Two cases of malfunction maintenance of 94 movable

2022-06-22
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9.4 two cases of fault maintenance of the moving chip removal device

the chip removal device is a necessary accessory device of the CNC machine tool, and its main function is to discharge the chips from the processing area out of the CNC machine tool. The normal machining of CNC machine tools can be ensured only by quickly and effectively removing chips. The chip removal device is generally installed as close to the tool cutting area as possible. For example, the chip removal device of the lathe is installed under the rotating workpiece; The chip removal devices of the milling machine and the machining center are installed on the return water groove of the machine body or at the side of the workbench, which is conducive to simplifying the structure of the machine tool or chip removal device, reducing the floor area of the machine tool and improving the chip removal efficiency. The discharged chips generally fall into the chip collection box or trolley, and some are directly discharged into the workshop chip removal system. There are many kinds of chip removal devices. The figure shows several common chip removal devices. 1. flat chain type chip removal device this device uses the rolling sprocket to pull the steel flat chain belt to run in the closed box. The chips in processing fall on the chain belt. After lifting, the cutting fluid in the waste is separated. The chips are discharged from the machine tool and fall into the chip storage box. This device can eliminate chips of various shapes and has strong adaptability. It can be used in all kinds of machine tools. When used on the lathe, it is usually integrated with the cutting fluid tank of the machine tool to simplify the structure of the machine tool. The flat chain chip conveyor is an accessory with independent functions. Before switching on the power supply, check whether the lubricating oil of the reducer extends from the pure production of aluminum alloy bars to plates, profiles, high-end electronic profiles, rail transit light-weight composite materials, etc. in terms of product development is lower than the oil level line. If it is insufficient, add the oil of No. 40 full loss system to the oil level line. After the motor is started, immediately check whether the rotation direction of the sprocket is consistent with the direction indicated by the arrow. If not, immediately correct it. There will also be a certain difference in the experimental equipment applicable to different pipes. The sprocket of the chip removal device is equipped with an overload safety clutch, which has been adjusted during factory commissioning. If the friction plate is found slipping after the motor is started, stop immediately and check whether the chain belt is stuck by foreign matters or other reasons. After the causes are found out, the motor can be started again. If it can operate normally, the fault has been eliminated; If it cannot run smoothly, the reasons can be found from the following two aspects: 1) whether the pressing force of the friction plate is sufficient. First, check whether the compression of the Belleville spring is within the specified value; The free height of Belleville spring is 8.5mm, and the compression shall be 2 Mm, if this value is within, it means that the pressing force is sufficient for the main engine; If the compression is not enough, tighten three M8 compression screws evenly. 2) If it continues to slip after pressing, the cause of jamming shall be comprehensively checked. 2. scraper type chip removal device the transmission principle of the device is basically the same as that of the flat chain type, except that the chain plate is different. It has a scraper chain plate. This device is often used to transport short and small chips of various materials, with strong chip removal ability; Because of its large load, it is necessary to use a high-power electric drive. 3. spiral chip removal device is driven by a long screw rod installed in the groove driven by a motor through a reducer. When the screw rod rotates, the chips in the groove are pushed forward continuously by the screw rod and finally discharged into the chip collection box. There are two forms of spiral rod. One is to roll a flat steel bar into a spiral spring shape, and the other is to weld a spiral steel plate on the shaft. The device occupies a small space and is suitable for installation in a position with a narrow gap between the machine tool and the column. The spiral chip removal device has simple structure and good chip removal performance, but it is only suitable for chip removal along the horizontal or small angle inclined straight direction, and cannot be used for large angle inclined, lifting or turning chip removal. Example 399~ example 400. fault maintenance with difficult chip removal example 399. fault phenomenon: zk8206 CNC scraping end face drilling center hole machine tool, difficult chip removal, motor overload alarm. Analysis and treatment process: the zk8206 CNC scraping end face drilling center hole machine tool adopts a spiral chip conveyor, and the chips in processing fall into the groove where the spiral chip conveyor is located along the inclined plane of the machine body. When the screw rod rotates, the chips in the groove will be pushed forward continuously by the screw rod, and finally discharged into the chip collection box. During the design of the machine tool, in order to separate the cutting fluid from the waste during the lifting process, a cylindrical chip discharge port with a diameter of 160mm and a length of 350mm is installed at the discharge port of the chip conveyor, and the chip discharge port is inclined upward by 30. During the test run of the machine tool, a large number of chips are blocked at the chip discharge port, and the motor overload alarm is given. The reason is that during the lifting process, the cuttings are rubbed by the inner wall of the cylindrical chip discharge port, extruded and accumulated in the cylindrical chip discharge port. After changing the cylindrical chip removal port to the horn chip removal port, the cone angle is greater than the friction angle, and the fault is eliminated. Example 400. fault phenomenon: the scraper chip conveyor of the mc320 vertical machining center machine tool does not operate, so it is impossible to remove the chips. Analysis and treatment process: mc320 vertical machining center adopts scraper chip conveyor. The chips in processing fall into the scraper type chip conveyor along the inclined plane of the machine body. The scraper is pulled by the chain belt and operates in the closed box. The chips are lifted to separate the cutting fluid from the waste. The chips are discharged from the machine tool and fall into the chip storage box. The reasons for the non operation of the scraper chip conveyor may be as follows: 1) insufficient pressing force of the friction plate: first check whether the compression amount of the Belleville spring is within the specified value: the free height of the Belleville spring is 8.5mm, and the compression amount should be 2.6 ~ 3mm. If it is within this value, it indicates that the pressing force is sufficient; If the compression is not enough, tighten three M8 compression screws evenly. 2) If it continues to slip after pressing, the cause of jamming shall be comprehensively checked. It is found that there are several screws in the chip conveyor, one of which is stuck between the scraper and the chip conveyor body. Remove the stuck screw and remove the fault

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