Broaching mechanism and electric spindle

Abstract

The present application relates to the technical field of electric spindles, and in particular to a broaching mechanism and an electric spindle, the broaching mechanism comprising a shaft core, a pull rod assembly and a disc spring assembly, the shaft core being provided with a first cavity along its own axial direction; the pull rod assembly passing through the first cavity of the shaft core, the pull rod assembly comprising a central pull rod and a guide bar arranged on the outer surface of the central pull rod, the guide bar being located in the first cavity, and the guide bar being parallel to the central axis of the shaft core; the disc spring assembly being located in the first cavity and being sleeved on the outer peripheral side of the pull rod assembly, the disc spring assembly being provided with a sliding groove for slidingly cooperating with the guide bar, the broaching mechanism can effectively solve the problem of circumferential rotation of the disc spring assembly and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system.

Description

Technical Field

[0001] The present application relates to the technical field of electric spindles, and in particular to a broaching mechanism and an electric spindle. Background Art

[0002] The electric spindle has a transmission structure mode in which the built-in motor and the machine tool spindle are "combined into one". It is more adaptable to high-speed and high-precision rotation, and at the same time has low vibration, thus meeting the actual needs of mold CNC machine tools for precision processing and high-speed cutting.

[0003] In actual part machining, an electric spindle requires a broaching mechanism to clamp the tool and rotate at high speed. The tool is clamped by a spring in the broaching mechanism and a tool-releasing cylinder. High-speed rotation of the electric spindle generates centrifugal force, which can cause circumferential deviation of non-fixed rotating parts, affecting spindle vibration and part surface quality. Summary of the Invention

[0004] The purpose of the present application is to provide a broaching mechanism and an electric spindle, which can effectively solve the problem of circumferential rotation of the disc spring assembly and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system.

[0005] To this end, on the first aspect, an embodiment of the present application provides a broaching mechanism, comprising: an axis core, having a first cavity arranged along its own axial direction; a pull rod assembly, passing through the first cavity of the axis core, the pull rod assembly comprising a central pull rod and a guide bar arranged on the outer surface of the central pull rod, the guide bar being located in the first cavity, and the guide bar being parallel to the central axis of the axis core; and a disc spring assembly, located in the first cavity and sleeved on the outer peripheral side of the pull rod assembly, the disc spring assembly being provided with a sliding groove that slides with the guide bar.

[0006] In a possible implementation, a plurality of guide bars are provided, and the plurality of guide bars are distributed along the circumference of the central pull rod; a plurality of sliding grooves are provided on the inner surface of the disc spring assembly, and the plurality of sliding grooves are respectively slidably engaged with the plurality of guide bars.

[0007] In a possible implementation, a fixing groove is provided on the outer surface of the central pull rod along the axial direction, and the guide bar is fixed in the fixing groove.

[0008] In one possible implementation, the broaching mechanism further includes a spacer mounted on the outer peripheral side of the pull rod assembly, the spacer is located in the first cavity and is in sliding contact with the inner surface of the first cavity, a avoidance groove for avoiding the guide bar is provided on the spacer, and the spacer abuts against the disc spring assembly.

[0009] In one possible implementation, a positioning groove is provided axially on the outer surface of the center pull rod, and a limiting assembly is provided at the end of the shaft core. The limiting assembly includes a shoulder connected to the shaft core and a pin provided on the shoulder, and the end of the pin is slidably provided in the positioning groove.

[0010] In one possible implementation, a second cavity is provided along the axial direction of the shaft core, and the second cavity is connected to the first cavity through a connecting hole. A first gas channel is provided inside the shaft core, and the two ends of the first gas channel are respectively connected to the first cavity and the connecting hole; the center pull rod passes through the connecting hole and leaves a gap between it and the inner surface of the connecting hole, a sealing ring is provided on the outer peripheral side of the center pull rod, the sealing ring abuts against the inner surface of the connecting hole, and a second gas channel is provided on the end of the center pull rod away from the connecting hole; an air vent is provided inside the guide bar, and an air chamber is formed between the guide bar and the connecting hole, one end of the air vent is connected to the second gas channel, and the other end is connected to the air chamber.

[0011] In one possible implementation, the rod assembly includes a first position located at one end of the shaft core and a second position located at the other end of the shaft core. When the rod assembly is located at the first position, the sealing ring is located on one side of the first gas channel. When the rod assembly is located at the second position, the sealing ring is located on the other side of the first gas channel.

