Connecting structure and method of cavity type machine tool frame and linear motor coil

Abstract

The application discloses a connecting structure and method of a cavity machine tool frame and a linear motor coil, and the method comprises the following steps: manufacturing a threaded sleeve and a cavity machine tool frame mounting hole, reserving a machining allowance of 0.5-1mm on the connecting surface of the threaded sleeve and the cavity machine tool frame and the linear motor coil; coating the outer surface of the threaded sleeve with a threaded glue; screwing the threaded sleeve into the mounting hole of the cavity machine tool frame by using a wrench; after the threaded glue is solidified, grinding the reserved machining allowance surface on the threaded sleeve and the cavity machine tool frame together; screwing a screw through the cavity machine tool frame mounting hole and into the linear motor coil through the threaded sleeve, so as to realize high-precision and high-efficiency connection of the cavity machine tool frame and the linear motor coil; the application avoids using an elongated counter-boring tool, reduces tool loss and saves the time for counter-boring; the connecting mode is improved by designing the threaded sleeve, the depth of the screw screwed into the linear motor coil is consistent, and the machining precision is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machining of cavity parts, and more particularly relates to a connecting structure and method of a cavity machine tool frame and a linear motor coil. BACKGROUND

[0002] In engineering applications, multiple screws are usually used to connect the frame and the linear motor coil together. The threads are on the motor coil mounting surface, and the screw through holes (generally with counterbores) are on the frame. The linear motor coil mounting threads for direct drive machine tools are usually M6 or M8, and the corresponding frame screw through holes are φ6.6 (counterbore φ11) or φ9 (counterbore φ15). In addition, due to structural limitations, the installation thread holes of the linear motor coil are usually shallow in depth, so it is necessary to control the depth of the screw screwing into the linear motor coil by controlling the depth of the counterbore of the frame screw.

[0003] As shown in Figure 1 , it is a schematic diagram of the connecting structure of the existing cavity machine tool frame and the linear motor coil. Due to the structural limitations of the cavity machine tool frame, it is usually not possible to machine the above-mentioned screw through holes and counterbores in one step, and they need to be machined in steps. The screw through holes can only be machined first, and then the counterbores can be machined using a counterbore tool. The installation screw holes of the linear motor coil for direct drive machine tools are as many as 20-30. Each counterbore machining requires a counterbore tool to be installed, disassembled, and adjusted once, and each counterbore needs to be installed, disassembled, and adjusted separately, resulting in extremely low machining efficiency. Due to the small diameter of the screw through holes and counterbores and the large thickness of the frame, the counterbore tool bar is too thin and too long, not only causing rapid tool wear, but also being easily broken. In addition, the slender design of the counterbore tool leads to large size deviation of the counterbore depth, making it difficult to ensure machining accuracy. Due to low machining efficiency and high tool wear rate, the processing cost is increased. Manual operation of the counterbore tool for counterbore machining is labor-intensive and prone to machining errors due to improper operation.

[0004] Therefore, it is urgent to develop a convenient and efficient connecting structure and method of a cavity machine tool frame and a linear motor coil. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a connecting structure and method of a cavity type machine tool frame and a linear motor coil, which comprises a frame through hole provided on the cavity type machine tool frame, a threaded sleeve installed on the frame through hole, a screw through hole provided on the threaded sleeve, and a machining allowance of 0.5-1 mm reserved on the connecting surfaces of the threaded sleeve, the cavity type machine tool frame and the linear motor coil, and the machining allowance is milled or ground after the threaded glue is solidified to accurately control the flatness of the linear motor installation surface; the screw is screwed into the linear motor coil through the frame through hole and the screw through hole to realize high-efficiency and high-precision connection of the cavity type machine tool frame and the linear motor coil; the connecting method of the present application is suitable for linear motor coils and cavity type machine tool frames of various specifications and has good universality and adaptability; due to the simplification of the connecting structure, the later maintenance and replacement work also becomes easier and faster; the present application can solve the engineering problems of difficult machining of the small-diameter counterbore for the installation of the linear motor coil and the linear motor coil installation screw and can realize the improvement of the machining efficiency, the guarantee of the installation precision and the simplicity of the maintenance, which is of great significance to improve the production efficiency and reliability of the machine tool.

