Powder metallurgy side pressing die and machining method

Abstract

According to the powder metallurgy side pressing die and the machining method, an upper die, a middle die, a lower die and a middle die petal driving assembly are arranged in a matched mode, the middle die comprises at least two middle die petals, the middle die petal driving assembly controls the at least two middle die petals to be closed to form a cavity, and the shape of the cavity is matched with that of a product to be machined; to-be-processed metal powder with a preset volume is added into the cavity, the upper die and the lower die are respectively inserted into the cavity, preset pressure is applied through the upper die and the lower die to reach preset pressure maintaining time, so that the metal powder is pre-pressed and formed, the upper die and the lower die are respectively moved out of the cavity of the middle die, and a processed and formed product is obtained after the die petals of the middle die are split. The whole machining process is simple and rapid, and the machining efficiency of irregular products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy processing, in particular to a powder metallurgy side pressure die and a processing method thereof. Background Art

[0002] Powder metallurgy is a process technology that produces metal powder or uses metal powder (or a mixture of metal powder and non-metallic powder) as raw material, and then forms and sinters it to manufacture metal materials, composite materials and various types of products. Porous, semi-dense or fully dense materials (including products) made by powder metallurgy. Powder metallurgy materials have unique chemical composition and physical and mechanical properties that cannot be obtained by traditional melting and casting processes, such as controllable porosity, uniform material structure, no macro-segregation (after the alloy solidifies, there is no chemical composition unevenness in different parts of its cross section due to the macroscopic flow of liquid alloy), and can be formed in one step.

[0003] At present, powder metallurgy is usually used to make products with regular shapes, for example, products with round or square shapes. If you need to make products with irregular shapes, you usually have to first mold the products into round or square shapes and then use other machines for processing or fine carving. The process is complicated and reduces the efficiency of production and processing. Summary of the invention

[0004] Based on this, it is necessary to provide a powder metallurgy side pressure die and processing method, which can effectively improve the processing efficiency of irregular-shaped products.

[0005] A powder metallurgy side pressure mold, comprising an upper mold, a middle mold, a lower mold and a middle mold half driving assembly, wherein the middle mold comprises at least two middle mold halfs, one end of the middle mold half is mounted on the middle mold half driving assembly, and an end away from the middle mold half driving assembly is provided with a receiving groove, the middle mold half driving assembly is used to drive the corresponding middle mold half to close the mold, after the at least two middle mold halfs are closed, the receiving grooves on the middle mold halfs are spliced ​​to form a cavity, and the cavity is respectively provided with openings at the top and bottom along the vertical direction, so that the interior of the cavity is connected with the external space; The upper die and the lower die are respectively inserted into or removed from the mold cavity through the opening, and the mold cavity is used to place metal powder; A method for processing a powder metallurgy side pressure die, applied to a powder metallurgy side pressure die, the processing method comprising: After a preset number of middle mold halves are closed together, a cavity is formed in the middle mold; Inserting the lower mold into the bottom opening of the middle mold cavity; Adding a preset volume of metal powder through the top opening of the middle mold cavity; Inserting the upper mold into the middle mold cavity through the top opening of the middle mold cavity until it abuts against the metal powder; Applying a preset pressure to the upper die and the lower die for a preset holding time to pre-press the metal powder into shape; The upper mold and the lower mold are respectively moved out of the middle mold cavity, and the middle mold halves are separated to obtain a processed and formed product.

[0006] In one of the embodiments, the powder metallurgy side pressure mold further includes a cavity pressure plate assembly, which is installed in the middle mold halves at one end close to the accommodating groove and is used to extrude the metal powder in the cavity.

[0007] In one of the embodiments, the number of the cavity pressure plate assemblies matches the number of the middle mold halves.

[0008] In one of the embodiments, the middle mold halves are provided with a pressure plate assembly accommodating groove for installing the cavity pressure plate assembly, and the pressure plate assembly accommodating groove is connected to the cavity.

[0009] In one of the embodiments, the cavity pressure plate assembly includes a driving member and a pressure plate, wherein the pressure plate is mounted on the driving member, and the driving member is used to control the pressing plate to extrude or separate from the metal powder in the cavity.

[0010] In one of the embodiments, a notch is formed at one end of the pressing plate close to the mold cavity, and the shape of the notch matches the shape of the receiving groove of the middle mold half corresponding to the notch.

[0011] In one of the embodiments, the middle mold half driving assembly includes a driver and a connecting plate, the connecting plate is fixedly or detachably mounted on the driver, the middle mold half is fixedly or detachably mounted on the connecting plate, and the driver drives the middle mold half to close or separate the molds through the connecting plate.

