A micro CNC lathe

Abstract

The utility model discloses a kind of micro CNC lathes, it is related to numerical control lathe technical field.Micro CNC lathe includes: bed body main body, including hollow cavity and the reinforcing rib located in the inside of cavity;X-axis feeding module, connected with tool rest;Z-axis feeding module, including the Z-axis driving portion of being arranged in the side portion of bed body main body, Z-axis screw, Z-axis nut, first bearing seat, Z-axis nut is connected with first bearing seat, X-axis feeding module is installed in first bearing seat;Z-axis feeding module further includes first guide rail module, the first pressing block of first guide rail module is located between the first inclined surface of first installation groove of first linear guide rail and bed body main body setting, first pressing block is provided with the first wedge surface matched with first inclined surface, first connecting piece connects first linear guide rail and bed body main body, first sliding block is connected with first bearing seat. Thus, bed body main body realizes light weight and high rigidity, and improve the first linear guide rail initial installation accuracy, reduce equipment length size.

Description

Technical Field

[0001] This utility model relates to the field of CNC lathe technology, and in particular to a miniature CNC lathe. Background Technology

[0002] With the rapid development of high-tech industries such as microelectromechanical systems (MEMS) and precision medical devices, the market demand for micro and small precision parts has expanded dramatically. Existing lathes are gradually becoming miniaturized. To address the problems of low production efficiency, large footprint, and wasted energy and materials associated with machining micro parts using traditional large CNC lathes, micro CNC lathes are commonly used. However, the current use of micro CNC lathes for machining micro parts has the following disadvantages: First, the bed of a traditional micro CNC lathe is usually made of a simple profile frame or ordinary thick-walled solid cast iron, which has the problems of excessive weight, difficulty in handling and waste of materials. The simple profile structure has extremely poor bending and torsional rigidity, and is prone to elastic deformation during processing, which leads to tool chatter and unstable processing accuracy.

[0003] Secondly, the guide rails of traditional micro CNC lathes are only tightened by a single screw at the top. Due to the assembly gap in the bolt hole itself, the guide rail is prone to slight S-shaped twisting during manual assembly. It is also prone to lateral deviation when subjected to transverse cutting force, resulting in a decrease in the accuracy of the feed system.

[0004] Third, the Z-axis feed motor of traditional micro CNC lathes uses a direct-drive end connection, which significantly increases the overall length of the lathe. This not only violates the compactness requirement of desktop micro CNC lathes, but also the cantilevered motor can easily cause the overall center of gravity of the equipment to be too high, affecting the dynamic vibration resistance of the whole machine. Utility Model Content

[0005] The present invention introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the present invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] An embodiment of this utility model provides a miniature CNC lathe, including: a bed body, the bed body is configured as an integral structure, the bed body includes a hollow cavity and a reinforcing rib located inside the cavity, the top of the bed body is provided with a first mounting groove, and the groove wall of the first mounting groove is provided with a first inclined surface; The X-axis feed module is located above the bed body and is connected to a tool post. The Z-axis feed module includes a Z-axis drive unit, a Z-axis lead screw, a Z-axis nut, and a first bearing seat, all located on the side of the bed body. The Z-axis lead screw extends along a first direction and is poweredly connected to the Z-axis drive unit. The Z-axis nut is threadedly connected to the Z-axis lead screw and to the first bearing seat. The X-axis feed module is mounted on the first bearing seat. The Z-axis feed module also includes a first guide rail module, which includes a first linear guide rail, a first slider, a first connector, a first pressure block, and a first adjusting member. The bottom end of the first linear guide rail is accommodated in a first mounting groove. The first pressure block is located between the first linear guide rail and a first inclined surface and has a first wedge-shaped surface that matches the first inclined surface. The first adjusting member passes through the first pressure block and is connected to the bed body to adjust the position of the first pressure block relative to the bottom of the first mounting groove. The first connector connects the first linear guide rail and the bed body. The first slider is slidably connected to the first linear guide rail and to the first bearing seat.

[0007] For example, the Z-axis feed module further includes: a first mounting base, through which the Z-axis drive unit is mounted to the bed body; a first coupling, through which the output shaft of the Z-axis drive unit is poweredly connected to the Z-axis lead screw; a second lead screw support, which is located on the same side of the bed body as the first mounting base, and the free end of the Z-axis lead screw is rotatably connected to the second lead screw support; and a first connecting seat, which connects the Z-axis nut and the first bearing seat.

[0008] For example, the X-axis feed module includes: an X-axis drive unit, which is mounted on one end of the exterior of the first carrier along a second direction, the second direction being perpendicular to the first direction; an X-axis lead screw, which extends along the second direction and is disposed inside the first carrier, the X-axis lead screw being poweredly connected to the X-axis drive unit; and an X-axis nut, which is threadedly connected to the X-axis lead screw and connected to the second carrier, the tool holder being mounted on the second carrier.

[0009] For example, the X-axis feed module further includes: a support platform, which is installed inside the first bearing seat, and a second mounting groove is provided on the support platform, the groove wall of the second mounting groove being provided with a second inclined surface; a second guide rail module, which includes a second linear guide rail, a second slider, a second connector, a second pressure block, and a second adjusting member, the bottom end of the second linear guide rail being accommodated in the second mounting groove, the second pressure block being located between the second linear guide rail and the second inclined surface, and being provided with a second wedge-shaped surface matching the second inclined surface, the second adjusting member passing through the second pressure block and connecting to the support platform to adjust the position of the second pressure block and the bottom of the second mounting groove, the second connector connecting the second linear guide rail and the support platform, and the second slider being slidably connected to the second linear guide rail and connected to the second bearing seat.

[0010] For example, the X-axis feed module further includes a bellows cover, which is disposed between the X-axis drive unit and the second carrier, and between the second carrier and the first carrier, and the bellows cover is configured as a foldable flexible component.

[0011] For example, the X-axis feed module further includes: a second mounting base, wherein the X-axis drive unit is mounted on the outside of the first carrier through the second mounting base, and the output shaft of the X-axis drive unit passes through the first carrier and extends into the interior of the first carrier; The second coupling is located inside the first bearing seat and connects the output shaft of the X-axis drive unit and the X-axis lead screw; the first lead screw support is located inside the first bearing seat, and the free end of the X-axis lead screw is rotatably connected to the first lead screw support.

