Rotation accuracy detector

Abstract

The rotary precision detector comprises a second bearing seat, the second bearing seat is sequentially interference-fitted with a second needle bearing and a second cylindrical thrust bearing from inside to outside, the second needle bearing and the second cylindrical thrust bearing are interference-fitted with a rotary shaft away from one side of the second bearing seat, connecting rod interfaces are arranged on both sides of the middle position of the rotary shaft along the diameter direction, L-shaped connecting rods are connected with the connecting rod interfaces, a dial gauge is connected with the free end of the L-shaped connecting rods, the rotary shaft is sequentially interference-fitted with a first cylindrical thrust bearing and a first needle bearing away from one end of the second cylindrical thrust bearing, the first cylindrical thrust bearing is interference-fitted with a first bearing seat, and a plastic surface is additionally attached to the bottom surface of the second bearing seat. The rotary precision detector can conveniently measure the parallelism error of the annular guide rail and the slide rail plane, ensure that the two planes are consistent in height, and solve the problem of inaccurate rotary precision.

Description

Technical Field

[0001] This invention belongs to the field of metal processing and equipment manufacturing technology, and specifically relates to a rotary accuracy testing instrument. Background Technology

[0002] Various CNC boring and milling machines and horizontal machining centers with B-axis rotary tables enable multi-faceted machining of workpieces with a single setup, offering advantages such as saving on process equipment, shortening production preparation cycles, improving work efficiency, and reducing production costs, resulting in significant economic benefits. However, during daily use, normal wear and tear on the machine tool guideways, inadequate maintenance, and insufficient lubrication can cause an angle between the rotary annular guideway and the slide guideway, leading to a loss of precision on the rotating surface. This results in poor parallelism between the front and back surfaces when machining the workpiece after the front surface has been machined and the B-axis table rotates 180° to machine the back surface. This necessitates a second alignment by the machine operator after machining the front surface, which is time-consuming, labor-intensive, and significantly reduces production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a rotary accuracy testing instrument that solves the problem in the prior art that the rotary annular guide rail and the slide guide rail cannot be parallel during machine tool overhaul.

[0004] The technical solution adopted in this invention is a rotary accuracy testing instrument, including a second bearing housing. From the inside out, the second bearing housing is sequentially fitted with a second needle roller bearing and a second cylindrical thrust bearing. The second needle roller bearing and the second cylindrical thrust bearing are fitted with a rotary shaft on the side away from the second bearing housing. Connecting rod interfaces are provided on both sides along the diameter direction at the middle position of the rotary shaft. The connecting rod interfaces are connected to L-shaped connecting rods. A dial indicator is connected to the free end of the L-shaped connecting rod. On the side of the rotary shaft away from the second cylindrical thrust bearing, there are sequentially fitted first cylindrical thrust bearing and first needle roller bearing. The first cylindrical thrust bearing is fitted with a first bearing housing. The bottom surface of the second bearing housing is also covered with a plastic coating.

[0005] A further feature of this invention is that the diameter of the first needle roller bearing is smaller than that of the first cylindrical thrust bearing, and the diameter of the second needle roller bearing is smaller than that of the second cylindrical thrust bearing. The connecting rod interface is threadedly connected to the L-shaped connecting rod, and a dial indicator is positioned near the second bearing housing. The first bearing housing is equipped with screws and a pair of lifting holes. The screws pass through and fix both the first and second bearing housings. The screws and lifting holes are symmetrically distributed around the axis of the first bearing housing, and the distance from the screws to the axis is less than the distance from the lifting holes to the axis.

[0006] The beneficial effects of the rotary accuracy testing instrument of the present invention are:

[0007] 1. The rotary accuracy tester of the present invention can conveniently measure the parallelism error between the plane of the annular guide rail and the plane of the slide guide rail, ensuring that the two planes are at the same height and solving the problem of inaccurate rotary accuracy;

[0008] 2. The rotary accuracy tester of this invention provides accurate readings with small errors. In the overhaul process of machine tools, it avoids the inconsistency of traditional measurement standards and the accumulation of errors, thus ensuring accuracy. It has a simple structure, is easy to operate, and is safe and reliable. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the rotary accuracy testing instrument of the present invention;

[0010] Figure 2 This is a top view of the rotary accuracy testing instrument of the present invention;

[0011] Figure 3 This is a schematic diagram of the working state structure of the rotary accuracy tester of the present invention;

[0012] Figure 4 This is a schematic diagram illustrating the usage steps of the rotary accuracy tester of the present invention.

