Machine tool frame with force and heat uniformity characteristics, machining machine tool and workpiece machining method

Abstract

The present invention relates to a machine tool frame, a processing machine tool and a workpiece processing method with force and heat uniformity characteristics, belonging to the technical field of the structure of processing machine tools. It solves the problems in the prior art that the machine tool frame has poor force and heat symmetry and balance characteristics, weak structural rigidity and small strength. The present invention adopts a symmetrical design that can improve the environmental adaptability and stability of the machine tool, and a closed-frame machine tool structure with force and heat balance characteristics that can simplify the maintenance and cleaning work of the machine tool. The machine tool frame of the present invention adopts a closed integral frame structure, including four columns, four cross beams and a base.

Description

Technical Field

[0001] The present invention belongs to the technical field of the structure of processing machine tools, and particularly relates to a machine tool frame, a processing machine tool and a workpiece processing method with force and heat uniformity characteristics. Background Art

[0002] With the continuous development of the manufacturing industry, as the core equipment in the manufacturing process, the structure design of machine tools has evolved from the initial simple mechanical structure to the current high-precision, high-rigidity, and multi-functional structure design, greatly improving the performance of machine tools. The closed-frame machine tool structure can significantly enhance the rigidity and stability of machine tools. During the operation of machine tools, cutting forces, the gravity of the machine tool itself, and the heat generated by movement will all affect the machining accuracy and the service life of the machine tool. To achieve high-precision machining, it is necessary for the machine tool structure to effectively disperse cutting forces and heat, maintaining the stability and accuracy of the machine tool. Therefore, force and heat balance have become important considerations in the structure design of machine tools. As an important equipment in modern manufacturing, CNC machining centers have put forward higher requirements for the structure design of machine tools. To meet the machining requirements of high precision and high efficiency, a closed-frame machine tool structure with force and heat balance characteristics has emerged. With the development of the manufacturing industry, multi-spindle machining technology has been widely applied. Multi-spindle machining centers can simultaneously machine multiple workpieces, significantly improving production efficiency. However, multi-spindle machining has put forward higher requirements for the rigidity and stability of the machine tool structure. Summary of the Invention

[0003] In view of the above problems, the present invention provides a machine tool frame, a processing machine tool and a workpiece processing method with force and heat uniformity characteristics. It solves the problems of poor force and heat symmetry and balance characteristics, weak structural rigidity and small strength in the machine tool frame of the prior art. The present invention adopts a symmetric design that can improve the environmental adaptability and stability of the machine tool, and a closed-frame machine tool structure with force and heat balance characteristics that can simplify the maintenance and cleaning work of the machine tool.

[0004] The present invention provides a machine tool frame with force and heat uniformity characteristics, including a bed frame and a base; the bed frame is composed of column one, column two, column three, column four, crossbeam one, crossbeam two, crossbeam three, crossbeam four and the base; column one, column two, column three, column four, crossbeam one, crossbeam two, crossbeam three and crossbeam four are symmetrically arranged on the base; the bed frame and the base are integrally formed or assembled and formed;

[0005] Column one, column two, column three and column four are respectively arranged on the base; the top ends of each column are respectively and perpendicularly fixedly connected to two crossbeams.

[0006] Optionally, column one, column two, column three and column four are respectively arranged at the four corners of the base.

[0007] Optionally, rails are installed on column one, column two and / or column four.

[0008] Optionally, guide rails are installed on beam one, beam two, beam three and / or beam four.

[0009] Optionally, the base includes a heat dissipation system, a chip removal system and / or a shock absorbing support device.

[0010] Another aspect of the present invention discloses a processing machine tool, including the aforementioned machine tool frame with uniform mechanical and thermal characteristics, and also includes a rotary worktable, two machine tool spindles and two sets of five-axis motion components; the two sets of five-axis motion components are arranged on the machine tool frame.

[0011] Optionally, the two machine tool spindles are respectively arranged on two groups of five-axis motion components.

[0012] Optionally, two sets of five-axis motion components are both arranged on the top surface of the track mounting frame.

