CN115770807A - A multi-angular door frame forming mold and its processing method - Google Patents

Abstract

The invention discloses a multi-edge door frame forming die and a processing method thereof, and the forming die comprises a lower die holder and an upper die body, wherein a first air cylinder and a second air cylinder are arranged at two ends of the lower die holder, a connector is arranged at the output end of the first air cylinder, a middle die body is arranged at the top of the connector through a bolt, a primary forming area matched with the forming area of the upper die body is distributed at the top of the middle die body, a lower die body positioned at the lower part of the connector is arranged on the lower die holder, the output end of the second air cylinder is connected with the bottom of the lower die body, an area between the lower die body and the lower die holder is a secondary forming area, ti-xY wear-resistant alloy layers are arranged on the surfaces of the middle die body, the lower die body and the upper die body, the final forming of a reverse structure is completed by utilizing the primary forming of the reverse structure matched with the primary forming area and the micro-short retraction of an air cylinder piston rod, only one set of modules and two steps are needed, the efficiency is greatly improved, the precision can also be ensured, the wear-resistant alloy layers can be favorably reduced, the wear rate is reduced, and the service life is prolonged.

Description

A multi-angular door frame forming mold and its processing method

technical field

The invention relates to the technical field of door frame bending and forming, in particular to a multi-angular door frame forming mold and a processing method thereof.

Background technique

The bending machine mold is divided into the upper mold, the lower mold and the mold base of the bending machine. It is a mold used for sheet metal bending forming and separation. As shown in Figure 6, the door frame structure in the figure has seven bending structures, especially the key structure at A in the door frame structure. Positioning is performed four times. Due to errors in each positioning, the bending accuracy of this key structure is greatly reduced, and the production efficiency also needs to be further optimized.

And because the key structure has a folded structure, when the folded structure is initially bent, it will inevitably cause the wear of the bending die. If the traditional 42CrMo material is used as the raw material of the die, its wear resistance cannot meet the existing working conditions. For example, Therefore, it is necessary to further improve the wear resistance of the bending die.

Contents of the invention

The purpose of the present invention is to solve the deficiencies in the prior art, so a multi-angular door frame forming mold and its processing method are proposed. The initial forming of the equipped folding structure and the micro-short-distance retraction of the cylinder piston rod complete the final forming of the folding structure. Only one set of modules is required to complete the two-step process. The efficiency is also greatly improved and the accuracy can be guaranteed. Using The alloy layer can be beneficial to reduce the degree of wear resistance, reduce the wear rate, and improve the service life.

In order to achieve the above object, the present invention adopts the following technical solutions:

A multi-angular door frame forming mold, including a lower mold base and an upper mold body, the lower mold base is equipped with a cylinder one located at both ends and a cylinder two located in the middle, and a connector is installed on the output end of the cylinder one, and the top of the connector passes through Bolts are installed with a middle mold body, and the top of the middle mold body is provided with a preliminary forming area that matches the molding area of the upper mold body. The bottom of the mold body is connected, the area between the lower mold body and the lower mold base is the secondary forming area, and the surfaces of the middle mold body, the lower mold body and the upper mold body are all provided with Ti-xY wear-resistant alloy layers.

On the basis of the above-mentioned embodiment, the following improvement is made, the lower mold body includes a connection part connected to the second output end of the cylinder and relatively sliding with the lower mold base, and a secondary forming pressure head integrally connected with the connecting part, the secondary forming pressure The bottom surface of the head and the top surface of the lower mold seat are surrounded by a secondary forming area, and the top surface of the secondary forming pressure applying head and the bottom surface of the connecting head located directly above the secondary forming pressure applying head are formed into a positioning area.

On the basis of the above-mentioned embodiment, the following improvement is made, the connecting head includes the installation part where the middle mold body is installed by bolts and the joint part where both ends of the bottom surface of the installation part are affixed to the output end of the corresponding cylinder.

On the basis of the above-mentioned embodiment, the following improvements are made, the initial forming area includes L-shaped knuckles, V-shaped knuckles and horizontal abutments arranged in sequence from the right front to the back, the L-shaped knuckles are arranged obliquely, and the top of the L-shaped knuckles and the horizontal abutment Coplanar.

On the basis of the above-mentioned embodiment, the following improvements are made, the lower mold base is provided with installation grooves for installing cylinder one and cylinder two, and threaded holes are arranged on the sides of the installation grooves.

