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  • About the treatment of products yellowing and blackening (Internet download)
    April 14,2021.

    About the treatment of products yellowing and blackening (Internet download)

    All the time, the aluminum alloy die casting cleaning is always a difficult problem. The practice of many enterprises is, after machining, do not do thorough cleaning, just use water to simply rinse, then blow dry, or even natural air dry, and then stacked in the warehouse for a few months.Suddenly one day need to be out of the warehouse, only to find the work piece long mildew spot, moldy, black, yellow situation. At this time, we suggest you: 1, with die-casting aluminum mildew spot cleaning agent timely and thoroughly clean, including the surface of the work piece oil, slight oxidation mildew point (mildew point is still very small, do not look carefully, the naked eye can not really see); 2, after cleaning, immediately do an anti-oxidation treatment. It should be noted that currently chromic acid has been banned, the use of chromium and cyanogen free passivant to meet the environmental requirements; 3. After anti-oxidation drying, the workpiece shall be placed in a dry and ventilated place and inspected regularly. 二、Fragile workpiece Item Replacement time Remark Ejection rod At any time Deformation, fracture, fluff, abnormal sound Cast pin At any time Deformation, fracture Irregularly shaped insert At any time Deformation, fracture Seal ring At any time Leaks, breaks, expiration date Rubber tube At any time Leaks, breaks, expiration date   Replacement time 1、Vulnerable workpiece according to the mold production product strain, deformation, fracture, uneven or mold production abnormal sound failure, please replace at any time 2、If it is damaged during assembly or production, please replace the required workpiece at any time.
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  • About the processing of flying material and adhesive mold on parting surface of mold
    April 14,2021.

    About the processing of flying material and adhesive mold on parting surface of mold

    The mold is composed of moving mold and fixed mold. Parting surface refers to the part that can be contacted when the two are closed.According to the requirements of mold production, the parting surface of the moving and fixed mold core should be 0.15-0.35mm higher than the parting surface of the mold frame (mold frame) to prevent the parting surface from flying materials. 1.It is generally more machine problems that new mold parting surface large area and local parts of the problem of flying material a.Clamping force is small and not locked in place.(empty lock for many times, check the locking strength) b.Is the supercharging pressure too high?Is the trip too short? c.Whether the holding time is too short. d.Is it too warm? (normal position 660° ~ 680°) e.Check die casting machine for wear of curved core (curved arm) or bushing.Is the gap too large? f.Whether the machine wall is balanced 2.The mold will also have problems. a.The mold is not in place. (apply red powder to the smooth and easy to check parting surface of the moving mold core, and (generally apply it to the parting surface of the mold core) after the mold locking, check whether the red powder traces of the parting material surface not applied reach the production requirements of 95% or more. b.Die core exhaust location smaller, shorter or deeper (-0.15mm or more), easy to fly 3.Mass production (more than 25,000 times) of mold parting surface flying material (old mold) a.Check whether the flying material position of parting surface is collapsed, the exhaust groove is too deep or there are foreign matters, such as aluminum slag is not cleaned, so that the mold can not close in place to produce flying material. b.Check whether the height of mold frame (mold frame) and mold core parting surface is in place. The normal closing die is: the upper and lower parting surface of the die core meets each other, and the upper and lower parting surface of the die frame has a gap of 0.3-0.7mm. Long time production products mold deformation, die box around the edge of the upper and lower parting surface hit dead or obviously adhere to foreign bodies, so that the mold core upper and lower parting surface can not touch, can not match to the effective position, resulting in the gap will have flying edge, flying phenomenon.
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  • Use of mold cooling system
    April 14,2021.

    Use of mold cooling system

    1.When used correctly, the cooling system can prolong the service life of the mold and improve its production efficiency.In the actual production we often ignore its importance, production operators in order to save time, also do not go to the cooling water pipe.Some companies even in order to save the cost of custom mold even do not need cooling water, resulting in a very serious shutdown.The material of the mold is generally special mold steel, is made after a variety of processing.But even the best materials have their limits.If the mold temperature is too high in the production, it is easy to make the mold core surface early turtle crack, some molds have not even produced more than 2000 mold cracks on a large area.Even in the production of the mold, because the mold temperature is too high, the mold core has changed color, and even reached more than 400 degrees after the measurement, such a high temperature and spray release agent chilling will make the mold large area cracking or serious cracking, casting is easy to deformation, strain, adhesion or scrap. 2.Under the condition of using cooling water system (water or oil), the mould can greatly reduce the dosage of release agent and shorten the long spraying process.Its advantage is to save the die casting production cycle, improve the quality of products, reduce production stop-production failure and die damage events caused by mold cracking or casting strain, aluminum sticking and mold sticking.It also reduces the loss of ejector rod, casting pin and mold core caused by the overheated mold temperature, and effectively prolongs the production life and production quantity of the mold. 3.Pay special attention to the use of cooling water system caused by the cooling pipe blockage, to check frequently.
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  • Instruction after the operation of mold
    April 14,2021.