[0013] The third aspect of the present invention further discloses a workpiece processing method, which uses the aforementioned processing machine tool to process the workpiece to be processed.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] (1) The closed frame of the machine tool of the present invention adopts a fully enclosed design. By integrally forming or by separately forming the columns, beams and base and then welding them together, the gaps between the various parts of the machine tool are minimized, effectively blocking the intrusion of external pollutants. This design greatly simplifies the maintenance and cleaning of the machine tool, reduces the dependence on professional maintenance personnel, thereby improving the cleaning efficiency and significantly reducing maintenance costs. More importantly, it can also effectively isolate the influence of the external environment on the interior of the machine tool, such as temperature fluctuations, humidity changes, etc., providing a stable internal environment for high-precision processing, thereby improving processing accuracy and product quality.

[0016] (2) The closed frame of the machine tool of the present invention adopts a box-type design, which enables the machine tool to maintain stable performance and precision when bearing heavy loads or complex cutting tasks. Whether it is formed in one piece or formed separately and then welded by the column, beam and base, it can effectively disperse and withstand the cutting force. The box-type design enhances the stability and durability of the machine tool, and also makes the machine tool of the present invention show significant advantages in structural rigidity and strength, providing a solid guarantee for high-precision and high-efficiency processing. At the same time, this structural design also takes into account the dynamic characteristics and vibration control of the machine tool to ensure that stable processing accuracy can be maintained during high-speed operation.

[0017] (3) The closed frame of the machine tool of the present invention adopts a symmetric design, presenting the characteristic of mirror symmetry in geometric form. This design enables the forces borne by each symmetric part of the machine tool to balance and distribute evenly when the machine tool is subjected to external forces, effectively avoiding the stress concentration phenomenon caused by excessive force in a local area, and contributing to the extension of the service life of the machine tool. At the same time, this symmetric design also helps to achieve the force and heat balance of the machine tool, enabling the machine tool to effectively disperse the cutting force and heat during the machining process, maintaining the stability and precision of the machine tool, and further improving the machining quality and efficiency.

[0018] (4) The machine tool structure of the present invention can be used for various types of machine tools. The modular design has wide applicability. Users can choose to install it independently according to actual needs to achieve the free combination of various types of machine tools, such as single-spindle or multi-spindle horizontal, single-spindle or multi-spindle vertical, double-spindle vertical-horizontal conversion type, double-spindle one vertical and one horizontal type, etc., such as CNC machining centers. This flexibility not only meets the machining needs of different users but also endows the machine tool with high expandability, enabling it to easily adapt to future technological upgrades and transformations. Therefore, the machine tool structure of the present invention has broad application prospects and market potential and can meet various high-precision and high-efficiency machining requirements. Description of the Drawings

[0019] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention.

[0020] Figure 1 It is the front view of the machine tool frame with the characteristics of uniform force and heat of the present invention;

[0021] Figure 2 It is the front view of the machining machine tool of the present invention.

[0022] Reference Signs:

[0023] 2. Rotary table, 3. Workpiece to be machined, 4-1. X-axis moving part, 5-1. Y-axis moving part, 6-1. Z-axis moving part, 7-1. C-axis orthogonal swing head, 8-1. A-axis orthogonal swing head, 9-1. Machine tool spindle, 10-1. Machining tool, 11. Numerical control device, 12. Column 1, 13. Column 2, 14. Column 3, 15. Column 4, 16. Cross beam 1, 17. Cross beam 2, 18. Cross beam 3, 19. Cross beam 4, 20. Base. Detailed Description of the Invention

[0024] To more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. Additionally, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0025] A specific embodiment of the present invention, as Figure 1 - Figure 2 , discloses a machine tool frame with force and heat uniformity characteristics. The machine tool structure adopts a closed integral frame structure, including a bed frame and a base; the bed frame is composed of column one 12, column two 13, column three 14, column four 15, crossbeam one 16, crossbeam two 17, crossbeam three 18, crossbeam four 19, and base 20; column one 12, column two 13, column three 14, column four 15, crossbeam one 16, crossbeam two 17, crossbeam three 18, and crossbeam four 19 are symmetrically arranged on the base 20 as a whole and are of an integrally formed structure or an assembled structure.

[0026] Column one 12, column two 13, column three 14, and column four 15 are respectively arranged at the four corners of the base 20; the top ends of each column are respectively and perpendicularly fixedly connected to two crossbeams; guide rails and five-axis motion components are installed on column one 12, column two 13, column three 14, column four 15, crossbeam one 16, crossbeam two 17, crossbeam three 18, and crossbeam four 19 according to actual requirements.