[0012] In one possible implementation, an air intake ring groove is provided on the outer peripheral side of the central pull rod, and a radial air hole is provided between the air intake ring groove and the second gas channel; the pull rod assembly also includes a nut provided on the outer peripheral side of the central pull rod, and an air intake hole connected to the air intake ring groove is provided on the nut.

[0013] In one possible implementation, the center pull rod is connected to the nut by a thread, a first conical surface is provided at one end of the center pull rod facing the nut, and a second conical surface is provided on the nut to abut against the first conical surface, and the angle between the second conical surface and the center line of the center pull rod is smaller than the angle between the first conical surface and the center line of the center pull rod.

[0014] In a possible implementation, a lubricating oil adding portion is provided on the outer circumference of the central pull rod, the lubricating oil adding portion is located in the first cavity, and an oil storage tank is provided on the outer circumference of the lubricating oil adding portion.

[0015] In one possible implementation, the pull rod assembly also includes a clamping cone arranged in the second cavity. The clamping cone is arranged at one end of the center pull rod for installing the tool. A cooling channel is axially penetrated inside the center pull rod, and the cooling channel is connected to the center hole of the clamping cone.

[0016] In a second aspect, an embodiment of the present application provides an electric spindle, comprising: a tool; and the above-mentioned broaching mechanism, wherein the pull rod assembly of the broaching mechanism is used for installing the tool.

[0017] According to the broaching mechanism and electric spindle provided in the embodiments of the present application, the broaching mechanism can limit the disc spring assembly in the circumferential direction through the sliding groove of the disc spring assembly and the sliding cooperation with the guide bar on the outer surface of the center pull rod. The disc spring assembly can only slide along the axial direction of the pull rod assembly, so that the disc spring assembly and the pull rod assembly form a relatively stable whole, which can effectively solve the problem of circumferential rotation of the disc spring assembly and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 A schematic cross-sectional view of a broaching mechanism provided in an embodiment of the present application is shown;

[0022] Figure 2 Show Figure 1 A partial enlarged structural diagram of the broaching mechanism shown;

[0023] Figure 3 Show Figure 1 The schematic diagram of the partial enlarged structure of the broaching mechanism at position B is shown;

[0024] Figure 4 A schematic diagram showing the three-dimensional structure of a pull rod assembly provided in an embodiment of the present application is shown;

[0025] Figure 5 A schematic cross-sectional view of a pull rod assembly provided in an embodiment of the present application is shown;

[0026] Figure 6 A schematic diagram of the three-dimensional structure of a disc spring assembly provided in an embodiment of the present application is shown.

[0027] Description of reference numerals:

[0028] 1. Shaft core; 11. First cavity; 111. Air chamber; 12. Second cavity; 13. First gas channel; 14. Communication hole; 141. Ring groove;

[0029] 2. Tie rod assembly; 21. Center tie rod; 211. Fixing groove; 212. Positioning groove; 213. Second gas channel; 214. Inlet ring groove; 215. Radial air hole; 216. First tapered surface; 217. Lubricating oil addition portion; 218. Oil reservoir; 219. Cooling channel; 22. Guide bar; 221. Vent hole; 23. Sealing ring; 24. Nut; 241. Inlet hole; 242. Second tapered surface; 25. Clamping cone;

[0030] 3. Disc spring assembly; 31. Sliding groove;

[0031] 4. Septum; 41. End septum; 42. Middle septum;

[0032] 5. Limit assembly; 51. Shoulder stop; 52. Pin;

[0033] 6. Rotor. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the embodiments of the present application. In addition, the embodiments of the present application may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0037] In order to solve the problems in the prior art, the present application provides a broaching mechanism that can effectively solve the problem of circumferential rotation of the disc spring assembly and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system.

[0038] like Figures 1 to 6 As shown, a broach mechanism provided in an embodiment of the present application includes: an axis core 1, a pull rod assembly 2 and a disc spring assembly 3.

[0039] The shaft core 1 is provided with a first cavity 11 along its axial direction.

[0040] The rod assembly 2 passes through the first cavity 11 of the shaft core 1 . The rod assembly 2 includes a central rod 21 and a guide bar 22 disposed on the outer surface of the central rod 21 . The guide bar 22 is located in the first cavity 11 and is parallel to the central axis of the shaft core 1 .

