A low flow material compression molding process

Abstract

The present application relates to a kind of low flowability material press forming process, the hydraulic press is dry powder hydraulic press, and hydraulic forming die is installed on it;The hydraulic forming die is composed of upper die punch, female die, lower die punch, core rod;Its characterized in that, the inner hole upper end of the upper die punch is equipped with air gun;The process steps are as follows: 1) female die, lower die punch, core rod are in starting position, i.e. demoulding position, female die upper mouth, lower die punch upper end, core rod upper end are flush;2) feeding;3) pressing;Demoulding;When feeding: female die rises to the set feeding height, material is added to female die, then upper die punch descends into female die, blocks female die upper mouth, air gun sprays air to female die cavity, when spraying, core rod rises, when core rod rises to feeding position, i.e. the upper end of core rod is flush with female die upper mouth, air gun ends spraying, and feeding ends.Gas gun is used to spray air, to forcibly realize the flow of low flowability material, avoid manual handling.

Description

TECHNICAL FIELD

[0001] The present application relates to dry powder compression molding technology, in particular to a low flowability material compression molding process. BACKGROUND

[0002] For low flowability materials, such as certain materials used in the magnetic material industry and the sealing industry contain a certain proportion of water and liquid chemical raw materials, the materials do not flow at all, and the products also have the characteristics of being thin and long. The traditional method of vibrating the core rod is not suitable, so after adding the materials, manual processing (stirring rod stirring) is required, which is unsafe and low in efficiency. SUMMARY

[0003] To solve the above problems, the present application provides a low flowability material compression molding process, supplemented by an automatic material weighing and adding device to realize automatic material adding of low flowability materials.

[0004] The technical scheme of the present application is as follows:

[0005] A hydraulic machine for hydraulic forming of low flowability materials, the hydraulic machine is a dry powder hydraulic machine, a hydraulic forming die is installed on the dry powder hydraulic machine; the hydraulic forming die is composed of an upper punch, a female die, a lower punch and a core rod; a gas gun is installed on the inner hole of the upper punch;

[0006] The upper punch blocks the upper opening of the female die, the lower punch and the core rod block the lower opening of the female die, and the gas gun sprays gas into the female die cavity to drive the material in the female die cavity to flow.

[0007] The upper end of the core rod is a mushroom-shaped round head.

[0008] A compression molding process using the above-mentioned hydraulic machine for hydraulic forming of low flowability materials; the process steps are as follows: 1) the female die, the lower punch and the core rod are in the starting position, i.e. the demolding position, and the upper opening of the female die, the upper end of the lower punch and the upper end of the core rod are flush; 2) adding material; 3) compression; 4) demolding; when adding material, the female die is raised to a set material adding height, the material is added into the female die, then the upper punch is lowered into the female die to block the upper opening of the female die, the gas gun sprays gas into the female die cavity, and when spraying gas, the core rod rises, when the core rod rises to the material adding position, i.e. the upper end of the core rod is flush with the upper opening of the female die, the gas gun stops spraying gas and the material adding is completed.

[0009] When compressing, the upper punch continues to descend "back pressure" until "pressure holding" is completed when the upper punch is lowered to a set compression height;

[0010] When the upper punch is descending, the lower punch is fixed and the female die is descending (according to the principle of relative movement of objects, the descending of the female die is regarded as being fixed and the lower punch is ascending), and the upper punch and the lower punch form "bidirectional floating compression".

[0011] As the upper die punch descends, the mandrel descends slowly, creating an "asynchronous floating pressure" with the lower die punch.

[0012] The air gun fires intermittently.

[0013] The advantages of this invention are that it is reasonably designed and ingeniously conceived. The addition of an air gun allows for the forced flow of low-flow materials by air jetting, thus avoiding manual handling. Furthermore, it improves the material feeding process by first sealing the upper opening of the female mold with the upper die punch during air jetting, otherwise material splashing in the female mold cavity would inevitably occur. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of a hydraulic press used for hydroforming of low-flow materials.

