CN111774527A - A kind of wax mold making process for key lock - Google Patents

Abstract

The invention discloses a process for making a wax mold using locking keys, comprising the following steps: S1, preparing the wax mold raw materials including rosin resin, ethylene glycol diglycidyl ether, lauroyl diethanolamine, trihydroxy polyether, molybdenum disulfide ; S2, after stirring the rosin resin, lauroyl diethanolamine, molybdenum disulfide and an appropriate amount of ethanol, add ethylene glycol diglycidyl ether and trihydroxy polyether, and heat up and stir to obtain a wax material; S3, take the wax material as a mold materials, to make the wax pattern; S4, use the flat head type electric iron to make the wax pattern tree, that is, get the key-locking mould shell; S5, put the key-locking mould shell in the electric heating steam dewaxing kettle, and pass the steam to The wax on the surface of the key-lock mold shell is completely removed, that is, the wax mold making process is completed. The wax mold manufacturing process proposed by the invention is simple and easy to implement, and the prepared wax mold can be applied to the production of lock keys with high dimensional accuracy and high surface finish.

Description

A kind of wax mold making process for key lock

technical field

The invention relates to the technical field of investment casting, in particular to a process for making wax molds for locking keys.

Background technique

The lock key is one of the common auxiliary accessories on the device, which is widely used in automobiles, mechanical equipment and other fields. In recent years, with the continuous development of science and technology, the utilization rate of automobiles and mechanical products is increasing day by day, resulting in a significant increase in the demand for lock keys. At present, the main method of factory production of lock keys is through investment casting. The wax mold is the most important auxiliary material in investment casting. A wax mold is required for each set of castings. Therefore, the quality of the wax mold will directly affect the size and surface finish of the casting. In order to obtain high-quality castings, many researchers at home and abroad have invested a lot of energy in the field of wax mold making. Although the quality of wax molds has improved, there are still some drawbacks. For example, the dimensional accuracy of lock keys produced by using existing wax molds is not good High, the surface finish of the lock key is not ideal, etc. Based on the deficiencies in the prior art, the present invention proposes a process for making a wax mold for locking keys.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems of low dimensional accuracy of the lock key product, unsatisfactory surface finish of the lock key and low quality of the lock key product when using the existing wax mold to produce the lock key. wax mold making process.

The wax mold making process for key locking includes the following steps:

S1. Prepare wax mold raw materials: The wax mold raw materials, in parts by weight, include 100 parts of rosin resin, 23 to 46 parts of ethylene glycol diglycidyl ether, 2 to 4 parts of lauroyl diethanolamine, and 1.4 to 2.6 parts of trihydroxy polyether. , 0.2～0.6 parts of molybdenum disulfide;

S2, preparation of wax material: put the rosin resin, lauroyl diethanolamine and molybdenum disulfide weighed in step S1 into a reaction flask, add an appropriate amount of ethanol, and under the condition of 60～70℃, at a speed of 200～300r/min Stir for 25-30min, add the ethylene glycol diglycidyl ether and trihydroxy polyether weighed in step S1 into the reaction flask, heat up to 100-105°C, continue stirring for 1-2h, and cool to room temperature to obtain wax;

S3, making the wax pattern: using the wax material prepared in step S2 as the mold material, a vertical double-station cylinder-free wax injection machine is used to make the wax pattern, the injection pressure is 28～32kg/cm ² , and the temperature is 63～67 °C;

S4. Wax-type tree: After heating and melting the connection part of the wax-type with a flat-head electric iron, weld several wax-types together according to the design requirements to obtain the key part, and then connect the key part to the pouring pool. Parts are welded together to complete the wax-up tree. In the process of tree grouping, the two sides of the groove are melted and filled with welding wire, and the welding wire must always be under the protection of argon gas. The arc cannot be stopped during the cutting and welding process. Solidification, solidification after pouring the pool part, and the wax-shaped tree formation is completed to obtain the key-locking formwork;

S5. Dewaxing film: place the key-locking mould shell prepared in step S4 in an electric heating steam dewaxing kettle, pass 0.7-0.9MPa steam, and heat until the wax on the surface of the key-locking mould shell is completely removed, that is, Complete the wax mold making process.

Preferably, in step S1, the wax mold raw materials, in parts by weight, include 100 parts of rosin resin, 34 parts of ethylene glycol diglycidyl ether, 3 parts of lauroyl diethanolamine, 2 parts of trihydroxypolyether, and molybdenum disulfide. 0.4 servings.

