Machining mold and machining method of ceramic insulator

Abstract

The invention discloses a machining mold and method for a ceramic insulator. The machining mold comprises a working panel, an upper pressing piece, a lower pressing piece and a middle rod, and the working panel is provided with a through hole type female mold; the upper pressing piece is provided with a first concave part, a first through hole is formed in the bottom of the first concave part, the bottom edge of the first concave part is a first bottom arc surface, and the top edge of the first concave part is a first top arc surface; the lower pressing piece is provided with a second concave part, a second through hole is formed in the bottom of the second concave part, the bottom edge of the second concave part is a second bottom cambered surface, and the top edge of the second concave part is a second top cambered surface; the upper pressing piece and the lower pressing piece form an insulator forming cavity in the through hole type female mold, and the middle rod penetrates from the first through hole to the second through hole through the insulator forming cavity. High-temperature calcination and other processes are not needed, the process is simple, meanwhile, the phenomenon of small local density caused by poor powder fluidity in the pressing process can be avoided, and the problems that the densities of the two ends of the ceramic insulator are inconsistent and the waist is loose are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of insulators, and in particular to a processing mold and a processing method for a ceramic insulator. Background Art

[0002] Insulators are devices installed between conductors of different potentials or between conductors and grounded components, which can withstand voltage and mechanical stress and play an important role in overhead transmission lines. At present, insulator processing mainly adopts extrusion molding process, which is to calcine insulating materials such as ceramics into liquid or semi-liquid state at high temperature and then extrude them into shape. However, this process is complicated to operate and requires high-temperature calcination and other processes, which has high production costs. Summary of the invention

[0003] The invention provides a processing mould and a processing method for a ceramic insulator, so as to solve the technical problem that the current processing technology of the insulator is complicated.

[0004] In order to solve the above technical problems, in a first aspect, the present invention provides a processing mold for a ceramic insulator, comprising a working panel, an upper pressing piece, a lower pressing piece and a middle rod, wherein the working panel is provided with a through-hole female mold adapted to the upper pressing piece and the lower pressing piece; A first recessed portion is provided on one end surface of the upper pressing member, a first through hole adapted to the middle rod is provided at the bottom of the first recessed portion, a bottom edge of the first recessed portion is a first bottom arc surface, and a top edge of the first recessed portion is a first top arc surface; a second recessed portion is provided on one end surface of the lower pressing member, a second through hole adapted to the middle rod is provided at the bottom of the second recessed portion, a bottom edge of the second recessed portion is a second bottom arc surface, and a top edge of the second recessed portion is a second top arc surface; The upper pressing piece and the lower pressing piece are respectively embedded from both ends of the through-hole type female mold to form an insulator molding cavity, and the middle rod passes through the insulator molding cavity from the first through-hole to the second through-hole.

[0005] In some embodiments, the arc length of the first bottom arc surface is smaller than the arc length of the first top arc surface, and the arc length of the second bottom arc surface is smaller than the arc length of the second top arc surface.

[0006] In some embodiments, both the first top curved surface and the second top curved surface are multi-layer curved surfaces with a step-like transition.

[0007] In some of the embodiments, the arc lengths of the multi-layer arc surfaces increase from inside to outside.

[0008] In some embodiments, the other end of the upper pressing member is a first boss extending outward, and the diameter of the first boss is larger than the diameter of one end of the upper pressing member; the other end of the lower pressing member is a second boss extending outward, and the diameter of the second boss is larger than the diameter of one end of the lower pressing member.

[0009] In some of the embodiments, the through-hole master mold is made of alloy material.

[0010] In some of the embodiments, a side of the working panel close to the through-hole female mold is provided with an inclined surface.