[0012] For example, the miniature CNC lathe further includes: a spindle box module, which includes a box body, a spindle drive unit, a spindle, and a chuck. The box body is installed on the top of the bed body on the side away from the X-axis feed module. The spindle drive unit is installed on the outside of the box body. The chuck is installed on the side of the box body facing the X-axis feed module. The spindle is connected to the spindle drive unit and the chuck by the internal power of the box body.

[0013] For example, the spindle box module further includes: a transmission mechanism, wherein the end of the spindle away from the chuck passes through the box body and is poweredly connected to the spindle drive unit through the transmission mechanism; an angular contact ball bearing, wherein the portion of the spindle away from the chuck is rotatably connected to the box body through the angular contact ball bearing; a double-row angular contact ball bearing, wherein the portion of the spindle near the chuck is rotatably connected to the box body through the double-row angular contact ball bearing; a front bearing cover, connected to the box body, and configured to cover the double-row angular contact ball bearing and limit its movement; and a rear bearing cover, connected to the box body, and configured to cover the angular contact ball bearing and limit its movement.

[0014] For example, the transmission mechanism includes a drive pulley, a timing pulley, and a belt. The drive pulley is connected to the output shaft of the main shaft drive unit, the timing pulley is connected to the main shaft, and the belt is wound around the drive pulley and the timing pulley. The diameter of the timing pulley is larger than the diameter of the drive pulley.

[0015] For example, the top of the main body of the box is a dome structure, and the side walls of the main body of the box are straight walls; the main shaft is a stepped structure, and the diameter of the main shaft decreases step by step from the direction of approaching to away from the chuck, and a locking nut is screwed on the end of the main shaft away from the chuck.

[0016] The miniature CNC lathe provided in this embodiment includes a bed body, an X-axis feed module, and a Z-axis feed module. By designing the bed body as a hollow cavity structure and adding reinforcing ribs inside the cavity, it can accurately cut non-load-bearing materials while maintaining a small bed body size. This significantly improves the bending and torsional moment of inertia resistance of the bed cross-section, achieving a balance between lightweight and high rigidity. By side-mounting the Z-axis drive unit of the Z-axis feed module to the side of the bed body and using a lead screw and nut mechanism to drive the X-axis feed module along the Z-axis, the total length of the miniature lathe along the first direction can be significantly shortened and the center of gravity lowered. This saves equipment space while giving the system excellent dynamic response and overload resistance, improving the overall dynamic vibration resistance of the machine. The first linear guide rail is installed with the assistance of a wedge-shaped first pressure block, breaking away from the traditional extensive mode of positioning by relying on the hole position margin. The physical hard limit assembly process of "first positioning by lateral inclined surface extrusion, and then vertical locking at the top" is adopted, which ensures the absolute straightness of the first linear guide rail in the initial installation from the source. That is, the random error of manual adjustment and assembly is eliminated by using structural mechanics, which greatly ensures the accuracy of the guide rail and is suitable for widespread application.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein: Figure 1 One of the structural schematic diagrams of the miniature CNC lathe provided in the embodiment of this utility model is shown; Figure 2 This image shows one of the partial cross-sectional views from a first perspective of the X-axis feed module provided in an embodiment of the present invention; Figure 3 It shows Figure 2 A partially enlarged schematic diagram of point A in the illustrated embodiment; Figure 4 This illustration shows one of the second-view structural schematic diagrams of the X-axis feed module provided in an embodiment of the present invention; Figure 5 It shows Figure 4 A partially enlarged schematic diagram of point B in the illustrated embodiment; Figure 6This shows one of the third-view partial cross-sectional views of the X-axis feed module provided in an embodiment of the present invention; Figure 7 This illustration shows one of the fourth-view structural diagrams of the X-axis feed module provided in an embodiment of the present invention; Figure 8 This illustration shows one of the fifth-view structural diagrams of the X-axis feed module provided in an embodiment of the present invention; Figure 9 One of the partial cross-sectional views from a first perspective of the spindle box module provided in an embodiment of the present invention is shown; Figure 10 One of the second-view structural schematic diagrams of the spindle box module provided in an embodiment of the present invention is shown; Figure 11 It shows Figure 10 A partially enlarged cross-sectional view at point C in the illustrated embodiment; Figure 12 This illustration shows one of the third-view structural schematic diagrams of the spindle box module provided in an embodiment of the present invention; Figure 13 This is one of the fourth-view structural schematic diagrams of the spindle box module provided in an embodiment of the present invention.

[0019] in, Figures 1 to 13 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100. Bed body; 101. Cavity; 102. Reinforcing rib; 200. X-axis feed module; 201. Tool post; 202. X-axis drive unit; 203. X-axis lead screw; 204. X-axis nut; 205. Second bearing seat; 206. Support platform; 2061. Second mounting slot; 207. Second linear guide; 208. Second slider; 209. Second pressure block; 210. Bellows cover; 211. Second mounting seat; 212. Second coupling; 213. First lead screw support seat; 214. First screw; 215. Second screw; 216. Third screw; 217. First bolt; 218. Fourth screw; 219. Second bolt; 300. Z-axis feed module; 301. Z-axis drive unit; 3 02. Z-axis lead screw; 303. First bearing seat; 304. First linear guide; 305. First slider; 306. First connector; 307. First pressure block; 308. First mounting seat; 309. First coupling; 310. Second lead screw support seat; 311. First connecting seat; 400. Spindle box module; 401. Box body; 402. Spindle drive unit; 403. Spindle; 404. Chuck; 405. Angular contact ball bearing; 406. Double row angular contact ball bearing; 407. Front bearing cover; 408. Rear bearing cover; 409. Drive pulley; 410. Synchronous pulley; 411. Belt; 412. Motor flange bracket; 413. Fifth screw; 414. Sixth screw; 415. Seventh screw. Detailed Implementation

[0020] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0022] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0023] like Figures 1 to 13 As shown in the figure, an embodiment of the present invention provides a miniature CNC lathe, comprising: a bed body 100, the bed body 100 being an integral structure, the bed body 100 including a hollow cavity 101 and a reinforcing rib 102 located inside the cavity 101, a first mounting groove being provided on the top of the bed body 100, and a first inclined surface being provided on the groove wall of the first mounting groove; an X-axis feed module 200, arranged above the bed body 100, connected to a tool post 201; and a Z-axis feed module 300, including a Z-axis drive unit 301, a Z-axis lead screw 302, a Z-axis nut, and a first bearing seat 303 disposed on the side of the bed body 100, the Z-axis lead screw 302 extending along a first direction and being poweredly connected to the Z-axis drive unit 301, the Z-axis nut being threadedly connected to the Z-axis lead screw 302 and connected to the first bearing seat 303. The X-axis feed module 200 is mounted on the first support 303. The Z-axis feed module 300 also includes a first guide rail module, which includes a first linear guide rail 304, a first slider 305, a first connector 306, a first pressure block 307, and a first adjusting member. The bottom end of the first linear guide rail 304 is accommodated in a first mounting groove. The first pressure block 307 is located between the first linear guide rail 304 and a first inclined surface and is provided with a first wedge-shaped surface that matches the first inclined surface. The first adjusting member passes through the first pressure block 307 and is connected to the bed body 100 to adjust the position of the first pressure block 307 and the bottom of the first mounting groove. The first connector 306 connects the first linear guide rail 304 and the bed body 100. The first slider 305 is slidably connected to the first linear guide rail 304 and is connected to the first support 303.

