Machine tool base driven by linear motor

Abstract

The utility model discloses a machine tool base driven by a linear motor, belongs to the field of numerical control machining, and aims to solve the problem that transient electromagnetic force and mechanical impact generated when the linear motor moves at a high speed can induce vibration of an internal structure of the machine tool base and other connecting parts, and consequently machining precision is affected. The key points of the technical scheme are as follows: the base comprises an axial base and a substrate base, the axial base is connected with the substrate base, and a hollow groove is formed in the connecting surface of the substrate base and the axial base. According to the utility model, the natural marble and the FC300 casting are compositely applied to form high-frequency (gt; according to the invention, a low-frequency (1000 Hz) and low-frequency (80-120 Hz) vibration decoupling mechanism is adopted, processing vibration and basic vibration do not interfere with each other through a modal isolation belt, the contact rigidity is reduced by 60% through the design of a hollow groove, and the thermal deformation control efficiency is remarkably improved by matching with a symmetrical thermal expansion structure, so that the vibration control is enhanced, and the processing precision is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining, and more specifically, it relates to a machine tool base driven by a linear motor. Background Technology

[0002] The machine tool base, as the "foundation" of the machine tool, is a core component that ensures machining accuracy and stability, and its function spans the entire lifecycle of the machine tool, from design and operation to maintenance. Currently, linear motor-driven machine tools are widely used in the field of precision machining due to their advantages such as high dynamic response and high acceleration.

[0003] However, the transient electromagnetic forces and mechanical shocks generated by linear motors during high-speed motion can induce vibrations in the internal structure of the machine tool base and its connecting components, especially at high frequencies, which can easily lead to structural resonance. These vibrations are transmitted to the machining area through the machine tool body, causing a slight shift in the relative position between the workpiece and the cutting tool, directly affecting the surface quality and dimensional accuracy of the machined parts, which is particularly prominent in ultra-precision applications such as semiconductor manufacturing and optical component processing.

[0004] Therefore, a new solution is needed to address this problem. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a linear motor driven machine tool base to solve the above-mentioned problems.

[0006] The present invention achieves the above objectives through the following technical solution: a linear motor driven machine tool base, comprising an axial base and a base base, wherein the axial base is connected to the base base, and a hollow groove is provided on the connection surface between the base base and the axial base.

[0007] The present invention is further configured such that: there are eight hollowed-out grooves, and the eight hollowed-out grooves are distributed in a distribution structure of "dispersed around the perimeter and sparse in the middle".

[0008] The present invention is further configured such that: the bottom of the base is configured as a sealed structure, and a vibration-absorbing material layer is placed inside the base.

[0009] The present invention is further configured such that: an axial platform is provided on the axial base, a motor magnetic plate mounting seat is provided at the middle position of the axial platform, and axial linear guide rails are symmetrically arranged on both sides of the motor magnetic plate mounting seat on the axial platform.

[0010] The present invention is further configured such that: an annular oil passage groove is provided on the axial platform, and an oblique oil guide hole is provided on the axial base that passes through the axial platform and communicates with the annular oil passage groove.

[0011] The present invention is further configured such that: a wire-passing groove is provided on the side of the base, a wire-passing channel is provided on the axial base to connect with the wire-passing groove, and the wire-passing opening of the axial platform is configured as a volcano-shaped protrusion structure at the wire-passing opening of the wire-passing channel.

[0012] The present invention is further configured such that the base is provided with a number of thickened ribs.

[0013] The present invention is further configured such that: the axial base is made of natural marble, and the base is made of FC casting.

[0014] The present invention is further configured such that: the axial base is provided with chip removal grooves on both sides of the axial platform, and the chip removal grooves are inclined.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Firstly, by combining natural marble with FC300 castings, a decoupling mechanism for high-frequency (>1000Hz) and low-frequency (80-120Hz) vibrations is formed. The modal isolation zone ensures that the processing vibration and the basic vibration do not interfere with each other. The hollow groove design reduces the contact stiffness by 60%. Combined with the symmetrical thermal expansion structure, the efficiency of thermal deformation control is significantly improved, thereby effectively enhancing the vibration control and improving the processing accuracy.

