Preload displacement detection device suitable for machine tool equipment main shaft and adopting angular contact bearing structure form

Abstract

The utility model discloses a preload displacement detection device which is suitable for a machine tool equipment main shaft and adopts an angular contact bearing structure form. The preload displacement detection device comprises a press machine and a bearing seat, the bearing seat comprises an upper cover, a bearing sleeve and a lower seat, the bearing sleeve is of a cylinder structure, mounting grooves communicated with an inner hole of the cylinder are formed in the end faces of the two ends of the cylinder, and the two bearings are placed in the mounting grooves respectively and fixed through the upper cover and the lower seat respectively. During detection, the bearing seat provided with the bearing is placed on a press workbench, a press piston rod moves downwards, the steel ball placed in the groove of the upper cover is wrapped by the groove in the piston rod, and when the pressure value of the pressure gauge is equal to the pressure value F corresponding to the pressure intensity P of a bearing press system, the height of the inner ring and the height of the outer ring of the bearing are measured through the lever dial indicator. And calculating the height difference between the inner and outer rings. The device can improve the precision of bearing assembly and ensure the reliability of installation, so that the economic loss caused by repeated disassembly due to the fact that the preload does not meet the requirement in the installation process of the bearing is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe spindle bearing assembly technical field, specifically is a kind of pre-load displacement detection device suitable for lathe equipment main shaft adopts angular contact bearing structure form. BACKGROUND

[0002] Since the purchased bearing no matter how high precision exists respective tolerance and play for each bearing, and there is certain manufacturing error and assembly error. Therefore, when assembling spindle bearing, certain amount of pre-load must be applied to spindle bearing, to ensure the rigidity of bearing after assembly, improve the rotation precision and load capacity of bearing.

[0003] Generally, the height difference of bearing inner and outer spacer is calculated by worker's assembly experience and technical personnel to control the size of bearing pre-load. But the two methods have installation risk, the first method, worker's experience needs long-term accumulation, and is not necessarily reliable. The second method, the manufacturing of bearing exists tolerance, and error also appears when calculating.

[0004] If pre-load does not reach the requirement through the above two methods of assembly, the precision of main shaft after assembly is out of tolerance, and main shaft cannot bear larger load. So main shaft bearing and parts must be disassembled to adjust the height difference of bearing inner and outer spacer again, but the disassembled bearing and parts have the risk of damage, bearing cannot be reused, so the cost of main shaft assembly increases. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of pre-load displacement detection device suitable for lathe equipment main shaft adopts angular contact bearing structure form, including press and bearing seat.

[0006] The bearing seat includes upper cover, bearing sleeve and lower seat.

[0007] The bearing sleeve is hollow cylindrical structure, and a plurality of measuring holes are arranged on the cylinder, and installation slot communicated with the inner hole of the cylinder is arranged on the end face of the both ends of the cylinder, and installation slot I and installation slot II are respectively marked.

[0008] Two bearings are respectively placed in installation slot I and installation slot II, and the bearing placed in installation slot I is fixed by upper cover, and the bearing placed in installation slot II is fixed by lower seat.

[0009] The upper cover is cylindrical structure, and the column body is embedded in the inner hole of bearing, and a recess I is arranged on the end face of the upper cover away from bearing. The lower seat is ladder type rotary body structure, and the upper column body is embedded in the inner hole of bearing.

[0010] The press includes press bed, pressure gauge, piston rod, control box, steel ball, workbench and lever micrometer.

[0011] The piston rod is arranged on the press machine body opposite to the workbench, and a groove II is arranged in the center of the end face of the end of the piston rod facing the workbench.

[0012] The bearing seat equipped with the bearing is placed on the workbench.

[0013] The steel ball is placed in the groove I of the upper cover and is aligned with the groove II on the piston rod. In the detection state, the piston rod moves downward, and the steel ball is located in the groove I and the groove II.

