Multi-angle rotary milling head

Abstract

This utility model relates to the field of milling machine processing technology and discloses a multi-angle rotating milling head, including a spindle connected to the milling machine to realize the milling work of the milling head. The spindle includes a columnar support cylinder with multiple positioning grooves evenly formed circumferentially inside the support cylinder. The support cylinder is integrally formed from high-strength aluminum alloy material with a tensile strength of not less than 500MPa and a yield strength of not less than 450MPa. A reinforcing mechanism is detachably assembled inside the spindle. The reinforcing mechanism includes a central connecting column, and multiple curved panels are embedded and fixedly arranged circumferentially on the outer surface of the connecting column. The multiple curved panels are distributed at a 120° angle to each other. This utility model uses high-quality materials and a reasonable structure, resulting in high strength, light weight, stable multi-angle operation, convenient disassembly and maintenance, reduced costs, and improved component recycling rate and equipment service life.

Description

Technical Field

[0001] This utility model relates to the field of milling machine processing technology, and in particular to a multi-angle rotating milling head. Background Technology

[0002] In the field of milling, multi-angle rotary milling heads are widely used in milling complex workpieces because they can perform multi-directional machining operations. Among them, the spindle, as the core load-bearing component of the milling head, must simultaneously withstand the radial cutting force and axial pressure during the milling process. Moreover, when adjusting the spindle at multiple angles, the stress state of various parts of the spindle will change dynamically, which can easily lead to local stress concentration. Currently, most milling head spindles on the market are made of integral high-strength steel to ensure sufficient strength to resist deformation and fracture. While such spindles can meet basic strength requirements, the high density of the steel results in a relatively high overall weight. This not only increases the load on the milling head's rotary drive mechanism and reduces the flexibility and response speed of angle adjustment, but also accelerates the wear of drive components and shortens the overall service life of the milling head during long-term, high-frequency angle switching. Some manufacturers have attempted to use lightweight materials to manufacture spindles, but due to insufficient material strength or unreasonable structural design, the spindles are still prone to bending deformation or even fracture when subjected to large cutting forces. This makes it impossible to reliably guarantee milling accuracy and operational safety, and it is difficult to balance the high strength performance and lightweight requirements of the spindle.

[0003] Therefore, those skilled in the art have provided a multi-angle rotating milling head to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-angle rotating milling head for milling machines. It uses high-quality materials and a reasonable structure, resulting in high strength, light weight, stable operation at multiple angles, and convenient disassembly and maintenance. This reduces costs and improves the recycling rate of components and the service life of equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-angle rotating milling head, comprising: A spindle, which is connected to a milling machine to realize the milling work of the milling head, the spindle includes a columnar support cylinder, and multiple positioning grooves are evenly opened in the circumferential direction inside the support cylinder. The support cylinder is integrally formed of high-strength aluminum alloy material, and the tensile strength of the high-strength aluminum alloy material is not less than 500MPa and the yield strength is not less than 450MPa. A reinforcing mechanism is detachably assembled inside the main shaft. The reinforcing mechanism includes a central connecting column. Multiple curved panels are embedded and fixedly arranged circumferentially on the outer surface of the connecting column. The multiple curved panels are distributed at a 120° angle with each other, and the two ends of each curved panel are slidably engaged in the corresponding positioning groove. The multiple curved panels are supported by the inner wall of the support cylinder. The curved panels are made of carbon fiber reinforced composite material, and the carbon fiber volume fraction in the carbon fiber reinforced composite material is 60%-70%.

[0006] Furthermore, a plurality of connecting blocks are uniformly fixedly arranged circumferentially near the lower end of the support cylinder, and a connecting shaft is fixedly inserted through the center of the plurality of connecting blocks. The connecting shaft is coaxially arranged with the support cylinder and is made of titanium alloy.

[0007] Furthermore, a reinforcing layer is fixedly sleeved inside the connecting column along the axial direction. The material of the reinforcing layer is silicon carbide ceramic, the thickness of the reinforcing layer is 3-5mm, and its inner wall is provided with anti-slip texture.