[0006] In order to achieve the above-mentioned purpose, the present application provides a connecting structure of a cavity type machine tool frame and a linear motor coil, which comprises a frame through hole provided through the cavity type machine tool frame, a counterbore provided concentrically on the end face of the cavity type machine tool frame and the frame through hole, a threaded sleeve provided in the frame through hole and the counterbore, and a screw for fixing the frame and the linear motor coil in sequence through the frame through hole, the threaded sleeve and the linear motor coil; an external thread is provided on the outer surface of the threaded sleeve; the center of the threaded sleeve is provided with a screw through hole matched with the screw;

[0007] A machining allowance of 0.5-1 mm is reserved on the connecting surfaces of the threaded sleeve, the cavity type machine tool frame and the linear motor coil;

[0008] The threaded sleeve coated with threaded glue is screwed into the frame through hole of the cavity type machine tool frame by using a wrench, the threaded sleeve and the machining allowance surface reserved on the cavity type machine tool frame are milled or ground after the threaded glue is solidified, and then the installation surface of the frame and the linear motor coil is ensured to be a plane; then the screw is screwed into the linear motor coil through the frame through hole and the threaded sleeve to realize high-precision and high-efficiency connection of the cavity type machine tool frame and the linear motor coil.

[0009] Further, the diameter of the counterbore is greater than the diameter of the frame through hole and is matched with the maximum outer diameter of the threaded sleeve; the diameter of the frame through hole is matched with the maximum outer diameter of the end of the threaded sleeve away from the linear motor coil.

[0010] Further, an internal hexagonal hole is provided at the end of the threaded sleeve close to the linear motor coil.

[0011] The hole diameter of the screw through hole is smaller than the diameter of the inscribed circle of the hexagonal socket;

[0012] The outer surface of the threaded sleeve is provided with an inwardly recessed groove, forming an annular step, and the step surface is a limiting surface.

[0013] Further, the threaded sleeve comprises a first cylinder, a second cylinder and a third cylinder which are concentrically arranged.

[0014] Further, the hole diameter of the counterbore is matched with the outer diameter of the first cylinder;

[0015] The hole diameter of the rack through hole is matched with the outer diameter of the third cylinder.

[0016] Further, the outer diameter of the first cylinder is larger than the outer diameter of the third cylinder, and the outer diameter of the third cylinder is larger than the outer diameter of the second cylinder, so that steps are formed between the first cylinder and the second cylinder and between the second cylinder and the third cylinder, respectively;

[0017] The outer surface of the second cylinder is a step limiting surface.

[0018] Further, the outer surface of the third cylinder is provided with external threads;

[0019] The hexagonal socket is arranged at the center of the first cylinder and the second cylinder;

[0020] The screw through hole is arranged at the center of the third cylinder.

[0021] Further, the end face of the first cylinder away from the second cylinder is reserved with a machining allowance of 0.5-1mm.

[0022] The second aspect of the present application provides a connection method of a cavity type machine tool rack and a linear motor coil, which is realized by using the connection structure of the cavity type machine tool rack and the linear motor coil, and comprises the following steps:

[0023] S1: manufacturing a threaded sleeve and manufacturing the mounting hole of the threaded sleeve on the cavity type machine tool rack, and reserving a machining allowance of 0.5-1mm on the connection surface of the threaded sleeve and the cavity type machine tool rack and the linear motor coil;

[0024] S2: coating the outer surface of the threaded sleeve with thread glue; screwing the threaded sleeve into the mounting hole of the cavity type machine tool rack by using a wrench, so that the threaded sleeve reaches the specified tightening torque;

[0025] S3: after the thread glue is cured, milling or grinding the reserved machining allowance surface of the threaded sleeve and the cavity type machine tool rack together, so as to ensure that the mounting surface of the rack and the linear motor coil is a plane;

[0026] S4: the screw is screwed through the installation hole on the cavity type machine tool frame and into the linear motor coil through the threaded sleeve, thereby realizing high-precision and high-efficiency connection of the cavity type machine tool frame and the linear motor coil.