[0011] In a second aspect, the present invention further provides a method for processing a ceramic insulator, which is applied to a processing mold for the ceramic insulator as described above, and the processing method comprises: The working panel is moved upward by a preset distance until one end of the upper pressing piece is partially embedded in the through-hole type mother mold of the working panel, and then the through-hole type mother mold is filled with ceramic powder, wherein under normal conditions, one end of the upper pressing piece after the middle rod is inserted is completely embedded in the through-hole type mother mold; The lower pressing piece is embedded in the through-hole type female mold, and the middle rod is inserted into the lower pressing piece, and then pressure is applied to the upper pressing piece and the lower pressing piece to press the ceramic powder into a ceramic insulator; The lower pressing piece is moved out of the through-hole type female mold, and then the working panel is moved downward, so that the upper pressing piece moves upward relative to the working panel to push the ceramic insulator out of the through-hole type female mold, thereby obtaining a ceramic insulator.

[0012] In some embodiments, the step of filling the through-hole master mold with ceramic powder comprises: The ceramic powder of a preset mass is poured into the through-hole type mold, and the powder is compacted by using an auxiliary rod while pouring, so that the ceramic powder is evenly filled in the through-hole type mold.

[0013] In some embodiments, applying pressure to the upper pressing member and the lower pressing member includes: A pressure forming machine is used to apply pressure to the upper pressing piece and the lower pressing piece for multiple times according to a preset program, and the pressure applied each time gradually increases.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention realizes pressing molding through a ceramic insulator processing mold, does not require processes such as high-temperature calcination, and reduces the complexity of the process. At the same time, the processing mold adopts a curved surface as a transition surface, which is conducive to improving the fluidity of the ceramic powder in the insulator molding chamber, so as to avoid the uneven distribution of the ceramic powder due to poor powder fluidity during the pressing process, resulting in a local low density phenomenon in the ceramic insulator, and effectively solves the problems of inconsistent density at both ends of the ceramic insulator and loose waist. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a processing mold for a ceramic insulator according to an embodiment of the present invention; Figure 2 A schematic cross-sectional view of a processing mold for a ceramic insulator according to an embodiment of the present invention; Figure 3 The embodiment of the present invention is shown Figure 2 Schematic diagram of a local perspective; Figure 4 It is a schematic diagram of an exploded perspective of a processing mold for a ceramic insulator shown in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of an upper pressing member according to an embodiment of the present invention; Figure 6 The embodiment of the present invention is shown Figure 5 Schematic diagram of a local perspective; Figure 7 A schematic diagram of the structure of a lower pressing member according to an embodiment of the present invention; Figure 8 The embodiment of the present invention is shown Figure 7 Schematic diagram of a local perspective; Fig. 9 A schematic diagram of the structure of a ceramic insulator according to an embodiment of the present invention; Fig.10 A schematic diagram of the planar structure of a ceramic insulator processed by the related technology shown in an embodiment of the present invention; Fig.11 The present invention is a flow chart of a method for processing a ceramic insulator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] As described in the background technology, the current ceramic insulator processing mainly adopts the extrusion molding process. However, due to the complexity of the extrusion molding process, some technologies consider using the pressing molding process to process ceramic insulators. However, the ceramic insulators obtained by pressing molding are Fig.10 As shown, there are inconsistent densities at the two ends of the head and waist (such as Fig.10 To solve the problem of loose quality (shown as "B" in the figure). To this end, the present application provides a processing mold for a ceramic insulator, and a ceramic insulator processing method using the processing mold, so as to improve the processing quality of the ceramic insulator and simplify the processing process.

[0020] See also Figures 1 to 8 , Figure 1 The present invention provides a processing mold for a ceramic insulator, comprising a working panel 1, an upper pressing piece 2, a lower pressing piece 3 and a middle rod 4, wherein the working panel 1 is provided with a through-hole female mold 11 adapted to the upper pressing piece 2 and the lower pressing piece 3; A first recessed portion 21 is provided at one end surface of the upper pressing member 2, a first through hole 211 adapted to the middle rod 4 is provided at the bottom of the first recessed portion 21, a bottom edge of the first recessed portion 21 is a first bottom arc surface 212, and a top edge of the first recessed portion 21 is a first top arc surface 213; a second recessed portion 31 is provided at one end surface of the lower pressing member 3, a second through hole 311 adapted to the middle rod 4 is provided at the bottom of the second recessed portion 31, a second bottom arc surface 312 is provided at the bottom of the second recessed portion 31, and a second top arc surface 313 is provided at the top edge of the second recessed portion 31; The upper pressing piece 2 and the lower pressing piece 3 are respectively embedded from both ends of the through-hole type female mold 11 to form an insulator molding cavity 5 , and the middle rod 4 passes through the first through-hole 211 through the insulator molding cavity 5 to the second through-hole 311 .