[0013] In the diagram, 1. Screw, 2. Lifting hole, 3. First needle roller bearing, 4. First bearing housing, 5. First cylindrical thrust bearing, 6. Rotary shaft, 7. Connecting rod interface, 8. Second cylindrical thrust bearing, 9. Second needle roller bearing, 10. Second bearing housing, 11. Plastic-coated surface, 12. L-shaped connecting rod, 13. Circular guide rail, 14. Slide, 15. Dial indicator, 16. Bed guide rail. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0015] The rotational accuracy testing instrument proposed in this invention, such as... Figure 1 and Figure 2As shown, the bearing includes a second bearing housing 10. From the inside out, the second bearing housing 10 is fitted with a second needle roller bearing 9 and a second cylindrical thrust bearing 8 via an interference fit. The diameter of the second needle roller bearing 9 is smaller than that of the second cylindrical thrust bearing 8. A rotating shaft 6 is interference-fitted on the side of the second needle roller bearing 9 and the second cylindrical thrust bearing 8 away from the second bearing housing 10. Connecting rod interfaces 7 are provided on both sides of the middle position of the rotating shaft 6 along the diameter direction. At the end of the rotating shaft 6 away from the second cylindrical thrust bearing 8, a first cylindrical thrust bearing 5 and a first... The first needle roller bearing 3 has a smaller diameter than the first cylindrical thrust bearing 5. The first cylindrical thrust bearing 5 has an interference fit with the first bearing housing 4. The first bearing housing 4 is provided with screws 1. The screws 1 pass through and fix the first bearing housing 4 and the second bearing housing 10 through threaded connection. The first bearing housing 4 has a pair of lifting holes 2. The screws 1 and the lifting holes 2 are symmetrically distributed around the axis of the first bearing housing 4. The distance from the screws 1 to the axis is less than the distance from the lifting holes 2 to the axis. The bottom surface of the second bearing housing 10 is also covered with a plastic-coated surface 11.

[0016] The reference surfaces of the first needle roller bearing 3, the first cylindrical thrust bearing 5, the second needle roller bearing 9, and the second cylindrical thrust bearing 8 are ground. The connecting rod interface 7 is threadedly connected to an L-shaped connecting rod 12, and a dial indicator 15 is connected to the free end of the L-shaped connecting rod 12. The dial indicator 15 is located on the side near the second bearing housing 10.

[0017] In this invention's rotary accuracy testing instrument, the two reference surfaces at both ends of the rotary shaft, where needle roller bearings and cylindrical thrust bearings are installed, must be ground. The perpendicularity of the two machined surfaces must be guaranteed. Furthermore, the inner holes and steps of the first and second bearing seats must be machined on a lathe in a single operation. The first and second bearing seats are connected by screws, forming a single unit. The plastic-coated bottom surface of the second bearing seat facilitates scraping to prevent the rotary device from failing to meet accuracy requirements during machining, thus fully ensuring the accuracy of the rotary accuracy testing instrument.

[0018] The working process of the rotary accuracy tester of this invention is as follows:

[0019] like Figure 3As shown, the bed guide rail 16 is integrally cast with the bed, ensuring sufficient strength and rigidity of the bed, which is fixed to the ground. Adjust the bed guide rail 16 to be absolutely level with the ground in both the horizontal and vertical directions. The slide 14 moves horizontally left and right along the bed guide rail 16. The plastic-coated surface 11 at the bottom of the rotary accuracy tester of this invention is completely in contact with the reference surface on which the rotary slide 14 is installed. This invention is placed on the base surface of the rotary slide 14. The first step is to ensure the correct reference and its consistency. This reference can detect the equal height of the rotary slide 14 and the bed guide rail 16, and also the parallelism between the rotation center and the annular guide rail 13. First, connect the L-shaped connecting rod 12 to the connecting rod interface 7 of this device. The L-shaped connecting rod 12 and the connecting rod interface 7 are connected by threads and locked with a nut to ensure a firm and reliable connection. The joint of the L-shaped connecting rod 12 is vertically downward.