[0027] Further, the manufacturing of the threaded sleeve in step S1 comprises:

[0028] S11: determining the depth a of the screw needed to be screwed into the linear motor coil;

[0029] S12: determining the thickness d of the cavity type machine tool frame;

[0030] S13: according to the depth a of the screw needed to be screwed into the linear motor coil and the thickness d of the cavity type machine tool frame, determining the overall height c of the threaded sleeve and the height b of the first cylinder;

[0031] S14: according to the overall height c of the threaded sleeve and the height b of the first cylinder, machining the threaded plug, and reserving a machining allowance of 0.5-1mm on the connecting surface A of the threaded plug and the linear motor coil;

[0032] S15: machining an internal hexagonal hole and a screw via hole inside the threaded plug, and machining external threads outside the threaded plug.

[0033] Further, the manufacturing of the installation hole of the threaded sleeve on the cavity type machine tool frame in step S1 comprises:

[0034] According to the threaded bottom hole of the third cylinder on the threaded sleeve, a frame via hole penetrating through the cavity type machine tool frame is arranged;

[0035] According to the outer diameter of the first cylinder on the threaded sleeve, a counterbore concentric with the frame via hole is arranged on the end surface of the cavity type machine tool frame; the hole depth of the counterbore is greater than the height of the first cylinder, and the difference between them is 0.5-1mm.

[0036] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0037] The cavity type machine tool frame and linear motor coil connection structure and method of the present application avoids the counter-boring processing of the small diameter counter-bore in the traditional method by drilling the threaded sleeve threaded hole and the wrench hole on the front surface, reduces the frequent installation, disassembly and tool setting of the counter-boring tool, and significantly improves the processing efficiency; since the use of the slender counter-boring tool for small diameter counter-bore processing is avoided, the possibility of tool breakage is reduced, thereby reducing the potential risk in production; the depth of the screw screwed into the linear motor coil can be accurately controlled through the design of the threaded sleeve, ensuring the installation accuracy of the linear motor coil and being beneficial to improving the overall performance of the machine tool; the stepped design and internal hexagonal hole of the threaded sleeve provide a convenient installation method, so that the screw can be directly connected with the linear motor coil through the threaded sleeve, simplifying the installation process; the connection of the threaded sleeve and the cavity type machine tool frame in combination with the use of the thread glue enhances the stability and reliability of the connection, which is beneficial to ensuring the stability of the machine tool during operation; by reserving the machining allowance on the threaded sleeve and the frame, and milling or grinding after the thread glue is cured, the flatness of the linear motor installation surface can be accurately controlled, further improving the processing quality of the product; the connection method is suitable for linear motor coils and cavity type machine tool frames of various specifications, and has good universality and adaptability; due to the simplification of the connection structure, the later maintenance and replacement work also becomes easier and faster; the present application can solve the engineering problems of difficult small diameter counter-bore processing for the installation of the linear motor coil and the cavity type machine tool frame, and difficult control of the screw depth for the installation of the linear motor coil; the processing efficiency can be improved, the installation accuracy can be ensured, and the maintenance is simple, which is of great significance to improving the production efficiency and reliability of the machine tool. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the connection of the existing cavity type machine tool frame and linear motor coil;

[0039] Figure 2 It is an installation structural schematic diagram of a connection structure of a cavity type machine tool frame and linear motor coil according to an embodiment of the present application;

[0040] Figure 3 It is a local enlarged schematic diagram of an installation scene of a connection structure of a cavity type machine tool frame and linear motor coil according to an embodiment of the present application;

