A right-angle milling head for machining centers

Abstract

This invention discloses a right-angle milling head for a machining center, comprising an input tool holder for power transmission, a spindle, an output tool holder, and a stabilizing mechanism for providing axial pressure to the spindle, thereby stabilizing the spindle. The spindle is horizontally mounted inside a housing, with both ends connected to the housing via bearings. The upper end of the spindle is connected to the input tool holder via a bevel gear set, and the output tool holder is mounted at one end of the spindle. This invention utilizes the high-speed rotation of the spindle to drive the rotation of a fixed extrusion disc and extrusion balls inside the fixed extrusion disc, thereby providing centrifugal force to the extrusion balls. When the extrusion balls are subjected to centrifugal force, they brush outwards to extrude the fixed extrusion disc and an adjusting extrusion disc, causing the adjusting extrusion disc to extrude a butterfly spring. The butterfly spring then provides extrusion pressure to the extrusion balls, the fixed extrusion disc, and the spindle in the opposite direction, thereby improving the spindle's tension, reducing spindle vibration, and improving spindle stability, ensuring spindle stability during rotation and guaranteeing the machining accuracy of the milling cutter.

Description

Technical Field

[0001] This invention relates to the field of right-angle milling heads, and in particular to a right-angle milling head for machining centers. Background Technology

[0002] CNC milling machines are automated machining equipment developed from general milling machines. The machining processes of the two are basically the same, and their structures are also somewhat similar. CNC milling machines are divided into two main categories: those without tool magazines and those with tool magazines. CNC milling machines with tool magazines are also called machining centers. In some end-face machining operations, right-angle milling heads are frequently used. Right-angle milling heads generally refer to transverse milling heads. Transverse milling heads are the most commonly used machine tool accessories among all angle heads. Their purpose is to expand the machining range of the machine tool, and they are widely used in situations involving large workpieces or products with high precision requirements.

[0003] A comparison with Chinese invention patent CN102909420B discloses a right-angle milling head device, which employs a stretching operation on the spindle during high-speed machining to ensure spindle stability. However, in practical applications, spindle runout generally occurs when axial force is applied, resulting in a force at an angle to the axial direction. If a simple stretching method is used, one end may experience greater force than the other, leading to an imbalance at both ends of the spindle. Furthermore, during stretching, some of the force is biased towards the other side of the machining direction, resulting in a less tight fit between the machining side and the housing. In addition, while tightening the spindle, it is necessary to consider eliminating vibration to ensure accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a right-angle milling head for machining centers in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A right-angle milling head for a machining center includes an input tool holder for transmitting power, a spindle, an output tool holder, and a stabilizing mechanism for providing axial pressure to the spindle to stabilize it. The spindle is laterally mounted inside a housing, with both ends of the spindle connected to the housing via bearings. The upper end of the spindle is connected to the input tool holder via a bevel gear set. An output tool holder is mounted on one end of the spindle, and a milling cutter is mounted on the output tool holder. The stabilizing mechanism is mounted on the spindle at the end away from the output tool holder.

[0007] The stabilizing mechanism includes a fixed extrusion plate and an adjusting extrusion plate. The fixed extrusion plate and the adjusting extrusion plate have the same structure and are symmetrically installed on the main shaft. The fixed extrusion plate is fixedly connected to the main shaft, and the adjusting extrusion plate is slidably connected to the main shaft. The opposing surfaces of the fixed extrusion plate and the adjusting extrusion plate have a conical groove structure. Four extrusion balls are evenly arranged between the fixed extrusion plate and the adjusting extrusion plate. The conical groove surfaces of the fixed extrusion plate and the adjusting extrusion plate are formed with grooves to restrict the extrusion balls. A set of butterfly-shaped springs is installed at the end of the adjusting extrusion plate away from the fixed extrusion plate. A force-bearing ring is provided on the butterfly-shaped springs at the end away from the adjusting extrusion plate. At the same time, a thrust bearing is provided at the end of the adjusting extrusion plate with the force-bearing ring. The thrust bearing abuts against the fixed end cover installed at the opening of the housing.

