The principle of the riveting process is that the embossing tooth is pressed into the preset hole of the sheet metal. Generally, the preset hole diameter is slightly smaller than the embossing tooth of the rivet nut, and the flower tooth of the rivet nut is squeezed into the plate by the pressure So that the perimeter of the hole is plastically deformed and the deformation is squeezed into the guide groove, thereby producing a locking effect.
In many cases, you need to install other parts or components on the sheet metal parts.If the panel can be installed buttons, switches, or other electronic devices, may also be unable to connect between the sheet metal.For more convenient and reliable installation and connection, commonly used to One is the riveting process.
The principle is that the presetting hole is pressed into the sheet metal through the embossing tooth. Generally, the preset hole diameter is slightly smaller than the embossing tooth of the rivet nut, and the pressure of the rivet nut is pressed into the plate by the pressure to cause the hole Of the surrounding plastic deformation occurs, the deformation is squeezed into the guide groove, resulting in locking effect.
First, the rivet nut
1, the common metric rivet nut type: vS-M3-0, CLS-M3-0; S-M3-1, CLS-M3-1; S-M3-2, CLS-M3-2vS-M4-0, CLS -M4-0; S-M4-1, CLS-M4-1; S-M4-2, CLS-M4-2vS-M5-0, CLS-M5-0; S-M5-1, CLS-M5-1 ; S-M5-2, CLS-M5-2
Rivet nut dynamic chart
2, the rivet nut model difference: S-M3-1-ZC as an example
A, Material: S for carbon steel, CLS for stainless steel, CLA for aluminum
B, tail code: S-M3-1-ZC as an example
0 → 0.76MM (for 0.8MM plate)
1 → 0.97MM (for 1.0-1.2 plate)
2 → 1.37 (for 1.5-2.0 plate)
(-0 / -1 / -2 only tail code code, the specific value of the need to check PEM, in the production and inspection we can check the packing label to see the riveting specification is correct)
C, pressure rivet bottom hole:
M2, M2.5, M3 bottom hole is 4.3MM. C nut value is 4.22MM
M4's bottom hole is 5.4MM, the nut's C value is 5.38MM
M5 bottom hole 6.4MM, nut C value of 6.38MM
D, SP type of rivet nut: designed for pressure stainless steel material.
3, the British rivet nuts: such as S-632-0, S-832-1 and so on.
Said method except thread specifications other than the same metric.
4, the rivet nut means that to S-M3-1-ZI as an example:
S-M3-1-ZI means:
1, made of carbon steel (ordinary steel)
2, thread size M3
3, -1 means that the nut A value of 0.97MM, for the thickness of 1.0-1.2mm products
4, surface treatment for the zinc plated riveting nut
Note: The handle code (0 - for the thickness of 0.8mm, 1- for the thickness of 1.0-1.2mm, 2- for the thickness of 1.5-2.0mm)
Second, the rivet screws
1, common metric riveting screw type: vFH-M3-6, FHS-M3-6
Rivet screw dynamic diagram
2, round head rivet screws: FH-M3-6-ZC
A, the material is divided into: steel-FH stainless steel-FHS aluminum - FHA
B, the same bottom hole and thread (such as M3 bottom hole is 3.0MM, M2.5 bottom hole is 2.5MM)
C, rivet screw round head diameter: M2.5-Φ4.1MM M3 - Φ4.6MM M3.5-Φ5.3MM M4-Φ5.9MM M5- Φ6.5MM M6-Φ8.2MM M8-Φ9.6MM
D, Metric riveting screw: Length is the length of the standard code: If the length of FH-M3-6 is 6MM
3, hex head rivet screws: NFH-M3-12-ZC
A, the material is divided into: steel-NFH stainless steel-NFHS
Hex head riveting screw is relatively less used
4, British rivet screws: FH -832-6-ZI
It should be noted that its length and metric is not the same
Where: L = 6 × 1/16 × 25.4 = 9.5 mm
That is, L = (length code × 1/16 × 25.4) mm
5, riveting screw means that to FHS-M3-8-ZI as an example:
FHS-M3-8-ZI means:
1, the material is stainless steel
2, thread size M3
3, the length of the screw 8MM
4, the surface treatment of zinc plated riveted screws.
