A powder metallurgy side pressing die and processing method

Abstract

The present invention discloses a powder metallurgy side pressing die and a processing method. Through the cooperative setting of an upper die, a middle die, a lower die and a middle die segment driving assembly, the middle die includes at least two middle die segments, and the middle die segment driving assembly controls at least two middle die segments to form a cavity after clamping. 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 into the cavity, the upper die and the lower die are respectively inserted into the cavity, and a preset pressure is applied through the upper die and the lower die for a preset holding time to pre-press the metal powder into shape. The upper die and the lower die are respectively removed from the cavity of the middle die, and after the middle die segments are split, the processed and formed product is obtained. The whole processing process is simple and fast, and the processing efficiency of products with irregular outer shapes is improved.

Description

Technical Field

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

[0002] Powder metallurgy is a process technology for producing metal powders or using metal powders (or mixtures of metal powders and non-metal powders) as raw materials, and manufacturing metal materials, composite materials, and various types of products through forming and sintering. Porous, semi-dense or fully dense materials (including products) are obtained by powder metallurgy processes. Powder metallurgy materials have unique chemical compositions and physical and mechanical properties that cannot be obtained by traditional melting and casting processes. For example, the porosity of the material can be controlled, the material structure is uniform, and there is no macroscopic segregation (the phenomenon that the chemical composition is not uniform in different parts of the cross-section after alloy solidification due to the macroscopic flow of the liquid alloy). It can be formed in one step, etc.

[0003] Currently, powder metallurgy is usually used to produce products with regular shapes, such as products with circular or square shapes. If products with irregular shapes need to be produced, usually the products can only be formed into circular or square shapes first and then processed or finely carved with other machines, which has many procedures and reduces the production and processing efficiency. Summary of the Invention

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

[0005] A powder metallurgy side pressing die includes an upper die, a middle die, a lower die, and a middle die segment driving assembly. The middle die includes at least two middle die segments. One end of the middle die segment is installed on the middle die segment driving assembly, and a receiving groove is formed at one end far from the middle die segment driving assembly. The middle die segment driving assembly is used to drive the corresponding middle die segment to close the die. After the at least two middle die segments are closed, the receiving grooves on the middle die segments are spliced to form a cavity. Openings are formed at the top and bottom of the cavity in the vertical direction, so that the inside of the cavity is communicated with the external space;

[0006] The upper die and the lower die are respectively inserted into or removed from the cavity through the openings, and metal powder is placed in the cavity;

[0007] A processing method of a powder metallurgy side pressing die is applied to the powder metallurgy side pressing die. The processing method includes:

[0008] Closing a preset number of middle die segments to form a cavity in the middle die;

[0009] Inserting the lower die at the bottom opening of the cavity of the middle die;

[0010] Add a preset volume of metal powder through the top opening of the middle mold cavity;

[0011] Insert the upper mold into the middle mold cavity through the top opening of the middle mold cavity until it abuts against the metal powder;

[0012] Apply a preset pressure to the upper mold and the lower mold for a preset holding time to preform the metal powder;

[0013] Remove the upper mold and the lower mold from the middle mold cavity respectively. After splitting the middle mold petals, the processed and formed product is obtained.

[0014] In one embodiment, the powder metallurgy side pressing die further includes a cavity pressing plate assembly. The cavity pressing plate assembly is installed at one end of the middle mold petal close to the accommodating groove for extruding the metal powder in the cavity.

[0015] In one embodiment, the number of the cavity pressing plate assemblies is adapted to the number of the middle mold petals.

[0016] In one embodiment, the middle mold petal is provided with a pressing plate assembly accommodating groove for installing the cavity pressing plate assembly. The pressing plate assembly accommodating groove is communicated with the cavity.

[0017] In one embodiment, the cavity pressing plate assembly includes a driving member and a pressing plate. The pressing plate is installed on the driving member. The driving member is used to control the pressing or separation of the pressing plate from the metal powder in the cavity.

[0018] In one embodiment, a notch is formed at one end of the pressing plate close to the cavity. The shape of the notch is adapted to the shape of the accommodating groove of the corresponding middle mold petal of the notch.

[0019] In one embodiment, the middle mold petal driving assembly includes a driver and a connecting plate. The connecting plate is fixedly or detachably installed on the driver. The middle mold petal is fixedly or detachably installed on the connecting plate. The driver drives the middle mold petal to perform mold closing or mold opening through the connecting plate.

