Gear milling cutter with easy replacement

Abstract

The utility model discloses a gear milling cutter convenient to replace applied to gear milling cutter field, through the positioning pin to the milling cutter body carries out the circumferential positioning, simultaneously, through the both ends of the connecting block along the axis direction of the tool bar all are provided with the protruding part, when will lock the fastening spare and insert the tool bar, lock the fastening spare and the outer surface of connecting block abut tightly, make connecting block fixed in the inside of tool shaft unit, at this moment, the protruding part of connecting block both ends respectively overlap in the both sides outer end face of disc -shaped cutter body, thereby to disc -shaped cutter body play the role of axial positioning, make the connection stability of tool shaft unit and milling cutter body better, in addition, through the rotary installation rod, will lock the fastening spare from tool shaft unit and extract, again push connecting block to the tool bar axis direction, make connecting block and limit groove separate, can carry out the disassembly to the milling cutter body, convenient to replace the disassembly milling cutter body, and simultaneously do not need the additional groove in the inside of milling cutter body, is favorable for reducing the processing cost.

Description

Technical Field

[0001] This utility model relates to the field of gear milling cutters, and in particular to a gear milling cutter that is easy to replace. Background Technology

[0002] A gear end mill is a forming tool used to machine the tooth profile of a gear. Its tooth profile matches the groove profile of the gear being machined. The gear end mill is mounted on the spindle of a milling machine via a tool holder. After the milling machine is started, the end mill will rotate at high speed and continuously. At the same time, the worktable that holds the workpiece will move the gear blank in the longitudinal or vertical direction, so that the gear blank gradually approaches and cuts into the end mill. The gear end mill cuts the gear blank to form the tooth groove.

[0003] Traditional disc gear end mills often use bolts or threaded rods to directly press the end mill onto the end face of the shank. This makes it difficult for operators to quickly install or remove the gear end mill, affecting processing efficiency. A utility model patent (Chinese Patent Publication No. CN220278487U) discloses an easy-to-replace automotive gear end mill. Through its installation mechanism, operators simply place the chuck inside the top of the protrusion and then rotate the threaded rod to install it inside the top of the mounting shaft to complete the installation of the gear end mill body. Similarly, when disassembling the gear end mill body, operators only need to rotate the torsion block to disassemble the threaded rod and then move the chuck upwards to complete the disassembly. This simple operation makes it easy for operators to use and solves the problem of difficult replacement.

[0004] However, existing disc gear end mills achieve quick connection with the tool holder by creating an additional slot inside the positioning groove. Since gear end mills are frequently replaced connecting parts and are used in large quantities, while tool holders are fixed parts and are used in fewer quantities, achieving quick connection by creating an additional slot inside the gear end mill requires grooving on each gear end mill, which greatly increases processing costs and is not conducive to cost control. Therefore, we propose a gear end mill that is easy to replace in order to solve the above problems. Utility Model Content

[0005] The core of this invention lies in the use of a movable connecting block inside the cutter shaft unit to provide axial positioning for the milling cutter body. This ensures easy separation of the cutter shaft unit and the milling cutter body without requiring additional machining of the milling cutter body, thus improving cost control. It also solves the problem of existing technologies that rely on additional slotting inside gear milling cutters for quick connection, which requires slotting on each cutter and significantly increases processing costs. Furthermore, it enhances the connection stability between the cutter shaft unit and the milling cutter body.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A replaceable gear end mill includes a cutter shaft unit and an end mill body connected to the outside of the cutter shaft unit. The cutter shaft unit includes a cutter shank and a first keyway formed on the outer surface of the cutter shank. The cutter shank has a second mounting hole and a first mounting hole inside, both of which are coaxially arranged with the cutter shank. A limiting groove is also formed inside the first mounting hole, which is located outside the first mounting hole. The end mill body includes a disc-shaped cutter body and a central hole formed inside the disc-shaped cutter body. The disc-shaped cutter body is coaxially arranged with the central hole. A second keyway connected to the central hole is also formed inside the disc-shaped cutter body. A positioning pin is provided on the inner side of the first keyway, and the positioning pin is engaged with the disc-shaped cutter body through the second keyway. A connecting block is provided on the inner side of the limiting groove. Both ends of the connecting block along the axis of the cutter bar are provided with protrusions, and the protrusions overlap the outer end faces of both sides of the disc-shaped cutter body. The positioning pin is located on the inner side of the protrusions at both ends of the connecting block. A locking component is also connected inside the cutter shaft unit. The locking component includes a mounting rod and a connecting rod fixedly connected to the end of the mounting rod facing the inside of the cutter bar. The mounting rod is connected to the cutter bar through the first mounting hole, and the connecting rod is connected to the cutter bar through the second mounting hole.