[0021] In this embodiment, the first top arc surface of the upper pressing piece and the second top arc surface of the lower pressing piece are both specifically inclined surfaces with arcs, so that the flowability of the ceramic powder in the insulator molding chamber is better, which effectively solves the problem of the waist of the insulator (such as Fig. 9 The problem of looseness due to insufficient powder filling (shown as "A"), while the fluidity of the ceramic powder in the insulator is enhanced, the distribution of the ceramic powder in the insulator molding chamber is more uniform, and the phenomenon of large density differences at both ends of the ceramic insulator is effectively avoided. The processing mold of this embodiment only needs to cooperate with the pressure molding machine for pressing and molding, and does not require a high-temperature calcination process, which greatly reduces the complexity of the process.

[0022] In some embodiments, Figure 6 and Figure 8 As shown, the arc length of the first bottom arc surface 212 is smaller than the arc length of the first top arc surface 213, and the arc length of the second bottom arc surface 312 is smaller than the arc length of the second top arc surface 313. Since the bottom arc surface is affected by gravity, the ceramic powder can easily fill the entire bottom, and the top arc surface corresponds to the waist of the ceramic insulator. In order to prevent the waist of the ceramic insulator from being loose, the top arc surface is set as an inclined surface with a longer arc length, so as to increase the flow range of the ceramic powder, thereby improving the dispersion uniformity of the ceramic powder.

[0023] In some embodiments, Figure 6 and Figure 8 As shown, the first top curved surface 212 and the second top curved surface 312 are both multi-layer curved surfaces with step-like transitions. The multi-layer curved surface has a step-like transition to ensure that the waist of the ceramic insulator is filled with enough ceramic powder. Compared with a single continuous curved surface, it can further effectively prevent the ceramic powder from continuously sliding down due to gravity, resulting in insufficient ceramic powder filling at the waist.

[0024] In some embodiments, Figure 6 and Figure 8 As shown, the arc lengths of the multi-layer arc surfaces increase from the inside to the outside, so that the flow of the ceramic powder is smoother.

[0025] In some embodiments, Figure 5 and Figure 7 As shown, the other end of the upper pressing piece 2 is a first boss 22 extending outwards, and the diameter of the first boss 22 is larger than the diameter of one end of the upper pressing piece 2; the other end of the lower pressing piece 3 is a second boss 32 extending outwards, and the diameter of the second boss 32 is larger than the diameter of one end of the lower pressing piece 3. Providing bosses on the upper pressing piece and the lower pressing piece can play a role in limiting and positioning, avoiding the different embedding depths of the upper pressing piece and the lower pressing piece in the through-hole female mold, which affects the force on the two ends of the ceramic insulator during pressure-holding molding; at the same time, the boss structure facilitates the operation of the upper pressing piece and the lower pressing piece.

[0026] In some embodiments, the through-hole female mold 11 is made of alloy material, and the upper pressing piece and the lower pressing piece may also be made of alloy material, so that the mold has sufficient rigidity to avoid deformation during the pressure-holding molding of the ceramic insulator.

[0027] In some embodiments, Figure 1 As shown, a slope is provided on one side of the working panel 1 close to the through-hole female mold 11 so that the ceramic insulator can be quickly stored along the slope after processing.