[0017] Secondly, the double-layer structure increases the first-order bending mode frequency of the axial base from 300Hz to 450Hz, and optimizes the first-order mode frequency of the base from 50Hz to 80Hz, improving the dynamic response speed by 40%-60%. The centrally located magnetic plate of the linear motor improves the uniformity of the magnetic field distribution, reduces the movement deviation, and improves the positioning accuracy, thereby enhancing the dynamic performance and effectively improving the machining accuracy.

[0018] Third, the natural marble crystalline structure offsets 85% of the normal suction force. Combined with the vibration attenuation characteristics of the graphite layer in the FC300 casting, the overall vibration resistance is improved by more than 60% compared with the traditional design. The composite vibration-absorbing material layer achieves a 75% reduction in vibration transmission rate, significantly enhancing structural stability. Thus, the enhanced vibration resistance and stability effectively improve processing accuracy.

[0019] Fourth, through systematic innovation in materials, structure, and function, this application design has achieved multi-dimensional breakthroughs in vibration control, dynamic performance, stability, lifespan, assembly efficiency, and material utilization, and has significant engineering application value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0021] Figure 2This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the base structure.

[0023] Reference numerals: 1. Axial base; 2. Base base; 3. Hollowed-out groove; 4. Vibration-absorbing material layer; 5. Axial platform; 6. Motor magnetic plate mounting seat; 7. Axial linear guide rail; 8. Annular oil passage groove; 9. Inclined oil guide hole; 10. Thickened rib; 11. Wire passing groove; 12. Wire passing channel; 13. Chip removal groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Example

[0025] A linear motor driven machine tool base, such as Figures 1-3 As shown, it includes an axial base 1 and a base base 2. The axial base 1 is made of natural marble. The compressive strength of natural marble is generally between 100-150MPa. Combined with the characteristics of granite, it forms a stable triangular support structure, which improves the deformation resistance by more than 60% compared with the traditional cast base. This gives the axial base 1 the characteristics of high rigidity support. In addition, the uniform grain structure of natural marble can disperse the magnetic lines of the linear motor. Actual tests show that it can cancel 85% of the normal attraction force and prevent the axial base 1 from shifting.

[0026] The base 2 is made of FC300 casting. FC300 has a tensile strength ≥600MPa and a hardness of 187-241HB, providing good support and being easy to process and form. The microstructure of pearlitic gray cast iron allows the graphite layer to dissipate vibration energy upon impact. Experiments show that the vibration decay time is shortened to 1 / 3 of that of traditional materials, effectively absorbing vibration using its shock absorption and damping properties. Simultaneously, normalizing treatment at 530-550℃ for 4-6 hours eliminates internal stress, improving the flatness retention of the base 2 by 40%.

[0027] like Figures 1-2 As shown, the axial base 1 is connected to the base base 2, forming a double-layer structure design in which the axial base 1 and the base base 2 work together. The natural marble material has a natural frequency higher than 1000Hz, and mainly responds to high-frequency vibrations such as cutting force impact. The bottom of the base base 2 is set as a sealed structure, and several thickened ribs 10 are set inside with a diameter increased by 30%, thereby reducing the natural frequency to 80-120Hz, and thus absorbing low-frequency vibrations such as transportation bumps and ground vibrations.

[0028] Finite element simulation shows that the double-layer structure increases the first-order bending mode frequency of the axial platform from the traditional 300Hz to 450Hz, and optimizes the first-order mode frequency of the base platform from 50Hz to 80Hz, forming a modal isolation zone. This double-layer structure decouples the high-frequency processing vibration from the low-frequency foundation vibration.

[0029] like Figure 3 As shown, the base 2 and the axial base 1 are connected by a hollowed-out groove 3. The hollowed-out groove 3 reduces the contact area and cuts off the vibration transmission path. At the same time, the hollowed-out groove 3 has eight contact stiffnesses that are reduced by 60%. The eight hollowed-out grooves 3 are distributed in a "dispersed around the perimeter and sparse in the middle" distribution structure. The eight hollowed-out grooves 3 are symmetrically arranged along the center line of the length direction of the base 2, thus forming a symmetrical thermal expansion structure design, which effectively controls the thermal deformation of the base 2 and is superior to ordinary designs.

[0030] like Figure 3 As shown, a vibration-absorbing material layer 4 is placed inside the base 2. The vibration-absorbing material layer 4 is made of natural marble. The density of the natural marble is 2.7g / cm³. It forms a composite vibration-absorbing structure with the damping characteristics of FC300. Experiments show that the vibration transmission rate is reduced by 75%.

