CN114290085A - A support structure for a column screw pair of a CNC machine tool - Google Patents

Abstract

The invention discloses a numerical control machine tool upright post screw pair supporting structure which comprises a ball screw pair, an upper end bearing seat and a lower end bearing seat, wherein the upper end of the ball screw pair is provided with the upper end bearing seat, the lower end of the ball screw pair is provided with the lower end bearing seat, the ball screw pair comprises a screw rod and a nut seat, the screw rod is arranged in the nut seat, the upper end of the screw rod is arranged in the upper end bearing seat, and the lower end of the screw rod is arranged in the lower end bearing seat. Adopt above-mentioned technical scheme to make a convenient and practical's digit control machine tool stand lead screw pair bearing structure. By adopting the structure of the upper-end precise angular contact ball bearing and the lower-end precise thrust angular contact ball bearing assembly, the bearing capacity of the lead screw pair is increased, and the service life of the machine tool can be effectively prolonged. The bearing adopts an installation mode of fixing one end and free the other end, so that the phenomenon of bearing rotation clamping stagnation caused by the heated extension of the screw rod during processing can be effectively avoided; and the requirement on the machining precision of the size in the vertical direction is reduced, and the manufacturing cost is saved.

Description

A support structure of a column screw pair of a CNC machine tool

technical field

The invention relates to the field of numerical control machine tools, in particular to a support structure of a column screw pair of a numerical control machine tool.

Background technique

With the continuous development of intelligent manufacturing, the requirements for machine tools as industrial mother machines are getting higher and higher. The column is the carrier of the headstock, the core component of the horizontal machining machine. It is mainly used to realize the movement of the headstock in the Y-axis direction; therefore, the bearing capacity, running accuracy and stability of the column directly affect the machining performance of the machine tool. At present, the transmission structure of the column is mainly in the form of a ball screw pair.

The support structure of the column screw pair is mainly composed of a high-precision angular contact ball bearing at the upper end and a high-precision composite bearing at the lower end. Such a combined structure can meet the requirements of accuracy, but the bearing capacity is relatively limited, and some users have already damaged the lower end bearing during use; if this structure is still used, only larger specifications of high-precision composite materials can be selected. Bearings are used to meet load-bearing requirements, resulting in increased costs and reduced competitiveness of machine tools.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems, the present invention provides a convenient and practical support structure for a column-screw pair of a CNC machine tool.

A support structure of a CNC machine tool column screw pair in the present invention includes a ball screw pair, an upper end bearing seat and a lower end bearing seat. The upper end of the ball screw pair is provided with an upper end bearing seat, and the lower end of the ball screw pair is provided with an upper end bearing seat. There is a lower end bearing seat, the ball screw pair includes a screw rod and a nut seat, the screw rod is arranged in the nut seat, the upper end of the screw rod is installed in the upper end bearing seat, and the lower end of the screw rod is installed in the lower end inside the bearing housing.

In the above solution, the upper end of the screw rod includes an upper bearing installation step, an upper bearing installation section and an upper bearing retaining ring groove, an upper bearing installation section is arranged on the upper bearing installation step, and an upper bearing installation section is arranged on the upper bearing installation section. There is an upper bearing retaining ring groove, the upper bearing mounting section is provided with a precision angular contact bearing, the inner ring at the lower end of the precision angular contact bearing is positioned and fixed by the upper bearing installation step, and the upper bearing seat bottom is provided with an upper end positioning pin.

In the above solution, a bearing retaining ring is arranged in the groove of the upper bearing retaining ring, and the inner ring of the upper end of the precision angular contact ball bearing is positioned and fixed.

In the above solution, the lower end of the screw rod comprises a lower bearing installation step, a lower bearing installation section and a threaded section, the lower bearing installation step is provided with a lower bearing installation section, and the lower bearing installation section is provided with a threaded section, A high-precision thrust angular contact ball bearing is arranged on the lower end bearing mounting section, a bearing seat cover plate is fixed at the lower end of the lower end bearing seat, and a lower end positioning pin is installed on the bottom of the lower end bearing seat.

In the above solution, the lower end bearing seat is provided with a bearing seat flange, the bearing seat flange is provided with a sealing ring groove, and the sealing ring groove is provided with a sealing ring.

In the above solution, a locking nut is installed at the threaded section, and the locking nut positions and fixes the high-precision thrust angular contact ball bearing through a washer.

In the above solution, a sealing end cover is installed in the middle of the lower end bearing seat.

The advantages and beneficial effects of the present invention are as follows: the present invention provides a convenient and practical support structure for a column screw pair of a CNC machine tool. The screw pair support bearing of this scheme adopts the structure of the upper end precision angular contact ball bearing and the lower end high precision thrust angular contact ball bearing assembly, which increases the bearing capacity of the screw pair and can effectively increase the service life of the machine tool. The bearing adopts the installation method of "fixed at one end and free at the other end", which can effectively avoid the bearing rotation jam caused by the heating and elongation of the screw during processing; and reduce the machining accuracy requirements for the vertical dimension, saving manufacturing costs.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the enlarged schematic diagram of A part;

Figure 3 is an enlarged schematic view of part B.

