Pre-tensioning installation structure of screw rod for turning and milling compound machine tool

Abstract

The utility model relates to a kind of screw pre-tensioning installation structure for turning-milling combined machine tool, including screw body;Motor base, the screw body right end is inserted into motor base, right bearing set and first shaft sleeve are installed on the first bearing mounting section, first locking nut is connected on the first thread section, right gland is set in the motor base;End seat, second locking nut is set on the second thread section, left bearing set, second shaft sleeve and third shaft sleeve are set on the second bearing mounting section, third locking nut is set on the third thread section, left gland is set on the end seat.The screw pre-tensioning installation structure for turning-milling combined machine tool of the utility model, left end is adjusted by double locking nut to pre-tensioning to screw, greatly simplify assembly difficulty, pre-tensioning amount is used to offset thermal expansion amount, improve machine tool precision and life.

Description

Technical Field

[0001] This utility model relates to the field of machine tools, specifically to a lead screw pre-tensioning installation structure for a turning and milling composite machine tool. Background Technology

[0002] The dimensional differences between cold and hot machining processes on machine tools are significant, and one of the biggest influencing factors is the thermal expansion of the leadscrew. Due to frictional heat, thermal expansion occurs; for every 1 degree Celsius increase in leadscrew temperature, it elongates by approximately 1.1 micrometers per meter. To achieve higher and more stable machine tool precision, the leadscrew needs to be pre-stretched during assembly. During operation, the thermal expansion partially offsets this pre-stretching, reducing the tensile stress on the leadscrew while maintaining its length. This minimizes errors caused by thermal expansion.

[0003] The existing solution relies on assembly technicians to perform precise assembly control during assembly, but this is too demanding on the assemblers' work experience and cannot be accurately quantified. The existing installation structure does not have a pre-tensioning structure. Although a certain pre-tightening force can be applied during assembly by adding a nut, the nut will loosen after the machine tool has been running for a long time, making it difficult to ensure the stability and consistency of the machine tool's accuracy. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a lead screw pre-tensioning installation structure for turning and milling composite machine tools, thereby solving the technical problems of high assembly difficulty, poor long-term operation and inconvenient maintenance of the current lead screw pre-tensioning structure.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A pre-tension mounting structure for a lead screw in a milling and turning machine tool is provided, including:

[0007] The lead screw body has a first bearing mounting section, a first threaded section and a connecting section arranged sequentially on its right end, and a second threaded section, a second bearing mounting section and a third threaded section arranged sequentially on its left end.

[0008] A motor mount is installed on the lathe body. The right end of the lead screw body is inserted into the motor mount. A right bearing assembly and a first bushing are installed on the first bearing mounting section. A first locking nut is connected to the first threaded section. The first locking nut abuts against the inner ring of the right bearing assembly via the first bushing, thereby axially locking the right bearing assembly onto the lead screw body. A right pressure cover is provided inside the motor mount. The right pressure cover abuts against the outer ring of the right bearing assembly, thereby locking the right bearing assembly into the motor mount. The connecting section is connected to the drive motor via a coupling.

[0009] An end seat is mounted on the lathe body. The left end of the lead screw body is inserted into the end seat. A second locking nut is provided on the second threaded section, and the second locking nut is located outside the end seat. A left bearing assembly, a second bushing, and a third bushing are provided on the second bearing mounting section. The second bushing and the third bushing are respectively located on both sides of the left bearing assembly and abut against the inner ring of the bearing of the left bearing assembly. The second bushing abuts against the second locking nut. A third locking nut is provided on the third threaded section, and the third bushing is located between the third locking nut and the left bearing assembly. A left pressure cap is provided on the end seat, and the left pressure cap abuts against the outer ring of the bearing of the left bearing assembly.

[0010] Furthermore, an operating hole is provided at the upper end of the motor base, the right pressure cover and the coupling are located inside the operating hole, and a cover plate is provided at the upper end of the operating hole.

[0011] Furthermore, anti-collision pads are respectively provided on the motor base and the end seat.

[0012] Furthermore, a first sealing ring is provided between the first bushing and the right pressure cover, and between the motor base and the lead screw body.

[0013] Furthermore, a second sealing ring is provided between the second bushing and the end seat, and between the third bushing and the left pressure cover.

[0014] Furthermore, both the right bearing assembly and the left bearing assembly employ angular contact ball bearings.

[0015] The beneficial effects of this utility model are:

[0016] The present invention relates to a lead screw pre-tensioning mounting structure for milling and turning composite machine tools. The lead screw is pre-tensioned by adjusting the double locking nuts on the left end, which greatly simplifies the assembly process. The pre-tensioning amount is used to offset the thermal expansion, thereby improving the accuracy and lifespan of the machine tool. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 and Figure 2 This is a 3D view of the pre-tensioning installation structure of the lead screw for a milling and turning machine tool.