[0041] Figure 4 It is a structural schematic diagram of an installation hole on a cavity type machine tool frame in a connection method of a cavity type machine tool frame and linear motor coil according to an embodiment of the present application;

[0042] Figure 5 It is a sectional view structural schematic diagram of a threaded sleeve of a connection structure of a cavity type machine tool frame and linear motor coil according to an embodiment of the present application;

[0043] Figure 6 It is an internal structure schematic view of a threaded sleeve of a cavity type machine tool frame and linear motor coil connection structure of an embodiment of the present application;

[0044] Figure 7 It is a flowchart schematic view of a cavity type machine tool frame and linear motor coil connection method of an embodiment of the present application.

[0045] In all the drawings, the same reference signs represent the same technical features, specifically: 100-cavity type machine tool frame, 1-frame through hole, 2-counterbore, 3-threaded sleeve, 31-first cylinder, 32-second cylinder, 33-third cylinder, 34-internal hexagonal hole, 4-linear motor coil, 5-screw, 51-screw through hole, 6-coil precision cooler. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer and more comprehensible, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, when an element is referred to as being "fixed to", "disposed on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element; the terms "mounting", "connection", "connecting", "provided with" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In addition, the terms "first", "second" and the like are only used for description purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0049] As Figures 2-6As shown, one aspect of the present application provides a connection structure of a cavity type machine tool frame and a linear motor coil, comprising a frame through hole 1 arranged through the cavity type machine tool frame 100, a counterbore 2 arranged concentrically on the end face of the cavity type machine tool frame 100 and the frame through hole 1, a threaded sleeve 3 arranged in the frame through hole 1 and the counterbore 2, and a screw 5 sequentially penetrating the frame through hole 1, the threaded sleeve 3 and the linear motor coil 4 to fix the frame and the linear motor coil 4; the outer surface of the threaded sleeve 3 is provided with external threads; the center of the threaded sleeve 3 is provided with a screw through hole 51 matched with the screw 5; one end of the threaded sleeve 3 close to the linear motor coil 4 is provided with an internal hexagonal hole 34; the hole diameter of the screw through hole 51 is smaller than the diameter of the inscribed circle of the internal hexagonal hole 34; the outer surface of the threaded sleeve 3 is provided with an inwardly recessed groove, forming an annular step, and the step surface is a limiting surface; the surfaces of the threaded sleeve 3 and the cavity type machine tool frame 100 and the linear motor coil 4 are respectively left with a machining allowance of 0.5-1mm; the frame through hole 1 is used for subsequent installation and positioning of the threaded sleeve 3; during assembly, the outer surface of the threaded sleeve 3 is coated with thread glue, the threaded sleeve 3 is screwed into the frame through hole 1 of the cavity type machine tool frame 100 through a wrench, after the thread glue solidifies, the threaded sleeve 3 and the machining allowance surface reserved on the cavity type machine tool frame 100 are milled or ground together, thereby ensuring that the installation surface A of the frame and the linear motor coil is a plane; then the screw 5 is penetrated through the frame through hole 1 and screwed into the linear motor coil 4 through the threaded sleeve 3, realizing high-precision and high-efficiency connection of the cavity type machine tool frame 100 and the linear motor coil 4; the connection method of the present application is suitable for linear motor coils and cavity type machine tool frames of various specifications, and has good universality and adaptability; due to the simplification of the connection structure, the later maintenance and replacement work also becomes easier and faster; the present application can solve the engineering problems of difficult machining of small diameter counterbores for installation of linear motor coils and cavity type machine tool frames, and difficult control of screw penetration depth for installation of linear motor coils; can realize improvement of machining efficiency, guarantee of installation precision and simplicity of maintenance, and has important significance for improving the production efficiency and reliability of the machine tool.

