Powder metallurgy forming die for middle frame of watch and forming method of powder metallurgy forming die

Abstract

The invention relates to the technical field of watch middle frame production, and discloses a watch middle frame powder metallurgy forming die and a forming method thereof.The watch middle frame powder metallurgy forming die comprises an upper die base, a lower die base and a slide mechanism; an upper mold core is arranged in the upper mold base; the lower die holder is arranged below the upper die holder; a lower mold core is arranged in the lower mold base; a push plate is arranged in the lower die base and located below the lower die core. An ejection mechanism is arranged on the push plate; the slide mechanism comprises a first slide assembly, a second slide assembly and a third slide assembly; the first slide assembly, the second slide assembly and the third slide assembly are arranged on the lower die base in the circumferential direction. Two groups of symmetrically distributed forming plates are arranged on the upper mold core; the first slide assembly comprises a first forming block; the first forming block is slidably connected to the lower mold core and comprises an inner forming part and two sets of outer forming parts. The inner forming part is connected with the second slide assembly; the two outer forming parts are arranged on the two sides of the inner forming part. The outer forming part is slidably connected with the inner forming part.

Description

Technical Field

[0001] This invention relates to the field of watch frame manufacturing technology, specifically to powder metallurgy forming molds for watch frames and their forming methods. Background Technology

[0002] A watch, also known as a wristwatch, is an instrument worn on the wrist to tell or display time. Watches are usually made of materials such as leather, rubber, nylon, or stainless steel, and the watch head that displays the time is fastened to the wrist.

[0003] Currently, most watch frame structures are prefabricated using powder metallurgy molding dies, then degreased and sintered to obtain the finished product. The frame structure has multiple holes in different directions, which are often formed using traditional sliding or angled top structures. However, when the prefabricated blank is formed and discharged, the traditional sliding or angled top structures are simple and monolithic. For a part with multiple holes in different directions, the undercut cannot be demolded, requiring manual disassembly and discharge, which is time-consuming and labor-intensive, reducing production efficiency. Moreover, when replacing, the entire sliding block needs to be replaced, increasing costs.

[0004] Therefore, there is an urgent need for powder metallurgy forming molds and forming methods for watch frames to solve the above problems. Summary of the Invention

[0005] Based on the above, the purpose of this invention is to provide a powder metallurgy molding die and its molding method for a watch frame, so as to solve the problem that the traditional sliding or inclined top structure is simple and singular, cannot achieve undercut demolding, and requires manual disassembly and unloading.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A powder metallurgical forming mold for a watch frame includes an upper mold base, a lower mold base, and a sliding mechanism. The upper mold base contains an upper mold core. The lower mold base is located below the upper mold base. The lower mold base contains a lower mold core corresponding to the upper mold core. The lower mold base contains a push plate, which is located below the lower mold core. The push plate has an ejection mechanism for ejecting the blank. The sliding mechanism includes a first sliding component, a second sliding component, and a third sliding component. The first, second, and third sliding components are circumferentially disposed on the lower mold base and are used for forming the inner side holes of the watch frame. The upper mold core has two symmetrically distributed forming plates corresponding to the third sliding component. The first sliding component includes a first forming block. The first forming block is slidably connected to the lower mold core and includes an inner forming part and two sets of outer forming parts. The inner forming part is connected to the second sliding component. The two sets of outer forming parts are symmetrically distributed on both sides of the inner forming part. The outer forming parts and the inner forming parts are slidably connected.

[0008] As a preferred embodiment of the powder metallurgy forming mold for the watch frame, the first positioning component further includes a first slider and a first limiting block; the first slider is disposed in the lower mold base and is connected to the outer forming part; the first sliding block is slidably connected to the upper mold base via a first inclined rod; the first limiting block is disposed on the upper mold base and located on one side of the first slider, with one side of the first limiting block abutting against one side of the first slider; the bottom end of the inner forming block is provided with a connecting block, and the bottom end of the outer forming part is provided with a guide rail corresponding to the connecting block.

[0009] As a preferred embodiment of the powder metallurgy forming mold for the watch frame, the second positioning component includes a guide plate; the guide plate is provided with a second slider, a third slider, and a fourth slider distributed circumferentially; the second slider, the third slider, and the fourth slider are all slidably connected to the guide plate; the ends of the second slider, the third slider, and the fourth slider are all provided with a second limiting block disposed in the upper mold base; the second slider has a second forming block; the third slider has a third forming block; and the fourth slider has a fourth forming block.