[0027] Further, tracks are installed on column one 12, column two 13, and / or column four 15 for a machining center with a double spindle; tracks are installed on crossbeam one 16, crossbeam two 17, crossbeam three 18, and / or crossbeam four 19.

[0028] Further, the base 20 includes a heat dissipation system, a chip removal system, and a shock absorption support device, adopting a traditional design and emphasizing reliability and easy maintenance. The heat dissipation system achieves efficient heat dissipation through heat conduction and natural convection. The base material has good thermal conductivity to reduce the impact of heat accumulation on the stability of the machine tool; the chip removal system adopts an inclined channel design and relies on the action of gravity to naturally discharge chips, and the machining area can be kept clean by combining manual cleaning; the shock absorption support device takes elastic pads and a solid support structure as the core, can absorb operating vibrations and keep the base stable, and the support points are evenly distributed to adapt to the ordinary working environment. The overall design is simple and efficient, providing a solid guarantee for the accuracy and stability of the machine tool.

[0029] The present invention has good force, heat symmetry and balance characteristics, with strong structural rigidity and high strength. The symmetric design can improve the environmental adaptability and stability of the machine tool, and the enclosed design simplifies the maintenance and cleaning work of the machine tool. It can be used in single-spindle or multi-spindle horizontal, single-spindle or multi-spindle vertical, double-spindle vertical-horizontal conversion, double-spindle one vertical and one horizontal and other types of CNC machining centers. It has a wide range of application fields, achieving the requirements of stability, rigidity and machining accuracy during high-speed machining operation of the CNC machining center. It has good force, heat symmetry and balance characteristics, improves the machining production efficiency and machining accuracy of parts on the basis of ensuring the machining quality of parts, and can reduce the machining cost.

[0030] The present invention has a wide range of application fields and can be used in single-spindle or multi-spindle horizontal, single-spindle or multi-spindle vertical, double-spindle vertical-horizontal conversion, double-spindle one vertical and one horizontal and other types of CNC machining centers, etc.

[0031] On the other hand of the present invention, see Figure 2 , a machining machine tool is disclosed, which includes the machine tool frame with the above-mentioned force and heat uniformity characteristics, a rotary table 2, two machine tool spindles and two sets of five-axis motion components; a rotary table 2 is provided at the center of the bed frame, and the workpiece 3 to be machined is installed on the rotary table 2 through a fixture; the two sets of five-axis motion components are respectively arranged on the bed frame; the two machine tool spindles are respectively arranged on the two sets of five-axis motion components; machining tools 10-1 for machining on both sides of the workpiece to be machined are respectively installed at the ends of the two machine tool spindles.

[0032] Furthermore, the bed frame includes an operation platform and a track mounting frame; the track mounting frame includes a first side, a second side and a top surface; the operation platform is arranged at the bottom between the first side and the second side, and both the first side and the second side are perpendicular to the operation platform; two sets of tracks are symmetrically arranged on the first side, the second side and the top surface, and the tracks include Z-axis guide rails and / or X-axis guide rails; the two sets of Z-axis guide rails are arranged on the first side and / or the second side; the Z-axis guide rails are perpendicular to the operation platform; the top surface is arranged at the top between the first side and the second side, and two sets of X-axis guide rails are symmetrically arranged on the top surface; the X-axis guide rails are parallel to the operation platform.

[0033] The rotary table 2 is arranged at the center of the bed frame, and the workpiece 3 to be machined is installed on the rotary table 2 through a fixture; the two sets of five-axis motion components are both arranged on the tracks.

[0034] Furthermore, the five-axis motion component includes an X-axis motion part, a Y-axis guide rail, a Y-axis motion part, a Z-axis guide rail, a Z-axis motion part, a C-axis orthogonal swing head and an A-axis orthogonal swing head; the C-axis is the axis rotating around the Z-axis, and the A-axis is the axis rotating around the X-axis.

[0035] Further, both ends of the X-axis moving part 4-1 slide on the X-axis guide rail through sliders, and are driven by an X-axis servo drive device.

[0036] Two sets of Y-axis guide rails are arranged inside the X-axis moving part 4-1; the Y-axis moving part 5-1 slides on the Y-axis guide rail through a slider, and realizes gravity center drive through a Y-axis servo drive device.