[0041] The disc spring assembly 3 is located in the first cavity 11 and is sleeved on the outer circumference of the pull rod assembly 2 . The disc spring assembly 3 is provided with a sliding groove 31 that is slidably engaged with the guide bar 22 .

[0042] In the present application, the disc spring assembly 3 can be limited in the circumferential direction by sliding the sliding groove 31 of the disc spring assembly 3 with the guide bar 22 on the outer surface of the center pull rod 21. The disc spring assembly 3 can only slide along the axial direction of the pull rod assembly 2, so that the disc spring assembly 3 and the pull rod assembly 2 form a relatively stable whole, thereby effectively solving the problem of circumferential rotation of the disc spring assembly 3 and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system.

[0043] Specifically, when the tool needs to be replaced, the drawbar assembly 2 is pushed to move by the oil cylinder, and the disc spring assembly 3 changes the compression amount when the drawbar assembly 2 slides axially. After the tool change is completed, the drawbar assembly 2 is pushed back to its original position by the elastic force of the disc spring assembly 3. Therefore, a gap needs to be left between the disc spring assembly 3 and the center drawbar 21, and a space needs to be left between the disc spring assembly 3 and the inner surface of the first cavity 11 so that the disc spring assembly 3 can change the compression amount within a certain range. This makes it easy for the disc spring assembly 3 to rotate circumferentially relative to the center drawbar 21 under the action of centrifugal force when rotating at high speed, affecting the dynamic balance of the broaching mechanism. In the embodiment of the present application, by providing a guide bar 22 on the outer circumference of the center drawbar 21, the sliding groove 31 of the disc spring assembly 3 can slide along the guide bar 22, and the guide bar 22 can limit the disc spring assembly 3 in the circumferential direction, so that the disc spring assembly 3 and the drawbar assembly 2 maintain synchronous rotation, so that the disc spring assembly 3 and the drawbar assembly 2 form a relatively stable whole, thereby improving the dynamic balance level of the broaching mechanism during operation.

[0044] Specifically, a rotor 6 is provided on the outer periphery of the shaft core 1 to drive the shaft core 1 and the pull rod assembly 2 to rotate.

[0045] In some embodiments, a plurality of guide bars 22 are provided, and the plurality of guide bars 22 are distributed along the circumference of the central pull rod 21 ; a plurality of sliding grooves 31 are provided on the inner surface of the disc spring assembly 3 , and the plurality of sliding grooves 31 are respectively slidably matched with the plurality of guide bars 22 .

[0046] In this application, four guide bars 22 are provided, and the four guide bars 22 are distributed along the circumference of the center pull rod 21. The inner surface of the disc spring assembly 3 is provided with four sliding grooves 31, and the four sliding grooves 31 are respectively slidably matched with the four guide bars 22. On the premise of ensuring that the disc spring assembly 3 can normally change the compression amount, the disc spring assembly 3 is further limited in the circumferential direction. Of course, other numbers of guide bars 22 can also be selected.

[0047] Specifically, multiple guide bars 22 are evenly distributed on the outer peripheral side of the center pull rod 21, and the disc spring assembly 3 and the center pull rod 21 are assembled later. Of course, multiple guide bars 22 can also be arranged on the outer peripheral side of the center pull rod 21 in a non-uniform manner.

[0048] In some embodiments, a fixing groove 211 is provided on the outer surface of the central pull rod 21 along the axial direction, and the guide bar 22 is fixedly disposed in the fixing groove 211 .

[0049] In the present application, the fixing groove 211 is a shallow arc groove, and the radius of the fixing groove 211 is equal to the radius of the guide bar 22, so that the guide bar 22 can be partially fixed in the fixing groove 211, increasing the contact area between the guide bar 22 and the fixing groove 211, thereby improving the fixing effect of the guide bar 22 and the center tie rod 21. Specifically, the guide bar 22 and the fixing groove 211 are fixed by welding using a connecting agent.

[0050] In some embodiments, the broaching mechanism further includes a spacer 4 sleeved on the outer peripheral side of the pull rod assembly 2, the spacer 4 is located in the first cavity 11 and in sliding contact with the inner surface of the first cavity 11, and a avoidance groove for avoiding the guide bar 22 is provided on the spacer 4, and the spacer 4 abuts against the disc spring assembly 3.