[0008] In an exemplary embodiment, the mounting rod is rotatably connected to the tool bar through the first mounting hole, and a groove structure is provided on the end face of the mounting rod opposite to the connecting rod.

[0009] In an exemplary embodiment, the outer surface of the connecting block facing the axis of the tool holder is arc-shaped, and the arc-shaped outer surface abuts against the outer surface of the mounting rod.

[0010] In an exemplary embodiment, the outer surface of the connecting rod is fixedly provided with a convex thread structure, and the inner surface of the second mounting hole is provided with a concave thread structure that mates with the connecting rod. The connecting rod and the tool bar are connected by a thread through the second mounting hole.

[0011] In an exemplary embodiment, the connecting block and the tool bar form a sliding insertion connection through a limiting groove.

[0012] As another improvement of this application, the tool holder and the first keyway are both opened at equal angles about the axis of the tool holder, and the positioning pin and the connecting block are also set at equal angles about the axis of the tool holder, and the positioning pin and the connecting block are set in a one-to-one correspondence.

[0013] As a further improvement to this application, the second keyway is opened at an angle to the axis of the disc-shaped tool body, and the second keyway is configured to cooperate with the positioning pin.

[0014] Compared with existing technologies, the advantages of this utility model are: 1. This solution uses a rotating mounting rod to separate the connecting rod from the second mounting hole, pulls the locking component out of the cutter shaft unit, and then pushes the connecting block towards the axis of the cutter bar to separate the connecting block from the limiting groove. This allows the milling cutter body to be disassembled, facilitating the replacement and disassembly of the milling cutter body. At the same time, it eliminates the need for additional grooving inside the milling cutter body, which helps reduce processing costs.

[0015] 2. This solution uses locating pins to circumferentially position the milling cutter body. Since the connecting block has protrusions at both ends along the tool shank axis, and the locating pins are located inside the protrusions at both ends of the connecting block, the mounting rod is inserted into the tool shank through the first mounting hole. Rotating the mounting rod allows the connecting rod to be threaded into the tool shank through the second mounting hole, and the arc-shaped outer surface of the connecting block abuts against the outer surface of the mounting rod. The locking element then tightens the connecting block, fixing it inside the tool shaft unit. At this point, the protrusions at both ends of the connecting block overlap the outer end faces of the disc-shaped cutter body, thus providing axial positioning for the disc-shaped cutter body and simultaneously providing circumferential and axial positioning for the milling cutter body, resulting in better connection stability. Attached Figure Description

[0016] Figure 1 This is an exploded structural diagram of the first embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the overall cross-sectional structure of the first embodiment of this utility model; Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the cutter shaft unit in the cutting state in the first embodiment of this utility model; Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the cutter shaft unit and the milling cutter body in the second embodiment of this utility model; Figure 8 This is an exploded structural diagram of the second embodiment of the present invention.

[0017] Explanation of the labels in the diagram: 1. Cutter shaft unit; 101. Cutter shank; 102. First keyway; 103. Limiting groove; 104. First mounting hole; 105. Second mounting hole; 2. Milling cutter body; 201. Disc-shaped cutter body; 202. Center hole; 203. Second keyway; 3. Locating pin; 4. Connecting block; 5. Locking component; 501. Mounting rod; 502. Connecting rod. Detailed Implementation

