Dewaxing die for hot die casting small-hole ceramic structural part

Abstract

The utility model belongs to the technical field of structural ceramic preparation, and particularly relates to a hot-die-casting small-hole ceramic structural part dewaxing die which comprises a base, a contact pin and a fixing bracket, the upper end face of the base is attached to the bottom face of small-hole ceramic and matched with the bottom of the small-hole ceramic, and a concave inserting groove is formed in the lower end face of the base; the contact pin is arranged on the base and used for penetrating through a ceramic hole in the small-hole ceramic, and a contact pin body is arranged in the small-hole ceramic hole; the fixed bracket comprises a first mounting seat and a second mounting seat, a plurality of convex mounting tables A are arranged on the first mounting seat, and a plurality of mounting columns are arranged on the upper end surface of each convex mounting table A; a plurality of mounting tables B are arranged on the second mounting seat; the convex mounting table A of the first mounting seat is inserted into a long through hole formed between two adjacent mounting tables B on the second mounting seat, so that insertion and fixation are realized; and the base is fixed on the mounting column through the bottom concave slot. According to the scheme, the small-hole ceramic green body does not deform, the cleanness in the small hole is ensured, and the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of structural ceramic preparation, in particular to a wax removal mould for a hot die casting small-hole ceramic structural part. Background Art

[0002] Hot die casting is a widely used production process for complex structural ceramics. Its basic principle is to use the characteristics of paraffin wax melting when heated and solidifying when cold to evenly mix non-plastic ceramic powder with hot paraffin wax (10∽25wt%) liquid to form a flowable slurry, which is then injected into a metal mold under a certain pressure to form a mold. After the wax slurry is cooled and solidified, the molded body is removed from the mold. The products formed by this method are more accurate in size, have a higher degree of finish, and have a compact structure. They are now widely used in the manufacture of structural ceramic products, and small pore structures are more common in structural ceramics.

[0003] Before sintering, a wax removal process is required to remove the paraffin wax. Usually, the hot die casting green body is placed in an adsorbent for burning and wax removal. This method can not only completely remove the paraffin wax, but also ensure that the green body does not produce defects such as deformation, cracking, bending, and shrinkage of holes. However, this method still has defects. After burning and wax removal, the structural parts will inevitably be stained with the adsorbent, especially the adsorbent in the small pore structure is extremely difficult to completely remove, which affects the quality of the sintered product after high-temperature sintering. Utility Model Content

[0004] In order to solve the above technical problems, a wax removal mold for hot die casting small-pore ceramic structural parts is used in conjunction with small-pore ceramics. The small-pore ceramics include a columnar body, one or more ceramic holes are arranged on the columnar body, including a base, a pin and a fixed bracket.

[0005] A base having an upper end surface, the upper end surface of the base being attached to the bottom surface of the small-pore ceramic and matching the bottom of the small-pore ceramic, and the lower end surface being provided with a recessed slot;

[0006] The pin is arranged on the base and is used to penetrate the ceramic hole on the small-hole ceramic. The pin body is placed in the small-hole ceramic hole.

[0007] The fixed bracket includes a first mounting seat and a second mounting seat, wherein the first mounting seat is provided with a plurality of raised mounting platforms A, and each raised mounting platform A is provided with a plurality of mounting columns on its upper end surface; the second mounting seat is provided with a plurality of mounting platforms B; the raised mounting platform A of the first mounting seat is inserted into a long through hole formed between two adjacent mounting platforms B on the second mounting seat to achieve plug-in fixation;

[0008] The base is secured to the mounting post via recessed slots on the bottom.

[0009] Furthermore, the number and positions of the pins correspond to the ceramic holes.

[0010] Furthermore, the head end of the pin passes through the ceramic hole for a distance.

[0011] Furthermore, the mold material is a high temperature resistant porous material such as porous ceramic fiber or porous activated carbon.

[0012] Furthermore, the diameter of the pin is 0.05-0.1 mm smaller than the diameter of the ceramic hole.

