Split type indexable gear milling cutter

Abstract

The utility model discloses a split type indexable gear milling cutter. The utility model relates to a cylindrical gear machining tool. The problems that a traditional gear milling cutter blank is in a cake shape, a large amount of manpower, material resources and financial resources need to be consumed for machining, and raw materials can be effectively wasted due to the split type gear milling cutter are solved. The cutter body is of a circular structure, and the gear ring and the transmission positioning body are connected through the expandable key block and the expansion screw. The indexable gear milling cutter has the advantages that the defects of original cutter machining can be better overcome, materials are saved, materials with higher cost performance can be replaced when a transmission positioning part is installed, the machining performance of the indexable gear milling cutter is improved, the cost of the cutter body is saved, and resource waste is reduced.

Description

Technical Field

[0001] This utility model relates to gear machining tools, specifically to a split-type indexable gear milling cutter. Background Technology

[0002] Currently, traditional indexable gear end mills have a stepped circular shape and process forged solid disc-shaped blanks. The finished product has a flange connection diameter of D1 = φ180–200 mm, a cutter outer diameter of D2 = φ400–450 mm, a thickness of H = 90–120 mm, and a web thickness of h = 50–60 mm. The disc is machined into the desired shape, with the sides of the web being removed. Due to the relatively large machining diameter, this process is not only time-consuming, labor-intensive, and resource-intensive, but also hinders cost reduction and efficiency improvement. Therefore, there is a need to develop new indexable gear end mills with higher cost-effectiveness and material savings. Utility Model Content

[0003] To address the problem that existing indexable gear end mills remove most of the excess material during machining, resulting in long machining times and material waste, this invention provides a split-type indexable gear end mill. The technical solution to this problem is as follows:

[0004] This utility model of a split-type indexable gear end mill consists of a transmission positioning body, a gear ring, an expandable key block and a tightening screw. The cutter body has a circular structure, and the gear ring and the transmission positioning body are connected by the expandable key block and the tightening screw.

[0005] The transmission positioning body is composed of a transmission positioning rotary conical surface, four transmission positioning keyways, four transmission positioning threaded holes, and a through transmission positioning threaded hole. The half angle of the transmission positioning rotary conical surface is α1. The transmission positioning rotary conical surface, four transmission positioning keyways, four transmission positioning threaded holes, and four through threaded holes are all arranged on the transmission positioning body.

[0006] The gear ring consists of a gear ring rotary cone surface, four gear ring cone surface keyways, and four gear ring cone surface threaded holes. The half angle of the gear ring positioning rotary cone surface is α2. The four gear ring cone surface keyways and four gear ring cone surface threaded holes are provided on the gear ring. When the gear ring and the transmission positioning body are engaged, they correspond to the four transmission positioning keyways and the four gear ring cone surface keyways.

[0007] The expandable key block is composed of an expandable key block conical hole, an expandable key block groove, and a clearance groove S. The expandable key block is placed in the four transmission positioning keyways in the corresponding transmission positioning rotary conical surface and the gear ring conical surface keyway in the gear ring rotary conical surface. The expandable key block has a cone angle β1, and the clearance groove S is located above and below the middle of the expandable key block.

[0008] The expansion screw is composed of an expansion screw cone and an expansion screw thread. The expansion screw cone is located above the expansion screw thread. The expansion screw has a cone angle β2. The expansion screw cone surface of the expansion screw mates with the expandable key block cone hole of the expandable key block.

[0009] This utility model discloses a split-type indexable gear end mill, applicable to high-speed gear milling machines or gear hobbing machines. The cutter body, transmission positioning body, and gear ring are designed separately. After being clamped using specialized installation and disassembly tools, an expandable key block is placed into the corresponding keyway. An expansion screw is screwed into the transmission positioning body and gear ring through a threaded hole. The taper of the expansion screw matches the taper of the expandable key block. Tightening the screw further expands the expandable key block, eliminating the gap between the keyway and the key block. The taper of the transmission positioning body and the taper of the gear ring are self-locking, and the connection between the keyway and the expandable key block further strengthens the connection. This combination allows the transmission positioning body and gear ring to form a robust split-type indexable gear end mill. It better compensates for the shortcomings of traditional cutting tools, saves materials, and addresses the issue of wasted raw materials. The blank material is a forged circular solid material with a thickness of h=90~120mm at the center web, while the thickness of the center web after machining is only h=50~60mm, wasting approximately 30% of the raw material. By using a split-type indexable gear end mill and installing a transmission positioning body, more cost-effective raw materials can be used, which improves the machining performance of the indexable gear end mill and saves on the cost of the indexable gear end mill. Attached Figure Description

