CN115302288B - Device and method for milling precision correction based on three-point positioning - Google Patents

Abstract

The present application discloses a device and method for correcting milling accuracy based on three-point positioning, including a support table, a guide rail set, a support plate for supporting the side or bottom of a part, and an adjuster for adjusting the height of the support plate; the support table A guide rail group is arranged on the upper surface of the guide rail group, and the guide rail group includes at least three guide rails, and the guide rails are parallel to each other; the guide rails are provided with sliders that cooperate with the guide rails, and the sliders are provided with lifting devices, and the lifting devices are provided with contact parts. a contact sensor at the bottom; several adjusters are arranged on both sides of the guide rail group; a support plate is arranged on the adjuster, and the support plate is located above the contact sensor. A device and method for correcting milling accuracy based on three-point positioning of the present application solves the technical problem of large machining errors of parts through the use of contact sensors and regulators, realizes relatively stable milling postures of parts, and reduces stress on parts. The error caused by processing meets the processing requirements of the parts.

Description

A device and method for milling accuracy correction based on three-point positioning

technical field

The present application relates to the field of precision milling technology, in particular to a device and method for correcting milling precision based on three-point positioning.

Background technique

With the progress of the times, the milling accuracy requirements for current processing are gradually increasing. The usual processing technology is to fix the part on the milling equipment as a reference, then determine the coordinate system, and perform milling according to the coordinate value. The milling division includes at least rough milling. And fine milling, the processing object is processed by a deep milling feed method during the rough milling process, which makes the processing efficiency higher. Milling, slow feed milling, so that the accuracy is improved.

For some processed parts, the processing is carried out on the basis of the original product. Whether the product is qualified needs to be installed on the relative structure for testing. The processing of this kind of parts requires repeated processing, assembly, testing, and reprocessing; because Various deviations are likely to exist in the attitude change of the parts during the repeated correction process, resulting in large machining errors of the parts, which cannot meet the processing requirements.

The above content is only used to assist in understanding the technical solution of the present application, and does not mean that the above content is admitted as prior art.

Contents of the invention

The main purpose of this application is to provide a device and method for correcting milling accuracy based on three-point positioning, aiming at solving the technical problem of large machining errors of parts.

To achieve the above purpose, the present application provides a device for correcting milling accuracy based on three-point positioning, including a support table, a guide rail set, a support plate for supporting the side or bottom of a part, and an adjuster for adjusting the height of the support plate;

The guide rail group is provided on the upper surface of the support platform, the guide rail group includes at least three guide rails, and the guide rails are parallel to each other;

The guide rail is provided with a slider that cooperates with the guide rail, the slider is provided with a lifting device, and the lifting device is provided with a contact sensor for contacting the bottom of the part;

Both sides of the guide rail group are provided with several regulators;

The support plate is arranged on the adjuster, and the support plate is located above the contact sensor.

Optionally, the adjuster includes a lifting rod and a driving device;

The driving device drives the lifting rod up and down;

The supporting plate is arranged on the top of the lifting rod.

Optionally, a mounting cylinder is also included, and the driving device includes a driving motor, a driving gear and rack teeth;

The lifting rod is arranged in the installation cylinder, and the driving motor and the driving gear are fixed on the installation cylinder;

The drive motor drives the drive gear to rotate;

The drive gear is in drive connection with the bar teeth;

The bar-shaped teeth are arranged in the length direction of the lifting rod.

Optionally, a guide block is also included, the guide block is arranged on the top of the lifting rod,

The guide block is provided with a guide groove, and the support plate is fitted in the guide groove;

At least one magnetic block is provided on the inner wall of the guide groove, and a magnetic bar corresponding to the magnetic block is provided on the support plate.

Optionally, two magnetic blocks are provided on the inner wall of the guide groove.

Optionally, a contact switch is arranged on the support plate, and the contact switch is used to trigger a contact signal by contacting a part.

Optionally, the guide rail includes a limiting portion and an extension portion, and the lifting device includes a stroke cylinder;

The extension part is arranged above the limiting part and communicates with each other;

The slider is slidably connected in the limiting part;

The stroke cylinder is arranged on the upper end of the slider and is located in the extension part;

The contact sensor is arranged at the piston end of the stroke cylinder.