[0037] Each of the Y-axis moving parts 5-1 is provided with 4 Z-axis guide rails in a square layout. The Z-axis moving part 6-1 slides on the Z-axis guide rail through a slider, and realizes gravity center drive through a Z-axis servo drive device.

[0038] A C-axis orthogonal swing head 7-1 is installed at the end of the Z-axis moving part 6-1, an A-axis orthogonal swing head 8-1 is installed on the C-axis orthogonal swing head 7-1, a machine tool spindle 9-1 is arranged on the A-axis orthogonal swing head 8-1, and a machining tool 10-1 for separately machining the workpiece to be machined is arranged at the end of the machine tool spindle 9-1.

[0039] Further, it further includes a numerical control device 11. Each axis moving part of the machine tool is driven by a servo drive amplifier and a feed servo motor, and is controlled by the numerical control device 11. The numerical control device 11 is used to input and control a numerical control program and separately control two sets of five-axis movement components, so as to realize synchronous or asynchronous machining of the workpiece to be machined by two machine tool spindles respectively.

[0040] Further, two sets of five-axis movement components are both arranged on two sets of tracks on the top surface of the track mounting frame; two machining tools 10-1 perform symmetric machining on both sides of the workpiece to be machined.

[0041] The double-spindle double-five-axis linkage high-speed and high-efficiency vertical machining center provided by the present invention, as Figure 2 shown, can realize synchronous machining of symmetric double spindles of the workpiece to be machined. The workpiece to be machined 3 is fixed on the rotary table 2 through a fixture. The machine tool spindles 9-1 respectively realize linear movement of a pair of machine tool spindles 9-1 in the X, Y, and Z axial directions of the machine tool and rotational movement around the Z and X axes through the machine tool X, Y, and Z axis axial moving parts and the C-axis orthogonal swing head and the A-axis orthogonal swing head, and realize double-five-axis linkage machining of the workpiece to be machined 3. The numerical control device 11 controls the numerical control machining program to realize the double-five-axis linkage movement of the machine tool, and further realizes synchronous symmetric milling machining of the two-side spindles of the workpiece to be machined 3 on the machine tool.

[0042] For a rotating workpiece with a rotating array feature, since machining can be performed simultaneously at both ends of the workpiece and the cutting forces exerted by the tool on both ends of the workpiece can be offset, the machining deformation of the workpiece can be reduced, and the machining quality and efficiency of the workpiece can be improved. For some workpieces with non-fully centrosymmetric rotating features, for example, the number of blades on a blisk is usually odd, that is, a non-fully centrosymmetric workpiece. Using the double-spindle and double-five-axis linkage high-speed and high-efficiency vertical machining center proposed by the present invention, the cutting forces on both sides of the blisk can also be offset to a certain extent during machining, thereby reducing the deformation caused by machining. Therefore, in order to achieve synchronous machining of rotating workpieces with odd or even numbers of rotating array features.

[0043] The third aspect of the present invention discloses a workpiece machining method, which uses the aforementioned linkage high-speed and high-efficiency vertical machining machine tool to machine a workpiece to be machined. The specific steps include:

[0044] Refer to Figure 2 , first, set the machine tool coordinate systems (X, Y, Z, A, and C axes) of the two sets of five-axis motion components and their respective corresponding workpiece coordinate systems as follows: The positive directions of the X1, Y1, and Z1 axes in the first set of machine tool coordinate system MCS 1 of the first set of five-axis motion components are the same as the positive directions of the X, Y, and Z axes respectively. The positive directions of the X2 and Y2 axes in the second set of machine tool coordinate system MCS 2 of the second set of five-axis motion components are opposite to the positive directions of the X and Y axes respectively, and the positive direction of the Z2 axis is the same as the positive direction of the Z axis. The positive directions of the coordinate axes WX1, WY1, and WZ1 of the workpiece coordinate system WCS 1 are the same as the positive directions of the X1, Y1, and Z1 axes respectively. The positive directions of the coordinate axes WX2, WY2, and WZ2 of the workpiece coordinate system WCS 2 are the same as the positive directions of the X2, Y2, and Z2 axes respectively. The coordinate system origins of WCS1 and WCS2 are jointly set at the rotation center of the annular symmetric workpiece.

