GB/T 39957-2021High pressure metal die casting units—Technical requirements (English PDF)

1 Scope

This document specifies the technical requirements, operation requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of high pressure metal die casting units.

This document applies to high pressure metal die casting units, including die casting machine and its auxiliary devices, such as heat preservation and pouring device, picking and conveying device, spraying device, mold temperature control device, cleaning and repairing device, inserting device, detection device, system safety device, collection, discharge, dust removal device, vacuum device, marking device, integrated control device, but not limited to the above devices. It applies to low-pressure casting, squeeze casting and other casting units as reference.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 3766, Hydraulic fluid power - General rules and safety requirements for systems and their components

GB/T 5226.1, Electrical safety of machinery - Electrical equipment of machines - Part 1: General requirements

GB/T 7932, Pneumatic fluid power - General rules and safety requirements for systems and their components

GB/T 7935, Hydraulic fluid power - General requirements for hydraulic components

GB/T 9969, General principles for preparation of instructions for use of industrial products

GB 20906, Safety requirements for high pressure metal diecasting units

4 Technical requirements

4.1.6 The working fluid medium of the high pressure metal die casting unit shall meet the requirements of the technical documents; the cleanliness of the hydraulic system of the die casting unit shall meet the requirements of 6.4 in GB/T 31562-2015; the cleanliness code is 22/19.

4.1.7 The regulating valve stem of each control mechanism of the high pressure metal die casting unit shall be flexible, reliable and positioned correctly after assembly.

4.1.8 The safety of the high pressure metal die casting unit shall meet the requirements of GB 20906.

4.1.9 There shall be a safety interlock function between the die casting machine and the picking, spraying, heat preservation and pouring devices, so as to prevent mechanical damage which is caused by malfunction.

4.1.10 In abnormal situations such as power failure, each device shall have a mechanical anti-drop function.

4.1.11 The technical documents that are provided with the high pressure metal die casting unit shall at least include operation instruction manual, certificate of conformity, and packing list. The operation instruction manual shall meet the requirements of GB/T 9969.

5 Idle running requirements

5.7 The time of one empty cycle of the high pressure metal die casting unit shall not be greater than the sum of the shortest cycle time that is specified by the device.

6 Load running requirements

6.1 The high pressure metal die casting unit shall be subjected to an idle running test before load running.

6.2 Under normal operating conditions, carry out the physical die-casting test; during the test, various parameters shall meet the design requirements.

6.3 The action of the movement mechanism of each device shall be flexible, stable, accurate and coordinated.

7 Inspection methods

7.1 The cold chamber die casting machine shall be inspected in compliance with the provisions of GB/T 21269.

7.2 The hot-chamber die casting machine shall be inspected in compliance with the provisions of JB/T 6309.3.

7.3 The spraying device shall be inspected in compliance with the provisions of JB/T 12284.2.

7.4 An empty cycle time shall be tested with a stopwatch; its reading is the time from the start of the high pressure metal die casting unit's mold closing action to the end of the spraying work.

7.5 The noise shall be inspected in accordance with the provisions of GB/T 25371.

7.6 The feeding device shall be inspected in compliance with the provisions of JB/T 11554.2.

7.7 The cleanliness of the hydraulic system of the high pressure metal die casting unit shall be tested in accordance with the provisions of GB/T 31562-2015.

7.8 Determination of the vacuum valve closing response time:

a) Oscilloscope: time scale of 0.000 1 s;

b) Connect the vacuum valve closing signal and the completion signal of the vacuum valve closing action to the oscilloscope; […]