Optionally, a pushing device for pushing the slider to move on the guide rail is also included.

In addition, in order to achieve the above purpose, the present application also provides a method for correcting milling accuracy based on three-point positioning, using a device for correcting milling accuracy based on three-point positioning, including the following steps:

supporting a part by the support plate, and bringing the bottom of the part into contact with the contact sensor;

Obtaining the bottom parameters of the part by using the contact sensor;

The attitude of the part is adjusted through the regulator according to the bottom parameter, so that the bottom parameter of the part reaches a set value.

Optionally, the adjustment of the attitude of the part by the regulator according to the bottom parameter, so that the bottom parameter of the part reaches a set value, includes:

Step a: After obtaining the bottom parameter of the part, detach the contact sensor from the part;

Step b: adjusting the posture of the part according to the bottom parameter through the regulator;

Step c: touching the contact sensor to the bottom of the part again to obtain the bottom parameter of the part;

Step d: Repeat steps a to c until the bottom parameter of the part reaches the set value.

The beneficial effect that this application can realize:

When using a device for correcting milling accuracy based on three-point positioning of the present application, first place the part to be positioned on the support plate, position the part through the support plate, and then adjust the slider so that the contact sensor is located below the part, Start the lifting device so that the contact sensor on the lifting device touches the bottom of the part. Since there are at least three or more guide rails, after touching the part through the contact sensor, the inclination information of the bottom of the part is obtained by using the principle of three points forming a surface. When all When the contact sensor touches the bottom of the part at the same time, the bottom of the surface part is parallel. When there is a time difference and touches the bottom plate of the part, the bottom of the surface part has an inclination. The inclination angle of the bottom of the part is calculated by the contact time difference of the contact sensor and the distance between the contact sensors. , according to the inclination angle of the bottom of the part, by adjusting each adjuster in different positions, adjust the up and down height of the support plate, thereby adjusting the inclination angle of the bottom of the part, so that the inclination of the bottom of the part reaches the specified parameter, and finally the bottom of the part can be detected by the contact sensor again Whether the inclination angle is qualified, if it is not qualified, repeat the adjustment and inspection until it is qualified, and then clamp the part through the tooling to ensure that the part is in the specified position, so that the milling posture is relatively stable, and the damage caused to the processing of the part is reduced The error meets the processing requirements of the parts. The technical problem of large machining error of parts is solved.

A device and method for correcting milling accuracy based on three-point positioning proposed in the embodiment of the present application solves the technical problem of large machining errors of parts through the use of contact sensors and regulators, and realizes relatively stable milling postures of parts, reducing The error caused by the processing of the parts is small, which meets the processing requirements of the parts.

Description of drawings

FIG. 1 is a schematic structural diagram of a device for correcting milling accuracy based on three-point positioning provided by an embodiment of the present application;

Fig. 2 is the structural representation of the regulator provided by the embodiment of the present application;

Figure 3 is a schematic diagram of the installation of the contact plate provided by the embodiment of the present application;

Fig. 4 is a schematic structural view of the guide groove and the contact plate provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of the position of the contact sensor provided by the embodiment of the present application;

1-support table, 2-regulator, 3-support plate, 4-guide rail, 5-slider, 6-stroke cylinder, 7-contact sensor, 101-installation plate, 102-extrusion device, 201-installation cylinder, 202 -Lifting rod, 203-Drive wheel, 204-Rack teeth, 205-Guide block, 206-Guide groove, 207-Magnetic block, 301-Magnetic bar, 302-Contact switch, 401-Limiting part, 402- extension.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the figure). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B" as an example, including scheme A, scheme B, or schemes that both A and B satisfy. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

For the processing of general-shaped parts, CNC special machines are usually used. The robot arm can be used to detect the position and orientation of the processing object in space in real time, and the processing program is corrected through secondary programming, so as to improve the error during processing. impact on precision.

However, for some special processing parts, the processing is carried out on the basis of the original product. Whether the product is qualified or not needs to be installed on the relative structure for testing. The processing of this kind of parts requires repeated processing, assembly, testing, and reprocessing. ;One-time processing and forming of direct CNC special machine requires multiple programming and proofreading, which makes the application cost high and the processing efficiency is extremely low. For the processing of this kind of parts, more consideration is to use semi-automatic equipment to cooperate with tooling for partial correction and milling of parts, then pre-assembly, and finally precision grinding. Considering that the posture changes of the parts during the correction process are prone to various deviations, and these deviations are caused by multiple dimensions such as mechanical factors and human factors. When the bottom surface of a single part has an inclination angle, the secondary processing and installation process requires cumbersome proofreading. Therefore, how to improve the workload in the secondary installation process and shorten the accuracy verification is worth studying.