[0018] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0019] First implementation method: Please see Figure 1 and Figure 2 As shown, a replaceable gear end mill includes a cutter shaft unit 1 and an end mill body 2 connected to the outside of the cutter shaft unit 1. The cutter shaft unit 1 includes a cutter shank 101 and a first keyway 102 formed on the outer surface of the cutter shank 101. The cutter shank 101 has a second mounting hole 105 and a first mounting hole 104 inside. Figure 1 and Figure 5 As shown, the first mounting hole 104 and the second mounting hole 105 are both coaxially arranged with the tool holder 101. A limiting groove 103 is also provided inside the first mounting hole 104. The limiting groove 103 is connected to the outside of the first mounting hole 104. A positioning pin 3 is provided on the inside of the first keyway 102. A connecting block 4 is provided on the inside of the limiting groove 103. Specific examples Figure 1 As shown, the milling cutter body 2 includes a disc-shaped cutter body 201 and a central hole 202 formed inside the disc-shaped cutter body 201. The disc-shaped cutter body 201 and the central hole 202 are coaxially arranged. A second keyway 203 connected to the central hole 202 is also formed inside the disc-shaped cutter body 201. Figure 3 and Figure 4 As shown, the positioning pin 3 is engaged with the disc-shaped cutter body 201 through the second keyway 203. When the cutter shaft unit 1 is connected to the milling cutter body 2, the positioning pin 3 plays a circumferential positioning role for the milling cutter body 2. At the same time, the connecting block 4 is provided with protrusions at both ends along the axis of the cutter bar 101, and the positioning pin 3 is located on the inner side of the protrusions at both ends of the connecting block 4. When the cutter shaft unit 1 is connected to the milling cutter body 2, the protrusions at both ends of the connecting block 4 overlap the outer end faces of both sides of the disc-shaped cutter body 201, playing an axial positioning role for the disc-shaped cutter body 201. Furthermore, a locking component 5 is also connected inside the cutter shaft unit 1. The locking component 5 includes a mounting rod 501 and a connecting rod 502 fixedly connected to one end of the mounting rod 501 facing the inside of the cutter bar 101. The mounting rod 501 is connected to the cutter bar 101 through a first mounting hole 104, and the connecting rod 502 is connected to the cutter bar 101 through a second mounting hole 105, as detailed below. Figure 1 and Figure 5As shown, the mounting rod 501 can rotate inside the tool bar 101 through the first mounting hole 104, and the mounting rod 501 has a groove structure on the end face opposite to the connecting rod 502. At the same time, the outer surface of the connecting rod 502 is fixedly provided with a convex thread structure, and the inner surface of the second mounting hole 105 is provided with a concave thread structure that cooperates with the connecting rod 502. When the locking member 5 is connected to the tool shaft unit 1, the mounting rod 501 is rotated so that the connecting rod 502 forms a threaded connection with the tool bar 101 through the second mounting hole 105, thereby allowing the locking member 5 to be inserted into the tool shaft unit 1. Furthermore, the outer surface of the connecting block 4 facing the axis of the tool holder 101 is arc-shaped. Simultaneously, the connecting block 4 forms a sliding engagement connection with the tool holder 101 via the limiting groove 103, specifically as follows... Figure 4 As shown, when the locking member 5 is inserted into the cutter shaft unit 1, the arc-shaped outer surface of the connecting block 4 abuts against the outer surface of the mounting rod 501, and the locking member 5 presses the connecting block 4 against it, so that the connecting block 4 is fixed inside the cutter shaft unit 1. Working principle: When using this easily replaceable gear end mill, firstly, the connecting block 4 is placed into the cutter shaft unit 1, and then the locating pin 3 is embedded into the outer surface of the cutter shank 101 through the first keyway 102, and then... Figure 1 and Figure 2 As shown, the disc-shaped cutter body 201 is sleeved on the outside of the cutter bar 101 through the center hole 202, and then the disc-shaped cutter body 201 is moved circumferentially along the cutter bar 101 so that the positioning pin 3 is engaged with the disc-shaped cutter body 201 through the second keyway 203, and then the milling cutter body 2 is circumferentially positioned by the positioning pin 3. Specific examples Figure 3 and Figure 4 As shown, since both ends of the connecting block 4 along the axial direction of the tool bar 101 are provided with protrusions, and the positioning pin 3 is located on the inner side of the protrusions at both ends of the connecting block 4, the mounting rod 501 is inserted into the tool bar 101 through the first mounting hole 104, and the mounting rod 501 is rotated so that the connecting rod 502 is threadedly connected to the tool bar 101 through the second mounting hole 105, and the arc-shaped outer surface of the connecting block 4 abuts against the outer surface of the mounting rod 501. The locking member 5 is used to tighten the connecting block 4, so that the connecting block 4 is fixed inside the tool shaft unit 1. At this time, the protrusions at both ends of the connecting block 4 overlap the outer end faces of the two sides of the disc-shaped tool body 201, thereby playing an axial positioning role for the disc-shaped tool body 201. Specific examples Figure 1 and Figure 3As shown, when the milling cutter body 2 needs to be replaced, the mounting rod 501 is rotated in the opposite direction to separate the connecting rod 502 from the second mounting hole 105, and the locking member 5 is pulled out from the cutter shaft unit 1. After the locking member 5 is separated from the cutter shaft unit 1, the connecting block 4 can move in the cutter shaft unit 1. The connecting block 4 is pushed in the direction of the axis of the cutter bar 101 to separate the connecting block 4 from the limiting groove 103, and the connecting block 4 can be pulled out from the cutter shaft unit 1. At this time, the milling cutter body 2 can be disassembled.

