Self-grinding driving method for high-precision heavy horizontal lathe core component tailstock mandrel

Abstract

The invention relates to a high-precision heavy horizontal lathe core part tailstock mandrel self-grinding driving method, a high-precision heavy horizontal lathe core part tailstock mandrel self-grinding driving device is adopted for operation, the device comprises a tailstock body, a sleeve mandrel assembly is arranged in the tailstock body, and a mandrel is arranged in the sleeve mandrel assembly; a first high-precision bearing, a second high-precision bearing and a third high-precision bearing are sequentially arranged at a step between the mandrel and the inner side of the sleeve mandrel assembly from left to right; and a driving device is arranged on the tailstock body. By the adoption of the method, tests verify that after autogenous grinding, the precision of the high-precision bearing of the tailstock is not larger than 0.002 mm, the installation precision of the tailstock center is not larger than 0.004 mm by adding field measurement errors, accumulated errors are reduced, the installation precision requirement of the machine tool center is met, and the precision of the tailstock center is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial machine tools, and in particular relates to a self-grinding driving method for a tailstock spindle, a core component of a high-precision heavy-duty horizontal lathe. Background Art

[0002] With the rapid development of the machine tool industry, the requirements for the machining accuracy, load-bearing capacity and reliability of machine tools are becoming higher and higher. The tailstock center of a high-precision heavy-duty CNC horizontal lathe is a key component specially designed for positioning and supporting workpieces in high-precision heavy-duty CNC horizontal lathes. It plays a role in positioning and bearing by cooperating with the center hole on the workpiece to ensure the high precision and stability of the workpiece during the machining process. As the positioning reference of the entire high-precision machine tool, ensuring the accuracy of the tailstock center is the key to ensuring the stability and accuracy of the entire machining process. Because the tailstock center is connected to the mandrel through the matching tapered hole on the mandrel and the screw hole on the end face, the accuracy of the tapered hole on the mandrel and the accuracy of the end face are the top priorities in the accuracy requirements of the tailstock center. The tailstock mandrel assembly is a driven mechanism without a power source. This type of tailstock mandrel assembly has a large structural size, a large number of parts that make up the assembly, and requires high machining accuracy. There are many machining links involved. The cumulative errors of the machining parts, assembly errors and other process errors make it difficult to achieve the required high precision after the tailstock mandrel is assembled. Therefore, it is necessary to provide a suitable method to improve this. Summary of the invention

[0003] The present invention provides a self-grinding driving method for the tailstock spindle of the core component of a high-precision heavy-duty horizontal lathe. The method is an on-site processing technology, which can well improve the installation accuracy of the tailstock center. The on-site processing technology is that in mechanical processing, some important surfaces are not fine-machined before assembly, and these surfaces are fine-machined on their own machine tools after assembly.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a method for driving the self-grinding of the tailstock spindle of the core component of a high-precision heavy-duty horizontal lathe, which is operated by a self-grinding driving device for the tailstock spindle of the core component of the high-precision heavy-duty horizontal lathe, the device comprising a tailstock body, a sleeve spindle assembly is arranged inside the tailstock body, and a spindle is arranged inside the sleeve spindle assembly; a first high-precision bearing, a second high-precision bearing and a third high-precision bearing are arranged in sequence from left to right at the step between the spindle and the inner side of the sleeve spindle assembly; a driving device is arranged on the tailstock body, and a driving wheel is arranged on the driving device, and the driving wheel is connected to a driven wheel by a V-belt; a spindle end face and a spindle taper hole are arranged on the grinding side of the spindle; a spindle taper hole self-grinding machine is installed on one side of the tailstock body, and a grinding wheel is arranged on the spindle taper hole self-grinding machine; the driving device is installed on a bottom plate; a side top device is arranged on the bottom plate, and the side top device is provided with an adjustment pad; a spacer is arranged on the driving wheel, and a pressure cover is arranged on the outside of the driving wheel.