[0010] As a preferred embodiment of the powder metallurgy forming mold for the watch frame, the third positioning component includes a fifth slider, a third limiting block, and a fifth forming block; the fifth slider is slidably disposed on the lower mold base; the third limiting block is disposed on the upper mold base and located on one side of the fifth slider, with one side of the third limiting block abutting against one side of the fifth slider; the fifth forming block is connected to the fifth slider.

[0011] As a preferred embodiment of the powder metallurgy forming mold for the watch frame, the ejection mechanism includes multiple sets of dome rods, a first inclined ejector assembly, and a second inclined ejector assembly; the multiple sets of dome rods are disposed within the push plate; the first inclined ejector assembly and the second inclined ejector assembly are circumferentially disposed within the push plate, and the first inclined ejector assembly and the second inclined ejector assembly are located outside the multiple sets of dome rods.

[0012] As a preferred embodiment of the powder metallurgy forming mold for the watch frame, the first inclined ejector assembly includes a first fixed seat and a first inclined ejector rod; the first fixed seat is disposed on the push plate; one end of the first inclined ejector rod is slidably connected to the first fixed seat, and the other end is inclinedly disposed in the lower mold core;

[0013] The second inclined ejector assembly includes a second fixed seat and a second inclined ejector rod; the second fixed seat is disposed on the push plate; one end of the second inclined ejector rod is slidably connected to the second fixed seat, and the other end is inclinedly disposed in the lower mold core; the end of the second inclined ejector rod near the lower mold core has an outwardly extending protrusion.

[0014] The powder metallurgical forming method for watch frames, using the aforementioned powder metallurgical forming mold for watch frames, includes the following steps:

[0015] S1. Adjust the upper mold base and the lower mold base to make them align, and calibrate the upper mold base and the lower mold base at the same time;

[0016] S2. Mold closing: The upper mold base approaches the lower mold base. The first sliding component, the second sliding component, and the third sliding component slide to one side of the lower mold core and abut against the lower mold core. The forming plate moves downward to above the lower mold core. A forming cavity for green blank forming is formed between the upper mold core, the lower mold core, the first sliding component, the second sliding component, the third sliding component, and the forming plate.

[0017] S3. Connect the feed port on the upper mold base to the external raw material supply equipment, and let the molten fluid flow into the flow channel structure and dispensing port through the feed port, so that the molten fluid flows into the molding cavity;

[0018] S4. After the green blank is initially formed, it is held under pressure for a period of time, and the upper and lower mold bases are cooled by a cooling mechanism.

[0019] S5. Open the mold, separate the upper mold base and the lower mold base, and slide the first sliding component, the second sliding component and the third sliding component outward towards the outside of the molding cavity. The first slider of the first sliding component first drives the inner molding part to move outward, and the inner molding part then drives the outer molding part to move inward, so that the undercuts of the inner molding part and the outer molding part on the first sliding component in different directions can be successfully demolded. Then the push plate moves upward, and the ejection mechanism lifts up the green blank and the sprue respectively, so that the green blank and the sprue are automatically discharged, making it convenient for the staff to pick up the materials.

[0020] S6. Conduct an appearance inspection on the green embryo, and also inspect whether the depth of the forming holes used on the outside of the green embryo is in place, and handle any defects.

[0021] S7. After inspection and processing, the green embryo is degreased and sintered in sequence to obtain the watch frame.

[0022] As a preferred embodiment of the powder metallurgy forming method for the watch frame, in step S1, the upper mold base and the lower mold base are cleaned, and the first row component, the second row component and the third row component are also cleaned to remove dust, impurities and other foreign objects.

[0023] As a preferred embodiment of the powder metallurgy forming method for the watch frame, in step S3, the mold temperature of the upper mold base and the lower mold base is heated to 100°C, the injection pressure is 175-190 MPa, and the injection speed is 70-80 s / m².

[0024] As a preferred embodiment of the powder metallurgy forming method for the watch frame, in step S4, the holding pressure is 100-110 MPa and the holding time is 1-2 seconds; the cooling mechanism consists of multiple sets of first cold water pipes passing through the upper mold base and multiple sets of second cold water pipes passing through the lower mold base. The multiple sets of first cold water pipes and second cold water pipes are connected end to end to form a first cooling channel and a second cooling channel. After the holding pressure is completed, the cooling mechanism is used to cool the watch for 10-12 seconds.