[0008] Preferably, the fixed extrusion disc is connected to the main shaft via a key.

[0009] This configuration ensures the axial position of the fixed extrusion disc on the main shaft, thereby providing axial pressure to the main shaft.

[0010] Preferably, the fixed end cap is connected to the housing by bolts, and the end face of the thrust bearing is in close contact with the end face of the fixed end cap.

[0011] With this configuration, the thrust bearing is used to provide axial pressure, thereby fixing the end face and providing pressure through the fixed end cap.

[0012] Preferably, the inner hole of the adjusting extrusion disc is slidably connected to the main shaft, and there is a gap between the outer end face of the adjusting extrusion disc and the inner hole of the housing.

[0013] With this configuration, the adjusting extrusion disc is subjected to extrusion by the inner extrusion balls and provides extrusion force in the reverse direction after sliding.

[0014] Preferably, the butterfly-shaped spring is slidably connected to the main shaft.

[0015] With this configuration, the butterfly-shaped spring is used to provide extrusion potential energy to the fixed extrusion disc.

[0016] Preferably, the force-bearing ring is integrally formed with the butterfly-shaped spring.

[0017] This design ensures the strong connection between the force-bearing ring and the butterfly-shaped spring.

[0018] Preferably, the two ends of the main shaft located inside the housing are connected to the housing via bearings, and the fixed extrusion plate and the end face of the bearing are mutually press-fitted.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The high-speed rotation of the spindle drives the fixed extrusion plate and the extrusion balls inside the fixed extrusion plate to rotate, thereby providing centrifugal force to the extrusion balls. When the extrusion balls are subjected to centrifugal force, they brush outward to extrude the fixed extrusion plate and the adjusting extrusion plate, causing the adjusting extrusion plate to extrude the butterfly spring. The butterfly spring then provides extrusion to the extrusion balls, the fixed extrusion plate, and the spindle in the opposite direction, thereby improving the tension effect of the spindle, reducing spindle vibration, and improving spindle stability. This ensures the stability of the spindle during rotation and guarantees the machining accuracy of the milling cutter. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a right-angle milling head for a machining center according to the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the housing of a right-angle milling head for a machining center according to the present invention;

[0024] Figure 3 This is a schematic diagram of the cooperation structure between the spindle and the stabilizing mechanism of a right-angle milling head for a machining center as described in this invention;

[0025] Figure 4 This is a first exploded view of the stabilization mechanism of a right-angle milling head for a machining center according to the present invention;

[0026] Figure 5 This is a second exploded view of the stabilization mechanism of a right-angle milling head for a machining center according to the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a right-angle milling head for a machining center in the state of extruding balls when the spindle is not rotating, as described in this invention.

[0028] Figure 7 This is a schematic diagram of the structure of the right-angle milling head for machining center under high-speed spindle rotation, as described in this invention, showing the state of the compressed balls.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Housing; 2. Input tool holder; 3. Output tool holder; 4. Milling cutter; 5. Bevel gear set; 6. Spindle; 7. Fixed end cover; 8. Bearing; 9. Stabilizing mechanism; 91. Fixed extrusion disc; 911. Adjusting extrusion disc; 92. Butterfly spring; 93. Thrust bearing; 94. Extrusion ball; 95. Force ring. Detailed Implementation

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] Example 1

[0035] like Figures 1-7 As shown, a right-angle milling head for a machining center includes an input tool holder 2 for transmitting power, a spindle 6, an output tool holder 3, and a stabilizing mechanism 9 for providing axial pressure to the spindle 6 to stabilize the spindle 6. The spindle 6 is horizontally mounted inside the housing 1, and both ends of the spindle 6 are connected to the inside of the housing 1 by bearings. The upper end of the spindle 6 is connected to the input tool holder 2 by a bevel gear set 5. The output tool holder 3 is mounted on one end of the spindle 6, and a milling cutter 4 is mounted on the output tool holder 3. The stabilizing mechanism 9 is mounted on the end of the spindle 6 away from the output tool holder 3.