[0012] In one of the embodiments, the cavity of the middle mold is made of alloy material, and the shape and size of the cavity are adapted to the outer size of the product to be processed.

[0013] In one of the embodiments, a preset pressure is applied to the upper mold and the lower mold for a preset holding time, so that after the metal powder is pre-pressed, the pre-pressed product can be subjected to secondary pressurization through the cavity pressure plate assembly.

[0014] In one of the embodiments, a preset volume of metal powder is added through the top opening of the middle mold cavity, and the metal powder can be injected into the middle mold cavity through the top opening of the middle mold cavity by an extrusion molding machine.

[0015] The above-mentioned powder metallurgy side pressure mold is arranged through the coordination of the upper mold, the middle mold, the lower mold and the middle mold halves driving assembly. The middle mold includes at least two middle mold halves. The middle mold halves driving assembly controls at least two middle mold halves to form a cavity after the mold is closed. The shape of the cavity is adapted to the shape of the product to be processed. A preset volume of metal powder to be processed is added to the cavity. The upper mold and the lower mold are respectively inserted into the cavity. A preset pressure is applied by the upper mold and the lower mold to achieve a preset holding time so that the metal powder is pre-pressed and formed. The upper mold and the lower mold are respectively moved out of the middle mold cavity, and the middle mold halves are separated to obtain the processed and formed product. The whole processing process is simple and fast, which improves the processing efficiency of irregular-shaped products. By setting the middle mold to multiple middle mold halves that can be spliced ​​together, it is convenient to demold the irregular-shaped products after the processing is completed. If the middle mold is an integral structure, the irregular-shaped products cannot be demolded after the processing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the explosion structure of a powder metallurgy side pressure die according to one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the assembly structure of a powder metallurgy side pressure die according to an embodiment of the present invention; Figure 3 for Figure 1 A schematic cross-sectional view of a powder metallurgy side pressure die according to an embodiment of the present invention; Figure 4 for Figure 1 A schematic structural diagram of a middle mold half driving assembly of a powder metallurgy side pressure mold according to an embodiment of the present invention; Figure 5 The figure is a schematic flow chart of a method for processing a powder metallurgy side pressure die according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0018] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is said to be "directly" connected to another element, there is no intermediate element.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, a powder metallurgy side pressure mold comprises an upper mold 1, a middle mold 2, a lower mold 3 and a middle mold half driving assembly 4, wherein the middle mold 2 comprises at least two middle mold halfs 21, one end of the middle mold half 21 is mounted on the middle mold half driving assembly 4, and an accommodating groove 211 is provided at one end away from the middle mold half driving assembly 4, and the middle mold half driving assembly 4 is used to drive the corresponding middle mold half 21 to close the mold, after the at least two middle mold halfs 21 are closed, the accommodating grooves 211 on the middle mold half 21 are spliced ​​to form a cavity 5, and the cavity is respectively formed with openings 51 at the top and bottom along the vertical direction, so that the interior of the cavity 5 is connected with the external space; The upper die 1 and the lower die 2 are respectively inserted into or removed from the mold cavity 5 through the opening 51 , and the mold cavity 5 is used for placing metal powder.

[0021] The number of the middle mold halves 21 is at least two, and may be multiple, and is set according to the actual needs of the product. The cavity 5 of the middle mold 2 is made of alloy material, and the shape and size of the cavity 5 are adapted to the size of the product to be processed. The shape and size of the accommodating groove 211 of the middle mold halves 21 is designed according to the size of the actual product to be processed.

[0022] When the product needs to be processed, the middle mold halves 21 are driven by the middle mold halves driving assembly 4 to close the mold. After the middle mold halves 21 are closed, a cavity 5 is formed in the middle mold 2. The lower mold 3 is inserted into the cavity 5 of the middle mold 2 through the opening 51 at the bottom of the cavity 5. A preset volume of metal powder to be processed is injected from the opening 51 at the top of the cavity 5. After the metal powder is injected, the upper mold 1 is inserted into the cavity 5 from the opening 51 at the top of the cavity 5. A preset pressure is applied to the upper mold 1 and the lower mold 3 by the press for a preset holding time to pre-press the metal powder. The upper mold 1 and the lower mold 3 are removed from the opening 51 at the top and the opening 51 at the bottom of the cavity 5, respectively. The middle mold halves driving assembly 4 drives the middle mold halves 21 to separate the molds to take out the preformed product.