[0020] like Figure 4 As shown, begin by slowly rotating the rotary shaft 6 of the rotary accuracy testing instrument horizontally. When the L-shaped connecting rod 12 is rotated to position a directly above the bed guide rail 16, place the dial indicator 15 directly below the joint of the L-shaped connecting rod 12, press the indicator down by 0.15mm-0.2mm, and set the dial indicator pointer to zero. Next, rotate the rotary shaft 6 to position b on the bed guide rail 16, and move the dial indicator 15 to press down on the joint of the L-shaped connecting rod 12. Read and record the data from the dial indicator 15. Repeat this process to read and record the data from positions c and d on the bed guide rail 16. Then rotate the rotary shaft 6 back to position a and press down the dial indicator, checking if the dial indicator 15 pointer is at zero. If the dial indicator 15 pointer is at zero, the reading is accurate. If the dial indicator 15 pointer deviates from the zero position, the same method as above is required for measurement. The measurement data is considered accurate and reliable if the dial indicator readings at the starting and ending positions are the same. Then, the sliding surface of the bed guide rail 16 of the rotary slide 14 is scraped. The rotary slide 14 and bed guide rail 16 are considered to be at the same height if the dial indicator 15 reads the same value at point d on the bed guide rail 16. The method for detecting the rotation center and the rotary annular guide rail is the same as described above.

[0021] Example 1

[0022] The rotary accuracy testing instrument of the present invention, such as Figure 1As shown, the bearing includes a second bearing housing 10. From the inside out, the second bearing housing 10 is sequentially fitted with a second needle roller bearing 9 and a second cylindrical thrust bearing 8. The second needle roller bearing 9 and the second cylindrical thrust bearing 8 are fitted with a rotary shaft 6 on the side away from the second bearing housing 10. The rotary shaft 6 has connecting rod interfaces 7 on both sides along the diameter direction at the middle position. The connecting rod interfaces 7 are connected to L-shaped connecting rods 12. The free end of the L-shaped connecting rods 12 is connected to a dial indicator 15. The rotary shaft 6 is sequentially fitted with a first cylindrical thrust bearing 5 and a first needle roller bearing 3 on the side away from the second cylindrical thrust bearing 8. The first cylindrical thrust bearing 5 is fitted with a first bearing housing 4. The bottom surface of the second bearing housing 10 is also covered with a plastic-coated surface 11.

[0023] Example 2

[0024] The rotary accuracy testing instrument of the present invention, such as Figure 1 As shown, the bearing includes a second bearing housing 10. From the inside out, the second bearing housing 10 is fitted with a second needle roller bearing 9 and a second cylindrical thrust bearing 8 via interference fit. A rotating shaft 6 is interference-fitted on the side of the second needle roller bearing 9 and the second cylindrical thrust bearing 8 away from the second bearing housing 10. Connecting rod interfaces 7 are provided on both sides of the rotating shaft 6 along the diameter direction at the middle position. L-shaped connecting rods 12 are connected to the connecting rod interfaces 7. A dial indicator 15 is connected to the free end of the L-shaped connecting rod 12. On the side of the rotating shaft 6 away from the second cylindrical thrust bearing 8, a first cylindrical thrust bearing 5 and a first needle roller bearing 3 are sequentially fitted via interference fit. The first cylindrical thrust bearing 5 is fitted with a first bearing housing 4 via interference fit. A plastic-coated surface 11 is also attached to the bottom surface of the second bearing housing 10. The diameter of the first needle roller bearing 3 is smaller than that of the first cylindrical thrust bearing 5, and the diameter of the second needle roller bearing 9 is smaller than that of the second cylindrical thrust bearing 8. The connecting rod interfaces 7 and the L-shaped connecting rods 12 are threaded together. The dial indicator 15 is located near the second bearing housing 10. The first bearing housing 4 is provided with screws 1 and a pair of lifting holes 2 are provided on the first bearing housing 4.

[0025] Example 3

[0026] The rotary accuracy testing instrument of the present invention, such as Figure 1As shown, the bearing includes a second bearing housing 10. From the inside out, the second bearing housing 10 is fitted with a second needle roller bearing 9 and a second cylindrical thrust bearing 8 via interference fit. A rotating shaft 6 is interference-fitted on the side of the second needle roller bearing 9 and the second cylindrical thrust bearing 8 away from the second bearing housing 10. Connecting rod interfaces 7 are provided on both sides of the rotating shaft 6 along the diameter direction at the middle position. L-shaped connecting rods 12 are connected to the connecting rod interfaces 7. A dial indicator 15 is connected to the free end of the L-shaped connecting rod 12. On the side of the rotating shaft 6 away from the second cylindrical thrust bearing 8, a first cylindrical thrust bearing 5 and a first needle roller bearing 3 are sequentially fitted via interference fit. The first cylindrical thrust bearing 5 is fitted with a first bearing housing 4 via interference fit. A plastic-coated surface 11 is also attached to the bottom surface of the second bearing housing 10. The diameter of the first needle roller bearing 3 is smaller than that of the first cylindrical thrust bearing 5, and the diameter of the second needle roller bearing 9 is smaller than that of the second cylindrical thrust bearing 8. The connecting rod interfaces 7 and the L-shaped connecting rods 12 are threaded together. The dial indicator 15 is located near the second bearing housing 10. The first bearing housing 4 is provided with screws 1 and a pair of lifting holes 2. Screws 1 pass through and fix the first bearing housing 4 and the second bearing housing 10. Screws 1 and lifting holes 2 are symmetrically distributed around the axis of the first bearing housing 4, and the distance from screw 1 to the axis is less than the distance from lifting hole 2 to the axis.

