CN201872026U - Double-grinding-head thermal extension noncontact measuring mechanism of guide rail shaping grinding machine - Google Patents

Abstract

The utility model discloses a non-contact measuring mechanism for thermal elongation of double grinding heads of a guide rail forming grinder. Including X-direction carriage, Z-direction carriage and non-contact laser displacement sensor; after the X-direction carriage and Z-direction carriage cooperate, the two X-direction carriage guide rail grooves on the X-direction carriage and the two grinding heads X Cooperate with the guide rail in the direction, the carriage nut seat on the carriage in the X direction cooperates with the X-direction screw of the measuring mechanism installed between the double grinding heads of the guide rail forming grinder, so that the entire thermal elongation non-contact measuring mechanism is installed on the guide rail forming grinder double grinding machine Between the heads, the non-contact laser displacement sensor is located on the upper surface of the grinding wheel after installation. The utility model can effectively realize the non-contact measurement of the thermal elongation of the double grinding heads through the added additional structure without affecting the main structure of the grinding machine gantry frame and the grinding head. The utility model has good mechanism stability, easy operation and high measurement accuracy. It effectively improves the symmetry and precision of the two sides in the profile grinding of the guide rail, and improves the performance of the guide rail.

Description

A Non-contact Measuring Mechanism for Thermal Elongation of Dual Grinding Heads of Guide Rail Forming Grinder

technical field

The utility model relates to a forming grinding processing technology, in particular to a non-contact measuring mechanism for thermal elongation of double grinding heads of a guide rail forming grinder.

Background technique

The precision curved linear rolling guideway is the key component of the current precision CNC machining equipment, which has an important impact on the overall accuracy of the machine tool and the stability of the machining process. The finishing process of precision curved guide rails is generally completed on guide rail forming grinders. The grinding of the forming surface of the guide rail involves multiple surfaces, and the machining of the two sides of the guide rail generally uses two vertical grinding heads with a forming grinding wheel for symmetrical grinding.

At the beginning of the grinding process, the left and right grinding heads are at the same height to ensure the symmetry of the side shape of the guide rail. During the processing, due to the heating of the spindle and the grinding wheel, the two grinding heads elongate, and due to the differences in the structure, material, installation and other links, the thermal elongation of the two grinding heads is often inconsistent. The consequence of this phenomenon is that there is a difference in height between the side forming surfaces of the two guide rails, which will cause the slider installed on the guide rails to tilt, seriously affecting the machining accuracy and durability of the guide rails.

To solve this problem, the traditional method is to conduct a sampling inspection on the product after a certain period of grinding. If the heights of the two grinding heads are found to be inconsistent, manually compensate and adjust the Z-axis height through the numerical control system. Such a method not only has disadvantages such as poor measurement accuracy and low stability, but also has low measurement and processing efficiency, and may produce substandard products, resulting in waste.

The ideal method is to be able to obtain the thermal elongation data of the left and right grinding heads online during processing, and through comparison, transmit the elongation to the CNC system through a special interface, and the CNC system will automatically perform compensation control. The primary problems to be solved by using this method include: 1. Design a reasonable measurement method. On the one hand, since the thermal elongation is finally reflected in the level of the grinding wheel, and the grinding wheel is in continuous operation during the grinding process, it is difficult to apply the traditional contact measurement method effectively; on the other hand, the impurities in the grinding process And coolant will greatly affect the accuracy of contact measurement, while causing damage to the sensing equipment. 2. Design a reasonable measuring mechanism. An ideal measuring mechanism can minimize the impact on the original machine tool structure, and realize on-line measurement without changing the original structure and operation mode as much as possible. Moreover, in order to meet the needs of measuring the left and right grinding heads, it is necessary to consider the flexible movement and configuration capabilities of the device.

Contents of the invention

In order to reduce the difference in the thermal elongation of the double grinding heads and improve the shape and position accuracy of the guide rail forming surface, the purpose of the utility model is to provide a non-contact measurement mechanism for the thermal elongation of the double grinding heads of the guide rail forming grinder, so as to realize the thermal elongation of the double grinding heads. Accurate on-line measurement of elongation, and at the same time feedback the measurement information to the CNC system for effective error compensation.