[0014] In the state that the pressure value of the pressure gauge is equal to the pressure value F corresponding to the bearing pressure machine system pressure P, the measuring needle of the lever micrometer penetrates through the measuring hole on the bearing sleeve and contacts the outer ring plane or the inner ring plane of the bearing.

[0015] Further, the sizes of the mounting groove I and the mounting groove II are matched with the size of the bearing.

[0016] Further, the fitting tolerance between the outer circle of the bearing and the bearing sleeve is transition fitting.

[0017] Further, the fitting tolerance between the inner hole of the bearing and the upper cover is transition fitting.

[0018] Further, the fitting tolerance between the inner hole of the bearing and the lower seat is transition fitting.

[0019] Further, in the detection state, the bearing seat is placed on the workbench, the lower seat contacts the workbench, and the upper cover contacts the piston rod.

[0020] Further, three measuring holes are arranged on the side wall of the bearing sleeve at intervals, and the arrangement direction of the measuring holes is parallel to the axial direction of the bearing sleeve.

[0021] Further, the lever micrometer is equipped on the micrometer stand, and the micrometer stand is arranged on the workbench.

[0022] The technical effect of the machine tool main shaft angular contact bearing pre-load displacement detection device is self-evident, and the beneficial effects are as follows.

[0023] The machine tool main shaft angular contact bearing pre-load displacement detection device changes the calculation method of the pre-load force of the inner and outer rings of the traditional main shaft bearing through calculation and experience, the device has been applied to the equipment repair process, and good effects have been achieved, the precision of the main shaft bearing assembly is improved, the reliability of the installation of the main shaft bearing is ensured, and the risk of repeated disassembly of the bearing due to the fact that the pre-tightening force does not meet the requirements in the reinstallation process of the main shaft bearing is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view (front view) of the pre-load displacement detection device.

[0025] Figure 2 It is the structural schematic view (side view) of the pre-load displacement detection device of the utility model.

[0026] Figure 3 It is the assembly schematic view of the bearing seat.

[0027] In the figure: 1 - the pressure machine bed; 2 - pressure gauge; 3 - piston rod; 4 - control box; 5 - steel ball; 6 - bearing; 7 - upper cover; 8 - bearing sleeve; 9 - lower seat; 10 - workbench; 11 lever micrometer; 12 - measuring hole. DETAILED DESCRIPTION

[0028] The utility model will be further described below in conjunction with examples, but should not be understood as the above-mentioned subject range of the utility model is limited to the following examples. According to the ordinary technical knowledge and conventional means in the art, make various substitutions and changes without departing from the above-mentioned technical thought of the utility model, all should be included in the protection scope of the utility model.

[0029] Example 1:

[0030] A pre-load displacement detection device suitable for the main shaft of machine tool equipment adopts angular contact bearing structure form, including pressure machine and bearing seat.

[0031] The bearing seat includes upper cover 7, bearing sleeve 8 and lower seat 9.

[0032] The bearing sleeve 8 is hollow cylindrical structure, and the cylinder is provided with a plurality of measuring holes 12, and the end faces of both ends of the cylinder are provided with installation grooves communicating with the inner holes of the cylinder, respectively marked as installation groove I and installation groove II.

[0033] Two bearings 6 are placed in installation groove I and installation groove II respectively, the bearing 6 placed in installation groove I is fixed through upper cover 7, and the bearing 6 placed in installation groove II is fixed through lower seat 9.

[0034] The upper cover 7 is cylindrical structure, and the column body is embedded in the inner hole of the bearing, and a groove I is arranged in the center of the end face of the upper cover 7 away from the bearing. The lower seat 9 is a stepped rotary body structure, and the upper column body is embedded in the inner hole of the bearing.

[0035] The pressure machine includes pressure machine bed 1, pressure gauge 2, piston rod 3, control box 4, steel ball 5, workbench 10 and lever micrometer 11.

[0036] The pressure gauge 2 and control box 4 are assembled on the pressure machine bed 1.

[0037] The piston rod 3 is arranged on the pressure machine bed 1 opposite to the workbench 10, and a groove II is arranged in the center of the end face of the end of the piston rod 3 facing the workbench 10.

