Foreword
Standards are the basis for research, design, production, inspection and marketing. There is no standard, the language of enterprises has no language. More than two thousand years ago, Mozi said that "the hundred workers are the ones who are the ones, the rules are round, the straight ones are strong, the hanging is over. So the hundred workers change." This is what is called "a hundred workers", that is, all walks of life engaged in manufacturing today, "钜", "regulations" and "laws" are today's standards.
One of the major industries in the foundry industry, China has a large number of foundry and mold production enterprises, and it is not difficult to imagine the demand for the standard. At the same time, many casting companies now have to build their own international standards and standards of some industrial countries. This is because China has joined the WTO. Products in the foundry and mold industries do not have domestic demand, but in the face of the international market, companies that produce and export castings and prepare to produce export castings are in great need of international standards. Even though the casting blanks are currently only produced for domestic use, the final products of many domestic enterprises are for export, based on domestic or foreign standards. But so far, China has not yet developed a more comprehensive and practical standard for casting molds for casting molds. The compilation of books has at least two or three million words. It is really a grand view, a huge volume, and a look. On the contrary, many inconveniences. If the main technical content of the foundry mold standard is extracted, it will be helpful for the enterprise to accurately and easily compile the manual for easy application. For this reason, the author has been engaged in the casting mold and inspection for many years. The internal correlation standards of some sand mold companies collected are introduced to everyone, in order to make everyone look like design, manufacture, inspection three parts for the peers to explore and reference.
First, the design reference standard
1.1 The technical conditions for casting wood and core box should refer to JB/T7699-95 standard.
1.2 The process deviation, core size and casting machining allowance are not indicated in the process. Refer to JB/T5105 106 and GB/T11350.
1.3 The basic dimensions of the casting mold core should refer to the JB/T5106-91 standard.
1.4 Casting pattern, draft angle, should be compared with JB/T5105-91.
1.5 The tolerance of the unfilled position should refer to the accuracy requirements of 6~7 in (GB1182-80).
1.6 The casting alloy shrinkage of the sample is referred to the JB4022-85 standard.
1.7 The machining allowance of castings shall be in accordance with GB/T11350-89 standard and GB6414 "casting dimensional tolerance";
1.8 Material: Wood: GB1511 and GB1532, GB4817.1 and GB4817.2.
Second, processing and manufacturing standards
Reference should be made to Table 3-X in the "General Catalogue of Machinery Industry Compilation" and "Manufacturing Manual for Mechanical Manufacturing Process Technology".
2 . 1 The code of manufacture for wood molds and metal molds shall be in accordance with the relevant standards established by the Machine Tool Industry Bureau of the Ministry of Machinery Industry;
2 . 2 The blank of the mold blank shall comply with: ( JB.Z307.12—88 )
2 . 3 The general rule of practice for fitters plus clamps (JB/Z307.13-88)
2 . 4 Turning processing should comply with: General Code of Practice for Turning (JB/Z307.12-88)
2 . 5 Milling should be in accordance with: General Code of Practice for Milling (JB/Z307.13—88)
2 . 6 Molding process cards shall comply with Table 3-37
2 . 7 Sand casting process analysis sheet should meet Table 38
2 . 8 fitter assembly should refer to: (JB/T599-92) assembly general technical standards
Third, the inspection and acceptance of relevant standards
In addition to the above design and manufacturing standards, the quality grade standards of casting molds shall also refer to the quality grade standards of the model workers in the wood molds and metal molds.
3 . 1 The surface roughness of the casting mold should conform to: Wood mold: GB/14495 Wood roughness sample: Metal mold 85 Machined roughness surface comparison sample.
Visually or tactilely compare the working surface of the test pattern and the core box with the above two samples.
3 . 2 Mold equipment should refer to; JB/T5994-97.
3 . 3 Mold verification requirements should be in accordance with JB/Z283.5.
3 . 4 mold operation instructions book should conform to JB/Z187
3 . 5 The accuracy requirements of the inspection and gage related standards shall comply with the requirements of Table 1.
Fourth, the conclusion
Through the trial of the above internal reference standards in the enterprise for several years, the pace of new product development has been accelerated, the product quality has been shortened, the production cycle has been shortened, and the responsibility has been clarified, which has reduced the mutual refusal of the casting mold in the trial production process. The company has reduced the investment cost of tooling molds in the process of new product development. It can be seen that the standard of foundry molds will have a positive significance in improving the competitiveness of production enterprises, and will have a far-reaching impact.
Hydraulic Full-Automatic Decoiler,Automatic Decoiler,Hydraulic Full-Automatic Uncoiler
Willing International Co., Ltd. , http://www.hz-rollformingmachine.com