Wuxi IDEAL Machinery Manufacturing Co., Ltd. is discussing with you about the manufacturer of shot blasting machine: how to select the correct steel sand.

Manufacturer of shot blasting machine: when selecting the size of steel shot, try to select larger steel shot as far as possible under the condition of meeting the requirements of surface precision to advance the clearing power,.

Use graded steel shot. The graded steel shot is composed of about 50% of the surface size steel shot and gradually smaller steel shot, which integrates the impact force and coverage rate, and can lose high clearing power and low surface precision (compared with the steel shot with complex grain size). When clearing the car cylinder block, the original s550 (~1.5mm) steel shot with complex grain size was used, the processing time was 60s, and the surface precision value was R, 15~25ttm, instead of being used

After the graded steel shot of $460 (1.2mm), the clearing time is 55s, and the surface precision value is R. 12.5-20urn，

In the process of consumption, each steel shot is a process of wear and tear from time to time, so the grain size of each steel shot is changing from time to time. Because the hot spots change with the size of the steel shot, in order to ensure that the hot particle size/ram ratio gradually tends to the general curve. If too much material is added at one time, the casting surface will become precise immediately; In the long run, no material will be added. Although the surface quality of the casting has improved earlier, the clearing power will be greatly reduced.

2. The essence of clearing time is to remove the sand and oxide scale on the surface of the casting and restore the surface of the casting, instead of changing the surface precision of the casting with a long time of clearing. The method of trying to use shot blasting clearing to obtain a lower surface precision value is inappropriate, which not only increases the power, but also adds the cost. It is necessary to improve the quality of the following processes, such as increasing the grain size of molding and core-making sand, The application of high-quality coating, improvement of molding sand quality, etc., and liquidation are related to the raw materials and original surface conditions of castings. For example, the raw materials of general automobile cylinder block are HT250, hardness HB200-210, and liquidation by using+(+squirrel-cage shot blasting machine. It only takes 55s; while the raw materials of camshaft are chilled alloy cast iron, hardness reaches HRC48, and the room liquidation time is 15~20min/hook by using O378 single-hook shot blasting.

Liquidation. To remove the sand and gasification skin on the surface of the casting, it is sufficient to show the metal body. Assuming that the liquidation continues, it can change the original metal surface of the casting and make R dry to a certain value (related to the grain size of the steel shot), (a) the hot spot of the graded steel shot, (b) the grain size of the steel force becomes smaller and hot

The impact point of the change of the grain size of the left-moving steel handle on the door handle remains unchanged. It is necessary to ensure that the mixing ratio of the steel shot, i.e. the gradation, remains unchanged

Precise and talented to ensure the power of basket cleaning. In the process of consumption, not only should we often review the mixing ratio of mixed steel shot in the way of parts, but also

Pay special attention to the method of making up the steel shot. According to the consumption of the steel shot, we can make up the feeding automatically in time. We use the method of making up the feeding every day in our consumption. Each time we make up the feeding does not exceed 10% of the total amount, and always insist that the steel shot in the hopper is full, so as to ensure the grade of the steel shot

The same base ensures a certain popular position, namely the clearing power, and the shaking of the casting's clearing quality. Assuming that the grain size of graded steel shot develops in a small direction, it is necessary to prove that the filling period is long; On the contrary, it is necessary to extend the feeding cycle. In summary, the grade of steel shot should be t.71.18850.60.420. 30, 21 grain size/ram (c) steel shot grain size becomes larger, and it is not cost-effective to move the hot right.

3. Conclusion (1) In the process of consumption, accurate adjustment and frequent review of the hot shot, ensuring the general task of the shot and sand separator, ensuring sufficient sand volume, restricting the development of shot blasting, and the power of the machine are the key elements to ensure the clearing power and waste of capital.

(2) Make up for feeding on time, so that each feeding does not exceed 10% of the total amount of steel shot. In the process of consumption, the grain size distribution of steel shot is often reviewed to ensure that the grain size distribution of steel shot remains unchanged, so as to ensure the fluctuation of clearing power and casting surface quality,

(3) Liquidation. It is only necessary to remove the sand and oxide scale and show the heavy metal body. While extending the liquidation process can change the surface precision of the casting, it increases the power and adds the cost.

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