[0020] In one embodiment, the cavity of the middle mold is made of an alloy material, and the shape and size of the cavity are adapted to the external shape and size of the product to be processed.

[0021] In one embodiment, after applying a preset pressure to the upper mold and the lower mold for a preset holding time to preform the metal powder, the cavity pressing plate assembly can be used to perform secondary pressure forming on the preformed product.

[0022] In one embodiment, 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.

[0023] The above powder metallurgy side pressing die is provided with a cooperation of an upper die, a middle die, a lower die and a middle die segment driving component. The middle die includes at least two middle die segments. The middle die segment driving component controls at least two middle die segments to form a cavity after clamping. 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 into the cavity. The upper die and the lower die are respectively inserted into the cavity. A preset pressure is applied through the upper die and the lower die for a preset holding time to pre-press the metal powder into shape. The upper die and the lower die are respectively removed from the middle mold cavity. After the middle die segments are split, the processed and formed product is obtained. The whole processing process is simple and fast, improving the processing efficiency of products with irregular outer shapes. By setting the middle die as a plurality of middle die segments that can be spliced together, it is convenient to demold after processing products with irregular outer shapes. If the middle die is an integral structure, it is impossible to complete the demolding work after processing products with irregular outer shapes. Description of the Drawings

[0024] Figure 1 Exploded structural schematic diagram of the powder metallurgy side pressing die according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 Assembly structural schematic diagram of the powder metallurgy side pressing die according to an embodiment of the present invention;

[0026] Figure 3 is Figure 1 Cross-sectional structural schematic diagram of the powder metallurgy side pressing die according to an embodiment of the present invention;

[0027] Figure 4 is Figure 1 Structural schematic diagram of the middle die segment driving component of the powder metallurgy side pressing die according to an embodiment of the present invention;

[0028] Figure 5 Flow schematic diagram of the processing method of the powder metallurgy side pressing die according to an embodiment of the present invention. Detailed Description of the Embodiment

[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present at the same time. On the contrary, when an element is referred to as being "directly" connected to another element, there is no intermediate element.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein 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 of the related listed items.

[0032] As Figure 1 、 Figure 2 and Figure 3 shown, a powder metallurgy side pressing die includes an upper die 1, a middle die 2, a lower die 3 and a middle die segment driving assembly 4. The middle die 2 includes at least two middle die segments 21. One end of the middle die segment 21 is mounted on the middle die segment driving assembly 4, and a receiving groove 211 is formed at the end away from the middle die segment driving assembly 4. The middle die segment driving assembly 4 is used to drive the corresponding middle die segment 21 to close the die. After the at least two middle die segments 21 are closed, the receiving grooves 211 on the middle die segments 21 are spliced to form a cavity 5. An opening 51 is formed at the top and bottom of the cavity 5 in the vertical direction, so that the inside of the cavity 5 is communicated with the external space;

[0033] The upper die 1 and the lower die 2 are respectively inserted into or removed from the cavity 5 through the opening 51, and metal powder is placed in the cavity 5.

[0034] The number of middle die segments 21 is at least two and can also be multiple, which is set according to the actual needs of the product. The cavity 5 of the middle die 2 is made of an alloy material, and the shape and size of the cavity 5 are adapted to the shape and size of the product to be processed. The shape and size of the receiving groove 211 of the middle die segment 21 are designed according to the actual shape and size of the product to be processed.

[0035] When processing the product is required, the middle die segment driving assembly 4 drives a preset number of middle die segments 21 to close the die. After the middle die segments 21 are closed, a cavity 5 is formed in the middle die 2. The lower die 3 is inserted into the cavity 5 of the middle die 2 through the opening 51 at the bottom of the cavity 5. A preset volume of metal powder to be processed is injected through the opening 51 at the top of the cavity 5. After the metal powder injection is completed, the upper die 1 is inserted into the cavity 5 through the opening 51 at the top of the cavity 5. A preset pressure is applied to the upper die 1 and the lower die 3 by a press for a preset holding time to preform the metal powder. The upper die 1 and the lower die 3 are respectively removed from the opening 51 at the top and the opening 51 at the bottom of the cavity 5. The middle die segment driving assembly 4 drives the middle die segments 21 to open the die, and the preformed product is taken out.

