Powder metallurgy anti-deformation sintering device

Abstract

The utility model discloses a kind of powder metallurgy anti-deformation sintering devices, belong to powder metallurgy technical field, comprising: pedestal, four support columns, adjustable support unit and center support column;Adjustable support unit includes the support ring of being liftablely connected with support column by locking member, and multiple radial support mechanisms are set along the circumference of support ring;Radial support mechanism end is equipped with profiled support head, its below is equipped with elastic part, realizes the self-adapting support of rigid and soft combination;Center support column upper end is equipped with the height-adjustable fireproof top plug, for internal support.The utility model constructs a three-dimensional, elastic, adjustable multi-point support system by center top plug and periphery with elastic profiled support head, can effectively resist gravity and shrinkage stress in sintering process, significantly inhibit the warping, collapse and other deformation of complex shape powder metallurgy parts, improve product size precision and pass rate.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, specifically to a powder metallurgy anti-deformation sintering device. Background Technology

[0002] Powder metallurgy is a near-net-shape forming technology, with sintering as its core process. During sintering, metal powder compacts undergo atomic diffusion and mass migration at high temperatures, resulting in densification and strengthening. However, due to the low strength of powder compacts in the early stages of sintering and a sharp decrease in yield strength at high temperatures, they are prone to plastic deformations such as warping, sinking, and twisting under the combined effects of their own weight, internal stress release, and uneven shrinkage. This deformation problem is particularly prominent for parts with large aspect ratios, complex structures, or thin-walled features.

[0003] In existing technologies, flat refractory pads are commonly used to support pressed blanks. This method is effective for parts with simple shapes, but for complex parts, the support is passive and insufficient, failing to provide effective support for critical components such as side walls and flanges, and making it difficult to resist non-uniform shrinkage stress. Furthermore, simple rigid supports may exert restraint stress on the parts during thermal expansion and contraction, leading to cracking or deformation. Therefore, developing an anti-deformation device that can provide active, adaptive, and multi-directional support is of great significance for improving the dimensional accuracy and yield of powder metallurgy products. Utility Model Content

[0004] The purpose of this invention is to provide a powder metallurgy anti-deformation sintering device to solve the above problems. It can provide precise and elastic adaptive support from multiple directions inside and outside the product, effectively resisting the effects of gravity and shrinkage stress during the sintering process, thereby significantly suppressing deformation.

[0005] Technical Solution: This utility model provides a powder metallurgy anti-deformation sintering device, comprising: a base, supporting columns, an adjustable support unit, and a central support column; the base is a rectangular plate structure made of refractory material, serving as the installation foundation for the entire device; there are four supporting columns, vertically fixed at the four corners of the base; the adjustable support unit includes a support ring and a radial support mechanism; the support ring is horizontally arranged and is vertically connected to the four supporting columns via locking components; there are multiple radial support mechanisms arranged along the circumference of the support ring; the radial support mechanism is radially extendable and retractable, with a contoured support head at its end and an elastic portion below the contoured support head; the central support column is vertically arranged at the center of the base, and a refractory top plug is provided at the upper end of the central support column.

[0006] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the support column is provided with graduations for precisely positioning the installation height of the support ring.

[0007] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the support ring has several mounting holes in its circumferential direction, and the radial support mechanism is installed in the mounting holes.

[0008] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the radial support mechanism is a threaded rod, which is screwed into the mounting hole and can pass through the support ring, with its front end connected to the contour support head; by rotating the threaded rod, its extension length can be adjusted, thereby causing the contour support head to press or loosen the product.

[0009] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the conformal support head is made of one of alumina, graphite, or silicon carbide.

[0010] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, there are multiple adjustable support units, which are arranged in layers along the height direction of the support column to support product parts at different heights.

[0011] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the elastic part is made of a high-temperature resistant special ceramic material, such as ceramic fiber braid or a specific porous ceramic structure, which can provide elastic buffering at high temperatures.

[0012] Furthermore, in the aforementioned powder metallurgy anti-deformation sintering device, the central support column has an axially threaded through hole, and an externally threaded rod is connected below the refractory top plug, the externally threaded rod being threadedly engaged with the through hole; the height of the refractory top plug relative to the base can be adjusted by rotating it.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: The powder metallurgy anti-deformation sintering device of this utility model supports the product from the inside through the refractory top plug of the central support column, and clamps the product from the outside through the circumferentially adjustable radial support mechanism, forming a three-dimensional support system that combines internal and external components, which can actively resist the deformation tendency of the product in all directions; an elastic part is set below the contour support head, so that the support system has a certain degree of "flexibility" during the sintering process. When the product undergoes slight dimensional changes due to heating or shrinkage, the elastic part can buffer and compensate through its own elastic deformation, avoiding the stress concentration problem caused by pure rigid support, realizing adaptive support, and achieving better anti-deformation effect; the height of the support ring is adjustable, the extension length of the radial support mechanism is adjustable, and the height of the central top plug is also adjustable, so that the device can be quickly configured to adapt to products of different sizes and shapes, with extremely high versatility, especially suitable for small-batch, multi-variety production modes. All parts that come into contact with or are close to the product are made of high-temperature resistant materials, ensuring the reliability and stability of the device for long-term use in the high-temperature sintering environment and avoiding adhesion to the product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a powder metallurgy anti-deformation sintering device according to the present invention.