[0051] In the present application, the spacer 4 is arranged in the first cavity 11 and is sleeved on the outer peripheral side of the pull rod assembly 2, limiting the disc spring assembly 3 in the axial direction, so that the disc spring assembly 3 can drive the pull rod assembly 2 to reset, the inner ring of the spacer 4 slides with the outer surface of the center pull rod 21, and the outer ring slides with the inner surface of the first cavity 11, which can axially position the center pull rod 21 and the shaft core 1 to ensure the coaxiality of the center pull rod 21 and the shaft core 1. Specifically, the spacer 4 includes an end spacer 41 and a middle spacer 42. The end spacer 41 is arranged at one end of the disc spring assembly 3 to limit the entire disc spring assembly 3, and the middle spacer 42 is arranged in the middle of the disc spring assembly 3 to support the center pull rod 21 at different positions.

[0052] Specifically, the disc spring assembly 3 abuts against the outer peripheral side of the central pull rod 21 or the spacer 4 in sequence. In order to facilitate viewing the interior of the first cavity 11, part of the disc spring assembly 3 is omitted in the accompanying drawings.

[0053] In some embodiments, a positioning groove 212 is provided axially on the outer surface of the center pull rod 21, and a limiting assembly 5 is provided at the end of the shaft core 1. The limiting assembly 5 includes a shoulder 51 connected to the shaft core 1 and a pin 52 provided on the shoulder 51. The end of the pin 52 is slidably provided in the positioning groove 212.

[0054] In this application, the shoulder 51 is fixed to the shaft core 1 by bolts, and the end of the pin 52 on the shoulder 51 is slidably set in the positioning groove 212 of the center pull rod 21, so that the shaft core 1 can drive the center pull rod 21 to rotate. The length of the positioning groove 212 matches the moving stroke of the pull rod assembly 2, ensuring that the center pull rod 21 can slide within the stroke.

[0055] Specifically, a plurality of pins 52 are provided, and the plurality of pins 52 are arranged along the circumference of the shoulder 51. By controlling the screw-in length of the plurality of pins 52, the ends of the plurality of pins 52 are respectively in contact with the inner bottom walls of the plurality of positioning grooves 212, so that the center pull rod 21 can be positioned in the axial direction again to ensure the coaxiality of the center pull rod 21 and the shaft core 1.

[0056] In some embodiments, the shaft core 1 is provided with a second cavity 12 along its own axial direction, and the second cavity 12 is connected to the first cavity 11 through a connecting hole 14. A first gas channel 13 is provided inside the shaft core 1, and the two ends of the first gas channel 13 are respectively connected to the first cavity 11 and the connecting hole 14; the center pull rod 21 passes through the connecting hole 14 and a gap is left between it and the inner surface of the connecting hole 14, and a sealing ring 23 is provided on the outer peripheral side of the center pull rod 21, and the sealing ring 23 abuts against the inner surface of the connecting hole 14, and a second gas channel 213 is provided at the end of the center pull rod 21 away from the connecting hole 14; a vent hole 221 is provided inside the guide bar 22, and an air chamber 111 is formed between the guide bar 22 and the connecting hole 14, one end of the vent hole 221 is connected to the second gas channel 213, and the other end is connected to the air chamber 111.

[0057] In the related art, when the second cavity 12 is cleaned during tool change, gas is directly introduced into the second cavity 12 through the first cavity 11 of the shaft core 1. The disc spring assembly 3 is built into the second cavity 12 of the shaft core 1. The cleaning gas passes through the disc spring assembly 3, which will destroy the lubricating grease on the disc spring assembly 3. The disc spring assembly 3 will dry rub against the center pull rod 21 during repeated compression, thereby affecting the broaching force of the broaching mechanism and the life of the broaching mechanism.

