A powder pressing tool and pressing method for anti-adhesion conical surface forming

Abstract

This invention discloses a powder pressing tool and method for anti-adhesion conical surface molding, comprising a core rod, a guide mold and a first pressing head sleeved on the outer side of the core rod, a mold sleeve sleeved on the outer side of the guide mold, and an inlet section extending into the inner wall of the mold sleeve on the end face of the first pressing head; a mold cavity for accommodating powder is formed between the upper end face of the guide mold, the lower end face of the inlet section, the inner wall of the mold sleeve and the outer wall of the core rod; the beneficial effects of this invention are: during demolding, the mold sleeve is removed first, and the first pressing head can be easily removed. At this time, the mold cavity is opened, and the molded powder product can be smoothly removed, which not only avoids the adhesion between the product and the inner wall of the mold cavity, but also eliminates the need to clean the inner wall of the mold cavity, facilitating the pressing of the next product; the guide mold adopts three guide molds sleeved in sequence, and slight shaking can occur between the three guide molds during demolding, improving the stability of demolding and ensuring product quality.

Description

Technical Field

[0001] This invention relates to the field of powder forming tool technology, and in particular to a powder pressing tool and pressing method for anti-sticking conical surface forming. Background Technology

[0002] Powder compression molding is a forming method that utilizes external pressure in a mold. Its molding process includes powder loading, compression, and demolding. In traditional powder compression molding, the demolding mechanism, under the action of a guiding mechanism, pushes the lower mold upwards, thereby ejecting the formed product from the mold cavity. However, this type of demolding mechanism in powder compression molding has the following problems:

[0003] First, because powder easily sticks to the inner wall of the mold cavity during the pressing process, once the product is pushed out of the mold cavity by external force, the product surface is easily damaged, so the product qualification rate is low.

[0004] Secondly, considering the need to ensure a high pass rate, the inner wall of the mold cavity must be treated after each mold opening. This results in very low demolding efficiency and significantly reduces production efficiency.

[0005] For example, the patent with publication number "CN218080399U" discloses a powder pressing mold and heater. After the molding is completed, the upper mold assembly needs to be pressed down to squeeze the molded powder out of the mold cavity. In this process, the surface of the molded product will be damaged. Summary of the Invention

[0006] The purpose of this invention is to provide a powder pressing tool for anti-adhesion conical surface molding, which allows for easy opening of the mold cavity to remove the molded powder during demolding, reducing adhesion between the product and the inner wall of the mold cavity, improving the product qualification rate, and increasing production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A powder pressing tool for anti-adhesion conical surface forming includes a core rod, a guide mold and a first pressing head are sleeved on the outside of the core rod, a mold sleeve is sleeved on the outside of the guide mold, and an inlet section extending into the inner wall of the mold sleeve is provided on the end face of the first pressing head.

[0009] A mold cavity for containing powder is formed between the upper end face of the guide mold, the lower end face of the inlet section, the inner wall of the mold sleeve, and the outer wall of the core rod.

[0010] Preferably, the upper end face of the guide mold is a conical surface.

[0011] Preferably, the guide mold includes a first guide mold, a second guide mold, and a third guide mold that are sequentially nested from the inside out. The conical surface is continuously formed on the upper end surfaces of the first and second guide molds, and the upper end surface of the third guide mold is lower than the upper end surface of the second guide mold.

[0012] Preferably, the lower part of the first guide mold is provided with a first step that cooperates with and positions the second guide mold, and the lower part of the second guide mold is provided with a second step that cooperates with and positions the third guide mold.

[0013] Preferably, a third step is provided on the outer side of the third guide mold, and an insert plate is inserted between the third step and the mold sleeve.

[0014] Preferably, the insert plate has an opening, the size of which is not less than the outer diameter of the third guide mold.