[0036] In this way, in the powder metallurgy side pressing die, through the cooperative setting of the upper die 1, the middle die 2, the lower die 3 and the middle die segment driving assembly 4, the middle die 2 includes at least two middle die segments 21. The middle die segment driving assembly 4 controls at least two middle die segments 21 to close the die to form a cavity 5. 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 die 1 and the lower die 3 are respectively inserted into the cavity 5. A preset pressure is applied to the upper die 1 and the lower die 3 for a preset holding time to preform the metal powder. The upper die 1 and the lower die 3 are respectively removed from the middle die cavity 5. After the middle die segments 21 are opened, the processed and formed product is obtained. The whole processing process is simple and fast, improving the processing efficiency of products with irregular outer shapes. By setting the middle die 2 as a plurality of middle die segments 21 that can be spliced together, it is convenient to demold after processing products with irregular outer shapes. If the middle die 2 is an integral structure, the product with an irregular outer shape cannot be demolded after processing.

[0037] In one embodiment, the powder metallurgy side pressing die further includes a cavity pressing plate assembly 6. The cavity pressing plate assembly 6 is installed at one end of the middle die segment 21 close to the accommodation groove 211 for extruding the metal powder in the cavity 5. The number of the cavity pressing plate assemblies 6 is adapted to the number of the middle die segments 21.

[0038] The middle die segment 21 is provided with a pressing plate assembly accommodation groove 212 for installing the cavity pressing plate assembly 6. The pressing plate assembly accommodation groove 212 is communicated with the cavity 5.

[0039] The cavity pressing plate assembly 6 includes a driving member and a pressing plate 61. The pressing plate 61 is installed 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.

[0040] One end of the pressing plate 61 close to the cavity 5 is provided with a notch 611, and the shape of the notch 611 is adapted to the shape of the accommodation groove 211 of the middle die segment corresponding to the notch 611.

[0041] The pressing plate 61 is installed in the accommodation groove 212 of the pressing plate assembly and can move within the accommodation groove 212 of the pressing plate assembly. The driving member can be installed on the driving assembly 4 of the middle die segment. The pressing plate 61 is driven to slide within the accommodation groove 212 of the pressing plate assembly by the driving member. The driving member can be a cylinder, and the driving member can be controlled by a 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 accommodation groove 211 and will not protrude or sink relative to the surface of the accommodation groove 211.

[0042] After the product is pre-pressed in the cavity 5, the driving member drives the pressing plate 61 to perform secondary pressing 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.

[0043] As Figure 4 shown, in one embodiment, the driving assembly 4 of the middle die segment includes a driver 41 and a connecting plate 42. The connecting plate 42 is fixedly or detachably installed on the driver 41, and the middle die segment 21 is fixedly or detachably installed on the connecting plate 42. The driver 41 drives the middle die segment 21 to perform mold closing or mold opening through the connecting plate 42.

[0044] In this way, the driver 41 can be a linear motor or a rack and pinion structure, which is used to drive the connecting plate 42 to move, and then drive the middle die segment 21 to perform mold closing or mold opening through the connecting plate 42.

[0045] As Figure 5 shown, a processing method for a powder metallurgy side pressing die is applied to a powder metallurgy side pressing die. The processing method includes:

[0046] S1. After closing a preset number of middle die segments 21, a cavity 5 is formed in the middle die 2; the shape and size of the cavity 5 are adapted to the shape and size of the product to be processed;

[0047] S2. Insert the lower die 3 into the bottom opening 51 of the middle die cavity 5; this can prevent metal powder from leaking out of the cavity 5;

[0048] S3. Add a preset volume of metal powder through the top opening 51 of the middle die cavity 5; inject a preset volume of metal powder through the top opening 51 of the middle die cavity 5 by an extrusion molding machine;

[0049] S4. Insert the upper die 1 into the middle die cavity 5 through the top opening 51 of the middle die cavity 5 until it abuts against the metal powder.

[0050] S5. Apply a preset pressure to the upper die 1 and the lower die 3 for a preset holding time to preform the metal powder; use a pressure forming machine to simultaneously apply a pressure of a preset pressure value to the upper die 1 and the lower die 3 according to a preset program. 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 larger, a relatively longer holding time is required.

