QB/T 1578-1992 Industrial sewing machine GC type lockstitch sewing machine push plate QB/T1578-1992 standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Industrial Sewing Machine
1 Subject Content and Scope of Application
GC Type Lockstitch Sewing Machine Push Plate
QB/T1578--1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of GC type industrial sewing machine push plates.
This standard applies to the push plates of GC type lockstitch sewing machines. Cited standards
Packaging, storage and transportation pictorial marking
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)GB/T 2828
GB/T28291
Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability)GB 5926
GB5930
GB5933
GB5934
GB5938
Test method for appearance quality of metal coatings and chemical treatment layers of light industrial productsTest method for thickness of metal coatings of light industrial productsDrip methodTest method for bonding strength of metal coatings of light industrial productsTest method for hardness of metal coatings of light industrial productsMicrohardness methodTest method for corrosion resistance of metal coatings and chemical treatment layers of light industrial productsNeutral salt spray test (NSS) method
ZBY 17011
3 Product classification
Special thread for sewing machines
Types and sizes are shown in the figure below.
Approved by the Ministry of Light Industry of the People's Republic of China on August 31, 1992272
Implemented on April 1, 1993
4 Technical requirements
4.1 The main dimensions shall comply with the following provisions.
a. Width: 64=0.29mml
b. Length: L=8:mm;
c. Center distance between two screw holes: 23mm
QB/T1578-1992
2-SM 3/32* X56
d. Distance from the center line of the two screw holes to the A surface: mm. 18
4.2 The two screw holes SM3/32\×56 should meet the requirements of the second-level precision of ZBY17011. 4.3 The roughness value of the main surface of the electroplating layer should not be greater than R0.8. 4.4 The corrosion resistance of the electroplating layer should be sprayed continuously for 36 hours, and the corrosion resistance level should not be lower than level 6. 4.5 The thickness of the chrome plating layer should not be less than 0.25um. 4.6 The hardness of the electroplating layer should not be less than 50HV0.05. 4.7 The bonding of the electroplating layer should be firm, and there should be no separation between the key layer and the plated part or the plating layer. 4.8 The surface of the electroplating layer should be smooth, without rust or peeling, and the main surface should have no obvious bubbles, spots, pinholes and burrs, and it should be smooth, flat and basically consistent in color.
4.9 The surface of the plating layer should be flat, without obvious stripes and grooves. 5 Test method
5.1 The dimensions specified in Article 4.1 shall be measured with measuring tools of corresponding accuracy levels. 5.2 The accuracy of the two screw holes is measured by a special screw gauge. 5.3 The roughness of the main surface after electroplating is measured according to the provisions of GB5926. 5.4 The corrosion resistance of the electroplating layer is measured according to the provisions of GB5938. 5.5 The thickness of the chrome plating layer is measured according to the provisions of GB5930. 273
QB/T 1578—1992
5.6 The hardness of the electroplating layer is measured according to the provisions of GB5934. 5.7 The bonding strength is measured according to the provisions of GB5933. 5.8 Article 4.8 Under the light of 600±2001x, the inspection distance is 300mm. 5.9 Article 4.9 is compared with the standard sample.
6 Inspection rulesbzxz.net
6.1 Products can only leave the factory after being inspected by the inspection department and accompanied by the inspection certificate. 6.2 Inspection classification
6.2.1 Factory inspection
The factory inspection items specified in Table 1 of this standard shall be carried out within the period specified in the order contract. 6.2.2 Type inspection
The inspection items specified in Table 1 shall be carried out every six months for products in normal production. 6.3 The classification of unqualified products shall be divided into two categories, B and C, in accordance with the provisions of GB/T2828. The classification of unqualified products for each inspection item shall comply with the provisions of Table 1.
6.4 Inspection method
6.4.1 Factory inspection method
6.4.1.1 Factory inspection shall be carried out in accordance with the normal sampling plan specified in GB/T2828. The inspection level and qualified quality level shall comply with the provisions of Table 1 of this standard.