[0015] Fig. 2 This is a schematic diagram of a hydraulic forming mold (initial position / demolding position).

[0016] Fig. 3 This is a diagram illustrating the process of adding ingredients.

[0017] The diagram shows: upper die punch 1, female die 2, lower die punch 3, mandrel 4, mushroom-shaped round head 4-1, and air gun 5. Detailed Implementation

[0018] like Figs. 1-3 As shown, a hydraulic press for hydroforming low-flowability materials is disclosed. The hydraulic press is a dry powder hydraulic press, on which a hydroforming mold is mounted. The hydroforming mold consists of an upper die punch 1, a female die 2, a lower die punch 3, and a mandrel 4. An air gun 5 is mounted on the upper end of the inner hole of the upper die punch 1.

[0019] The upper die punch 1 blocks the upper opening of the female die 2, the lower die punch 3 and the mandrel 4 block the lower opening of the female die 2, and the air gun 5 sprays air into the cavity of the female die 2, causing the material in the cavity of the female die 2 to flow.

[0020] The upper end of the core rod 4 is a mushroom-shaped round head 4-1;

[0021] A compression molding process using the aforementioned hydraulic press for hydraulic molding of low-flow materials; the process steps are as follows: 1) The female mold 1, lower die punch 2, and mandrel 4 are in the starting position, i.e., the demolding position, with the upper opening of the female mold 1, the upper end of the lower die punch 3, and the upper end of the mandrel 4 aligned; 2) feeding; 3) pressing; 4) demolding; During feeding, the female mold 2 rises to the set feeding height, and the material is added into the female mold 2. Then, the upper die punch 1 descends into the female mold 2, sealing the upper opening of the female mold 2. The air gun 5 sprays air into the cavity of the female mold 2. During air spraying, the mandrel 4 rises. When the mandrel 4 rises to the feeding position, i.e., when the upper end of the mandrel 4 is aligned with the upper opening of the female mold 2, the air gun 5 stops spraying, and the feeding ends;

[0022] When the upper punch 1 is descending to the set pressing height, the upper punch 1 continues to descend "post-pressing" until "pressure maintaining" to complete the pressing;

[0023] When the upper punch 1 is descending, the lower punch 3 is fixed, and the female die 2 is descending to form "two-way floating pressing" with the upper punch 1;

[0024] When the upper punch 1 is descending, the core rod 4 is slowly descending to form "asynchronous floating pressing" with the lower punch 3;

[0025] The air gun 5 is intermittently jetting air.

[0026] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A compression molding process for a low-flowability material, wherein the process employs a dry powder hydraulic press, the dry powder hydraulic press being equipped with a hydraulic forming mold; the hydraulic forming mold comprises an upper punch, a female mold, a lower punch, and a mandrel; characterized in that, An air gun is installed at the upper end of the inner hole of the upper die punch; The process is as follows: 1) The female mold, lower die punch, and mandrel are in the starting position, i.e., the demolding position, with the upper opening of the female mold, the upper end of the lower die punch, and the upper end of the mandrel flush; 2) Material feeding; 3) Pressing; 4) Demolding; During material feeding, the female mold rises to the set feeding height and the material is added into the female mold. Then, the upper die punch descends into the female mold, sealing the upper opening of the female mold. An air gun sprays air into the female mold cavity. During air spraying, the mandrel rises. When the mandrel rises to the feeding position, i.e., when the upper end of the mandrel is flush with the upper opening of the female mold, the air gun stops spraying, and material feeding ends; During pressing, when the upper die punch descends to the set pressing height, the upper die punch continues to descend and press until the pressure is held, completing the pressing; When the upper die punch descends, the lower die punch remains stationary, and the female mold descends, forming a bidirectional floating pressing with the upper die punch. When the upper die punch descends, the mandrel descends slowly, forming an asynchronous floating pressing with the lower die punch.

2. The low-flowability material compression molding process according to claim 1, characterized in that, The upper end of the core rod has a mushroom-shaped round head.

3. The low-flowability material compression molding process according to claim 1, characterized in that, The air gun fires intermittently.

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