[0051] S6. Remove the upper die 1 and the lower die 3 from the middle die cavity 5 respectively. After splitting the middle die petals 21, the processed and formed product is obtained. The middle die petal driving assembly 4 controls the middle die petals 21 to split the mold, and takes out the processed and formed product from the cavity 5.

[0052] In one embodiment, after applying a preset pressure to the upper die 1 and the lower die 3 for a preset holding time to preform the metal powder, the preformed product can be secondarily pressurized and formed by the cavity pressing plate assembly.

[0053] In this way, the product in the cavity 5 is secondarily pressurized by the pressing plate 61 on the cavity pressing plate assembly to compact the product, effectively avoiding cracks in the product.

[0054] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A powder metallurgy side pressing die, characterized in that: It includes an upper mold, a middle mold, a lower mold and a middle mold segment driving assembly. The middle mold includes at least two middle mold segments. One end of each middle mold segment is mounted on the middle mold segment driving assembly, and a receiving groove is formed at the end far from the middle mold segment driving assembly. The middle mold segment driving assembly is used to drive the corresponding middle mold segment to close the mold. After the at least two middle mold segments are closed, the receiving grooves on the middle mold segments are spliced to form a cavity, and openings are respectively formed at the top and bottom of the cavity in the vertical direction, so that the inside of the cavity is communicated with the external space; The upper mold and the lower mold are respectively inserted into or removed from the cavity through the openings, and metal powder is placed in the cavity; A processing method of a powder metallurgy side pressing mold includes: Closing a preset number of middle mold segments to form a cavity in the middle mold; Inserting the lower mold at 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 mold and the lower mold for a preset holding time to preform the metal powder; Removing the upper mold and the lower mold from the middle mold cavity respectively, and separating the middle mold segments to obtain the processed and formed product; The powder metallurgy side pressing mold further includes a cavity pressing plate assembly. The cavity pressing plate assembly is installed at one end of the middle mold segment close to the receiving groove for extruding the metal powder in the cavity. The cavity pressing plate assembly includes a driving member and a pressing plate. The pressing plate is mounted on the driving member, and the driving member is used to control the pressing plate to be extruded against or separated from the metal powder in the cavity; The pressing plate is installed in the receiving groove of the pressing plate assembly, and the driving member is installed on the middle mold segment driving assembly. The driving member drives the pressing plate to slide in the receiving groove of the pressing plate assembly. The driving member is a cylinder, and the driving member is controlled by a control module; In the initial state of the pressing plate, the notch of the pressing plate is on the same plane as the surface of the receiving groove, and there is no protrusion or depression relative to the surface of the receiving groove; After the product is pre-pressed in the cavity, the driving member drives the pressing plate to perform secondary pressing on the product in the cavity to compact the product.

2. The powder metallurgy side pressing die according to claim 1, wherein: The number of the cavity pressing plate assemblies is adapted to the number of the middle mold segments.

3. A powder metallurgy side pressing die according to claim 1, characterized in that: The middle mold segment is provided with a pressing plate assembly receiving groove for installing the cavity pressing plate assembly, and the pressing plate assembly receiving groove is communicated with the cavity.

4. A powder metallurgy side pressing die according to claim 1, characterized in that: One end of the pressing plate close to the cavity is provided with a notch, and the shape of the notch is adapted to the shape of the receiving groove of the corresponding middle mold segment.

5. A powder metallurgy side pressing die according to claim 1, characterized in that: The middle mold segment driving assembly includes a driver and a connecting plate. The connecting plate is fixedly or detachably mounted on the driver, and the middle mold segment is fixedly or detachably mounted on the connecting plate. The driver drives the middle mold segment to close or separate the mold through the connecting plate.

6. The powder metallurgy side pressing die according to claim 1, wherein: The cavity of the middle mold is made of an alloy material, and the shape and size of the cavity are adapted to the external shape and size of the product to be processed.

7. The processing method of the powder metallurgy side pressing die according to claim 1, characterized in that, Applying a preset pressure to the upper mold and the lower mold for a preset pressure holding time, after the metal powder is pre-pressed into shape, the pressing plate is driven by a driving member to perform secondary pressing on the product in the cavity to form it.

8. The processing method of the powder metallurgy side pressing die according to claim 1, characterized in that, Adding a preset volume of metal powder through the top opening of the middle mold cavity, 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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