With knowledge of various materials, it is proposed to use the / machine tool electrical circuit wiring processing process code "to guide production, to the boundaries of the development and inspection of qualified or not and easy to ignore several issues.
The diversity of the process should be considered. The key features of manual production in the process are easy to produce randomness and blindness. The reference standard defines the scientific meaning of the process, and correctly understands the contents specified in the process. The electrical circuit wiring processing technology code should pay attention to the following problems: 2.1 wiring processing technology * I am manufacturing the machine tool 1 circuit auxiliary materials, the correct application should directly affect the auxiliary circuit wiring plus bookmark1 in the machine tool electrical equipment, With the upgrading of product technology and the updating of national standards, enterprises should make continuous revisions when formulating enterprise standards for machine tool electrical circuit wiring processing codes. According to statistics, the failure rate of machine tool equipment and the quality of electrical circuit wiring processing technology account for more than 40%, indicating that the standardization, rationality and scientificity of the “Code of Practice for Machine Tool Electrical Circuit Wiring†are of great significance for improving product quality.
1 The standard manufacturing enterprises that should be cited have weak management foundation, lack of standardized staff training, lack of information resource system accumulation and statistics. When formulating enterprise standards, new technical parameter indicators are not quoted, resulting in low processing technology level.
Therefore, in the preparation of the "Code of Practice for Machine Tool Electrical Circuit Wiring", it should be carried out in accordance with national standards or industry standards. The standards to be followed in 1992 are the identification of electrical equipment terminals and specific wire ends and the application of the alphanumeric system. GB/T1408. 1-2(1)0 General rules for low-voltage switchgear and control equipment. DL/T720-2000 circuit system relay protection cabinet screen general technical conditions. GBX81-1981 Electrical wiring in the complete set of electrical equipment. JB/T56189-1994 Low-voltage extraction type switchgear product quality grading. JB/T561890-1994 Low-voltage fixed panel type switchgear product quality grading. GB7251. 1-1997 Low-voltage switchgear and control equipment Part I, type test and partial type test equipment. GB16179-1996 safe use standard. GB2984-1996 safety sign. GB/T13534-1992 code for electrical color marking. JB/T8456-1996 Low-voltage DC complete switchgear. JB/T2463-1992 copper wire crimped end. JB/T8457-1996 General requirements and test methods for cold extrusion crimping tongs. For the replaced and abolished standards, attention should be paid to the announcement issued by the State Bureau of Technical Supervision for revision.
2 Precautions for the preparation of the “Code of Practice for Machine Tool Electrical Circuit Wiring Wiring†When preparing the “Machine Electrical Circuit Circuit Wiring Processâ€, most of the processing techniques use the line method, the strapping method, the line method and the strapping. The method uses three methods. In the three methods, the rated insulation current of the insulated wire is relatively important, but the allowable working temperature mechanical strength of the insulated wire, electromagnetic compatibility, and color under certain conditions are often neglected.
2.1.1 Insulated wire color. The color of the insulated wire is not only used as a kind of mark, indicating different phase sequence or some use function. It should be quoted. Some enterprises have unclear concept of safety ground wire (yellow-green two-color line), and the power supply is connected to zero and lost. The importance of security.
2.1.2 The safe distance of the insulated wire to the heating element. The safety distance of the insulated wire to the heating element is not clear by many enterprises. The heating element generally refers to the component with heating power greater than 7.5W. The provisions are as shown in Table 1. The safety distance between the insulated wire and the heating element is listed in Table 1. Power / W above and below the left and right 3 insulated wires are electromagnetic compatible. With the intelligent system of machine tools, remote sensing, remote signaling, telemetry, remote adjustment, and remote communication, more and more applications in machine tools have become more and more obvious. The problem of electromagnetic compatibility of insulated wires is becoming more and more prominent. Limited to general insulated wires, shielded wires are also widely used, which should also be clearly defined: (1) high-current power lines cannot be bundled with low-frequency signal lines; (2) high-frequency without shielding measures The signal shall not be bundled with other wires; (3) the signal lines of the high level and the low level shall not be bundled together, nor shall they be bundled with other wires; (4) the high level signal input line output line shall not be bundled at (5) The DC main circuit line shall not be bundled with the low-level signal line; (6) The main circuit line shall not be bundled with the signal electric screen line.
2.2 The correct application of the auxiliary materials, the quality of the process, and many manufacturers in this regard did not know and was ignored, here are just a few examples of the application of auxiliary materials.
2.2.1 Cold crimping end. Cold crimping ends are divided into OT type and UT type, which are mostly used for multi-strand crimping. The model meaning is as shown.
The surface coating of the crimping material should be selected according to the corresponding working environment.
Such as: under normal environmental conditions: copper tin plating on the surface of the material; and high temperature corrosion environment: copper plating on the surface of the material; <20TC high temperature wire insulation layer, polychloropropylene insulation; < 25TC high temperature wire insulation layer, PTFE insulation.
The fill factor of the G wire after it has penetrated the crimped end should be greater than 50%. Below this value, the bushing should be filled. 2 The depth of the embossing at the time of crimping is not less than 0.15 mm, but it should not be too large to avoid connection damage.
3 When crimping, the jaws of the corresponding crimping pliers should be selected. 4 Five-connector mass number verification method, visual inspection of the indentation is clearly visible by means of a 5x magnifying glass. On the axis of the wire and the crimping end, the wire protrudes from the crimping joint sleeve 0.52.5mm, the insulating layer and the crimping end sleeve The tube has a transition gap of 0.5 1.0 mm. The crimping joint should be tested.