[0024] Among them, such as Figure 1As shown, the bed body 100 provides reliable support for other modules such as the X-axis feed module 200 and the Z-axis feed module 300. By setting the bed body 100 as an integral structure, such as the bed body 100 being cast in one piece, it has strong overall rigidity, good seismic performance, high structural strength, large load-bearing capacity, and is resistant to heavy cutting impact, thus having high reliability. By setting the bed body 100 as a hollow cavity 101 structure and setting reinforcing ribs 102 inside the cavity 101, such as by hollowing out the bed body 100 to reduce weight and setting it as a hollow cavity 101 structure, and setting reinforcing ribs 102 inside, and further, the internal hollowing out and reinforcing ribs 102 can adopt a topological structure design, in this way, while ensuring that the size of the bed body 100 is small, such as the bed body 100 having a limit table size, it can accurately cut materials in the non-load-bearing area, and at the same time significantly improve the bending and torsional moment of inertia of the bed section, achieving a unity of lightweight and high rigidity of the bed body 100. This solves the problems of the traditional micro CNC lathe bed body being assembled from thick-walled solid cast iron, which has problems such as excessive equipment weight, difficulty in handling and waste of materials, and the traditional bed body using simple profile structure being prone to elastic deformation during processing, resulting in tool chatter and unstable processing accuracy. This is suitable for widespread application.

[0025] Specifically, the bed body 100, through topological lightweight optimization, is scientifically designed as a hollow cavity 101 with reinforcing ribs 102, which enables the first-order natural frequency to soar to 451.39Hz, eliminating the possibility of resonance with the fundamental frequency of the spindle 403. Specifically, the reinforcing ribs 102 can be positioned laterally and / or longitudinally, such as... Figure 1 As shown, the reinforcing ribs 102 are arranged laterally, with multiple reinforcing ribs 102 arranged at intervals. The lateral direction can be a second direction, such as... Figure 1 As shown by the arrow X in the image, the vertical direction can be the first direction, such as... Figure 1 As indicated by arrow Z in the diagram.

[0026] The X-axis feed module 200 is located above the bed body 100 and is connected to a tool holder 201. The tool holder 201 can carry different tools for quick installation and adjustment of turning tools, improving tool changing efficiency and thus improving machining efficiency.

[0027] The Z-axis feed module 300 is connected to the X-axis feed module 200 and is used to drive the X-axis feed module 200 to move along a first direction to adjust the position of the tool holder 201. Specifically, the Z-axis feed module 300 includes a Z-axis drive unit 301, a Z-axis lead screw 302, a Z-axis nut, and a first support 303, all located on the side of the bed body 100. The drive source for the Z-axis feed module 300 is the Z-axis drive unit 301, which adopts a side-mounted layout, such as a 100W servo motor. The Z-axis drive unit 301 is poweredly connected to the Z-axis lead screw 302 to drive the Z-axis lead screw 302 to rotate. The Z-axis nut converts the rotational motion of the Z-axis lead screw 302 into linear motion along the first direction, thereby driving the first support 303 to move along the first direction. This, in turn, drives the X-axis feed module 200 connected to the first support 303 and the tool holder 201 connected to the X-axis feed module 201 to move along the first direction, thus realizing the position adjustment operation of the tool holder 201 along the first direction. Therefore, in this embodiment, by side-mounting the Z-axis drive unit 301 to the side of the bed body and combining it with the lead screw and nut mechanism, compared with the direct end connection method of the Z-axis feed motor in the traditional micro CNC lathe, the total length of the micro lathe along the first direction can be significantly shortened and the center of gravity can be lowered. While saving equipment space, it gives the system excellent dynamic response and overload resistance, and improves the dynamic vibration resistance of the whole machine.

[0028] Specifically, the two ends of the Z-axis lead screw 302 do not extend beyond the corresponding ends of the bed body 100. This satisfies the compact layout requirements of micro CNC lathes, achieving the design requirements of compact structure, small size, and desktop miniaturization, making it suitable for widespread application. Specifically, the Z-axis lead screw 302 can be a 1204 model ball screw (nominal outer diameter of the Z-axis lead screw is 12mm, lead is 4mm).

[0029] Among them, such as Figure 1As shown, to improve the motion accuracy of the X-axis feed module 200 along the first direction, the Z-axis feed module 300 also includes a first guide rail module with a guiding function. The first guide rail module includes a first linear guide rail 304, a first slider 305, a first connector 306, a first pressure block 307, and a first adjusting member. A first mounting groove is provided on the top of the bed body 100, and the groove wall of the first mounting groove is provided with a first inclined surface. The bottom end of the first linear guide rail 304 is accommodated in the first mounting groove. The first pressure block 307 is located between the first linear guide rail 304 and the first inclined surface, and the first pressure block 307 is provided with a first wedge-shaped surface that matches the first inclined surface. The first adjusting member passes through the first pressure block 307 and connects to the bed body 100 to adjust the position of the first pressure block 307 relative to the bottom of the first mounting groove. Thus, through the cooperation of the first wedge-shaped surface and the first inclined surface, the first linear guide 304 is tightly pressed against the side wall of the first mounting groove away from the first inclined surface by the wedge-shaped force-increasing mechanism of the first pressure block 307. Then, the first connecting piece 306 connects the first linear guide 304 and the bed body 100 in the vertical direction, ensuring that the first linear guide 304 can be reliably and accurately installed in the first mounting groove, and guaranteeing extremely high straightness of the Z-axis feed. This mechanism of using the wedge-shaped first pressure block 307 to assist in the installation of the first linear guide 304 breaks the traditional rough mode of relying on hole position allowance for positioning. It adopts a physical hard-limiting assembly process of "first side inclined surface compression positioning, then top vertical locking", which guarantees the absolute straightness of the initial installation of the first linear guide 304 from the source. That is, it uses structural mechanics to eliminate the random error of manual adjustment assembly, greatly ensuring the accuracy of the guide rail. Compared with traditional micro lathe guideways that rely solely on a single top screw for clamping, this design reduces the likelihood of the first linear guideway 304 bending or lateral deflection, thereby improving Z-axis feed accuracy.