[0019] Figure 3 This is a schematic diagram of the motor mount;

[0020] Figure 4 This is a half-sectional view of the end seat;

[0021] Figure 5 This is a half-sectional view of the motor mount;

[0022] Among them, 1. lead screw body, 11. lead screw sleeve;

[0023] 2. Motor mount; 21. Drive motor; 22. Cover plate;

[0024] 31. Right bearing assembly; 32. First bushing; 33. First lock nut; 34. Right gland; 35. Coupling.

[0025] 4. End seat;

[0026] 51. Second locking nut; 52. Left bearing assembly; 53. Second bushing; 54. Third bushing; 55. Third locking nut; 56. Left pressure cap;

[0027] 6. Anti-collision pad; 71. First sealing ring; 72. Second sealing ring. Detailed Implementation

[0028] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0029] This application provides a lead screw pre-tensioning mounting structure for a milling and turning machine tool, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0030] To address the technical problems of difficult assembly, unfavorable long-term operation, and inconvenient maintenance in existing lead screw pretensioning structures, an embodiment of this application provides a lead screw pretensioning mounting structure for a milling and turning machine tool. This is described in detail below.

[0031] like Figures 1 to 5 As shown, a lead screw pre-tensioning mounting structure for a milling and turning machine tool includes...

[0032] The lead screw body 1 has a first bearing mounting section, a first threaded section and a connecting section arranged sequentially on its right end, and a second threaded section, a second bearing mounting section and a third threaded section arranged sequentially on its left end.

[0033] The motor base 2 is mounted on the lathe body. The right end of the lead screw body 1 is inserted into the motor base 2. The right bearing assembly 31 and the first bushing 32 are mounted on the first bearing mounting section. The first locking nut 33 is connected to the first threaded section. The first locking nut 33 abuts against the inner ring of the bearing of the right bearing assembly 31 through the first bushing 32, thereby axially locking the right bearing assembly 31 onto the lead screw body 1. The motor base 2 is provided with a right pressure cover 34. The right pressure cover 34 abuts against the outer ring of the bearing of the right bearing assembly 31, thereby locking the right bearing assembly 31 into the motor base 2. The connecting section is connected to the drive motor 21 via a coupling 35.

[0034] An end seat 4 is mounted on the lathe body. The left end of the lead screw body 1 is inserted into the end seat 4. A second locking nut 51 is provided on the second threaded section. The second locking nut 51 is located outside the end seat 4. A left bearing assembly 52, a second bushing 53, and a third bushing 54 are provided on the second bearing mounting section. The second bushing 53 and the third bushing 54 are located on both sides of the left bearing assembly 52 and abut against the inner ring of the bearing of the left bearing assembly 52. ​​The second bushing 53 abuts against the second locking nut 51. A third locking nut 55 is provided on the third threaded section. The third bushing 54 is located between the third locking nut 55 and the left bearing assembly 52. ​​A left pressure cover 56 is provided on the end seat 4. The left pressure cover 56 abuts against the outer ring of the bearing of the left bearing assembly 52.

[0035] A lead screw sleeve 11 is installed on the lead screw body 1. The lead screw sleeve 11 is connected to the tool post seat on the lathe. The lead screw body 1 rotates to drive the lead screw sleeve 11 and the tool post seat to move synchronously.

[0036] Specifically, as an optional implementation method in this embodiment, such as Figure 3 As shown, an operating hole is provided at the upper end of the motor base 2, the right pressure cover 34 and the coupling 35 are located in the operating hole, and a cover plate 22 is provided at the upper end of the operating hole.

[0037] The cover plate 22 is installed on the motor base 2 with screws. When it is necessary to adjust the right pressure cover 34 and coupling 35 inside the motor base 2, the cover plate 22 can be opened.

[0038] Specifically, as an optional implementation method in this embodiment, such as Figures 1 to 5 As shown, anti-collision pads 6 are respectively provided on the motor base 2 and the end base 4.

[0039] The anti-collision pad 6 is made of rubber, and its main purpose is to prevent the lead screw sleeve 11 from directly impacting the motor seat 2 or the end seat 4.

[0040] The anti-collision pad 6 is fixed to the motor base 2 and the end seat 4 with screws.

[0041] The second locking nut 51 on the end seat 4 is located inside the anti-collision pad 6.

[0042] Specifically, as an optional implementation method in this embodiment, such as Figure 5 As shown, a first sealing ring 71 is provided between the first bushing 32 and the right pressure cover 34, and between the motor base 2 and the lead screw body 1.

[0043] The first sealing ring 71 is used for waterproofing and to prevent cutting fluid from entering the right bearing assembly 31 during lathe operation.

[0044] Specifically, as an optional implementation method in this embodiment, such as Figure 4 As shown, a second sealing ring 72 is provided between the second bushing 53 and the end seat 4, and between the third bushing 54 and the left pressure cover 56.

[0045] The second sealing ring 72 is used to prevent cutting fluid from entering the left bearing assembly 52.