On the basis of the above embodiment, the following improvements are made, the manufacturing process of the middle mold body, the lower mold body, and the upper mold body, the processing steps are as follows: the middle mold body, the lower mold body, and the upper mold body with 42CrMo as raw materials Oxidation treatment after nitriding, tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, pure water, and absolute ethanol are prepared in a ratio of 1:4 to 57 to 8:3 to 4. The middle mold body, lower mold body, and upper mold body are placed in 25-35 times the amount of deposition liquid, 45-60 Hz ultrasonic reaction is performed for 2-4 hours, and then 0.02-0.08 times the amount of tetraethoxysilane is added to nanometer yttrium oxide. Ultrasonic reaction at 45-60Hz for 2-4 hours, take it out and wash it twice with 250mL pure water, wash it twice with 180mL of 95% ethanol, dry it at 85-95° for 4-6 hours, then put it in the reactor, and vacuum it to make the pressure reach 3.5~4.5MPa, feed gaseous titanium tetrachloride 0.05~0.12 times the amount of tetraethoxysilane, the temperature of the reactor rises to 330~350°, vacuumize again to make the pressure reach 3.5~4.5MPa, and then introduce mixed reduction Gas until the pressure reaches 75-95MPa, and then the temperature of the middle mold body, lower mold body and upper mold body is 800-1200°, and the deposition is performed for 5-8 hours.

After nitriding and oxidation treatment of 42CrMo, there will be ferric oxide on the surface of the nitriding layer with certain magnetic properties. Use tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, pure water, and absolute ethanol to press The silicon solution is configured in a certain proportion, and deposited in two times under the ultrasonic reaction. First, the silicon dioxide is wrapped on the outside of the ferroferric oxide to form a stable Si-O-Fe chemical bond to form a bond and obtain the initial layer of deposition. The introduction of yttrium oxide into the silicon solution will form the final deposition layer due to the existence of stable Si-O-Y chemical bonds, and then complete the deposition of a porous silicon dioxide layer modified with doped yttrium on the surface of the nitrided layer, and then use porous and doped yttrium modified The silicon dioxide layer is in the gaseous titanium tetrachloride atmosphere, titanium tetrachloride will enter the porous silicon dioxide and undergo cross-linking, hydrolysis, and condensation reactions with the amino groups on it to form a titanium dioxide cross-linking network, and finally in Titanium carbide is formed by high-temperature reduction in a reducing atmosphere containing methane. Since the silicon dioxide layer is doped with yttrium, when forming titanium carbide, yttrium can make the primary titanium carbide dendrites become finer, the dendrite spacing increases, and the slender strips The increase of eutectic titanium carbide results in ultra-fine-grained titanium carbide, which increases the wettability of the interface at the yttrium-purified interface, enabling it to be uniformly and dispersed in the silicon dioxide layer with high density. When microcracks and residual stress are generated around the fine-grained titanium carbide, it can pin the cracks and consume fracture energy, thereby improving the toughness of the coating material.

In the further technical solution above, the mixed reducing gas includes one or more of hydrogen and silane in addition to methane. When silane is added, silicon carbide can be distributed in titanium carbide crystals with high density, and binary and or ternary eutectic phases will appear at the same time.

The molding method of the multi-section angular door frame uses the molding die described above, and the molding process includes:

Step 1: Place the plate at the positioning area on the horizontal plane formed by the L-shaped corner and the horizontal bearing platform;

Step 2: The upper mold body moves down, and the plate is folded out of the initial shape of the folded structure through the forming area of the lower part of the upper mold body and the initial forming area of the middle mold body, and the upper mold body goes up and resets;

Step 3: Take out the plate that has been processed into the initial shape of the folded structure, and insert the unprocessed horizontal section into the positioning area between the lower mold body and the installation part, and then form the outer wall of the pressure head against the folded structure The right angle of the initial shape of the original shape is positioned, and at the same time, the V-shaped structure of the initial shape of the folded structure is inside the secondary forming area;

Step 4: Place the new plate in the positioning area of the horizontal plane formed by the L-shaped corner and the horizontal bearing platform, and form the initial shape of the new plate by moving the upper mold body downwards, and at the same time, the V in the secondary forming area. The shape structure can be folded out of the final shape of the final folded structure.

Description of drawings

Fig. 1 is the side view of overall structure of the present invention;

Fig. 2 is the front view of overall structure of the present invention;

Fig. 3 is the connection relationship figure of lower mold body and lower mold base of the present invention;

Fig. 4 is the side view of lower mold body of the present invention;

Fig. 5 is a side view of the lower mold base of the present invention;

Fig. 6 is a schematic structural view of the final workpiece of the present invention.