Preferably, when the wax pattern is made in step S3, the wax injection time is 1.5-2.5s, and the pressure holding time is 1-5s.

Preferably, when making the wax pattern in step S3, the temperature of the wax box is controlled at 88-92°C.

Preferably, in step S4, during the welding operation, the surrounding environment should be windless and the relative humidity should not be higher than 70%.

Preferably, in step S4, during the welding operation, the welding speed is 20-30 mm/s, the gas flow rate is 8-9 L/min, and the joints of the two wax-shaped connecting parts are staggered by 29-31 mm for welding.

Preferably, the wax-up tree set in step S4 also includes post-processing operations, and the specific steps of the post-processing operations are: placing the prepared key-locking mold shell in a cleaning agent for cleaning and immediately drying at high temperature, and the The cleaning agent is made up of palm alcohol, sorbitol and water with a mass ratio of 0.2 to 0.4: 0.6 to 1.2: 100.

Compared with the prior art, the beneficial effects of the present invention are:

1. The wax mold manufacturing process proposed by the present invention is simple and easy to implement, with conventional equipment and low production cost. High-quality wax molds are prepared, especially for making lock keys, and the lock keys produced have high dimensional accuracy and good surface finish, which effectively solves the problem of low dimensional accuracy of the lock keys produced when using the existing wax mold to produce lock keys. , The surface finish of the lock key is not ideal, and the quality of the lock key product is low;

2. The wax material used in the wax mold making process of the present invention is prepared from a reasonable proportion of rosin resin, ethylene glycol diglycidyl ether, lauroyl diethanolamine, trihydroxy polyether and molybdenum disulfide, and has excellent processing properties. Formability, and by controlling the wax injection pressure, temperature, wax injection and pressure holding time, wax box temperature, and the sequence and welding method of the wax type tree to ensure the obtained wax mold has high precision and high surface finish, and then Ensure that the dimensional accuracy of the lock keys produced by it meets the requirements, the product qualification rate is high, the product surface is smooth, and the quality is high.

Detailed ways

The present invention will be further explained below in conjunction with specific embodiments.

Example 1

The wax mold making process for locking keys proposed by the present invention comprises the following steps:

S1. Prepare wax mold raw materials: The wax mold raw materials are based on parts by weight, including 100 parts of rosin resin, 23 parts of ethylene glycol diglycidyl ether, 4 parts of lauroyl diethanolamine, 1.4 parts of trihydroxy polyether, and 0.2 parts of molybdenum disulfide. ;

S2, preparation of wax material: put the rosin resin, lauroyl diethanolamine and molybdenum disulfide weighed in step S1 into a reaction flask, add an appropriate amount of ethanol, and stir at a speed of 200 r/min for 30 min at 60 ° C. The ethylene glycol diglycidyl ether and trihydroxy polyether weighed in step S1 are added to the reaction flask, the temperature is raised to 100 ° C, the stirring is continued for 1 h, and the wax is obtained by cooling to room temperature;

S3. Making a wax pattern: using the wax material prepared in step S2 as a mold material, a vertical double-station cylinder-free wax injection machine is used to make the wax pattern. The injection pressure is 28kg/cm ² , the temperature is 67° C., and the wax injection The time is 1.5s, the holding time is 1s, and the temperature of the wax box is controlled at 88°C;

S4. Wax-type tree: After heating and melting the connection part of the wax-type with a flat-head electric iron, weld several wax-types together according to the design requirements to obtain the key part, and then connect the key part to the pouring pool. Parts are welded together to complete the wax-up tree. During the tree-assembly process, the welding speed is 20mm/s, the gas flow rate is 8L/min, and the joints of the two wax-up connection parts are staggered by 29mm for welding, and both sides of the groove are melted. Then fill in the welding wire, and the welding wire should always be under the protection of argon gas, the surrounding environment should be free of wind, and the relative humidity should not be higher than 70%, the arc should not be stopped during the cutting and welding process, the locking part will be solidified first, and the pouring pool will be solidified later. After the wax-shaped tree is completed, the key-locking mould shell is obtained, and the obtained key-locking mould shell is placed in a cleaning agent for cleaning and then immediately dried at high temperature. The cleaning agent is composed of palm alcohol, Combination of sorbitol and water;

S5. Dewaxing film: put the key-locking mould shell after drying in step S4, put it in the electric heating steam dewaxing kettle, pass 0.7MPa steam, and heat it until the wax on the surface of the key-locking mould shell is completely removed, that is, the wax is completed. Mold making process.

