This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of push plates for household sewing machines. This standard applies to push plates for household sewing machines. QB/T 1573-1992 Push plates for household sewing machines QB/T1573-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Household sewing machine
Subject content and scope of application
QB/T1573—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of push plates for household sewing machines. This standard applies to push plates for household sewing machines. 2
Referenced standards
Packaging, storage and transportation pictorial marking
GB 191
GB/T2828Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB/T2829 Periodic inspection counting sampling procedure and sampling table (applicable to inspection of production process stability)GB5926Appearance quality test method for metal coatings and chemical treatment layers of light industrial productsGB5930
Thickness test method for metal coatings of light industrial productsDrip methodTest method for bonding strength of metal coatings of light industrial productsGB5933
GB5934
Hardness test method for metal coatings of light industrial productsMicrohardness methodGB 5938Corrosion resistance test method for metal coatings and chemical treatment layers of light industrial productsNeutral salt spray test (NSS) methodZBY 17011
3Product classification
Special thread for sewing machines
Types and sizes are shown in the figure below.
Main surface
2—SM 3/32\ X56
Approved by the Ministry of Light Industry of the People's Republic of China on August 31, 19923
Implemented on April 1, 1993
4Technical requirements
4.1Main dimensions shall comply with the following provisions:
a. Length: 73-0.3mm;
b. Width: 63.8-a.19mm
Center distance between two screw holes: 18mm
QB/T 1573—1992
4.2Two screw holes SM3/32\×56 shall comply with the second-level accuracy provisions of ZBY17011. 4.3 The corrosion resistance of the electroplating layer is continuous spraying for 36 hours, and the corrosion resistance level is not less than level 7. 4.4 The roughness value of the main surface of the electroplating layer should not be greater than R.0.1. 4.5 The friction of the chrome plating layer should not be less than 0.3 turn m. 4.6 The hardness of the electroplating layer should not be less than 450HV0.05. 4.7 The electroplating layer should be firmly bonded, and there should be no separation between the plating layer and the plated part or between the plating layers. 4.8 The electroplating layer should be free of rust and peeling, and the main surface should have no obvious bubbles, spots, pinholes and burrs, and should be smooth and flat, with basically the same color. 4.9 The surface of the plating layer should be flat, without obvious stripes and bumps. 5 Test method
5.1 The dimensions specified in Article 4.1 are measured with measuring tools of corresponding accuracy levels. 5.2 The screw holes specified in Article 4.2 are measured with special thread gauges. 5.3 The corrosion resistance of the electroplating layer is measured in accordance with the provisions of GB5938. 5.4 The roughness of the main surface after electroplating shall be measured in accordance with the provisions of GB5926. 5.5 The thickness of the chrome plating layer shall be measured in accordance with the provisions of GB5930. 5.6 The hardness of the electroplating layer shall be measured in accordance with the provisions of GB5934. 5.7 The bonding strength shall be determined in accordance with 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 determined by comparison with the standard sample.
6 Inspection rules
6.1 Products can only be shipped after being inspected and qualified by the inspection department and accompanied by an inspection certificate. 6.2 Inspection classification
6.2.1 Factory inspection
The factory inspection items specified in Table 1 shall be carried out within the period specified in the order contract. Table 1
Inspection classification
Inspection items
Appearance quality of electroplating layer
Thickness of chrome plating layerwww.bzxz.net
Hardness of electroplating layer
Bonding strength of electroplating layer
Document number
Factory inspection
Qualified quality
Unqualified
Type inspection
Judgment level
Unqualified
Quality level
Inspection items
Center distance between two screw holes
Precision of two screw holes
Main surface sugar content
Anti-corrosion ability of electroplating layer
Main surface flatness
6.2.2 Type inspection
Inspection classification
QB/T 1573—1992
Continued Table 1
Document No.
Committee·Collective
Perform factory inspection on normal production products every six months according to the items specified in Table 1
Qualified quality
Unqualified
Model inspection
Grade level
Unqualified
Quality level
6.3 The classification of unqualified products is classified into two categories, B and C, according to the provisions of GB/T2828. The classification of unqualified items of 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 is carried out according to the normal sampling plan specified in GB/T2828. The qualified quality level shall comply with the provisions of Table 1.
6.4.1.2 Sample Selection
Samples for batch inspection shall be randomly selected from the inspection batches to be inspected. 6.4.1.3 Determination of the Quality of Single Products
The quality of single products shall be determined according to the grouping provisions in 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 single products, but shall be calculated according to the total number of unqualified items accumulated in all samples and determined in the product batch quality. Class B items in Groups 1 and 2 shall be counted as the number of unqualified products, and Class C items in Group 3 shall be counted as the number of unqualified items. 6.4.1.4 Determination of the Quality of Product Batch
After all samples are inspected, they shall be judged according to the inspection batch size and batch quality determination group specified in Table 2. If the number of unqualified items in each group of samples is less than or equal to the qualified determination number 4., the batch of products shall be judged to be qualified. If the number of unqualified items in any group is greater than or equal to the unqualified determination number R., the batch of products shall be judged to be unqualified.
Batch of incense flower group
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 are all technical requirements specified in this standard. Regular inspection shall be carried out according to the sampling plan specified in GB/T2829. The discrimination level and unqualified quality level shall comply with the provisions of Table 1. 6.4.2.2 Sample extraction
QB/T 1573. 1992
The sample to be inspected shall be drawn from the qualified batch or several batches of the batch inspection, and the sample size shall be specified in Table 3. Table 3
6.4.2.3 Determination of the quality of a single product
The method specified in 6.4.1.3 of this standard shall be followed. 6.4.2.4 Determination of product cycle inspection
After the quality of a single product is determined, the inspection sample size and determination group specified in Table 3 shall be used for determination. 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 products of the cycle are determined to be qualified. If the number of unqualified products in any group is greater than or equal to the unqualified determination number R., the products of the cycle are determined to be unqualified.
6.5 The inspection batches judged to be unqualified shall be fully inspected by the manufacturer, and re-batch them for inspection after removing the unqualified products. When submitting for re-inspection, the re-inspection records shall be attached. If the re-inspected batch is still judged to be unqualified, the batch of products shall not be accepted again. 6.6 In the inspection batches judged to be qualified, the unqualified products found in the inspection shall be refurbished to qualified products or replaced with similar qualified products. 7 Marking, packaging, transportation, storage
7.1 The outer packaging should be marked with:
Product model, name, quantity:
Supply number, article number;
Box size:
d, net weight, gross weight;
Manufacturer name, date of production.
7.2 Storage and transportation graphic signs should comply with the provisions of GB191. 7.3 When packaging the product, the front faces of each two pieces are overlapped, separated by 17g/m white copy paper in the middle, 50 pieces are packed in a box, and the box is sealed after applying 101 anti-rust oil. The certificate mark is affixed to the outside of the box, and then it is packed in a double corrugated paper box, 8 boxes per box, and after sealing, it is tied in the middle of the length direction with a packing tape. 7.4 The product should be kept clean and dry during loading, unloading and transportation, and must not be thrown, rained, or shipped 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 prohibited to store it together with corrosive items.
7.6 Product quality should be guaranteed within six months of normal storage. Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard was developed by the National Sewing Machine Standardization Center. This standard was drafted by Shanghai Xiexi Sewing Machine Factory. The main drafters of this standard were Tong Xuejun, Chen Jialian, and Zheng Helin. 246
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