CN104034522B - Experiment table for detecting static rigidity of rolling linear guide rail pair - Google Patents

Abstract

The invention discloses an experimental platform for detecting the static stiffness of a rolling linear guide rail pair, which comprises a guide rail auxiliary mounting plate and left and right supports installed on a T-shaped groove platform, a test guide rail installed on the guide rail auxiliary mounting plate, and a pressure plate fixed Avoid crushing the slider when directly loading on the slider of the test guide rail. The force beam spans and is fixed on the left and right supports, and is loaded through the loading bolt. The loading force is controlled and measured by the load cell, and the deformation The quantity is measured by an electric probe. There are three screw holes on the force beam and the left support, which can apply vertical load, rolling moment and horizontal load respectively, and move the slider and pressure plate of the test guide rail to apply overturning moment and rotation moment. The device realizes the static stiffness detection of the rolling linear guide pair under five kinds of loads, and conforms to the actual installation conditions of the guide rail, and the loading method is simple and reliable.

Description

An Experimental Bench for Testing the Static Stiffness of a Rolling Linear Guideway

technical field

The invention relates to a device for detecting the performance of a rolling linear guide rail pair, in particular to a device for detecting the static stiffness of a rolling linear guide rail pair.

Background technique

CNC machine tools are the "workhorses" of the high-end equipment manufacturing industry. The possession and development level of CNC machine tools in a country in the world today is an important guarantee for its industrial modernization and comprehensive national strength. Among the various performances of CNC machine tools, static stiffness is an important technical index, which refers to the ability of the machine tool to resist deformation when it is under load. The static deformation of the machine tool will not only cause a certain processing error, but also affect the vibration resistance, wear, heat and working life of the machine tool. Therefore, it is of practical significance for machine tool design to test its static stiffness in the design stage of the machine tool and then optimize the structure.

The rolling linear guide rail pair is generally composed of guide rails, sliders, rolling elements, reversers and cages. It is a new type of rolling support for relative reciprocating linear motion. It can be replaced by steel ball rolling between the slider and the guide rail. Direct sliding contact, and the rolling elements can achieve infinite circulation in the guide rail and slider with the help of reversers. The rolling linear guide pair has the advantages of small friction coefficient, high running accuracy, no crawling, high rigidity, etc., and is widely used as the guiding function component of high-precision CNC machine tools and machining centers.

In order to accurately predict the static stiffness of the machine tool, it is necessary to detect and analyze the static stiffness of the rolling linear guide pair first. At present, well-known foreign guide rail manufacturers such as Japan's THK Company, NSK Company, and Sweden's SKF Company have advanced rolling linear guide rail sub-professional testing equipment, but due to technical blockade, detailed information cannot be obtained. Domestic research on the static stiffness of rolling linear guides is mainly through theoretical modeling to obtain some calculation formulas, and few people have conducted experiments on the static stiffness of guide rails. Fang Jian from Huazhong University of Science and Technology introduced a computer-controlled rolling linear guide pair static stiffness test machine in "Rolling Linear Guide Rail Pair Performance Analysis and Static Stiffness Testing Machine Development". The sensor and the inductive displacement sensor measure the loading force and deformation respectively, and then obtain the static stiffness curve of the guide rail pair. The existing static stiffness calculation formulas set some assumptions, so there may be a large error between the calculation results and the actual ones, and the static stiffness testing machine developed by Fang Jian can only apply vertical loads to the guide rail pair, so the obtained static stiffness Stiffness is also static stiffness under vertical load.

Contents of the invention

The purpose of the present invention is to provide a simple and reliable experimental device that conforms to the actual installation conditions of the guide rail and the loading method, which can realize the static stiffness detection of the rolling linear guide pair under the following five loads: Referring to Figure 1, the rolling linear guide The pair only moves in the X direction, and the movement in the other two directions and the rotation around the three coordinate axes are restricted. The forces and moments are respectively the horizontal load F _Y , the rotation moment M _Z , and the rolling moment M _X , the vertical load F _Z , the overturning moment M _Y , the corresponding offset and deflection are respectively the offset α ₁ in the horizontal direction, the deflection α _{2 around the Z axis, the deflection α 3 around} the X axis, and the offset α ₄ in the vertical direction , the deflection α ₅ around the Y axis.