[0025] The beneficial effects of this invention are as follows:

[0026] By setting up a sliding mechanism and an ejection mechanism, when the mold opens, the first sliding component, the second sliding component, and the third sliding component move towards the outside of the lower mold core, and the first slider of the first sliding component first drives the inner forming part to move outward, and the inner forming part then drives the outer forming part to move inward, so that the two undercuts on the first sliding component in different directions can be demolded, thereby enabling the undercuts between the upper and lower mold bases to be demolded smoothly. At the same time, the ejection mechanism lifts the green blank, making it easier for the workers to remove the green blank and improving the material handling efficiency of the green blank. Attached Figure Description

[0027] Figure 1 A schematic diagram of the overall structure of the powder metallurgy forming mold for the watch frame provided by the present invention;

[0028] Figure 2 A schematic diagram of the internal structure of the powder metallurgy forming mold for the watch frame provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the overall structure of the row positioning mechanism provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the first row position component provided by the present invention;

[0031] Figure 5 A schematic diagram of the bottom structure of the first molding block provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the overall structure of the second row position component provided by the present invention;

[0033] Figure 7 This is a schematic diagram of the overall structure of the third row position component provided by the present invention;

[0034] Figure 8 A schematic diagram of the overall structure of the first and second inclined top components provided by the present invention;

[0035] Figure 9 This is a schematic flowchart of the powder metallurgy forming method for the watch frame provided by the present invention.

[0036] The following are the labeling elements in the figure:

[0037] 10. Upper mold base; 11. Upper mold core; 20. Lower mold base; 21. Lower mold core; 22. Ejector plate; 30. First sliding assembly; 31. First forming block; 311. Inner forming part; 312. Outer forming part; 32. First slider; 33. First limiting block; 34. Connecting block; 35. Guide rail; 40. Second sliding assembly; 41. Guide plate; 42. Second slider; 421. Second forming block; 43. Third slider; 43 1. Third forming block; 44. Fourth slider; 441. Fourth forming block; 45. Second limiting block; 50. Third moving part assembly; 51. Fifth slider; 52. Third limiting block; 53. Fifth forming block; 60. Ejection mechanism; 62. First inclined ejector assembly; 621. First fixed seat; 622. First inclined ejector rod; 63. Second inclined ejector assembly; 631. Second fixed seat; 632. Second inclined ejector rod; 633. Protrusion. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0042] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0043] In one embodiment of the present invention, such as Figure 1-8As shown, a powder metallurgy molding die for a watch frame is provided, including an upper die base 10, a lower die base 20, and a sliding mechanism. The upper die base 10 contains an upper die core 11. The lower die base 20 is located below the upper die base 10. The lower die base 20 contains a lower die core 21 corresponding to the upper die core 11. The lower die base 20 contains a push plate 22, located below the lower die core 21. The push plate 22 has an ejection mechanism 60 for ejecting the blank. The sliding mechanism includes a first sliding assembly 30, a second sliding assembly 40, and a third sliding assembly 50. The first sliding assembly 30, the second sliding assembly 40, and the third sliding assembly 50 are circumferentially disposed on the lower die base 20 and are used for forming the inner side holes of the watch frame. The upper die core 11 has two sets of symmetrically distributed forming plates corresponding to the third sliding assembly 50. The first positioning component 30 includes a first molding block 31. The first molding block 31 is slidably connected to the lower mold core 21. The first molding block 31 includes an inner molding part 311 and two sets of outer molding parts 312. The inner molding part 311 is connected to the second positioning component 40. The two sets of outer molding parts 312 are symmetrically distributed on both sides of the inner molding part 311. The outer molding parts 312 are slidably connected to the inner molding part 311.

[0044] In this embodiment, the upper mold base 10 includes a top plate and an upper mold plate arranged sequentially from top to bottom. An injection channel is provided through the center of the top plate and the upper mold plate, and a feed port for connecting to an external raw material supply device is provided between the injection channel and the top of the top plate. A flow channel structure communicating with the injection channel is formed between the upper mold core 11 and the lower mold core 21. The flow channel structure has two sides that are respectively connected to the molding cavity. Molten fluid is injected into the molding cavity through a dispensing nozzle between the flow channel structure and the molding cavity.

