CN113867270B

CN113867270B - Tool retracting mode capable of being used for five-axis numerical control machine tool

Info

Publication number: CN113867270B
Application number: CN202111473062.0A
Authority: CN
Inventors: 许德兵; 任立伟; 包鹏超; 刘翔云; 张广路; 李敏; 刘通; 刘佃凯; 于忠梅
Original assignee: Jier Machine Tool Group Co Ltd
Current assignee: Jier Machine Tool Group Co Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-04-12
Anticipated expiration: 2041-12-06
Also published as: CN113867270A

Abstract

The invention discloses a tool retracting mode for a five-axis numerical control machine tool, and relates to the technical field of numerical control machine tools. A tool retracting mode for a five-axis numerical control machine tool comprises the following steps: when the machine tool normally operates, storing the axial position coordinates of the machine tool cutter in an appointed PLC variable block in real time, and setting the variable block to be stored in a power-off state; step two: after the machine tool is powered off and restarted, firstly detecting whether the axial position coordinate of the cutter is consistent with the axial position coordinate of the reference point in a PLC program, if not, transferring data in the variable block of the storage position to a system variable in a system, and then introducing the system variable with the position data into a circulating operation program in advance; step three: and the cutter is retracted along the normal direction by operating a cyclic operation program. The invention can safely and quickly withdraw the cutter along the normal direction in a mode of selecting the incremental encoder on the A/C (B/C) shaft, thereby avoiding damaging the cutter or a workpiece.

Description

Tool retracting mode capable of being used for five-axis numerical control machine tool

Technical Field

The invention relates to the technical field of numerical control machines, in particular to a tool retracting mode for a five-axis numerical control machine.

Background

In a five-axis numerical control machine tool, when an A/C (B/C) rotating shaft selects a measuring system, an incremental encoder can be selected, and an absolute value encoder can also be selected; the incremental encoder is low in price, but the axis coordinate is lost after the machine tool is powered off every time, and the axis coordinate needs to return to zero again when the machine tool is restarted; the absolute value type encoder is relatively high in price, the shaft coordinate cannot be lost after the power failure restart, and zero return is not needed. In the normal operation working condition of the machine tool, the two encoders can meet the use requirement, but if the machine tool is suddenly powered off when a hole with an inclined plane or a curved surface is machined by the deflection angle of an A/C (B/C) shaft, the cutter can be clamped in the hole at the moment. After the machine tool is electrified again, the machine tool needs to be retracted to a safe position along the normal direction of the cutter, and at the moment, if an A/C (B/C) rotating shaft is selected as an absolute value type encoder, the A/C (B/C) shaft coordinate can be directly converted into a five-shaft coordinate system through a TRAORI coordinate system, and the machine tool can be directly retracted along the normal direction of the cutter; if the A/C (B/C) rotating shaft is selected as the incremental encoder, because the machine tool cannot return to zero at this time, the coordinate value of the A/C (B/C) shaft is unknown, and the A/C (B/C) shaft cannot be converted into a five-shaft coordinate system through TRAORI, namely, the tool can not be withdrawn in the normal direction.

When the five-axis machine tool with the A/C (B/C) rotating shaft provided with the incremental encoder meets the above conditions, the cutter cannot be withdrawn in the normal direction, and the risk that the cutter or the workpiece is damaged exists; through this patent, can be safely, fast under the mode of A/C (B/C) axle selection increment encoder withdraw from the cutter along normal direction, avoid haring cutter or work piece.

Disclosure of Invention

The invention aims to provide a tool retracting mode for a five-axis numerical control machine tool, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a tool retracting mode for a five-axis numerical control machine tool comprises the following steps:

the method comprises the following steps: when the machine tool normally operates, storing the axial position coordinates of the machine tool cutter in an appointed PLC variable block in real time, and setting the variable block to be stored in a power-off state;

step two: after the machine tool is powered off and restarted, firstly detecting whether the axial position coordinate of the cutter is consistent with the axial position coordinate of the reference point in a PLC program, if not, writing data in the variable block of the storage position into a system variable in the system, and then importing the system variable with the position data into a circulating operation program in advance;

step three: and the cutter is retracted along the normal direction by operating a cyclic operation program.

Furthermore, in the second step, if the coordinate position of the tool axis is consistent with the coordinate position of the reference point axis, the operation of the third step is not required.

Further, the system in step two is Siemens system, and the system variable name is $ A _ DBR [100 ].

Further, the loop running program in the second step is CYCLE800, and the system variables can be imported into CYCLE 800.