[0031] like Figures 1-2 As shown, an axial platform 5 is provided on the axial base 1. A motor magnetic plate mounting seat 6 is provided in the middle of the axial platform 5. Axial linear guide rails 7 are symmetrically arranged on both sides of the motor magnetic plate mounting seat 6. The central design of the motor magnetic plate mounting seat 6 ensures a uniform magnetic field distribution of the linear motor magnetic plate, which helps to reduce the fluctuation and deviation of the mover during movement, improves the positioning accuracy and stability of the platform, and concentrates all key components in one position, reducing the complexity of wiring and connection, making the structure of the entire linear motor system more compact and modular. This design facilitates installation and maintenance.

[0032] At the same time, such as Figure 2As shown, an annular oil groove 8 is provided on the axial platform 5. The characteristic of natural marble with a water absorption rate of <0.5% combined with the annular oil groove can prevent coolant penetration and extend the life of the guide rail by 30%-50%. At the same time, an inclined guide hole 9 is provided on the axial base 1, which passes through the axial platform 5 and connects to the annular oil groove 8, so as to realize the dynamic balance of lubricating oil and reduce the wear rate of the guide rail by 60%.

[0033] like Figure 2 As shown, the base 2 has a cable tray 11 on its side, which is used to accommodate and fix the cables and pipes inside the machine tool base. This facilitates the concealment of the cables and avoids interference between the cables and hydraulic pipes through the compartment design, thereby improving assembly efficiency. It also achieves separation of strong and weak currents, improves wiring efficiency by 70%, and reduces electromagnetic interference by 40%.

[0034] like Figures 1-2 As shown, the axial base 1 is provided with a wire passage 12 that connects to the wire passage groove 11, and the axial platform 5 is set with a volcano protrusion structure at the wire passage opening of the wire passage 12 with a protrusion height of 15mm, which effectively blocks the cutting fluid. Experiments show that the failure rate is reduced by 80%.

[0035] like Figures 1-2 As shown, the axial base 1 is provided with chip removal grooves 13 on both sides of the axial platform 5. The chip removal grooves 13 are inclined and the impurities formed during processing are discharged through the chip removal grooves 13 to avoid the problem of internal waste accumulation.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A machine tool base driven by a linear motor, characterized in that: It includes an axial base (1) and a base base (2), the axial base (1) is connected to the base base (2), and the connecting surface of the base base (2) and the axial base (1) is provided with a hollow groove (3).

2. The linear motor driven machine tool base according to claim 1, characterized in that: The hollowed-out groove (3) has eight sections.

3. The linear motor driven machine tool base according to claim 1, characterized in that: The bottom of the base (2) is set as a sealed structure, and a vibration-absorbing material layer (4) is placed inside the base (2).

4. A linear motor driven machine tool base according to claim 1, characterized in that: An axial platform (5) is provided on the axial base (1). A motor magnetic plate mounting seat (6) is provided in the middle of the axial platform (5), and axial linear guide rails (7) are symmetrically arranged on both sides of the motor magnetic plate mounting seat (6) on the axial platform (5).

5. A linear motor driven machine tool base according to claim 4, characterized in that: The axial platform (5) is provided with an annular oil passage groove (8), and the axial base (1) is provided with an oblique oil guide hole (9) that passes through the axial platform (5) and connects to the annular oil passage groove (8).

6. A linear motor driven machine tool base according to claim 5, characterized in that: The base (2) has a wire-passing groove (11) on its side, and the axial base (1) has a wire-passing channel (12) that connects to the wire-passing groove (11). The axial platform (5) has a crater protrusion structure at the wire-passing opening of the wire-passing channel (12).

7. A linear motor driven machine tool base according to claim 1, characterized in that: The base (2) is provided with several thickened ribs (10).

8. A machine tool base driven by a linear motor according to claim 1, characterized in that: The axial base (1) is made of natural marble, and the base base (2) is made of FC300 casting.

9. A linear motor driven machine tool base according to claim 4, characterized in that: The axial base (1) is provided with chip removal grooves (13) on both sides of the axial platform (5), and the chip removal grooves (13) are inclined.

Images