[0028] See also Fig.11 , Fig.11 The present invention is a flowchart of a method for processing a ceramic insulator according to an embodiment of the present invention. The method is applied to a processing mold of the ceramic insulator as described above. The method includes steps 101 to S013, which are described in detail as follows: Step 101, move the working panel 1 upward by a preset distance until one end of the upper pressing piece 2 is partially embedded in the through-hole type mother mold 11 of the working panel 1, and then fill the through-hole type mother mold 11 with ceramic powder, wherein under normal conditions, one end of the upper pressing piece 2 is completely embedded in the through-hole type mother mold 11 after the middle rod 4 is inserted.

[0029] In this step, the middle rod is inserted into the first through hole of the upper pressing piece, and then the upper pressing piece is completely embedded into the through hole type mother mold from one side of the working panel, wherein the first boss of the upper pressing piece plays a limiting role in the embedding of the upper pressing piece into the through hole type mother mold. During processing, the working panel is moved upward for a distance, at which time the upper pressing piece is still partially in the through hole type mother mold, so that the through hole type mother mold is filled with ceramic powder and the lower pressing piece is embedded in the through hole type mother mold. Leave space.

[0030] Optionally, the upper pressing piece can be fixed on the worktable surface of the pressure molding machine to keep the position of the upper pressing piece relative to the pressure molding machine unchanged, and the volume of the insulator molding chamber can be controlled by simply adjusting the working panel and the lower pressing piece.

[0031] In some embodiments, the step of filling the through-hole master mold 11 with ceramic powder includes: A preset mass of the ceramic powder is poured into the through-hole type master mold 11 , and the powder is compacted by using an auxiliary rod while being poured, so that the ceramic powder is evenly filled in the through-hole type master mold 11 .

[0032] In this embodiment, the amount of ceramic powder is determined according to the specifications of the ceramic insulator to be processed. Since there are many gaps when the ceramic powder is initially poured into the through-hole type mother mold, an auxiliary rod is used to poke the powder to reduce the gaps and improve the uniformity of powder dispersion. Optionally, when pouring the ceramic powder, an auxiliary conical ring can be used to be placed in the orifice of the through-hole type mother mold to prevent the ceramic powder from spilling out, which is more convenient for operation.

[0033] Step S102, embedding the lower pressing piece 3 into the through-hole female mold 11, inserting the middle rod 4 into the lower pressing piece 3, and then applying pressure to the upper pressing piece 2 and the lower pressing piece 3 to press the ceramic powder into a ceramic insulator.

[0034] In this step, after the operation of step S101, the lower pressing piece is embedded into the through-hole type mother mold from the other side of the working panel, and the middle rod is inserted into the lower pressing piece. Before the lower pressing piece is embedded into the through-hole type mother mold, the height of the middle rod in the through-hole type mother mold is higher than the filling height of the ceramic powder to prevent the ceramic powder from entering the second through hole of the lower pressing piece and causing insufficient ceramic powder. Optionally, the pressure applied by the upper pressing piece and the lower pressing piece is completed by a pressure forming machine.

[0035] In some embodiments, applying pressure to the upper pressing member 2 and the lower pressing member 3 includes: A pressure forming machine is used to apply pressure to the upper pressing member 2 and the lower pressing member 3 for multiple times according to a preset program, and the pressure and the duration of the pressure applied each time gradually increase.

[0036] In this embodiment, the specific pressure and specific duration of the pressure application actually applied by the pressure forming machine are related to the processing specifications of the ceramic insulator and are not limited thereto. This embodiment uses multiple pressurization methods to perform pressurization so that the ceramic powder can gradually flow evenly at a relatively low pressure in the early stage, ensuring that the density difference between the various parts of the ceramic insulator is small, and avoiding the phenomenon that a single high pressure causes local ceramic powder to be compacted, resulting in a decrease in the fluidity of the ceramic powder at the location of the second top arc surface.

[0037] Step S103, moving the lower pressing member 3 out of the through-hole female mold 11, and then moving the working panel 1 downward, so that the upper pressing member 2 moves upward relative to the working panel 1 to push the ceramic insulator out of the through-hole female mold 11, thereby obtaining a ceramic insulator.