[0045] The lower mold base 20 includes a lower mold plate and a base arranged sequentially from top to bottom. The lower mold core 21 is located inside the lower mold plate. The push plate 22 is located in the center of the base, and a spring element for resetting is provided between the push plate 22 and the lower mold plate. By providing the elastic element, it is easy for the push plate 22 and the ejection mechanism 60 to reset their strokes after the mold is opened.

[0046] By setting up a sliding mechanism and an ejector mechanism 60, when the mold is opened, the first sliding component 30, the second sliding component 40, and the third sliding component 50 move towards the outside of the lower mold core 21, respectively. The first slider 32 of the first sliding component 30 first drives the inner forming part 311 to move outward, and the inner forming part 311 then drives the outer forming part 312 to move inward, so that the two undercuts in different directions on the first sliding component can be demolded, thereby enabling the undercuts between the upper and lower mold bases 20 to be demolded smoothly. At the same time, the ejector mechanism 60 lifts the green blank, making it easier for the workers to remove the green blank and improving the material handling efficiency of the green blank.

[0047] Preferably, the first positioning assembly 30 further includes a first slider 32 and a first limiting block 33. The first slider 32 is disposed within the lower mold base 20 and is connected to the outer forming part 312. The first sliding block is slidably connected to the upper mold base 10 via a first inclined rod. The first limiting block 33 is disposed on the upper mold base 10 and located on one side of the first slider 32, with one side of the first limiting block 33 abutting against one side of the first slider 32. The bottom end of the inner forming block is provided with a connecting block 34, and the bottom end of the outer forming part 312 is provided with a guide rail 35 corresponding to the connecting block 34.

[0048] In this embodiment, the inner molding part 311 is provided with two sets of first molding columns distributed from left to right, and the outer molding part 312 is provided with a set of second molding columns.

[0049] During mold closing, the first slider 32 moves inward, causing the inner molding part 311 to move inward as well. Under the action of the connecting block 34 and the guide rail 35, the two sets of outer molding parts 312 move closer to the inner molding part 311. The inner molding part 311 and the outer molding part 312 combine to form part of the molding cavity. The first slider 32 moves to one side of the lower mold core 21 and abuts against it. At this time, the first limiting block 33 moves downward, and one side of the bottom end of the first limiting block 33 abuts against the other side of the first slider 32, thereby limiting the position of the first slider 32 and preventing it from shifting due to excessive pressure during injection molding, thus improving the production quality of the green blank.

[0050] Furthermore, the second positioning assembly 40 includes a guide plate 41. The guide plate 41 is provided with a second slider 42, a third slider 43, and a fourth slider 44 distributed circumferentially. The second slider 42, the third slider 43, and the fourth slider 44 are all slidably connected to the guide plate 41. Each of the second slider 42, the third slider 43, and the fourth slider 44 has a second limiting block 45 located within the upper mold base 10 at its end. The second slider 42 has a second forming block 421. The third slider 43 has a third forming block 431. The fourth slider 44 has a fourth forming block 441.

[0051] In this embodiment, the second molding block 421, the third molding block 431, and the fourth molding block 441 are respectively provided with a third molding post, a fourth molding post, and a fifth molding post. The second limiting block 45 is slidably connected to the second slider 42, the third slider 43, and the fourth slider 44 via a second inclined rod, a third inclined rod, and a fourth inclined rod, respectively.

[0052] During mold closing, the second slider 42, the third slider 43, and the fourth slider 44 move inward to one side of the lower mold core 21 under the action of the guide plate 41, and abut against the lower mold core 21. At this time, the three sets of second limiting blocks 45 move downward, and one side of the bottom of the three sets of second limiting blocks 45 abuts against the other side of the second slider 42, the third slider 43, and the fourth slider 44 respectively, thereby limiting the position of the second slider 42, the third slider 43, and the fourth slider 44, preventing the second slider 42, the third slider 43, and the fourth slider 44 from shifting due to excessive pressure during injection molding, and improving the production quality of the green blank.

[0053] Furthermore, the third positioning component 50 includes a fifth slider 51, a third limiting block 52, and a fifth forming block 53. The fifth slider 51 is slidably disposed on the lower mold base 20. The third limiting block 52 is disposed on the upper mold base 10 and located on one side of the fifth slider 51, with one side of the third limiting block 52 abutting against one side of the fifth slider 51. The fifth forming block 53 is connected to the fifth slider 51.

[0054] In this embodiment, the fifth forming block 53 is provided with two sets of oppositely distributed sixth forming pillars. The third limiting block 52 and the fifth slider 51 are slidably connected by a fifth inclined rod.

