Water cooling structure of powder metallurgy forming die

Abstract

A water cooling structure of powder metallurgy forming die, it includes: middle die core, middle die inner die sleeve, middle die outer die sleeve and circulating water cooling system, the middle die core is connected with the inside of middle die inner die sleeve, the middle die outer die sleeve is connected with the outside of middle die inner die sleeve, and the circulating water cooling system is connected with the inside of middle die inner die sleeve and middle die outer die sleeve.Circulating water cooling system includes: PVC pipe, cooling water inlet, cooling water outlet and spiral groove.Compared with the prior art, the cooling system structure is simple and reasonable, and the mold forming is convenient, and the condensed water in the PVC pipe can be used to cool the mold quickly, so that the formed compact is cooled and the mold is protected.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, specifically to a water-cooling structure for a powder metallurgy forming mold. Background Technology

[0002] Compression forming is one of the most fundamental processes in powder metallurgy production. Its purpose is to press loose metal powder into a semi-dense compact with specific geometry and dimensions within a mold. Powder metallurgy features near-net-shape forming, making it particularly suitable for manufacturing parts with complex radial profiles, such as carbide cutting tools and gears. Furthermore, powder metallurgy parts exhibit excellent comprehensive performance; their unique mechanical properties and high dimensional accuracy are unmatched by traditional castings. The powder metallurgy forming process mainly includes three stages: powder filling, pressing, and demolding. Due to the friction between the mold and the part during the forming process, significant heat is generated during pressing and demolding. The larger the side surface area of ​​the part, the more heat is generated, often resulting in temperatures of 70-90 degrees Celsius for both the compact and the mold. Currently, in practical use, powder metallurgy forming molds often cannot be cooled in a timely manner. The mold's thermal expansion and contraction can lead to difficulties in demolding the compact, and even severely affect the surface quality of the compact, such as surface roughening and powder adhesion. Over time, this can also damage the mold and shorten its service life.

[0003] To address the aforementioned issues, we have made a series of improvements. Utility Model Content

[0004] The purpose of this invention is to provide a water-cooled structure for powder metallurgy forming molds to overcome the above-mentioned shortcomings and deficiencies of the prior art.

[0005] A water-cooled structure for a powder metallurgy forming mold includes: a middle mold core, a middle mold inner sleeve, a middle mold outer sleeve, and a circulating water cooling system. The middle mold core is connected to the inner side of the middle mold inner sleeve, the middle mold outer sleeve is connected to the outer side of the middle mold inner sleeve, and the circulating water cooling system is connected to the inside of the middle mold inner sleeve and the middle mold outer sleeve.

[0006] The circulating water cooling system includes a PVC pipe, a cooling water inlet, a cooling water outlet, and a spiral groove. The PVC pipe is connected to the inside of the outer mold sleeve of the middle mold. The cooling water inlet and the cooling water outlet are connected to both ends of the PVC pipe. The spiral groove is located on the inner mold sleeve of the middle mold and is connected to the PVC pipe.

[0007] The beneficial effects of this utility model are:

[0008] Compared with traditional technology, this utility model adds a circulating water cooling system. The cooling system structure is simple and reasonable, which facilitates mold making and can use the condensate circulating in the PVC pipe to quickly cool the mold, thereby achieving the purpose of cooling the molded blank and protecting the mold. Attached image description:

[0009] Figure 1 This is a cross-sectional view of the present invention.

[0010] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0011] Figure 3 This is a schematic diagram of the external structure of this utility model.

[0012] Figure label:

[0013] The components include: a middle mold core 100, a middle mold inner sleeve 200, a middle mold outer sleeve 300, a circulating water cooling system 400, a PVC pipe 410, a cooling water inlet 420, a cooling water outlet 430, and a spiral groove 440. Detailed Implementation

[0014] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0015] Example 1

[0016] Figure 1 This is a cross-sectional view of the present invention. Figure 2 This is a schematic diagram of the internal structure of this utility model. Figure 3 This is a schematic diagram of the external structure of this utility model.

