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CN-224215845-U - Graphite cushion block for hot-press sintering furnace

CN224215845UCN 224215845 UCN224215845 UCN 224215845UCN-224215845-U

Abstract

The utility model provides a graphite cushion block for a hot-press sintering furnace, which comprises a graphite cushion block, wherein the graphite cushion block is correspondingly arranged at the upper end and the lower end of a sintering mold and is arranged between the sintering mold and an electrode block, the graphite cushion block comprises a flat cushion block and a hollow heat conducting block, the flat cushion block is symmetrically arranged at the upper end and the lower end of the sintering mold, the hollow heat conducting block is clamped between the corresponding flat cushion block and the electrode block, a hollow area is arranged in the middle of the hollow heat conducting block along the vertical axial direction, and the induced current can be led to flow along the periphery of the flat cushion block preferentially by adjusting the thickness of the hollow heat conducting block and the width of the hollow area so as to balance the temperature difference between the core part and the periphery of the sintering mold. According to the utility model, the hollow heat conducting block is additionally arranged between the flat pad block and the electrode block, so that the induced current is led to flow from the periphery preferentially, the heating effect and the temperature effect of the periphery of the die are increased, the conduction of the core induced current is reduced, and the temperature difference caused by heat loss of the periphery due to contact with the outside is balanced.

Inventors

  • LI FAN
  • WANG TAO
  • ZHEN CHUNGANG
  • WU HAOXUAN

Assignees

  • 长沙百通新材料科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250415

Claims (7)

  1. 1. The graphite cushion block for the hot-press sintering furnace comprises a graphite cushion block (1), wherein the graphite cushion block (1) is respectively and correspondingly arranged at the upper end and the lower end of a sintering die (2) and is respectively arranged between the sintering die (2) and an electrode block (3), and the graphite cushion block is characterized in that: Graphite cushion (1) is including flat cushion (11) and hollow heat conduction piece (12), flat cushion (11) symmetry sets up the upper and lower both ends at sintering mould (2), hollow heat conduction piece (12) clamp is located between flat cushion (11) and electrode piece (3) that correspond, the middle part of hollow heat conduction piece (12) is equipped with hollow region (14) along vertical axial to can be through the thickness of adjusting hollow heat conduction piece (12) and the width of hollow region (14), guide induced current preferentially along flat cushion (11) peripheral flow, balance sintering mould (2) core and temperature difference all around.
  2. 2. The graphite cushion block for hot-press sintering furnace as set forth in claim 1, wherein the hollow area (14) is square in shape, the hollow heat conducting block (12) is of a hollow structure in a shape like a Chinese character 'hui', and the size of an inner frame of the hollow heat conducting block (12) is matched with the size of a die cavity of the sintering die (2).
  3. 3. The graphite cushion block for hot-press sintering furnace, as set forth in claim 2, characterized in that the size of the inner frame of the hollow heat conducting block (12) can be adjusted by nesting hollow adjusting blocks (13) with different sizes, the thickness of the hollow adjusting blocks (13) is the same as the thickness of the hollow heat conducting block (12), and the hollow adjusting blocks (13) are made of graphite materials.
  4. 4. The graphite cushion block for the hot-press sintering furnace, as set forth in claim 3, characterized in that a plurality of uniformly distributed positioning protrusions (131) are arranged on the outer side surface of the hollow adjusting block (13), positioning grooves (121) are arranged at positions, corresponding to the positioning protrusions (131), of the inner frame of the hollow heat conducting block (12), and the hollow adjusting block (13) is nested in the inner frame of the hollow heat conducting block (12) through the matching of the positioning protrusions (131) and the positioning grooves (121).
  5. 5. The graphite cushion block for the hot-press sintering furnace, as set forth in claim 2, characterized in that the hollow heat conducting block (12) is formed by stacking a plurality of heat conducting plates (122), the thickness of the hollow heat conducting block (12) can be adjusted by increasing or decreasing the number of the heat conducting plates (122), and the adjacent heat conducting plates (122) are connected through graphite adhesive or mortise-tenon structure.
  6. 6. The graphite cushion block for hot-press sintering furnace, as set forth in claim 5, characterized in that the upper edge of the outer side of the heat conducting plate (122) is provided with an annular protective convex edge (4), the height of the protective convex edge (4) is smaller than the thickness of the heat conducting plate (122), and the lower edge of the outer side of the heat conducting plate (122) can be nested in the corresponding protective convex edge (4).
  7. 7. The graphite cushion block for the hot-press sintering furnace, as set forth in claim 2, characterized in that the contact surface of the flat cushion block (11) and the hollow heat conducting block (12) is provided with a positioning structure (5) which is matched with each other, the positioning structure (5) is a positioning pin (51) and a positioning hole (52), the positioning pin (51) is detachably arranged on the flat cushion block (11), the hollow heat conducting block (12) is provided with the positioning hole (52) corresponding to the positioning pin (51), and the hollow heat conducting block (12) is arranged on the flat cushion block (11) through the matching of the positioning pin (51) and the positioning hole (52).