    Instruction after the operation of mold

    When temporary shutdown is required, the mold should be closed so that the cavity and core are not exposed to prevent accidental damage.Downtime is expected to be more than 24 hours, in the cavity, core surface should be anti-rust treatment, especially in the wet area and rainy season, even a short time to do anti-rust treatment.Because the moisture in the air will make the surface quality of the product quality.When the mold is used again, the grease spots on the mold should be removed and cleaned before use. When the production quantity of the mold has been completed and other molds need to be replaced, the following work shall be completed before the machine is shut down: 1.Turn off the cooling water first 2.Blow the excess water in the water channel of the mold 3.The oil in the cylinder used for core pulling should be emptied as far as possible and the oil nozzle should be sealed to avoid leakage of hydraulic oil or pollution of the surrounding environment during storage and transportation. 4.All moving parts, parting surface residual aluminum slag products or other foreign bodies must be removed clean, clean and on the product part, each moving parts, parting surface oil protection or spray anti-rust agent. 5.Fill in the relevant records truthfully, send the accessories of the mold to the maintainer, and attach the qualified products of the last mold to the inspector as samples
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  • Li Jun, Gai Yanbo, Cao Kai and other experts visited Longhua in Bengbu to inspect the progress of the cooperation project between the institute and enterprises.
    March 19,2021.

    Li Jun, Gai Yanbo, Cao Kai and other experts visited Longhua in Bengbu to inspect the progress of the cooperation project between the institute and enterprises.

    On March 17, Li jun, the municipal government deputy secretary-general and director of Bengbu Center, Caokai,one engineer of the intelligent mechanical department of Chinese Academy of Sciences institute in Hefei, conduct research and communication in the factory of the bengbu longhua die casting machine co., LTD.. The communication focused on the progress of the "high-speed and high -precision die-casting machine system " (this project was signed with Chinese Academy of Sciences, hefei institute in  the third China MEMS intelligent sensor industry development conference in 2019) At the meeting, Zhou Wenping, Head of the enterprise, said that after the research and development of Cao's engineer team, the die casting molding rate has been improved from 70.1% to 100%, and the operation was also more simple and more humane. Longhua has nine authorized invention patents. At present, its die casting machines has been exported to Russia, India, Pakistan, Vietnam, Turkey, Azerbaijan, Bolivia, Morocco and other countries, and it has won the unanimous praise of customers at home and abroad,. The sales volume of the products has also reached more than ten millions. Cao said that the second phase of the project began before Spring Festival , and the progress of the project is ahead of schedule. The two sides are now in negotiations on a new project "to replace the traditional Connecting rod manipulator with a robot.". Li stressed that Bengbu Center would fully support the upgrading and transformation of traditional manufacturing industry, what's more, encourage enterprises to cooperate with the Institute for scientific and technological innovation canter, to focus on the development opportunities and set up a long-term vision. While tracking and supervising the progress of the approved projects, the Center should also actively connect with new projects to help enterprises grow stronger and larger with the best quality services. Review of the signing ceremony between Bengbu Longhua and Hefei Institute of Chinese Academy of Sciences Production and research base site Invention patents (two of which were developed in cooperation with Hefei Institute of Chinese Academy of Sciences) "The mighty pass is like iron, and now I have crossed it from the beginning." "Let the world fall in love with Made in China"
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  • Nitrogen pressure requirements for die-casting machines
    March 16,2021.

