CN218983182U

CN218983182U - Manual two-way pipe die

Info

Publication number: CN218983182U
Application number: CN202223329011.3U
Authority: CN
Inventors: 刘明明; 李康; 王丽; 王彬彬
Original assignee: Funik Ultrahard Material Co Ltd
Current assignee: Funik Ultrahard Material Co Ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-09
Anticipated expiration: 2032-12-13

Abstract

The utility model provides a manual bidirectional pipe pressing die which comprises a lower pressing head of a hollow structure, a core rod detachably arranged in the lower pressing head, a female die detachably sleeved at one end of the lower pressing head, a U-shaped die detachably sleeved at the outer side of the lower pressing head and used for supporting the female die, an upper pressing head arranged at one end of the core rod and of the hollow structure, a gasket used for being placed between press columns and limiting the travel of a hydraulic press, and a demolding sleeve movably arranged on the female die, wherein the lower pressing head is provided with a lower pressing head; and the space surrounded by the upper pressure head, the lower pressure head, the female die and the core rod forms a powder pressure pipe forming space. The manual bidirectional pipe pressing die is simple in structure and operation, low in die cost and capable of realizing the bidirectional powder pressing process on the premise of not changing hydraulic equipment.

Description

Manual two-way pipe die

Technical Field

The utility model relates to the field of dies, in particular to a manual bidirectional tube pressing die.

Background

The two most commonly used powder pressing modes in production are one-way pressing and two-way pressing, and pressed compacts obtained by different pressing modes have different density distribution rules. When in unidirectional pressing, the female die is not moved, the lower punch is not moved in the pressing process, only the upper punch moves to apply pressing pressure to the powder, the pressing force is reduced along with the increase of the moving distance of the upper punch due to the friction of the inner wall of the die, and the density of a green body is also reduced along with the reduction of the pressing force, so that the density uniformity of a pressed blank obtained by unidirectional pressing is poor, but the die is simple in structure and convenient to operate, and is widely applied. During bi-directional pressing, the female die is fixed, the upper punch and the lower punch are simultaneously moved and pressurized under the opposite pressure of a certain size direction, the moving distance of the bi-directional pressing upper punch and the bi-directional pressing lower punch is short, and the pressure loss caused by friction in the powder pressing process can be reduced, so that the uniformity of the density of pressed products is ensured. However, there are still many unidirectional pressing devices on the market at present, so on the premise of not changing hydraulic devices, there is an urgent need to provide a manual bidirectional pressing die which is simple to operate and low in cost, and can make up for the shortages of the unidirectional pressing devices.

In order to solve the above problems, an ideal technical solution is always sought.

Disclosure of Invention

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the manual bidirectional pipe pressing die comprises a lower pressing head of a hollow structure, a core rod detachably arranged in the lower pressing head, a female die detachably sleeved at one end of the lower pressing head, a U-shaped die detachably sleeved at the outer side of the lower pressing head and used for supporting the female die, an upper pressing head of the hollow structure arranged at one end of the core rod, a gasket used for being placed between press columns and limiting the travel of a hydraulic press, and a demolding sleeve movably arranged on the female die;

and the space surrounded by the upper pressure head, the lower pressure head, the female die and the core rod forms a powder pressure pipe forming space.

Based on the above, for uniform pressing, the lower ram inner diameter of the hollow structure is equal to the upper ram inner diameter of the hollow structure.

Based on the above, the outer diameter of the lower ram of the hollow structure is equal to the outer diameter of the upper ram of the hollow structure.

Based on the above, in order to facilitate the installation, one side of the U-shaped die is an open U-shaped channel, and the opening width of the U-shaped channel is larger than the outer diameter of the lower pressure head.

Based on the above, in order to facilitate demolding, the demolding sleeve is a hollow demolding sleeve, and the inner diameter of the demolding sleeve is larger than the inner diameter of the female mold.

Based on the above, the length of the core rod is longer than the length of the lower ram.

Compared with the prior art, the manual bidirectional pipe pressing die has the substantial characteristics and progress, particularly, the moving distance of the upper pressing head and the lower pressing head in the pressing process is divided into two parts by utilizing the U-shaped die and the gasket, the problem of overlarge pressing force loss caused by long moving distance of the upper pressing head in unidirectional pressing is avoided, certain displacement and volume shrinkage are generated when two sides of a material to be pressed are pressed in the bidirectional pressing process, the phenomenon of large density difference of two sides of a powder pressing pipe is effectively reduced, the die structure and the operation are simple, the die cost is low, and the bidirectional powder pressing process is realized on the premise that hydraulic equipment is not required to be changed.

Further, the U-shaped die is detachably sleeved below the female die, the U-shaped die can be taken down from the lower pressing head after the die is turned over, the lower pressing head positioned on the upper portion can move downwards under the pressure of the hydraulic press, and therefore one end of a material is pressed by the upper pressing head before the die is turned over, and the material is pressed by the lower pressing head after the die is turned over.

Drawings

Fig. 1 is a schematic diagram of an assembled whole structure of a manual bidirectional pipe pressing die provided by the utility model.

Fig. 2 is a schematic diagram of an assembled front structure of a manual bidirectional pipe pressing die provided by the utility model.

FIG. 3 is a schematic view of a cross-sectional structure of a manual bi-directional pipe pressing die provided by the utility model.

Fig. 4 is a schematic diagram of a U-shaped die structure in a manual bidirectional pipe pressing die.

Fig. 5 is a schematic diagram of a manual bidirectional pipe pressing die in a pressing state after being turned over.

Fig. 6 is a schematic structural view of the manual bidirectional pipe pressing die in a product demoulding state.