[0050] Further, as Figures 2-6As shown, the hole diameter of the counterbore 2 is larger than the hole diameter of the frame through hole 1 and is matched with the maximum outer diameter of the threaded sleeve 3; the hole diameter of the frame through hole 1 is matched with the maximum outer diameter of the threaded sleeve 3 away from the linear motor coil 4; the linear motor coil 4 and the cavity type machine tool frame 100 are selectively provided with a coil precision cooler 6; the threaded sleeve 3 comprises integrally formed concentrically arranged first, second and third cylinders 31, 32 and 33; the hole diameter of the counterbore 2 is matched with the outer diameter of the first cylinder 31; the hole diameter of the frame through hole 1 is matched with the outer diameter of the third cylinder 33; the outer diameter of the first cylinder 31 is larger than that of the third cylinder 33, and the outer diameter of the third cylinder 33 is larger than that of the second cylinder 32, so that steps are formed between the first and second cylinders 31 and 32 and between the second and third cylinders 32 and 33, respectively; the outer surface of the second cylinder 32 is a step limiting surface; the outer surface of the third cylinder 33 is provided with external threads; the inner hexagonal hole 34 is arranged at the center of the first cylinder 31 and the second cylinder 32 and is used for screwing the threaded sleeve 3 into the cavity type machine tool frame 1 by a wrench; the screw through hole 51 is arranged at the center of the third cylinder 33; the end face of the first cylinder 31 away from the second cylinder 32 is reserved with a machining allowance of 0.5-1 mm; during assembly, thread glue is applied to the outer surface of the third cylinder 33, the threaded sleeve 3 is installed in the frame through hole 1 on the side close to the linear motor coil 4 of the cavity type machine tool frame 100 by the wrench and the inner hexagonal hole 34, and the screw 5 passes through the screw through hole of the frame through hole 1, the first cylinder 31, the second cylinder 32 and the third cylinder 33 and is sequentially coupled with the linear motor coil 4; the threaded sleeve and the cavity type machine tool frame are both reserved with machining allowances, and the machining allowances of the threaded sleeve and the cavity type machine tool frame are milled or ground together after the threaded sleeve and the cavity type machine tool frame are coupled and the thread glue is cured, so that the linear motor mounting surface is ensured to be a plane.

[0051] Further, in a specific embodiment of the present application, the combination of the linear motor coil 4, the coil precision cooler 6 (optional), the cavity type machine tool frame 100 and the threaded sleeve 3 is sequentially connected by the screw 5; the screw 5 is tightened by the wrench through the rear extension hole of the cavity type machine tool frame 100; and the screwing depth a of the screw in the linear motor coil 4 is controlled by the height dimension c of the threaded sleeve 3.

[0052] Further, in a specific embodiment of the present application, the manufacturing method of the threaded sleeve 3 is as follows: Figure 5 and Figure 6The required number of threaded plugs is processed, the internal hexagonal hole (S=10) and M8 screw through hole (diameter φ9) are processed in the threaded sleeve 3, the threaded sleeve thread is M20*1.5, the maximum outer diameter φ25 of the threaded sleeve is ensured, the b and c dimensions of the threaded sleeve 3 are determined according to the cavity type machine tool rack thickness d and the screwing depth a of the linear motor, and the b dimension of the threaded sleeve 3 is reserved with a machining allowance of 0.5-1 mm on the A surface.

[0053] Further, in one specific embodiment of the present application, the manufacturing method of the mounting hole on the cavity type machine tool rack 100 is as follows: Figure 4 The counterbore 2 and the rack through hole 1 are processed, the rack through hole 1 is a threaded hole with M20*1.5, the extension hole diameter of the rack through hole 1 is the bottom hole diameter of the M20*1.5 threaded hole, and the b dimension of the cavity type machine tool rack is reserved with a machining allowance of 0.5-1 mm on the A surface.