6, pre-punching the bottom hole parameters
Third, the riveting studs
1, common metric riveting stud type:
SO-M3-6, BSO-M3-6; SO-M2.5-6, BSO-M2.5-6; SO-3.5M3-6, BSO-3.5M3-6
Rivet stud dynamic charts
1, Through hole: SO-M3-8-ZI
a, the material is divided into: steel-SO stainless steel -OS
b, SO-3.5M3-8-ZC (3.5 means bottom hole is 5.4MM, C value is 5.38MM)
SO-M3-8-ZC (bottom hole is 4.2MM, C value is 4.19MM)
SO-M4-8-ZC (Bottom hole is 6.0, C value is 5.95MM)
SO-3.5M4-8-ZC (bottom hole is 7.2, C value is 7.11MM)
2, blind hole: BSO-M3-8-ZC
a, the material is divided into: steel-BSO stainless steel-BSOS
b, BSO-3.5M3-8-ZC (3.5 indicates the bottom hole is 5.4MM, C value is 5.38MM)
BSO-M3-8-ZC (bottom hole is 4.2MM, C value is 4.19MM)
BSO-M4-8-ZC (bottom hole 6.0, C value 5.95MM)
BSO-3.5M4-8-ZC (bottom hole 7.2, C value 7.11MM)
3, inch Rivet studs: such as SO-632-12-ZC
Where: L = 12 × 1/32 × 25.4 = 9.5 mm
That is, L = (length code × 1/32 × 25.4) mm
Stud categories: SO said ordinary steel studs,
SOS stainless steel through-hole studs,
SOA stands for aluminum through-hole studs.
BSO said ordinary steel blind hole studs,
BSOS stainless steel blind hole studs,
BSOA aluminum blind hole studs.
SOO said ordinary steel through-hole studs,
SOOS stainless steel through-hole studs,
SOOA aluminum through-hole studs.
Stud 3.5M3 and M3 difference: all M3 teeth, but 3.5M3 wall thickness than M3, the bottom hole is not the same.
The difference between the studs 6440 and 440 is that the wall thickness of the 6440 is larger than 440, the bottom hole of 6440 is & 5.4, and the bottom hole of 440 is & 4.2
Said that the method to BSO-3.5M3-8-ZI as an example:
BSO-3.5M3-8-ZI means:
1, no hole
2, made of carbon steel (ordinary steel)
3, thread size M3
4, stud rivet bottom hole is Ø5.4
5, a height of 8MM
6, the surface treatment for zinc plated riveted studs
Pressure riveting process of quality control
1, riveting process Processing: Riveting nuts, screws, studs and custom hardware riveting pieces (guide pin, positioning support column, etc.), electrostatic hand-Bowl, pressure riveting wrenches and so on.
2, the material riveting pressure, specifications and models must be consistent with the drawings, not the wrong pressure specifications;
3, before the riveting rivets must confirm in a timely manner the production line pressure riveting outside the logo and the bag in the physical (material, specification model) is consistent with the drawing requirements, the bag is mixed material phenomenon.
4, after the riveting on the product pressure riveting pieces of material, specifications and thread random sampling, whether the drawings required, with or without pressure, wrong pressure, the location of the wrong pressure, mixing and so on.
5, Riveting pressure riveting around the riveting member may not have raised or depressed significantly deformed, may not have obvious surface treatment can not cover the imprint or mold imprint.
6, Riveting shall not be tilted after the riveting parts shall not be loose, fall off, we must test its firmness; its push-pull and torque values must meet the specifications of riveting parts PEM requirements.
7, the pressure riveting pressure rivet parts must be qualified, through the regulations, only rules.
8, for the product from the edge of the hole or hole near the riveting pressure riveting will cause significant distortion of the edge of the product or around the hole, according to the deformation, the situation expected to take the appropriate measures (such as school shape, or polished) to Achieve drawing size, appearance requirements.
9, after pressing the rivet shall not appear pressure crooked, pressure deviation phenomenon, we must ensure that the thread and its corresponding hole is concentric.
10, in the bending edge or mold forming the edge of the pressure riveting pieces to be focused on, especially the thread, the appearance (deformation) to focus on testing.
11, a single product Riveting studs, the number of screws are more, some products will be made for a dedicated fixture riveting, the other need to do a special fixture to check whether there is leakage pressure or wrong pressure and other defects;
12, the riveting is completed after the test is required to check whether the flatness within the range, if excessive need to be transferred to the fitter-shaped processing.