[0013] Furthermore, the material of the fixed bracket includes but is not limited to ceramic, stainless steel, and graphite.

[0014] Furthermore, a protective cap is arranged at the head end of each pin, a blind hole is arranged on the protective cap, and a distance is provided between the top end of the pin and the top of the blind hole.

[0015] When a variety of adsorbent powders are used to bury and burn small-pore ceramic products, the mold of the utility model is inserted into the small-pore ceramic. This method can not only ensure that the small-pore ceramic green body will not produce defects such as deformation, cracking, bending, and shrinkage of the hole, but also ensure that the small hole is clean, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the utility model according to the small-pore ceramic structure;

[0018] Figure 3 This is a schematic diagram of the structure of an embodiment of the base and the plug pin of the utility model;

[0019] Figure 4 yes Figure 3 Cross-sectional view after assembly with small-pore ceramic products;

[0020] Figure 5 It is a schematic structural diagram of another embodiment of the base and the plug pin of the utility model;

[0021] Figure 6 yes Figure 5 Schematic diagram of the assembly of ceramic products with small holes.

[0022] Among them, 1. base; 2. pin; 3. fixed bracket; 301. first mounting seat; 302. second mounting seat; 303. mounting platform A; 304. mounting platform B; 305. mounting column; 4. protective cap; 5. small-hole ceramic product. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] refer to Figure 1-6 The utility model provides a wax removal mold for hot die casting small-hole ceramic structural parts, which is used on small-hole ceramic products 5 and includes a base 1, a pin 2 and a fixed bracket 3.

[0025] A base having an upper end surface, the upper end surface being matched with the bottom of the small-pore ceramic 5, and the upper end surface of the base being attached to the bottom surface of the small-pore ceramic;

[0026] The fixing bracket 3 includes a first mounting seat 301 and a second mounting seat 302, wherein the first mounting seat 301 is provided with a plurality of raised mounting platforms A303, and the upper end surface of each raised mounting platform A303 is provided with a plurality of mounting columns 305; the second mounting seat 302 is provided with a plurality of mounting platforms B304; the raised mounting platform A303 of the first mounting seat 301 is inserted into a long through hole formed between two adjacent mounting platforms B304 on the second mounting seat 302 to achieve plug-in fixation;

[0027] The base is fixed to the mounting post 305 via a bottom recessed slot.

[0028] The pin is arranged on the base and is used to penetrate the ceramic hole on the small-hole ceramic and is entirely located in the ceramic hole.

[0029] According to the product structure of small-pore ceramics, mold design is carried out. Figure 3 The schematic diagram of the structure of the base and the pin of the wax removal mold is an embodiment, wherein the base is set to a step structure, wherein the diameter ф1 = 3.05mm, the step hole diameter ф2 = 1.60mm; the pin is set to 1, and the pin ф3 = 0.55mm. The first mounting seat 301 and the second mounting seat 302 of the fixed bracket 3 are independently assembled with small-hole ceramic products. That is, the small-hole ceramic products on the mounting table A are assembled first, and then the small-hole ceramic products on the mounting table B are assembled, and then the two mounting seats are assembled together. This method can not only reduce the difficulty of assembly (increase the distance between parts during assembly) and improve assembly efficiency, but also increase the number of products per unit volume during wax removal and improve production efficiency. That is, the mounting columns 305 on the first mounting seat 301 are all installed with small-hole ceramic products through the base and the pin, and the second mounting seat 302 is also assembled in the same way, and then the two mounting seats are embedded and assembled and fixed, and then placed on the bottom of the crucible covered with adsorbent, and the adsorbent is a yttrium oxide adsorbent with a particle size of submicron. Then continue to fill the crucible with yttrium oxide adsorbent to completely cover the product of the mold assembly to form the small-pore ceramic. Then run the wax removal program. After the program is completed, wait for the furnace temperature to naturally drop below 100°C, and then take out the product. Demolding, ultrasonically clean the mold, and recover the yttrium oxide adsorbent.