[0017] like Figure 1-3 As shown, a water-cooled structure for a powder metallurgy forming mold includes: a middle mold core 100, a middle mold inner sleeve 200, a middle mold outer sleeve 300, and a circulating water cooling system 400. The middle mold core 100 is connected to the inner side of the middle mold inner sleeve 200, the middle mold outer sleeve 300 is connected to the outer side of the middle mold inner sleeve 200, and the circulating water cooling system 400 is connected to the inside of the middle mold inner sleeve 200 and the middle mold outer sleeve 300.

[0018] The circulating water cooling system 400 includes a PVC pipe 410, a cooling water inlet 420, a cooling water outlet 430, and a spiral groove 440. The PVC pipe 410 is connected to the inside of the outer mold sleeve 300 of the middle mold. The cooling water inlet 420 and the cooling water outlet 430 are connected to both ends of the PVC pipe 410. The spiral groove 440 is provided on the inner mold sleeve 200 of the middle mold and is connected to the PVC pipe 410.

[0019] The principle of this invention is as follows: A chiller is connected to the forming mold via a PVC pipe 410. Cooling water enters the outer mold sleeve 300 of the forming mold from the chiller through the cooling water inlet 420, passes through the inner mold sleeve 200 and the spiral groove 440 to cool the mold core 100 and the product. Finally, the water returns to the chiller from the cooling water outlet 430, completing one cooling cycle. This invention, by adding a circulating water cooling system, has a simple and reasonable cooling system structure, which facilitates mold making and can utilize the condensate circulating in the PVC pipe to quickly cool the mold, achieving the purpose of cooling the formed blank and protecting the mold.

[0020] This invention achieves targeted cooling of different areas of the mold by setting spiral grooves 440 on the inner mold sleeve 200. This design takes into account the uneven heat distribution during powder metallurgy forming, resulting in stronger cooling of high-temperature areas and avoiding insufficient or overcooling phenomena in traditional uniform cooling methods. The special design of the spiral grooves 440 not only improves cooling efficiency but also reduces thermal stress generated in the mold during cooling by creating a temperature gradient buffer zone. This thermal stress relief mechanism significantly extends the service life of the mold and reduces the risk of mold deformation and cracking caused by thermal expansion and contraction. The connection design between the PVC pipe 410 and the spiral grooves 440 takes into account the principle of minimizing fluid resistance, ensuring that the cooling water maintains a stable flow rate and pressure within the system, avoiding problems such as uneven local flow rates and water accumulation in dead zones common in traditional water cooling systems, thereby ensuring uniform and effective cooling of the entire mold. The three-layer structure design of the middle mold core 100, the middle mold inner sleeve 200, and the middle mold outer sleeve 300 not only facilitates assembly and maintenance, but also creates multiple heat exchange interfaces, enabling heat to be conducted to the cooling system through multiple paths, thus improving the overall heat dissipation efficiency.

[0021] The specific embodiments of this utility model have been described above, but this utility model is not limited thereto. Various changes can be made to this utility model as long as they do not depart from its spirit.

Claims

1. A water-cooled structure for a powder metallurgy forming mold, characterized in that, include: The system comprises a central mold core (100), a central mold inner sleeve (200), a central mold outer sleeve (300), and a circulating water cooling system (400). The central mold core (100) is connected to the inner side of the central mold inner sleeve (200), the central mold outer sleeve (300) is connected to the outer side of the central mold inner sleeve (200), and the circulating water cooling system (400) is connected to the interior of the central mold inner sleeve (200) and the central mold outer sleeve (300). The circulating water cooling system (400) includes a PVC pipe (410), a cooling water inlet (420), a cooling water outlet (430), and a spiral groove (440). The PVC pipe (410) is connected to the inside of the outer mold sleeve (300) of the middle mold. The cooling water inlet (420) and the cooling water outlet (430) are connected to both ends of the PVC pipe (410). The spiral groove (440) is provided on the inner mold sleeve (200) of the middle mold and is connected to the PVC pipe (410).

Images