time, the No. 3 slot 17 and No. 4 slot 18 on the plug plate 15 are respectively locked onto the lower fixing clip 6 and the upper fixing clip 12. Then, screw the internal hexagon screw 21 back through the through hole 19 and into the threaded hole 20. This achieves the purpose of replacing the damaged blade individually, avoiding the need to replace the entire blade when it is damaged, which increases the processing cost. Compared with traditional dovetail milling cutters, this method is more convenient to use.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A dovetail end mill, characterized in that: Includes a tool holder (1); the bottom end of the tool holder (1) is provided with a lower fixing seat (2) and an upper fixing seat (3), the side curved surfaces of the lower fixing seat (2) and the upper fixing seat (3) are respectively provided with a plurality of lower fixing grooves (5) and upper fixing grooves (7), and the openings between the lower fixing grooves (5) and the upper fixing grooves (7) are respectively aligned, a lower fixing strip (6) is installed at the bottom of the lower fixing groove (5), and an upper fixing strip (12) is installed at the top of the upper fixing groove (7); The lower fixing groove (5) is equipped with a lower insert plate (8) at the upper opening, and the upper fixing groove (7) is equipped with an upper insert plate (10) at the lower opening. The upper insert plate (10) and the lower insert plate (8) are arranged opposite to each other. The upper insert plate (10) installed at the lower opening of the upper fixing groove (7) can be inserted into the corresponding lower fixing groove (5). The lower insert plate (8) installed at the upper opening of the lower fixing groove (5) can be inserted into the corresponding upper fixing groove (7). The lower fixing seat (2) and the upper fixing seat (3) are respectively provided with blades (4) in the corresponding lower fixing grooves (5) and upper fixing grooves (7). The lower insert plate (8) and the upper insert plate (10) are respectively attached to the upper and lower sides of the blade (4) and located on opposite sides of the blade (4). The blade (4) is composed of a connector plate (15) and a cutting edge (16). The connector plate (15) is simultaneously set in the corresponding lower fixing groove (5) and upper fixing groove (7). The connector plate (15) is provided with a third slot (17) for locking and limiting with the upper fixing strip (12), and the connector plate (15) is provided with a fourth slot (18) for locking and limiting with the lower fixing strip (6).

2. The dovetail end mill according to claim 1, characterized in that: A positioning ring (13) is installed on the tool holder (1), and the upper fixing seat (3) is slidably disposed at the bottom end of the tool holder (1) through the through groove (29), and an annular groove (14) is provided on the upper fixing seat (3) to fit into the positioning ring (13).

3. The dovetail end mill according to claim 1, characterized in that: The bottom end of the tool holder (1) is provided with a threaded hole (20), and the lower fixing seat (2) is provided with a fitting groove (22) that fits into the bottom end of the tool holder (1). The bottom of the lower fixing seat (2) is provided with a through hole (19) that communicates with the fitting groove (22). An internal hexagonal screw (21) is provided in the through hole (19), and the top end of the internal hexagonal screw (21) extends into the threaded hole (20).

4. A dovetail end mill according to claim 1, characterized in that: The top of the lower insert plate (8) is provided with a first slot (9) that fits into the upper fixing strip (12), and the bottom of the upper insert plate (10) is provided with a second slot (11) that fits into the lower fixing strip (6).

5. A dovetail end mill according to claim 1, characterized in that: The lower fixing strip (6) and the upper fixing strip (12) are installed in a staggered manner, and the third slot (17) and the fourth slot (18) are opened in a staggered manner.

6. A dovetail end mill according to claim 1, characterized in that: The bottom end of the tool bar (1) is symmetrically provided with two No. 1 positioning holes (23). The bottom of the fitting groove (22) of the lower fixing seat (2) is symmetrically provided with two No. 1 positioning pins (24) that are inserted into the No. 1 positioning holes (23). The bottom side of the tool bar (1) is symmetrically provided with two positioning rib grooves (25). The inner wall of the fitting groove (22) of the lower fixing seat (2) is symmetrically provided with two positioning ribs (26) that are used to lock and limit the positioning.

7. A dovetail end mill according to claim 1, characterized in that: The lower part of the upper fixing seat (3) is provided with two positioning holes (27) evenly distributed, and the two positioning holes (27) are staggered with the upper fixing groove (7). The upper part of the lower fixing seat (2) is provided with two positioning pins (28) that are inserted into the two positioning holes (27).

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