A kind of model repairing method for investment precision casting

Abstract

The invention discloses a model repairing method for precision casting of a fired mold. The method comprises the following steps: S1, tailoring a paperboard piece which is matched with a model structure changing part according to the changing demand of the model structure; S2, putting the paperboard piece in boiling paraffin, soaking the paperboard piece in the paraffin for 10-30 minutes and then cooling the paraffin-soaked paperboard piece; S3, preparing AB glue in a proportion of 1: 1, and adhering the paraffin-soaked paperboard piece to the part of the model structure needed to be changed by using the AB glue; S4, leaving the adhering part in the S3 to stand for 12-24h; S5, then repairing an adhering joint between the paraffin-soaked paperboard piece and the model structure by using paraffin / repair wax; and S6, performing investment casting to obtain the model structure required according to the changing requirement based on the original model structure. The time of repairing the mold or using a 3D printed mold is shortened, and the production cost is lowered. The method disclosed by the invention can precisely increase the local wall thickness of the model and changes the local structure of the model, so that the model is repaired.

Description

technical field

[0001] The invention belongs to the technical field of model recovery, and relates to a model repair method for investment precision casting. Background technique

[0002] With the rapid development of my country's aerospace industry, the casting structure is gradually becoming larger and more complex. In the process of designing a new type of casting, designers often hope to conduct all-round experimental tests on the first produced casting at the fastest speed and at the lowest cost, so as to optimize the design or finalize the design. The investment casting process is to make model molds, press wax patterns, combine pouring systems, make mold shells, and pour into shapes. In this process, the production cycle of the model mold is the longest. According to the structure of the casting, the production cycle of the metal mold is generally 1.5-6 months. If the structure of the casting is complex, the mold making may take longer. The price of metal molds also...

Examples

Embodiment 1

[0025] The specific process of model repair is as follows:

[0026] Step 1. Select a cardboard with a thickness of 1.4mm, and cut the cardboard into 57×90mm according to the requirements for changing the structure of the frame casting 2 4 pieces of cardboard pieces, 66×90mm 2 2 pieces of cardboard pieces, and a skeleton-shaped cardboard piece of 57mm×90mm×66mm.

[0027] Step 2: Put the cardboard piece obtained in step 1 into boiling paraffin for 30 minutes of wax-impregnation treatment until no air bubbles overflow from the surface of the cardboard piece, take out the cardboard and place it on a filter for cooling to obtain a wax-impregnated cardboard piece.

[0028] Step 3: Prepare AB glue in a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard parts and the frame casting model, then let them dry separately for 3 minutes, and then glue the wax-impregnated cardboard parts on the frame The corresponding parts of the ca...

Embodiment 2

[0034] Partially adjust the frame casting of an aerospace exploration equipment, the specific process is:

[0035] Step 1: Select a cardboard with a thickness of 3mm, and cut the cardboard to 57×14.3mm according to the requirements for changing the structure of the frame casting 2 2 pieces of cardboard, 66×14.3mm 2 2 cardboard pieces, and 10×12×11mm 3 1 piece of three-dimensional cardboard.

[0036] Step 2, put the cardboard piece obtained in step 1 into boiling paraffin, and perform a wax-impregnated treatment for 10 minutes until no bubbles overflow from the surface of the cardboard piece, then take out the cardboard piece and cool it down to obtain a wax-impregnated cardboard piece.

[0037] Step 3: Prepare AB glue at a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard and frame casting models, and after drying for 8 minutes, glue them together accordingly.

[0038] Step 4, place a 1kg sandbag on the bonded part ...

Embodiment 3

[0043] To increase the local wall thickness of a missile casting by 1mm, the specific process is:

[0044] Step 1: Select a cardboard with a thickness of 0.8mm, and cut the cardboard into 50×130mm according to the requirements for changing the structure of the frame casting 2 1 piece of cardboard.