[0010] Figure 1 This is a front view of the split-type indexable gear milling cutter of this utility model. Figure 2 yes Figure 1 The right view, Figure 3 This is the front view of the tooth-shaped body. Figure 4 yes Figure 3 Right sectional view, Figure 5 This is the front view of the transmission positioning body. Figure 6 yes Figure 5 The right view, Figure 7 This is the main view of the expandable key block. Figure 8 yes Figure 7 Right view, Figure 9 yes Figure 7 The bottom view, Figure 10 This is the front view of the expansion bolt. Figure 11 yes Figure 10 Top view, Figure 12 This is a schematic diagram of the blank and the tool body. Figure 13 This is the main view of the installation and removal tools. Figure 14 for Figure 13 The right view. Detailed Implementation

[0011] Specific implementation method one: Combining Figures 1 to 14This embodiment is described. This embodiment consists of a transmission positioning body 1, a gear ring 2, an expandable key block 3, and a tightening screw 4. The cutter body has a circular structure, and the gear ring 2 and the transmission positioning body 1 are connected by the expandable key block 3 and the tightening screw 4.

[0012] The transmission positioning body 1 consists of a transmission positioning rotary conical surface 1-1, four transmission positioning keyways 1-2, four transmission positioning threaded holes 1-3, and a through transmission positioning threaded hole 1-4. The half angle of the transmission positioning rotary conical surface 1-1 is α. １ The transmission positioning rotary cone surface 1-1, four transmission positioning keyways 1-2, four transmission positioning threaded holes 1-3 and four through threaded holes 1-4 are all arranged on the transmission positioning body 1.

[0013] The gear ring 2 is composed of a gear ring rotary cone surface 2-1, four gear ring cone surface keyways 2-2, and four gear ring cone surface threaded holes 2-3. The half angle of the gear ring positioning rotary cone surface 2-1 is α. ２ Four conical keyways 2-2 and four conical threaded holes 2-3 are provided on the gear ring 2. When the gear ring 2 and the transmission positioning body 1 are engaged, they correspond to the four transmission positioning keyways 1-2 and the four conical keyways 2-2.

[0014] The expandable key block 3 is composed of an expandable key block conical hole 3-1, an expandable key block groove 3-2, and a clearance groove S. The expandable key block 3 is placed in the four transmission positioning keyways 1-2 in the corresponding transmission positioning rotary conical surface 1-1 and the gear ring conical surface keyway 2-2 in the gear ring rotary conical surface 2-1. The expandable key block 3 is provided with a cone angle β1, and the clearance groove S is provided above and below the middle of the expandable key block 3.

[0015] The expansion screw 4 is composed of an expansion screw cone 4-1 and an expansion screw thread 4-2. The expansion screw cone 4-1 is located above the expansion screw thread 4-2. The expansion screw 4 has a cone angle β2. The expansion screw cone surface 4-1 of the expansion screw 4 is engaged with the expandable key block cone hole 3-1 of the expandable key block 3.

[0016] Specific Implementation Method Two: Combining Figures 1 to 6 This embodiment describes the transmission positioning body 1 and the gear ring 2 as described in this embodiment, which are connected by a tapered self-locking connection. The half-angle of the gear ring positioning rotary cone surface 2-1 is α2, and the half-angle of the transmission positioning rotary cone surface 1-1 is α1. Both the half-angles of α1 and α2 are 3 to 8 degrees.

[0017] Specific implementation method three: Combining Figures 1 to 6 This embodiment describes the following. The cone angle β1 of the expandable key block 3 and the cone angle β2 of the tightening screw 4 described in this embodiment are β1=β2, and the angle range of β1 and β2 is 3 to 10 degrees.

[0018] Specific implementation method four: Combination Figures 1 to 14This embodiment describes the expansion groove width B of the expandable key block 3 described in this embodiment, which is 0.5 to 1 mm and the length L is 1 to 2 mm.

[0019] Specific Implementation Method Five: Combining Figures and... Figure 6 This embodiment describes the following. The gap between the expandable key block 3 and the keyway 1-2 of the transmission positioning body and the keyway 2-2 of the gear ring described in this embodiment is 0.1–0.2 mm.

[0020] Specific Implementation Method Six: Combination Figures 1 to 11 This embodiment describes an indexable gear end mill. The indexable gear end mill described in this embodiment is suitable for machining gears with a module of 2.5 to 20.

[0021] Specific implementation method seven: Combining Figures 1 to 14 This embodiment describes the transmission positioning body 1 and the gear ring 2 described in this embodiment. These components can be optimized using two different materials, resulting in a higher cost-performance ratio.

[0022] Specific implementation method eight: Combination Figure 6 This embodiment describes the following. The outer diameter of the transmission positioning body 1 described in this embodiment is D3 = φ260~270mm. Special tools are used for disassembly and installation. Figure 13 and Figure 14 .