To achieve the above object, the present invention is achieved by taking the following technical solutions:

An experimental bench for detecting the static stiffness of a rolling linear guide rail pair, comprising a guide rail pair positioning and clamping device, a loading device and a deformation detection device arranged on a T-shaped groove platform, characterized in that the guide rail pair positioning and clamping device includes a The auxiliary mounting plate of the guide rail is fixed longitudinally in the middle of the upper surface of the T-slot platform along the T-shaped slot platform. The auxiliary mounting plate of the guide rail is provided with two horizontally stepped planes and a vertical positioning reference plane, wherein A test guide rail with a slider is installed on the high plane, and a fastening bar is installed on the low plane to make the test guide close to the vertical positioning datum plane on the high plane, and a pressure plate is provided on the slide block; the loading device It includes a force-applying beam fixed on the T-shaped slot platform through the left and right supports and spanning the pressure plate. There are two screw holes on the beam, which are connected to the load cell under the beam through loading bolts and respectively exert force on the pressure plate. Vertical load application point and rolling moment application point; the left support is provided with a screw hole to apply force to the horizontal load application point on the pressure plate through the loading bolt; the deformation detection device includes two sets on the T-shaped slot platform On the dial indicator frame, each dial indicator frame is provided with an electric probe to contact with the deformation measuring point on the pressure plate.

In the above solution, a loading head is provided at the connection between the loading bolt and the load cell, and is positioned by a stopper.

Said fastening bar makes the test guide rail close to the vertical positioning reference plane on the high level plane, which is realized by tightening the test guide rail from the side with the set screw on the fastening bar.

The T-slots of the T-slot platform are grid-shaped T-slots with horizontal and vertical planes perpendicular to each other. When the static stiffness test of multiple guide rails is carried out, the auxiliary mounting plates of the guide rails are correspondingly arranged in multiple pieces, which can be installed at the same time. Multiple test rails.

Compared with the prior art, the present invention has the advantages of:

(1) It can realize the detection of the static stiffness of the rolling linear guide pair under the action of five kinds of loads (including horizontal load F _Y , rotational moment M _Z , rolling moment M _X , vertical load F _Z and overturning moment M _Y );

(2) The positioning and clamping of the guide rail pair conforms to the actual installation conditions, and the loading method is simple and reliable, and easy to operate;

(3) With a slight modification of the experimental device, the static stiffness detection experiment of the double-rail four-slider workbench can be further done.

Description of drawings

Figure 1 is a schematic diagram of the relationship between force and deformation of a rolling linear guide pair.

Fig. 2 is a perspective view of the structure of the present invention.

Fig. 3 is a partial perspective view of the front of the present invention.

Fig. 4 is a layout diagram of force application points and deformation measuring points on the pressure plate in Fig. 2 .

Reference signs in Figure 2 and Figure 3: 1. T-shaped slot platform, 2. Left support, 3. Force beam, 4. Rail sub-mounting plate, 5. Loading bolt, 6. Loading head, 7. Block block, 8. pressure plate, 9. right support, 10. electric sensor head, 11. indicator frame, 12. test guide rail, 13. fastening bar, 14. load cell, 15. set screw.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 2 and Fig. 3, an experimental bench for detecting the static stiffness of a rolling linear guide rail pair includes three parts: a guide rail pair positioning and clamping device, a loading device and a deformation detection device. The guide rail pair positioning and clamping device, the loading device and the deformation detection device are all fixed on the T-slot platform 1 .

Wherein the guide rail pair positioning and clamping device includes a guide rail pair mounting plate 4 , a fastening bar 13 , a test guide rail 12 and a pressing plate 8 . The guide rail sub-mounting plate 4 is fixed longitudinally in the middle of the upper surface of the T-slot platform 1 in the width direction (the front of Fig. 3 ) along the T-shaped slot platform, and the test guide rail 12 and the fastening bar 13 are respectively installed on the upper and lower steps of the guide rail sub-mounting plate position, tighten the test guide rail 12 from the side through the set screw 15 so that it is close to the positioning reference plane on the guide rail sub-mounting plate 4, and the pressure plate 8 is fixed on the slider of the test guide rail 12 to avoid crushing when the test guide rail is directly loaded slider.

