CNC Customized Drawing Design Sand Casting Aluminum Gravity Casting

 

The common problems encountered in die casting production are as follows:

1. Pouring system, overflow system

(1) Requirements for the direct runner of the mold on the cold chamber horizontal die-casting machine: ① The inner diameter size of the pressure chamber should be selected based on the required specific pressure and the filling degree of the pressure chamber. At the same time, the inner diameter deviation of the gate sleeve should be appropriately enlarged by a few threads compared to the inner diameter deviation of the pressure chamber, so as to avoid the problem of punch jamming or severe wear caused by the different axes of the gate sleeve and the inner diameter of the pressure chamber, and the wall thickness of the gate sleeve should not be too thin. The length of the gate sleeve should generally be less than the delivery lead of the injection punch to facilitate the release of the coating from the pressure chamber The inner holes of the pressure chamber and gate sleeve should be finely ground after heat treatment, and then ground along the axis direction, with a surface roughness of ≤ Ra0.2 μ m. ③ The splitter and the concave cavity that forms the coating have a concave depth equal to the depth of the transverse gate, and its diameter matches the inner diameter of the gate sleeve, with a slope of 5 ° along the demolding direction. When using a coating guide type sprue, the volume of the effective length of the pressure chamber is shortened, which can improve the filling degree of the pressure chamber.

(2) Requirements for the transverse runner of the mold: ① The entrance of the transverse runner of the cold horizontal mold should generally be located at the upper part of the pressure chamber with an inner diameter of more than 2/3, to prevent the metal liquid in the pressure chamber from entering the transverse runner prematurely under the action of gravity and starting to solidify earlier. ② The cross-sectional area of the transverse sprue should gradually decrease from the vertical sprue to the inner sprue. In order to expand the cross-sectional area, negative pressure will occur when the metal liquid flows through, which is easy to absorb gas on the parting surface and increase the vortex entrapment in the metal liquid flow. The cross-section at the outlet is generally 10-30% smaller than that at the inlet. ③ The transverse sprue should have a certain length and depth. The purpose of maintaining a certain length is to stabilize and guide the flow. If the depth is not enough, the metal liquid will cool down quickly, and if the depth is too deep, the condensation will be too slow, which not only affects productivity but also increases the amount of return material used. ④ The cross-sectional area of the transverse gate should be greater than the cross-sectional area of the inner gate to ensure the speed of metal liquid entering the mold. The cross-sectional area of the main runner should be greater than the cross-sectional area of each branch runner. ⑤ The bottom sides of the transverse runner should be rounded to avoid early cracks, and a slope of about 5 ° can be made on both sides. The surface roughness of the transverse runner is ≤ Ra0.4 μ M.

(3) Inner gate: ① The parting surface should not be immediately closed after the metal liquid enters the mold, and the overflow and exhaust grooves should not directly impact the core. The flow direction of the molten metal after injection into the mold should be as close as possible to the ribs and heat dissipation fins that are cast in, and should be filled from thick walls to thin walls When selecting the position of the inner gate, try to keep the metal flow as short as possible. When using multiple internal gates, it is necessary to prevent the merging and mutual impact of several strands of molten metal after injection, resulting in defects such as eddy current gas inclusion and oxidation inclusions The thickness of the inner gate of thin-walled parts should be appropriately smaller to ensure the necessary filling speed. The setting of the inner gate should be easy to cut and not cause defects (meat eating) in the casting body.

(4) Overflow groove: ①: The overflow groove should be easy to remove from the casting and try not to damage the casting body as much as possible. ② When opening an exhaust groove on the overflow groove, it is necessary to pay attention to the position of the overflow port to avoid premature blockage of the exhaust groove, making it ineffective Multiple overflow ports or a very wide and thick overflow port should not be opened on the same overflow groove to prevent cold liquid, slag, gas, paint, etc. from returning to the mold cavity from the overflow groove, causing casting defects.

2. Casting rounded corners (including corners): The casting drawing often indicates requirements such as rounded corners R2 that are not indicated. We must not ignore the role of these unspecified rounded corners when opening the mold, and must not make clean corners or excessively small rounded corners. Casting rounded corners can ensure smooth filling of metal liquid, orderly discharge of gas in the cavity, reduce stress concentration, and extend the service life of the mold. Castings are also less prone to cracks or various defects due to poor filling at this location.

3. Demolding angle: It is strictly prohibited to have artificially caused side dents in the demolding direction (often due to the casting sticking to the mold during mold testing, and improper methods such as drilling, hard chiseling, etc. causing local dents).

4. Surface roughness: The forming parts and pouring system should be carefully polished according to the requirements, and should be polished along the direction of demolding. Due to the fact that the entire process of metal liquid entering the pouring system from the pressure chamber and filling the mold cavity only takes 0.01 to 0.2 seconds. In order to reduce the resistance of metal liquid flow and minimize pressure loss, it is necessary to have a high surface finish flowing through it. At the same time, the heating and erosion conditions of the pouring system are relatively poor, and the poorer the smoothness, the more likely the mold is to be damaged.

5. The hardness of the mold forming part, aluminum alloy: around HRC46 °; Copper: HRC38 ° or so; During processing, the mold should have as much margin for repair as possible, with a maximum size limit to avoid welding.

 

Technical requirements for die casting mold assembly: 1. Requirements for parallelism between the mold parting surface and the template plane. 2. Requirements for verticality of guide pillars, guide sleeves, and templates. 3. The height between the upper moving and fixed mold insert plane of the parting surface and the moving and fixed mold sleeve plate is 0.1-0.05mm. 4. The push plate and reset rod are flush with the parting surface, and generally the push rod is recessed by 0.1mm or according to user requirements. 5. All moving parts on the mold are reliable in movement, without any movement.

6. The positioning of the slider is reliable, and the distance between the core and the casting is maintained when the mold is pulled out. The matching part between the slider and the block is more than 2/3 after the mold is closed.

7. The roughness of the runner is smooth and seamless.

8. When closing the mold, the local gap on the parting surface of the insert block is less than 0.05mm.

9. The cooling water channel is unobstructed and the inlet and outlet signs are marked.

10. The formed surface roughness Rs=0.04, without minor damage.

 

 

 

Basic Information

Total Capitalization	less than US$50,000
Country / Region	China
Year Established	2014
Total Employees	100 to 149
Business Type	Exporter, Manufacturer, Trading Company

 

Trading Capabilities

Total Annual Sales	less than US$50,000
Export Percentage	90 percent to 94 percent
OEM Services	Yes
Small Orders Accepted	Yes
Brand Names	Innolead
Payment Terms	TT
Main Competitive Advantages	Experienced R&D Department, Large Product Line, ODM (Original Designing & Manufacturing), OEM Capability, Production Capacity, Reliability, Reputation
Other Competitive Advantages	NA
Major Customer	Soprano, European Thermodynamics Ltd.
Export Markets	Australasia, Central/South America, Eastern Europe, Mid East/Africa, North America, Western Europe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTACT US

Alex He

Tel:+86 15989331617

Whatsapp&Wechat:+86 15989331617

Skype ID:alex.ho43

Email: alex.he@innolead.net

 

Web:www.innolead.net

 

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