[0045] Step 1: Establish a first transformation model for transforming the variable values in the first set of current machine tool coordinate system MCS 1 of the first set of five-axis motion components into the variable values under the coordinate transformation of the first set of current workpiece coordinate system WCS 1, and a first iterative inverse transformation model for the variable values in the first set of next-moment machine tool coordinate system MCS 1 of the first set of five-axis motion components; establish a second transformation model for transforming the variable values in the first set of current machine tool coordinate system MCS 1 of the first set of five-axis motion components into the variable values in the second set of current machine tool coordinate system MCS 2 of the second set of five-axis motion components, and a second iterative inverse transformation model for the variable values in the second set of next-moment machine tool coordinate system MCS 2 of the second set of five-axis motion components.

[0046] Specifically, the expression of the first transformation model is as follows:

[0047]

[0048] where represents the position coordinate component in the 1-axis direction of the tip point of the machining tool 1 under the first set of current workpiece coordinate systems WCS 1 T 1-axis direction component of the position coordinate of the tip point of the machining tool X 1; represents the position coordinate component in the 1-axis direction of the tip point of the machining tool 1 under the first set of workpiece coordinate systems WCS 1 T 1-axis direction component of the position coordinate of the tip point of the machining tool Y 1; represents the position coordinate component in the 1-axis direction of the tip point of the machining tool 1 under the first set of workpiece coordinate systems WCS 1 T 1-axis direction component of the position coordinate of the tip point of the machining tool Z 1; represents the position coordinate component in the 1-axis direction of the tool attitude of the machining tool 1 under the first set of workpiece coordinate systems WCS 1 T 1-axis direction component of the tool attitude of the machining tool X 1; represents the position coordinate component in the 1-axis direction of the tool attitude of the machining tool 1 under the first set of workpiece coordinate systems WCS 1 T 1-axis direction component of the tool attitude of the machining tool Y 1; represents the position coordinate component in the 1-axis direction of the tool attitude of the machining tool 1 under the first set of workpiece coordinate systems WCS 1 T 1-axis direction component of the tool attitude of the machining tool Z 1; represents the displacement of the first set of X-axis moving parts in the X 1-axis relative to its initial state; represents the displacement of the first set of Y-axis moving parts in the Y 1-axis relative to its initial state; represents the displacement of the first set of Z-axis moving parts in the Z 1-axis relative to its initial state; represents the X rotation angle of the axis rotating around the A 1-axis relative to its initial state; represents the C rotation angle of the axis rotating around the Z1-axis relative to its initial state; represents the T vector from any point on the 1-axis line to the tip point of the machining tool 1 when the tip point of the machining tool 1 coincides with the origin of the first set of current workpiece coordinate systems WCS 1 A with the T tip point of the machining tool YComponent in the 1-axis direction; Indicates the machining tool T When the tip point of the machining tool 1 coincides with the origin of the coordinate system of the first set of current workpiece coordinate systems WCS With any point on the 1-axis as the starting point A The vector with the tip point of the machining tool 1 as the end point in the T Component in the 1-axis direction; Z Indicates the machining tool When the tip point of the machining tool 1 of the first set of current workpiece coordinate systems coincides with T The origin of the coordinate system of 1 WCS With any point on the 1-axis as the starting point C The machining tool T The vector with the tip point of 1 as the end point in the X Component in the 1-axis direction; Indicates the machining tool T When the tip point of the machining tool 1 coincides with the first set of current workpiece coordinate systems WCS The origin of the coordinate system of 1 C With any point on the 1-axis as the starting point A The vector with any point on the 1-axis as the end point in the Y Component in the 1-axis direction.

[0049] The expression of the first iterative inverse transformation model is:

[0050] .

[0051] The expression of the second transformation model is:

[0052]

[0053]

[0054] Wherein, Indicates the coordinate of the tip point of the machining tool WCS 2 under the second set of workpiece coordinate systems T Of 2 X Component in the 2-axis direction; Indicates the second set of workpiece coordinate systems WCS Under 2, the machining tool T The coordinate of the tip point of 2 Y Component in the 2-axis direction; Indicates the second set of workpiece coordinate systems WCS Under 2, the machining tool T The coordinate of the tip point of 2 Z Component in the 2-axis direction; Indicates the second set of workpiece coordinate systems WCS Under 2, the tool machining T Of the tool attitude of 2X 2-axis direction component; Represents the second set of workpiece coordinate systems WCS 2-down machining tool T Tool attitude of 2 Y 2-axis direction component; Represents the second set of workpiece coordinate systems WCS 2-down machining tool T Tool attitude of 2 Z 2-axis direction component; B Represents the machining tool T The position point at the tip of the tool of 1 rotates around Y 1-axis to the machining tool at this time T When it rotates to the position point at the tip of the tool of 2, the angle turned.