Among the figure: 10, lower mold base; 11, cylinder one; 12, cylinder two; 13, connector; 131, installation part; 132, joint; 14, middle mold body; 15, lower mold body; 151, connection part; 152. Secondary forming pressure head; 16. L-shaped knuckle; 17. V-shaped knuckle; 18. Horizontal cap; 19. Installation groove; 20. Upper mold body.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, so as to Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

Embodiment 1: As shown in Figures 1 to 6, a pneumatic upper and lower mold for forming a door frame includes a lower mold base 10 and an upper mold body 20, and the lower mold base 10 is equipped with cylinders 11 at both ends and a cylinder in the middle Two 12, the lower mold base 10 is provided with an installation groove 19 for installing cylinder one 11 and cylinder two 12 and the side of the installation groove 19 is provided with threaded holes.

The output end of cylinder one 11 is equipped with connecting head 13, and connecting head 13 comprises the installation part 131 of mold body 14 through bolt installation and is arranged with the joint part 132 that two ends of bottom surface of installation part 131 are affixed with corresponding cylinder one 11 output ends. The top of the connector 13 (installation part 131) is installed with the middle mold body 14 by bolts, and the top of the middle mold body 14 is provided with a preliminary molding area adapted to the molding area of the upper mold body 20, and the preliminary molding area includes the right front to the rear. The L-shaped knuckle 16, the V-shaped knuckle 17, and the horizontal bearing platform 18, the L-shaped knuckle 16 is arranged obliquely and the top of the L-shaped knuckle 16 is coplanar with the horizontal bearing platform 18. With the top of the L-shaped knuckle 16 and the horizontal platform 18 being in the same plane, when the upper mold body 20 is moved down to form, the plate is bent at the same time on the left side and the right side of the L-shaped knuckle 16 with the top as the boundary. The plate on the right is first bent by the right part of the L-shaped knuckle 16, and then the key structure is formed by the V-shaped knuckle 17. After the key structure is formed, the folded structure completes the initial shape.

It should be specifically explained here that since the angle of the L-shaped knuckle 16 is generally 90°, if it is not arranged obliquely, the initial processing of the folded structure cannot be carried out. Once it is set as an oblique structure, due to the It is a single set of molds and uses the short-distance retraction characteristics of the cylinder piston rod, so that the angle of the V-shaped knuckle 17 will be relatively small, generally only about 25°, which will make the processing and molding of the V-shaped knuckle 17 easier. more difficult.

The lower mold body 15 is also installed on the lower mold base 10, which is located at the lower part of the mounting part 131 of the connector 13. The output end of the cylinder 2 12 is connected to the bottom of the lower mold body 15, and the piston rod of the cylinder 12 is retracted in a short distance. , the lower mold body 15 can form the V-shaped structure 17 after the initial shape into the final shape processing of the folded structure, and the area between the lower mold body 15 and the lower mold base 10 is the secondary molding area.

The lower mold body 15 includes a connecting part 151 connected to the output end of the cylinder two 12 and relatively sliding with the lower mold base 10, and a secondary forming pressure head 152 integrally connected with the connecting part 151. The bottom surface of the secondary forming pressure applying head 152 and the lower mold A secondary forming area is formed between the top surfaces of the seat 10 , and a positioning area is formed between the top surface of the secondary forming pressing head 152 and the bottom surface of the connecting head 13 located directly above the secondary forming pressing head 152 .

The surfaces of the middle mold body 14, the lower mold body 15 and the upper mold body 20 are all provided with Ti-xY wear-resistant alloy layers.

When in use, the board is first placed in the positioning area of the horizontal plane formed by the L-shaped knuckle 16 and the horizontal platform 18, the upper mold body 20 moves down, the board is folded out of the initial shape of the folded structure, and then the horizontal plane of the board is The section part is inserted in the positioning area between the lower mold body 15 and the installation part 131, and the right angle of the initial shape of the folded structure is positioned through the outer wall of the secondary forming pressure head 152, and the V-shaped structure of the initial shape of the folded structure is Inside the secondary forming area, the new plate is placed in the positioning area of the horizontal plane formed by the L-shaped corner 16 and the horizontal platform 18, and the upper mold body 20 is moved down to form the initial shape of the folded structure of the new plate, and at the same time The V-shaped structure located in the secondary forming area can be folded out of the final shape of the final folded structure, and the bending process of the key structure can be completed using only one set of molds in two steps.