[0030] Since the first slider 305 is slidably connected to the first linear guide rail 304 and connected to the first support seat 303, the sliding of the first slider 305 along the first linear guide rail 304 provides a good guiding and limiting effect on the first support seat 303 and the X-axis feed module 200 mounted on the first support seat 303. This improves the movement accuracy of the X-axis feed module 200 along the first direction, which is beneficial to improving the movement accuracy of the tool holder 201, and improving the tool changing accuracy and tool changing efficiency.

[0031] Specifically, there can be multiple first pressing blocks 307, which are spaced apart on one side of the first linear guide 304. The first linear guide 304 is laterally squeezed by the multiple first pressing blocks 307 from different positions. The cooperation of the multiple first pressing blocks 307 ensures that the first linear guide 304 has a high degree of straightness.

[0032] Therefore, the miniature CNC lathe provided in this embodiment includes a bed body 100, an X-axis feed module 200, and a Z-axis feed module 300. By setting the bed body 100 as a hollow cavity 101 structure and setting reinforcing ribs 102 inside the cavity 101, the non-load-bearing material can be accurately cut while ensuring that the size of the bed body 100 is small. This also significantly improves the bending and torsional moment of inertia of the bed cross section, achieving a balance between lightweight and high rigidity. By side-mounting the Z-axis drive unit 301 of the Z-axis feed module 300 to the side of the bed body 100 and using a lead screw and nut mechanism to drive the X-axis feed module 200, the length of the miniature lathe along the first direction can be significantly shortened and the center of gravity lowered. This saves equipment space while giving the system excellent dynamic response and overload resistance, improving the overall dynamic vibration resistance of the machine. The first linear guide rail 304 is installed with the assistance of the wedge-shaped first pressure block 307. This breaks away from the traditional rough mode of positioning by relying on the hole position margin. The physical hard limit assembly process of "first positioning by lateral inclined surface extrusion, and then vertical locking at the top" is adopted. This ensures the absolute straightness of the first linear guide rail 304 in the initial installation from the source. That is, the random error of manual adjustment and assembly is eliminated by using structural mechanics, which greatly ensures the accuracy of the guide rail and is suitable for widespread application.

[0033] like Figure 1 As shown, in some embodiments provided by this utility model, the Z-axis feed module 300 further includes a first mounting base 308. The first mounting base is of high strength. The Z-axis drive unit 301 and the Z-axis lead screw 302 are rigidly connected to the bed body 100 through the high-strength first mounting base 308. Thus, the two components, the Z-axis drive unit 301 and the Z-axis lead screw 302, can be supported by a single first mounting base 308, which helps to simplify the structure.

[0034] The Z-axis feed module 300 further includes a first coupling 309, which can be a flexible coupling. The output shaft of the Z-axis drive unit 301 is poweredly connected to the Z-axis lead screw 302 via the first coupling 309. For example, the power output shaft of the Z-axis drive unit 301 drives the Z-axis lead screw 302 to rotate via the flexible coupling. The Z-axis lead screw 302 can be a ball screw.

[0035] The Z-axis feed module 300 also includes a second lead screw support 310. The second lead screw support 310 and the first mounting base 308 are located on the same side of the bed body 100. The free end of the Z-axis lead screw 302 is rotatably connected to the second lead screw support 310, that is, the overhanging end of the Z-axis lead screw 302 is radially positioned and supported by the second lead screw support 310.

[0036] Among them, such as Figure 1As shown, the Z-axis feed module 300 also includes a first connecting seat 311, which connects the Z-axis nut and the first bearing seat 303. Specifically, the Z-axis nut on the Z-axis lead screw 302 is connected to the first bearing seat 303 via the first connecting seat 311, converting the rotational motion of the Z-axis lead screw 302 into the linear feed motion of the first bearing seat 303, thereby driving the X-axis feed module 200 to adjust its position along the first direction. Specifically, the first connecting seat 311 can be a flange connector, a connecting seat, or other similar structure.

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, in some embodiments provided by this utility model, the X-axis feed module 200 includes: an X-axis drive unit 202, which is installed at one end of the exterior of the first support 303 along a second direction, the second direction being perpendicular to the first direction; an X-axis lead screw 203, which extends along the second direction and is disposed inside the first support 303, and is poweredly connected to the X-axis drive unit 202; an X-axis nut 204, which is threadedly connected to the X-axis lead screw 203 and connected to the second support 205; and a tool holder 201, which is installed on the second support 205.

[0038] In this embodiment, the drive source for the X-axis feed module 200 is the X-axis drive unit 202, which can be a 100W servo motor. The end of the X-axis feed module 200 is a second support 205, and the tool holder 201 is mounted on the second support 205. The tool holder 201 can be a high-rigidity T-shaped tool holder for quick installation and adjustment of turning tools. The X-axis drive unit 202 is powered by the X-axis lead screw 203, driving the X-axis lead screw 203 to rotate. The rotational motion of the X-axis lead screw 203 is converted into linear motion of the second support 205 along a second direction by the X-axis nut 204 on the X-axis lead screw 203. This allows for adjustment of the position of the tool holder 201 along the second direction, which helps improve tool changing efficiency and thus improves the overall machining efficiency.

[0039] Furthermore, the X-axis lead screw 203 has a small lead. Specifically, the X-axis lead screw 203 is a 0802 (X-axis lead screw nominal outer diameter is 8mm, lead is 2mm) small lead miniature ball screw. The X-axis feed module 200, through the X-axis drive unit 202 and the lead screw nut mechanism, can exert a mechanical speed reduction and torque increase effect similar to "shifting to first gear", enabling even a small power motor to generate strong anti-cutting thrust.