[0038] The bearing seat equipped with the bearing 6 is placed on the workbench 10.

[0039] The steel ball 5 is placed in the groove I of the upper cover 7 and is aligned with the groove II on the piston rod 3. In the detection state, the piston rod 3 is lowered, and the steel ball 5 is located in the groove I and the groove II.

[0040] When the pressure value of the pressure gauge 2 is equal to the pressure value F corresponding to the bearing 6 pressure machine system pressure P, the measuring needle of the lever micrometer 11 penetrates through the measuring hole 12 on the bearing sleeve 8 and contacts the outer ring plane or the inner ring plane of the bearing 6 to measure the height of the inner and outer rings of the bearing 6, so as to calculate the height difference of the inner and outer rings.

[0041] Embodiment 2:

[0042] The main structure of the embodiment is the same as that of embodiment 1, and further, when the pressure value F of the pressure gauge 2 is equal to the pressure value corresponding to the bearing 6 pressure machine system pressure P, the height of the inner and outer rings of the bearing 6 is measured by the lever micrometer 11, and the height difference of the inner and outer rings is calculated. Then, the inner and outer rings of the main shaft bearing 6 are ground by using a surface grinder to reach the corresponding size. After the main shaft bearing 6 is assembled, the cap is tightened and locked to ensure that the main shaft bearing 6 can have a matching pre-load.

[0043] Embodiment 3:

[0044] The main structure of the embodiment is the same as that of any one of embodiments 1-2, and further, the sizes of the mounting groove I and the mounting groove II are matched with the size of the bearing 6.

[0045] Embodiment 4:

[0046] The main structure of the embodiment is the same as that of any one of embodiments 1-3, and further, the fitting tolerance between the outer circle of the bearing 6 and the bearing sleeve 8 is a transition fit.

[0047] Embodiment 5:

[0048] The main structure of the embodiment is the same as that of any one of embodiments 1-4, and further, the fitting tolerance between the inner hole of the bearing 6 and the upper cover 7 is a transition fit.

[0049] Embodiment 6:

[0050] The main structure of the embodiment is the same as that of any one of embodiments 1-5, and further, the fitting tolerance between the inner hole of the bearing 6 and the lower seat 9 is a transition fit.

[0051] Embodiment 7:

[0052] The main structure of the embodiment is the same as any one of embodiments 1-6, and further, in the detection state, the bearing seat is placed on the workbench 10, the lower seat 9 is in contact with the workbench 10, and the upper cover 7 is in contact with the piston rod 3.

[0053] Embodiment 8:

[0054] The main structure of the embodiment is the same as any one of embodiments 1-7, and further, three measuring holes 12 are arranged on the side wall of the bearing sleeve 8, and the arrangement direction of the measuring holes 12 is parallel to the axial direction of the bearing sleeve 8.

[0055] The measuring holes are used for measuring the height of the inner and outer rings of the angular contact bearing by the lever dial gauge.

[0056] Embodiment 9:

[0057] The main structure of the embodiment is the same as any one of embodiments 1-8, and further, the lever dial gauge 11 is assembled on the dial gauge stand, and the dial gauge stand is arranged on the workbench 10.

[0058] Embodiment 10:

[0059] The main structure of the embodiment is the same as any one of embodiments 1-9, and further, the detection method of the detection device comprises the following steps:

[0060] 1) Place two bearings 6 in the installation groove I and the installation groove II respectively, and then fix the bearings 6 on the bearing seat 8 through the upper cover 7 and the lower seat 9 respectively;

[0061] 2) Place the bearing seat 8 assembled with the bearing 6 on the workbench 10;

[0062] 3) Place the steel ball 5 in the groove I of the upper cover 7, and adjust the position of the bearing seat 8 so that the steel ball 5 is aligned with the groove II on the piston rod 3;

[0063] 4) Turn on the power of the press and the oil pump motor through the control box 4, press the manual lowering button, drive the piston rod 3 to descend, and when the pressure value F of the pressure gauge 2 is equal to the pressure value corresponding to the pressure P of the bearing 6 press system, measure the height of the inner and outer rings of the bearing 6 by the lever dial gauge 11.