Embodiment 2: make following improvement on the basis of above-mentioned embodiment: the manufacturing process of middle mold body 14, lower mold body 15, upper mold body 20, processing steps are as follows: take 42CrMo as raw material steel middle mold body 14, lower mold body The mold body 15 and the upper mold body 20 are oxidized after nitriding, and the deposition solution is prepared with tetraethoxysilane, ammonia water with a mass fraction of 28%, pure water, and absolute ethanol in a ratio of 1:4:7:3. After the heat treatment, the middle mold body 14, the lower mold body 15, and the upper mold body 20 are placed in 25 to 35 times the amount of deposition liquid, 45 to 60 Hz ultrasonic reaction for 2 to 4 hours, and then 0.03 times the amount of tetraethoxysilane is added. Yttrium oxide, 45-60Hz ultrasonic reaction for 2-4 hours, take it out and wash it twice with 250mL pure water, wash it twice with 180mL 95% ethanol, dry it at 85-95° for 4-6 hours, then put it in the reactor and vacuumize Make the pressure reach 3.5-4.5MPa, feed gaseous titanium tetrachloride 0.05-0.12 times the amount of tetraethoxysilane, the temperature of the reactor rises to 345°, vacuumize again to make the pressure reach 3.5-4.5MPa, and then feed the mixed Reducing the gas until the pressure reaches 75-95MPa, and then the temperature of the middle mold body 14, the lower mold body 15, and the upper mold body 20 is 1150°, and the Ti-xY wear-resistant alloy layer is obtained by depositing for 5-8 hours.

Embodiment 3: make following improvement on the basis of above-mentioned embodiment: the manufacturing process of middle mold body 14, lower mold body 15, upper mold body 20, processing steps are as follows: take 42CrMo as raw material steel middle mold body 14, lower mold body The mold body 15 and the upper mold body 20 are oxidized after nitriding, and tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, pure water, and absolute ethanol are deposited in a ratio of 1:5:8:4 solution, put the heat-treated middle mold body 14, lower mold body 15, and upper mold body 20 in 25 to 35 times the amount of deposition liquid, 45 to 60 Hz ultrasonic reaction for 2 to 4 hours, and then add tetraethoxysilane 0.05 times A certain amount of nano-yttrium oxide, 45-60Hz ultrasonic reaction for 2-4h, take it out and wash it twice with 250mL pure water, wash it twice with 180mL of 95% ethanol, dry it at 85-95° for 4-6h, and then put it in the reactor , evacuate to make the pressure reach 3.5-4.5MPa, feed gaseous titanium tetrachloride 0.05-0.12 times the amount of tetraethoxysilane, the temperature of the reactor rises to 340°, evacuate again to make the pressure reach 3.5-4.5MPa, and then Introduce mixed reducing gas until the pressure reaches 75-95 MPa, then set the temperature of middle mold body 14, lower mold body 15, and upper mold body 20 at about 1000°, and deposit for 7 hours to obtain Ti-xY wear-resistant alloy layer.

Embodiment 4: make following improvement on the basis of above-mentioned embodiment: the manufacturing process of middle mold body 14, lower mold body 15, upper mold body 20, processing steps are as follows: take 42CrMo as raw material steel middle mold body 14, lower mold body The mold body 15 and the upper mold body 20 are oxidized after nitriding, and tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, pure water, and absolute ethanol are deposited in a ratio of 1:4:8:3 solution, put the heat-treated middle mold body 14, lower mold body 15, and upper mold body 20 in 25 to 35 times the amount of deposition liquid, 45 to 60 Hz ultrasonic reaction for 2 to 4 hours, and then add 0.04 times of tetraethoxysilane A certain amount of nano-yttrium oxide, 45-60Hz ultrasonic reaction for 2-4h, take it out and wash it twice with 250mL pure water, wash it twice with 180mL of 95% ethanol, dry it at 85-95° for 4-6h, and then put it in the reactor , evacuate to make the pressure reach 3.5-4.5MPa, feed gaseous titanium tetrachloride 0.05-0.12 times the amount of tetraethoxysilane, the temperature of the reactor rises to 350°, and evacuate again to make the pressure reach 3.5-4.5MPa, then Introduce mixed reducing gas until the pressure reaches 75-95 MPa, then set the temperature of middle mold body 14, lower mold body 15, and upper mold body 20 at about 950°, and deposit for 7 hours to obtain a Ti-xY wear-resistant alloy layer.

