A dry-pressed ceramic plate for metal powder molding

Abstract

This utility model relates to the field of material forming technology, specifically to a dry-pressed ceramic plate for metal powder forming. It has a first forming concave-convex portion with multiple draft angles. At least one draft angle of the first forming concave-convex portion is designated as the first draft angle. The angle between the first draft angle and other draft angles is defined as the draft angle, which can be a chamfered or rounded structure. This utility model reduces the bonding area between the dry-pressing mold and the ceramic plate at the draft angle by setting the draft angle to a chamfered or rounded structure, thereby reducing the bonding force and demolding difficulty. It can directly form ceramic plates with small draft angles (e.g., less than 15°) without further machining, reducing costs and improving efficiency. It solves the problem that existing dry-pressed ceramic plates cannot be directly formed with small draft angles and can also serve as a standard mold structure for forming various types of dry-pressed ceramic plates in subsequent designs.

Description

Technical Field

[0001] This utility model relates to the field of material forming technology, specifically to a dry-pressed ceramic plate for metal powder forming. Background Technology

[0002] Metal powder molding (MIM) is a process used to manufacture metal parts. MIM molding includes steps such as feeding, injection molding, debinding, and sintering. The sintering step, due to its high temperature (typically 1000-2000℃), requires a ceramic plate to support the metal part and prevent deformation caused by metal melting during the high-temperature sintering process. Therefore, the structure of the ceramic plate should closely fit the structure of the metal part. The higher the molding precision of the metal part, the greater the fit between the ceramic plate and the metal part, and correspondingly, the higher the precision requirements for the ceramic plate. Ceramic materials are usually formed using dry pressing, which creates a cavity that fits the metal part. Dry pressing involves filling ceramic powder into a dry pressing mold and pressing it under certain pressure, causing mechanical bonding and displacement between the powder particles, thereby forming a dry-pressed ceramic plate with a specific shape and strength.

[0003] Dry-pressed ceramic plates are prone to sticking to the dry-pressing mold after dry pressing. Insufficient draft angles can lead to chipped corners, cracks, and other damage to the product. Therefore, to ensure reliable demolding, the draft angle of dry-pressed ceramic plates is typically greater than 30°. This has little impact on larger metal products. However, for smaller metal products, an excessively large draft angle results in an insufficient support surface, failing to meet the dimensional requirements. This is particularly true for small, high-precision metal parts such as mobile phone components, where a large draft angle has a greater impact.

[0004] To sinter metal parts with higher precision, the cavity of the ceramic plate needs to have a smaller draft angle. However, as mentioned above, a draft angle that is too small is not conducive to the demolding of the dry-pressed ceramic plate. Therefore, the existing processing method is to first dry-press the ceramic plate with a large draft angle to ensure smooth demolding; then, CNC machining is used to further cut off excess ceramic material to reduce the draft angle so that it meets the requirements of the metal part. This processing method is costly and inefficient, and cannot meet the requirements of cost reduction and efficiency improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a dry-pressed ceramic plate for metal powder molding, so as to solve the problem that existing dry-pressed ceramic plates require further processing after being formed at a large demolding angle, resulting in high cost and low efficiency.

[0006] To achieve the above objectives, the technical solution of this utility model includes: A dry-pressed ceramic plate for metal powder molding has a first molding concave-convex portion, the first molding concave-convex portion having a plurality of draft angles, wherein at least one of the draft angles of the first molding concave-convex portion is a first draft angle, and the angle between the first draft angle and the other draft angles is defined as a draft angle, the draft angle being a chamfered structure or a rounded corner structure.

[0007] In one embodiment, the first molding protrusion has a plurality of protrusions and concaves, and the draft slope of each first molding protrusion and concave is the first draft slope, so that the draft angle of each first molding protrusion and concave is the angle between any first draft slope and other first draft slopes.

[0008] In one embodiment, each of the first molding protrusions has three of the first draft slopes.

[0009] In one embodiment, the first forming protrusion is a groove with three draft bevels, and the three sidewalls are connected in sequence to form two draft angles.

[0010] In one embodiment, the first molding protrusion has a plurality of protrusions and concave portions, and a second draft angle is provided between adjacent first molding protrusions and concave portions, wherein the included angle between the first draft angle and the second draft angle is the draft angle.

[0011] In one embodiment, the first draft slope is a draft slope that poses a risk of damaging the ceramic product after dry pressing of the ceramic plate, and the second draft slope is a draft slope other than the first draft slope; the draft angle of the first draft slope is smaller than the draft angle of the second draft slope.

[0012] In one embodiment, the draft angle of the first draft slope is less than 30°, and the draft angle of the second draft slope is greater than or equal to 30°.

[0013] In one embodiment, a parting surface is provided between adjacent first molding protrusions and recesses, and the connection between the parting surface and the second draft angle is a chamfered structure or a rounded corner structure.