Description

Graphite cushion block for hot-press sintering furnace Technical Field The utility model relates to the field of hot-pressed sintering, in particular to a graphite cushion block for a hot-pressed sintering furnace. Background The hot-press sintering technology is an important technology for realizing the molding of powder metallurgy materials by the assistance of a die, and is widely applied to the fields of cutters, hard alloy and the like. In the hot-pressing sintering process, graphite cushion blocks (or heat conducting blocks) at the upper end and the lower end of the die bear the key effects of heat conduction and uniform distribution of a temperature field, and the traditional solid cushion block is of a square or rectangular solid structure, so that when induced current is conducted to the die through the cushion block, the current density is centrally distributed on the surface of the cushion block. Because the central area has long heat dissipation path and fast heat accumulation, and the edge area has large contact area with the external environment and high heat dissipation rate, the temperature in the middle of the die is obviously higher than that in the periphery, and the temperature gradient can cause uneven grain growth in the product, so that the consistency of the density, hardness and mechanical strength of the material is directly affected. The prior art CN202323614806.3 discloses a polycrystalline diamond sintering die, which comprises a synthesis cavity, an insulating heat conduction layer and a heating layer, wherein the insulating heat conduction layer is enclosed into the synthesis cavity, the heating layer is positioned outside the insulating heat conduction layer, the two axial ends of the insulating heat conduction layer are respectively provided with a thinning part, and the heating layer comprises an embedded part corresponding to the thinning part. The scheme can lead the temperature field distribution in the synthesis cavity to be more uniform through the insulating heat conducting layer, but still has the following problems: 1. In addition, the scheme has limited adjustment on the whole heat dissipation path of the die, temperature difference accumulation caused by too fast heat dissipation in the edge area still exists, and the insulating layer possibly introduces interface thermal resistance to reduce the heat conduction efficiency. 2. According to the scheme, a composite structure of the insulating heat conducting layer and the heating layer is adopted, temperature field optimization is needed to be achieved through precise matching of the thinning part and the embedded part, however, the processing and assembling process of the multilayer structure is complex, the coaxiality and thickness uniformity of the die are extremely high, in actual production, small dimensional deviation or interlayer gaps can cause local stress concentration or abrupt change of heat conduction paths, temperature non-uniformity is aggravated, and meanwhile, the manufacturing cost and rejection rate of the die are increased. Disclosure of utility model In view of the above, the present utility model aims to provide a graphite cushion block for a hot press sintering furnace, which is characterized in that a hollow heat conducting block is additionally arranged between a flat cushion block and an electrode block to guide induced current to flow from the periphery preferentially, increase the heating effect and the temperature effect of the periphery of a die, reduce the conduction of core induced current, and balance the temperature difference caused by heat loss generated by contact with the outside. The technical scheme adopted for solving the technical problems is as follows: The graphite cushion block for the hot-press sintering furnace comprises a graphite cushion block which is respectively and correspondingly arranged at the upper end and the lower end of a sintering die and between the sintering die and an electrode block, The graphite cushion block comprises a flat cushion block and hollow heat conducting blocks, the flat cushion block is symmetrically arranged at the upper end and the lower end of the sintering mold, the hollow heat conducting blocks are clamped between the corresponding flat cushion blocks and electrode blocks, a hollow area is arranged in the middle of each hollow heat conducting block along the vertical axial direction, and the temperature difference between the core part and the periphery of the sintering mold is balanced by guiding induced current to flow along the periphery of the flat cushion block preferentially through adjusting the thickness of each hollow heat conducting block and the width of each hollow area. It is to be noted that the hollow area may be ring-shaped, polygonal or special-shaped, and when the hot-press sintering furnace works, the electrode block is electrified to generate induced current, and because the hollow area is arranged in the middle o