CN218134960U - Gradual change pressure head of hot pressing sintering - Google Patents
Gradual change pressure head of hot pressing sintering Download PDFInfo
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- CN218134960U CN218134960U CN202222734906.9U CN202222734906U CN218134960U CN 218134960 U CN218134960 U CN 218134960U CN 202222734906 U CN202222734906 U CN 202222734906U CN 218134960 U CN218134960 U CN 218134960U
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Abstract
The utility model discloses a gradual change pressure head for hot pressing sintering, which comprises a pressure head of hot pressing equipment, wherein the end part of the pressure head of the hot pressing equipment is provided with a gradual change pressure head die, the end part of the gradual change pressure head die is provided with a pressure column die, two pressure column dies are inserted into a die sleeve die for hot pressing sintering, and the die sleeve die is internally used for containing powder raw materials; the pressure head of the utility model adopts the continuous gradually-changing diameter pressure head, which can realize the stable transmission of the load to the compression leg and is beneficial to the stable production quality; meanwhile, the continuous gradual-change diameter pressing head is matched with the groove, so that the axial force and the center can be ensured to be on the same axis, and the safety production is facilitated.
Description
Technical Field
The utility model relates to a hot pressing sintering device's technical field specifically is a hot pressing sintering's gradual change pressure head.
Background
The hot-pressing sintering technology is a common molding technology in the powder metallurgy molding technology, and the preparation process comprises the steps of filling powder into a specific mold, generating high temperature through discharge of a pressure head electrode, applying axial or radial pressure to compact the powder in the mold, and sintering and molding. The die mainly comprises a die sleeve and a pressing column.
Because the axial pressure head of the hot-pressing sintering equipment is metal or ceramic (generally columnar) with undetachable and fixed size, and the diameter of the cross section of the pressure head is generally the critical size of a sample formed by hot-pressing sintering; therefore, the diameter of the cross section of the upper pressure head and the lower pressure head of the hot-pressing sintering equipment is generally larger than that of the cross section of the pressing column of the die. Therefore, the direct application of pressure on the surface of the compression leg results in uneven stress on the surfaces of the upper and lower compression heads, and thus, the surfaces of the compression heads are recessed or broken, and the axial force deviates from the axial center and the mold is cracked.
Chinese patent publication No. CN206780611U discloses a multi-level combined graphite mold for hot-press sintering of multi-size samples, in which upper and lower compression columns are designed in a "t" shape to reduce uneven stress on the surfaces of the upper and lower compression heads, thereby achieving the purpose of reducing the diameter from a large diameter. However, when the difference between the diameter of the pressure head and the pressure column is large, the T-shaped pressure column not only increases the preparation cost, but also is easy to deform and break in the assembling process, and the high axial pressure easily causes stress concentration on the top of the T-shaped pressure head to damage equipment.
Chinese patent publication No. CN113001720A discloses a hot-pressing sintering mold and a method for using the same, in which a rigid cushion block is used to realize diameter change, but the contact area between the cushion block surface and a compression column under an axial load is small, and the surface pressure distribution is extremely uneven; when the pressure is too high, the jumping transmission of load can occur, the surface damage is easy to cause, and the service life of the buffer block is reduced; in order to ensure safe production under axial pressure, the size of the rigid cushion block is large, which causes the increase of the cost of the die.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gradual change pressure head of hot pressing sintering has solved among the prior art pressure head to the pressure post mould in the stress inequality that the reducing caused, the mould short-lived and high pressure down load transmission unstable problem.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a gradual change pressure head of hot pressing sintering, includes the hot pressing equipment pressure head, the tip of hot pressing equipment pressure head is provided with gradually reducing pressure head mould, and the tip of gradually reducing pressure head mould is provided with presses the post mould, two it carries out hot pressing sintering to press the post mould to be used for inserting in the die sleeve mould, be used for splendid attire powder raw materials in the die sleeve mould.
Preferably, the gradually-changing diameter pressing head mold is composed of a wide diameter end, a transition area and a narrow diameter end, wherein the wide diameter end comprises a hot pressing head matching surface, a pressing head axis limiting device and a columnar buffer area, the transition area is composed of a gradually-changing diameter transition area, and the narrow diameter end comprises a pressing column mold matching surface and a pressing column axis limiting device.
