| Features of Lianxin 3D printing sand:

Compared with German sand, 3D printing sand has low cost and superior performance compared with domestic quartz sand;

Good high temperature and high humidity applicability, can solve the problem of slow curing caused by acid consumption after premixing the curing agent, and has good applicability;

Good strength and curing performance, can appropriately reduce the amount of binder added, cost savings while reducing the sand core gas development;

Good angle coefficient can improve the compactness of accumulation, reduce the difficulty of sand laying and improve the surface accuracy of sand core;

Suitable silicon content, low expansion performance at high temperature, reduce casting expansion defects.

Advantages of Lianxin 3D Printing Special Sand Compared with German 3D Printing Sand:

1. The price is low. The price of Lianxin 3D printing special sand is about 1/2 of the price of German 3D printing sand, which greatly reduces the production cost of casting sand;

2. Lianxin 3D printing special sand uses silica sand from Zhangwu, Liaoning, with moderate silicon content and round grain shape. A large number of production practices have proved that silica sand products produced in Zhangwu, Liaoning are more suitable for the production of cast iron and non-ferrous metal castings, and the quality of processed castings is higher. Compared with German 3D printing sand, the probability of expansion defects in castings produced by Lianxin 3D printing special sand is greatly reduced;

3. Lianxin Zhangwu silica sand has regular grain shape, good angular coefficient and strong regeneration reusability. The reuse rate of Lianxin 3D printing sand can reach 90-95%, while the reuse rate of German 3D printing sand is only 80%-90%;

4. The sand strength is higher. Under the premise of adding the same curing agent and the same amount of resin, the curing speed is unchanged, and the strength of Lianxin 3D printing special sand is more than 30% higher than that of German 3D printing sand.

| Lianxin 3D printing special sand reuse rate advantage:

At the beginning of the research and development of 3D printing special sand, Lianxin casting sand group carried out product research and development according to the principle of green casting, and recycled the old sand of 3D printing sand as the core of product research and development. Through continuous technical iteration, now, Lianxin 3D printing special sand has achieved the core technical advantages of 3D printing sand old sand regeneration. Comparing the "reuse rate of old sand", which is the most critical index for regeneration of 3D printing sand, we can see the specific difference: the reuse rate of Lianxin 3D printing special sand is as high as 90-95%, which is obviously better than the reuse rate of 80%-90% of German 3D printing sand, and also far exceeds the reuse rate of 75-80% of quartzite crushing sand.

| Lianxin Casting Sand Group 3D Printing Sand Recycling Advantages:

1. Some of the special sand for Lianxin 3D printing is Zhangwu silica sand, which has the characteristics of regular grain shape, good angular coefficient and strong natural regeneration reusability;

2. Lianxin Group Casting Solid Waste Treatment Center has the qualification of casting solid waste treatment issued by the state;

3. Lianxin Group adopts the German harmless treatment concept for casting solid waste treatment. Its technology and equipment originated from Taiwan and Japan. It has grown up in Lianxin's practice for many years and has mature production, management and application experience in the field of solid waste treatment of casting waste sand;

4. Lianxin Group in Shandong Weifang, Liaoning Zhangwu, Fujian Nanan has a number of solid waste treatment capacity of the branch, the business radius can cover 500KM.

In summary, according to the data of reclaimed sand production practice for many years, northern sand, as the raw sand of reclaimed sand, can increase the recovery rate of reclaimed sand to more than 90%, which is obviously better than other sand products.

The special sand for 3D printing of Lianxin is precisely the production of northern sand as the original sand, with more prominent advantages. 3D printing is equipped with regeneration process production, which can achieve higher regeneration recovery rate and make enterprises more profitable.

| Lianxin 3D printing sand interface effect

After more than two years of research and development tests, the research and development center of lianxin casting sand group has broken through innovation and solved the problems in the industry. it has created a special high-performance 3D printing sand with excellent performance, stable curing and excellent strength with northern sand as the base material!

| Test effect

1. 3D sand, German sand and domestic quartz sand performance comparison:

2. Wuhan Huaxiang Tengchuang Intelligent Technology Co., Ltd. self-developed domestic equipment, wet printing process.

Test results:Lianxin 3D sand has high strength and fast hardening speed, which meets the requirements of use.

