CN-121373416-B - Powder metallurgy compacting die convenient to ejection of compact

CN121373416BCN 121373416 BCN121373416 BCN 121373416BCN-121373416-B

Abstract

The invention relates to the technical field of pressing dies, in particular to a powder metallurgy pressing die convenient for discharging, which comprises a base, a lower die and an upper die which are sequentially distributed from bottom to top, wherein a plurality of upright posts are vertically arranged on the top surface of the base, the lower die is fixedly connected with the upright posts, the upper die is in sliding fit with the upright posts, a forming channel is arranged in the middle of the top surface of the lower die in a penetrating way, a core block capable of sliding vertically is arranged in the forming channel, and a demoulding assembly is arranged on the core block.

Inventors

He Bangcheng
ZENG NANQIANG
YE PEIJUN
CHEN HAICHAO
SU RUIHENG
LI BIAO

Assignees

广东省川源精密模具有限公司

Dates

Publication Date: 20260508
Application Date: 20251117

Claims (7)

1. The utility model provides a powder metallurgy compacting tool set convenient to ejection of compact, includes base, lower mould and the last mould that distributes in proper order from bottom to top, the top surface of base is equipped with many stands perpendicularly, lower mould and stand fixed connection, go up mould and stand sliding fit, its characterized in that: a forming channel is arranged in the middle of the top surface of the lower die in a penetrating way, and a core block capable of sliding vertically is arranged in the forming channel; An upper module is arranged on the bottom surface of the upper die and opposite to the forming channel, and after the upper module stretches into the forming channel, the upper module and the core block can jointly press powder into blocks; The upper surface of the core block is provided with an annular demolding cavity, a demolding assembly is arranged in the demolding cavity, and the top surface of the demolding assembly is flush with the upper surface of the core block in a powder pressing state; The core block is also provided with a demolding driving assembly, and the demolding driving assembly is used for controlling the demolding assembly to rotate and then lift in the process of lifting up the core block, so that a pressed product can be separated from the core block; the demolding assembly comprises a rotating part and a lifting part, wherein the rotating part and the lifting part are all in an annular shape, and a plurality of telescopic assemblies are arranged between the rotating part and the lifting part; the outer surface of the lifting part is provided with a convex column, the inner surface of the demolding cavity is provided with a sliding groove for embedding the convex column, the sliding groove comprises a horizontal section and a spiral section, when the convex column is positioned in the horizontal section, the top surface of the lifting part is flush with the upper surface of the core block, and when the convex column enters the spiral section, the top surface of the lifting part is higher than the upper surface of the core block; the core block is internally provided with a mounting groove communicated with the demolding cavity, and one surface of the rotating part, which is opposite to the mounting groove, is provided with a driven gear ring; the demolding driving assembly comprises a driving gear which is rotatably arranged in the mounting groove and meshed with the driven gear ring, an extension hole communicated with the mounting groove is further formed in the bottom of the core block, a main shaft is rotationally arranged in the extension hole, the top end of the main shaft is coaxially connected with the driving gear, and the bottom end of the main shaft extends out of the lower portion of the extension hole; the demolding driving assembly further comprises a retainer arranged on the bottom surface of the core block, a retainer rod is arranged in the retainer in a vertical sliding mode, a spiral groove is formed in the outer surface of the bottom of the main shaft, an adjusting groove is formed in one side of the inner wall of the molding channel in a vertical mode, and two ends of the retainer rod are respectively embedded into the spiral groove and the adjusting groove; And when the core block is propped up upwards, the retaining rod can move downwards along the spiral groove when the top end in the adjusting groove is propped against the retaining rod, so that the demolding assembly rotates.
2. The powder metallurgy pressing die facilitating discharging according to claim 1, wherein a core rod is vertically arranged on the top surface of the base, and the top end of the core rod extends into the forming channel and is flush with the top surface of the lower die.
3. The powder metallurgy pressing die convenient to discharge according to claim 1 or 2 is characterized in that a bottom cover is arranged at the bottom end of the forming channel, and a pulling spring which is always in a stretching state is connected between the bottom cover and the core block; The bottom cover is arranged on the lower die, a pushing part is arranged between the base and the lower die, a pushing column and a pulling column are vertically arranged on the top surface of the pushing part, the top end of the pushing column penetrates through the bottom cover and stretches into the forming channel, the top end of the pushing column is abutted against the bottom surface of the core block, the pulling column penetrates through the lower die, and the top end of the pulling column is connected with the upper die through a pulling rope.
4. The powder metallurgy pressing die convenient to discharge according to claim 1, wherein hidden cavities are symmetrically formed in the positions, close to edges, of the two opposite sides of the upper surface of the core block, lifting blocks are embedded in the hidden cavities, and when the lifting blocks are completely embedded in the hidden cavities, the top surfaces of the lifting blocks are flush with the upper surface of the core block.
5. The powder metallurgy pressing die convenient to discharge according to claim 4, wherein a communication groove is formed between the hidden cavity and the demolding cavity in a penetrating mode, a linkage rod is arranged on the jacking block, an annular driving groove is formed in the outer surface of the lifting portion, and one end of the linkage rod penetrates through the communication groove and stretches into the driving groove.
6. The powder metallurgy pressing die facilitating discharging according to claim 1, wherein a rotary seat cover is arranged at the bottom end of the extension hole, and the main shaft is in rotary fit with the rotary seat cover.
7. The powder metallurgy pressing die facilitating discharging according to claim 5, wherein the outer surface of the core block is provided with mounting holes communicated with the hidden cavity, the mounting holes are opposite to the communicating grooves, and the linkage rod is inserted into the jacking block through the mounting holes and is fixedly connected with the jacking block through threads.