In the figure: 1. a press upper cylinder; 2. an upper pressure head; 3. stripping the die sleeve; 4. a female die; 5. a lower pressure head; 6. u-shaped mould; 7. a press lower cylinder; 8. a gasket; 9. a press column; 10. a core rod; 11. a U-shaped channel.

Detailed Description

The technical scheme of the utility model is further described in detail through the following specific embodiments.

Example 1

The embodiment provides a manual two-way pipe pressing die, as shown in fig. 1, 2, 3, 4, 5 and 6, comprising a lower pressing head 5 with a hollow structure, a core rod 10 detachably arranged in the lower pressing head 5, a female die 4 detachably sleeved at one end of the lower pressing head 5, a U-shaped die 6 detachably sleeved at the outer side of the lower pressing head 5 and supporting the female die 4, an upper pressing head 2 with a hollow structure arranged at one end of the core rod 10, a gasket 8 for limiting the travel of a hydraulic press and a demolding sleeve 3 movably arranged on the female die 4.

The space surrounded by the upper pressure head 2, the lower pressure head 5, the female die 4 and the core rod 10 forms a powder pressure pipe forming space.

In this embodiment, for uniform pressing, the inner diameter of the lower ram 5 of the hollow structure is equal to the inner diameter of the upper ram 2 of the hollow structure. The outer diameter of the lower pressure head 5 of the hollow structure is equal to the outer diameter of the upper pressure head 2 of the hollow structure.

As shown in fig. 4, for easy installation, one side of the U-shaped die 6 is provided with an open U-shaped channel 11. The opening width of the U-shaped channel 11 is larger than the outer diameter of the lower pressure head 5. In order to facilitate demolding, the demolding sleeve 3 is a demolding sleeve with a hollow structure, and the inner diameter of the demolding sleeve 3 is larger than the inner diameter of the female mold 4. The length of the core rod 10 is greater than the length of the lower ram 5.

Specifically, the manual bidirectional pipe pressing die provided by the utility model has the following specific operation process:

the lower pressing head is sequentially placed on a plane, the U-shaped die is inserted on the lower pressing head, the female die is placed on the U-shaped die and is inserted on the lower pressing head, the core rod is placed in the inner diameter of the lower pressing head, the heights of the core rod and the female die at the vertical distance are higher than the lower pressing head, and at the moment, an annular groove is formed between the core rod and the female die.

The powder to be pressed is evenly put into the annular groove, the upper pressing head is placed into the annular groove and positioned above the material to be pressed, and the material to be pressed is evenly distributed in the annular groove by rotating clockwise for a few circles while pressing.

Then the whole die is supported and placed between an upper press cylinder 1 and a lower press cylinder 7 of the hydraulic press, a lower pressing head and a core rod are positioned on the upper surface of the lower press cylinder 7, and two gaskets with the thickness of about 3mm to 10mm and equal thickness are respectively placed between two sides of press stand columns 9 connected with the upper press cylinder 1 and the lower press cylinder 7, wherein the thickness of the gaskets is adjusted according to the height of a powder pressing pipe, an upper cylinder descending button is clicked, the upper press cylinder descends and applies downward pressure to the upper pressing head, so that the forming of materials to be pressed is promoted to form a pipe shape.

Because the molding characteristics of one-way pressing, the upper surface density of the powder pressing pipe is greater than that of the lower surface, in order to reduce the density difference between the upper surface and the lower surface, the gaskets on two sides of the U-shaped die and the upright post of the press are firstly taken down from the lower pressing head, then the whole die is turned 180 degrees, the original lower surface of the die is upward, the upper pressing head is positioned on the upper surface of the lower cylinder of the press, and at the moment, the side of the powder pressing pipe with smaller density is upward.

And the lower button of the upper cylinder is clicked again, the upper cylinder of the press moves downwards to apply downward pressure to the lower pressure head, so that the lower surface of the powder pressing pipe is compacted, and the density difference between the upper side and the lower side of the powder pressing pipe is reduced.

Finally, the upper cylinder is lifted, the lower pressure head is taken down from the core rod, the demolding sleeve is placed above the female die, the upper cylinder descending button is clicked again, the upper cylinder of the press applies downward pressure to the demolding sleeve, the demolding sleeve and the female die move downwards relative to the powder pressing pipe, the powder pressing pipe is ejected out of the female die, the core rod is pressed, and the powder pressing pipe is taken out of the core rod to finish demolding.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.

Claims

1. A manual two-way pipe mould that presses, its characterized in that: the device comprises a lower pressure head of a hollow structure, a core rod detachably arranged in the lower pressure head, a female die detachably sleeved at one end of the lower pressure head, a U-shaped die detachably sleeved at the outer side of the lower pressure head and used for supporting the female die, an upper pressure head of the hollow structure arranged at one end of the core rod, a gasket used for being placed between stand columns of a press and limiting the travel of the hydraulic press, and a demolding sleeve movably arranged on the female die;

2. A manual bi-directional pipe die as defined in claim 1 wherein: the inner diameter of the lower pressure head of the hollow structure is equal to the inner diameter of the upper pressure head of the hollow structure.

3. A manual bi-directional pipe die according to claim 1 or 2, wherein: the outer diameter of the lower pressure head of the hollow structure is equal to the outer diameter of the upper pressure head of the hollow structure.

4. A manual bi-directional pipe die as defined in claim 3 wherein: one side of the U-shaped die is provided with an open U-shaped channel, and the width of the opening of the U-shaped channel is larger than the outer diameter of the lower pressure head.

5. The manual bi-directional pipe pressing die according to claim 4, wherein: the demolding sleeve is of a hollow structure, and the inner diameter of the demolding sleeve is larger than that of the female mold.

6. The manual bi-directional pipe pressing die according to claim 5, wherein: the length of the core rod is greater than the length of the lower pressure head.