[0014] In one embodiment, the draft angle of the first draft slope is less than 30°, and the depth of the first draft slope is greater than 1.4 mm.

[0015] In one embodiment, the draft angle of the first draft slope is 15°, and the depth of the first draft slope is 1.4 mm.

[0016] The beneficial effects of this utility model are: This invention sets the draft angle as a chamfered or rounded structure, making the transition between the first draft angle and other draft angles smoother and reducing the bonding area between the mold and the product at the draft angle, thereby reducing the bonding force and demolding difficulty. It can directly form ceramic plates with small draft angles (e.g., less than 15°) without further machining, reducing costs and improving efficiency. It solves the problem that existing dry-pressed ceramic plates cannot be directly formed with small draft angles, and can also serve as a standard mold structure for the forming of various dry-pressed ceramic plates in subsequent designs. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0018] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 yes Figure 1 A magnified view of a section at point B. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] See Figures 1 to 3 As shown, this utility model discloses a dry-pressed ceramic plate for metal powder molding, having multiple first molding protrusions and concave portions 10, each of which has multiple draft slopes 11. In this embodiment, the first molding protrusions and concave portions 10 are grooves with three draft slopes 11, i.e., first molding recesses 1. In other embodiments, the first molding protrusions and concave portions 10 can also be raised molding protrusions. Both the molding protrusions and molding recesses have draft slopes 11, and the draft slopes 11 of the two are opposite. This embodiment uses a molding recess as an example for explanation.

[0022] In this embodiment, each first molding recess 1 has a draft slope 11, which is a first draft slope 111. A second draft slope 112 is provided between adjacent first molding recesses 1. The angle between the first draft slope 111 and other draft slopes 11 is defined as the draft angle 100. The other draft slopes are not limited to the first draft slope 111. Specifically, in this embodiment, the angle between adjacent first draft slopes 111 is the draft angle 100, and the angle between the first draft slope 111 and the second draft slope 112 is also the draft angle 100. The draft angle 100 is a rounded corner structure R. The specific value of the rounded corner structure is determined according to the size of the draft slope 11, and is not limited here.

[0023] As a support and anti-misalignment structure for metal products during the sintering process, the dry-pressed ceramic plate has at least one cavity for supporting and positioning the sintered metal product. Correspondingly, the dry-pressed ceramic plate has at least one first forming recess 1. In this embodiment, the dry-pressed ceramic plate has multiple first forming recesses 1. The draft angle 11 of each first forming recess 1 can be either entirely a first draft angle 111, or partly a first draft angle 111 and partly a second draft angle 112. The difference between the first and second draft angles is that the draft angle of the first draft angle 111 is smaller than that of the second draft angle 112, and the draft angle of the first draft angle 111 is less than 30°, while the draft depth is greater than 1.4mm. This is the draft angle that poses a risk of chipping, cracking, or other damage to the ceramic product. Verification has shown that when the draft depth is greater than 1.4mm and the draft angle is less than 30°, the dry-pressed ceramic plate carries the risk of chipping, cracking, or other damage to the ceramic product during the dry-pressing process. The second draft slope 112 is a draft slope other than the first draft slope 111. It refers to a draft slope whose draft angle can facilitate demolding. Even if no rounded corner structure is provided at the intersection of the second draft slope and other draft slopes, demolding can be carried out smoothly. Specifically, it is a draft slope with a draft angle greater than or equal to 30° when the draft depth is 1.4mm.

[0024] In this embodiment, the draft angle of the first draft slope 111 is 15° and the draft depth is 1.4mm, while the draft angle of the second draft slope 112 is 35°.

[0025] The first draft angle 111 and the second draft angle 112 referred to in this utility model are distinguished based on whether the dry-pressed ceramic plate can be successfully demolded. Their specific draft angles and draft depths are determined by those skilled in the art based on actual values. Therefore, when forming metal parts of other sizes, the draft angles of the dry-pressed ceramic plate are distinguished based on whether the dry-pressed ceramic plate can be successfully demolded. Thus, the draft angle can be set as a rounded corner structure or a chamfered structure as described below, as needed. Therefore, this draft angle structure can serve as a standard structure for sintering molds and is used for the subsequent design and molding of various types of dry-pressed ceramic plates.

[0026] Since dry-pressed ceramic products cannot be reliably demolded at the first draft angle 111, the area where the first draft angle 111 intersects with any other draft angle is set as a rounded corner structure R. This allows the included angle between the first draft angle 111 and other draft angles 11 to be larger, i.e., the transition is smoother. This reduces the bonding area between the dry-pressing mold and the ceramic plate at the draft angle, thereby reducing the bonding force and lowering the demolding difficulty of the dry-pressed ceramic plate. It can directly form ceramic plates with small draft angles (e.g., draft angle of 15°) without further machining of the dry-pressed ceramic plate, reducing costs and improving efficiency. This solves the problem that existing dry-pressed ceramic plates cannot be directly formed with small draft angles. It can also serve as a standard mold structure for the subsequent design of various dry-pressed ceramic plates with the first draft angle 111.