[0055] The expression of the second inverse transformation model is:

[0056]

[0057] Among them, Represents the displacement of the second set of X-axis moving parts in X The displacement of the 2-axis relative to its initial state; Represents the displacement of the second set of Y-axis moving parts in Y The displacement of the 2-axis relative to its initial state; Represents the displacement of the second set of Z-axis moving parts in Z The displacement of the 2-axis moving mechanism relative to its initial state; Represents the rotation around X The 2-axis rotation of A The rotation radian of 2 relative to its initial state; Represents the rotation around the Z2-axis of C The rotation radian of the 2-axis relative to its initial state; Represents taking A Any point on the axis of the 2-axis as the starting point, the machining tool T The component of the vector with the tip of the tool of 2 as the end point in Y The 2-axis direction; Represents taking A Any point on the axis of the 2-axis as the starting point, the machining tool T The component of the vector with the tip of the tool of 2 as the end point in Z The 2-axis direction; Represents taking C Any point on the axis of the 2-axis as the starting point, the tool T The component of the vector with the tip of the tool of 2 as the end point in X The 2-axis direction; Represents taking C Any point on the axis of the 2-axis as the starting point, AThe component of the vector with an arbitrary point on the 2-axis as the end point in the Y 2 direction.

[0058] It can be understood that with A an arbitrary point on the 1-axis as the starting point, the component of the vector with the tip point of the machining tool T 1 as the end point in the Y 1 direction ; with A an arbitrary point on the 1-axis as the starting point, the component of the vector with the tip point of the machining tool T 1 as the end point in the Z 1 direction ; with C an arbitrary point on the 1-axis as the starting point, the component of the vector with the tip point of the machining tool T 1 as the end point in the X 1 direction ; with C an arbitrary point on the 1-axis as the starting point, A the component of the vector with an arbitrary point on the 1-axis as the end point in the Y 1 direction and with A an arbitrary point on the 2-axis as the starting point, the component of the vector with the tip point of the machining tool T 2 as the end point in the Z 2-axis direction ; with C an arbitrary point on the 2-axis as the starting point, the component of the vector with the tip point of the machining tool T 2 as the end point in the X 2-axis direction ; with C an arbitrary point on the 2-axis as the starting point, A the component of the vector with an arbitrary point on the 2-axis as the end point in the Y 2 direction are the fixed parameters of the double-spindle double-five-axis linkage high-speed and high-efficiency vertical machining center.

[0059] Step 2: Obtain the variable values under the coordinate transformation of the first set of workpiece coordinate systems under the first set of five-axis motion components at the initial moment; let WCS = 0, k = 0 represents the initial moment; k = 0 when

[0060] Step 3: Based on the first transformation model and the variable values of the first set of machine coordinate systems k 1 under the first set of five-axis motion components at the MCS th moment, obtain the first set of workpiece coordinate systems k at the WCSVariable values under the coordinate transformation of 1 and the second set of workpiece coordinate systems under the second set of five-axis motion components WCS Variable values under the coordinate transformation of 2;

[0061] Based on the first iterative inverse transformation model and the k first set of workpiece coordinate systems under the first set of five-axis motion components at the WCS th moment, obtain the variable values of each variable under the machine tool coordinate system of the first set of five-axis motion components at the k +1th moment;

[0062] Based on the second iterative inverse transformation model and the k workpiece coordinate systems under the second set of five-axis motion components at the WCS th moment, obtain the variable values of each variable under the machine tool coordinate system of the second set of five-axis motion components at the k +1th moment;

[0063] Step 4: The tool under the first set of five-axis motion components of the double-spindle double-five-axis linkage high-speed and high-efficiency vertical machining machine processes the workpiece to be machined 3 according to the k workpiece coordinate system at the WCS th moment and the variable values under the coordinate transformation of 1, and the tool under the second set of five-axis motion components processes the workpiece to be machined 3 according to the k workpiece coordinate system at the WCS th moment and the variable values under the coordinate transformation of 2;

[0064] Step 5: Judge whether k is greater than or equal to K , where K represents the maximum machining time when the machining machine processes the workpiece to be machined 3. If k is greater than or equal to K , obtain the machined workpiece. If k is less than K , let k = k +1, and return to Step 3.