[0054] Further, in one specific embodiment of the present application, the manufacturing method of the cavity type machine tool rack 100 and the threaded sleeve 3 assembly is as follows: the threaded sleeve 3 is coated with thread glue at the external thread, all threaded sleeves 3 are screwed into the threaded counterbore of the cavity type machine tool rack 100 by using an internal hexagonal wrench through the internal hexagonal hole 34 on the threaded sleeve 3, when the threaded sleeve 3 reaches the specified tightening torque, the A surface of the cavity type machine tool rack 100 and the threaded sleeve 3 assembly is milled or ground after the thread glue solidifies to ensure that the depth of the counterbore 2 on the cavity type machine tool rack 100 and the height of the first cylinder 31 on the threaded sleeve 3 are both b dimensions, thereby ensuring that the mounting surface (A surface) of the cavity type machine tool rack 100 and the linear motor coil 4 is a plane.

[0055] As shown in Figure 7 Another aspect of the present application provides a connection method of a cavity type machine tool rack and a linear motor coil, comprising the following steps:

[0056] S1: manufacturing the threaded sleeve 3 and manufacturing the mounting hole of the threaded sleeve 3 on the cavity type machine tool rack 100, and reserving a machining allowance of 0.5-1 mm on the connection surface of the threaded sleeve 3 and the cavity type machine tool rack 100 and the linear motor coil 4 respectively;

[0057] S2: coating the external surface of the threaded sleeve 3 with thread glue; screwing the threaded sleeve 3 into the mounting hole of the cavity type machine tool rack 100 by using a wrench, so that the threaded sleeve 3 reaches the specified tightening torque;

[0058] S3: after the thread glue solidifies, milling or grinding the machining allowance surface reserved on the threaded sleeve and the cavity type machine tool rack together, so as to ensure that the mounting surface of the rack and the linear motor coil is a plane;

[0059] S4: Screw 5 is passed through the mounting hole on the cavity type machine tool frame 100, and is screwed into the linear motor coil 4 through the threaded sleeve 3, so as to realize high-precision and high-efficiency connection of the cavity type machine tool frame 100 and the linear motor coil 4.

[0060] Further, the manufacturing of the threaded sleeve 3 in step S1 comprises:

[0061] S11: Determine the depth a of the screw 5 needed to be screwed into the linear motor coil 4;

[0062] S12: Determine the thickness d of the cavity type machine tool frame;

[0063] S13: According to the depth a of the screw 5 needed to be screwed into the linear motor coil 4 and the thickness d of the cavity type machine tool frame, determine the overall height c of the threaded sleeve 3 and the height b of the first cylinder 31;

[0064] S14: According to the overall height c of the threaded sleeve 3 and the height b of the first cylinder 31, process the threaded plug, and reserve a machining allowance of 0.5-1mm on the connecting surface A of the threaded plug and the linear motor coil 4;

[0065] S15: Process the internal hexagonal hole 34 and the screw through hole 51 inside the threaded plug, and process the external thread outside;

[0066] Through the above steps, a threaded sleeve with reasonable structure, convenient installation and controllable precision can be manufactured, which is suitable for the connection of the cavity type machine tool frame and the linear motor coil, and effectively improves the reliability and installation efficiency of the connection;

[0067] Further, the manufacturing of the mounting hole of the threaded sleeve 3 on the cavity type machine tool frame 100 in step S1 comprises:

[0068] According to the threaded bottom hole of the third cylinder 33 on the threaded sleeve 3, a frame through hole 1 penetrating the cavity type machine tool frame 100 is arranged; the frame through hole 1 is used for subsequent installation and positioning of the threaded sleeve 3 and linear motor screw installation wrench through hole;

[0069] According to the outer diameter of the first cylinder 31 on the threaded sleeve 3, a counterbore 2 concentric with the frame through hole 1 is arranged on the end surface of the cavity type machine tool frame 100; the hole depth of the counterbore 2 is greater than the height b of the first cylinder 31, and the difference between them is 0.5-1mm, which is used as the subsequent cutting allowance.