[0055] During mold closing, the fifth slider 51 moves inward to one side of the lower mold core 21 and abuts against it. At this time, the third limiting block 52 moves downward, and one side of the bottom end of the third limiting block 52 abuts against the other side of the fifth slider 51, thereby limiting the position of the fifth slider 51 and preventing it from shifting due to excessive pressure during injection molding, thus improving the production quality of the green blank.

[0056] Preferably, the ejection mechanism 60 includes multiple sets of dome rods, a first inclined ejector assembly 62, and a second inclined ejector assembly 63. The multiple sets of dome rods are disposed within the push plate 22. The first inclined ejector assembly 62 and the second inclined ejector assembly 63 are circumferentially disposed within the push plate 22, and the first inclined ejector assembly 62 and the second inclined ejector assembly 63 are located outside the multiple sets of dome rods.

[0057] When the mold is opened, the push plate 22 is pushed upward, which drives the round ejector rod, the first inclined ejector assembly 62 and the second inclined ejector assembly 63 to move upward, ejecting the green blank and the sprue material at the same time, thereby realizing the automatic discharge of the green blank and the sprue material at the same time, simplifying the discharge steps and improving production efficiency.

[0058] Specifically, the first inclined ejector assembly 62 includes a first fixed base 621 and a first inclined ejector rod 622. The first fixed base 621 is disposed on the push plate 22. One end of the first inclined ejector rod 622 is slidably connected to the first fixed base 621, and the other end is inclinedly disposed in the lower mold core 21.

[0059] The second inclined ejector assembly 63 includes a second fixed base 631 and a second inclined ejector rod 632. The second fixed base 631 is disposed on the push plate 22. One end of the second inclined ejector rod 632 is slidably connected to the second fixed base 631, and the other end is inclinedly disposed in the lower mold core 21. The end of the second inclined ejector rod 632 near the lower mold core 21 has an outwardly extending protrusion 633, which is cylindrical.

[0060] By setting the first inclined ejector rod 622 and the second inclined ejector rod 632, when the mold is opened, the first inclined ejector rod 622 and the second inclined ejector rod 632 move upward with the push plate 22, pushing the green blank upward, and the tops of the first inclined ejector rod 622 and the second inclined ejector rod 632 gradually move away from the side wall of the green blank, so as to avoid the tops of the first inclined ejector rod 622 and the second inclined ejector rod 632 forming an undercut to prevent the green blank from being ejected when the material is removed.

[0061] In one embodiment of the present invention, such as Figure 9 As shown, the powder metallurgy forming method for the watch frame, using the aforementioned powder metallurgy forming mold for the watch frame, includes the following steps:

[0062] S1. Adjust the upper mold base 10 and lower mold base 20 to ensure they are properly aligned. During adjustment, clean the upper mold base 10 and lower mold base 20, as well as the first row component 30, second row component 40, and third row component 50, removing dust, impurities, and other foreign matter. Ensure the cleanliness of the upper mold base 10, lower mold base 20, first row component 30, second row component 40, and third row component 50 to guarantee the forming effect of the green blank. Furthermore, fine-tune the opening and closing stroke between the upper mold base 10 and lower mold base 20 according to different specifications of watch frames to ensure that the upper mold base 10 and lower mold base 20 can fully open and close, preventing damage to the powder metallurgy forming mold due to insufficient opening and closing stroke.

[0063] Simultaneously, the upper mold base 10 and the lower mold base 20 are calibrated to prevent misalignment between them and ensure the molding quality of the green blank.

[0064] S2. The mold is closed. The upper mold base 10 approaches the lower mold base 20. The first sliding component 30, the second sliding component 40, and the third sliding component 50 slide to one side of the lower mold core 21 and abut against it. The forming plate moves downward to above the lower mold core 21. A forming cavity for green blank forming is formed between the upper mold core 11, the lower mold core 21, the first sliding component 30, the second sliding component 40, the third sliding component 50, and the forming plate.

[0065] S3. Connect the feed port on the upper mold base 10 to the external raw material supply equipment, and let the molten fluid flow into the flow channel structure and dispensing port through the feed port, so that the molten fluid flows into the molding cavity.