Referring to Fig. 1-Fig. 5, a device and method for correcting milling accuracy based on three-point positioning in the present application. The first embodiment provides a device for correcting milling accuracy based on three-point positioning, including a support table 1, a guide rail group, and a support platform for supporting The support plate 3 on the side or bottom surface of the part and the regulator 2 for adjusting the height of the support plate; the upper surface of the support table 1 is provided with the guide rail group, and the guide rail group includes at least three guide rails 4, and each guide rail 4 are parallel to each other; the guide rail 4 is provided with a slider 5 that cooperates with the guide rail 4, and the slider 5 is provided with a lifting device, and the lifting device is provided with a contact for contacting the bottom of the part. Sensor 7; several adjusters 2 are arranged on both sides of the guide rail group; the support plate 3 is arranged on the adjuster 2, and the support plate 3 is located above the contact sensor 7.

A device for correcting milling accuracy based on three-point positioning in the present application is provided with an adjuster 2 on both sides of the support table 1, and a support plate 3 is provided on the adjuster 2, and the support plate 3 is used to support the parts to be positioned. The adjuster 2 is used to adjust the height of the support plate 3. The guide rail set is arranged on the upper surface of the support table 1, and the adjuster 2 is located on both sides of the guide rail set in the length direction, so that the adjuster 2 adjusts the posture of the parts. The guide rail set includes at least three More than one guide rail 4, and the guide rails 4 are parallel to each other, the guide rail 4 is provided with a slide block 5 that cooperates with the guide rail 4, the slide block 5 is provided with a lifting device, and the lift device is provided with a Touch the contact sensor 7 on the bottom of the part. When using a device for correcting milling accuracy based on three-point positioning of the present application, first place the part to be positioned on the support plate 3, position the part through the support plate 3, and then adjust the slider 5 so that the contact sensor 7 is located at Below the part, start the lifting device so that the contact sensor 7 on the lifting device touches the bottom of the part. Since there are at least three or more guide rails 4, after touching the part through the contact sensor 7, the bottom of the part is obtained by using the principle of three points forming a surface. The inclination information, when all the contact sensors 7 touch the bottom of the part at the same time, the bottom of the surface part is parallel, when there is a time difference against the bottom plate of the part, the bottom of the surface part has an inclination, through the contact time difference of the contact sensor 7 and the contact sensor 7 The distance between them calculates the inclination angle of the bottom of the part. According to the inclination angle of the bottom of the part, by adjusting each adjuster 2 in different positions, the up and down height of the support plate 3 is adjusted, thereby adjusting the inclination angle of the bottom of the part, so that the inclination of the bottom of the part reaches Specify the parameters, and finally use the contact sensor 7 to detect whether the inclination angle of the bottom of the part is qualified. If it is not qualified, repeat the adjustment and inspection until it is qualified. After passing, the part is clamped by the tooling to ensure that the part is in the specified position. The milling attitude is relatively stable, the error caused by the processing of the parts is reduced, and the processing requirements of the parts are met. The technical problem of large machining error of parts is solved.

The function of the adjuster 2 is to adjust the up and down height of the support plate 3, thereby changing the posture of the parts. The adjuster 2 can be a telescopic device, a crank device, etc. In this embodiment, as shown in Figure 2, the adjuster 2 includes Lifting rod 202 and driving device;

The driving device drives the elevating rod 202 to ascend and descend;

The support plate 3 is arranged on the top of the lifting rod 202 . In this embodiment, the lifting rod 202 is driven up and down by the driving device, so as to realize the lifting of the support plate 3 , the structure is simple, the efficiency is high, and the support plate 3 can be quickly raised and lowered.