[0070] The setting of the counterbore 2 is to ensure that the threaded sleeve 3 can be stably installed on the cavity type machine tool frame 100, and to provide sufficient installation space for the screw 4; the difference between the depth of the counterbore 2 and the height of the first cylinder 31 is controlled within the range of 0.5-1mm; this difference range ensures that the first cylinder 31 of the threaded sleeve 3 can be properly embedded in the counterbore 2 after installation, while ensuring the close fit between the threaded sleeve 3 and the cavity type machine tool frame 100; through the above steps, the installation hole of the cavity type machine tool frame 100 can be accurately manufactured, providing accurate positioning and appropriate fitting depth for the installation of the threaded sleeve 3, thereby ensuring the stability and reliability of the entire connection structure.

[0071] The cavity type machine tool frame and linear motor coil connection structure and method of the present application, by providing a frame via hole on the cavity type machine tool frame, installing a threaded sleeve on the frame via hole, providing a screw via hole on the threaded sleeve, reserving a machining allowance of 0.5-1mm on the connection surface of the threaded sleeve and the cavity type machine tool frame and the linear motor coil respectively, and milling or grinding after the curing of the threaded glue, accurately controlling the flatness of the linear motor installation surface; by screwing the screw through the frame via hole and the screw via hole into the linear motor coil, high-efficiency and high-precision connection of the cavity type machine tool frame and the linear motor coil is achieved; by simplifying the processing steps, reducing the dependence on counter-boring tools, and reducing the processing time of each counterbore; avoiding the use of long and thin counter-boring tools, reducing tool wear; by designing the threaded sleeve to improve the connection method, ensuring the consistent depth of the screw screwed into the linear motor coil, improving the processing precision; by improving the efficiency and reducing the tool wear, reducing the overall processing cost; by reducing the complexity of manual operation, reducing the labor intensity, and reducing the processing errors caused by improper operation.

[0072] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A connection structure between a cavity-type machine tool frame and a linear motor coil, characterized in that: The application relates to a cavity type machine tool frame (100) which comprises a frame through hole (1) arranged through the cavity type machine tool frame (100), a counterbore (2) arranged at the end face of the cavity type machine tool frame (100) and concentric with the frame through hole (1), a threaded sleeve (3) arranged in the frame through hole (1) and the counterbore (2), and a screw (5) for fixing the frame and a linear motor coil (4) by sequentially penetrating the frame through hole (1), the threaded sleeve (3) and the linear motor coil (4). An inner hexagonal hole (34) is arranged at one end of the threaded sleeve (3) close to the linear motor coil (4). The hole diameter of the screw through hole (51) is smaller than the diameter of the inscribed circle of the inner hexagonal hole (34). The outer surface of the threaded sleeve (3) is provided with an inwardly recessed groove, forming an annular step, and the step surface is a limiting surface. The threaded sleeve (3) comprises a first cylinder (31), a second cylinder (32) and a third cylinder (33) which are integrally formed and arranged concentrically. The hole diameter of the counterbore (2) is matched with the outer diameter of the first cylinder (31). The hole diameter of the frame through hole (1) is matched with the outer diameter of the third cylinder (33). The outer diameter of the first cylinder (31) is larger than that of the third cylinder (33), and the outer diameter of the third cylinder (33) is larger than that of the second cylinder (32), so that steps are formed between the first cylinder (31) and the second cylinder (32) and between the second cylinder (32) and the third cylinder (33) respectively. The outer surface of the second cylinder (32) is a step limiting surface. The connecting surfaces of the threaded sleeve (3), the cavity type machine tool frame (100) and the linear motor coil (4) are respectively reserved with a machining allowance of 0.5-1mm. The threaded sleeve (3) coated with thread glue is screwed into the frame through hole (1) of the cavity type machine tool frame (100) by using a wrench, the threaded sleeve (3) and the machining allowance surface reserved on the cavity type machine tool frame (100) are milled or ground after the thread glue is solidified, so that the mounting surface of the frame and the linear motor coil is ensured to be a plane; then the screw (5) is screwed into the linear motor coil (4) through the frame through hole (1) and the threaded sleeve (3), so that the cavity type machine tool frame (100) and the linear motor coil (4) are connected with high precision and high efficiency.