[0066] The upper mold base 10 and lower mold base 20 are heated to 100℃, the injection pressure is 175-190 MPa, and the injection speed is 70-80 s / m². During molten fluid injection, the mold temperature of the upper mold base 10 and lower mold base 20 is controlled within 100℃, allowing the molten fluid to flow better into the molding cavity, preventing solidification that could affect the molding effect of the green body, and improving the production quality of the green body.

[0067] S4. After the green blank is initially formed, it is held under pressure for a period of time, and the upper mold base 10 and the lower mold base 20 are cooled by the cooling mechanism.

[0068] The holding pressure is 100-110 MPa for 1-2 seconds. This pressure holding replenishes the molten fluid in the molding cavity, ensuring a more complete molding of the green body and preventing material shortages or incomplete filling. After pressure holding, the green body is cooled for 10-12 seconds by a cooling mechanism consisting of multiple sets of first and second cold water pipes running through the upper mold base 10 and the lower mold base 20, respectively. These pipes are connected end-to-end to form first and second cooling channels. The first and second cooling channels are located within the upper mold base 10 and lower mold base 20, respectively, and are situated outside the molding cavity. Injecting external cold water into the first and second cooling channels cools the molding cavity, allowing the green body to cool rapidly and improving both molding and cooling efficiency.

[0069] S5. Open the mold, separate the upper mold base 10 and the lower mold base 20. The first sliding component 30, the second sliding component 40 and the third sliding component 50 slide out toward the outside of the molding cavity. The first slider 32 of the first sliding component 30 first drives the inner molding part 311 to move outward, and the inner molding part 311 then drives the outer molding part 312 to move inward, so that the undercuts of the inner molding part 311 and the outer molding part 312 on the first sliding component 30 in different directions can be successfully demolded. Then the push plate 22 moves upward, and the ejection mechanism 60 lifts the green blank and the sprue material respectively, so that the green blank and the sprue material are automatically discharged, which is convenient for the staff to pick up the materials.

[0070] S6. Conduct a visual inspection of the green blank, and also inspect whether the forming holes used on the outer side of the green blank are formed to the required depth, and handle any defects. The inspection steps are as follows: classify the green blanks according to whether the surface is intact, into good products and defective products. Among the good products, classify them further according to whether there are flashes on the edges, into qualified products and trimmed products. Trim the flashes on the trimmed products and transfer them to the next processing step together with the qualified products.

[0071] S7. After inspection and processing, the green blanks are degreased and sintered sequentially to obtain the watch frame. The green blanks are degreased to remove plastic, removing organic mixtures, and then sintered in a sintering furnace to obtain the watch frame.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A powder metallurgy forming mold for a watch frame, characterized in that, include: Upper mold base, wherein an upper mold core is provided inside the upper mold base; A lower mold base is provided below the upper mold base; a lower mold core corresponding to the upper mold core is provided inside the lower mold base; a push plate is provided inside the lower mold base, and the push plate is located below the lower mold core; an ejection mechanism for ejecting the blank is provided on the push plate; The sliding mechanism includes a first sliding component, a second sliding component, and a third sliding component; the first sliding component, the second sliding component, and the third sliding component are circumferentially disposed on the lower mold base, and the first sliding component, the second sliding component, and the third sliding component are used for forming the inner side hole of the watch frame; the upper mold core is provided with two sets of symmetrically distributed forming plates corresponding to the third sliding component; The first positioning component includes a first forming block; the first forming block is slidably connected to the lower mold core, and the first forming block includes an inner forming part and two sets of outer forming parts; the inner forming part is connected to the second positioning component; the two sets of outer forming parts are symmetrically distributed on both sides of the inner forming part; the outer forming parts are slidably connected to the inner forming part.

2. The powder metallurgy forming mold for the watch frame according to claim 1, characterized in that, The first positioning component further includes a first slider and a first limiting block; the first slider is disposed in the lower mold base and is connected to the outer forming part; the first sliding block is slidably connected to the upper mold base through a first inclined rod; the first limiting block is disposed on the upper mold base and is located on one side of the first slider, and one side of the first limiting block abuts against one side of the first slider; the bottom end of the inner forming block is provided with a connecting block, and the bottom end of the outer forming part is provided with a guide rail corresponding to the connecting block.

3. The powder metallurgy forming mold for the watch frame according to claim 2, characterized in that, The second sliding component includes a guide plate; the guide plate is provided with a second slider, a third slider and a fourth slider distributed circumferentially; the second slider, the third slider and the fourth slider are all slidably connected to the guide plate; the ends of the second slider, the third slider and the fourth slider are all provided with a second limiting block disposed in the upper mold base; the second slider has a second forming block; the third slider has a third forming block; and the fourth slider has a fourth forming block.