In the figure: 1. Ball screw pair 11, screw 12, nut seat 101, upper bearing installation step 102, upper bearing installation section 103, upper bearing retaining ring groove 104, lower bearing installation step 105, lower bearing installation section 106 , thread section 2, upper bearing seat 3, lower bearing seat 4, precision angular contact bearing 5, upper positioning pin 6, bearing retaining ring 7, high precision thrust angular contact ball bearing 8, bearing seat cover 9, lower positioning pin 10 , bearing seat flange 13, sealing ring 14, locking nut 15, washer 16, sealing end cover

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and embodiments. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

As shown in Figure 1, the present invention is a support structure of a CNC machine tool column screw pair, comprising a ball screw pair 1, an upper end bearing seat 2 and a lower end bearing seat 3, the upper end of the ball screw pair 1 is provided with an upper end bearing seat 2, The lower end of the ball screw pair 1 is provided with a lower end bearing seat 3, the ball screw pair 1 includes a screw rod 11 and a nut seat 12, the screw rod 11 is arranged in the nut seat 12, and the upper end of the screw rod 11 is installed in the upper end bearing seat 2, The lower end of the lead screw 11 is installed in the lower end bearing seat 3 , and the rotation of the lead screw 11 can be converted into a linear movement of the nut seat 12 along the lead screw 11 .

As shown in FIG. 2, the upper end of the screw rod includes an upper bearing installation step 101, an upper bearing installation section 102 and an upper bearing retaining ring groove 103. The upper bearing installation step 101 is provided with an upper bearing installation section 102 and an upper bearing installation section 102. There is an upper bearing retaining ring groove 103 on it, a precision angular contact bearing 4 is arranged on the upper bearing installation section 102, the inner ring at the lower end of the precision angular contact bearing 4 is positioned and fixed by the upper bearing installation step 101, and the bottom of the upper bearing seat 2 is provided with Top positioning pin 5. The upper bearing retaining ring groove 103 is provided with a bearing retaining ring 6 for positioning and fixing the inner ring of the upper end of the precision angular contact ball bearing 4 .

As shown in FIG. 3 , the lower end of the screw includes a lower bearing installation step 104 , a lower bearing installation section 105 , and a threaded section 106 , a lower bearing installation section 105 is arranged under the lower bearing installation step 104 , and a thread is arranged under the lower bearing installation section 105 Section 106, the lower end bearing installation section 105 is provided with high-precision thrust angular contact ball bearings 7, in this case three high-precision thrust angular contact ball bearings 7 are used, which are installed in sequence from top to bottom; the lower end of the lower end bearing seat 3 is fixed There is a bearing seat cover plate 8 , and a lower end positioning pin 9 is installed on the bottom of the lower end bearing seat 3 . A bearing seat flange 10 is fixed on the lower end bearing seat 3, a sealing ring groove is arranged in the bearing seat flange 10, and a sealing ring 13 is arranged in the sealing ring groove. A lock nut 14 is installed at the threaded section 106 , and the lock nut 14 positions and fixes the high-precision thrust angular contact ball bearing 7 through the washer 15 . A sealing end cover 16 is installed in the middle of the lower end bearing seat 3 .

The function of the ball screw pair 1: the main part of the transmission mechanism of the column, converts the rotary motion of the servo motor into linear motion, so as to realize the movement of the headstock in the Y-axis direction.

The function of the upper bearing seat 2: supporting the precision angular contact bearing and ensuring the rotation accuracy of the bearing;

The function of the lower bearing seat 3: support the high-precision thrust angular contact ball bearing assembly and ensure the rotation accuracy of the bearing assembly;

The function of precision angular contact bearing 4: support the upper end of the ball screw pair, bear various forces transmitted by the column, the main shaft box, etc., reduce the friction when the screw rotates, and ensure the rotation accuracy of the screw;

The function of the upper end positioning pin 5: used for the positioning of the upper end bearing seat during installation, to ensure the positional accuracy of the upper end bearing seat during repeated disassembly and assembly;

The function of the bearing retaining ring 6: the fixing of the inner ring of the upper bearing of the precision angular contact bearing.