[0040] like Figure 4 , Figure 5As shown, in some embodiments provided by this utility model, the X-axis feed module 200 further includes: a support platform 206, which is installed inside the first bearing seat 303. The support platform 206 is provided with a second mounting groove 2061, and the groove wall of the second mounting groove 2061 is provided with a second inclined surface; a second guide rail module, which includes a second linear guide rail 207, a second slider 208, a second connector, a second pressure block 209, and a second adjusting member. The bottom end of the second linear guide rail 207 is accommodated in the second mounting groove 2061. The second pressure block 209 is located between the second linear guide rail 207 and the second inclined surface and has a second wedge-shaped surface that matches the second inclined surface. The second adjusting member passes through the second pressure block 209 and is connected to the support platform 206 to adjust the position of the second pressure block 209 and the bottom of the second mounting groove 2061. The second connector connects the second linear guide rail 207 and the support platform 206. The second slider 208 is slidably connected to the second linear guide rail 207 and connected to the second bearing seat 205.

[0041] The support platform 206 serves as the basic load-bearing component, and the second linear guide 207 can be mounted on the support platform 206. It is understood that the X-axis lead screw 203 and the X-axis drive unit 202 can also be mounted on the support platform 206. Specifically, the various components can be rigidly connected using various standard fasteners (such as Phillips head screws, hexagonal head screws, and Phillips countersunk screws).

[0042] The second guide rail module includes a second linear guide rail 207, a second slider 208, a second connector, a second pressure block 209, and a second adjusting component. A second mounting groove 2061 is provided on the top of the support platform 206. The groove wall of the second mounting groove 2061 is provided with a second inclined surface. The second wedge-shaped surface of the second pressure block 209 cooperates with the second inclined surface. The second adjusting component adjusts the position of the second pressure block 209 and the bottom of the second mounting groove 2061. The wedge-shaped force-increasing mechanism of the second pressure block 209 tightly presses the second linear guide rail 207 against the side wall of the second mounting groove 2061 away from the second inclined surface. Then, the second connector connects the second linear guide rail 207 and the support platform 206 in the vertical direction to ensure that the second linear guide rail 207 can be reliably and accurately installed in the second mounting groove 2061 and to ensure extremely high straightness of the X-axis feed. This mechanism, which utilizes a wedge-shaped second pressure block 209 to assist in the installation of the second linear guide 207, breaks away from the traditional extensive mode of positioning based on hole allowance. It adopts a physical hard-limit assembly process of "first positioning by lateral inclined surface compression, and then vertical locking at the top," which ensures the absolute straightness of the initial installation of the second linear guide 207 from the source. That is, it uses structural mechanics to eliminate the random errors of manual adjustment and assembly, greatly ensuring the accuracy of the guide. Compared with the traditional micro lathe guide that relies solely on a single top screw for clamping, it reduces the possibility of the second linear guide 207 bending or lateral deviation, and improves the X-axis feed accuracy.

[0043] Since the second slider 208 is slidably connected to the second linear guide 207 and also connected to the second support 205, the sliding of the second slider 208 along the second linear guide 207 provides good guiding and limiting for the second support 205 and the tool holder 201 mounted on the second support 205, thereby improving the movement accuracy of the tool holder 201 in the second direction and improving tool changing accuracy and efficiency. Specifically, the second linear guide 207 is a high-strength linear guide.

[0044] Specifically, there can be multiple second pressure blocks 209. Multiple second pressure blocks 209 are arranged at intervals on one side of the second linear guide 207. The second linear guide 207 is laterally squeezed by multiple second pressure blocks 209 from different positions. The cooperation of multiple second pressure blocks 209 ensures that the second linear guide 207 has a high degree of straightness.

[0045] The miniature CNC lathe provided in this embodiment ensures the installation accuracy of the first linear guide 304 through the first pressure block 307 of the first linear guide module, reducing the possibility of bending or lateral deviation, and ensuring the feed accuracy of the tool holder 201 along the first direction. Similarly, the installation accuracy of the second linear guide 207 is ensured through the second pressure block 209 of the second linear guide module, reducing the possibility of bending or lateral deviation, and ensuring the feed accuracy of the tool holder 201 along the second direction. Thus, the two sets of linear guide modules provide smooth, low-friction bearing and guidance for the movement of the tool holder 201 in different directions, thereby improving the movement accuracy of the tool holder 201, ensuring good tool changing accuracy and efficiency, and ultimately improving the processing efficiency of the equipment.

[0046] like Figure 8 As shown, in some embodiments provided by this utility model, the X-axis feed module 200 further includes: a bellows cover 210, which is disposed between the X-axis drive unit 202 and the second support seat 205, and between the second support seat 205 and the first support seat 303. The bellows cover 210 is configured as a foldable flexible component.

[0047] In this embodiment, to address the potential generation of ribbon-like or granular chips and splashing coolant during machining, a flexible, folding bellows cover 210 is installed above the guide transmission area of ​​the X-axis feed module 200. Specifically, above the core guide and transmission area of ​​the feed mechanism, between the X-axis drive unit 202 and the second support seat 205, and between the second support seat 205 and the first support seat 303, a retractable bellows cover 210 is installed. This bellows cover 210 constructs a dynamic sealing barrier, achieving dynamic sealing protection for the core transmission components. This cuts off the path of chips entering the ball screw circulation channel, ensuring the operational accuracy of the entire feed system and effectively extending the service life of the entire machine. Furthermore, the bellows cover 210 can also be mounted on the support platform 206. Specifically, the X-axis screw 203 and the second linear guide are covered with folding bellows protective covers.

[0048] like Figure 2 and Figure 3 As shown, in some embodiments of this utility model, the X-axis feed module 200 further includes a second mounting base 211. The X-axis drive unit 202 and the X-axis lead screw are mounted on the first support base via the second mounting base 211. That is, the second mounting base 211 can support the drive ends of the X-axis drive unit 202 and the X-axis lead screw, which helps to simplify the structure. The second mounting base 211 can be a flange seat, a mounting platform, or other structures. Specifically, the second mounting base 211 is connected to the first support base 303 via a second screw 215. It can be understood that in some examples, the second mounting base 211 can also be connected to the support platform 206 via the second screw 215.

[0049] Among them, such as Figure 2 As shown, the X-axis feed module 200 also includes a second coupling 212, connecting the output shaft of the X-axis drive unit 202 and the X-axis lead screw 203. Specifically, the output shaft of the X-axis drive unit 202 passes through the first support 303 and extends into the interior of the first support 303, and is connected to the drive end of the X-axis lead screw 203 via the second coupling 212. The second coupling 212 can be a flexible coupling with a perforated joint, which can effectively absorb the vibration during high-frequency start-stop of the system and compensate for minor coaxiality assembly errors.