[0065] Through the reasonable design of the tool and the tool path, the present invention can achieve symmetry or balance of the loads on the workpiece and the machine tool, improve the force characteristics of the machine tool, suppress the vibration of the machine tool, and reduce the machining deformation of the workpiece, thereby improving the machining efficiency of the machine tool and the machining quality of the parts.

[0066] The natural frequency analysis of the closed-frame machine tool structure with a symmetric design of the present invention is carried out below. A comparison is made between a general machine tool and the machine tool structure with a symmetric design adopted by the present invention. Referring to Table 1 - Table 2, it can be seen that in the application scenario of high-speed machining, the first natural frequency of the machine tool structure adopted by the present invention has increased by 45% compared with the general machine tool structure. It can be seen that the machine tool structure adopted by the present invention has better dynamic characteristics, can adapt to higher spindle speeds, and provides higher machining efficiency.

[0067] Table 1 Natural Frequencies of the Machine Tool Structure of the Present Invention

[0068]

[0069] Table 2 Natural Frequencies of the General Machine Tool Structure

[0070]

[0071] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A workpiece processing method, characterized in that: Use a processing machine tool to process the workpiece to be processed; The processing machine tool comprises a machine tool frame with uniform mechanical and thermal characteristics, and also comprises a rotary table, two machine tool spindles and two sets of five-axis motion components; the two sets of five-axis motion components are arranged on the machine tool frame; machining tools for machining on both sides of the workpiece to be machined are respectively installed at the ends of the two machine tool spindles; The machine tool frame with uniform force and heat characteristics includes a bed frame and a base; the bed frame is composed of column 1, column 2, column 3, column 4, crossbeam 1, crossbeam 2, crossbeam 3, crossbeam 4 and a base; column 1, column 2, column 3, column 4, crossbeam 1, crossbeam 2, crossbeam 3 and crossbeam 4 are symmetrically arranged on the base; the bed frame and the base are integrally formed or assembled; The first column, the second column, the third column and the fourth column are respectively arranged on the base; the top of each column is respectively vertically fixedly connected with two beams; the first column, the second column, the third column and the fourth column are respectively arranged at the four corners of the base; the track is installed on the first column, the second column and / or the fourth column; the guide rail is installed on the first beam, the second beam, the third beam and / or the fourth beam; The specific steps of workpiece processing are as follows: Step 1: Create the first set of five-axis motion components and set the first set of current machine tool coordinate system MCS 1, the variable values ​​are transformed into the first set of current workpiece coordinate system WCS The first transformation model of the variable value under the coordinate transformation of 1 and the first set of machine tool coordinate system at the next moment MCS 1; establish the first set of current machine tool coordinate systems under the first set of five-axis motion components; MCS The variable values ​​under 1 are transformed into the second set of current machine tool coordinate system under the second set of five-axis motion components MCS 2 and the second transformation model of the variable values ​​and the second set of machine tool coordinate systems at the next moment MCS 2. The second iterative inverse transformation model for each variable value under 2; The expression of the first transformation model is: in, Indicates the first set of current workpiece coordinate system WCS 1 machining tool T 1 The position coordinates of the tool tip X 1-axis direction component; Indicates the first set of workpiece coordinate system WCS 1 machining tool T 1 The position coordinates of the tool tip Y 1-axis direction component; Indicates the first set of workpiece coordinate system WCS 1 machining tool T 1 The position coordinates of the tool tip Z 1-axis direction component; Indicates the first set of workpiece coordinate system WCS 1 machining tool T 1. Tool posture X 1-axis direction component; Indicates the first set of workpiece coordinate system WCS 1 machining tool T 1. Tool posture Y 1-axis direction component; Indicates the first set of workpiece coordinate system WCS 1 machining tool T 1. Tool posture Z 1-axis direction component; Indicates that the first set of X-axis moving parts is X 1. The displacement of the axis relative to its initial state; Indicates that the first set of Y-axis moving parts is Y 1. The displacement of the axis relative to its initial state; Indicates that the first set of Z-axis moving parts is Z 1. The displacement of the axis relative to its initial state; Indicates winding X 1 axis rotation A 1 is the rotation angle relative to its initial state; Indicates the axis of rotation around the Z1 axis C 1 is the rotation angle relative to its initial state; Indicates