2. The connection structure of a linear motor coil and a cavity machine tool frame according to claim 1, characterized in that: The hole diameter of the counterbore (2) is larger than the hole diameter of the frame through hole (1) and is matched with the maximum outer diameter of the threaded sleeve (3); the hole diameter of the frame through hole (1) is matched with the maximum outer diameter of the threaded sleeve (3) away from the linear motor coil (4).

3. The connection structure of a linear motor coil and a cavity machine tool frame according to claim 2, characterized in that: The outer surface of the third cylinder (33) is provided with external threads. The inner hexagonal hole (34) is arranged at the center of the first cylinder (31) and the second cylinder (32). The screw through hole (51) is arranged at the center of the third cylinder (33).

4. The connection structure of a linear motor coil and a cavity machine tool frame according to any one of claims 1-3, characterized in that: The end face of the first cylinder (31) away from the second cylinder (32) is reserved with a machining allowance of 0.5-1mm.

5. A method of connecting a cavity-type machine tool frame to a linear motor coil, characterized by, The application relates to a connecting structure of a cavity type machine tool frame and a linear motor coil, and is realized by the steps of: S1: manufacturing a threaded sleeve (3) and manufacturing an installation hole of the threaded sleeve (3) on the cavity type machine tool frame (100), and reserving a machining allowance of 0.5-1 mm on the connecting surface of the threaded sleeve (3) and the cavity type machine tool frame (100) and the linear motor coil (4); S2: coating the outer surface of the threaded sleeve (3) with thread glue; screwing the threaded sleeve (3) into the installation hole of the cavity type machine tool frame (100) through a wrench, so that the threaded sleeve (3) reaches a specified tightening torque; S3: after the thread glue is solidified, the machining allowance surface reserved on the threaded sleeve and the cavity type machine tool frame is milled or ground together, so that the installation surface of the frame and the linear motor coil is a plane; S4: screwing a screw (5) through the installation hole on the cavity type machine tool frame (100) into the linear motor coil (4) through the threaded sleeve (3), so as to realize high-precision and high-efficiency connection of the cavity type machine tool frame (100) and the linear motor coil (4).

6. The method of claim 5, wherein: The manufacturing of the threaded sleeve (3) in step S1 comprises: S11: determining the depth of the screw (5) needed to be screwed into the linear motor coil (4); S12: determining the thickness of the cavity type machine tool frame; S13: determining the overall height of the threaded sleeve (3) and the height of the first cylinder (31) according to the depth of the screw (5) needed to be screwed into the linear motor coil (4) and the thickness of the cavity type machine tool frame; S14: processing a threaded plug according to the overall height of the threaded sleeve (3) and the height of the first cylinder (31), and reserving a machining allowance of 0.5-1 mm on the connecting surface A of the threaded plug and the linear motor coil (4); S15: processing an internal hexagonal hole (34) and a screw through hole (51) in the threaded plug, and processing external threads on the outside.

7. The method of claim 5, wherein the method further comprises: providing a plurality of linear motors; and connecting the plurality of linear motors to the plurality of linear motor slots. The manufacturing of the installation hole of the threaded sleeve (3) on the cavity type machine tool frame (100) in step S1 comprises: According to the threaded bottom hole of the third cylinder (33) on the threaded sleeve (3), a frame through hole (1) penetrating the cavity type machine tool frame (100) is arranged; According to the outer diameter of the first cylinder (31) on the threaded sleeve (3), a counterbore (2) concentric with the frame through hole (1) is arranged on the end surface of the cavity type machine tool frame (100); the hole depth of the counterbore (2) is greater than the height of the first cylinder (31), and the difference value is 0.5-1 mm.

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