Even the most powerful heat-resistant and wear-resistant gantry robots are not immune to non-human-caused malfunctions, such as inconsistent workpiece dimensions. While malfunctions can reduce profit margins, it's crucial to take appropriate emergency measures to mitigate losses. So how do we diagnose and resolve malfunctions? For example, the gantry robot's driver phase lights are normal, but the machined workpiece dimensions fluctuate. This is caused by the machine tool slide operating at high speed for extended periods, leading to errors in the tool holder's repeatability over time. The slide returns accurately to the starting point each time, but the workpiece dimensions still change. This phenomenon is generally caused by the spindle; the high-speed rotation of the spindle causes severe bearing wear, resulting in changes in machining dimensions. The solution is to use a dial indicator against the bottom of the tool holder, simultaneously modifying a fixed cycle program through the system to check the slide's repeatability, adjust the lead screw clearance, and replace the bearings. For servo electric cylinders, use a dial indicator to check the tool holder's repeatability, adjust the mechanism, or replace the tool holder. The workpieces machined by the gantry robot are accurate to standard, but the surface finish is poor. This problem may be caused by a damaged or dull cutting tool tip, or by resonance within the gantry robot itself, leading to instability and slight errors in the machining process. The solution is to remove the worn or damaged dull parts of the cutting tool and select a better tool for re-tooling. When the gantry robot resonates or is unstable, it needs to be leveled and stabilized.
The high reputation of gantry robots is inseparable from their excellent functional features. The biggest advantage of gantry robots is their ability to repeat actions, and linear motors overcome the fatigue that easily occurs during human operation. Gantry robot teams utilize advanced automation technology to fundamentally reduce the probability of malfunctions, and any malfunctions can be handled according to appropriate emergency procedures. High-quality robot seventh axes combine automated and flexible production features, and have been widely and rapidly adopted in the Chinese market in recent years. Especially in recent years, domestic manufacturers have attached great importance to the application of robot seventh axes. Currently, robot seventh axes in my country primarily have the following three functions:
I. Movement and Positioning of the Robotic Arm Moving Cart
The movement and positioning of the robotic arm's mobile carriage in the straight direction can be directly modified via the control panel and display screen. Theoretically, the miniature electric motor can set an unlimited number of positioning points within the effective travel range of the linear axis. Positional accuracy is accurately detected by an encoder and ensured by a servo system controlling the motor, with repeatability within a certain range. The moving speed can be arbitrarily set according to operational requirements within a specified range.
II. System Procedure Control
The robot's seventh axis system uses digital signal transmission for both its signal interface with the "robot" and the "machine tool" system, ensuring mutual stability and reliability. It features both manual and automatic operation control methods; in manual mode, the single-axis arm can operate a single workstation independently; in automatic mode, it operates automatically according to a set program.
III. Software Functions
The robot's seventh axis can complete the pouring operation sequentially according to the order of activation, and can clear all unexecuted signals after signal reset. The seventh axis can immediately interrupt the ongoing action by activating any emergency stop button; the equipment can only resume normal operation after the emergency stop is reset. If the orthogonal robot sends two signals in quick succession, the seventh axis will only execute one signal and will not pour twice consecutively; a complete system backup is available after program upgrades.