3. Shenyang Foundry Research Institute, VX2000, Germany, dry printing process; The premixed curing agent is placed in a 100% humidity environment for 72 hours and dried for 24 hours.

Test results:Lianxin 3D sand has high strength and fast hardening speed, which meets the requirements of use; the test effect is good.

4. Shenyang Foundry Research Institute, VX2000, Germany, dry printing process; Premixed curing agent is placed for 7 days.

Test results:Lianxin 3D sand has high strength, fast hardening speed and good test results, which meets the requirements of use.

| Case 1: A high-end casting manufacturer in Liaoning

The company is well-known throughout the country, specializing in the production and research and development of high-end casting products, products are mainly used in military, aviation and other high-end fields.

Before the enterprise, it has been using German 3D printing sand. The arrival price of German sand is about 2200 yuan. It will be transported from the port to the enterprise, plus freight.

The company feels that although the price is relatively high, they can add this price to the casting products. Although their casting buyers have also accepted the price at present, the company is still very worried. If the cost of castings of similar quality comes down in the market, they may face the loss of customers.

At the same time, due to overseas procurement of 3D printing sand, to face various uncertainties in the logistics process, and nearly a year of global epidemic, but also really let the enterprise, once because of logistics problems, facing production instability.

When the company learned about the quality of Lianxin 3D printing sand, it invited the first time to try Lianxin 3D printing sand products. After the trial, the indicators are better than the German 3D printing sand. For example, the tensile strength of Lianxin 3D printing sand is higher than that of German sand with the same 1.4% resin and 0.25% curing agent. At the same time, the joint letter 3D printing sand sand uniform, high strength. However, the production base of Lianxin 3D printing sand is located in Zhangwu, Liaoning Province, China, and the supply is very stable.

What satisfies the company most is that the price of Lianxin 3D printing sand is only about half of the price of German 3D printing sand. This has caused the company to worry about the high cost of 3D printing sand, which makes the casting cost high and the cooperation of casting buyers unstable. The doubts have really been fundamentally resolved.

| Case 2: A 3D printing equipment manufacturer in Guangdong

The company is committed to the R & D and manufacturing of 3D printing equipment, the sales of various consumables for 3D printing, and the research and development of 3D printing rapid manufacturing specializing in complex parts. It has provided 3D printing equipment, parts and related products and services to more than 500 domestic enterprises. The industries involved include automobiles, military industry, aerospace, ships, pumps and valves, new energy, diversion transportation, construction machinery, mining machinery and many other fields.

The company used Japanese CB sand before, the quality can be, but the price is as high as about 10000 yuan. Because there was no similar product that could compete with it in China before, I felt that Japan's CB sand was the demand of domestic enterprises and the price was set very high. And this gap between supply and demand, making the price of CB sand in Japan is always high.

For the enterprise, such a high price, but also let the enterprise to open up the market encountered a lot of trouble. Because some foundry companies, due to financial problems, can buy 3D printing equipment, but they can't afford such expensive sand raw materials.

At the same time, the Japanese CB sand from overseas, affected by various factors, the stability of supply has been deeply troubled.

When the enterprise learned that Lianxin Casting Sand Group and Shenyang Foundry Research Institute had jointly developed domestic high-end 3D printing products, it was eager to try Lianxin 3D printing sand products.

The test results show that the tensile strength of Lianxin 3D printing sand is the same as that of CB sand with the same 1.8% resin and 0.45% curing agent. Other indicators are also very good, casting quality is as good as ever.

What the company recognizes most is that the factory price of Lianxin 3D printing sand can reach about 1700 yuan, which reduces the purchase cost of 3D printing sand by more than five times.

This cost reduction makes the company confident in the market expansion of 3D printing equipment. Because, for companies that purchase 3D printing equipment, the sensitivity to the quality and price of the supporting 3D printing sand must be greater than the price sensitivity to 3D printing equipment.

For companies that purchase 3D printing equipment, in future production, the quality and price of 3D printing sand determine the value and profit that the purchase of 3D printing equipment can really create for the company.

At the same time, the stable supply of Lianxin 3D printing sand in China has also made the enterprise confident in its long-term cooperation in using Lianxin 3D printing sand products. Because, Lianxin 3D printing sand has really solved the problem of unstable supply of overseas products before.