Claims

1. A rotational accuracy testing instrument, characterized in that, The bearing includes a second bearing housing (10), which is fitted with a second needle roller bearing (9) and a second cylindrical thrust bearing (8) in sequence from the inside to the outside. A rotating shaft (6) is fitted with the second needle roller bearing (9) and the second cylindrical thrust bearing (8) on the side away from the second bearing housing (10). Connecting rod interfaces (7) are provided on both sides of the rotating shaft (6) along the diameter direction at the middle position. An L-shaped connecting rod (12) is connected to the connecting rod interface (7). A dial indicator (15) is connected to the free end of the L-shaped connecting rod (12). The rotating shaft (6) is located away from the second bearing housing (10). One end of the second cylindrical thrust bearing (8) is successively fitted with an interference fit first cylindrical thrust bearing (5) and a first needle roller bearing (3). The first cylindrical thrust bearing (5) is fitted with an interference fit first bearing seat (4). The bottom surface of the second bearing seat (10) is also covered with a plastic-coated surface (11). The plastic-coated surface (11) is completely in contact with the reference surface of the mounting slide (14). The slide (14) moves left and right along the horizontal direction of the bed guide rail (16). Start rotating the rotary shaft (6) in the horizontal direction. When the L-shaped connecting rod (12) rotates to a position directly above the bed guide rail (16), the dial indicator (15) is adjusted. Place the dial indicator (15) directly below the connector of the L-shaped connecting rod (12), press it to 0.15mm-0.2mm, and set the dial indicator pointer to zero. Then rotate the rotating shaft (6) of this device to point b on the bed guide rail (16), and move the dial indicator (15) to press against the connector of the L-shaped connecting rod (12). Read the data from the dial indicator (15) and record the data. Repeat this process to read the data at points c and d on the bed guide rail (16) of the L-shaped connecting rod (12) and record them. Then rotate the rotating shaft (6) to point a and press the dial indicator on. Check if the dial indicator (15) pointer is at zero. If the dial indicator (15) needle is at the zero position, it indicates that the reading is accurate. If the dial indicator (15) needle is off-center and not at the zero position, it is necessary to use the same method to measure until the dial indicator readings at the starting and ending positions are the same, which indicates that the measured data is accurate and reliable. Then, the sliding surface of the bed guide rail (16) of the rotary slide (14) is scraped until the data at point d on the bed guide rail (16) is the same as that of the rotary slide (14) and the bed guide rail (16) detected by the dial indicator (15), which indicates that the rotary slide (14) and the bed guide rail (16) are at the same height.

2. The rotational accuracy testing instrument according to claim 1, characterized in that, The diameter of the first needle roller bearing (3) is smaller than that of the first cylindrical thrust bearing (5), and the diameter of the second needle roller bearing (9) is smaller than that of the second cylindrical thrust bearing (8).

3. The rotational accuracy testing instrument according to claim 1, characterized in that, The connecting rod interface (7) is threadedly connected to the L-shaped connecting rod (12), and the dial indicator (15) is located on the side near the second bearing seat (10).

4. The rotational accuracy testing instrument according to claim 1 or 3, characterized in that, The first bearing housing (4) is provided with screws (1) and a pair of lifting holes (2) are provided on the first bearing housing (4).

5. The rotational accuracy testing instrument according to claim 4, characterized in that, The screw (1) passes through and fixes the first bearing seat (4) and the second bearing seat (10).

6. The rotational accuracy testing instrument according to claim 5, characterized in that, The screw (1) and the lifting hole (2) are symmetrically distributed around the axis of the first bearing seat (4), and the distance from the screw (1) to the axis is less than the distance from the lifting hole (2) to the axis.

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