[0015] Preferably, a second pressure head is provided at the bottom of the guide mold, and the second pressure head has a first end face that contacts and cooperates with the bottom surface of the third guide mold;

[0016] The first end face is provided with a second end face that contacts and mates with the bottom surface of the second guide mold;

[0017] The second end face is provided with a third end face that contacts and mates with the bottom surface of the third guide mold.

[0018] Preferably, the outer wall of the mold sleeve is provided with a protruding pressure plate.

[0019] This invention also discloses a pressing method for a powder pressing tool with an anti-adhesion conical surface, comprising the following steps:

[0020] S1, Tool assembly: Place the first end face of the second pressure head on the workbench, place the third guide mold and install the second guide mold, the first guide mold and the core rod in sequence, then put the mold sleeve into the third guide mold, and finally insert the insert plate.

[0021] S2, Powder loading: The powder is loaded into the mold cavity formed by the mold sleeve, guide mold, and core rod. Then, the first pressure head is installed on the core rod and the first pressure head is pressed down to make its guide section enter the inner wall of the mold sleeve.

[0022] S3, Powder Compression Molding: Rotate the pressing tool 180° until the second pressing head is on top, remove the insert plate, and press down the second pressing head with the hydraulic press to form the powder;

[0023] S4, Powder Demolding: Rotate the pressing tool 180° again until the first pressing head is on top. Fit the pressing cylinder onto the outside of the mold sleeve, with the top of the pressing cylinder higher than the pressing tool. Press down the pressing cylinder with the hydraulic press to make the mold sleeve fall off. Remove the pressing cylinder and the first pressing head, and take out the formed powder.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. When demolding, first remove the mold sleeve, and the first press head can be easily removed. At this time, the mold cavity is open, and the molded powder product can be smoothly removed. This not only avoids the product from sticking to the inner wall of the mold cavity, but also eliminates the need to clean the inner wall of the mold cavity, making it convenient to press the next product.

[0026] 2. The guide mold uses three guide molds that are nested together in sequence. During demolding, slight shaking can occur between the three guide molds, which improves the stability of demolding and ensures product quality.

[0027] 3. Steps for positioning are provided between the three guide molds, and three end faces for positioning are provided between the second pressure plate and the three guide molds to facilitate the assembly of this tool. Attached Figure Description

[0028] Figure 1 This is an exploded view of the present invention;

[0029] Figure 2 This is an assembly diagram of the present invention;

[0030] Figure 3 This is a cross-sectional view of the present invention;

[0031] Figure 4 This is a schematic diagram of step S3 in the pressing method of the present invention;

[0032] Figure 5 This is a schematic diagram of step S4 in the pressing method of the present invention.

[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1 — Figure 3 As shown, an embodiment of the present invention provides a powder pressing tool for anti-adhesion conical surface forming, including a core rod 2, a guide mold and a first pressing head 1 sleeved on the outside of the core rod 2, a mold sleeve 6 sleeved on the outside of the guide mold, and an inlet section 11 extending into the inner wall 61 of the mold sleeve provided on the end face of the first pressing head 1.

[0037] The upper end face of the guide mold, the lower end face of the inlet section 11, the inner wall 61 of the mold sleeve 6 and the outer wall of the core rod 2 form a mold cavity to accommodate powder. After the powder is poured into the mold cavity, the first pressure head 1 is pressed down to make it initially formed. When demolding, the first pressure head 1 can be easily removed after the mold sleeve 6 is removed, and then the mold cavity can be opened to take out the formed product.

[0038] The upper end face of the guide mold is set as a conical surface 32.

[0039] The guide mold includes a first guide mold 3, a second guide mold 4, and a third guide mold 5, which are sequentially nested from the inside out. All three are cylindrical. A conical surface 32 is continuously formed on the upper end face of the first guide mold 3 and the second guide mold 4. The contact points of the outer wall of the first guide mold 3 and the inner wall of the second guide mold 4 are at the same height, so that the conical surface 32 is continuous and does not break. The upper end face of the third guide mold 5 is lower than the upper end face of the second guide mold 4.