[0058] In the present application, the second gas channel 213 is connected to the external gas source, and the inside of the second cavity 12 needs to be kept clean when changing the tool. When changing the tool, the cylinder pushes the center pull rod 21 to move, so that the sealing ring 23 moves from one side of the first gas channel 13 to the other side, so that the air chamber 111 and the first gas channel 13 are connected through the gap between the center pull rod 21 and the connecting hole 14. The external gas enters the air chamber 111 through the second gas channel 213 and the air hole 221, and enters the first gas channel 13 through the connecting hole 14 and blows into the second cavity 12 to clean the second cavity 12, so that the second cavity 12 remains clean during the tool change process. When the tool change is completed, the disc spring assembly 3 pushes the pull rod assembly 2 to reset, and the sealing ring 23 moves again between the first gas channel 13 and the air chamber 111, separating the first gas channel 13 from the air chamber 111 to prevent gas from entering the first gas channel 13 and the second cavity 12 again. This prevents the cleaning gas from damaging the lubricating grease on the surface of the disc spring assembly 3, thereby preventing the disc spring assembly 3 from dry friction with the pull rod assembly 2 during repeated compression, thereby ensuring the broaching force of the broaching mechanism and the service life of the broaching mechanism.

[0059] Specifically, the air chamber 111 is located between the end spacer 41 and the center pull rod 21, ensuring the relative sealing of the air chamber 111. When the clean gas is introduced, the gas can enter the first gas channel 13 without returning to the first cavity 11 to cause damage to the disc spring assembly 3.

[0060] In some embodiments, the rod assembly 2 includes a first position located at one end of the shaft core 1 and a second position located at the other end of the shaft core 1. When the rod assembly 2 is located at the first position, the sealing ring 23 is located on one side of the first gas channel 13. When the rod assembly 2 is located at the second position, the sealing ring 23 is located on the other side of the first gas channel 13.

[0061] In the present application, when the tool is changed, the pull rod assembly 2 is located in the first position, at which time the sealing ring 23 is located on the side of the first gas channel 13 away from the air chamber 111, so that the first gas channel 13 is connected to the air chamber 111; when operating normally, the pull rod assembly 2 slides to the second position, at which time the sealing ring 23 is located between the first gas channel 13 and the air chamber 111, separating the air chamber 111 and the first gas channel 13.

[0062] Specifically, an annular groove portion 141 is provided in the connecting hole 14, and the annular groove portion 141 is connected to the first gas channel 13. When the pull rod assembly 2 is in the first position, the sealing ring 23 is located between the annular groove portion 141 and the air chamber 111, playing a sealing role. When the pull rod assembly 2 moves to the second position, the sealing ring 23 moves to the other side of the annular groove portion 141, so that the air chamber 111 is connected with the annular groove portion 141 of the connecting hole 14, so that the clean gas in the air chamber 111 can enter the first gas channel 13 through the connecting hole 14.

[0063] In some embodiments, an air intake ring groove 214 is provided on the outer peripheral side of the center pull rod 21, and a radial air hole 215 is provided between the air intake ring groove 214 and the second gas channel 213; the pull rod assembly 2 also includes a nut 24 provided on the outer peripheral side of the center pull rod 21, and an air intake hole 241 connected to the air intake ring groove 214 is provided on the nut 24.

[0064] In this application, the external clean gas first enters the air inlet ring groove 214 through the air inlet hole 241 on the nut 24, is evenly distributed by the air inlet ring groove 214, and then enters the second gas channel 213 through the radial air hole 215, and then enters the corresponding guide bar 22 through the second gas channel 213 to complete the delivery of the clean gas.

[0065] In some embodiments, the center rod 21 is connected to the nut 24 by threads, and a first conical surface 216 is provided at one end of the center rod 21 facing the nut 24. A second conical surface 242 is provided on the nut 24 to abut against the first conical surface 216. The angle between the second conical surface 242 and the center line of the center rod 21 is smaller than the angle between the first conical surface 216 and the center line of the center rod 21.

[0066] In this application, the angle between the second conical surface 242 and the center line of the center rod 21 is smaller than the angle between the first conical surface 216 and the center line of the center rod 21. This structural design allows the nut 24 to be subjected to the tightening force of the first conical surface 216 when locked with the center rod 21, which can ensure the axial positioning of the nut 24 and the center rod 21 in a non-step state.

[0067] In some embodiments, a lubricating oil adding portion 217 is provided on the outer circumference of the central pull rod 21 . The lubricating oil adding portion 217 is located in the first cavity 11 . An oil storage tank 218 is provided on the outer circumference of the lubricating oil adding portion 217 .