The technical solution adopted by the utility model to solve its technical problems is as follows:

Thermal elongation non-contact measurement mechanism It includes X-direction carriage, Z-direction carriage and non-contact laser displacement sensor; where:

1) One side of the X-direction carriage is provided with symmetrically arranged X-direction carriage guide rail grooves on the upper and lower sides, and the X-direction carriage nut seat is arranged under the X-direction carriage near the X-direction carriage guide rail groove, and the other side of the X-direction carriage On the left side of one side, there is a Z-direction single guide rail, and on the right side, there is a Z-direction screw;

2) On one side of the Z-direction carriage, there is a Z-direction carriage nut seat on the left side, and a Z-direction carriage guide rail groove on the right; the Z-direction carriage guide rail groove cooperates with the single guide rail of the X-direction carriage, and the Z-direction carriage The nut seat cooperates with the Z-direction lead screw of the X-direction carriage; the lower end of the Z-direction carriage is provided with a sensor mounting seat, and a non-contact laser displacement sensor is installed on the mounting seat, which is fixed by screws;

The two X-direction carriage guide rail grooves on the X-direction carriage cooperate with the two grinding head X-direction guide rails, the carriage nut seat on the X-direction carriage and the measuring mechanism set between the double grinding heads of the guide rail forming grinder in the X direction The lead screw cooperates, so that the entire thermal elongation non-contact measuring mechanism is installed between the double grinding heads of the rail forming grinder, and the non-contact laser displacement sensor is located on the upper surface of the grinding wheel after installation.

When measuring, collect multiple points once at the measurement position of the left grinding head to obtain the average value, reduce the measurement error, and obtain the height value, and then drive the X-direction carriage through the X-direction screw to reach the measurement position of the right grinding head and grinding wheel, and Get measurements. Compare the current measurement value with the previous measurement, and feed back the thermal elongation difference information to the numerical control system for automatic compensation.

The beneficial effect that the utility model has is:

The utility model adopts a non-contact measuring method with a movable structure. It enriches the idea of error measurement and monitoring in the current form grinding process, and at the same time, it is designed for the double grinding head device, which has good adaptability and effectively solves the problem of online measurement of the thermal elongation of the left and right grinding heads in the forming surface grinding process .

Due to the non-contact measurement method with a movable structure, on the one hand, it avoids the direct contact between the measuring equipment and the rotating grinding wheel, which improves the safety and measurement accuracy of the equipment; The thermal elongation measurement of the grinding head is efficient and economical without changing the main structure of the original grinding machine.

On the premise of not affecting the main structure of the grinding machine gantry and grinding head, the utility model can effectively realize the non-contact measurement of the thermal elongation of the double grinding head through the added additional structure, the mechanism is stable, the operation is simple, and the measurement accuracy is high. It effectively improves the symmetry and precision of the two sides in the profile grinding of the guide rail, and improves the performance of the guide rail.

Description of drawings

Fig. 1 is a schematic diagram of the installation state of the measuring mechanism of the present invention.

Figure 2 is a schematic diagram of the overall structure of the measuring mechanism.

Fig. 3 is a left view of the structure of the carriage in the X direction of the measuring mechanism.

Fig. 4 is a right side view of Fig. 3 .

Fig. 5 is a view along the direction A of Fig. 3 .

Fig. 6 is a front view of the carriage and mounting seat mechanism in the Z direction of the measuring mechanism.

Fig. 7 is a left view of the carriage structure in the Z direction of the measuring mechanism.

Fig. 8 is a view taken along direction B of Fig. 7 .

Fig. 9 is a schematic diagram of non-contact measurement by a laser displacement sensor.

Fig. 10 is a schematic diagram of the working process of the measuring mechanism and the thermal elongation compensation control flow of the utility model.

In the figure: 1- guide rail in X direction of grinding head, 2- lead screw in X direction of mechanism, 3- spindle of grinding head, 4- grinding wheel, 5- worktable, 6- workpiece, 7- gantry frame, 8- grinding head carriage, 9-Z direction carriage, 10-X direction carriage, 11-X direction carriage guide rail groove, 12-X direction carriage nut seat, 13-Z direction single guide rail, 14-Z direction screw, 15-Z direction Carrier nut seat, 16-sensor mounting seat, 17-screw, 18-non-contact laser displacement sensor, 19-Z direction carriage guide rail groove.

Detailed ways

Below in conjunction with accompanying drawing and implementation process, the utility model is further described.

As shown in Figures 1 to 8, the thermal elongation non-contact measurement mechanism includes an X-direction carriage 10, a Z-direction carriage 9 and a non-contact laser displacement sensor 18; wherein:

1) One side of the X-direction carriage 10 is provided with symmetrically arranged X-direction carriage guide rail grooves 11 on the upper and lower sides, and an X-direction carriage nut seat 12 is provided under the X-direction carriage 10 close to the X-direction carriage guide rail groove. The left side of the other side of the carriage 10 is provided with a Z-direction single guide rail 13, and the right side is provided with a Z-direction screw 14;

2) One side of the Z-direction carriage 9 is provided with a Z-direction carriage nut seat 15 on the left side, and the right side is provided with a Z-direction carriage guide rail groove 19; the Z-direction carriage 9 guide rail groove 19 is connected with the single guide rail of the X-direction carriage 10 13, the Z-direction carriage nut seat 15 cooperates with the Z-direction screw 14 of the X-direction carriage 10; the lower end of the Z-direction carriage 9 is provided with a sensor mounting seat 16, and a non-contact laser displacement sensor 18 is installed on the mounting seat. It is fixed by screws 17; the power for the rotation of the screw 2 in the X direction is generated by the servo motor in the X direction; the power for the rotation of the screw 14 in the Z direction is generated by the servo motor in the Z direction.