[0046] Specifically, as an optional implementation method in this embodiment, such as Figure 1 and Figure 2 As shown, both the right bearing assembly 31 and the left bearing assembly 52 employ angular contact ball bearings. The specific model of the angular contact ball bearing is 50TAC100C.

[0047] The installation process of the lead screw pre-tensioning mounting structure for milling and turning composite machine tools of this utility model is as follows:

[0048] After the right end of the lead screw body 1 is inserted into the motor base 2, the right bearing assembly 31 and the first bushing 32 are installed on the lead screw body 1. Then, the right bearing assembly 31 and the first bushing 32 are axially locked onto the lead screw body 1 by the first locking nut 33. The right pressure cover 34 is fixed in the motor base 2 by screws, thereby locking the right bearing assembly 31 in the bearing mounting cavity in the motor base 2. The drive motor 21 is installed on the motor base 2, and the drive motor 21 and the right end of the lead screw body 1 are connected by the coupling 35. The two ends of the coupling 35 are connected to the motor shaft and the lead screw body 1 by connecting pins, respectively.

[0049] The left end of the lead screw body 1 is inserted into the end seat 4. The second locking nut 51 is connected to the lead screw body 1. The second locking nut 51 has an axial adjustment distance on the second thread section. The second bushing 53, the left bearing assembly 52 and the third bushing 54 are installed in the end seat 4. Finally, the third locking nut 55 is screwed on, and the left pressure cover 56 is fixed to the end seat 4 by screws.

[0050] Both the motor base 2 and the end seat 4 are mounted on the lathe body. When the lead screw body 1 needs to be pre-stretched, the second locking nut 51 moves to the right first, so that the lead screw body 1 has space to move to the left. Then the third locking nut 55 is tightened, thereby pulling the lead screw body 1 between the end seat 4 and the motor base 2. Finally, the second locking nut 51 is moved to the left, and the second locking nut 51 is placed against the right side of the end seat 4, so that the lead screw body 1 is locked at both ends of the end seat 4.

[0051] The present invention relates to a lead screw pre-tensioning mounting structure for milling and turning composite machine tools. The lead screw is pre-tensioned by adjusting the double locking nuts on the left end, which greatly simplifies the assembly process. The pre-tensioning amount is used to offset the thermal expansion, thereby improving the accuracy and lifespan of the machine tool.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pre-tensioning mounting structure for a lead screw in a milling and turning machine tool, characterized in that, include The lead screw body has a first bearing mounting section, a first threaded section and a connecting section arranged sequentially on its right end, and a second threaded section, a second bearing mounting section and a third threaded section arranged sequentially on its left end. A motor mount is installed on the lathe body. The right end of the lead screw body is inserted into the motor mount. A right bearing assembly and a first bushing are installed on the first bearing mounting section. A first locking nut is connected to the first threaded section. The first locking nut abuts against the inner ring of the right bearing assembly via the first bushing, thereby axially locking the right bearing assembly onto the lead screw body. A right pressure cover is provided inside the motor mount. The right pressure cover abuts against the outer ring of the right bearing assembly, thereby locking the right bearing assembly into the motor mount. The connecting section is connected to the drive motor via a coupling. An end seat is mounted on the lathe body. The left end of the lead screw body is inserted into the end seat. A second locking nut is provided on the second threaded section, and the second locking nut is located outside the end seat. A left bearing assembly, a second bushing, and a third bushing are provided on the second bearing mounting section. The second bushing and the third bushing are respectively located on both sides of the left bearing assembly and abut against the inner ring of the bearing of the left bearing assembly. The second bushing abuts against the second locking nut. A third locking nut is provided on the third threaded section, and the third bushing is located between the third locking nut and the left bearing assembly. A left pressure cap is provided on the end seat, and the left pressure cap abuts against the outer ring of the bearing of the left bearing assembly.

2. The lead screw pre-tensioning mounting structure for milling and turning composite machine tools according to claim 1, characterized in that, An operating hole is provided at the upper end of the motor base, the right pressure cover and the coupling are located inside the operating hole, and a cover plate is provided at the upper end of the operating hole.

3. The lead screw pre-tensioning mounting structure for milling and turning composite machine tools according to claim 1, characterized in that, Anti-collision pads are respectively provided on the motor base and the end seat.

4. The lead screw pre-tensioning mounting structure for milling and turning composite machine tools according to claim 1, characterized in that, A first sealing ring is provided between the first bushing and the right pressure cover, and between the motor base and the lead screw body.

5. The lead screw pre-tensioning mounting structure for milling and turning composite machine tools according to claim 1, characterized in that, A second sealing ring is provided between the second bushing and the end seat, and between the third bushing and the left pressure cover.

6. The lead screw pre-tensioning mounting structure for milling and turning composite machine tools according to claim 1, characterized in that, Both the right and left bearing assemblies use angular contact ball bearings.

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