[0050] Among them, such as Figure 2 As shown, the X-axis feed module 200 also includes a first lead screw support 213, which is located inside the first bearing seat 303. The free end of the X-axis lead screw 203 is rotatably connected to the first lead screw support 213. That is, the extended optical axis end of the X-axis lead screw 203 passes through the securely installed first lead screw support 213 and, with the help of a bolt-connected bearing cover, can achieve precise radial and axial locking positioning of the X-axis lead screw 203, ensuring the dynamic stability of the X-axis lead screw 203 during high-speed rotation.

[0051] Specifically, such as Figure 6 and Figure 7 As shown, part of the housing of the X-axis drive unit 202 is connected to the first support base 303 by a first screw 214, the support platform 206 is connected to the first support base 303 by a third screw 216, and the tool holder 201 is connected to the second support base 205 by a fourth screw 218. The second mounting base 211 is connected to the first support base 303 or the support platform 206 by a second screw 215; the bellows cover 210 is connected to the first support base 303 by a second bolt 219, and the second support base 205 is connected to the X-axis nut 204 by a first bolt 217.

[0052] like Figure 1 and Figure 9 As shown, in some embodiments provided by this utility model, the micro CNC lathe further includes: a spindle box module 400, which includes a box body 401, a spindle drive unit 402, a spindle 403, and a chuck 404. The box body 401 is installed on the top of the bed body 100 on the side away from the X-axis feed module 200. The spindle drive unit 402 is installed on the outside of the box body 401. The chuck 404 is installed on the side of the spindle box 403 facing the X-axis feed module 200. The spindle 403 is connected to the spindle drive unit 402 and the chuck 404 by the internal power of the box body 401.

[0053] The housing body 401 provides reliable support for the spindle 403, spindle drive unit 402, and chuck 404. The housing body 401 is mounted on the top of the bed body 100 along a first direction and positioned away from the X-axis feed module 200. The chuck 404 is mounted on the side of the housing body 401 facing the X-axis feed module 200. This design allows the housing body 401 and the X-axis feed module 200 to make efficient use of the space at the top of the bed body 100 and provides movement space for the X-axis feed module 200 as it moves with the Z-axis feed module 300. This achieves the design requirements of a compact layout and small size, and also improves tool changing efficiency. Specifically, the housing body 401 is securely mounted on the top left side of the bed body 100, and the X-axis feed module 200 is located on the right side of the housing body 401.

[0054] The spindle drive unit 402 is mounted on the outside of the housing body 401, facilitating maintenance operations on the spindle drive unit 402 from outside the housing body 401 and improving the convenience of maintenance operations. At least a portion of the spindle 403 is located inside the housing body 401, which provides good protection for the spindle 403 and helps to extend the service life of the spindle 403.

[0055] A high-precision chuck 404 is securely connected to the front flange of the spindle 403. The chuck 404 is used to clamp precision workpieces. When the spindle drive unit 402 operates, it drives the chuck 404 to rotate via the spindle 403. That is, the chuck 404 rotates synchronously and at high speed with the spindle 403, thereby enabling precise coaxial clamping of the workpiece.

[0056] like Figure 10 , Figure 11 As shown, in some embodiments of this utility model, the spindle box module 400 further includes a transmission mechanism. The end of the spindle 403 away from the chuck 404 passes through the box body 401 and is poweredly connected to the spindle drive unit 402 through the transmission mechanism. The transmission mechanism can transmit the torque and speed of the spindle drive unit 402, drive the spindle 403 to rotate, and realize speed change. Specifically, the transmission mechanism can be a belt drive, gear drive, or other transmission mechanism to meet the needs of different positions of the output shaft of the spindle 403 and the spindle drive unit 402.

[0057] Furthermore, such as Figure 10 , Figure 11 As shown, the transmission mechanism includes a drive pulley 409, a timing pulley 410, and a belt 411. The drive pulley 409 is connected to the output shaft of the spindle drive unit 402, and the timing pulley 410 is connected to the spindle 403. The belt 411 is wound around the drive pulley 409 and the timing pulley 410, and the diameter of the timing pulley 410 is larger than the diameter of the drive pulley 409. That is, the output shaft of the spindle drive unit 402 is poweredly connected to the spindle 403 through a belt drive mechanism. This arrangement not only achieves smooth power transmission but also effectively buffers cutting impacts when machining hard materials, protecting the spindle drive unit 402 from damage caused by rigid overload. Because the diameter of the timing pulley 410 is larger than the diameter of the drive pulley 409, speed changes can be achieved, such as reducing speed and increasing torque.

[0058] Specifically, such as Figure 10 , Figure 11 , Figure 13 As shown, the spindle drive unit 402 is a 400W servo motor, which is securely mounted to the rear or side of the main body 401 via a motor flange bracket 412. The transmission mechanism employs a flexible noise reduction scheme. A small-diameter drive pulley 409 is fixed to the output shaft of the spindle drive unit 402 using slotted flat-end set screws, while a large-diameter synchronous pulley 410 is mounted at the very end of the spindle 403. The drive pulley 409 and the synchronous pulley 410 are connected by a high-strength belt 411. Thus, the rotational power of the output shaft of the spindle drive unit 402 is transmitted to the chuck 404 after being reduced in speed and torque by the belt 411, ultimately completing the efficient rotary turning operation on the workpiece.

[0059] Furthermore, such as Figure 1As shown, the spindle drive unit 402 is located on one side of the housing body 401 along the second direction. In this case, the spindle drive unit 402 and the Z-axis drive unit 301 can be located on opposite sides of the housing body 401. The X-axis drive unit 202 can be located on the same side of the housing body 401 as the spindle drive unit 402. Alternatively, the spindle drive unit 402 can also be located on the side of the housing body 401 away from the chuck 404.

[0060] like Figure 9 and Figure 10 As shown, in some embodiments provided by this utility model, the spindle box module 400 further includes: an angular contact ball bearing 405, the portion of the spindle 403 away from the chuck 404 being rotatably connected to the box body 401 via the angular contact ball bearing 405; a double-row angular contact ball bearing 406, the portion of the spindle 403 near the chuck 404 being rotatably connected to the box body 401 via the double-row angular contact ball bearing 406; a front bearing cover 407, connected to the box body 401, configured to cover the double-row angular contact ball bearing 406 and limit the movement of the double-row angular contact ball bearing 406; and a rear bearing cover 408, connected to the box body 401, configured to cover the angular contact ball bearing 405 and limit the movement of the angular contact ball bearing 405.