The function of high-precision thrust angular contact ball bearing 7: support the upper end of the ball screw pair, bear various forces transmitted from the column, the spindle box, etc., reduce the friction when the screw rotates, and ensure the rotation accuracy of the screw;

The function of the bearing seat cover plate 8: to protect the inside of the lower bearing seat and prevent the entry of iron filings, cutting fluid, etc.;

The function of locking the positioning pin 9 at the lower end: it is used for the positioning of the lower bearing seat during installation to ensure the positional accuracy of the lower bearing seat during repeated disassembly and assembly;

The function of the bearing seat flange 10: the positioning of the outer ring of the uppermost high-precision thrust angular contact ball bearing;

The function of the sealing ring 13: to prevent the entry of dust, etc., thereby affecting the accuracy of the high-precision thrust angular contact ball bearing;

The function of the tightening nut 14: keep the high-precision thrust angular contact ball bearing assembly fixed, and apply a certain degree of pre-tightening force to the bearing assembly;

The function of the washer 15: the positioning of the inner ring of the lowermost high-precision thrust angular contact ball bearing;

The function of the sealing end cover 16: to prevent the entry of dust, etc., thereby affecting the accuracy of the high-precision thrust angular contact ball bearing.

Install the precision angular contact ball bearing on the bearing installation section of the screw part of the upper end of the ball screw pair, the lower inner ring of the bearing is positioned and fixed by the bearing installation step, and the upper inner ring of the bearing is positioned and fixed by the bearing retaining ring; The upper part of the rod part, together with the fixed bearing, is installed into the installation hole of the upper bearing seat.

Insert the sealing ring into the sealing ring groove of the bearing seat flange; then install the bearing seat flange, the bearing group composed of 3 high-precision thrust angular contact ball bearings, washers and lock nuts into the lower end wire of the ball screw pair in turn On the rod part, the lock nut exerts a certain pre-tightening force on the bearing group through the washer, and the washer positions and fixes the inner ring of the lowermost bearing. Install the lower end of the ball screw sub-screw part, together with the installed and fixed bearing group, into the mounting hole of the lower bearing seat; then fix the bearing seat flange, sealing end cover and bearing seat cover plate on the lower bearing seat in turn superior.

After calibration, after the ball screw pair meets the accuracy requirements, fix the upper nut seat and the lower nut seat on the column, and use the upper end positioning pin and the lower end positioning pin to position the nut seat respectively to complete the installation of the ball screw pair support assembly . Through the pulley assembly or the coupling as the medium, the rotation of the servo motor can be transmitted to the screw part of the ball screw pair. If the spindle box is connected to the nut seat of the ball screw pair, the spindle box can be realized. Linear motion in the Y-axis direction.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (7)

1. A CNC machine tool column screw pair supporting structure, characterized in that it comprises a ball screw pair, an upper end bearing seat and a lower end bearing seat, the upper end of the ball screw pair is provided with an upper end bearing seat, and the ball screw pair is provided with an upper end bearing seat. The lower end is provided with a lower end bearing seat, the ball screw pair includes a screw rod and a nut seat, the screw rod is arranged in the nut seat, the upper end of the screw rod is installed in the upper end bearing seat, and the lower end of the screw rod is installed in the lower bearing housing. 2 . The support structure of a column screw pair of a CNC machine tool according to claim 1 , wherein the upper end of the screw rod comprises an upper bearing installation step, an upper bearing installation section and an upper bearing retaining ring groove, 2 . The upper bearing installation step is provided with an upper bearing installation section, the upper bearing installation section is provided with an upper bearing retaining ring groove, the upper bearing installation section is provided with a precision angular contact bearing, and the lower end of the precision angular contact bearing is provided. The inner ring is positioned and fixed by the upper bearing installation step, and the upper end locating pin is provided at the bottom of the upper bearing seat. 3 . The support structure of a column screw pair of a CNC machine tool according to claim 2 , wherein a bearing retaining ring is arranged in the groove of the upper bearing retaining ring, and the inner ring of the upper end of the precision angular contact ball bearing is positioned and fixed. 4 . . 4 . The support structure of a CNC machine tool column screw pair according to claim 1 , wherein the lower end of the screw comprises a lower bearing installation step, a lower bearing installation section, and a thread section, and the lower bearing installation step There is a lower bearing installation section below, a threaded section is arranged under the lower bearing installation section, a high-precision thrust angular contact ball bearing is arranged on the lower bearing installation section, and the lower end of the lower bearing seat is fixed with a bearing seat cover plate , the bottom of the lower end bearing seat is installed with a lower end positioning pin. 5 . The support structure of a column screw pair of a CNC machine tool according to claim 4 , wherein a bearing seat flange is arranged on the lower end bearing seat, and a sealing ring groove is arranged in the bearing seat flange. 6 . , the sealing ring groove is provided with a sealing ring. 6 . The support structure of a column screw pair of a CNC machine tool according to claim 4 , wherein a locking nut is installed at the threaded section, and the locking nut attaches the high-precision thrust angular contact ball bearing to the high-precision thrust angular contact ball bearing through a washer. 7 . Fixed positioning. 7 . The support structure for a column screw pair of a CNC machine tool according to claim 4 , wherein a sealing end cover is installed in the middle of the lower end bearing seat. 8 .

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