[0068] In the present application, the lubricant adding portion 217 is integrally formed with the center pull rod 21. The diameter of the lubricant adding portion 217 is larger than the diameter of the center pull rod 21. A gap is left between the outer peripheral side of the lubricant adding portion 217 and the inner wall of the first cavity 11, so that the lubricant in the oil storage tank 218 can be transported to the first cavity 11 to replenish the lubricant for the disc spring assembly 3 when the pull rod assembly 2 moves laterally. The lubricant adding portion 217 is located on one side of the disc spring assembly 3. The lubricant adding portion 217 can limit the end of the disc spring assembly 3. When the center pull rod 21 moves toward the direction of the tool, the disc spring assembly 3 is squeezed by the lubricant adding portion 217. When the pull rod assembly 2 is reset, it also relies on the disc spring assembly 3 to push the lubricant adding portion 217 to reset the pull rod assembly 2.

[0069] In some embodiments, the pull rod assembly 2 also includes a clamping cone 25 disposed in the second cavity 12. The clamping cone 25 is disposed at one end of the center pull rod 21 for installing a tool. A cooling channel 219 is axially penetrated inside the center pull rod 21, and the cooling channel 219 is connected to the center hole of the clamping cone 25.

[0070] In the present application, a conical groove for clamping the tool is formed between the clamping cone 25 and the second cavity 12. When the pull rod assembly 2 moves toward the front, that is, the tool side, the clamping cone 25 moves out of the second cavity 12, and the tool can be replaced. Then, under the elastic force of the disc spring assembly 3, the pull rod assembly 2 moves backward, and the clamping cone 25 cooperates with the second cavity 12 to complete the clamping and fixation of the tool. A cooling channel 219 is provided on the central axis of the center pull rod 21, and a rotary joint is provided at one end of the cooling channel 219 away from the clamping cone 25. The external cooling water source is connected through the rotary joint. The cooling water enters the cooling channel 219 of the center pull rod 21 and is discharged from the center hole of the clamping cone 25, thereby optimizing the thermal expansion of the pull rod assembly 2 during the processing, so that the pull rod assembly 2 keeps working within a lower temperature range, and extends the service life of the pull rod assembly 2; at the same time, the cooling water can also cool the tool through the clamping cone 25. The pull rod assembly 2 is provided with a guide bar 22 on the outer peripheral side of the central pull rod 21 for conveying clean gas, and is used to convey cooling water through the internal cooling channel 219. It has a simple structure and will not affect the disc spring assembly 3. It solves the anti-rotation problem of the broaching mechanism in a small space and improves the dynamic balance level of the broaching mechanism.

[0071] The broaching mechanism can limit the disc spring assembly 3 in the circumferential direction by sliding cooperation between the sliding groove 31 of the disc spring assembly 3 and the guide bar 22 on the outer surface of the center pull rod 21. The disc spring assembly 3 can only slide along the axial direction of the pull rod assembly 2, so that the disc spring assembly 3 and the pull rod assembly 2 form a relatively stable whole, which can effectively solve the problem of circumferential rotation of the disc spring assembly 3 and the pull rod under high-speed rotation, thereby improving the dynamic balance level of the broaching system.

[0072] An embodiment of the present application provides an electric spindle, comprising: a tool; and the above-mentioned broaching mechanism, wherein the drawbar assembly 2 of the broaching mechanism is used for installing the tool.

[0073] In this application, the pull rod assembly 2 of the broaching mechanism is used to install the tool, and the rotor 6 outside the shaft core 1 drives the shaft core 1 and the pull rod assembly 2 to rotate, thereby realizing the rotation of the tool, and performing precision processing and high-speed cutting through the rotating tool.

[0074] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0075] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0076] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A broaching mechanism, characterized in that: include: The shaft core (1) is provided with a first cavity (11) along its axial direction; a pull rod assembly (2) passing through the first cavity (11) of the shaft core (1), the pull rod assembly (2) comprising a central pull rod (21) and a guide bar (22) arranged on the outer surface of the central pull rod (21), the guide bar (22) being located in the first cavity (11), the guide bar (22) being parallel to the central axis of the shaft core (1), the outer surface of the central pull rod (21) being axially provided with a fixing groove (211), the guide bar (22) being fixedly arranged in the fixing groove (211); and The disc spring assembly (3) is located in the first cavity (11) and is sleeved on the outer peripheral side of the pull rod assembly (2). The disc spring assembly (3) is provided with a sliding groove (31) that slides with the guide bar (22).