The two X-direction carriage guide rail grooves 11 on the X-direction carriage 10 cooperate with the two grinding head X-direction guide rails 1, and the carriage nut seat 12 on the X-direction carriage 10 is arranged between the double grinding heads of the guide rail forming grinder. The X-direction lead screw 2 of the measuring mechanism cooperates, so that the entire thermal elongation non-contact measuring mechanism is installed between the double grinding heads of the guide rail forming grinder, and the non-contact laser displacement sensor 18 is located on the upper surface of the grinding head spindle 3 and grinding wheel 4 after installation.

During processing, the workpiece 6 is clamped on the worktable 5, and the grinding head spindle 3 on the gantry 7 drives the grinding wheel 4 to perform precise grinding on the side of the workpiece 6. This measuring device realizes the thermal elongation of the two grinding head spindles 3 during processing. detection function. The entire measuring mechanism can be positioned at the measurement position on the upper surface of the grinding wheel of the left and right grinding heads in the X direction, so that the laser point is located on the upper surface of the grinding wheel, and the non-contact measurement height in the range of 200-300mm can be positioned in the Z direction. When measuring, collect multiple points once at the measurement position of the left grinding head to obtain the average value, reduce the measurement error, and obtain the height value, and then drive the X-direction carriage 10 through the X-direction screw 2 to reach the measurement position of the right grinding head and grinding wheel , and get the measured value. Compare the current measurement value with the previous measurement, and feed back the thermal elongation difference information to the numerical control system for automatic compensation.

When the laser displacement sensor is used for non-contact measurement, the emitted light produces diffuse reflection on the surface of the measured workpiece, and according to the position change of the reflected light in the CCD imaging, the sensor uses the principle of triangulation to calculate the displacement of the measured grinding wheel, thereby achieving high precision Measurement. The non-contact measurement principle of the laser displacement sensor is shown in Figure 9.

The working process of the present utility model is as follows:

1. Adjust the left and right grinding wheels to the same height during tool setting, turn on the grinding head spindle, and start processing;

2. Obtain the X-axis position information of the left and right grinding heads, and control the X-direction of the measuring mechanism to locate on the upper surface of the grinding wheel, so as to measure the left grinding head;

3. Start the non-contact laser displacement sensor, hit the light spot on the upper surface of the grinding wheel, and adjust the measuring mechanism according to the measured value, so that it is positioned at the best measuring height of 200-300mm in the Z direction;

4. Dynamically and continuously collect batch data, output after homogenization, and feed back to the system as the height measurement result;

5. Repeat steps 2 to 4 to measure the right grinding wheel;

6. By comparing the measurement data of the left and right grinding wheels with the previous measurement data, the thermal elongation of the grinding head is obtained, and the thermal elongation is fed back to the machine tool through the interface of the numerical control system for compensation.

The working process of laser non-contact thermal elongation measurement is shown in Figure 10.

Claims (1)

1. two bistrique thermal stretching non-cpntact measurement mechanisms of a guide rail form grinder, it is characterized in that: it comprises directions X planker (10), Z direction planker (9) and non-contact laser displacement transducer (18) thermal stretching non-cpntact measurement mechanism; Wherein:

1) directions X planker (10) one sides are respectively equipped with the directions X carriage rail groove of symmetric arrangement up and down, directions X planker (10) below near directions X pallet guide groove is provided with directions X plate nut seat (12), the left side of the another side of directions X planker (10) is provided with Z direction single-rail (13), and the right is provided with Z direction leading screw (14);

2) left side, Z direction planker (9) one side is provided with Z direction carriage nut seat (15), and the right is provided with Z direction carriage rail groove (19); Z direction planker (9) guide-track groove (19) cooperates with the single-rail (13) of described directions X planker (10), and Z direction carriage nut seat (15) cooperates with the Z direction leading screw (14) of described directions X planker (10); Z direction planker (9) lower end is provided with sensor mount pad (16), and non-contact laser displacement transducer (18) is installed on the mount pad, and is fixing by screw (17);

Two directions X carriage rail grooves (11) on the directions X planker (10) cooperate with two bistrique directions X guide rails (1), carriage nut seat (12) on the directions X planker (10) cooperates with the measuring mechanism directions X leading screw (2) that is arranged between the two bistriques of guide rail form grinder, whole thermal stretching non-cpntact measurement mechanism is installed between the two bistriques of guide rail form grinder, the upper surface that back non-contact laser displacement transducer (18) is positioned at emery wheel (4) is installed.

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