Preferably, the diameter of the hot pressing head matching surface of the wide-diameter end is larger than that of the pressing head of the hot pressing equipment, the section angle of the gradual change diameter transition area is 60 degrees, and the diameter of the pressing column mould matching surface of the narrow-diameter end is larger than that of the pressing column mould.
Preferably, the contact between hot pressing head fitting surface and the fitting surface of the hot pressing equipment pressure head, spacing cooperation between pressure head axle center stop device and the hot pressing equipment pressure head, cooperation contact between compression leg mould fitting surface and the compression leg mould, spacing cooperation between compression leg axle center stop device and the compression leg mould.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the pressure head of the utility model adopts the continuous gradually-changing diameter pressure head, which can realize the stable transmission of the load to the compression leg and is beneficial to the stable production quality;
2. the utility model provides a continuous gradual change footpath pressure head adopts the recess cooperation, can guarantee that axial force and center are in same axis, is favorable to the safety in production.
Drawings
Fig. 1 is an assembly view of a hot press mold according to the present invention;
fig. 2 is a cross-sectional view of the hot press mold of the present invention;
fig. 3 is a schematic structural view of a gradually-variable-diameter ram mold of the present invention;
fig. 4 is the utility model discloses assemble the structure chart between die sleeve mould and the compression leg mould when feeding in the actual operation process.
In the figure: a pressure head 1 of hot-pressing equipment; a gradually changing indenter die 2; a compression column mold 3; a die sleeve die 4; a powder raw material 5; a hot-pressing head matching surface 6; a pressure head axis limiting device 7; a buffer columnar region 8; a transition zone 9 of gradual change diameter; a press column mould matching surface 10; a compression leg axis limiting device 11; a cushion block 12; a hydraulic press ram 13; a hydraulic press table 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a technical solution: a gradual change pressure head for hot pressing sintering comprises a pressure head 1 of hot pressing equipment, wherein a gradual change pressure head die 2 is arranged at the end part of the pressure head 1 of the hot pressing equipment, a pressure column die 3 is arranged at the end part of the gradual change diameter pressure head die 2, the two pressure column dies 3 are used for being inserted into a die sleeve die 4 for hot pressing sintering, and the die sleeve die 4 is used for containing powder raw materials 5;
the gradually-changing pressing head die 2 is of an integrally-formed structure and comprises a wide-diameter end, a transition area and a narrow-diameter end, wherein the wide-diameter end comprises a hot-pressing head matching surface 6, a pressing head axis limiting device 7 and a columnar buffer area 8, the transition area comprises a gradually-changing diameter transition area 9, and the narrow-diameter end comprises a pressing column die matching surface 10 and a pressing column axis limiting device 11;
the relation between the diameter R6 of the hot pressing head matching surface 6 at the wide-diameter end and the diameter R1 of the hot pressing equipment pressing head 1 is as follows: r6= (R1 + 4) ± 2 mm; the thickness and the height of the pressure head axis limiting device 7 are respectively 5 +/-1 mm; the height of the columnar buffer area 8 is 25 +/-5 mm, and the internal angle of the section of the transition area 9 with the gradually changed diameter is 60 degrees;
the relationship between the diameter R10 of the mating surface 10 of the plunger die at the narrow diameter end and the diameter R3 of the plunger die 3 is: r10= (R3 + 1) ± 0.5 mm, the thickness of the compression leg axis limiting device 11 is 2.5 ± 0.5 mm, and the height is 5 ± 1 mm;
the hot-pressing head matching surface 6 is in contact with the matching surface of the hot-pressing equipment pressing head 1, the pressing head axis limiting device 7 is in limiting matching with the hot-pressing equipment pressing head 1, the pressing head axis limiting device 7 limits the horizontal movement of the hot-pressing equipment pressing head 1 on the surface of the hot-pressing head matching surface 6, and the difference between the diameter of the pressing head matching surface 6 and the diameter of the hot-pressing equipment pressing head 1 is in size so as to adapt to the thermal expansion and cold contraction of the pressing head and a die in a high-temperature and high-pressure state;
the press column mould matching surface 10 is in matching contact with the press column mould 3, the press column axis limiting device 11 is in limiting matching with the press column mould 3, the press column mould 3 is limited by the press column axis limiting device 11 to move horizontally on the surface of the press column mould matching surface 10, the difference between the diameter of the press column mould matching surface 10 and the diameter of the press column mould 3 is in size to adapt to the expansion and contraction of the mould under the high-temperature and high-pressure state, the press head axis limiting device 7 and the press column axis limiting device 11 act simultaneously, and the coincidence of the axial force and the axis is simply and accurately realized;