[0036] The stabilizing mechanism 9 includes a fixed extrusion plate 91 and an adjusting extrusion plate 911. The fixed extrusion plate 91 and the adjusting extrusion plate 911 have the same structure and are symmetrically installed on the main shaft 6. The fixed extrusion plate 91 is fixedly connected to the main shaft 6, and the adjusting extrusion plate 911 is slidably connected to the main shaft 6. The opposing surfaces of the fixed extrusion plate 91 and the adjusting extrusion plate 911 have a conical groove structure. Four extrusion balls 94 are evenly arranged between the fixed extrusion plate 91 and the adjusting extrusion plate 911. The conical groove surfaces of the fixed extrusion plate 91 and the adjusting extrusion plate 911 are formed with grooves to restrict the extrusion balls 94. A set of butterfly springs 92 are installed at the end of the adjusting extrusion plate 911 away from the fixed extrusion plate 91. A force ring 95 is provided on the butterfly springs 92 at the end away from the adjusting extrusion plate 911. At the same time, a thrust bearing 93 is provided at the end of the adjusting extrusion plate 911 with the force ring 95. The thrust bearing 93 abuts against the fixed end cover 7 installed at the opening of the housing 1.

[0037] In this embodiment: the fixed extrusion disc 91 is connected to the main shaft 6 by a key to ensure the axial position of the fixed extrusion disc 91 on the main shaft 6, thereby providing axial pressure to the main shaft 6.

[0038] In this embodiment: the fixed end cover 7 is connected to the housing 1 by bolts, and the end face of the thrust bearing 93 is tightly fitted with the end face of the fixed end cover 7. The thrust bearing 93 is used to provide axial pressure, thereby fixing the end face and providing pressure through the fixed end cover 7.

[0039] In this embodiment: the inner hole of the adjusting extrusion disc 911 is slidably connected to the main shaft 6, and there is a gap between the outer end face of the adjusting extrusion disc 911 and the inner hole of the housing 1. The adjusting extrusion disc 911 is used to be squeezed by the inner extrusion ball 94, and to provide extrusion force in the opposite direction after sliding.

[0040] In this embodiment: the butterfly-shaped spring 92 is slidably connected to the main shaft 6, and the butterfly-shaped spring 92 is used to provide extrusion potential energy to the fixed extrusion disc 91.

[0041] In this embodiment, the force-bearing ring 95 is integrally formed with the butterfly-shaped spring piece 92, which ensures the fixed connection strength between the force-bearing ring 95 and the butterfly-shaped spring piece 92.

[0042] In this embodiment: the two ends of the main shaft 6 located inside the housing 1 are connected to the housing 1 through bearings 8, and the fixed extrusion plate 91 and the end face of the bearing 8 are mutually pressed and engaged. The bearing is a high-speed ceramic bearing.

[0043] Working principle: When the device is installed on a milling machine, the milling machine drives the spindle 6 to rotate through the input tool holder 2 and the bevel gear set 5. The spindle 6 drives the milling cutter 4 to rotate for machining through the output tool holder 3.

[0044] When the spindle 6 rotates, it drives the fixed extrusion plate 91 and the internal extrusion balls 94 to rotate via the key connection. After being subjected to centrifugal force, the extrusion balls 94 begin to be thrown outward. At the same time, they are squeezed in the space between the fixed extrusion plate 91 and the adjusting extrusion plate 911, squeezing the adjusting extrusion plate 911 towards the fixed extrusion plate 91. After being squeezed by the adjusting extrusion plate 911, the butterfly spring 92 provides extrusion force to the adjusting extrusion plate 911, the extrusion balls 94, the fixed extrusion plate 91, and the spindle 6 in the opposite direction. The more the adjusting extrusion plate 911 squeezes the butterfly spring 92, the stronger the reverse extrusion force provided by the butterfly spring 92 to the spindle 6. The spindle 6 will be subjected to axial pressure. The faster the speed, the higher the axial pressure, which promotes the tension of the spindle 6 and avoids the collision between the milling cutter 4 and the workpiece during the machining process.

