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| Advantages and disadvantages of various molding machine |
| Time：2015-11-17 Source： Views：7986 |
As a foundation for the equipment manufacturing industry of foundry industry, due to the consumption of raw material is given priority to with non-renewable resources, lead to the industry belongs to high energy consumption, pollution, labor intensive industry. So how to achieve better energy-saving equipment, environmental protection is better, higher production efficiency is the biggest issue facing the casting machine industry. Wet physical hardening sand mold casting is the current domestic and international application of casting process, the most widely in metal casting about accounted for more than 80% of the whole black metal casting. The adaptability of the casting process is very wide, small, big, complex and simple, single, large quantities of all can use. At present domestic for the casting process to make casting sand mold molding machine mainly has the following kinds:
1, vibrated moulding machine
This kind of molding machine working principle are the fixed sand box and shape in the work in the molding machine, using the workbench whereabouts collided with the anvil block impact inertia to tight sand, sand. This kind of molding machine equipment has the advantage of low cost, simple operation. Defect is sand mold with uneven density, especially the upper compactness, noise is serious, workers labor intensity, low production efficiency, serious environmental pollution, the bigger impact to plant building. The machine has been gradually replaced by seismic squeeze moulding machine.
2, squeeze moulding machine
The working principle of this machine is of vibrated to compaction of sand mould, top and bottom of tight sand mold can be obtained. Commonly used is the micro vibration compacting moulding machine (micro vibration compacting moulding machine) is the use of workbench whereabouts collided with floating shock iron, microtremor tight sand, and then to compaction. Microtremor in high frequency (500 ~ 1000 times/min), the vibration of the small amplitude (5 ~ 25 mm) instead of vibrated moulding machine of low frequency (60 ~ 120 times/min), a large amplitude vibration. The molding machine equipment has the advantage of low cost, simple operation, basic uniform made the compactness of sand mould, requirements for plant building is low. The disadvantage is that noise is serious, workers labor intensity, low production efficiency, and serious environment pollution.
3, compacting moulding machine
The working principle of this machine is using pneumatic or hydraulic pressure head or shape of sand sand pressure to tighten in the sand. Its pressure is generally 0.25 ~ 0400000 mpa. The molding machine, away from the pressure surface sand mould compactness is poor. Appeared in the early 1950 s high pressure molding machine, sand mold of the pressure in the plane of the over 0.7 million mpa. High pressure molding machine head can be divided into flat head, forming pressure head and contact pressure more top several kinds of structure forms. Of which the most high voltage contactor molding machine used more widely.
High pressure more contact molding machine head split into many can up and down movement of the small square ─ ─ contact, through the hydraulic cylinder can obtain a lot of pressure. Pressure in real time, the contact according to the shape underneath height (i.e., compression of sand layer thickness) of the corresponding pressure sand mold, get high, compactness and hardness of the uniform. This kind of molding machine is equipped with micro vibration mechanism, can adapt to the modelling of complex shape. High pressure more contactor molding machine adopts four pillar structure, with single and double location. In order to adapt to small and medium-sized batch casting production, the molding machine with more templates quick change device, replacing template, molding machine don't have to stop. The advantage of the molding machine is made good compactness of sand mould. The disadvantage is that the noise is serious, the worker labor intensity big, the production efficiency is low, and serious environment pollution.
4, vertical pressure type flaskless molding machine
Its working principle is to use compressed air to sand evenly into the sand box pre tight, then the external pressure for compaction. Vertical parting flaskless shoot pressure molding machine model without sand, sand directly into the room with the modelling of the template. This advantage is made sand mold size precision, because both sides sand box are cavity, productivity is high. The disadvantage is that the core is difficult, the green sand quality requirement is very strict.
5, horizontal parting box shot off pressure molding machine
The class type is currently the top international and domestic sand mold molding machine, currently only Japan new east, east Japan for a long time, the hunter can produce, but because it is expensive in the practical application of China foundry industry is limited by a lot, too. Its working principle is to use compressed air to sand evenly into the sand box pre tight, then the external pressure for compaction. Horizontal parting box shot off pressure molding machine using sand box to modelling, sand mold built after the closed type to take off the box. The machine made sand mold size has the advantage of high precision, the core is more convenient, which can realize double location, high productivity, the core sand leakage is less. The disadvantage is that the compactness of sand mould slightly insufficient, made sand mold in turn, easy to easy to collapse, in the process of launching another is cost is higher, general customers are more difficult to accept.
Artificial modelling and automatic energy-saving index contrast table shape
Refers to the standard
Energy saving point
Energy saving measures
Refers to the standard
Reduce the amount of
reduce
Electricity consumption
Each type of casting
Save with sand amount
Sand mold solid degree is high, good strength, small sand mold shape.
- 20 kg /
- 1 degrees /
Each type of saving amount of compressed air
A compaction sand, molding, do not need to repeatedly pneumatic shock vibration.
- 2 cubic /
- 0.5 degrees/type
Each type of transmit electricity saving
Directly to the sand box automatic clamping, up and down and then push to casting line, without sand box hoisting turnover, transfer many times.
- 0.4 degrees/type
Save the amount of new sand mixed with each type
After increased the strength of sand, sand source sand content can be improved.
- 6 kg /
- 0.3 degrees/type
Combined meter
- 2.2 degrees/type
Molding machine technical parameters at home and abroad
models
indicators
Traditional vibrated moulding machine
Traditional squeeze moulding machine
Traditional compacting moulding machine
Japanese level classification box molding machine
The production efficiency
(SEC/type)
210
210
120
36
Sand powder were leaked
(kg/H)
more
more
more
2 or less
Power consumption index (K)
3
3
2
1
Rejection rate
(%)
10% or higher
10% or higher
8% or less
3% or less
Running noise
(db)
85% or higher
85% or higher
80% or higher
76% or less
Old sand recycling sand percentage (%)
85% or less
85% or less
90% or less
95% or higher
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