[0008] Furthermore, a support layer is fixedly sleeved inside the reinforcing layer along the axial direction. The support layer is made of high-strength engineering plastic, specifically polyetheretherketone (PEEK). The inner wall of the support layer slides in fit with the outer wall of the connecting shaft. A wear-resistant coating is provided between the support layer and the connecting shaft, with a thickness of 0.5-1 mm.

[0009] Furthermore, a milling head body is fixedly installed at the lower end of the spindle, and a sealing cover is snapped onto the upper end of the spindle via a snap-fit ​​structure. An elastic sealing gasket is provided inside the sealing cover, and the elastic sealing gasket is tightly fitted to the upper end face of the support cylinder.

[0010] Furthermore, the upper end of the connecting column extends to the upper opening of the support cylinder, and the upper end of the connecting column is provided with a groove. The reinforcing mechanism can be driven to be removed from the inside of the main shaft by a tool, so as to realize the separate and cyclical use of the reinforcing mechanism and the main shaft.

[0011] This utility model has the following beneficial effects: 1. This utility model proposes a multi-angle rotating milling head. The spindle is reinforced by an integrally formed support cylinder made of high-strength aluminum alloy and a curved plate made of carbon fiber reinforced composite material. While ensuring that the tensile strength of the support cylinder is not less than 500MPa and the yield strength is not less than 450MPa, the low-density characteristics of the carbon fiber reinforced composite material significantly reduce the overall weight of the spindle. The close fit between the curved plate and the inner wall of the support cylinder evenly distributes the stress generated during milling to various areas of the support cylinder, reducing local stress concentration and effectively preventing deformation and fracture of the spindle during multi-angle operation. This achieves a synergistic optimization of high strength and lightweight design for the spindle, improving the flexibility of the milling head's angle adjustment and its long-term operational stability.

[0012] 2. This utility model proposes a multi-angle rotating milling head. The reinforcing mechanism, through the sliding fit between the two ends of the curved panel and the positioning groove of the support cylinder, and the design of the internal hexagonal groove at the upper end of the connecting column, allows the reinforcing mechanism to be driven out of the spindle as a whole by an internal hexagonal tool, realizing the separation and disassembly of the reinforcing mechanism from the spindle. At the same time, the lower end of the spindle is detachably connected to the milling head body through a flange. When the spindle or some parts of the reinforcing mechanism are worn, the damaged parts can be replaced or repaired separately without replacing the entire milling head, reducing equipment maintenance costs, extending the cycle of use of the spindle and the reinforcing mechanism, and improving resource utilization. Attached Figure Description

[0013] Figure 1 This is an exploded view of the present invention; Figure 2 This is an axonometric view of the present invention; Figure 3 This is a side view of the spindle of this utility model; Figure 4 This is an isometric view of the reinforcing mechanism of this utility model.

[0014] Legend: 1. Milling head body; 2. Spindle; 3. Sealing cover; 4. Reinforcing mechanism; 201. Main support cylinder; 202. Connecting shaft; 203. Connecting block; 204. Positioning groove; 401. Curved panel; 402. Connecting column; 403. Reinforcing layer; 404. Support layer. Detailed Implementation

[0015] 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 protection scope of the present utility model.

[0016] Reference Figure 1-4 One embodiment provided by this utility model: A multi-angle rotating milling head, comprising: The spindle 2 is connected to the milling machine to realize the milling work of the milling head. The spindle 2 includes a columnar support cylinder 201. Multiple positioning grooves 204 are evenly opened in the circumferential direction inside the support cylinder 201. The support cylinder 201 is integrally formed of high-strength aluminum alloy material. The tensile strength of the high-strength aluminum alloy material is not less than 500MPa and the yield strength is not less than 450MPa. Specifically, the outer diameter of the support cylinder 201 is set to 80-100mm, the inner diameter to 60-80mm, and the length to 200-250mm. Three positioning grooves 204 are evenly distributed along the circumference of its inner wall. Each positioning groove 204 has a rectangular cross-section, a groove width of 8-10mm, a groove depth of 5-7mm, and a groove length consistent with the length of the support cylinder 201. The use of high-strength aluminum alloy in a single molding process reduces the splicing gaps of the support cylinder 201, avoiding stress concentration points. Furthermore, the density of aluminum alloy is only about 1 / 3 that of steel, reducing the base weight of the main shaft 2 while meeting tensile strength and yield strength requirements. This provides reasonable space for the subsequent assembly of the reinforcing mechanism 4. The single molding process also ensures the uniformity of the wall thickness of the support cylinder 201, ensuring balanced force in all directions during multi-angle rotation.