The loading device includes a left support 2 , a force beam 3 , a loading bolt 5 , a load cell 14 and a right support 9 . The left support 2 and the right support 9 are symmetrically fixed on both sides of the guide rail sub-mounting plate 4, the force beam 3 spans the pressure plate 8 and is fixed on the upper ends of the left support 2 and the right support 9, and is loaded by the loading bolt 5, The magnitude of the loading force is controlled and measured by a load cell 14 . There are two screw holes on the force beam 3 to apply the vertical load F _Z and the rolling moment M _X respectively, and there is a screw hole on the left support 2 to apply the horizontal load F _Y to move the slider of the test guide rail 12 And the pressure plate 8 can apply the overturning moment M _Y and the rotation moment M _Z .

If the loading bolt 5 directly applies force to the load cell 14, a frictional moment will be generated. Therefore, a loading head 6 with a clearance fit with the loading bolt 5 is made. In order to prevent the loading head 6 from rotating during loading, it is made into a square shape. And constrain with block 7.

The deformation detection device includes two dial indicator frames 11 and two electric sensor heads 10 . The dial indicator frame 11 is attracted on the T-shaped slot platform 1 by magnetic force, and the electric probe 10 is fixed on the dial indicator frame 11, and the deformation measuring point on the pressure plate 8 (corresponding to five loads under the action of Fig. 4 Type b deformation measuring point) contact.

Referring to Fig. 4, the arrow indicates the position of the force application point, and the circle indicates the position of the deformation measuring point. The application point of static stiffness test under the action of vertical load F _Z is arrow a1, and the deformation measurement points are circle b1 and circle b2; the force application point under the action of rolling moment M _X is arrow a2, and the deformation measurement points are circle b1 and circle b2; overturning The force application point under the action of moment M _Y is arrow a3, and the deformation measurement points are circle b2 and circle b3; the force application point under the action of horizontal load F _Y is arrow a4, and the deformation measurement points are circle b4 and circle b5; the rotation moment M _Z acts The force application point below is the arrow a5, and the deformation measuring points are the circle b4 and the circle b5. The magnitude of the moment is equal to the magnitude of the loading force multiplied by the moment arm. The deformation measured by the vertical load F _Z and the horizontal load F _Y is the average value of the measured values of the two inductive probes, and the deformation under the action of the other three moments is the difference between the measured values of the two inductive probes divided by the distance between the measuring points .

The T-slot platform 1 has some T-slots perpendicular to the longitudinal plane, which can facilitate the disassembly of the device. When doing the static stiffness test of the double-rail four-slider workbench, two guide rail sub-mounting plates 4 are required. , install two test rails 12.

The invention provides a device capable of detecting the static stiffness of a rolling linear guide rail pair under five kinds of loads, which conforms to the actual installation conditions of the guide rail, has a simple and reliable loading method, and is convenient for popularization and application.

Claims (1)

1. a kind of experimental bench of detection linear rolling guide Static stiffness, including the guideway positioning being arranged on T-slot platform Clamping device, charger and device for detecting deformation are it is characterised in that described guideway positioning clamping device includes a guideway Installing plate, it is vertically fixed on the horizontal centre of this T-slot platform upper surface along T-slot platform, and this guideway installing plate sets It is equipped with two laterally stepped planes and a vertically oriented datum level, the survey with slide block is installed wherein on high bit-planes Examination guide rail, low level Plane Installation fastening blend stop abuts against on the vertically oriented datum level on high bit-planes by testing guide rail, described Slide block is provided with pressing plate；Described charger includes being fixed on by left and right bearing on T-slot platform and across pressing plate Force crossbeam, this crossbeam is provided with two screws, is connected with the LOAD CELLS below crossbeam by loading bolt and exerts a force respectively The vertical load point of application on pressing plate, the rolling moment point of application；Described left support abutment is provided with a screw and passes through loading bolt Force in the horizontal load point of application on pressing plate；By slide block and the pressing plate of mobile test guide rail, apply tilting moment and rotation Moment；Described device for detecting deformation includes two indicator brackets being arranged on T-slot platform, and each indicator bracket is respectively provided with One inductance probe is contacted with the deformation measuring point on pressing plate；

Described fastening blend stop is by fastening on blend stop by testing guide rail and abutting against on the vertically oriented datum level on high bit-planes Holding screw from side hold out against test guide rail and realize；

The T-slot of described T-slot platform is the laterally and longitudinally vertical latticed T-slot of some planes, when carrying out many guide rails During Static stiffness test, described guideway installing plate relative set is polylith, and installs many test guide rails simultaneously；

Described loading bolt and LOAD CELLS junction are provided with square loading head, are positioned by a block.