machining tool T 1 Tool tip point and the first set of current workpiece coordinate system WCS 1 coincides with the origin of the coordinate system. A 1. Any point on the axis of the axis is used as the starting point, and the machining tool T 1 The vector with the tip of the knife as the end point is Y Component in the 1-axis direction; Indicates machining tool T 1 Tool tip point and the first set of current workpiece coordinate system WCS 1 coincides with the origin of the coordinate system. A 1. Any point on the axis of the axis is used as the starting point, and the machining tool T 1 The vector with the tip of the knife as the end point is Z Component in the 1-axis direction; Indicates machining tool T 1 The first set of current workpiece coordinate system of tool tip point and WCS 1 coincides with the origin of the coordinate system. C 1. Any point on the axis of the axis is used as the starting point, and the machining tool T 1 The vector with the tip of the knife as the end point is X Component in the 1-axis direction; Indicates machining tool T 1 Tool tip point and the first set of current workpiece coordinate system WCS 1 coincides with the origin of the coordinate system. C 1. Any point on the axis is the starting point. A The vector with any point on the axis as the end point is Y Component in the 1-axis direction; The expression of the second transformation model is: in, Indicates the second set of workpiece coordinate system WCS 2 lower processing tools T 2 The position coordinates of the tool tip X 2-axis direction components; Indicates the second set of workpiece coordinate system WCS 2 lower processing tools T 2 The position coordinates of the tool tip Y 2-axis direction components; Indicates the second set of workpiece coordinate system WCS 2 lower processing tools T 2 The position coordinates of the tool tip Z 2-axis direction components; Indicates the second set of workpiece coordinate system WCS 2. Tool processing T 2. Tool posture X 2-axis direction components; Indicates the second set of workpiece coordinate system WCS 2 lower processing tools T 2. Tool posture Y 2-axis direction components; Indicates the second set of workpiece coordinate system WCS 2 lower processing tools T 2. Tool posture Z 2-axis direction components; B Indicates machining tool T 1 The position of the tool tip point around Y 1 axis rotates to this point to process the tool T 2. The angle of rotation when the tip of the knife is at the position point; Step 2: Get the first set of workpiece coordinate systems under the first set of five-axis motion components at the initial moment WCS 1's variable value under the coordinate transformation; let k =0, k =0, indicating the initial moment; Step 3: Based on the first transformation model and the k The first set of machine tool coordinate systems under the first set of five-axis motion components at the moment MCS 1 to obtain the value of each variable under k The first set of workpiece coordinate system under the first set of five-axis motion components at the moment WCS 1 and the second set of workpiece coordinate system under the second set of five-axis motion components WCS 2. The variable value under the coordinate transformation; Based on the first iterative inverse transform model and the k The first set of workpiece coordinate system under the first set of five-axis motion components at the moment WCS 1 The variable value under the coordinate transformation of k The variable values ​​of the first set of five-axis motion components in the machine tool coordinate system at time +1; Based on the second iterative inverse transform model and the k The workpiece coordinate system under the second set of five-axis motion components at the moment WCS 2. Obtain the variable value under the coordinate transformation of k The variable values ​​of the second set of five-axis motion components in the machine tool coordinate system at time +1; Step 4: The tool under the first set of five-axis motion components of the dual-spindle dual-five-axis linkage high-speed and high-efficiency vertical machining machine is adjusted according to the first k Workpiece coordinate system at the moment WCS 1 under the coordinate transformation of the variable value and the tool under the second set of five-axis motion components according to k Workpiece coordinate system at the moment WCS 2. The variable value under the coordinate transformation of the workpiece to be processed; Step 5: Judgement k Is it greater than or equal to K , K Indicates the maximum processing time of the machining tool when machining the workpiece to be processed. If k Greater than or equal to K , get the processed workpiece, if k Less than K ,make k = k +1, return to step 3.

2. The workpiece processing method according to claim 1, characterized in that: The two machine tool spindles are respectively arranged on two sets of five-axis motion components.

3. The workpiece processing method according to claim 1, characterized in that: The two sets of five-axis motion components are both arranged on the top surface of the track mounting frame.

4. The workpiece processing method according to any one of claims 1 to 3, characterized in that: The base includes a heat dissipation system, a chip removal system and / or a shock absorbing support device.

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