RU187936U1 - Mold for pressing carbon-graphite powder products - Google Patents

Abstract

The mold for powder pressing relates to the field of engineering, in particular to the design of devices for pressing powder. The mold consists of the upper 1 and lower 2 punches mounted on the housing 3 and the floating matrix 4. In the lower part of the housing 3 there are two hydraulic cylinders 5. On the rods 6 of the hydraulic cylinder 5 there is a ratchet dog 7. In this case, the gear wheel 8 of the ratchet mechanism is mounted on a shaft 9 mounted on the housing. Also, a crank 10 is mounted on the shaft 9, connected by means of a connecting rod 11 with a floating matrix 4.

The simplified design of the mold ensures in one working stroke both the powder pressing and the ejection of the product. Access to the pressed product is simplified, which simplifies the automation process.

Description

The utility model relates to the field of engineering, in particular to the design of molds for pressing powders.

A known stamp for the manufacture of core products with a thickening, containing a rigid base on which are mounted a fixed container and an ejector, a floating die, a spring-loaded punch (RF Patent for Utility Model No. 98957, Stamp for the manufacture of core products with a thickening, IPC B21J 13/02, from 11/10/2010). In the working space of the container is an elastic element made in the form of a compression spring or representing compressed air or hydraulic fluid. The stamp has a system of channels ending with a fitting and a control system with instrumentation.

The disadvantage of this stamp is the complexity of the design.

The closest in technical essence and the achieved effect to the proposed is a mold for pressing powders containing a housing, upper and lower punches, a floating die (RF Patent for invention No. 2279949, Monoblock mold, IPC B22F 3/03, B30V 15/02 , 07/20/2006). The mold has a loading plate. The housing contains the lower and upper base and intermediate plates connected by columns. Each column is provided with a shoulder. Between the collars of the columns and the lower base plate installed elastic elements. At the end of the pressing, the upper pressing punch, the floating die and the lower pushing punch move up and the product is pushed out. Hence, the mechanism of pushing the product and returning the matrix to its original position is made in the form of a lower pushing punch and elastic elements.

The disadvantage of this mold is the design complexity due to the complexity of the mechanism of ejecting the product and returning the floating matrix to its original position. The specified mold is characterized by the complexity of maintenance due to design features. In the design of the mold, it is difficult to select the characteristics of the elastic elements, taking into account deformations. The kinematic diagram of the mold assumes during its operation the complexity of loading the powder into the matrix due to the need to create a single plane between the plates and the matrix. The complexity of the design makes it difficult to access the molded product, which complicates the automation of the process.

The technical problem is the creation of a high-performance mold while ensuring reliability and ease of maintenance.

The technical result of the proposed solution is to simplify the design.

The technical result in the proposed solution is achieved by the fact that in the mold for pressing powder products, comprising a housing, upper pressing and lower punches mounted on the housing, a floating die and a mechanism for pushing the product out of the die and returning it to its original position, according to the proposed solution, the ejection mechanism consists of two hydraulic cylinders installed in the lower part of the housing, each of which is equipped with a ratchet mechanism containing a shaft mounted in the housing, a gear wheel placed on the shaft y, and a dog mounted on the hydraulic cylinder rod, and a crank mechanism containing a crank mounted on the said shaft, and a connecting rod connected to the floating matrix with the possibility of its forward movement downward when the ratchet dog is engaged with the gear wheel and torque is transmitted to the crank .

The supply of the mold with a ratchet mechanism and a crank mechanism allows to simplify the mechanism of pushing the product and returning the floating matrix to its original position while providing a rigid kinematic connection. This allows you to reduce the number of complex structural parts. The design of the mold provides for one working stroke, both the pressing of the powder and the expulsion of the product. Access to the pressed product is simplified, which simplifies the automation process.

The proposed mold is illustrated in FIG. 1, 2, where in FIG. 1 shows a kinematic diagram of a mold; FIG. 2 is a section AA of FIG. one.

The mold consists of the upper 1 and lower 2 punches mounted on the housing 3 and the floating matrix 4. In the lower part of the housing 3 there are two hydraulic cylinders 5. On the rods 6 of the hydraulic cylinder 5 there is a ratchet dog 7. In this case, the gear wheel 8 of the ratchet mechanism is mounted on a shaft 9 mounted on the housing. Also, a crank 10 is mounted on the shaft 9 connected by means of a connecting rod 11 with a floating matrix 4.

The proposed mold works as follows.

Turn on the mold drive (not shown in the drawing). The upper punch 1 moves down and forms an article of powder in the cavity of the matrix 4. After molding the article, the upper punch 1 begins to move up. In this case, the rods 6 of the hydraulic cylinders 5 installed in the housing 3 also move up. At the same time, the dog 7 of the ratchet mounted on the rods 6 is engaged with the gear wheel 7 of the ratchet mechanism. The torque through the shaft 9 is transmitted to the crank 10. The rotational movement from the crank 10 through the connecting rod 11 is converted into the translational motion of the floating matrix 4. It moves down, releasing the molded product located on the lower punch 2.

A working draft of the proposed mold has been developed. The mold is designed to produce products from carbon-graphite materials. A working draft of the proposed mold with a crank radius of 75 mm and a ratchet wheel with a pitch circle diameter of 40 mm has been developed.

The proposed mold will find application in pressing powder, mainly carbon graphite powders.

Claims (1)

A mold for pressing carbon-graphite powder products, comprising a housing, upper pressing and lower punches mounted on the housing, a floating die and a mechanism for pushing the product out of the matrix and returning it to its original position, characterized in that the pushing mechanism consists of two mounted in the lower part the housing of the hydraulic cylinders, each of which is equipped with a ratchet mechanism containing a shaft mounted in the housing, a gear placed on the shaft, and a dog mounted on the rod of the hydraulic cylinder, and a crank an o-crank mechanism containing a crank mounted on said shaft and a connecting rod connected to a floating matrix with the possibility of its translational movement downward when the ratchet dog is engaged with a gear wheel and torque is transmitted to the crank.

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