6.4.1.2 Sample extraction
The samples for batch inspection shall be randomly extracted from the inspection batches sent for inspection. 6.4.1.3 Determination of the quality of a single product
Inspection items
Appearance quality of electroplating layer
Thickness of chrome plating layer
Hardness of electroplating layer
Bonding strength of electroplating layer
Center distance between two screw holes 23mm
Distance between the center line of two screw holes and surface A
Accuracy of two screw holes
Main surface roughness after electroplating
Corrosion resistance of electroplating layer||t t||Main surface flatness
Inspection classification
Article number
Factory inspection
Factory type technical requirements Test method Inspection level V
Qualified quality
Quality level
Unqualified
Type inspection
Discrimination level
Unqualified
Quality level
The quality of a single product shall be determined according to the grouping provisions of Table 2. If one or more Class B items are found to be unqualified, the product shall be judged to be unqualified. Class C items shall not be judged in a single product, but shall be calculated according to the total number of unqualified items accumulated in all samples and judged in the product batch quality. Class B items in Groups 1 and 2 shall be counted according to the number of unqualified products, and Class C items in Group 3 shall be counted according to the number of unqualified items. 6.4.1.4 Determination of product batch quality
QB/T 1578—1992
After all samples are inspected, the batch size and batch quality determination group specified in Table 2 shall be used for determination. If the number of unqualified products in each group in the sample is less than or equal to the qualified determination number A., ​​the batch of products shall be deemed qualified; if the number of unqualified products in any group is greater than or equal to the unqualified determination number R., the batch of products shall be deemed unqualified.
Batch range
151~280
281～500
501～1200
1201~3200
3201~10000
10001～35000
6.4.2 Type inspection method
6.4.2.1 The inspection items shall be all the technical requirements specified in this standard. Regular inspections shall be conducted according to the one-time sampling plan specified in GB/T 2829. The discrimination level and the unqualified quality level shall comply with the provisions of Table 1. 6.4.2.2 Sample extraction
The samples for inspection shall be extracted from the qualified batches or several batches of batches inspected one by one. The sample size shall be specified in Table 3. 6.4.2.3 Determination of the quality of a single product
It shall be conducted according to the method specified in Article 6.4.1.3 of this standard. 6.4.2.4 Determination of product type inspection
After the unit product quality is determined, the inspection shall be conducted according to the inspection sample size and determination group specified in Table 3. If the number of unqualified products in each group of the sample inspection results is less than or equal to the qualified determination number A., ​​the type inspection is qualified; if the number of unqualified products in any group is greater than or equal to the unqualified determination number R., the type inspection is judged to be unqualified.
6.5 The inspection batch judged as unqualified shall be fully inspected by the manufacturer, and after removing the unqualified products, the batch shall be reassembled for inspection. When submitting for re-inspection, the re-inspection record shall be attached. If the re-inspected batch is still judged as unqualified, the batch of products shall not be accepted again. 6.6 In the inspection batch judged as qualified, the unqualified products found in the inspection shall be repaired to qualified products, or replaced with similar qualified products. 7 Marking, packaging, transportation, storage
7.1 The outer packaging shall be marked with:
a. Product model, name, quantity;
b. Supply number, article number;
c. Box size;
d. Net weight, gross weight:
e. Manufacturer name, date of manufacture.
7.2 The storage and transportation graphic signs shall comply with the provisions of GB191. One box, apply 101 anti-rust oil and seal the box,
7.3 When packaging the product, overlap the front of each two pieces, separate them with 17g/m2 white copy paper, pack 50 pieces in a box and affix the certificate mark, then pack in a double corrugated carton, 10 boxes per box, and tie it in the middle of the length direction with a packing tape after sealing. 275
QB/T1578-—1992
7.4 The product should be kept clean and dry during loading, unloading and transportation, and must not be thrown, exposed to rain, or shipped together with corrosive items. 7.5 The product must be stored in a dry, ventilated room that is protected from rain and snow. The relative humidity should not exceed 80%. It is forbidden to store it together with corrosive items.
Product quality should be guaranteed within six months of normal storage. 7.6
Additional instructions:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiechang Sewing Machine Factory. The main drafters of this standard were Dong Xuejun, Chen Jialian, and Zheng Helin. 276
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