[0023] Specific Implementation Method Nine: Combining Figures 1 to 6 This embodiment describes the transmission positioning body 1, which is made of round bar forging or bar stock, and the gear ring 2 is made of ring forging, thus saving material. The mounting part is made of round bar stock with a diameter of 260-270mm, and the gear ring part is forged into ring forging with an inner hole of 250-260mm, an outer diameter of 400-450mm, and a thickness of 50-60mm. This saves the cost of the large outer diameter material of the gear part, including the cost of material that would otherwise need to be machined, tool cost, labor cost, and machine tool cost.

[0024] When installing the expansion screw 4, including its expansion screw cone 4-1 and expansion screw thread 4-2, the gear ring 2, and the transmission positioning body 1, the four keyways of the gear ring 2 and the transmission positioning body 1 correspond to each other. After being tightened using a special installation and disassembly tool 5, the expandable key block 3 is placed into the corresponding keyways of the four transmission positioning keyways 1-2 and the gear ring cone surface keyway 2-2 of the gear ring cone surface 2-1. The expansion screw 4 is then tightened and expanded through the transmission positioning threaded hole 1-3, eliminating the gap between the transmission positioning keyways 1-2 and the four gear ring cone surface keyways 2-2 and the expandable key block 3. The connection between the transmission positioning cone surface 1-1 of the transmission positioning body 1 and the gear ring cone surface 2-1 of the toothed part 2 can be self-locking. The connection between the transmission positioning keyways 1-2 and the four gear ring cone surface keyways 2-2 and the expandable key block 3 further strengthens the connection. Through this cooperation, the transmission positioning body 1 and the gear ring 2 constitute a robust split-type indexable gear end mill.

[0025] Specific Implementation Method Ten: Combining Figure 6 This embodiment describes the special tools used for disassembly and installation as described in this embodiment. Figure 13 and Figure 14 .

[0026] The above embodiments are merely exemplary and are not limited to this utility model. It should be noted that for those skilled in the art, any other equivalent changes, modifications, substitutions and variations made under the guidance of the technical solutions provided by this utility model should be considered within the protection scope of this utility model.

Claims

1. A split-type indexable gear end mill, comprising a transmission positioning body, a gear ring, an expandable key block, and an expansion screw, characterized in that: The cutter body has a circular structure, and the gear ring and transmission positioning body are connected by an expandable key block and a tightening screw. The transmission positioning body is composed of a transmission positioning rotary conical surface, four transmission positioning keyways, four transmission positioning threaded holes, and a through transmission positioning threaded hole. The half angle of the transmission positioning rotary conical surface is α1. The transmission positioning rotary conical surface, four transmission positioning keyways, four transmission positioning threaded holes, and four through threaded holes are all arranged on the transmission positioning body. The gear ring consists of a gear ring rotary cone surface, four gear ring cone surface keyways, and four gear ring cone surface threaded holes. The half angle of the gear ring positioning rotary cone surface is α2. The four gear ring cone surface keyways and four gear ring cone surface threaded holes are provided on the gear ring. When the gear ring and the transmission positioning body are engaged, they correspond to the four transmission positioning keyways and the four gear ring cone surface keyways. The expandable key block is composed of an expandable key block conical hole, an expandable key block groove, and a clearance groove S. The expandable key block is placed in the four transmission positioning keyways in the corresponding transmission positioning rotary conical surface and the gear ring conical surface keyway in the gear ring rotary conical surface. The expandable key block has a cone angle β1, and the clearance groove S is located above and below the middle of the expandable key block. The expansion screw is composed of an expansion screw cone and an expansion screw thread. The expansion screw cone is located above the expansion screw thread. The expansion screw has a cone angle β2. The expansion screw cone surface of the expansion screw mates with the expandable key block cone hole of the expandable key block.

2. The split-type indexable gear end mill according to claim 1, characterized in that: The transmission positioning body and the gear ring are connected by a tapered self-locking link.

3. The split-type indexable gear end mill according to claim 1, characterized in that: The half-angle of the transmission positioning rotary cone is α1, and the half-angle of the gear ring positioning rotary cone is α2. Both α1 and α2 are 3 to 8 degrees.

4. The split-type indexable gear end mill according to claim 1, characterized in that: The cone angle β1 of the expandable key block and the cone angle β2 of the tightening screw are β1=β2, and the angle range of β1 and β2 is 3 to 10 degrees.

5. The split-type indexable gear end mill according to claim 1, characterized in that: The expansion groove width B of the expandable key block is 0.5-1mm, and the length L is 1-2mm.

6. The split-type indexable gear end mill according to claim 1, characterized in that: The gap between the expandable key block and the keyway of the transmission positioning body and the keyway of the gear ring is 0.1 to 0.2 mm.

7. The split-type indexable gear end mill according to claim 1, characterized in that: The indexable gear end mill is suitable for gears with a module of 2.5 to 20.

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