[0005] Furthermore, the self-grinding driving method using the above device is as follows: according to the grinding parameter matching requirements, the self-grinding tailstock spindle speed is calculated, the driving wheel and the driven wheel that meet the required diameter are selected, the motor model that meets the required power is selected, the cycloid pinwheel speed reduction ratio is matched to meet the calculation result, and the driving wheel is started; according to the transmission ratio formula D1 / D2=n1 / n2, in the formula: D1 is the driving wheel diameter, D2 is the driven wheel diameter, n1 is the driving wheel speed, n2 is the driven wheel speed, and finally the speed of the driven wheel is calculated to meet the self-grinding requirements, the V-belt (11) specification is selected, and according to the formula L=n(90+a)D2 / 360+n(90-a)D1 / 360+(D2-D1) / (tan a×cos a), in the formula: L is the total length of the belt after it passes around the two pulleys, a is the belt half angle, D1 is the driving wheel diameter, D2 is the driven wheel diameter, and n represents the number of turns the belt passes around, the center distance is obtained.

[0006] Furthermore, the engagement height of the auxiliary drive device is calculated according to the center distance, and the bottom plate is used for installation and adjustment. The bottom plate is a connecting plate for the auxiliary drive device and the tailstock, and is designed as a long hole structure; the driving wheel and the driven wheel are adjusted to be in the same plane; the side top device is used to tighten the belt, and the adjustment pad is designed with an adjustment amount to avoid changes in the engagement height of the drive device due to process errors in each link, thereby affecting the center distance between the driving wheel and the driven wheel; the design requirements of the pressure cover and the spacer are to serve as the axial positioning of the driving wheel.

[0007] Furthermore, the driving device shown is equipped with a screw hole on the tailstock. After the position adjustment of the device in two directions is completed, the motor is started to drive the spindle to rotate, and then the spindle taper hole self-grinding machine is used to grind the spindle end face and spindle taper hole of the tailstock spindle.

[0008] The beneficial effect of the present invention is that in the method of the present invention, after the tailstock body is assembled, the precision of the tailstock end face and the tapered hole is ensured by self-grinding the end faces of the mandrel and the center and the tapered hole, thereby ensuring the high precision of the center. In this method, the error of the assembly link can be effectively eliminated, and finally the high-precision bearing inside the tailstock is used as a reference to drive the tailstock mandrel to rotate, so as to self-grind the end faces of the mandrel and the center of the tailstock, and the matching tapered hole of the mandrel and the center, and the precision is guaranteed by the high-precision bearing inside the tailstock. In actual operation, since the tailstock mandrel has no power source, the present invention designs a driving device, optimizes the appropriate transmission method according to the speed, torque and transmission ratio required for self-grinding, and determines the motor model of the driving device, the speed reduction ratio of the reducer and the size of each part. In the present invention, a belt drive method is adopted, a pulley is engaged at the front end of the mandrel, and a motor and a reducer assembly are engaged at the upper end of the tailstock, and the mandrel is driven to rotate by the pulley at the front end of the reducer. By adopting the method of the present invention, it has been verified through experiments that the accuracy of the high-precision bearing of the tailstock is no more than 0.002mm after self-grinding. Combined with the on-site measurement error, the final installation accuracy of the tailstock center is no more than 0.004mm, which reduces the generation of cumulative errors, meets the installation accuracy requirements of the machine center, and improves the accuracy of the tailstock center. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the structural diagram and motion diagram of the spindle assembly inside the tailstock.

[0010] Figure 2 It is a schematic diagram of the installation of the mandrel and the tailstock center.

[0011] Figure 3 It is an overall schematic diagram of the tailstock spindle self-grinding process method.

[0012] Figure 4 A schematic diagram of the structure of the driving device.