through the axle center limiting device and the continuous gradual change diameter conversion system, the problems of uneven stress, short service life of the die and unstable load transfer under high pressure caused by the deviation of the axle center and the axial force and the discontinuous diameter change in the pressing head-pressing column die in the prior art are solved;
the transition from a wide-diameter area to a narrow-diameter area of the die is realized through a geometrical figure continuous transition area 9 with gradually changed diameter; referring to the geometric symmetry of an equilateral triangle, in order to realize uniform distribution and stable transmission of stress, the internal angle of the section of the transition region 9 with gradually changed diameter is selected to be 60 degrees; the geometric symmetry and continuity of the transition region 9 with gradually changed diameter can realize the continuous and stable transfer of load;
in actual use, the method is realized by the following steps:
(1) Charging: as shown in fig. 4, firstly, the lower compression column mold 3 is inserted into the die sleeve mold 4 on the laboratory hydraulic machine workbench 14, and is supported around the bottom of the die sleeve mold 4 by the cushion block 12, so as to support the die sleeve mold 4, then the powder raw material 5 is filled into the die sleeve mold 4 and is positioned at the central position of the die sleeve mold 4, finally, the upper compression column mold 3 is inserted into the die sleeve mold 4, then the hydraulic machine is started, after the hydraulic machine pressure head 13 abuts against the upper compression column mold 3 to compact the powder, a certain force (similar to the principle of an expansion screw) is formed between the compacted powder raw material 5 and the die sleeve mold 4 due to the huge pressure effect, and after the cushion block 12 is removed, an integrated structure is formed between the die sleeve mold 4 and the compacted powder raw material 5 due to the force effect.
(2) Assembling: assembling a press column die matching surface 10 of the gradually-changing press head die 2 with the press column die 3, then assembling a press head matching surface 6 of the gradually-changing press head die 2 with a press head 1 of hot-pressing equipment, wherein the assembling result is shown in figure 1, and setting parameters for sintering.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a gradual change pressure head of hot pressing sintering, includes hot pressing equipment pressure head (1), its characterized in that: the end part of the hot pressing equipment pressing head (1) is provided with a gradually-changing pressing head die (2), the end part of the gradually-changing pressing head die (2) is provided with a pressing column die (3), the two pressing column dies (3) are used for being inserted into a die sleeve die (4) for hot-pressing sintering, and the die sleeve die (4) is internally used for containing powder raw materials (5).
2. The progressive ram for hot press sintering of claim 1, wherein: gradually reducing pressure head mould (2) are held, transition zone, narrow footpath end by the broad diameter and are constituteed, and the broad diameter end contains hot pressing pressure head fitting surface (6), pressure head axle center stop device (7) and column buffer (8), and the transition zone comprises gradually reducing transition zone (9), and the narrow footpath end contains compression column mould fitting surface (10) and compression column axle center stop device (11).
3. The progressive head for hot press sintering of claim 2, wherein: the diameter of the hot pressing head matching surface (6) at the wide diameter end is larger than that of the hot pressing equipment pressing head (1), the section angle of the gradual change diameter transition area (9) is 60 degrees, and the diameter of the pressing column die matching surface (10) at the narrow diameter end is larger than that of the pressing column die (3).
4. The progressive head for hot press sintering of claim 2, wherein: the hot-pressing device is characterized in that a hot-pressing head matching surface (6) is in contact with a matching surface of a hot-pressing device pressing head (1), a pressing head axis limiting device (7) is in limiting fit with the hot-pressing device pressing head (1), a pressing column die matching surface (10) is in matching contact with a pressing column die (3), and a pressing column axis limiting device (11) is in limiting fit with the pressing column die (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222734906.9U CN218134960U (en) | 2022-10-17 | 2022-10-17 | Gradual change pressure head of hot pressing sintering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222734906.9U CN218134960U (en) | 2022-10-17 | 2022-10-17 | Gradual change pressure head of hot pressing sintering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218134960U true CN218134960U (en) | 2022-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222734906.9U Active CN218134960U (en) | 2022-10-17 | 2022-10-17 | Gradual change pressure head of hot pressing sintering |
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| Country | Link |
|---|---|
| CN (1) | CN218134960U (en) |
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- 2022-10-17 CN CN202222734906.9U patent/CN218134960U/en active Active
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