[0027] In the above embodiments, each sidewall of the first molding recess 1 is a first draft slope 111, and thus the draft angle 100 of each first molding recess 1 refers to the angle between any first draft slope 111 and other first draft slopes 111, but is not limited thereto. In other embodiments, the sidewall of the first molding recess 1 can also be a combination of a first draft slope 111 and a second draft slope 112, that is, at least one first draft slope 111 and at least one second draft slope 112 are spliced ​​to form the first molding recess 1. In this case, the draft angle 100 of each first molding recess 1 refers to the angle between any first draft slope 111 and other first draft slopes 111 or second draft slopes 112.

[0028] The draft angle 100 mentioned above is a rounded corner structure. In other embodiments, the draft angle 100 can also be a chamfered structure, and the specific value of the chamfer is determined according to the size of the draft slope.

[0029] In this embodiment, the first forming recess 1 is a groove with three draft slopes 11. The three side walls are connected in sequence to form two draft angles 100. In other embodiments, the first forming recess 1 can also be other structures, such as a triangular groove formed by the three side walls, or a polygonal groove formed by more than three side walls.

[0030] In addition to the aforementioned draft angle 100 being a rounded or chamfered structure, this invention also sets the connection between the parting surface 12 and the second draft slope 112 between adjacent first molding recesses 1 as a chamfered or rounded structure R. Although the draft angle of the second draft slope 112 between adjacent first molding recesses 1 is relatively large, the included angle between the parting surface 12 and the second draft slope 112 will still affect demolding to some extent. This invention sets the connection as a chamfered or rounded structure, reducing the risk of poor demolding at this point.

[0031] See Figure 3 As can be seen, the dry-pressed ceramic plate in this embodiment also has multiple draft slopes, but these draft slopes are all second draft slopes 112 and do not intersect with the first draft slope 111. Therefore, the connection between them and each parting surface is a sharp corner structure (i.e., no chamfer or rounded corner structure is provided), but it is not limited to a sharp corner structure. It can also be set as a chamfer or rounded corner, that is, no specific limitation is made here.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A dry-pressed ceramic plate for metal powder molding, characterized in that: The material has a first forming concave and convex portion, the first forming concave and convex portion having a plurality of draft slopes, wherein at least one of the draft slopes of the first forming concave and convex portion is a first draft slope, and the angle between the first draft slope and other draft slopes is defined as a draft angle, the draft angle being a chamfered structure or a rounded corner structure.

2. The dry-pressed ceramic plate for metal powder molding according to claim 1, characterized in that: The first molding protrusion has multiple portions, and the draft angle of each first molding protrusion is the first draft angle, so that the draft angle of each first molding protrusion refers to the angle between any first draft angle and other first draft angles.

3. A dry-pressed ceramic plate for metal powder molding according to claim 2, characterized in that: Each of the first forming protrusions and recesses has three of the first draft slopes.

4. A dry-pressed ceramic plate for metal powder molding according to claim 1, characterized in that: The first forming concave-convex part is a groove with three draft slopes, and the three sidewalls are connected in sequence to form two draft angles.

5. A dry-pressed ceramic plate for metal powder molding according to claim 1, characterized in that: The first molding protrusion has multiple portions, and a second draft angle is provided between adjacent first molding protrusions. The included angle between the first draft angle and the second draft angle is the draft angle.

6. A dry-pressed ceramic plate for metal powder molding according to claim 5, characterized in that: The first draft slope is a draft slope that poses a risk of damaging the ceramic product after dry pressing of the ceramic plate. The second draft slope is a draft slope other than the first draft slope. The draft angle of the first draft slope is smaller than the draft angle of the second draft slope.

7. A dry-pressed ceramic plate for metal powder molding according to claim 6, characterized in that: The draft angle of the first draft slope is less than 30°, and the draft angle of the second draft slope is greater than or equal to 30°.

8. A dry-pressed ceramic plate for metal powder molding according to claim 5, characterized in that: A parting surface is provided between adjacent first molding protrusions and recesses, and the connection between the parting surface and the second draft angle is a chamfered structure or a rounded corner structure.

9. A dry-pressed ceramic plate for metal powder molding according to claim 1, characterized in that: The draft angle of the first draft slope is less than 30°, and the depth of the first draft slope is greater than or equal to 1.4 mm.

10. A dry-pressed ceramic plate for metal powder molding according to claim 9, characterized in that: The draft angle of the first draft slope is 15°, and the depth of the first draft slope is 1.4 mm.

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