[0045] Step 2, put the cardboard piece obtained in step 1 into boiling paraffin, and perform wax-impregnation treatment for 20 minutes until no bubbles overflow from the surface of the cardboard piece, take out the cardboard piece and cool it down to obtain a wax-impregnated cardboard piece.

[0046] Step 3: Prepare AB glue in a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard and frame casting models, and after drying for 5 minutes, glue them together accordingly.

[0047] Step 4, place a 3kg sandbag on the bonded part treated in step 3, and let it stand for 16 hours.

[0048] Step 5, use paraffin or repair wax to fill ...

technical field

[0001] The invention belongs to the technical field of model recovery, and relates to a model repair method for investment precision casting. Background technique

[0002] With the rapid development of my country's aerospace industry, the casting structure is gradually becoming larger and more complex. In the process of designing a new type of casting, designers often hope to conduct all-round experimental tests on the first produced casting at the fastest speed and at the lowest cost, so as to optimize the design or finalize the design. The investment casting process is to make model molds, press wax patterns, combine pouring systems, make mold shells, and pour into shapes. In this process, the production cycle of the model mold is the longest. According to the structure of the casting, the production cycle of the metal mold is generally 1.5-6 months. If the structure of the casting is complex, the mold making may take longer. The price of metal molds also...

Examples

Embodiment 1

[0025] The specific process of model repair is as follows:

[0026] Step 1. Select a cardboard with a thickness of 1.4mm, and cut the cardboard into 57×90mm according to the requirements for changing the structure of the frame casting 2 4 pieces of cardboard pieces, 66×90mm 2 2 pieces of cardboard pieces, and a skeleton-shaped cardboard piece of 57mm×90mm×66mm.

[0027] Step 2: Put the cardboard piece obtained in step 1 into boiling paraffin for 30 minutes of wax-impregnation treatment until no air bubbles overflow from the surface of the cardboard piece, take out the cardboard and place it on a filter for cooling to obtain a wax-impregnated cardboard piece.

[0028] Step 3: Prepare AB glue in a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard parts and the frame casting model, then let them dry separately for 3 minutes, and then glue the wax-impregnated cardboard parts on the frame The corresponding parts of the ca...

Embodiment 2

[0034] Partially adjust the frame casting of an aerospace exploration equipment, the specific process is:

[0035] Step 1: Select a cardboard with a thickness of 3mm, and cut the cardboard to 57×14.3mm according to the requirements for changing the structure of the frame casting 2 2 pieces of cardboard, 66×14.3mm 2 2 cardboard pieces, and 10×12×11mm 3 1 piece of three-dimensional cardboard.

[0036] Step 2, put the cardboard piece obtained in step 1 into boiling paraffin, and perform a wax-impregnated treatment for 10 minutes until no bubbles overflow from the surface of the cardboard piece, then take out the cardboard piece and cool it down to obtain a wax-impregnated cardboard piece.

[0037] Step 3: Prepare AB glue at a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard and frame casting models, and after drying for 8 minutes, glue them together accordingly.

[0038] Step 4, place a 1kg sandbag on the bonded part ...

Embodiment 3

[0043] To increase the local wall thickness of a missile casting by 1mm, the specific process is:

[0044] Step 1: Select a cardboard with a thickness of 0.8mm, and cut the cardboard into 50×130mm according to the requirements for changing the structure of the frame casting 2 1 piece of cardboard.

[0045] Step 2, put the cardboard piece obtained in step 1 into boiling paraffin, and perform wax-impregnation treatment for 20 minutes until no bubbles overflow from the surface of the cardboard piece, take out the cardboard piece and cool it down to obtain a wax-impregnated cardboard piece.

[0046] Step 3: Prepare AB glue in a ratio of 1:1, and then apply it evenly on the parts that need to be changed on the wax-impregnated cardboard and frame casting models, and after drying for 5 minutes, glue them together accordingly.

[0047] Step 4, place a 3kg sandbag on the bonded part treated in step 3, and let it stand for 16 hours.

[0048] Step 5, use paraffin or repair wax to fill ...