[0064] Embodiment 11:

[0065] The main structure of the embodiment is the same as any one of embodiments 1-10, and further, the calculation formula of the height difference between the inner and outer rings of the bearing 6 is as follows:

[0066]

[0067] ΔH = |H1-H2|

[0068] In the formula: H1 is the average inner ring height;

[0069] H2 is the average outer ring height;

[0070] ΔH is the height difference between the inner and outer rings;

[0071] n represents the number of measurements;

[0072] h 1i Let be the inner circle height value obtained from the i-th measurement, where i = 1, 2, ..., n;

[0073] h 2i Let be the outer ring height value obtained from the i-th measurement, where i = 1, 2, ..., n.

[0074] Example 12:

[0075] The main structure of this embodiment is the same as any one of embodiments 1 to 11. Furthermore, the key design points of the detection device are as follows:

[0076] 1. Design the bearing housing; see appendix. Figure 3 .

[0077] 2. Conduct overall control design of the machine tool spindle angular contact bearing preload displacement detection device, see attached document. Figure 1 , 2 .

[0078] 3. Instructions on the method for using a machine tool spindle angular contact bearing preload displacement detection device.

[0079] Based on the spindle bearing model, first determine the bearing's outer diameter, inner diameter, and thickness. Also, understand the bearing assembly configuration, whether it's face-to-face or back-to-back assembly.

[0080] Secondly, based on the bearing dimensions, according to the attached... Figure 3 The upper cover 7, bearing sleeve 8, and lower seat 9 are designed as bearing housings. The fit tolerance between the outer circle of bearing 6 and bearing sleeve 8 is required to be a transition fit, and the fit tolerance between the inner hole of bearing 6 and the upper cover 7 and lower seat 9 is also required to be a transition fit.

[0081] Then attach the bearing 6, the upper cover 7, the bearing sleeve 8, and the lower seat 9. Figure 2 The requirements are assembled together to form Figure 2 The bearing housing assembly drawing is shown.

[0082] Finally, place the assembled bearing housing on the attached... Figure 1 Place the steel ball 5 on the worktable 10 of the medium-pressure press, and align it with the groove I of the bearing housing cover 7, which is aligned with the groove II of the press piston rod 3. This ensures that the force of the press is applied to the center of the bearing housing 8.

[0083] Based on the model and inner diameter of bearing 6, refer to Appendix 1 to find the corresponding system pressure P value of the press.

[0084] Through the press control box 4, open the press power, open the oil pump motor, press the hand down button, make the press piston rod 3 down, when the press pressure gauge 2 reaches the corresponding press system pressure P value, use the lever dial gauge 11 to measure the height of the bearing 6 inner and outer ring.

[0085] When measuring, the dial gauge 11 pointer is required to contact the bearing outer ring plane or inner ring plane through the 3 holes of the bearing sleeve 8, and the dial gauge base is required to slide on the press workbench 10. The height of the bearing 6 inner and outer ring is measured from the 3 measurement holes of the bearing sleeve 8 respectively, and recorded. Then, the sum of the 3 recorded values of the outer ring or the inner ring is divided by 3 to obtain the average height value of the inner ring or the outer ring. Finally, the average height value of the outer ring minus the average height value of the inner ring equals the inner and outer ring height difference.

[0086] In summary, the height difference of the inner and outer spacer rings of the bearing assembly under the load with matching preload is detected, and the inner and outer spacer rings of the spindle bearing are ground using a surface grinder to achieve the corresponding size. After the spindle bearing is assembled, the cap is tightened and locked to ensure that the spindle bearing has matching preload.