[0017] The reinforcing mechanism 4 is detachably assembled inside the main shaft 2. The reinforcing mechanism 4 includes a central connecting column 402. Multiple curved panels 401 are embedded and fixedly arranged circumferentially on the outer surface of the connecting column 402. The multiple curved panels 401 are distributed at an included angle of 120°, and the two ends of each curved panel 401 are slidably fitted into the corresponding positioning grooves 204. The multiple curved panels 401 are supported by the inner wall of the support cylinder 201. The curved panels 401 are made of carbon fiber reinforced composite material, and the carbon fiber volume fraction in the carbon fiber reinforced composite material is 60%-70%. Specifically, the connecting post 402 has a diameter of 20-25mm and a length of 180-220mm. Three curved panels 401 are embedded and fixed to the outer surface of the connecting post 402 using epoxy resin adhesive. The radius of curvature of the curved panel 401 matches the inner diameter of the support cylinder 201, with a thickness of 3-4mm and a width of 15-20mm. The lengths protruding from the outer surface of the connecting post 402 at both ends match the depth of the positioning groove 204. The 120° angled distribution of the three curved panels 401 forms a stable triangular support structure. The sliding fit assembly method facilitates the quick insertion or removal of the reinforcing mechanism 4 from the main shaft 2. The volume fraction of the carbon fiber reinforced composite material is controlled at 60%-70%, ensuring a tensile strength of 1500-1800MPa while controlling its density at 1.6-1.8g / cm³. 3The curved panel 401 and the inner wall of the support cylinder 201 are used to support and disperse stress, and the weight of the reinforcing mechanism 4 is further reduced, thus avoiding additional load on the main shaft 2.

[0018] A reinforcing layer 403 is fixedly sleeved inside the connecting column 402 along the axial direction. The reinforcing layer 403 is made of silicon carbide ceramic and has a thickness of 3-5mm. Its inner wall is provided with anti-slip texture. A support layer 404 is fixedly sleeved inside the reinforcing layer 403 along the axial direction. The support layer 404 is made of high-strength engineering plastic, specifically polyetheretherketone. The inner wall of the support layer 404 slides in fit with the outer wall of the connecting shaft 202. A wear-resistant coating is provided between the support layer 404 and the connecting shaft 202. The wear-resistant coating has a thickness of 0.5-1mm. Specifically, the reinforcing layer 403 is fixed inside the connecting column 402 by hot-pressing and nesting. Its inner wall has a continuous spiral anti-slip texture with a pitch of 10-15mm and a depth of 0.3-0.5mm. This texture increases the contact friction between the reinforcing layer 403 and the supporting layer 404, preventing relative sliding. The supporting layer 404 has a thickness of 4-6mm and is injection molded inside the reinforcing layer 403. The clearance between its inner wall and the outer wall of the connecting shaft 202 is controlled at 0.1-0.2mm. The silicon carbide ceramic has a hardness of HV1800-2200, which improves the compressive strength of the connecting column 402 and prevents deformation under axial pressure. The polyetheretherketone (PEEK) material has a temperature resistance of 250-300℃, adapting to the temperature rise during milling operations. Combined with a 0.5-1mm thick tungsten carbide wear-resistant coating, it reduces wear when the supporting layer 404 and the connecting shaft 202 slide relative to each other, extending their service life.