[0015] In the figure: 1-base; 2-support column; 201-scale; 3-adjustable support unit; 31-support ring; 311-mounting hole; 32-radial support mechanism; 321-contour support head; 322-elastic part; 33-locking part; 4-central support column; 41-fire-resistant top plug. Detailed Implementation Example

[0016] like Figure 1 The powder metallurgy anti-deformation sintering device shown includes a base 1, supporting columns 2, adjustable support units 3, and a central support column 4. The base 1 is made of a high-alumina refractory plate. Four supporting columns 2 with markings 201 are vertically fixed to the four corners of the base 1 by threaded connection or plug-in connection. Two adjustable support units 3 are installed on the supporting columns 2 in layers. Each adjustable support unit 3 includes a horizontally arranged support ring 31, which is sleeved on the four supporting columns 2 and fixed at the required height by a set screw locking member 33. Multiple threaded holes are evenly opened along the circumference of the ring body of the support ring 31 as mounting holes 311; multiple radial support mechanisms 32 are screwed into the mounting holes 311.

[0017] In this embodiment, the radial support mechanism 32 is a threaded rod, and an alumina-material contoured support head 321 is connected to the inner end of the threaded rod. Between the contoured support head 321 and the ring body of the support ring 31, an elastic part 322 made of ceramic fiber braided material is fitted. By rotating the threaded rod, the radial position of the contoured support head 321 can be precisely controlled, so that it can gently and firmly press the side wall of the product to be sintered. The presence of the elastic part 322 allows the support system to maintain a certain elasticity at high temperature, absorb the slight deformation of the product, and prevent hard jamming.

[0018] In this embodiment, a central support column 4 is vertically fixed at the center of the base 1. The central support column 4 has a through hole with internal threads. A graphite refractory plug 41 is connected to an externally threaded rod at its lower part. By rotating the refractory plug 41, the externally threaded rod is screwed into or out of the internally threaded hole of the central support column 4, thereby precisely adjusting the height of the top surface of the refractory plug 41 so that it can perfectly support the bottom of the inner cavity of the product.

[0019] In this embodiment, during use, firstly, the heights of the upper and lower support rings 31 are adjusted according to the dimensions of the product to be sintered (such as a thin-walled sleeve), so that they correspond to the easily deformable upper and lower edges of the product, respectively. Then, the refractory top plug 41 on the central support column 4 is rotated, raising its top to a suitable height to support the inner bottom of the product. Next, the product is placed on the refractory top plug 41. Finally, all the threaded rods on each layer of support rings 31 are rotated in sequence, so that the contoured support head 321, with the cooperation of the elastic part 322, evenly presses the inner and outer surfaces of the product. The entire device, along with the product, is fed into the sintering furnace, thus obtaining stable, elastic, and self-adaptive three-dimensional support throughout the process, effectively preventing various types of deformation.

[0020] It should be noted that the above description is merely a technical solution of the utility model and not a limitation. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the utility model without departing from the scope of the present utility model, and all such modifications and substitutions should be covered within the scope of the claims of the present utility model.

Claims

1. A powder metallurgy anti-deformation sintering apparatus characterized by comprising: include: Base (1), wherein the base (1) is a rectangular plate structure; Four supporting columns (2) are vertically fixed to the four corners of the base (1); An adjustable support unit (3) includes a support ring (31) and a radial support mechanism (32). The support ring (31) is horizontally arranged and connected to four support columns (2) by a locking member (33). The radial support mechanism (32) is arranged circumferentially along the support ring (31). The radial support mechanism (32) is telescopic and has a contoured support head (321) at its end. An elastic part (322) is provided below the contoured support head (321). A central support column (4) is provided at the center of the base (1), and a fire-resistant top plug (41) is provided at the upper end of the central support column (4).

2. A powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The support column (2) is equipped with a scale, which can precisely adjust the height of the support ring (31) as needed.

3. A powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The support ring (31) is provided with a plurality of mounting holes (311) in the circumferential direction for mounting a radial support mechanism (32).

4. The powder metallurgy anti-deformation sintering device according to claim 3, characterized in that: The radial support mechanism (32) is a threaded rod that is screwed into the mounting hole (311) and passes through the support ring (31). The front end is connected to the contour support head (321). The length of the threaded rod can be adjusted by rotating and extending it, so that the contour support head (321) clamps the product.

5. The powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The conformal support head (321) is made of alumina, graphite or silicon carbide.

6. The powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The adjustable support unit (3) can be arranged in multiple layers along the height direction of the support column (2).

7. A powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The elastic part (322) is made of special ceramic material.

8. A powder metallurgy anti-deformation sintering device according to claim 1, characterized in that: The central support column (4) has a through hole with a thread inside. The fire-resistant top plug (41) is connected to a threaded rod below. The threaded rod is screwed into the central support column (4), and the height of the fire-resistant top plug (41) can be adjusted according to the product.

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