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何What ultrasonic welding
Ultrasonic vibration on at the same time, according to the pressure that part of the plastic products for friction heat softening, welded together. |
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The mating shape case badong
（1） |
Cant mating |
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The bonding is the use of the surface in order to achieve complete cant. Because of the heat and can obtain homogeneous welded, welding area, high strength, good air-tightness.
The attention in design
- The Angle is dealt with the welding area is larger also, but due to the combining sliding surface, so it needs to greater energy. On the other hand, when the gradient for acute, formed in the state when the welding, and dealt with open, reducing the deformation caused by melting and etc, may cause undesirable problems. In the design is we must consider the thickness of the processing, thickness should be set in 30-60 range.
- Will the two molding product in welding, determine the longitudinal and combination of horizontal depth is particularly important welding. Although set by the size of the use of plastic level and performance requirements and longitudinal and transverse vision, but the set standards for about 0.7 mm 0.4 ~.
- In order to ensure welding scarfing stability, as far as possible the badong bigger design. Actually the clearance of molding design of large will not occur, and there're not pressed into the. One set to 0.05 mm for the best around.
- In order to achieve the products after welding dimension (into) the stability, must have runner. Set for may soften the welding position.
- To prevent the welding occurs when the melting flash, best can have flash stranded.
- Below is the most representative cant joints, and the design case of mating weld strength. Shape,
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（2） |
Successive joint |
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Belong to shear vibration direction by welding, contact areas get uniform heat, its air-tightness, welding strength are extremely good. However, after welding will flash on the surface, especially the stranded does not allow to have the flash, must pay attention to.
The attention in design
- The badong Angle consideration method cant joints. Also want to consider the thickness of processing, we wish to set in 40 ~ 50 range.
- With the depth of welding is usually set tilt part of longitudinal and transverse 1.2 mm 1.0 ~ 0.3 ~ 0.5 mm. When the vertical welding depth change its welding strength will also change, quantity of welding welding words to flash, which caused a rupture, airtight etc. In addition, the depth of proper weld transverse preferred.
- The gap setting, cant joints for 0.05 mm unilateral setting.
- About runner plug, otherwise, set in the depth of the welding can be really melt soldering position.
- Below is the most representative successive contacts, and the design of shape contact welding strength.
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（3） |
Shearing |
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In front of the junction between what cant with successive mating between, because good air-tightness, can effectively welding outside round shape, are often used.
Regarding the attention in design, with the same junction cant.
Below is the most representative shear design case, and the junction of the intensity of welding joints shape. |
 
（4） |
Directed energy |
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This way is to focus on energy called the triangle of repeated impact generated by the quantity of heat of design.
Its advantages are simple, shape, the smaller part mating restrictions.
But the products of this company for crystal plastic, excessive local heat causes bate, melting, causing a loss of pressure welding stress, airtight etc, must pay attention. |
 
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The attention in design
- For the triangle of badong triangles, front part equilateral triangle or Angle of 60-90 degrees to set about the best. The quantity of welding dimension and height direction Angle, usually set by 0.5 mm in.
- Contact with the triangle convex molding product at the other end of the welding parts, the products of the decision and welding position Settings prevent melt cause flash exposed the groove. When the welding grooves are softening must be higher than the triangle of volume. At this time, the height of the triangle groove depth + welding for depth.
- Below is the most representative of energy, and the design of directional mating weld strength of the jointing shape.
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Molding product design
（1） |
The badong shape |
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The circular shape in badong for the best. In extreme situations, must design angles or special-shaped shape, then each edge horn, pour R possible or design symmetrical shapes. |
（2） |
Transmission distance |
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The distance to the welding of shorter, welding energy loss is smaller. Can undertake good welding.
However, if the cylindrical shape for large flat, welding thin plate, slightly higher position is removed from the cylindrical parts contacting on molding product shape necessary changes. |
（3） |
Contact with cylindrical shape tool |
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Contact with cylindrical shape tool, lightweight, and as far as possible simple shape.
When in contact with cylindrical tool of metal forming contain embedded parts, accessories, because such wheel welding energy transfer is not seasonable, easy cause welding. Sometimes caused by resonance embeded parts of melting metal wheel etc, extruding part fracture. Therefore, extruding part, etc. Must be placed on the fixture, fixed in under the circumstances, please pour R Angle to increase strength of the products. |
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Cylindrical tool surface |
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Please contact the cylindrical tools for the plane design and the jointing surface. If the design for the flight, will cause the welding energy transfer caused by uneven, easy welding undesirable. |
（5） |
deformation |
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Necessary to control the warping deformation by welding. If produce warping deformation, will lead to the combination of welding, welded and strength, sealing etc. |
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| The welding conditions
As a condition of ultrasonic welding, the most important is the time (on welding energy vibration, welding time length and pressure, of course, other conditions are also very important.
（1） |
Welding machine |
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Now on the market have various types of welding machine, but must choose suitable for welding products which shape, size of welding machine. |
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The amplitude of cylindrical tools |
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The ability to welding machine, welding machine is very important as a set of conditions, can be carried out smoothly is one of the necessary welding parts. In our company, its welding materials for amplitude minimum of 40 muon m (double amplitude), sometimes for 70-80 amplitude must close m. |
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Added pressure |
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Using the tools of cylindrical compression molding process. General compressed air pressure gauges for 0.10.3 (MPa), sometimes a few taller. But, if using high pressure, will retard cylindrical vibration. If the glass fiber reinforced materials, can proper welding pressure to get good to improve the welding products. |
（4） |
Welding time |
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Because of the type of material and products shape, some processing of welding time need only 0.2 seconds had enough. For a long time can cause excessive welding and have a lot of flash and bubbles, resulting in airtight, must pay attention to. |
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Cooling (keep) time |
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Our company is the crystallization of plastic material, if the temperature in the melting point, connecting parts will be solidification, usually kept pressing 0.1 ~ 0.2 seconds in between. |
（6） |
Drop rate of cylindrical tools |
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Successive jointing, impact in the state. In addition, the use of other jointing way also can damage to the molding product, therefore decreasing speed in 50 / s. |
（7） |
K vibration period began |
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With cylindrical tools and molding product before contact for simultaneous or vibration. If the pressure condition occurred after the vibration amplitude, will result in the loss. |
（8） |
Undertake tools (figure 2-15), |
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Use this kind of tool, in order not to hinder purpose is dealt with, the free vibration molding product in a fixed position. Because of the branch is located directly, must be dealt with metal, plastic thermal curing of design.
Again, in order to prevent the outside except energy directional connection crosswise deformation occurs. Products and undertake the gap (both) tool for 0.05 ~ 0.2 mm. In addition, make sure cylindrical surface and undertake tool surface tool to keep parallel. |
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The intensity of ultrasonic welding materials of various materials of ultrasonic welding
Our company is the strength of welding materials, bel
Compared with other materials, except Fortron 1140A1 (glass fiber reinforced level), other welding strength between the material and without too much difference. |
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