4. The powder metallurgy forming mold for the watch frame according to claim 3, characterized in that, The third positioning component includes a fifth slider, a third limiting block, and a fifth forming block; the fifth slider is slidably disposed on the lower mold base; the third limiting block is disposed on the upper mold base and located on one side of the fifth slider, with one side of the third limiting block abutting against one side of the fifth slider; the fifth forming block is connected to the fifth slider.

5. The powder metallurgy forming mold for the watch frame according to claim 1, characterized in that, The ejection mechanism includes multiple sets of dome rods, a first inclined ejector assembly, and a second inclined ejector assembly; the multiple sets of dome rods are disposed within the push plate; the first inclined ejector assembly and the second inclined ejector assembly are circumferentially disposed within the push plate, and the first inclined ejector assembly and the second inclined ejector assembly are located outside the multiple sets of dome rods.

6. The powder metallurgy forming mold for the watch frame according to claim 5, characterized in that, The first inclined ejector assembly includes a first fixed seat and a first inclined ejector rod; the first fixed seat is disposed on the push plate; one end of the first inclined ejector rod is slidably connected to the first fixed seat, and the other end is inclinedly disposed in the lower mold core; The second inclined ejector assembly includes a second fixed seat and a second inclined ejector rod; the second fixed seat is disposed on the push plate; one end of the second inclined ejector rod is slidably connected to the second fixed seat, and the other end is inclinedly disposed in the lower mold core; the end of the second inclined ejector rod near the lower mold core has an outwardly extending protrusion.

7. A powder metallurgy forming method for a watch frame, using the powder metallurgy forming mold for a watch frame as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Adjust the upper mold base and the lower mold base to make them align, and calibrate the upper mold base and the lower mold base at the same time; S2. Mold closing: The upper mold base approaches the lower mold base. The first sliding component, the second sliding component, and the third sliding component slide to one side of the lower mold core and abut against the lower mold core. The forming plate moves downward to above the lower mold core. A forming cavity for green blank forming is formed between the upper mold core, the lower mold core, the first sliding component, the second sliding component, the third sliding component, and the forming plate. S3. Connect the feed port on the upper mold base to the external raw material supply equipment, and let the molten fluid flow into the flow channel structure and dispensing port through the feed port, so that the molten fluid flows into the molding cavity; S4. After the green blank is initially formed, it is held under pressure for a period of time, and the upper and lower mold bases are cooled by a cooling mechanism. S5. Open the mold, separate the upper mold base and the lower mold base, and slide the first sliding component, the second sliding component and the third sliding component outward towards the outside of the molding cavity. The first slider of the first sliding component first drives the inner molding part to move outward, and the inner molding part then drives the outer molding part to move inward, so that the undercuts of the inner molding part and the outer molding part on the first sliding component in different directions can be successfully demolded. Then the push plate moves upward, and the ejection mechanism lifts up the green blank and the sprue respectively, so that the green blank and the sprue are automatically discharged, making it convenient for the staff to pick up the materials. S6. Conduct an appearance inspection on the green embryo, and also inspect whether the depth of the forming holes used on the outside of the green embryo is in place, and handle any defects. S7. After inspection and processing, the green embryo is degreased and sintered in sequence to obtain the watch frame.

8. The powder metallurgy forming method for the watch frame according to claim 7, characterized in that, In step S1, the upper mold base and the lower mold base are cleaned, and the first row component, the second row component and the third row component are also cleaned to remove dust, impurities and other foreign objects.

9. The powder metallurgy forming method for the watch frame according to claim 7, characterized in that, In step S3, the mold temperature of the upper mold base and the lower mold base is heated to 100°C, the injection pressure is 175-190 MPa, and the injection speed is 70-80 s / m².

10. The powder metallurgy forming method for the watch frame according to claim 7, characterized in that, In step S4, the pressure holding time is 100-110 MPa and the holding time is 1-2 seconds. The cooling mechanism consists of multiple sets of first cold water pipes passing through the upper mold base and multiple sets of second cold water pipes passing through the lower mold base. The multiple sets of first cold water pipes and second cold water pipes are connected end to end to form a first cooling channel and a second cooling channel. After the pressure holding is completed, the cooling mechanism cools the pipes for 10-12 seconds.

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