    Nitrogen pressure requirements for die-casting machines

    (1) Within three days of the actual operation of the die casting machine, be sure to pay attention to check whether there is nitrogen leakage, so as to prevent the equipment from being damaged in the nitrogen bottle during transportation. (2)One week after the actual operation, the first inspection will be conducted. From then on, the inspection will be conducted once a week and then every two months. In case of insufficient pressure, nitrogen should be added in time. (3)Ways of examining the nitrogen pressure are as follows: close the operation of motor, stop switch calibration, open the pressure relief valve, at the same time, observe the hydraulic pressure of booster oil and 2 speed hydraulic pressure , when the oil pressure falls to zero, the two groups of accumulator nitrogen pressure value equal to the pressure accumulator nitrogen pressure and fast injection accumulator nitrogen pressure .The nitrogen pressure must conform to the standard value in the user manual.
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  • Reference for die casting process debugging

    Reference for die casting process debugging

    The purpose of focusing on weight as a reference element is to focus on the concept of compactness.The degree of compactness is different under different conditions, so we need to look at this point reasonably. Generally speaking, if the surface of thin - walled castings is to be done well, the injection velocity must be fast. Thick wall surface to do well, the process of shooting must be strong. Thin - walled surface to do a good job, the injection rate of the conventional machine is basically ok.For thick wall parts that require both surface and compactness, in addition to fast shooting speed, it is also necessary to ensure the inner compactness of the casting. During die-casting, after the explosive power of the two-speed nitrogen cylinder, the pressure supplement of the conventional machine may be insufficient. In fact, speed and force are inversely proportional, like a car, low gear, the force is the largest, high gear force is not strong.Therefore, for thick wall parts with required surface, if there is a force supplement in the forming process, it can be better to assist the force this element, powerful and speed, compactness will be better. Combined with the actual situation of die-casting, the relationship between force and speed, the engineer added the supercharging action to the machine to make the machine have this characteristic.Of course, reasonable excellent mold is the main part of improving the product excellent rate, the machine and skilled operators play an important auxiliary role. The concept of force and speed for castings with different thickness and thin wall is clear, and the good standard of castings can be treated reasonably if the key points of each process are properly applied. The sprue sand hole of thick wall products is usually caused by shrinkage hole caused by too high mold temperature. Under the condition that mold temperature control is not ideal enough, if the follow-up supplementary force is enough, it can make up for the sand hole to some extent.
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  • Matters needing attention in mold production

    Matters needing attention in mold production

    Matters needing attention in mold production Before mold production, die caster should pay attention to the following requirements: 1.In the cold mold state or in the shift, or the machine is not normal production and other circumstances, you must re-adjust the switch, and the two block and pressurized off. So as not to cross the machine or damage the mold. 2.The handles, slag bags and wastes in the residual castings must be heated and dried on the furnace before adding the crucible to prevent spatter and injury. 3.Before the machine is opened, it must be started by inching, and start the machine under the condition of ensuring no abnormality of the machine. No abnormal conditions include: normal temperature of hydraulic oil, lubricating oil, and open cooling water. 4.It is strictly prohibited to adjust the opening of the machine tool, dismantle or move the safety protection components and devices of the machine tool in the clamping mold state. 5.In the machine tool production process, must avoid the parting surface, in case of channeling aluminum, injury. 6.Power must be turned off when the machine is shut down, and the water inlet valve must be closed when the machine is shut down for a long time. In winter, the water in the cooler must be drained to prevent the cooler from freezing. Before casting production, the mold cavity, core, guide column, guide sleeve, ejector rod, reset rod, mold guide part and sliding part must be thoroughly brushed with oil. If any abnormality is found in the casting production, it should be stopped and checked in time.Pay attention to safe production. In the normal production process, the die caster must execute the correct die casting process requirements: 1.Spray correctly. 2.Brush oil on the relevant sliding parts on the mold. 3.Clean the residual aluminum slag products or any other foreign matter on the parting surface. 4.Control material temperature. 5.Control mold temperature (with mold temperature machine, mold cooling water or spray). 6.Control handle thickness. And according to the product quality, adjust the process in time. In the die casting process, special attention should be paid to the mold cavity, parting surface and exhaust slot of the scum is clean, absolutely no residual aluminum slag or any other foreign matter.Try not to use hard tools such as file when cleaning, in order to avoid damage to the cavity surface, also to prevent mold failure, so please use air pump gun or copper rod tools to work. 1.In case the casting fails to come out or the casting is partially stuck in the cavity of the moving and static model, it is strictly prohibited to use a hard file or a power drill to remove it, so as to avoid damaging the mold and causing production stop-production failure.If there are more than one neutron core on the mold structure (neutron refers to the core moving by external force (oil cylinder connection) in the mold), and the core (pin) has interference with each other, you must be in stric...
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