Let me share with you the five commonly used connection methods for sheet metal parts:
1. Flanging Riveting
2. Rivetless Connection (BTM)
3. Pull Nail Riveting
4. Resistance Spot Welding
5. Screw Connection
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A fastening process in which the sprout of one iron piece is pre-fitted with the through hole or salad hole of the other work piece, and then the round punch is used to press the turn switch of the sprout peripheral wall against the salad or plate surface of the other work piece, thereby connecting the two work pieces.
2. Flanging and Riveting Elements
1) Germination: a stamping process in which the iron parts are stretched out into a ring-shaped column.
A. Process steps: pre-punch one-by-one stretching (multi-stage stretching)
B. Pre-flushing: it affects the shape and height of buds
C. Control parameters: sprout height/external tightness/wall thickness
2) Salad: If connecting thick workpieces, it is often necessary to press the salad on the connecting surface first. Its main purpose is to facilitate the flanging and bonding, and the riveting automatic guiding function.
A. Punch shape: conical
B. Matching tolerance (sprouting outer diameter/via hole): 0.050.1mm on one side
3. Common Failure Modes and Prevention
1) Riveting loosening: riveting under the use of tensile force, shear force or other cyclic loads.
Reason: The flanging is not fully opened, the flanging pressing area is too narrow, and the flanging is broken
A. The height of budding is in place, to avoid budding into continuous flower cracking or vertical cone-shaped staggering.
B. Increase uniform salad, increase pre-pressure when riveting, avoid assembly before riveting
2), the riveting is too high: the buds are higher than the allowable height after flanging
Reason: The flanging is not fully opened, and the thickness of the budding wall is too large
Prevention: reduce the wall thickness, increase the riveting force, increase the taper of the riveting punch, etc.
4. The deformation of the workpiece in the riveting area: the surrounding convex and concave distortion, etc.
Reason: riveting is too dead, the template is deformed
Prevention: mold or machine for limit, mold for regular maintenance
4. Rivetless Connection (BTM)
Rivetless connection (BTM) can be widely used in the connection of various thin metal plate parts such as automobiles, light industry, precision machinery, electrical appliances and home appliances, and hardware decoration.
Definition and Working Principle
Resistance welding is a welding method for joining metal workpieces together. By applying, controlling and maintaining a certain pressure between the workpieces to be welded, a stable contact resistance is formed between the workpieces.
Then make the control current output by the welding power source controller flow through the contact surface between the workpieces to be welded, generate heat, increase the temperature, locally melt the contact point, and control the heat size and process of the process. So as to achieve the purpose of welding the metal workpieces together.
Single-point butt-welding method: a single-circuit of a solder joint, the usual method;
Two-point parallel welding method: two welding points, the current loop is divided, there is energy loss, but the efficiency is high.
Fifth, screw connection
1. A detachable connection method
2. Common methods:
A. Self-tapping bud screw B. Tapping bud + screw connection C. Riveting stud/nut + screw
3. Common tools: pneumatic screwdriver/electric screwdriver, etc.
4. Control parameters: torque