[0013] Explanation of the markings in the figure: 1. Tailstock body; 2. Sleeve mandrel assembly; 3. Mandrel; 4. Driving wheel; 5. Driven wheel; 6. Bottom plate; 7. Side top device; 8. Adjusting pad; 9. Pressure cover; 10. Spacer; 11. V-belt; 12. Mandrel end face; 13. Mandrel taper hole; 14. First high-precision bearing; 15. Second high-precision bearing; 16. Third high-precision bearing; 17. Grinding wheel; 18. Spindle taper hole self-grinding machine. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and examples to facilitate a better understanding of the present invention. Example

[0015] The self-grinding driving method of the tailstock spindle of the core component of the high-precision heavy-duty horizontal lathe in this embodiment adopts the following method: Figures 1 to 4The tailstock spindle self-grinding drive device of the core component of the high-precision heavy-duty horizontal lathe shown in the figure comprises a tailstock body 1, a sleeve spindle assembly 2 is arranged inside the tailstock body 1, and a spindle 3 is arranged inside the sleeve spindle assembly 2; the step between the spindle 3 and the inner side of the sleeve spindle assembly 2 is provided with a first high-precision bearing 14, a second high-precision bearing 15 and a third high-precision bearing 16 from left to right; a driving device is provided on the side of the tailstock body 1, and a driving wheel 4 is provided on the driving device, and the driving wheel 4 is connected to the driven wheel 5 by a V-belt 11; the spindle end face 12 and the spindle taper hole 13 are provided on the grinding side of the spindle 3. A spindle taper hole self-grinding machine 18 is installed on one side of the tailstock body 1, and a grinding wheel 17 is provided on the spindle taper hole self-grinding machine 18. The driving device is installed on the bottom plate 6, and a side top device 7 is provided on the bottom plate 6, and an adjustment pad 8 is provided on the side top device 7. A spacer sleeve 10 is provided on the driving wheel 4, and a pressure cover 9 is provided on the outside of the driving wheel 4.

[0016] The self-grinding driving method using the above device is as follows: according to the grinding parameter matching requirements, the self-grinding tailstock spindle speed is calculated to be 6-7r / min, and a motor with a driving wheel 4 diameter of Φ315mm and a driven wheel 5 diameter of Φ781mm and a power of 2.2Kw is selected. The cycloid pinwheel speed reduction ratio is matched to 87, which meets the calculation results, and the speed of the driving wheel 4 is 17.2r / min. According to the transmission ratio formula D1 / D2=n1 / n2, in the formula: D1 is the diameter of the driving wheel, D2 is the diameter of the driven wheel, n1 is the speed of the driving wheel, n2 is the speed of the driven wheel, and finally the speed of the driven wheel is calculated to be 6.89r / min, which meets the self-grinding requirements. The V-belt 11 specification is 4000mm. According to the formula L=n(90+a)D2 / 360+n(90-a)D1 / 360+(D2-D1) / (tan a×cos a), L is the total length of the belt after it passes around the two pulleys, a is the half angle of the belt, D1 is the diameter of the driving wheel, D2 is the diameter of the driven wheel, n represents the number of turns the belt passes around, and the center distance is 1123.72mm.

[0017] The height of the auxiliary drive device is calculated based on the center distance, and the final overall effect is: Figure 3 shown. Figure 4 The middle bottom plate 6 is a connecting plate for the auxiliary driving device and the tailstock, and is designed as a long hole structure for the purpose of facilitating adjustment so that the driving wheel 4 and the driven wheel 5 are in the same plane; Figure 4The side push device 7 of the push-pull integrated structure is used to tension the belt, and the adjustment pad 8 is designed with an adjustment amount to avoid changes in the engagement height of the drive device due to process errors in each link, thereby affecting the center distance between the driving wheel and the driven wheel. The design requirements of the pressure cover 9 and the spacer 10 are to serve as the axial positioning of the driving wheel. The drive device is equipped with engagement screw holes on the tailstock. After the position debugging of the device in two directions is completed, the motor is started to drive the spindle to rotate, and then the spindle taper hole self-grinding machine is used to grind the spindle end face 12 and the spindle taper hole 13 of the tailstock spindle.