[0038] In this step, after the lower pressing piece moves out of the through-hole female mold and the working panel moves downward, the ceramic insulator is pushed out and then rolls down the inclined surface to the product storage part, completing the processing of the ceramic insulator. It should be noted that the ceramic insulator may also undergo surface grinding, glazing and other processes, which are not limited thereto.

[0039] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A processing mold for a ceramic insulator, characterized in that: It includes a working panel, an upper pressing piece, a lower pressing piece and a middle rod, wherein the working panel is provided with a through-hole female mold adapted to the upper pressing piece and the lower pressing piece; A first recessed portion is provided on one end surface of the upper pressing member, a first through hole adapted to the middle rod is provided at the bottom of the first recessed portion, a bottom edge of the first recessed portion is a first bottom arc surface, and a top edge of the first recessed portion is a first top arc surface; a second recessed portion is provided on one end surface of the lower pressing member, a second through hole adapted to the middle rod is provided at the bottom of the second recessed portion, a bottom edge of the second recessed portion is a second bottom arc surface, and a top edge of the second recessed portion is a second top arc surface; The upper pressing piece and the lower pressing piece are respectively embedded from both ends of the through-hole type female mold to form an insulator molding cavity, and the middle rod passes through the insulator molding cavity from the first through-hole to the second through-hole.

2. The processing mold for ceramic insulators according to claim 1, characterized in that: The arc length of the first bottom arc surface is smaller than the arc length of the first top arc surface, and the arc length of the second bottom arc surface is smaller than the arc length of the second top arc surface.

3. The processing mold for ceramic insulators according to claim 1, characterized in that: The first top curved surface and the second top curved surface are both multi-layer curved surfaces with step-type transitions.

4. The processing mold for ceramic insulators according to claim 3, characterized in that: The arc lengths of the multi-layer arc surfaces increase from inside to outside.

5. The processing mold for ceramic insulators according to claim 1, characterized in that: The other end of the upper pressing piece is a first boss extending outward, and the diameter of the first boss is larger than the diameter of one end of the upper pressing piece; the other end of the lower pressing piece is a second boss extending outward, and the diameter of the second boss is larger than the diameter of one end of the lower pressing piece.

6. The processing mold for ceramic insulators according to claim 1, characterized in that: The through-hole type master mold is made of alloy material.

7. The processing mold for ceramic insulators according to claim 1, characterized in that: A side of the working panel close to the through-hole type female mold is provided with an inclined surface.

8. A method for processing a ceramic insulator, characterized in that: The processing mold applied to the ceramic insulator according to any one of claims 1 to 6, wherein the processing method comprises: The working panel is moved upward by a preset distance until one end of the upper pressing piece is partially embedded in the through-hole type mother mold of the working panel, and then the through-hole type mother mold is filled with ceramic powder, wherein under normal conditions, one end of the upper pressing piece after the middle rod is inserted is completely embedded in the through-hole type mother mold; The lower pressing piece is embedded in the through-hole type female mold, and the middle rod is inserted into the lower pressing piece, and then pressure is applied to the upper pressing piece and the lower pressing piece to press the ceramic powder into a ceramic insulator; The lower pressing piece is moved out of the through-hole type female mold, and then the working panel is moved downward, so that the upper pressing piece moves upward relative to the working panel to push the ceramic insulator out of the through-hole type female mold, thereby obtaining a ceramic insulator.

9. The method for processing a ceramic insulator according to claim 8, characterized in that: The step of filling the through-hole type master mold with ceramic powder comprises: The ceramic powder of a preset mass is poured into the through-hole type mold, and the powder is compacted by using an auxiliary rod while pouring, so that the ceramic powder is evenly filled in the through-hole type mold.

10. The method for processing a ceramic insulator according to claim 8, characterized in that: The step of applying pressure to the upper pressing member and the lower pressing member comprises: A pressure forming machine is used to apply pressure to the upper pressing piece and the lower pressing piece for multiple times according to a preset program, and the pressure applied each time gradually increases.

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