JB/T 7899-1999 This standard is a revision of JB/T 7899-95 "Technical conditions for filled polytetrafluoroethylene soft tape guides". This standard specifies the technical requirements for materials, design, bonding, processing and assembly of bonded filled polytetrafluoroethylene soft tape guides. This standard applies to soft tape guides for metal cutting machine tools and measuring instruments. Soft tape guides for other machines should also be used as a reference. This standard was first issued in 1989 as GB 10905-89 and was adjusted to JB/T 7899-95 on April 14, 1996. JB/T 7899-1999 Technical conditions for filled polytetrafluoroethylene soft tape guides JB/T7899-1999 standard download decompression password: www.bzxz.net

ICS 83.140.99
Machinery Industry Standard of the People's Republic of China
JB/T7899-1999
Filled polytetrafluoroethylene soft strip guide rail
Technical conditions
Technique specification of filled polytetrafluoroethylene slideway soft strips
Published on 1999-06-24
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T7899-1999
This standard is a revision of JB/T7899-95 "Technical conditions for filled polytetrafluoroethylene soft strip guide rails". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard replaces JB/T7899-95 from the date of implementation. This standard is proposed and managed by the Machinery Industry Plastic Products Branch of the National Plastic Standardization Technical Committee. The responsible drafting units of this standard are: Beijing Machine Tool Research Institute, Guangzhou Machine Tool Research Institute. The participating drafting units of this standard are: Shaanxi Plastic Factory. The main drafters of this standard are: Zhou Jingtian, Huang Guodian, Hu Guoming, Chen Zepei. 1 Fanquan
Machinery Industry Standard of the People's Republic of China
Filled polytetrafluoroethylene soft strip guides
Technical conditions
Techique specification of filled polytetrafluoroethylene slideway soft strips
JB/T 7899-1999
Replaces JB/T7899-95
This standard specifies the technical requirements for materials, design, bonding, processing and assembly of bonded filled polytetrafluoroethylene soft strip guides. This standard applies to soft strip guides (hereinafter referred to as guides) for metal cutting machine tools and measuring instruments. Soft strip guides for other machines should also be used as a reference.
2 Referenced standardswww.bzxz.net
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T 7898—1999
JB/T 9876—1999
Filled polytetrafluoroethylene guide rail soft belt
Method for testing and evaluating the color coating method for the joint surface of metal cutting machine tools Determination of the shear strength of the bond between vulcanized rubber and metal HG/T4853—-1981
HG/T4-854—1981
3 Materials
Method for testing the peel strength of the bond between vulcanized rubber and metal 3.1 The quality and performance of the soft belt must comply with the provisions of JB/T7898. 3.2 The performance of the adhesive should meet the requirements of the bonding process and use. 3.3 The guide rail material for bonding the soft belt shall comply with the requirements of the design drawings. 3.4 The material and hardness requirements of the matching guide rail shall comply with the requirements of the relevant standards. 4 Design
4.1 The pressure of the soft belt guide rail is generally not more than 1.0MPa, and the local pressure is not more than 12MPa. 4.2 The soft belt should be bonded to the short guide rail of the guide rail pair, and the surface roughness R of the guide rail before bonding is 1.6~6.3μm. 4.3 The width of the matching guide rail shall not be less than the width of the soft belt guide rail, and its surface roughness R is 0.4~0.8μm. 4.4 The height between the oil groove on the soft belt guide rail and the edge of the soft belt shall not be less than 5mm. When pressure lubrication is used, the depth of the oil groove must be less than the thickness of the soft belt.
4.5 The soft belt thickness of the soft belt guide rail should not exceed 1.5mm. 4.6 The soft belt guide rail should have necessary protective measures to ensure that it is not damaged during use, packaging and transportation. Approved by the State Bureau of Machinery Industry on June 24, 1999, and implemented on January 1, 2000
JB/T7899—1999
When bonding soft tape, splicing or butt jointing is allowed, but the joints must be tight and the edges should be straight. 5.1
5.2 Before bonding, the bonding surface should be cleaned and no rust, oil stains or other dirt should be left. 5.3 The surface to be coated with adhesive must be dry, and the adhesive layer should be evenly coated. The thickness of the adhesive layer after curing is recommended to be 0.08-0.20mm. 5.4 After bonding, uniform pressure must be applied, and the adhesive layer is usually 0.05~0.10MPa. The curing conditions are determined according to the requirements of the adhesive used: 5.5 After curing, the overflowed excess adhesive should be removed, the .T process margin of the soft tape should be cut off and the corners should be chamfered. 5.6 There should be no defects such as debonding, obvious bubbles and displacement between the bonding surfaces. 6 Processing and assembly
6.1 The soft belt guide can be machined or scraped by hand to achieve the dimensional accuracy requirements, but the cutting amount should be small and the grinding must be fully cooled. No defects such as warping and scratches are allowed around the oil hole. There should be no obvious scratches and scratches on the surface of the soft belt guide. 6.2
The contact between the soft belt guide (strip) and the matching guide should be uniform, and the contact index shall not be lower than the requirements of Table 1. Table 1
Product accuracy grade
Sliding guide
High precision grade
Precision grade
Ordinary grade
Note: Only when the contact index in width meets the requirements can the length be evaluated.
Transfer guide rail
The soft belt guide rail and the matching guide rail should be closely matched. The insertion depth of the 0.04mm feeler gauge between the matching surfaces shall not exceed the requirements of Table 2. 6.4
Product weight
High precision grade
Insertion depth
Precision and ordinary grade
The working reliability of the soft belt guide rail shall meet the design requirements of the product within the specified service life. 7 Inspection rules
7.1 The soft belt guide rail must be inspected piece by piece.
7.2 Inspection method
The appearance quality of the bonding is directly observed with the naked eye under normal light. 7.2.1
JB/T7899-1999
7.2.2 The quality of the bonding surface is judged by the sound produced by hitting the surface of the soft belt. 7.2.3 Shear strength and peel strength shall be tested in accordance with HG4-853 and HG4-854. 7.2.4 Contact indicators shall be tested in accordance with the provisions of JB/T9876. 7.3 Test items
7.3.1 The appearance quality of the bonding shall comply with the provisions of 5.1, 5.5, 5.6, 6.1 and 6.2. 7.3.2 The quality of the bonding surface shall comply with the provisions of 5.6, and the shear strength and separation strength shall be tested when necessary. 7.3.3 The contact indicators shall comply with the provisions of 6.3 and 6.4.
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