[0023] In this way, the powder metallurgy side pressure mold is arranged through the coordination of the upper mold 1, the middle mold 2, the lower mold 3 and the middle mold halves driving assembly 4. The middle mold 2 includes at least two middle mold halves 21. The middle mold halves driving assembly 4 controls at least two middle mold halves 21 to form a cavity 5 after the mold is closed. The shape of the cavity 5 is adapted to the shape of the product to be processed. A preset volume of metal powder to be processed is added to the cavity 5. The upper mold 1 and the lower mold 3 are respectively inserted into the cavity 5. A preset pressure is applied by the upper mold 1 and the lower mold 3 to achieve a preset holding time so that the metal powder is pre-pressed and formed. The upper mold 1 and the lower mold 3 are respectively moved out of the middle mold cavity 5. After the middle mold halves 21 are separated, the processed product is obtained. The whole processing process is simple and fast, which improves the processing efficiency of irregular-shaped products. By setting the middle mold 2 to multiple middle mold halves 21 that can be spliced ​​together, it is convenient to demold the irregular-shaped products after processing. If the middle mold 2 is an integral structure, the irregular-shaped products cannot be demolded after processing.

[0024] In one embodiment, the powder metallurgy side pressure mold further includes a cavity pressure plate assembly 6, which is installed at one end of the middle mold half 21 close to the accommodating groove 211 and is used to extrude the metal powder in the cavity 5; the number of the cavity pressure plate assemblies 6 is adapted to the number of the middle mold half 21; The middle mold half 21 is provided with a pressure plate assembly accommodating groove 212 for installing the cavity pressure plate assembly 6 , and the pressure plate assembly accommodating groove 212 is connected to the cavity 5 .

[0025] The cavity pressure plate assembly 6 includes a driving member and a pressure plate 61 . The pressure plate 61 is mounted on the driving member. The driving member is used to control the pressing plate 61 to extrude or separate from the metal powder in the cavity 5 .

[0026] A notch 611 is formed at one end of the pressing plate 61 close to the mold cavity 5 , and the shape of the notch 611 matches the shape of the receiving groove 211 of the middle mold half corresponding to the notch 611 .

[0027] The pressing plate 61 is installed in the pressing plate assembly receiving groove 212 and can move in the pressing plate assembly receiving groove 212. The driving member can be installed on the middle mold half driving assembly 4, and the pressing plate 61 is driven by the driving member to slide in the pressing plate assembly receiving groove 212. The driving member can be a cylinder, and the driving member can be controlled by the control module. When the pressing plate 61 is in the initial state, the notch 611 of the pressing plate 61 is on the same plane as the surface of the receiving groove 211, and will not be protruded or recessed relative to the surface of the receiving groove 211.

[0028] After the product is pre-pressed in the cavity 5, the driving member drives the pressing plate 61 to perform secondary pressurization on the product in the cavity 5 to compact the product, effectively avoiding cracks in the product and further ensuring the quality of the product.

[0029] like Figure 4 As shown, in one embodiment, the middle mold half driving assembly 4 includes a driver 41 and a connecting plate 42, the connecting plate 42 is fixedly or detachably mounted on the driver 41, the middle mold half 21 is fixedly or detachably mounted on the connecting plate 42, and the driver 41 drives the middle mold half 21 to close or separate the mold through the connecting plate 42.

[0030] In this way, the driver 41 can be a linear motor or a gear rack structure, which is used to drive the connecting plate 42 to move, and then drive the middle mold halves 21 to close or separate the molds through the connecting plate 42.

[0031] like Figure 5 As shown, a method for processing a powder metallurgy side pressure die is applied to a powder metallurgy side pressure die, and the processing method includes: S1, after a preset number of middle mold halves 21 are molded together, a cavity 5 is formed in the middle mold 2; the shape and size of the cavity 5 are adapted to the shape and size of the product to be processed; S2, inserting the lower mold 3 into the bottom opening 51 of the middle mold cavity 5, so as to prevent the metal powder from leaking out of the cavity 5; S3, adding a preset volume of metal powder through the top opening 51 of the middle mold cavity 5; injecting the metal powder into the preset volume of metal powder through the top opening 51 of the middle mold cavity 5 by an extrusion molding machine; S4, inserting the upper mold 1 into the middle mold cavity 5 through the top opening 51 of the middle mold cavity 5 until it abuts against the metal powder; S5, applying a preset pressure to the upper mold 1 and the lower mold 3 for a preset holding time to pre-press the metal powder into shape; using a pressure forming machine, applying a preset pressure value to the upper mold 1 and the lower mold 3 at the same time according to a preset program, and the preset holding time is: 10S-30S. The holding time can be set according to the actual size of the product. For example, if the size of the product is large, the required holding time is also relatively longer.

