There are already some basic regulations and regulations for mold fastening methods and procedures in rapid tool change. include:
1, such as the safety regulations required by OSHA and good engineering experiments.
2, good management, can improve the quality of each component while improving the quality and guarantee on time delivery.
3. Physical principles defined by metallurgical and mechanical sciences.
First, the basic requirements of mold fastening Federal OSHA mold fastening regulations are: "In order to safely install the mold on the table and the slider, the upper and lower mold sleeves need to be prepared. Use the lock nut or set the screw joint When using the mold shank, an additional safety measure for the slider should be used.
2. Recommended Die Positioning Fastening Devices When using threaded fastening devices, it is essential to determine the sufficient size and number of heat treated alloy bolts. Not using ordinary carbon steel or soft bolts is actually a waste of money. Advanced bolts can be used for longer periods of time. The bolt head is neither chamfered nor threaded and does not wear out and wear quickly. Cheap fastening devices can experience rapid wear, elongation and potential failure. It is recommended to use SAE8 or equivalent fastening devices in the mold positioning. The same mold fastening device is also used in the mold combination work. The fasteners used in the mold fastening device and mold combination are of the ASTM degree, the name is A354, the bolts are grade BD, ISO 10.9 or 12.9 performance grade. These devices have similar yield and tensile strengths as the recommended SAE and ASTM fastening devices. These fastening devices are marked with six identification marks on the head. The metric mold standard specifies bolt performance grades for ISO 10.9 or 12.9 for mold fastening devices and mold combinations. Its yield and tensile strength are similar to the recommended SAE and ASTM fastening devices. The metric fastening device has a specified number of performance grades and is stamped with the manufacturer's mark on the head.
The Fastening Device Quality Act of 1990 (Public Laws 101-592) specifies quality requirements for critical high-strength fastening devices, such as the recommended devices for mold positioning. In addition to the grade marking, a manufacturer's mark is required.
Third, avoid using a possible failure of the fastening device should not use a full thread screw. Some tapping screws have performance equivalent to class 8 or equivalent. However, this material is not recommended as there are no shortcuts to mark the rod. Never use a welding method to make a screw-type fastening device for fixing and handling.
Fourth, the type of tapping type fastening device
One advantage of the T-slot screw is that a larger fastening device than a hex screw can be used. T-slot screws and hexagonal screws are commonly used for machining and are not recommended for use in press processing. It can only be used conditionally for light load work, thread engagement is not self-testing, and the screw may penetrate the T-slot.
The strength of the tapping hole is usually three or more times the SAE screw level 8 or the mold positioning recommended ISO performance level of 10.9 or 12.9. These screws are made of a heat treated alloy. The main problem with some older presses is the absence of a T-slot. The absence of a T-slot press beam is the main cause of delays in mold installation and may result in mold failure. Machining a T-slot, reworking the press beam or slider is a very expensive repair process. If the beam is of cast iron construction, it is not possible to machine the T-slot because it will weaken the strength of the casting.
5. Add T-slot slabs to the beam. The closing height of the beams lacking T-slots is much larger than required. This situation occurs in the manufacture of automotive body attachment machinery where large closing heights are required to accommodate large molds and automation spaces.
Sixth, the clamping height and the positive positioning method of the standardization of the fastening height are the key to rapid repeated mold change. Considering time savings and molder inventory, it is advisable to use a standardized clamping height on all molds. It is not necessary to consider whether the mold uses steel strips and setting blocks or hydraulic clamping fasteners.
When the required constraint height is more than one, a system with a uniform increase in clamping height should be used.
7. Attachment mold combination It is recommended to add similar or other components to each side of the mold. With 8 or equivalent fastening devices, the strength is at least twice the strength of the mold fastening system. It is recommended to achieve a double strength factor because the outer fastening device is subjected to most of the load and the inner fastening device acts as an insurance or backup system. Under ideal conditions, a permanent similar add-on that can be used for any constrained positioning is needed. This is usually very difficult. Because it interferes with parts or scrap. In some cases, the constraint can be provided by soldering. A deep beveled V-groove is provided to allow the weld filler to completely melt in the thickness direction. Pre-treating to ensure that it is properly welded in and around the thermal effect zone. Safety standards and mold design standards require additional protection with a screw that has essentially the same strength as the parent metal after welding. It is recommended to refer to the American Welding Association (AWS) standards.
8. Placement of solder joints of analogs deviates from analogs. It will not be placed on the T-slot. The slotted analog is wider to provide constrained positioning and to expand the load bearing area of ​​the T-slot. The main purpose of the pressure mold fastening method is safety and insurance. What is actually done is part of the mold design standard or the safety rules of each workshop. In some cases, the government and insurance agencies may clearly state certain mold structure standards and the correct minimum mold fastening requirements. Current parts and mold designs often do not consider the relationship between mold attachments and T-slots, primarily considering effective material utilization and economics of the mold structure, especially for progressive molds. If the designer neglects the placement of a particular accessory, the mold library that has been prepared must be retrofitted as required after the mold is manufactured.
Nine, to avoid accidents The failure of mold fastening will cause the mold and stamping parts to fly out of the press shop. The mold designer must clearly state the design of the safe fastening mold. Management must ensure the use of mold safety programs.
Uvb Grow Light,2 Pins Uv Lamp,Uv Germicidal Lamps ,Germicidal Uv Lamps
Foshan Kingrate Optoelectronic Technology Co., Ltd. , https://www.kingrateuv.com