The aluminum die
casting part production flow chart
Commonly used materials of aluminum die casting: ADC12, ZL101,
ZL102,A380, AlSi9Cu3, AlSi12(Fe);
The precision of the aluminum die casting: ±0.1mm;
Smoothness of surface of rough part: Ra1.6~Ra3.2;
Shrinkage rate of aluminum die casting products: 0.5%;
Material wastage rate: 5%;
General aluminum die-casting machining allowance: 0.5mm~0.7mm;
Surface preparation methods: Sand blasted, Shot blasting, Powder coating,
Painting, Plating, Electrophoresis, Polishing
The
specific pressure parameters of aluminum die casting part
Material
Thickness of die casting parts≤3mm
Thickness of Die Casting Parts>3mm
Simple structure
Complex structure
Simple structure
Complex structure
Aluminum alloy
25-35Mpa
35-45Mpa
45-60Mpa
60-70Mpa
Injection
speed of die cast process
Pouring
liquid metal tie up chamber volume percent
Injection
speed(cm/s)
≤30
30-60
>60
30-40
20-30
10-20
High
speed computing formula
V -------------Cavity
volume (CM3);
N ------------ Cavity No;
D ------------ Die-casting
drift (CM);
T ------------- Proper
filling time.
Holding
pressure time
Material
Thickness
of die casting part<2.5mm
Thickness
of die-casting part>2.5~6mm
Aluminum
alloy
1-2
3-8
Aluminum
die casting mold temperature
Tm ---------------
Aluminum Die Casting Mould required working temperature (℃);
Th -------------- Aluminum
Alloy pouring temperature (℃);
â–³
t---------------The
temperature control of tolerance (The general is 25℃).
The Aluminum Alloy Die Casting production and QC control
Aluminum Alloy Die Casting, Aluminum Pressure Die Casting, High Pressure Aluminum Die Casting, Aluminum Injection Die Casting NINGBO BEILUN LEMA MACHINERY TECHNOLOGY CO.,LTD , http://www.china-lema.com
In order to improve the quality of ancillary products, China National Heavy Duty Special Vehicle Co., Ltd. requires that ingoing parts and accessories not only have a significant improvement in appearance, but also have a qualitative improvement in internal functions, reliability and service life.
First, change thinking and ensure that all employees participate in the quality control system.
The procurement system of China National Heavy Duty Truck Co., Ltd. has changed from being a single-guaranteed product to meet the needs of on-time delivery to the idea of ​​ensuring the availability of qualified ancillary products on schedule. The improvement of the quality of ancillary products requires not only the role of a quality responsibility engineer, but also the completion of the entire process. The staff attaches great importance to the construction of a quality procurement system. Each salesperson must assume a certain amount of quality responsibilities, comprehensively coordinate quality, and require contradictions between the goods cycle. This requires each salesperson to issue a goods delivery plan at the first time and provide the supplier with a sufficient organization cycle. Through understanding the suppliers and predicting product quality risks, it is necessary to timely feedback to quality responsibility engineers to prevent products with quality problems from reaching the factory.
Second, strict implementation of the supporting product quality responsibility engineer system.
First of all, after the failure of the top 50 products for after-sales failures, and the after-sales service center to implement the failure mode of the faulty parts, and after research with the technical department and the supplier, the supplier will be fed back in the form of quality information feedback form, and the supplier will return the old parts if necessary. Analyze and then formulate improvement measures and implementation schedules in the form of 8D reports. The Procurement Department supervises implementation.
The key projects that have been implemented in 2011 are: Hawe truck axles, low-speed tractors and cab cabs, terminal lift cylinders, mining vehicle tires, flexible hoses and clutch cylinders, oil filters, and other issues. After more than half a year, the effect is obvious. 
Analysis and handling of quality problems in storage and production: Purchasing Department resolutely implements the newly launched “First-line Work Lawâ€, and responds quickly in various aspects such as the requirements for goods, storage, assembly, and returns, ensuring timely protection. The quality of resources to complete the task of resource organization. For the quality problems found in the storage and production process, the reasons were analyzed in a timely manner, the supplier was notified on site, and the supplier was interviewed if necessary.