[0087] Table 1 Angle contact preload F and press system pressure P corresponding relationship table

[0088]

[0089]

[0090] Example 13

[0091] The main structure of this embodiment is the same as any one of examples 1-12. Further, the detection device is mainly used to detect the displacement of the machine tool equipment spindle angular contact bearing under load preload, and to determine the height difference value of the inner and outer spacer rings of the machine tool equipment spindle angular contact bearing. It changes the traditional way of calculating the preload force of the inner and outer rings of the spindle bearing by calculation and experience. The device is successfully applied to the equipment repair spindle assembly process, and good economic benefits are achieved, the precision of the spindle bearing assembly is improved, the reliability of the spindle bearing installation is ensured, and the economic loss caused by repeated disassembly of the bearing due to the failure of the preload during the installation process is reduced.

Claims

1. A pre-load displacement detection device for a main shaft of a machine tool device using an angular contact bearing structure, characterized by: The pressure machine and the bearing seat are included; The bearing seat includes an upper cover (7), a bearing sleeve (8) and a lower seat (9); The bearing sleeve (8) is a hollow cylindrical structure, and a plurality of measuring holes (12) are arranged on the cylinder, and installation grooves I and II are arranged on the end faces of the two ends of the cylinder and communicated with the inner holes of the cylinder; Two bearings (6) are respectively arranged in the installation grooves I and II, the bearing (6) arranged in the installation groove I is fixed through the upper cover (7), and the bearing (6) arranged in the installation groove II is fixed through the lower seat (9); The upper cover (7) is a cylindrical structure, the column body is embedded in the inner hole of the bearing, and a groove I is arranged on the center of the end face away from the bearing; the lower seat (9) is a stepped rotary body structure, and the upper column body is embedded in the inner hole of the bearing; The pressure machine includes a pressure machine bed (1), a pressure gauge (2), a piston rod (3), a control box (4), a steel ball (5), a workbench (10) and a lever micrometer (11); The piston rod (3) and the workbench (10) are arranged on the pressure machine bed (1) in opposition, and a groove II is arranged on the center of the end face of the end of the piston rod (3) facing the workbench (10); The bearing seat assembled with the bearing (6) is arranged on the workbench (10); The steel ball (5) is arranged in the groove I of the upper cover (7) and aligned with the groove II on the piston rod (3), and in the detection state, the piston rod (3) moves downward, and the steel ball (5) is located in the groove I and the groove II; In the state that the pressure value of the pressure gauge (2) is equal to the pressure value F corresponding to the pressure P of the bearing (6) pressure machine system, the measuring needle of the lever micrometer (11) penetrates through the measuring hole (12) on the bearing sleeve (8) and contacts the outer ring plane or the inner ring plane of the bearing (6).

2. A pre-load displacement detection device for a main shaft of a machine tool device according to claim 1, characterized in that: The sizes of the installation grooves I and II are matched with the size of the bearing (6).

3. A pre-load displacement detection device for a main shaft of a machine tool device according to claim 1, characterized in that: The cooperation tolerance between the outer circle of the bearing (6) and the bearing sleeve (8) is transition fit.

4. A pre-load displacement detection device for a main shaft of a machine tool according to claim 1, characterized in that: The cooperation tolerance between the inner hole of the bearing (6) and the upper cover (7) is transition fit.

5. A pre-load displacement detection device for a main shaft of a machine tool according to claim 1, characterized in that: The cooperation tolerance between the inner hole of the bearing (6) and the lower seat (9) is transition fit.

6. A pre-load displacement detection device for a main shaft of a machine tool according to claim 1, characterized in that: In the detection state, the bearing seat is arranged on the workbench (10), the lower seat (9) contacts the workbench (10), and the upper cover (7) contacts the piston rod (3).

7. A pre-load displacement detection device for a main shaft of a machine tool according to claim 1, characterized in that: Three measuring holes (12) are arranged on the side wall of the bearing sleeve (8) at intervals, and the arrangement direction of the measuring holes (12) is parallel to the axial direction of the bearing sleeve (8).

8. A pre-load displacement detection device for a main shaft of a machine tool according to claim 1, characterized in that: The lever micrometer (11) is assembled on the micrometer stand, and the micrometer stand is arranged on the workbench (10).

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