[0030] refer to Figure 5, another embodiment structure of the base and the plug pin of the utility model is provided. In this embodiment, four plug pins are arranged on the base, and the diameter ф1=2.95mm;

[0031] The bottom of the crucible is covered with an alumina adsorbent having a particle size of about 5-10 mm and a submicron size;

[0032] Insert the assembled fixed bracket 3 into the bottom adsorbent, and continue to fill the alumina adsorbent into the crucible to completely cover the product of the assembled mold to form the small-pore ceramic. Then run the wax removal program. After the program is completed, wait for the furnace temperature to naturally drop below 100°C, and then take out the product. Demolding, ultrasonically clean the mold, and recover the alumina adsorbent.

[0033] As an improvement of the solution, one or more pins are provided, and the pins are adapted to the positions, sizes and shapes of the holes on the small-porous ceramic 3 .

[0034] As an improvement to the solution, the head end of the pin passes through the ceramic hole for a distance.

[0035] As an improvement of the solution, the mold material includes porous ceramic fibers or porous activated carbon.

[0036] As an improvement to the solution, the diameter of the ceramic hole of the mold pin is 0.05-0.1mm smaller than that of the small-hole ceramic product. The product needs to fit tightly with the mold during the wax removal process, and the size may shrink slightly, so shrinkage space needs to be reserved. Similarly, the mold size cannot be too large or too small.

[0037] As an improvement of the solution, the material of the fixed bracket 3 includes but is not limited to ceramic, stainless steel, and graphite.

[0038] As an improvement of the solution, a protective cap 4 is provided at the head end of each pin, and a blind hole is provided on the protective cap 4. There is a distance between the top of the pin and the top of the blind hole, which is suitable for assembling pins of different sizes.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wax removal mold for hot die casting small-pore ceramic structural parts, used in conjunction with small-pore ceramics, wherein the small-pore ceramics include a columnar body, and one or more ceramic holes are provided on the columnar body, characterized in that: Including base, pins and fixed bracket, A base having an upper end surface and a lower end surface, wherein the upper end surface of the base is attached to the bottom surface of the small-pore ceramic and matches the bottom of the small-pore ceramic, and the lower end surface is provided with a recessed slot; The pin is arranged on the base and is used to penetrate the ceramic hole on the small-hole ceramic, and the pin body is placed in the small-hole ceramic hole; The fixed bracket includes a first mounting seat and a second mounting seat, wherein the first mounting seat is provided with a plurality of raised mounting platforms A, and each raised mounting platform A is provided with a plurality of mounting columns on its upper end surface; the second mounting seat is provided with a plurality of mounting platforms B; the raised mounting platform A of the first mounting seat is inserted into a long through hole formed between two adjacent mounting platforms B on the second mounting seat to achieve plug-in fixation; The base is secured to the mounting post via recessed slots on the bottom.

2. A wax removal mold for hot die casting small-pore ceramic structural parts as claimed in claim 1, characterized in that: The number and positions of the pins correspond to the ceramic holes.

3. A wax removal mold for hot die casting small-pore ceramic structural parts as claimed in claim 1, characterized in that: The head end of the pin passes through the ceramic hole for a distance.

4. A wax removal mold for hot die casting small-pore ceramic structural parts as claimed in claim 1, characterized in that: The mold material is porous ceramic fiber or porous activated carbon high temperature resistant porous material.

5. A wax removal mold for hot die casting small-pore ceramic structural parts as claimed in claim 1, characterized in that: The diameter of the pin is 0.05-0.1 mm smaller than the diameter of the ceramic hole.

6. A wax removal mold for hot die casting small-pore ceramic structural parts as claimed in claim 1, characterized in that: A protective cap is arranged at the head end of each plug pin, a blind plug hole is arranged on the protective cap, and a distance is provided between the top end of the plug pin and the top inside the blind plug hole.

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