[0040] The lower part of the first guide mold 3 is provided with a first step 31 that cooperates with and positions the second guide mold 4, and the lower part of the second guide mold 4 is provided with a second step 41 that cooperates with and positions the third guide mold 5. The steps serve a positioning function when the three guide molds are installed and fitted in sequence, facilitating proper installation.

[0041] A third step 51 is provided on the outer side of the third guide mold 5. An insert plate 7 is inserted between the third step 51 and the mold sleeve 6. The third step 51 is used to receive the insert plate 7 and support the mold sleeve 6 so that it is higher than the guide mold to form a mold cavity.

[0042] The insert plate 7 has an opening, the size of which is not less than the outer diameter of the third guide mold 5, thereby facilitating the installation and removal of the insert plate 7.

[0043] A second pressure head 8 is provided at the bottom of the guide mold. The second pressure head 8 has a first end face 81 that contacts and engages with the bottom surface of the third guide mold 5. A second end face 82 that contacts and engages with the bottom surface of the second guide mold 4 is provided within the first end face 81. A third end face 83 that contacts and engages with the bottom surface of the third guide mold 5 is provided within the second end face 82. By providing end faces of different heights, it is convenient to install and position each part during tool assembly, allowing operators to easily install it in place for product manufacturing. In this embodiment, the second end face and the third end face protrude sequentially from the first end face. In some embodiments, however, they may be sequentially recessed into the first end face; or the second end face may protrude from the first end face, and the third end face may be recessed into the second end face, etc.

[0044] like Figure 5 As shown, the outer wall of the mold sleeve 6 is provided with a protruding pressure plate 62. During demolding, the pressure plate 62 is used to support the pressing cylinder 9 and to remove the mold sleeve 6 from the pressing tool.

[0045] During the pressing process, the first pressing head 1 is initially pressed into the mold sleeve 6, followed by the pressing head 8, which forms the powder. During demolding, the mold sleeve 6 is removed first, and then the first pressing head 1 is taken out. At this point, the mold cavity opens, allowing for easy removal of the molded product. Depending on the adhesion and size of the powder product, the number of guide molds can be adjusted. When the viscosity between the powder and the mold cavity is high, the number of guide molds can be increased, such as by inserting a fourth and fifth guide mold between the first guide mold 3 and the second guide mold 4. Conversely, when the viscosity between the powder and the mold cavity is low, the number of guide molds can be reduced, such as by merging the first guide mold 3 and the second guide mold 4, or even by combining the first guide mold 3, the second guide mold 4, and the third guide mold 5 into a single unit.

[0046] Example 2

[0047] This invention also discloses a pressing method for a powder pressing tool with an anti-adhesion conical surface, comprising the following steps:

[0048] S1, Tool assembly: Place the second pressure head 8 with its first end face 81 facing upward on the workbench, place the third guide mold 5 and then install the second guide mold 4, the first guide mold 3 and the core rod 2 in sequence. Through the setting of the second end face 82, the third end face 83 and the first step 31 and the second step 41, the parts can be conveniently installed and positioned so that they can be installed smoothly. Then, put the mold sleeve 6 into the third guide mold 5 and finally insert the insert plate 7.

[0049] S2, Powder loading: Load the powder into the mold cavity formed by the mold sleeve 6, guide mold and core rod 2, then install the first pressure head 1 on the core rod 2, manually press down the first pressure head 1 so that its guide section enters the inner wall 61 of the mold sleeve, so that the powder is initially formed.

[0050] S3, Powder Compression Molding: Rotate the pressing tool 180° until the second pressing head is on top, remove the insert plate 7, and press down the second pressing head of the hydraulic press to form powder; the hydraulic press holds pressure for 1 second during the pressing process, with constant pressure and quantitative control. According to the size of the tool and the size of the product, the limit switch is used to adjust the stroke of the hydraulic press. The PLC controls the hydraulic press to move down, hold pressure and move up quickly.