2. The broaching mechanism according to claim 1, characterized in that: The guide bars (22) are provided in plurality, and the plurality of guide bars (22) are distributed along the circumference of the central pull rod (21); The inner surface of the disc spring assembly (3) is provided with a plurality of sliding grooves (31), and the plurality of sliding grooves (31) are respectively slidably matched with the plurality of guide bars (22).

3. The broaching mechanism according to claim 1, characterized in that: The broaching mechanism further includes a spacer (4) sleeved on the outer peripheral side of the draw rod assembly (2), the spacer (4) being located in the first cavity (11) and in sliding contact with the inner surface of the first cavity (11), the spacer (4) being provided with an avoidance groove for avoiding the guide bar (22), and the spacer (4) being in contact with the disc spring assembly (3).

4. The broaching mechanism according to claim 1, characterized in that: The outer surface of the central pull rod (21) is provided with a positioning groove (212) along the axial direction, and a limiting assembly (5) is provided at the end of the shaft core (1). The limiting assembly (5) includes a shoulder (51) connected to the shaft core (1) and a pin (52) provided on the shoulder (51), and the end of the pin (52) is slidably provided in the positioning groove (212).

5. The broaching mechanism according to claim 1, characterized in that: The shaft core (1) is provided with a second cavity (12) along its own axial direction, the second cavity (12) is communicated with the first cavity (11) via a communicating hole (14), a first gas channel (13) is provided inside the shaft core (1), and both ends of the first gas channel (13) are communicated with the first cavity (11) and the communicating hole (14) respectively; The central pull rod (21) passes through the communicating hole (14) and a gap is left between the central pull rod (21) and the inner surface of the communicating hole (14). A sealing ring (23) is provided on the outer peripheral side of the central pull rod (21). The sealing ring (23) abuts against the inner surface of the communicating hole (14). A second gas channel (213) is provided at one end of the central pull rod (21) away from the communicating hole (14). A vent hole (221) is provided inside the guide bar (22), and an air chamber (111) is formed between the guide bar (22) and the connecting hole (14). One end of the vent hole (221) is connected to the second gas channel (213), and the other end is connected to the air chamber (111).

6. The broaching mechanism according to claim 5, characterized in that: The pull rod assembly (2) includes a first position located at one end of the shaft core (1) and a second position located at the other end of the shaft core (1). When the pull rod assembly (2) is located at the first position, the sealing ring (23) is located on one side of the first gas channel (13); when the pull rod assembly (2) is located at the second position, the sealing ring (23) is located on the other side of the first gas channel (13).

7. The broaching mechanism according to claim 5, characterized in that: An air intake annular groove (214) is provided on the outer peripheral side of the central pull rod (21), and a radial air hole (215) is provided between the air intake annular groove (214) and the second gas channel (213); The pull rod assembly (2) further comprises a nut (24) arranged on the outer peripheral side of the central pull rod (21), and the nut (24) is provided with an air intake hole (241) communicating with the air intake ring groove (214).

8. The broaching mechanism according to claim 7, characterized in that: The center rod (21) is connected to the nut (24) by a threaded connection. A first conical surface (216) is provided on one end of the center rod (21) facing the nut (24). A second conical surface (242) is provided on the nut (24) to abut against the first conical surface (216). The angle between the second conical surface (242) and the center line of the center rod (21) is smaller than the angle between the first conical surface (216) and the center line of the center rod (21).

9. The broaching mechanism according to claim 5, characterized in that: A lubricating oil adding portion (217) is provided on the outer peripheral side of the central pull rod (21), the lubricating oil adding portion (217) is located in the first cavity (11), and an oil storage tank (218) is provided on the outer peripheral side of the lubricating oil adding portion (217).

10. The broaching mechanism according to claim 5, characterized in that: The pull rod assembly (2) also includes a clamping cone (25) arranged in the second cavity (12), and the clamping cone (25) is arranged at one end of the center pull rod (21) for installing a tool. A cooling channel (219) is axially penetrated inside the center pull rod (21), and the cooling channel (219) is connected to the center hole of the clamping cone (25).

11. An electric spindle, characterized in that: include: Cutlery; as well as The broaching mechanism according to any one of claims 1 to 10, wherein the drawbar assembly (2) of the broaching mechanism is used for mounting the tool.

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