| Comprehensive Analysis of Precautions for Running Pushing Machines: Safety Operation and Maintenance Guidelines In the modern mechanical processing and manufacturing field, pushing machines, as a key metal forming equipment, are widely used in the manufacturing processes of pipe fittings, elbows, flanges, and other products. Whether it is an enterprise engaged in pipe fitting production or a workshop involved in metal hot working, the stable operation of pushing machines directly affects product quality, production efficiency, and the personal safety of operators. Based on the production experience of professional equipment manufacturers such as Cangzhou Aoguang Machinery Equipment Co., Ltd., this article will comprehensively and systematically elaborate on the key points that need special attention during the operation of pushing machines, helping operators and managers establish a complete safety operation standard. I. Necessary Checks Before Running the Pushing Machine Before a pushing machine is officially put into operation, a comprehensive inspection must be carried out, which is a prerequisite for ensuring the safety and stability of the subsequent production process. First, operators should carefully check the tightness of all connection parts of the equipment, including anchor bolts and connection bolts of various components, to prevent loosening and detachment due to vibration during operation. Secondly, the oil level of the hydraulic system and lubrication system should be checked to ensure it is within the normal range, and the oil quality should meet the requirements, with no leakage in the oil lines. In terms of the electrical system, it is necessary to confirm that all components in the control cabinet are working properly, the wiring is reliable, and the grounding protection is intact and effective. In addition, the heating system of the pushing machine is one of the core components. Before operation, the integrity of the heating elements should be checked, as well as the sensitivity and accuracy of the thermocouples and the normal display of the temperature control instruments. For pushing machines that use medium-frequency induction heating, the insulation performance of the induction coil and the working status of the cooling water circulation system should also be checked. The installation of the mold is also a key inspection item. It is necessary to ensure that the mold is firmly fixed, the surface of the mold cavity is smooth and undamaged, and the lubricant is evenly applied. II. Key Points of Temperature Control During Operation During the operation of the pushing machine, temperature control is a key factor in determining product quality. Different types of metal materials have different hot working temperature ranges. Operators must strictly set the heating temperature according to the process regulations. If the temperature is too low, it will lead to poor metal fluidity, increased pushing resistance, which may cause equipment overload or product cracking; if the temperature is too high, it will easily cause material overburning, coarse grains, and reduced mechanical properties of the product. During operation, operators should continuously monitor temperature changes and observe whether the temperature display instrument data is stable within the set range. For pushing machines with multi-zone heating, the temperatures of each zone should be kept consistent to avoid local overheating or overcooling. When abnormal temperature fluctuations are detected, the pushing action should be immediately paused, the cause identified, and the fault eliminated before continuing production. It should be noted that the heating system of the pushing machine generates high temperatures during operation. Operators should maintain a safe distance from the heating area to avoid scalding accidents. At the same time, no flammable or explosive items should be stacked around the equipment, and necessary fire-fighting equipment should be provided. III. Reasonable Control of Pushing Speed and Feed Rate The selection of pushing speed and feed rate directly affects the forming quality of the product and the service life of the equipment. If the pushing speed is too fast, it may lead to uneven metal deformation, wrinkles or cracks on the inner wall, and increase the load on the hydraulic system and transmission mechanism; if the pushing speed is too slow, it will affect production efficiency and may cause the metal to stay in the mold cavity for too long and overheat. Operators should set the pushing speed reasonably based on factors such as the material, wall thickness, and diameter of the pipe blank, as well as the pushing temperature. Generally, the pushing process should be carried out at a uniform speed to avoid sudden changes in speed. The pressure gauge reading of the hydraulic system should be stable within the set range. If an abnormal increase in pressure is detected, it indicates excessive pushing resistance, and the temperature should be checked to see if it is within the standard, whether the mold is worn, or if the lubrication is good. In practical operation, it is recommended to adopt a "slow-fast-slow" pushing speed curve. That is, in the initial stage, push slowly to ensure the metal fills the mold cavity evenly. In the middle stage, the speed can be appropriately increased. Near the end of the forming process, slow down again to ensure the dimensional accuracy of the product. For pipe fittings with larger wall thickness, the pushing speed should be appropriately reduced to ensure uniform temperature of the inner and outer walls and sufficient deformation. IV. Operation and Management of Lubrication and Cooling Systems During the operation of the pushing machine, the normal operation of the lubrication and cooling systems is of vital importance. Good lubrication can significantly reduce the pushing resistance, reduce mold wear, and improve the surface quality of the product. The pushing machine usually uses graphite lubricant or special high-temperature lubricant. Operators should select the appropriate type of lubricant based on the product specifications and material properties, and control the spraying amount and frequency properly. Excessive lubricant spraying will cause waste and environmental pollution, while too little will not achieve good lubrication effects. During the pushing process, the surface condition of the product should be observed. If obvious scratches or marks are found, it usually indicates insufficient lubrication, and lubricant should be replenished in time. For pushing machines with automatic lubrication systems, the nozzles should be checked regularly for blockages and the pipelines for unobstructed flow. The cooling system mainly consists of mold cooling and hydraulic oil cooling. Mold cooling can effectively control the mold temperature and prevent deformation or early failure due to overheating. Hydraulic oil cooling ensures that the oil temperature of the hydraulic system is within a reasonable range (usually 35-55℃). Excessively high oil temperature will reduce the viscosity of the hydraulic oil, affect the performance of hydraulic components, and accelerate the aging of seals. Operators should regularly check the flow and temperature of the cooling water to ensure the normal operation of the cooling system. V. Identification and Emergency Handling of Abnormal Situations During the long-term continuous