Comparative example 1: only post-nitriding oxidation treatment.

Comparative example 2: the middle mold body 14, the lower mold body 15, and the upper mold body 20, which are made of 42CrMo, are oxidized after nitriding, and tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, and pure water , Absolute ethanol according to the ratio of 1:4～5:7～8:3～4 to configure the deposition solution, and place the heat-treated middle mold body 14, lower mold body 15, and upper mold body 20 in 25 to 35 times the amount of In the deposition solution, ultrasonically react at 45-60 Hz for 2-4 hours, take it out, wash it twice with 250 mL of pure water, wash it twice with 180 mL of 95% ethanol, dry it at 85-95° for 4-6 hours, then put it in the reactor, pump Vacuum the pressure to 3.5-4.5MPa, feed gaseous titanium tetrachloride 0.05-0.12 times the amount of tetraethoxysilane, the temperature of the reactor rises to 330-350°, and vacuum again to make the pressure 3.5-4.5MPa, and then Inject the mixed reducing gas until the pressure reaches 75-95 MPa, and then deposit for 7 hours with the temperature of the middle mold body 14, the lower mold body 15, and the upper mold body 20 at 800-1200°.

Comparative Example 3: The middle mold body 14, the lower mold body 15, and the upper mold body 20, which are made of 42CrMo, are oxidized after nitriding, and tetraethoxysilane, ammonia water with a mass fraction of 25% to 28%, and pure water , Absolute ethanol according to the ratio of 1:4～57～8:3～4 to configure the deposition solution, put the heat-treated middle mold body 14, lower mold body 15, and upper mold body 20 in 25 to 35 times the amount of deposition liquid 45-60Hz ultrasonic reaction for 2-4h, 45-60Hz ultrasonic reaction for 2-4h, take out and wash twice with 250mL pure water, wash twice with 180mL 95% ethanol, dry at 85-95° for 4-6h, then Put it in the reactor, evacuate to make the pressure reach 3.5-4.5MPa, then introduce mixed reducing gas until the pressure reaches 75-95MPa, introduce titanium wire and add it to about 2000°, and then use the middle mold body 14 and the lower mold body 15 1. The temperature of the upper mold body 20 is 800-1200° for deposition for 6 hours.

The performance analysis results of the density performance and wear resistance performance of the Ti-xY wear-resistant alloy layer adopting the embodiments of the present invention 2 to 4 and comparative examples 1 to 3 are as follows:

The molding method of multi-section angular door frame uses the molding die described in embodiment 1 and embodiment 2, and molding process comprises:

Step 1: Place the plate in the positioning area of the horizontal plane formed by the L-shaped knuckle 16 and the horizontal platform 18;

Step 2: the upper mold body 20 moves down, and the plate is folded out of the initial shape of the folded structure through the forming area of the lower part of the upper mold body 20 and the initial forming area of the middle mold body 14, and the upper mold body 20 goes up and resets;

Step 3: Take out the plate that has been processed into the initial shape of the folded structure, and insert the unprocessed horizontal section into the positioning area between the lower mold body 15 and the installation part 131, and then form the outer wall of the pressure head 152 Position the right angle of the initial shape of the folded structure, and at the same time, the V-shaped structure of the initial shape of the folded structure is inside the secondary forming area;

Step 4: Place the new board in the positioning area of the horizontal plane formed by the L-shaped corner 16 and the horizontal bearing platform 18, and form the new board into the initial shape of the folded structure by moving the upper mold body 20 downwards, and at the same time, it is located in the secondary forming area The V-shaped structure at can be folded out of the final shape of the final folded structure.

The above descriptions are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a partial structure, device, or method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution of the present invention and its inventive concepts shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a many edges and corners door frame forming die, a serial communication port, including die holder (10) and last mould (20), install cylinder (11) that are located both ends and cylinder two (12) that are located the middle part on die holder (10), connector (13) are installed to the output of cylinder (11), well die body (14) are installed through the bolt in the top of connector (13), the top of well die body (14) is laid and is gone up the primary forming region of mould (20) shaping regional adaptation, still install lower die body (15) that are located connector (13) lower part on die holder (10), the output of cylinder two (12) is connected with the bottom of lower die body (15), it is regional for the secondary forming between lower die body (15) and die holder (10), well die body (14), lower die body (15), the surface of last die body (20) all is equipped with Ti-xY wear-resistant alloy layer.