2.2.2 tubular cold crimping end. The tubular cold crimping end is used for crimping after multiple strands of wire stripping to prevent contact failure due to the scattering of multiple strands when electrical connection is achieved.
2.3 Requirements for wiring method 1 In the wiring process, the various types of wires are bundled into a bundle shape called a wire harness, and the distance between the bundles of the bundles is uniform, and the relationship between the distance between the bundles and the diameter of the bundle is shown in the table. 2 Table 2 wire harness specified items harness diameter D / mm strap length L / mm line buckle pitch L / mm harness more than 30 wires, allow a spare wire, both ends should have corresponding marking, marking Use the back insertion method to prevent falling off.
When the harness crosses the movable door, the number of harnesses should not exceed 30. When more than 30, the bundle should be separated.
The installation of the 2-row trunking and the wires are arranged in the trunking.
The electrical components should be arranged and arranged in a uniform manner with the line trunking. The overall concept and the components are horizontally and vertically symmetrical. The principle of the layout of the line is that the upper and lower parts of each component of the electrical components are placed on both sides of the overall distribution board. Install the line slot. If the panel surface is too wide, install a longitudinal line slot in the middle of the panel according to the actual situation. According to the thickness of the wire and the number of the roots, select the appropriate line groove; after the wire is arranged, the groove body should not be deformed, the wire should be stretched in the groove body, do not cross each other, allow the wire to have a certain degree of curvature, can not be bundled, can not affect the upper groove cover .
2.4 Machine tool electrical circuit wiring processing technology and cabinet machine tool equipment have many enterprises, the electrical design and the cabinet structure, machine tool structure design is separated, resulting in the cabinet structure design does not meet the electrical circuit wiring processing technology, space is too small, electrical appliances The component mounting clearance is too small to meet the standard heat dissipation requirements. The electrical circuit wiring must meet the requirements of the processing technology and the wiring is convenient. This requires the cabinet structure design and machine tool structure design to be considered from various aspects. The unification of various processes and the ease of implementation are not only the concrete manifestation of the standardization of the standardization, but also the comprehensive consideration of the mechatronics of the overall product reliability.
2.5 Specific requirements for process inspection Many companies use visual judgment methods when inspecting the machining process of machine tool electrical circuit wiring. When making factory tests, it is considered that the line is energized in accordance with the electrical design principle, so it is difficult to cover up. Awareness of the craft problem.
In this regard, the specific requirements for inspection should be put forward for the process inspection: (1) The wire connection should have sufficient mechanical strength. (2) The circuit that realizes the electrical connection shall meet the wiring diagram design requirements. (3) The grounding resistance after electrical connection should meet the technical requirements, generally should not be greater than 10L8. (4) The electrical clearance and creepage distance after electrical connection should meet the requirements of GB/T14048. 1-2000. (5) After the wires are connected, under the standard test conditions, the conductive part of the circuit between the different circuits and the ground (metal casing) shall be able to withstand the voltage value of the AC power frequency withstand voltage test, and there shall be no breakdown flash circuit when the test voltage is 1 min. Phenomenon (see Table 3). (6) After the electrical connection is made, the insulation voltage between the conductive part and the surface 3 conductor and the rated voltage of the test voltage is called /V (metal casing), the insulation resistance between the electrical circuits should be not less than 30L8, and the humidity test is 2 cycles. The insulation resistance after (48h) should not be less than 3L8. (7) When inspected according to this process, some test data can be periodically sampled and tested as the basis for pass and fail in the process data. (8) In the case of visual inspection, according to this process, short-term corrections that do not meet the requirements of this process. (9) On-site inspection with test equipment, if there is any failure, it should be corrected in the short term. (10) Other factors affecting the performance of this process are not covered by this process.
3 Conclusion The machine tool electrical circuit wiring processing technology refers to the process of using the insulated wires, connectors, wiring accessories, etc. in the production process of machine tools, so that the relevant circuits can be electrically connected, so that the process of circuit communication, with national and industry standards Constantly updated, with the improvement of the level of electrical technology, in the judgment of ''the machine tool electrical circuit wiring processing code", it is not only the embodiment of the general concept of wiring, not just the more abstract reference country or industry The general provisions of the standard, but should be more systematic than the electrical principle and the application of various materials, can fully design the keyway parts, determine the number of outer surfaces is 1, the number of inner surfaces is 1. According to the SnartGode system, a 17-digit code part code is generated, wherein the auxiliary feature of the external tooth surface is a tooth shape, and the auxiliary feature of the inner surface is a key groove, wherein 14 bits are fixed coded holes of the part = (), The fifth digit is the coded bit of the end face of the part, and the 611th bit represents the various spur gear feature coded bits of the part shape (outer circle surface). The seventh bit represents the tooth profile, 121 The 7-bit indicates the various feature coded bits of the part shape (the surface of the hole). The 13th bit indicates the keyway.
1.2.3 SmartCode system information sorting rules According to the above analysis of the coding structure and identification method of the SmartCode system, the author designed various code bit classification tables according to the following principles.
In the process design of the part, firstly, according to the part code generated by the SmartCode system, each code point is identified according to a certain order and rules, and the process file is extracted from the composite process of the part family, and then deleted and edited to obtain a reasonable process file. JB/T8456-1996 low-voltage DC complete switchgear.
12JB/T2463-1992 copper wire crimped end.
1996 General requirements and test methods for cold extrusion crimping pliers
(Finish)
neumatic Counterbalanced Valve,Balanced Control Valve,Hydraulic Balanced Valve, Balanced Bellows Valve
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