Example 2

The wax mold making process for locking keys proposed by the present invention comprises the following steps:

S1, prepare wax mold raw materials: wax mold raw materials, in parts by weight, include 100 parts of rosin resin, 34 parts of ethylene glycol diglycidyl ether, 3 parts of lauroyl diethanolamine, 2 parts of trihydroxypolyether, and 0.4 parts of molybdenum disulfide. ;

S2, prepare wax material: put the rosin resin, lauroyl diethanolamine and molybdenum disulfide weighed in step S1 into a reaction flask, add an appropriate amount of ethanol, and stir at a speed of 250r/min for 30min at 65°C. The ethylene glycol diglycidyl ether and trihydroxy polyether weighed in step S1 are added to the reaction flask, the temperature is raised to 105 ° C, the stirring is continued for 1.5 h, and the wax material is obtained by cooling to room temperature;

S3. Making the wax pattern: using the wax material prepared in step S2 as the mold material, a vertical double-station cylinder-free wax injection machine is used to make the wax pattern. The injection pressure is 30kg/cm ² , the temperature is 65°C, and the wax injection The time is 2s, the holding time is 3s, and the temperature of the wax box is controlled at 90℃;

S4. Wax-type tree: After heating and melting the connection part of the wax-type with a flat-head electric iron, weld several wax-types together according to the design requirements to obtain the key part, and then connect the key part to the pouring pool. Parts are welded together to complete the wax-up tree. During the tree-assembly process, the welding speed is 25mm/s, the gas flow rate is 8.5L/min, and the joints of the two wax-up connection parts are staggered by 30mm for welding, and both sides of the groove are welded. After melting, fill in the welding wire, and the welding wire should always be under the protection of argon gas, the surrounding environment should be free of wind, and the relative humidity should not be higher than 70%, the arc should not be stopped during the cutting and welding process, the locking part will solidify first, and the pouring pool will solidify after , the key-locking mold shell is obtained after the wax-shaped tree is completed, and the obtained key-locking mold shell is placed in a cleaning agent and immediately dried at high temperature. The cleaning agent is composed of palm alcohol with a mass ratio of 0.3:0.9:100. , sorbitol and water;

S5. Dewaxing film: put the key-locking mould shell after drying in step S4, put it in the electric heating steam dewaxing kettle, pass 0.8MPa steam, and heat it until the wax on the surface of the key-locking mould shell is completely removed, that is, the wax is completed. Mold making process.

Example 3

The wax mold making process for locking keys proposed by the present invention comprises the following steps:

S1, prepare wax mold raw materials: wax mold raw materials, in parts by weight, include 100 parts of rosin resin, 46 parts of ethylene glycol diglycidyl ether, 2 parts of lauroyl diethanolamine, 2.6 parts of trihydroxy polyether, and 0.6 parts of molybdenum disulfide. ;

S2, prepare wax material: put the rosin resin, lauroyl diethanolamine and molybdenum disulfide weighed in step S1 into a reaction flask, add an appropriate amount of ethanol, and stir at a speed of 300r/min for 25min at 70°C, The ethylene glycol diglycidyl ether and trihydroxy polyether weighed in step S1 are added to the reaction flask, the temperature is raised to 105 ° C, the stirring is continued for 2 h, and the wax is obtained by cooling to room temperature;

S3. Making the wax pattern: using the wax material prepared in step S2 as the mold material, a vertical double-station cylinder-free wax injection machine is used to make the wax pattern. The injection pressure is 32kg/cm ² , the temperature is 63° C., and the wax injection The time is 2.5s, the holding time is 5s, and the temperature of the wax box is controlled at 92℃;

S4. Wax-type tree: After heating and melting the connection part of the wax-type with a flat-head electric iron, weld several wax-types together according to the design requirements to obtain the AISI304 locking part, and then connect the AISI304 locking part with the The pouring pool parts are welded together to complete the wax-up tree formation. During the tree formation process, the welding speed is 30mm/s, the gas flow rate is 9L/min, and the joints of the two wax-shaped connection parts are staggered by 31mm for welding. After the side is melted, fill in the welding wire, and the welding wire should always be under the protection of argon gas. The surrounding environment should be free of wind and the relative humidity should not be higher than 70%. The arc cannot be stopped during the cutting and welding process. After solidification, the wax-shaped tree is completed to obtain the key-locking formwork. The obtained key-locking formwork is placed in a cleaning agent and immediately dried at high temperature. The cleaning agent is made of palm with a mass ratio of 0.4:0.6:100 Alcohol, sorbitol and water are compounded;