With the gradual deepening of the quality responsibility engineer system, the Purchasing Department has carried out a large number of supporting product quality enhancement work based on quality responsibility engineering. Although the quality of some ancillary products has been significantly improved, but on the overall analysis of the operating status of the quality responsibility engineer system, the quality responsibility engineer currently only optimizes the quality of some products in response to problems that have emerged as ancillary products or the quality improvement plan issued by the quality department. In the later stage, we will focus on strengthening quality responsibility engineers to carry out work in the risk assessment of suppliers' quality system, new product design and selection, including participation in the initial stage of product design and structural analysis and selection of quality assurance under appropriate conditions. Various aspects such as suppliers, etc. Participate in the review and evaluation process of design ability and production capacity for new suppliers at the initial stage of design preparation; participate in the re-supply of suppliers when there is a problem with the supplier's product quality or the supplier quality may be predicted The evaluation and on-site preparation of treatment plans; establish and improve the supplier interview system; irregularly organize the relevant departments to conduct supplier process audits. So far, China National Heavy Duty Truck Corporation has interviewed 11 suppliers, conducted Dongfang Kanghua and Jiangdu Feida Company's supplier production process audits, and conducted a two-way audit of Zhengxing Wheel and Wuhu Shengli Company.
The sound operation of the quality responsibility engineer system requires a large amount of basic data support, which is inseparable from the support and cooperation of the competent business departments. It mainly includes the inbound inspection data of ancillary products, zero-kilometer quality problems, statistics of after-sales service products, follow-up records of quality problems after product improvement, and PPM status and analysis reports of the company's general-purpose manufacturers. The Purchasing Department will work with all business administrations to establish a quick information channel and management procedures as soon as possible.
Third, strengthen the evaluation and selection of suppliers, and realize the harmonization of quality, value and quantity of supplier systems.
The evaluation of suppliers by China National Heavy Duty Truck Group is mainly carried out in two aspects. The first is the organization of the expert group at the end of the year, based on the actual situation of the supplier for one year, from the aspects of quality status, supply performance, enterprise qualification and price level. Comprehensive written evaluation; second is the organization of technical department, quality department experts to visit the scene.
China National Heavy Duty Truck Corporation has two types of suppliers: common parts and special parts. The common parts are selected from one to two suppliers with the best quality, strong supply capacity and good reputation in the Sinotruk supplier system. Business is the supplier. The special parts will be selected as the main supplier of similar products to participate in trial production and production. This will not only satisfy the principle of quality priority, but also ensure resource organization and reduce the risk of the company.
Fourth, earnestly study the requirements of the new procurement procedures of China National Heavy Duty Truck Group Corporation and realize the switch as soon as possible.
After the release of the new procurement management program of CNHTC, stricter standards were imposed on the access of suppliers and new products, and the procurement department re-organized the procurement system documents in accordance with the new procurement procedures. This mainly includes the development of purchasing management procedures and procedures, and the preparation of procurement manuals.
In the new procurement process, higher requirements have been put forward for the cooperation of relevant departments. To ensure that the new procurement process can run quickly and with high quality. In the process of new supplier selection and new product development, drawing is issued, product grading is confirmed, application form of opening point is approved, cooperative development agreement, confidentiality agreement, material release book, technical function release book, production sample release book, new supply The approval of the party's access and the release of ancillary products, etc., require the relevant departments to conscientiously study the new procurement procedures, cooperate fully and provide support for the implementation of the new procurement procedures.
Fifth, improve the quality of work and ensure that orders are delivered on time.
China National Heavy-duty Vehicle Corporation has established a system for reporting abnormalities in the procurement of resource arrivals, and formulated measures for the procurement of resource anomalies, and assigned individuals to implement the progress of each day to ensure that the materials are in a controlled state. The Purchasing Department has established a morning meeting system to summarize and analyze the information of the previous day, formulate countermeasures and implement them.
CNHTC relied on the “Second Venture†platform to strictly control the quality of its ancillary products and optimize its product inventory. Under the premise of strictly implementing the new procurement process of the group company, strict implementation and multiple measures were taken to ensure high procurement. Quality accessory products. 
China National Heavy Duty Truck Enhances the Quality of Special Vehicle Parts and Upgrades Quality of Haowei Mining Vehicles