operation of the pushing machine, various abnormal situations may occur, and operators must have the ability to quickly identify and properly handle them. Common abnormal phenomena include abnormal sounds, vibrations, pressure fluctuations, and temperature out of control. When the equipment emits abnormal sounds, the source of the sound should be determined first. Sharp metal friction sounds may come from dry friction between the mold and the tube blank, requiring a check of the lubrication system; dull impact sounds may come from excessive clearance or looseness of the transmission components; continuous abnormal sounds may come from bearing damage or gear failure. Abnormal sounds should be immediately stopped for inspection and production should not be forced to continue. Increased equipment vibration is usually related to the following factors: excessive deviation of the coaxiality between the tube blank and the mold, uneven pushing speed, loose foundation or component wear. Operators should use dial indicators and other tools to detect coaxiality and readjust the alignment if necessary. Abnormal pressure fluctuations in the hydraulic system may be caused by pump wear, stuck relief valves, or air in the oil lines. First, check the oil level in the tank and remove the air before conducting a pressure test. If the pressure remains unstable, contact professional maintenance personnel for handling. VI. Safety Operation Regulations During Operation Safety is the eternal theme during the operation of the pushing machine. Operators must undergo professional training, be familiar with the equipment performance and operating procedures, and untrained personnel are strictly prohibited from operating the equipment. During operation, operators should wear work clothes that meet the requirements, and wear protective glasses, protective gloves and other necessary personal protective equipment. It is strictly prohibited to perform cleaning, adjustment or maintenance operations while the equipment is running. When cleaning the mold or handling the tube blank, the pushing action must be stopped first. Wait until the heating system is turned off and the temperature drops to a safe level before proceeding with the operation. During equipment operation, hands must not approach the pushing area, transmission components, or heating parts. In addition, the area around the pushing machine should be kept clean and unobstructed. The ground should be free of oil stains, water stains, or debris to prevent personnel from slipping. The location of the emergency stop button should be obvious and easy to operate. The function of the emergency stop device should be tested at least once a month to ensure it is normal. When encountering an emergency situation that may endanger personal or equipment safety, the operator has the right to immediately press the emergency stop button without waiting for instructions from a superior. VII. Filling and Analysis of Operation Records Standard and complete operation records are the foundation of the management of the pusher machine. After each production task is completed, the operator should truthfully record the following information: production date, product specifications, material of the tube blank, pushing temperature, pushing speed, pressure of the hydraulic system, amount of lubricant used, operating time of the equipment, abnormal situations and measures taken, etc. Regular analysis of operation records can help managers identify potential problem trends of the equipment. For example, if the hydraulic pressure of a certain pusher machine gradually increases, it may indicate that the mold is worn or the efficiency of the hydraulic system is decreasing; if the consumption of lubricant abnormally increases, it may suggest that the spraying system control is inaccurate or there is a leakage. Preventive maintenance based on data analysis can significantly reduce the probability of sudden equipment failures and extend the service life of the equipment. VIII. Shift Handover and Continuous Production Management For enterprises that require continuous production, the shift handover management of the pusher machine is particularly important. The off-duty operator should inform the on-duty operator in detail about the equipment operation status, existing problems, and precautions before leaving work, and fill in the shift handover record. The on-duty operator should conduct a comprehensive inspection of the equipment before officially operating it and can only start production after confirming that there are no abnormalities. During continuous production, it is necessary to reasonably arrange short periods of downtime for inspection to allow the equipment to get the necessary "rest". Long-term uninterrupted operation can lead to problems such as excessively high hydraulic oil temperature, accelerated aging of electrical components, and thermal fatigue of the heating system. It is recommended to arrange a 15-30 minute downtime for inspection every 4-6 hours to perform maintenance tasks such as lubrication, tightening, and cleaning. IX. Precautions after Equipment Shutdown The shutdown operation after the pusher machine stops running also needs to be carried out in a standardized manner. First, the heating system should be turned off, but the hydraulic system and cooling system should continue to operate for a period of time. Only after the equipment temperature drops to a safe range should they be turned off. This can prevent component damage caused by local overheating. After shutdown, the operator should clean the oil stains, lubricant residues, and metal oxides on the surface of the equipment, especially the mold surface should be thoroughly cleaned and protected with anti-rust oil. The filter element of the hydraulic system should be regularly replaced or cleaned, and the sediment in the oil tank should be regularly discharged. The interior of the electrical control cabinet should be cleaned with a vacuum cleaner or dry cloth, and wet cloths or compressed air should not be used (to prevent dust from entering the components). Finally, turn off the main power switch and hang a "Equipment Shutdown" warning sign. Fill in the complete operation record, return the tools and measuring instruments to their places, and clean the work area before leaving. Conclusion The safe and stable operation of the push forming machine is a systematic project, involving multiple aspects such as operational skills, maintenance and upkeep, and safety management. From a comprehensive inspection before the equipment starts up, to the control of temperature, speed and lubrication during operation, to the identification and handling of abnormal situations, and to the standardized operation after shutdown, every link requires the high attention of operators and managers. As a professional manufacturer of mechanical equipment, Cangzhou Aoguang Machinery Equipment Co., Ltd. has always emphasized the production concept of "safety first, prevention foremost". We hope that the precautions summarized in this article can help users better use and maintain the push forming machine equipment, and achieve the production goals of high efficiency and high quality under the premise of ensuring the safety of personnel and equipment. Remember: standardized operation habits are the best safety insurance, and timely maintenance and upkeep is the most economical way of repair. |