[0019] Multiple connecting blocks 203 are uniformly fixed along the circumference near the lower end of the support cylinder 201. A connecting shaft 202 is fixedly passed through the center of the multiple connecting blocks 203. The connecting shaft 202 is coaxial with the support cylinder 201 and is made of titanium alloy. Specifically, five connecting blocks 203 are provided. Each connecting block 203 has a fan-shaped cross-section with a radius of 10-15 mm and a thickness of 8-10 mm. They are fixed to the inner wall of the support cylinder 201 by welding. A through hole with a diameter matching that of the connecting shaft 202 is formed at the center of each of the five connecting blocks 203. The connecting shaft 202 has a diameter of 12-15 mm and a length of 30-40 mm. It is made of TC4 titanium alloy, with a tensile strength of 900-1100 MPa, and is inserted into the through hole of the connecting blocks 203 by interference fit. The fan-shaped structure of the five connecting blocks 203 ensures support strength while reducing the space occupied inside the support cylinder 201. The density of TC4 titanium alloy is only 4.5 g / cm³. 3It has a lower density than steel and excellent corrosion resistance, which can prevent the coolant from corroding the connecting shaft 202 during milling operations. The coaxial structure ensures that the connecting shaft 202 and the spindle 2 have the same force center, preventing eccentric loads during multi-angle rotation.

[0020] The lower end of the spindle 2 is fixedly provided with a milling head body 1, and the upper end of the spindle 2 is provided with a sealing cover 3 by a snap-fit ​​structure. An elastic sealing gasket is provided inside the sealing cover 3, and the elastic sealing gasket is tightly fitted with the upper end face of the support cylinder 201. Specifically, the lower outer wall of the spindle 2 has external threads, and the connecting end of the milling head body 1 has internal threads. The two are fixed by a threaded connection. The thread specification is M60-M80, and the pitch is 2-3mm. A polytetrafluoroethylene (PTFE) sealing tape is wrapped around the threaded connection to prevent coolant ingress. The diameter of the sealing cover 3 is the same as the outer diameter of the support cylinder 201. The snap-fit ​​structure includes three elastic claws on the inner wall of the sealing cover 3 and an annular groove on the upper outer wall of the support cylinder 201. The mating depth between the claws and the groove is 2-3mm. The elastic sealing gasket is made of nitrile rubber, with a thickness of 2-3mm and a Shore hardness of 50-60HA. The threaded connection facilitates the disassembly and maintenance of the milling head body 1 and the spindle 2. The PTFE sealing tape improves the sealing performance at the threads. The snap-fit ​​structure allows for quick opening and closing of the sealing cover 3. The nitrile rubber sealing gasket can adapt to temperature changes in the milling environment, and its tightly fitting structure prevents dust and coolant from entering the spindle 2, protecting the reinforcing mechanism 4 from contamination.

[0021] The upper end of the connecting column 402 extends to the upper opening of the support cylinder 201, and the upper end of the connecting column 402 is provided with a groove. The reinforcing mechanism 4 can be driven to be taken out from the inside of the main shaft 2 by a tool, so as to realize the separate and cyclic use of the reinforcing mechanism 4 and the main shaft 2. Specifically, the groove at the upper end of the connecting post 402 is hexagonal in shape, with a depth of 8-10mm and a distance between opposite sides of 6-8mm, matching a standard hex wrench. When it is necessary to disassemble the reinforcing mechanism 4, after opening the sealing cover 3, insert the hex wrench into the groove and apply an upward pulling force, which will drive the connecting post 402 and the curved panel 401 to slide out along the positioning groove 204. The design of the hexagonal groove ensures that the tool can be stably engaged, avoiding slippage during disassembly. The separable structure means that if either the reinforcing mechanism 4 or the spindle 2 is damaged, only the damaged part needs to be replaced, without the entire part being scrapped. For example, after the curved panel 401 is worn, the reinforcing mechanism 4 can be replaced separately, and the support cylinder 201 can still be used if it is intact, reducing equipment maintenance costs and improving the recycling rate of components.

[0022] Working principle: During assembly, the connecting shaft 202 is first fixed to the lower end of the support cylinder via the connecting block 203. Then, the connecting column 402, which is fitted with the reinforcing layer 403 and the supporting layer 404, is inserted into the support cylinder through the sliding fit between the two ends of the curved plate 401 and the positioning groove 204 of the support cylinder, so that the curved plate 401 fits against the inner wall of the support cylinder, thus completing the assembly of the reinforcing mechanism 4 and the spindle 2. Finally, the sealing cover 3 is snapped onto the upper end of the spindle 2 through the snap-fit ​​structure, and the elastic sealing gasket fits tightly against the upper end face of the support cylinder to achieve internal sealing of the spindle 2. Then, the lower end of the spindle 2 is connected and fixed to the milling head body 1 through the flange, thus completing the overall assembly of the milling head.