[0051] S4, Powder Demolding: Rotate the pressing tool 180° again until the first pressing head 1 is on top. Fit the pressing cylinder 9 onto the outside of the mold sleeve 6. The inner diameter of the pressing cylinder 9 is larger than the outer diameter of the mold sleeve 6 and smaller than the outer diameter of the pressure plate 62. The top of the pressing cylinder 9 is higher than the pressing tool. When the hydraulic press presses down on the pressing cylinder 9, the mold sleeve 6 is dislodged from the connection with the first pressing head 1. Remove the pressing cylinder 9. Since the first guide mold 3, the second guide mold 4 and the third guide mold 5 are fitted together and are not a whole, there are small gaps between the guide molds. A slight vibration is generated during demolding, so that the product can be easily demolded without causing material sticking due to the large conical area. Then remove the first pressing head 1, and the formed powder can be taken out.

[0052] Using this pressing tool can improve the stability of the product during demolding, thereby increasing the product qualification rate.

[0053] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not 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 limiting the scope of protection of this invention.

[0055] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressing method for a powder pressing tool with an anti-adhesion conical surface, characterized in that, A powder pressing tool is used, which includes a core rod, a guide mold and a first pressing head are sleeved on the outside of the core rod, a mold sleeve is sleeved on the outside of the guide mold, and an inlet section extending into the inner wall of the mold sleeve is provided on the end face of the first pressing head. A mold cavity for containing powder is formed between the upper end face of the guide mold, the lower end face of the inlet section, the inner wall of the mold sleeve, and the outer wall of the core rod. The upper end face of the guide mold is set as a conical surface; The guide mold includes a first guide mold, a second guide mold, and a third guide mold that are sequentially nested from the inside out. The conical surface is continuously formed on the upper end surfaces of the first and second guide molds, and the upper end surface of the third guide mold is lower than the upper end surface of the second guide mold. The outer side of the third guide mold is provided with a third step, and an insert plate is inserted between the third step and the mold sleeve; The bottom of the guide mold is provided with a second pressure head, and the second pressure head has a first end face that contacts and cooperates with the bottom surface of the third guide mold; The first end face is provided with a second end face that contacts and mates with the bottom surface of the second guide mold; The second end face is provided with a third end face that contacts and mates with the bottom surface of the third guide mold; The suppression method includes the following steps: S1, Tool assembly: Place the first end face of the second pressure head on the workbench, place the third guide mold and install the second guide mold, the first guide mold and the core rod in sequence, then put the mold sleeve into the third guide mold, and finally insert the insert plate. S2, Powder loading: The powder is loaded into the mold cavity formed by the mold sleeve, guide mold, and core rod. Then, the first pressure head is installed on the core rod and the first pressure head is pressed down to make its guide section enter the inner wall of the mold sleeve. S3, Powder Compression Molding: Rotate the pressing tool 180° until the second pressing head is on top, remove the insert plate, and press down the second pressing head with the hydraulic press to form the powder; S4, Powder Demolding: Rotate the pressing tool 180° again until the first pressing head is on top. Fit the pressing cylinder onto the outside of the mold sleeve, with the top of the pressing cylinder higher than the pressing tool. Press down the pressing cylinder with the hydraulic press to make the mold sleeve fall off. Remove the pressing cylinder and the first pressing head, and take out the formed powder.

2. The pressing method for a powder pressing tool for forming an anti-adhesion conical surface according to claim 1, characterized in that, The lower part of the first guide mold is provided with a first step that cooperates with and positions the second guide mold, and the lower part of the second guide mold is provided with a second step that cooperates with and positions the third guide mold.

3. The pressing method for a powder pressing tool for forming an anti-adhesion conical surface according to claim 1, characterized in that, The insert plate has an opening, the size of which is not less than the outer diameter of the third guide mold.

4. The pressing method for a powder pressing tool for forming an anti-adhesion conical surface according to claim 1, characterized in that, The outer wall of the mold is provided with a protruding pressure plate.

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