S5, dewaxing film: put the key-locking mould shell after drying in step S4, put it in the electric heating steam dewaxing kettle, pass 0.9MPa steam, and heat it until the wax on the surface of the key-locking mould shell is completely removed, that is, the wax is completed. Mold making process.

Using the wax molds made in Examples 1 to 3 of the present invention to produce lock keys, the surface finish of the lock keys produced is high, the dimensional accuracy can meet the design requirements of the lock keys, the product quality is high, and the produced lock keys are undamaged The inspection results showed that no defects were found.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (7)

1. be used for the wax mould making process of locking key, is characterized in that, comprises the following steps: S1. Prepare wax mold raw materials: The wax mold raw materials, in parts by weight, include 100 parts of rosin resin, 23 to 46 parts of ethylene glycol diglycidyl ether, 2 to 4 parts of lauroyl diethanolamine, and 1.4 to 2.6 parts of trihydroxy polyether. , 0.2～0.6 parts of molybdenum disulfide; S2, preparation of wax material: put the rosin resin, lauroyl diethanolamine and molybdenum disulfide weighed in step S1 into a reaction flask, add an appropriate amount of ethanol, and under the condition of 60～70℃, at a speed of 200～300r/min Stir for 25-30min, add the ethylene glycol diglycidyl ether and trihydroxy polyether weighed in step S1 into the reaction flask, heat up to 100-105°C, continue stirring for 1-2h, and cool to room temperature to obtain wax; S3, making the wax pattern: using the wax material prepared in step S2 as the mold material, a vertical double-station cylinder-free wax injection machine is used to make the wax pattern, the injection pressure is 28～32kg/cm ² , and the temperature is 63～67 °C; S4. Wax-type tree: After heating and melting the connection part of the wax-type with a flat-head electric iron, weld several wax-types together according to the design requirements to obtain the AISI304 locking part, and then connect the AISI304 locking part with the Parts of the pouring pool are welded together to complete the tree formation. During the tree formation process, the two sides of the groove are melted and filled with welding wire, and the welding wire must always be under the protection of argon gas. The arc cannot be stopped during the cutting and welding process, and the key must be locked. Part of it is solidified first, and part of the pouring pool is solidified, and the key-locking formwork is obtained when the wax-shaped tree is completed; S5. Dewaxing film: place the key-locking mould shell prepared in step S4 in an electric heating steam dewaxing kettle, pass 0.7-0.9MPa steam, and heat until the wax on the surface of the key-locking mould shell is completely removed, that is, Complete the wax mold making process. 2. The process for making a wax mold for locking keys according to claim 1, wherein in step S1, the wax mold raw materials comprise 100 parts of rosin resin, ethylene glycol diglycidyl ether according to parts by weight 34 parts, 3 parts of lauroyl diethanolamine, 2 parts of trihydroxy polyether, 0.4 part of molybdenum disulfide. 3 . The wax mold manufacturing process for locking keys according to claim 1 , wherein when the wax mold is made in step S3 , the wax injection time is 1.5-2.5 s, and the pressure holding time is 1-5 s. 4 . 4 . The wax mold manufacturing process for locking keys according to claim 1 , wherein, when the wax mold is made in step S3, the temperature of the wax box is controlled at 88-92° C. 5 . 5 . The wax mold manufacturing process for locking keys according to claim 1 , wherein in step S4 , the surrounding environment should be windless during the welding operation, and the relative humidity should not be higher than 70%. 6 . 6. The wax mold manufacturing process for locking keys according to claim 1, wherein in step S4, during the welding operation, the welding speed is 20～30mm/s, the gas flow rate is 8～9L/min, and The joints of the two wax-shaped connection parts are staggered by 29-31mm for welding. 7. The wax model manufacturing process for locking keys according to claim 1, wherein the wax-type tree of step S4 also includes post-processing operations, and the concrete steps of the post-processing operations are: to make The key-locking mould shell is placed in a cleaning agent and immediately dried at high temperature after being cleaned.