Die-casting enterprises should know how to manage die-casting dies well.
Release time：2019/6/4 1:03:28 | Source of information：Dongguan zhongding precision mould co. LTD
Dongguan Zhongding Precision Die Co., Ltd. is an enterprise specializing in the design and production of zinc alloy die-casting dies, aluminum alloy die-casting dies, magnesium alloy die-casting dies and die-casting products processing. It provides one-stop service from materials, dies, die-casting, post-processing and surface treatment. Provide professional die casting die and product processing services for many top 500 enterprises in the world. Under high pressure, filling liquid or semi-liquid metal into die-casting die cavity at high speed and rapid solidification under pressure is a method to obtain castings. Die casting die is easy to be damaged by molten metal because of the impact of high temperature, high pressure and high speed liquid metal. Because of the design of die structure, it has a great influence on the efficiency of die casting production, the appearance quality of castings, dimensional stability and so on. It can be seen that the quality of die castings and the die factors are inseparable. Following is a brief discussion on the management of die casting die.
I. Management of Aluminum Alloy Die Casting Die before Manufacturing
Since the quality of aluminium alloy die-casting die has a great impact on the quality of subsequent die-casting parts, a die-casting workshop must trace the quality management of die-casting die back to the beginning of the production of die-casting die, and do a good job of communication with die-casting die manufacturers from design, material selection, production process to specific details.
1. Summarize the problems of the original die
In production practice, the designers of die-casting products do not necessarily have a deep understanding and grasp of the production process of die-casting. Sometimes there are some unreasonable aspects in the design of the die-casting products we need to produce. Seriously, it will affect the normal production of castings, resulting in the decline of the rate of good products, the reduction of class output, and frequent maintenance of dies and other issues. These problems are often reflected after the first production of the die, so the management of die casting die needs to summarize these problems and improve the second replication die.
2. Full communication with mould factory
In die casting production, most of the products need to repeat the production of the mold. For the replication mold, because a pair of molds have been used, there will be problems and shortcomings in the use of the mold, of course, there will also be design highlights. Then, as a die-casting enterprise, it has the responsibility and obligation to communicate these problems of the original mould with the mould factory as detailed as possible, remind them of some details in the design of the mould and stipulate the detailed technical requirements of the mould. Only in this way can the quality of the newly produced mould be improved, which is the only way to improve the quality of the die-casting parts.
3. Unify spare parts specifications to reduce waste
Die-casting die parts are indispensable in the use of each die-casting die. With the end of the life of a die, a large number of die parts will be scrapped. In order to reduce the loss in this respect, the unified specification of die core should be considered at the beginning of die-casting die design, which includes: the unification of moving die and fixed die core, the duplication of die and old die core. Unification, the unification between similar moulds, etc. When designing dies, considering these problems as a whole can greatly reduce the type and quantity of spare parts in normal production and reduce the cost of using dies.
II. Acceptance of Die Casting Die
The acceptance of die-casting die is to check whether the die-casting die manufactured by the die-casting factory meets the mould technical requirements signed by both sides. If there are some defects in the design and manufacture of a set of dies, it will inevitably bring hidden dangers such as quality and safety for the follow-up normal production. Therefore, only the die-casting dies which have passed the acceptance and reached the qualified standards can ensure the normal production and the quality of products be guaranteed.
1. Acceptance and Acceptance of Die Safety
(1) The stroke switch under the mould needs waterproof treatment.
(2) The thread accuracy of the reset hole should be checked first. Once the thread is released in use, it is easy to cause die collision.
(3) The size and accuracy of the cylinder connection threads must meet the design requirements.
(4) Mould hoisting holes must be balanced, and thread of hoisting holes can reach design accuracy.
(5) Mould slider limit spring adjustment should be appropriate.
2. Acceptance and acceptance of mould making
(1) Cooling water should be unblocked, no leakage should be allowed, and the intake and outlet should be marked clearly.
(2) Die materials and heat treatment data meet the requirements.
(3) The parting surface should be well matched and the splash of liquid aluminium should not occur.
(4) The roughness of the cavity and runner should meet the technical requirements, and no machined cutter marks or electro-machined marks should appear.
(5) Ejector clearance, slider clearance and guide pillar clearance should be reasonable; slider movement should be stable; slider and wedge should be compacted after clamping; contact area should not be less than three-quarters; limit position should be reliable after opening; and splash phenomenon of liquid aluminium should not occur in sliding parts.
3. Acceptance and Acceptance of Die Formability
(1) Whether there is any appearance defect in the product.
(2) Whether the ejection is deformed (including ejection marks, local flatness, ejection cracking, etc.).
(3) Whether it can meet the following surface treatment requirements.
(4) Whether the air tightness requirement is up to the standard.
4. Dimension Acceptance of Die Castings
(1) Full-scale inspection of castings.
(2) Processing trial production according to process.
(3) Trial assembly with other parts to be assembled.
(4) Check and record the actual machining allowance of each part.
Through the inspection of the above aspects, we can basically confirm the design and manufacture quality of a set of dies and meet the requirements of the dies.
Person：Mr Ye