In this embodiment, a mounting cylinder 201 is also included, and the driving device includes a driving motor, a driving gear and a rack tooth 204;

The lifting rod 202 is arranged in the installation cylinder 201, and the driving motor and the driving gear are fixed on the installation cylinder 201;

The drive motor drives the drive gear to rotate;

The drive gear is in transmission connection with the bar teeth 204;

The rack teeth 204 are arranged along the length direction of the lifting rod 202 . In this embodiment, the drive gear is driven to rotate by the drive motor, and the drive gear drives the bar teeth 204 to move up and down, thereby driving the lifting rod 202 to move up and down. Since the lifting rod 202 is provided with a support plate 3, thereby Drive the support plate 3 to move up and down, by adjusting the up and down heights of different support plates 3, since the part is supported by several support plates 3, the attitude of the part can be adjusted;

As shown in FIG. 3 and FIG. 4 , a guide block 205 is also included, and the guide block 205 is arranged on the top of the lifting rod 202 ,

The guide block 205 is provided with a guide groove 206, and the support plate 3 is fitly installed in the guide groove 206;

At least one magnetic block 207 is disposed on the inner wall of the guide groove 206 , and a magnetic strip 301 corresponding to the magnetic block 207 is disposed on the support plate 3 . In this embodiment, a guide block 205 is provided on the top of the lifting rod 202, and a guide slot 206 is provided on the guide block 205, and the support plate 3 is fitted in the guide slot 206; the inner wall of the guide slot 206 At least one magnetic block 207 is provided, the support plate 3 is provided with a magnetic bar 301 corresponding to the magnetic block 207, by inserting the support plate 3 into the guide groove 206, and then passing the magnetic block 207 and The magnetic connection between the magnetic strips 301 enables the support plate 3 to be firmly fixed in the guide groove 206 , while ensuring the parallelism of the support plate 3 . The magnetic block 207 can be an electromagnet, so as to realize the detachable connection to the support plate 3 , when the support plate 3 is inserted into the guide groove 206 , the electromagnet can be activated to realize the fixation.

The inner wall of the guide groove 206 can be provided with several magnetic blocks 207 , the more the magnetic blocks 207 are, the stronger the fixing of the support plate 3 will be. In this embodiment, the inner wall of the guide groove 206 is provided with two magnetic blocks 207 . By keeping the two points apart in a line, the support plate 3 can be fixed on a straight line to ensure that the support plate 3 does not tilt or shift, so that the support plate 3 can be parallelly fixed in the guide groove 206 .

As shown in FIG. 4 , a contact switch 302 is arranged on the support plate 3 , and the contact switch 302 is used to trigger a contact signal by contacting parts. When the part is placed on the support plate 3, it touches the contact switch 302, and the contact switch 302 triggers a contact signal, which is transmitted to the computer or the staff, so that the computer or the staff can carry out the next operation.

As shown in Figure 5, the guide rail 4 includes a limiting portion 401 and an extension portion, and the lifting device includes a stroke cylinder 6;

The extension part is arranged above the limiting part 401 and communicates with each other;

The slider 5 is slidably connected in the limiting portion 401;

The stroke cylinder 6 is arranged on the upper end of the slider 5 and is located in the extension part;

The contact sensor 7 is arranged at the piston end of the stroke cylinder 6 . In this embodiment, the guide rail 4 includes a limiting portion 401 and an extension portion, and the limiting portion 401 and the extending portion are connected to each other and are perpendicular to each other, so as to ensure that the stroke cylinder 6 on the slider 5 can work stably in the vertical direction. The outer wall coincides with the limit part 401, wherein the slider 5 corresponds to the limit part 401, and the limit part 401 and the slider 5 adopt physical limit, that is, lubricating oil is applied between the limit part 401 and the slider 5, and the Both the inner cavity of the limiting part 401 and the outer wall of the slider 5 need to have improved surface smoothness, so as to ensure the coefficient of friction between the slider 5 and the limiting part 401 .

The way the slider 5 moves on the guide rail 4 can be manually pushed or passed by a machine. In this embodiment, as shown in FIG. 1 , a pushing device for pushing the slider 5 to move on the guide rail 4 is also included. Wherein the ejecting device 102 is an existing ejecting mechanism, and its ejecting device 102 can be an existing stroke cylinder 6, or an existing ball screw, and its ejecting device 102 is mainly used to ensure the ejecting distance of the slide block 5. Wherein the guide rails 4 adopt a side-by-side design, and a push-out device 102 corresponds to a slide block 5 in a guide rail 4, and a scale can be set at the upper end of the guide rail 4, so as to determine the current position of the slide block 5, the midpoint of the slide block 5 and the stroke cylinder 6 The central axis coincides, and its contact sensor 7 is located on the central axis of the stroke cylinder 6, so that the position data of the contact sensor 7 can be obtained by combining the scale with the size of the slider 5 .