[0023] During operation, after the spindle 2 is connected to the milling machine, it drives the milling head body 1 to perform milling work. During the multi-angle rotation adjustment process, the radial and axial stress borne by the support cylinder is evenly distributed through the curved panel 401. The reinforcing layer 403 and the support layer 404 work together with the connecting shaft 202 to further enhance the support strength of the connecting column 402 and prevent the spindle 2 from deforming. When it is necessary to maintain or replace the internal components of the spindle 2, open the sealing cover 3, insert the Allen wrench into the groove at the upper end of the connecting column 402, and pull the reinforcing mechanism 4 to remove it from the inside of the spindle 2, so as to realize the individual inspection and recycling of the components.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-angle rotating milling head, characterized in that: include: The spindle (2) is connected to the milling machine to realize the milling work of the milling head. The spindle (2) includes a columnar support cylinder (201). Multiple positioning grooves (204) are evenly opened in the circumferential direction inside the support cylinder (201). The support cylinder (201) is integrally formed of high-strength aluminum alloy material. The tensile strength of the high-strength aluminum alloy material is not less than 500MPa and the yield strength is not less than 450MPa. The reinforcing mechanism (4) is detachably assembled inside the main shaft (2). The reinforcing mechanism (4) includes a central connecting column (402). Multiple curved panels (401) are embedded and fixedly arranged on the outer surface of the connecting column (402) along the circumferential direction. The multiple curved panels (401) are distributed at a 120° angle with each other. The two ends of each curved panel (401) are slidably fitted into the corresponding positioning groove (204). The multiple curved panels (401) are supported together on the inner wall of the support cylinder (201). The curved panels (401) are made of carbon fiber reinforced composite material. The carbon fiber volume fraction in the carbon fiber reinforced composite material is 60%-70%.

2. The multi-angle rotating milling head according to claim 1, characterized in that: Multiple connecting blocks (203) are uniformly fixed in the circumferential direction near the lower end of the support cylinder (201). A connecting shaft (202) is fixedly inserted through the center of the multiple connecting blocks (203). The connecting shaft (202) is coaxially arranged with the support cylinder (201) and is made of titanium alloy.

3. A multi-angle rotating milling head according to claim 1, characterized in that: The connecting column (402) is fitted with a reinforcing layer (403) along the axial direction inside. The material of the reinforcing layer (403) is silicon carbide ceramic, the thickness of the reinforcing layer (403) is 3-5mm, and its inner wall is provided with anti-slip texture.

4. A multi-angle rotating milling head according to claim 3, characterized in that: The reinforcing layer (403) is axially fixedly fitted with a support layer (404). The support layer (404) is made of high-strength engineering plastic, which is polyetheretherketone. The inner wall of the support layer (404) is slidably fitted with the outer wall of the connecting shaft (202). A wear-resistant coating is provided between the support layer (404) and the connecting shaft (202). The thickness of the wear-resistant coating is 0.5-1mm.

5. A multi-angle rotating milling head according to claim 1, characterized in that: The lower end of the spindle (2) is fixedly provided with a milling head body (1), and the upper end of the spindle (2) is provided with a sealing cover (3) by a snap-fit ​​structure. An elastic sealing gasket is provided on the inner side of the sealing cover (3), and the elastic sealing gasket is tightly fitted to the upper end surface of the support cylinder (201).

6. A multi-angle rotating milling head according to claim 1, characterized in that: The upper end of the connecting column (402) extends to the upper opening of the support cylinder (201), and the upper end of the connecting column (402) is provided with a groove. The reinforcing mechanism (4) can be driven to be taken out from the inside of the main shaft (2) by means of a tool, so as to realize the separate and cyclic use of the reinforcing mechanism (4) and the main shaft (2).

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