2. The forming die for the polygonal doorframe according to claim 1, wherein the lower die body (15) comprises a connecting part (151) connected with the output end of the second cylinder (12) and sliding relative to the lower die holder (10), and a secondary forming Shi Yatou (152) integrally connected with the connecting part (151), a secondary forming area is defined between the bottom surface of the secondary forming Shi Yatou (152) and the top surface of the lower die holder (10), and a positioning area is defined between the top surface of the secondary forming Shi Yatou (152) and the bottom surface of the connecting head (13) positioned right above the secondary forming Shi Yatou (152).

3. The forming die for the door frame with the multiple corners as claimed in claim 1, wherein the connecting head (13) comprises a mounting portion (131) for mounting the middle die body (14) through bolts and a connecting head portion (132) provided with two ends of the bottom surface of the mounting portion (131) and fixedly connected with the output end of the corresponding cylinder I (11).

4. The forming die for the door frame with the multiple corners as claimed in claim 1, wherein the primary forming area comprises an L-shaped folded angle (16), a V-shaped folded angle (17) and a horizontal bearing platform (18) which are sequentially arranged from front right to back, the L-shaped folded angle (16) is obliquely arranged, and the top of the L-shaped folded angle (16) is coplanar with the horizontal bearing platform (18).

5. The forming die for the polygonal doorframe according to claim 1, wherein mounting grooves (19) for mounting a first cylinder (11) and a second cylinder (12) are formed in the lower die holder (10), and threaded holes are formed in the side portions of the mounting grooves (19).

6. The forming die for the polygonal doorframe according to claim 1, wherein the processing method of the middle die body (14), the lower die body (15) and the upper die body (20) comprises the following processing steps: nitriding a middle mold (14), a lower mold (15) and an upper mold (20) which take 42CrMo as raw materials, and then oxidizing, wherein tetraethoxysilane, 25-28% of ammonia water, pure water and absolute ethyl alcohol are mixed according to the mass ratio of 1: 4-57-8: 3-4, placing the middle mold (14), the lower mold (15) and the upper mold (20) after heat treatment in 25-35 times of deposition solution, carrying out 45-60 Hz ultrasonic reaction for 2-4 h, adding 0.02-0.08 times of nano yttrium oxide of tetraethoxysilane, carrying out 45-60 Hz ultrasonic reaction for 2-4 h, taking out, washing with 250mL of pure water for 2 times, washing with 180mL of 95% ethanol for 2 times, drying at 85-95 ℃ for 4-6 h, placing in a reactor, vacuumizing until the pressure reaches 3.5-4.5 MPa, introducing 0.05-0.12 times of gaseous titanium tetrachloride of tetraethoxysilane, raising the temperature of the reactor to 330-350 ℃, vacuumizing again until the pressure reaches 3.5-4.5 MPa, introducing mixed reducing gas until the pressure reaches 75-95 MPa, and depositing for 5-8 h by using the middle mold (14), the lower mold (15) and the upper mold (20) at 800-1200 ℃.

7. The mold according to claim 6, wherein the mixed reducing gas comprises one or more of hydrogen and silane in addition to methane.

8. The method for forming a polygonal doorframe, characterized in that the forming mold according to any one of claims 1 to 7 is used, and the forming process comprises:

the method comprises the following steps: placing the plate at a positioning area of a horizontal plane formed by the L-shaped bevel (16) and the horizontal bearing platform (18);

step two: the upper die body (20) moves downwards, the plate is folded into a primary form of a reverse-folding structure through a forming area at the lower part of the upper die body (20) and a primary forming area of the middle die body (14), and the upper die body (20) moves upwards and resets;

step three: taking the plate processed with the primary shape of the reverse structure away, inserting the unprocessed horizontal section part into a positioning area between the lower die body (15) and the mounting part (131), positioning the right angle of the primary shape of the reverse structure through the outer wall of the secondary forming Shi Yatou (152), and simultaneously positioning the V-shaped structure of the primary shape of the reverse structure in the secondary forming area;

step four: the new plate is arranged at a positioning area of a horizontal plane formed by the L-shaped folding angle (16) and the horizontal bearing platform (18), the upper die body (20) moves downwards to form an initial shape of the folding structure, and meanwhile, the V-shaped structure at the secondary forming area can be folded to form a final shape of the final folding structure.

Images