[0018] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A self-grinding driving method for the tailstock spindle of a core component of a high-precision heavy-duty horizontal lathe, characterized in that: The method is an on-site processing technology, which is operated by a tailstock spindle self-grinding drive device, which is a core component of a high-precision heavy-duty horizontal lathe. The device comprises a tailstock body (1), wherein a sleeve spindle assembly (2) is arranged inside the tailstock body (1), and a spindle (3) is arranged inside the sleeve spindle assembly (2); a first high-precision bearing (14), a second high-precision bearing (15) and a third high-precision bearing (16) are arranged in sequence from left to right at the step between the spindle (3) and the inner side of the sleeve spindle assembly (2); a drive device is arranged on the tailstock body (1), and a driving wheel (4) is arranged on the drive device. The driving wheel (4) is connected to the driven wheel (5) by a V-belt (11); the grinding side of the spindle (3) is provided with a spindle end face (12) and a spindle tapered hole (13); a spindle tapered hole self-grinding machine (18) is installed on one side of the tailstock body (1), and a grinding wheel (17) is provided on the spindle tapered hole self-grinding machine (18); the driving device is installed on a base plate (6); a side top device (7) is provided on the base plate (6), and an adjustment pad (8) is provided on the side top device (7); a spacer (10) is provided on the driving wheel (4), and a pressure cover (9) is provided on the outside of the driving wheel (4).

2. The method for self-grinding and driving the tailstock spindle of a core component of a high-precision heavy-duty horizontal lathe according to claim 1 is characterized in that: The method for driving the self-grinding by using the above-mentioned device is as follows: according to the grinding parameter matching requirements, the rotation speed of the self-grinding tailstock spindle is calculated, the driving wheel (4) and the driven wheel (5) that meet the required diameter are selected, the motor model that meets the required power is selected, the cycloidal pinwheel speed reduction ratio is matched to meet the calculation result, and the driving wheel (4) is started; according to the transmission ratio formula D1 / D2=n1 / n2, in the formula: D1 is the driving pulley diameter, D2 is the driven pulley diameter, n1 is the driving pulley rotation speed, n2 is the driven pulley rotation speed, and finally the rotation speed of the driven pulley is calculated to meet the self-grinding requirements, the V-belt (11) specifications are selected, and according to the formula L=n(90+a)D2 / 360+n(90-a)D1 / 360+(D2-D1) / (tan a×cos a), in the formula: L is the total length of the belt after it passes around the two pulleys, a is the belt half angle, D1 is the driving wheel diameter, D2 is the driven wheel diameter, and n represents the number of turns the belt passes around, the center distance is obtained.

3. The method for self-grinding and driving the tailstock spindle of a core component of a high-precision heavy-duty horizontal lathe according to claim 2 is characterized in that: The engaging height of the auxiliary drive device is calculated according to the center distance, and is installed and adjusted by using a base plate (6), wherein the base plate (6) is a connecting plate for the engaging of the auxiliary drive device and the tailstock, and is designed as a long hole structure; the driving wheel (4) and the driven wheel (5) are adjusted to be in the same plane; the side top device (7) is used to tension the belt, and the adjusting pad (8) is designed with an adjustment amount to avoid changes in the engaging height of the drive device due to process errors in each link, thereby affecting the center distance between the driving wheel and the driven wheel; the design requirement of the pressure cover (9) and the spacer (10) is to serve as the axial positioning of the driving wheel.

4. The method for self-grinding and driving the tailstock spindle of a core component of a high-precision heavy-duty horizontal lathe according to claim 2 is characterized in that: The driving device shown is provided with a screw hole on the tailstock. After the position adjustment of the device in two directions is completed, the motor is started to drive the spindle to rotate, and then the spindle taper hole self-grinding machine is used to grind the spindle end face (12) and the spindle taper hole (13) of the tailstock spindle.

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