[0020] Second implementation method: Please see Figure 1 As shown in the diagram, based on the first embodiment, in this embodiment, both the tool holder 101 and the first keyway 102 are formed at equal angles about the axis of the tool holder 101. Figure 6 and Figure 8 As shown, the locating pin 3 and the connecting block 4 are also set at equal angles about the axis of the tool holder 101, and the locating pin 3 and the connecting block 4 are set in a one-to-one correspondence. Figure 6 and Figure 7 As shown, the second keyway 203 is opened at the same angle about the axis of the disc-shaped cutter body 201, and the second keyway 203 is configured to cooperate with the positioning pin 3; Specific examples Figure 6 As shown in the figure, in this embodiment, the positioning pins 3 and connecting blocks 4 are evenly arranged along the connecting circumferential surface of the cutter shaft unit 1 and the milling cutter body 2, which can make the load distribution more uniform, reduce stress concentration, improve the uniformity of force, thereby improving the torsion transmission capacity and fatigue life, and further improving the connection performance.

[0021] The above are merely preferred embodiments of this utility model; they encompass all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A replaceable gear end mill, comprising a cutter shaft unit (1) and an end mill body (2) connected to the outside of the cutter shaft unit (1), characterized in that: The cutter shaft unit (1) includes a cutter bar (101) and a first keyway (102) formed on the outer surface of the cutter bar (101). The cutter bar (101) has a second mounting hole (105) and a first mounting hole (104) inside. The first mounting hole (104) and the second mounting hole (105) are both coaxially arranged with the cutter bar (101). The first mounting hole (104) also has a limiting groove (103) inside. The limiting groove (103) is formed on the outside of the first mounting hole (104). The milling cutter body (2) includes a disc-shaped cutter body (201) and a central hole (202) formed inside the disc-shaped cutter body (201). The disc-shaped cutter body (201) is coaxially arranged with the central hole (202). The disc-shaped cutter body (201) also has a second keyway (203) connected to the central hole (202) inside. A positioning pin (3) is provided on the inner side of the first keyway (102), and the positioning pin (3) is engaged with the disc-shaped cutter body (201) through the second keyway (203). A connecting block (4) is provided on the inner side of the limiting groove (103). The connecting block (4) has protrusions at both ends along the axis of the cutter bar (101), and the protrusions overlap the outer end faces of the two sides of the disc-shaped cutter body (201). The positioning pin (3) is provided on both sides of the connecting block (4). Inside the end protrusion, the cutter shaft unit (1) is also connected to a locking member (5). The locking member (5) includes a mounting rod (501) and a connecting rod (502) fixedly connected to one end of the mounting rod (501) facing the inside of the cutter bar (101). The mounting rod (501) is connected to the cutter bar (101) through a first mounting hole (104), and the connecting rod (502) is connected to the cutter bar (101) through a second mounting hole (105).

2. The easily replaceable gear end mill according to claim 1, characterized in that: The mounting rod (501) is rotatably connected to the tool bar (101) through the first mounting hole (104), and a groove structure is provided on the end face of the mounting rod (501) facing away from the connecting rod (502).

3. The easily replaceable gear end mill according to claim 2, characterized in that: The outer surface of the connecting block (4) facing the axis of the tool bar (101) is arc-shaped, and the arc-shaped outer surface abuts against the outer surface of the mounting rod (501).

4. The easily replaceable gear end mill according to claim 3, characterized in that: The outer surface of the connecting rod (502) is fixedly provided with a convex thread structure, and the inner surface of the second mounting hole (105) is provided with a concave thread structure that cooperates with the connecting rod (502). The connecting rod (502) and the tool bar (101) are connected by a thread through the second mounting hole (105).

5. The easily replaceable gear end mill according to claim 4, characterized in that: The connecting block (4) is connected to the knife bar (101) by means of a limiting groove (103) in a sliding insertion connection.

6. The easily replaceable gear end mill according to claim 5, characterized in that: The tool holder (101) and the first keyway (102) are both opened at equal angles about the axis of the tool holder (101). The positioning pin (3) and the connecting block (4) are also set at equal angles about the axis of the tool holder (101), and the positioning pin (3) and the connecting block (4) are set in a one-to-one correspondence.

7. A replaceable gear end mill according to claim 6, characterized in that: The second keyway (203) is opened at the same angle as the axis of the disc-shaped cutter body (201), and the second keyway (203) is configured to cooperate with the positioning pin (3).

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