[0061] Specifically, within the precision inner cavity of the housing body 401, the front end of the spindle 403 (i.e., the end near the chuck 404) is fitted with a high-load-bearing double-row angular contact ball bearing 406 with dust covers on both sides. This double-row angular contact ball bearing 406 is rotatably connected to the inner wall of the housing body 401 to resist the combined radial and axial forces during cutting. The rear end of the spindle 403 (i.e., the end away from the chuck 404) is fitted with an angular contact ball bearing 405, which is rotatably connected to the inner wall of the housing body 401. To seal the bearing cavity and provide axial restraint, a front bearing cover 407 and a rear bearing cover 408 are respectively locked at the front and rear ends of the housing body 401.

[0062] In some embodiments of this invention, a locking nut is screwed onto the end of the spindle 403 away from the chuck 404. During assembly, tightening the locking nut establishes a closed-loop axial pressure, applying preload to the front and rear bearing assemblies (i.e., double-row angular contact ball bearings 406 and angular contact ball bearings 405), thereby completely eliminating the rotational backlash of the spindle 403 system.

[0063] like Figure 12 As shown, in some embodiments provided by this utility model, the top of the box body 401 is a dome structure and the side wall of the box body 401 is a straight wall structure. The dome structure can alleviate the local stress peak under high-speed alternating load, and the straight wall structure can reliably support the dome structure, thereby improving the reliability of the box body 401 and facilitating the assembly of the spindle 403.

[0064] Among them, such as Figure 9 As shown, the spindle 403 is configured with a stepped structure. The diameter of the spindle 403 decreases step by step from the direction closer to the chuck 404 to the direction farther away from the chuck 404. That is, the stepped spindle has a stepped topology distribution with the diameter decreasing step by step from the direction closer to the chuck 404 to the direction farther away from the chuck 404. This configuration makes the front end of the spindle 403 have high rigidity and good bending resistance, and it is not easy to deform during cutting, thus ensuring machining accuracy.

[0065] Furthermore, the dome-shaped straight-walled box body 401 is combined with the closed-loop pre-tightening structure of the stepped spindle to alleviate the local stress peak under high-speed alternating loads by utilizing the dome, and is locked by the precision round nut at the tail of the spindle 403 to establish axial closed-loop pressure transmission, which can effectively eliminate the original clearance of the bearing system.

[0066] Specifically, such as Figure 12 As shown, the chuck 404 is connected to the spindle 403 via an intermediate connecting structure. Specifically, the chuck 404 is mounted to the intermediate connecting structure via a fifth screw 413, and the intermediate connecting structure is mounted to the spindle 403 via a sixth screw 414. At least a portion of the housing of the spindle drive unit 402 is connected to the housing body 401 via a seventh screw 415.

[0067] Furthermore, the assembly and working principle of the miniature CNC lathe provided in this embodiment are as follows: During the lathe assembly and positioning stage, the first linear guide 304 is placed in the first mounting slot of the bed body. First, a wedge-shaped first pressure block 307 is installed on the outside of the first linear guide 304. The position of the first pressure block 307 is adjusted downwards using a first adjusting member. If the first adjusting member is a screw, the vertical screw of the first pressure block 307 is tightened downwards, causing the first wedge-shaped surface of the first pressure block 307 to engage with the first inclined surface of the first mounting slot. Utilizing the principle of force amplification by the inclined surface, a lateral thrust is generated, uniformly and firmly pressing the first linear guide 304 against the side wall of the first mounting slot of the bed body 100. After confirming a 100% seamless fit on the side of the first linear guide 304, the first connecting member 306 is used to fix the first linear guide 304 to the bed body 100. If the first connecting member 306 is a screw, the main fixing screw at the top of the first linear guide 304 is tightened to eliminate human positioning errors. Understandably, the second linear guide 207 of the X-axis feed module 200 is fixed in the same way, which will not be described in detail here.

[0068] During operation, the system issues commands, and the Z-axis drive unit 301 of the Z-axis feed module 300 drives the 1204 lead screw (i.e., Z-axis lead screw 302) directly via the flange for longitudinal high-load feed; the X-axis drive unit 202 of the X-axis feed module 200 achieves mechanical speed reduction and torque increase through the 0802 lead screw (i.e., X-axis lead screw 203) with a lead of only 2mm, driving the second bearing seat 205 for high-resolution transverse feed. The cutting and vibration forces generated during machining are vertically transmitted through the dome-shaped straight wall of the box body to the bed body 100 with reinforcing ribs 102. The first-order natural frequency of the bed body 100, which is as high as 451.39Hz, is used to avoid the resonance range and ensure smooth cutting.

[0069] Specifically, the miniature CNC lathe provided in the embodiment of this utility model has its overall dimensions strictly enclosed within a rectangular space of 600mm in length, 200mm in width, and 325mm in height, with the center height of the spindle 403 set at 112mm.

[0070] The miniature CNC lathe provided in this embodiment of the invention has the following advantages compared with the prior art: 1. The internal hollowing of the main body 100 and the topological structure design of the reinforcing ribs 102, while ensuring the maximum table size, allows for precise cutting of materials in the non-load-bearing area, and at the same time significantly improves the bending and torsional moment of inertia of the bed cross section, achieving a balance between lightweight and high rigidity.

[0071] 2. By using wedge-shaped pressure plates to assist in the assembly of linear guideways, the traditional extensive mode of relying on hole position allowance for positioning is broken. Instead, a physical hard-limit assembly process of "first positioning by lateral inclined extrusion, and then vertical locking at the top" is adopted, which ensures the absolute straightness of the initial installation of the guideways of the micro CNC lathe from the source.

[0072] 3. The side-mounted layout and the dynamic matching of the micro-lead ball screw, the Z-axis drive unit 301 is directly connected to the side, which greatly shortens the overall length of the lathe and lowers the center of gravity. The X-axis feed module 200 uses a 2mm lead to exert a mechanical speed reduction and torque increase effect like "shifting to first gear", so that even a small power motor can generate strong anti-cutting thrust.

[0073] 4. The dome-shaped straight-walled box body 401 and the stepped spindle closed-loop pre-tightening structure utilize the dome to alleviate the local stress peak under high-speed alternating loads, and are locked by the precision round nut at the tail of the spindle 403 to establish axial closed-loop pressure transmission, completely eliminating the original clearance of the bearing system.

