Just started working in non-standard automation? Understand the three core design requirements of machining automation first

For friends who have just entered the field of non-standard automation, the first project they are likely to take on is the automation transformation of processing - whether it is doing loading and unloading for machining workshops or adding positioning and drilling processes to stamping production lines, the principles may not seem complicated, but when they really get started with drawing and modifying plans, they realize that no matter how much adjustment is made, it cannot meet the on-site requirements? Either the workpiece often cannot be installed, or it is difficult to maintain, and even cannot pass the safety inspection and receive the final payment.

In fact, as the most common branch in the non-standard field, processing automation has a different core design logic from general non-standard equipment. As long as you understand the three core requirements first, you can avoid half a year of detours.

The first core requirement is a flexible positioning design that is compatible with incoming material errors. Many beginners who have just started designing are filled with the idea that "the higher the precision, the better". They wish they could mark the tolerances of all parts to the highest level, but the resulting equipment gets stuck as soon as it arrives on site. Processing automation has never faced 100% standardized mass-produced parts. There are inherent errors in upstream blanks and semi-finished products, ranging from tolerances of several millimeters for casting blanks to deviations of a few millimeters for stamping positioning holes, far exceeding the design tolerances of the equipment itself.

I have seen a newcomer in the automation of drilling for automotive stamping parts before. In order to ensure accuracy, the gap between the positioning pin and the workpiece positioning hole was only 0.05mm. As a result, one-third of the workpieces on site could not be inserted. Finally, it was changed to a floating positioning pin with a spring reset, allowing the positioning pin to have an adaptive swing of about 1mm and automatically adapt to workpiece errors. The problem was solved in one fell swoop.

The core of processing automation design is never to achieve the highest precision, but to create designs that can accommodate errors, ensuring that the equipment can stably produce qualified workpieces when the incoming materials fluctuate within the tolerance range given by the customer. This is the first step of qualified design.

The second core requirement is a modular split design that prioritizes maintainability. Many novice designers like to make the structure as compact and integrated as possible. The drawings look simple and beautiful, but they only realize on the production site that maintenance can drive workers crazy. Processing automation is a high-frequency production equipment, and cutting tools, positioning blocks, clamping cylinders, and conveyor belts are all vulnerable parts that need to be replaced and adjusted in as little as half a month or three months. If half of the equipment needs to be dismantled to replace one part, customers will never be satisfied.

Previously, a newcomer was working on an automatic loading and unloading equipment for a CNC lathe. In order to save space, the material bin adjustment mechanism was inserted into the gap of the equipment frame. To change workpieces of different sizes on site, two people needed to squat in the gap and screw the material rod position, which took two hours to adjust once. Later, it was changed to an external quick release modular structure, which can be adjusted without removing any protective cover. The lock buckle can be loosened and the adjustment can be completed in ten minutes.

Remember, processing automation is for customers, not for showcasing design skills. When designing, priority should be given to leaving enough operating space in the vulnerable parts area, breaking down different functional structures into independent modules, and never making customized parts where standard parts can be used, making it easier for customers to quickly replace and repair. This is more valuable than flashy innovation.

The third core requirement is a redundant security design that meets compliance requirements. Safety is the most easily overlooked point for many beginners, thinking that as long as the equipment can operate stably and protection can be done casually, it will not pass the safety audit during acceptance, and they will have to rework if they cannot get the final payment, which is not worth the loss. There are many risk points in machining automation itself: high-speed rotating cutting tools, splashing high-temperature chips, high-pressure coolant, and high-speed moving robotic arms. Inadequate protection at any point can lead to safety accidents.

Safety design is never enough to meet minimum standards, and sufficient redundancy must be left: do not omit a travel switch in places where double door interlocking should be installed, use sufficiently strong boards for chip blocking shields, and leave a chip discharge slope to avoid chip accumulation and leakage. The travel limit of moving parts should be equipped with multi-level limit devices. Nowadays, whether it is customer factory inspections or third-party safety audits, the safety requirements for automation equipment are becoming increasingly strict. Ensuring safety is not only to protect users, but also to protect oneself.

For non-standard designers who have just entered the industry, they are most likely to fall into the trap of pursuing high precision and showing off skills, and instead ignore the most essential requirements of machining automation. The core of non-standard automation is to solve customers' practical problems. Only by implementing these three core requirements can the equipment run stably and help oneself accumulate experience faster, and establish a firm foothold in the industry.