Furthermore, the third step is performed non-automatically, and the third step needs to observe whether the tool is returned or not and then manually perform the operation of the cyclic operation program.

Further, the tool axis position coordinates in the first step include X, Y, Z axis coordinates of the tool in space, and the coordinates of the tool X, Y, Z axis are combined to be the normal position of the tool.

Compared with the prior art, the invention has the beneficial effects that:

the tool retracting mode for the five-axis numerical control machine tool can safely and quickly retract the tool in the normal direction in the mode that the A/C (B/C) shaft selects the incremental encoder, so that the tool or a workpiece is prevented from being damaged.

Drawings

Fig. 1 is a schematic view of the operation principle of the tool retracting mode of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, and that the thickness or width of some layers may be exaggerated relative to other layers, for example.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one figure, it will not need to be further discussed or illustrated in detail in the description of the following figure.

Determining the actual position of an A/C (B/C) shaft according to the actual condition of a machine tool in machining, and further determining the normal direction of the tool shown in the figure 1; then, a large number of PLC programs are compiled, data position information is acquired, variable blocks for storing data are established, whether the machine tool shaft is in a return-to-zero state or not is judged, and if the machine tool is not in the return-to-zero state, the blocks for storing the data are written into a system variable $ A _ DBR [100 ];

the CYCLE800 instruction is stored in advance in the system loop, and the instruction comprises a variable $ A _ DBR [100], namely the stored actual position information; if the coordinate system needs to be converted, the CYCLE800 instruction is read and executed through one key of the key, at the moment, the CYCLE800 instruction is automatically converted into a correct five-axis coordinate system according to the coordinate position before power failure, and at the moment, only one axis of the Z axis needs to be selected, the machine tool can automatically perform three-axis linkage to withdraw the cutter in the normal direction.

As shown in fig. 1, the present invention provides a technical solution: a tool retracting mode for a five-axis numerical control machine tool comprises the following steps:

the method comprises the following steps: when the machine tool normally operates, storing axial position coordinates of a machine tool cutter in a designated PLC variable block in real time, wherein the axial position coordinates of the cutter comprise coordinates of the cutter on an X, Y, Z axis in space, combining the coordinates on a X, Y, Z axis to be a normal position of the cutter, and setting the variable block to be power-off for storage;

step two: after the machine tool is powered off and restarted, whether the axial position coordinate of the cutter is consistent with the axial position coordinate of the reference point is detected in a PLC program, if not, data in a variable block of a storage position is written into a system variable in a system, the system is a Siemens system, the name of the system variable is $ A _ DBR [100], then the system variable with the position data is led into a circulating operation program in advance, the circulating operation program is CYCLE800, the system variable can be led into the CYCLE800, and if the axial position coordinate of the cutter is consistent with the axial position coordinate of the reference point, the operation of the third step is not needed;

step three: the cutter is retracted along the normal direction by operating the cyclic operation program, and the operation of the cyclic operation program is manually performed after the cutter needs to be observed whether to return or not.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a can be used to five digit control machine tool's mode of moving back sword which characterized in that: the method comprises the following steps:

the method comprises the following steps: determining the actual position of an A/C or B/C axis according to the actual condition of a machine tool in machining, and further determining the normal direction of a cutter; then, by compiling a PLC program, acquiring data position information, establishing a variable block for storing data, storing the axial position coordinates of a machine tool cutter in a designated PLC variable block in real time when the machine tool operates normally, wherein the axial position coordinates of the cutter comprise the coordinates of the cutter on X, Y, Z axes in space, combining the coordinates of the cutter X, Y, Z axes to form the normal position of the cutter, and setting the variable block to be stored in a power-off state;

step two: after the machine tool is powered off and restarted, firstly detecting whether the position coordinate of the cutter shaft is consistent with the position coordinate of the reference point shaft in a PLC program, if not, writing data in a variable block of a storage position into a system variable $ A _ DBR [100] in a system, and then leading the system variable with the position data into a circulating operation program CYCLE800 instruction in advance, wherein the instruction comprises the variable $ A _ DBR [100], namely the stored actual position information; if the coordinate position of the tool shaft is consistent with the coordinate of the reference point shaft, the operation of the third step is not needed;

step three: if the coordinate system needs to be converted, the CYCLE800 instruction is read and executed through one key of a key, at the moment, the CYCLE800 instruction is automatically converted into a correct five-axis coordinate system according to the coordinate position before power failure, and at the moment, only one axis of a Z axis needs to be selected, the machine tool can automatically perform three-axis linkage to withdraw the cutter in the normal direction; the operation of the cyclic operation program is manually performed after the tool is reset.