In addition, in order to achieve the above purpose, the present application also provides a method for correcting milling accuracy based on three-point positioning, using a device for correcting milling accuracy based on three-point positioning, including the following steps:

supporting the part through the support plate 3, and making the bottom of the part contact the contact sensor 7;

Utilize the contact sensor 7 to obtain the bottom parameters of the part;

The attitude of the part is adjusted by the regulator 2 according to the bottom parameter, so that the bottom parameter of the part reaches a set value.

This embodiment is an operation embodiment, a method for correcting milling accuracy based on three-point positioning, including the following steps,

Step 1, place the parts, set one of the regulators 2 as the reference regulator 2, and the rest of the regulators 2 as the support regulator 2, put the side wall of the part against the contact plate 3 of the reference regulator 2, and then place the bottom of the part on The contact plate 3 of the other regulator 2 remains relatively stable. The temporary support is formed by the contact plate 3, and the parts can be adsorbed by the contact plate 3 when necessary, so as to prevent the parts from falling off at will. By constructing a parallel bottom reference plane, it is convenient for later milling measurement and partial trimming measurement.

Step 2, benchmark measurement, move the slider 5 to the corresponding position below the part, drive the contact sensor 7 to move up synchronously through the stroke cylinder 6, so that the contact sensor 7 touches the bottom of the part, and then the contact sensor 7 transmits the signal to the computer and stops The stroke cylinder 6 moves, and the angle of inclination is calculated by the computer analysis through the contact time difference of the contact sensor 7 and the distance between the sliders 5 to obtain attitude parameters. Among them, the contact sensor 7 is an existing commodity, and the contact signal is obtained by touching the part with the contact sensor 7, so that the stroke cylinder 6 stops working, and the rising process of the contact sensor 7 is relatively slow, thereby effectively reducing the risk of possible errors.

Step 3, adjust the posture of the part, drive the contact sensor 7 to separate from the part through the stroke cylinder 6, and then push the bottom of the part through the support regulator 2 to correct the posture. After correction, the stroke cylinder 6 drives the contact sensor 7 to contact the bottom of the part, and analyze it again through the computer Get the attitude parameters, repeat this step until the attitude parameters are within the tolerance range of the tooling pairing, and the attitude adjustment is completed.

Step 4: Milling and fixing the parts after the attitude adjustment is completed, clamping both sides of the parts by the tooling, so that the milling attitude is relatively stable. Wherein the tooling is the existing clamping tooling, the lower end of the tooling is generally lower than the lower end of the parts, and the moving direction of the tooling clamping parts is at an angle of 90 degrees to the relative position direction of the regulator 2, so as to avoid the contact between the regulator 2 and the tooling.

The attitude of the part is adjusted by the regulator 2 according to the bottom parameter, so that the bottom parameter of the part reaches a set value, including:

Step a: After obtaining the bottom parameter of the part, detach the contact sensor 7 from the part;

Step b: adjusting the posture of the part according to the bottom parameter through the regulator 2;

Step c: Touch the contact sensor 7 to the bottom of the part again to obtain the bottom parameter of the part;

Step d: Repeat steps a to c until the bottom parameter of the part reaches the set value.

The device of the present application can adjust the posture of the parts through the principle of three points forming a plane, and can also correct human deviations that may occur during the layout of the device. The pre-support is formed by the adjuster 2, and multiple support points are formed by using multiple adjusters 2, and the placement posture of the part is changed by adjusting the support point. The contact sensor 7 is used to contact the bottom of the part, and the contact sensor 7 is used to form a surface at three points. Based on the principle, the radian of the formed surface is determined in conjunction with the contact time difference, and the distance between the regulators 2 is constant, so that the regulators 2 can be adjusted according to the computer data feedback.