Description

Powder metallurgy compacting die convenient to ejection of compact Technical Field The invention relates to the technical field of pressing dies, in particular to a powder metallurgy pressing die convenient to discharge. Background The powder metallurgy technology is used as a high-efficiency and energy-saving material preparation process and is widely applied to the fields of automobiles, aerospace, electronics and the like, one of the key links is that powder is pressed into blanks with specific shapes and densities through pressing dies, and compared with the traditional casting mode, the powder metallurgy technology has higher production efficiency. Existing powder metallurgy pressing molds generally have an upper mold, a lower mold, a forming cavity located on the top surface of the lower mold, and an ejection mechanism located in the forming cavity. In the specific working process, firstly, quantitative powder is poured into a forming cavity by a machine or manually, then, a hydraulic mechanism is used for controlling a lower die to be pressed down, the lower die is embedded into the forming cavity, and finally, the powder is pressed and formed under the action of up-down extrusion force. After the pressing is finished, the ejection mechanism can eject the molded product out of the molding cavity upwards, at the moment, the product can be taken out by a machine or a person, and then the ejection mechanism descends again to retract to the original position for the next continuous use. It should be noted that, although the pressing mold is convenient and efficient to use, the pressed product is not firm, and a high-temperature sintering treatment is required, otherwise, the formed product is likely to be broken as soon as the product is broken. In the process, after the powder is poured into the forming cavity, the powder falls on the ejection mechanism, and then under the pressing action of the upper die, the formed product can be tightly adhered to the upper surface of the ejection mechanism, so that certain resistance is brought to the material taking process. Specifically, although the upper surface of the ejection mechanism is smooth, a certain adhesive force may exist between the molded product and the upper surface of the ejection mechanism due to huge pressing force, and if the molded product is strongly buckled by external force, the surface of the molded product may be damaged due to uneven stress of the molded product. Therefore, the invention provides a powder metallurgy pressing die which is convenient for discharging so as to well solve the defects. Disclosure of Invention The invention aims to provide a powder metallurgy pressing die convenient for discharging, which is used for solving the problem that the demoulding difficulty is possibly caused by overlarge product binding force in the demoulding process of the formed product. The invention is realized by the following technical scheme that the powder metallurgy pressing die convenient for discharging comprises a base, a lower die and an upper die which are sequentially distributed from bottom to top, wherein the top surface of the base is vertically provided with a plurality of upright posts, the lower die is fixedly connected with the upright posts, the upper die is in sliding fit with the upright posts, a forming channel is penetrated and arranged in the middle position of the top surface of the lower die, and a core block capable of sliding vertically is arranged in the forming channel; An upper module is arranged on the bottom surface of the upper die and opposite to the forming channel, and after the upper module stretches into the forming channel, the upper module and the core block can jointly press powder into blocks; The upper surface of the core block is provided with an annular demolding cavity, a demolding assembly is arranged in the demolding cavity, and the top surface of the demolding assembly is flush with the upper surface of the core block in a powder pressing state; And the demolding driving assembly is used for controlling the demolding assembly to rotate and then lift in the process of lifting the core block upwards, so that a pressed product can be separated from the core block. Optionally, the top surface of base is equipped with the plug perpendicularly, the top of plug stretches into in the shaping passageway and with the top surface parallel and level of lower mould. Optionally, a bottom cover is arranged at the bottom end of the forming channel, and a pulling spring which is always in a stretching state is connected between the bottom cover and the core block; The bottom cover is arranged on the lower die, a pushing part is arranged between the base and the lower die, a pushing column and a pulling column are vertically arranged on the top surface of the pushing part, the top end of the pushing column penetrates through the bottom cover and stretches into the forming channel, the top end of the pushing colum