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零點定位簡介
發(fā)布時間：2023-10-18 16:36:12點擊率：
Zero point positioning
Simply put, it is a unique positioning and locking device that can keep the zero point of the workpiece unchanged from one workstation to another, one process to another, or one machine tool to another. This can save the auxiliary time of resetting the zero point, ensure the continuity of work, and improve work efficiency.
The zero-point positioning system is divided into three parts:
1、Zero point positioning chuck
2、Zero point positioning rivet
3、Zero point positioning tooling
1、Zero point positioning chuck
The zero-point positioning system is a self-locking mechanism that opens during ventilation and locks when the air is cut off. When hydraulic or pneumatic pressure is applied to the zero-point positioning system.
The pressure will compress the spring below through the piston, and the steel balls will spread to both sides, and the rivet can be removed. When the power source is cut off, the spring will push the piston upward, and the piston will retract the steel ball toward the center, thereby clamping the rivet.
2、Zero point positioning rivet
The zero-point positioning system is installed on the workbench of the machine tool, and the rivets are installed on the bottom of the fixture or the bottom of the fixture tray.Repeatable positioning accuracy is mainly ensured through the positioning holes. There are three types of zero-point positioning rivets installed on the bottom of the fixture.
●Positioning rivets: play the role of restricting freedom in the X and Y directions.
●One-way positioning rivet: only restricts the freedom of rotation and plays a directional role.
●Fastening rivets: play the role of increasing the tensioning force to ensure the complete positioning of the pallet and avoid over-positioning.
Each zero-point base has its corresponding rivet installation sequence. Once the rivet installation sequence on the pallet is incorrect, it will lead to serious deviations in processing accuracy.
●Pull nail installation distribution diagram
3、Zero point positioning tooling
In the traditional processing method, the replacement of parts requires online installation, and adjustment and inspection procedures are required. It is time-consuming to complete a set of work.Using the zero-point positioning system, pre-clamping can be performed outside the machine. After the parts are processed, the "integral" replacement can be directly carried out in a few seconds, reducing downtime by 90%.
The video provides a detailed comparison of the differences between using zero-point quick changes and traditional dress changes:
Advantage：
●Quick clamping:
The zero-point positioning chuck can realize fast and efficient workpiece clamping. With pre-set positions, the workpiece can be positioned and clamped quickly and accurately, saving a lot of clamping time.
●High-precision positioning:
Zero-point positioning chucks usually have high-precision positioning capabilities, which can ensure the accurate positioning and alignment of the workpiece, thereby improving the accuracy and quality of processing.
●Good repeatability:
Once the zero-point positioning chuck has set the position of the workpiece, it can be reused and can maintain the same position and alignment each time it is clamped, ensuring the consistency and stability of the workpiece.
Disadvantages：
●The zero-point chuck is suitable for modular production, but it is not suitable for the processing of spare parts.
●The initial investment cost of zero-point chuck is high, and it requires the design of different tooling and the establishment of a modular production system.
●The initial investment cost of zero-point chuck is high, and it requires the design of different tooling and the establishment of a modular production system.
Zero positioning chuck use case
Engine box clamping case
Automobile 4-cylinder engine clamping case
3C product batch processing