In the present application, the rack tooth 204 on the lifting rod 202 is used to cooperate with the driving wheel 203, so that the moving distance of the lifting rod 202 can be quantified and controlled. The magnetic attraction block 207 on the guide block 205 generates electromagnetic adsorption when necessary, thereby fixing the posture of the contact plate 3, and making the magnetic attraction strip 301 on the contact plate 3 produce a magnetic attraction effect, which is conducive to stabilizing the parts and facilitating external tooling Clamp parts in relative postures.

The method of the present application gradually corrects the attitude of the part when the attitude of the part deviates, so that the attitude of the part is adjusted to the specified position, thereby ensuring the accuracy of rough machining and reducing the risk of deviation that may exist in subsequent finishing machining.

The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structures or equivalent process transformations made by using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields , are all included in the patent protection scope of the present application in the same way.

Claims (8)

1. A device for correcting milling precision based on three-point positioning is characterized by comprising a supporting table, a guide rail set, a supporting plate for supporting the side surface or the bottom surface of a part and an adjuster for adjusting the height of the supporting plate;

the upper surface of the support table is provided with the guide rail group, the guide rail group comprises at least three guide rails, and the guide rails are parallel to each other;

a sliding block matched with the guide rail is arranged on the guide rail, a lifting device is arranged on the sliding block, and a contact sensor used for contacting the bottom of the part is arranged on the lifting device;

the two sides of the guide rail group are respectively provided with a plurality of regulators, each regulator comprises a lifting rod and a driving device, the driving device drives the lifting rod to lift, and the supporting plate is arranged at the top of the lifting rod;

the supporting plate is arranged on the regulator and is positioned above the contact sensor;

also comprises a guide block which is arranged at the top of the lifting rod,

the guide block is provided with a guide groove, and the support plate is arranged in the guide groove in a matching manner;

the guiding groove inner wall is provided with at least one magnetism piece of inhaling, be provided with on the backup pad with magnetism inhale the strip of inhaling that the piece corresponds.

2. The device for correcting milling precision based on three-point positioning as claimed in claim 1, further comprising a mounting cylinder, wherein the driving device comprises a driving motor, a driving gear and strip teeth;

the lifting rod is arranged in the mounting cylinder, and the driving motor and the driving gear are fixed on the mounting cylinder;

the driving motor drives the driving gear to rotate;

the driving gear is in transmission connection with the strip-shaped teeth;

the bar-shaped teeth are arranged in the length direction of the lifting rod.

3. The device for correcting the milling precision based on the three-point positioning as claimed in claim 1, wherein the inner wall of the guiding groove is provided with two magnetic blocks.

4. The device for correcting the milling precision based on the three-point positioning as claimed in claim 1, wherein a contact switch is arranged on the supporting plate, and the contact switch is used for triggering a contact signal by contacting a part.

5. The device for correcting the milling precision based on the three-point positioning as claimed in claim 1, wherein the guide rail comprises a limiting part and an extending part, and the lifting device comprises a stroke cylinder;

the extending parts are arranged above the limiting parts and are communicated with each other;

the sliding block is connected in the limiting part in a sliding manner;

the stroke cylinder is arranged at the upper end of the sliding block and is positioned in the extension part;

the contact sensor is disposed at a piston end of the stroke cylinder.

6. The device for correcting the milling precision based on the three-point positioning as claimed in claim 1, further comprising a pushing device for pushing the sliding block to move on the guide rail.

7. A method for correcting milling precision based on three-point positioning, which is characterized in that a device for correcting milling precision based on three-point positioning according to any one of claims 1-6 is used, and the method comprises the following steps:

supporting a part by the support plate and contacting a bottom of the part with the contact sensor;

acquiring bottom parameters of the part by using the contact sensor;

and adjusting the posture of the part according to the bottom parameter through an adjuster to enable the bottom parameter of the part to reach a set value.

8. The method for correcting the milling precision based on the three-point positioning as claimed in claim 7, wherein the adjusting the posture of the part according to the bottom parameter by the adjuster so that the bottom parameter of the part reaches the set value comprises:

a, step a: separating the contact sensor from the part after the bottom parameters of the part are obtained;

step b: adjusting the posture of the part according to the bottom parameters through the adjuster;

step c: contacting the contact sensor with the bottom of the part again to obtain the bottom parameter of the part;

step d: repeating the steps a to c until the bottom parameter of the part reaches a set value.

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