[0032] S6, the upper mold 1 and the lower mold 3 are respectively moved out of the middle mold cavity 5, and the middle mold halves 21 are separated to obtain the processed product. The middle mold halves driving assembly 4 controls the middle mold halves 21 to separate the molds, and takes the processed product out of the cavity 5.

[0033] In one of the embodiments, a preset pressure is applied to the upper mold 1 and the lower mold 3 for a preset holding time, so that after the metal powder is pre-pressed, the pre-pressed product can be subjected to secondary pressurization through the cavity pressure plate assembly.

[0034] In this way, the product in the cavity 5 is pressurized for the second time by the pressing plate 61 on the cavity pressing plate assembly to compact the product and effectively avoid cracks in the product.

[0035] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A powder metallurgy side pressure die, characterized in that: The mold comprises an upper mold, a middle mold, a lower mold and a middle mold half driving assembly, wherein the middle mold comprises at least two middle mold halfs, one end of the middle mold half is mounted on the middle mold half driving assembly, and an end away from the middle mold half driving assembly is provided with a receiving groove, and the middle mold half driving assembly is used to drive the corresponding middle mold half to close the mold, and after the at least two middle mold halfs are closed, the receiving grooves on the middle mold halfs are spliced ​​to form a mold cavity, and the mold cavity is respectively provided with openings at the top and bottom along the vertical direction, so that the inside of the mold cavity is connected with the external space; The upper die and the lower die are respectively inserted into or removed from the mold cavity through the opening, and the mold cavity is used to place metal powder; A method for processing a powder metallurgy side pressure die, comprising: After a preset number of middle mold halves are closed together, a cavity is formed in the middle mold; Inserting the lower mold into the bottom opening of the middle mold cavity; Adding a preset volume of metal powder through the top opening of the middle mold cavity; Inserting the upper mold into the middle mold cavity through the top opening of the middle mold cavity until it abuts against the metal powder; Applying a preset pressure to the upper die and the lower die for a preset holding time to pre-press the metal powder into shape; The upper mold and the lower mold are respectively moved out of the middle mold cavity, and the middle mold halves are separated to obtain a processed and formed product.

2. A powder metallurgy side pressure die according to claim 1, characterized in that: The powder metallurgy side pressure mold also includes a cavity pressure plate assembly, which is installed in the middle mold halves at one end close to the accommodating groove and is used to extrude the metal powder in the cavity.

3. A powder metallurgy side pressure die according to claim 2, characterized in that: The number of the cavity pressure plate assemblies matches the number of the middle mold halves.

4. The powder metallurgy side pressure die according to claim 2, characterized in that: The middle mold halves are provided with a pressure plate assembly accommodating groove for installing the cavity pressure plate assembly, and the pressure plate assembly accommodating groove is connected to the cavity.

5. The powder metallurgy side pressure die according to claim 4, characterized in that: The cavity pressure plate assembly comprises a driving member and a pressure plate, wherein the pressure plate is mounted on the driving member, and the driving member is used to control the pressing plate to extrude or separate from the metal powder in the cavity.

6. The powder metallurgy side pressure die according to claim 5, characterized in that: A notch is formed at one end of the pressing plate close to the mold cavity, and the shape of the notch matches the shape of the receiving groove of the middle mold half corresponding to the notch.

7. The powder metallurgy side pressure die according to claim 1, characterized in that: The middle mold half driving assembly includes a driver and a connecting plate, wherein the connecting plate is fixedly or detachably mounted on the driver, and the middle mold half is fixedly or detachably mounted on the connecting plate, and the driver drives the middle mold half to close or separate the mold via the connecting plate.

8. The powder metallurgy side pressure die according to claim 1, characterized in that: The cavity of the middle mold is made of alloy material, and the shape and size of the cavity are adapted to the outer size of the product to be processed.

9. The method for processing a powder metallurgy side pressure die according to claim 1, characterized in that: The preset pressure is applied to the upper die and the lower die for a preset holding time, so that after the metal powder is pre-pressed, the pre-pressed product can be subjected to secondary pressurization through the cavity pressure plate assembly.

10. The method for processing a powder metallurgy side pressure die according to claim 1, characterized in that: The metal powder of a preset volume is added through the top opening of the middle mold cavity, and the metal powder can be injected into the middle mold cavity through the top opening of the middle mold cavity by an extrusion molding machine.

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