[0045] And when the butterfly-shaped shrapnel 92 is compressed to the point where... Figure 7 When in the state, the force ring 95 will press against the thrust bearing 93. The inner side of the butterfly spring 92 and the force ring 95 simultaneously provide pressure to the adjusting extrusion plate 911, thereby ensuring effective support even under excessive speed conditions. At the same time, because the butterfly spring 92 is an elastic structure, it can also eliminate some of the vibrations that have already occurred, improving the stability of the spindle 6. With the spindle 6 ensuring effective stability, the machining accuracy of the milling cutter 4 is improved.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A right-angle milling head for a machining center, characterized in that: The device includes an input tool holder (2) for transmitting power, a spindle (6), an output tool holder (3), and a stabilizing mechanism (9) for providing axial pressure to the spindle (6) to stabilize the spindle (6). The spindle (6) is installed laterally inside the housing (1). Both ends of the spindle (6) are connected to the inside of the housing (1) by bearings. The upper end of the spindle (6) is connected to the input tool holder (2) by a bevel gear set (5). The output tool holder (3) is installed at one end of the spindle (6). A milling cutter (4) is installed on the output tool holder (3). The stabilizing mechanism (9) is installed on the spindle (6) at the end away from the output tool holder (3). The stabilizing mechanism (9) includes a fixed extrusion plate (91) and an adjusting extrusion plate (911). The fixed extrusion plate (91) and the adjusting extrusion plate (911) have the same structure and are symmetrically mounted on the main shaft (6). The fixed extrusion plate (91) is fixedly connected to the main shaft (6), and the adjusting extrusion plate (911) is slidably connected to the main shaft (6). The opposing surfaces of the fixed extrusion plate (91) and the adjusting extrusion plate (911) have a conical groove structure. Four extrusion balls (94) are evenly arranged between the fixed extrusion plate (91) and the adjusting extrusion plate (911). The conical grooves of the fixed extrusion plate (91) and the adjusting extrusion plate (911) are formed with grooves to restrict the extrusion balls (94). A set of butterfly springs (92) is installed on the end of the adjusting extrusion plate (911) away from the fixed extrusion plate (91). A force ring (95) is provided on the butterfly spring (92) away from the adjusting extrusion plate (911). At the same time, a thrust bearing (93) is provided on the end of the adjusting extrusion plate (911) with the force ring (95). The thrust bearing (93) abuts against the fixed end cap (7) installed at the opening of the housing (1).

2. A right-angle milling head for a machining center according to claim 1, characterized in that: The fixed extrusion plate (91) is connected to the main shaft (6) by a key.

3. A right-angle milling head for a machining center according to claim 1, characterized in that: The fixed end cap (7) is connected to the housing (1) by bolts, and the end face of the thrust bearing (93) is in close contact with the end face of the fixed end cap (7).

4. A right-angle milling head for a machining center according to claim 2, characterized in that: The inner hole of the adjusting extrusion disc (911) is slidably connected to the main shaft (6), and there is a gap between the outer end face of the adjusting extrusion disc (911) and the inner hole of the housing (1).

5. A right-angle milling head for a machining center according to claim 1, characterized in that: The butterfly-shaped spring (92) is slidably connected to the main shaft (6).

6. A right-angle milling head for a machining center according to claim 5, characterized in that: The force-bearing ring (95) and the butterfly-shaped spring (92) are integrally formed.

7. A right-angle milling head for a machining center according to claim 1, characterized in that: The main shaft (6) is located inside the housing (1) at both ends, which are connected to the housing (1) by bearings (8), and the fixed extrusion plate (91) and the end face of the bearing (8) are mutually pressed together.

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