[0074] Thus, through the core design of integrated lightweight bed topology optimization and precision assembly of wedge-shaped pressure plates, and coordinated dynamic matching of the spindle 403 structure and the feed system, a breakthrough was achieved in the simultaneous improvement of geometric accuracy, dynamic rigidity, and overall energy efficiency of the desktop lathe. The scientifically reinforced 102 bed structure boosts the first-order natural frequency to 451.39Hz, completely eliminating the possibility of resonance with the fundamental rotational frequency of the spindle 403. The innovative wedge-shaped pressure block installation process utilizes structural mechanics to eliminate random errors from manual assembly, greatly ensuring the accuracy of the guideways. The side-mounted servo motor directly connected to the 1204 miniature lead screw saves equipment space while providing the system with excellent dynamic response and overload resistance. Ultimately, this device not only reduces manufacturing costs but also fills the technological gap in miniature, high-precision, and high-rigidity CNC machining equipment for desktop environments, making it suitable for widespread application.

[0075] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this utility model is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0076] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the present invention, and all of these forms are within the protection scope of the present invention.

Claims

1. A miniature CNC lathe, characterized in that, include: The bed body is a one-piece structure, including a hollow cavity and reinforcing ribs located inside the cavity. A first mounting groove is provided on the top of the bed body, and the groove wall of the first mounting groove is provided with a first inclined surface. The X-axis feed module is located above the main body of the bed and is connected to the tool post; The Z-axis feed module includes a Z-axis drive unit, a Z-axis lead screw, a Z-axis nut, and a first bearing seat, all disposed on the side of the bed body. The Z-axis lead screw extends along a first direction and is poweredly connected to the Z-axis drive unit. The Z-axis nut is threadedly connected to the Z-axis lead screw and connected to the first bearing seat. The X-axis feed module is mounted on the first bearing seat. The Z-axis feed module further includes a first guide rail module, which includes a first linear guide rail, a first slider, a first connector, a first pressure block, and a first adjusting member. The bottom end of the first linear guide rail is accommodated in the first mounting groove. The first pressure block is located between the first linear guide rail and the first inclined surface and is provided with a first wedge-shaped surface that matches the first inclined surface. The first adjusting member passes through the first pressure block and is connected to the bed body to adjust the position of the first pressure block and the bottom of the first mounting groove. The first connector connects the first linear guide rail and the bed body. The first slider is slidably connected to the first linear guide rail and connected to the first bearing seat.

2. The micro CNC lathe according to claim 1, characterized in that, The Z-axis feed module also includes: The first mounting base is used to mount the Z-axis drive unit and the Z-axis lead screw to the bed body. The first coupling connects the output shaft of the Z-axis drive unit to the Z-axis lead screw. The second lead screw support seat and the first mounting seat are located on the same side of the bed body, and the free end of the Z-axis lead screw is rotatably connected to the second lead screw support seat. The first connecting seat connects the Z-axis nut and the first bearing seat.

3. The micro CNC lathe according to claim 1, characterized in that, The X-axis feed module includes: The X-axis drive unit is mounted on one end of the first support base along a second direction, the second direction being perpendicular to the first direction; An X-axis lead screw extends along a second direction and is disposed inside the first bearing seat; the X-axis lead screw is poweredly connected to the X-axis drive unit. The X-axis nut is threadedly connected to the X-axis lead screw and connected to the second bearing seat, and the tool holder is mounted on the second bearing seat.

4. The micro CNC lathe according to claim 3, characterized in that, The X-axis feed module also includes: A support platform is installed inside the first bearing seat. The support platform is provided with a second mounting groove, and the groove wall of the second mounting groove is provided with a second inclined surface. The second guide rail module includes a second linear guide rail, a second slider, a second connector, a second pressure block, and a second adjusting member. The bottom end of the second linear guide rail is accommodated in the second mounting groove. The second pressure block is located between the second linear guide rail and the second inclined surface and is provided with a second wedge-shaped surface that matches the second inclined surface. The second adjusting member passes through the second pressure block and is connected to the support platform to adjust the position of the second pressure block relative to the bottom of the second mounting groove. The second connector connects the second linear guide rail and the support platform. The second slider is slidably connected to the second linear guide rail and is connected to the second bearing seat.

5. The micro CNC lathe according to claim 4, characterized in that, The X-axis feed module also includes: An accordion cover is disposed between the X-axis drive unit and the second support, and between the second support and the first support, and the accordion cover is configured as a foldable flexible component.

6. The micro CNC lathe according to claim 4, characterized in that, The X-axis feed module also includes: The second mounting base is used to mount the X-axis drive unit and the X-axis lead screw to the first bearing base, and the output shaft of the X-axis drive unit passes through the first bearing base and extends into the interior of the first bearing base. The second coupling connects the output shaft of the X-axis drive unit and the X-axis lead screw. The first lead screw support is located inside the first bearing seat, and the free end of the X-axis lead screw is rotatably connected to the first lead screw support.

7. The miniature CNC lathe according to claim 1, characterized in that, Also includes: The spindle box module includes a box body, a spindle drive unit, a spindle, and a chuck. The box body is mounted on the top of the bed body on the side away from the X-axis feed module. The spindle drive unit is mounted on the outside of the box body. The chuck is mounted on the side of the box body facing the X-axis feed module. The spindle is connected to the spindle drive unit and the chuck by an internal power source in the box body.

8. The micro CNC lathe according to claim 7, characterized in that, The spindle box module also includes: The transmission mechanism has the end of the main shaft away from the chuck passing through the main body of the housing and being poweredly connected to the main shaft drive unit through the transmission mechanism; An angular contact ball bearing is used, and the portion of the main shaft away from the chuck is rotatably connected to the housing body via the angular contact ball bearing; A double-row angular contact ball bearing is used, and the portion of the main shaft near the chuck is rotatably connected to the housing body via the double-row angular contact ball bearing. The front bearing cover is connected to the housing body and is configured to cover the double-row angular contact ball bearing and limit the movement of the double-row angular contact ball bearing; The rear bearing cover is connected to the main body of the housing and is configured to cover the angular contact ball bearing and limit the movement of the angular contact ball bearing.

9. The micro CNC lathe according to claim 8, characterized in that, The transmission mechanism includes: The system includes a drive pulley, a timing pulley, and a belt. The drive pulley is connected to the output shaft of the main shaft drive unit, the timing pulley is connected to the main shaft, and the belt is wound around the drive pulley and the timing pulley. The diameter of the timing pulley is larger than the diameter of the drive pulley.

10. The micro CNC lathe according to claim 8, characterized in that: The top of the main body of the box is a dome structure, and the side walls of the main body of the box are straight walls. The spindle is configured with a stepped structure, and the diameter of the spindle decreases gradually from the direction of approaching the chuck to the direction of moving away from the chuck. A locking nut is screwed onto the end of the spindle away from the chuck.

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