阅读说明：本技术 一种用于锁键的蜡模制作工艺 (Wax mold manufacturing process for locking key ) 是由 董晟全 高云鹏 王睿仪 何子博 梁艳峰 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种用锁键的蜡模制作工艺,包括以下步骤：S1、准备蜡模原料包括松香树脂、乙二醇二缩水甘油醚、月桂酰二乙醇胺、三羟基聚醚、二硫化钼；S2、将松香树脂、月桂酰二乙醇胺、二硫化钼与适量的乙醇搅拌后,加入乙二醇二缩水甘油醚和三羟基聚醚,升温搅拌即得蜡料；S3、以蜡料为模料,进行蜡型的制作；S4、用平头型电洛铁将蜡型进行组树,即得锁键模壳；S5、将锁键模壳置于电热蒸汽脱蜡釜中,通入蒸汽至锁键模壳表面的蜡质去除完全,即完成蜡模制作工艺。本发明提出的蜡模制作工艺,简单易行,制得的蜡模能够应用于生产高尺寸精度、高表面光洁度的锁键。(The invention discloses a wax mould manufacturing process using a locking key, which comprises the following steps: s1, preparing wax mould raw materials including rosin resin, ethylene glycol diglycidyl ether, lauroyl diethanol amine, trihydroxy polyether and molybdenum disulfide; s2, stirring the rosin resin, the lauroyl diethanol amine, the molybdenum disulfide and a proper amount of ethanol, adding the ethylene glycol diglycidyl ether and the trihydroxy polyether, heating and stirring to obtain a wax material; s3, taking wax as a mould material, and manufacturing a wax model; s4, using flat-head electric iron to group the wax pattern into a tree, and obtaining a locking mould shell; s5, placing the locking mould shell in an electric heating steam dewaxing kettle, and introducing steam until the wax on the surface of the locking mould shell is completely removed, thus finishing the wax mould manufacturing process. The wax mould manufacturing process provided by the invention is simple and feasible, and the manufactured wax mould can be applied to producing the lock key with high dimensional precision and high surface finish.)

1. The wax mold manufacturing process for the locking key is characterized by comprising the following steps of:

s1, preparing a wax mould raw material: the wax mold raw materials comprise, by weight, 100 parts of rosin resin, 23-46 parts of ethylene glycol diglycidyl ether, 2-4 parts of lauroyl diethanol amine, 1.4-2.6 parts of trihydroxy polyether and 0.2-0.6 part of molybdenum disulfide;

s2, preparing wax materials: placing the rosin resin, the lauroyl diethanol amine and the molybdenum disulfide weighed in the step S1 into a reaction bottle, adding a proper amount of ethanol, stirring at the speed of 200-300 r/min for 25-30 min at the temperature of 60-70 ℃, adding the ethylene glycol diglycidyl ether and the trihydroxy polyether weighed in the step S1 into the reaction bottle, heating to 100-105 ℃, continuously stirring for 1-2 h, and cooling to room temperature to obtain a wax material;

s3, making a wax pattern: taking the wax material prepared in the step S2 as a mold material, and manufacturing a wax pattern by adopting a vertical double-station cylinder-free wax injection machine, wherein the injection pressure is 28-32 kg/cm²The temperature is 63-67 ℃;

s4, wax type tree group: heating and melting the connecting part of the wax patterns by using flat head type electric ferroalloy, welding a plurality of wax patterns together according to design requirements to obtain an AISI304 locking key part, then welding the AISI304 locking key part and a pouring basin part together to finish wax pattern tree assembly, and in the tree assembly process, melting two sides of a groove and filling welding wires, wherein the welding wires are always under the protection of argon gas, arc can not be stopped in the cutting and welding process, the locking key part is solidified first, the pouring basin part is solidified, and the wax pattern tree assembly is finished to obtain a locking key formwork;

s5, dewaxing film: and (5) placing the locking mould shell prepared in the step (S4) in an electric heating steam dewaxing kettle, introducing 0.7-0.9 MPa of steam, and heating until the wax on the surface of the locking mould shell is completely removed, thus completing the wax mould manufacturing process.

2. The process for manufacturing a wax mold for a locking key according to claim 1, wherein in step S1, the wax mold raw materials comprise, by weight, 100 parts of rosin resin, 34 parts of ethylene glycol diglycidyl ether, 3 parts of lauroyl diethanolamine, 2 parts of trihydroxy polyether, and 0.4 part of molybdenum disulfide.

3. The process of claim 1, wherein the wax injection time is 1.5 to 2.5S and the pressure holding time is 1 to 5S when the wax pattern is manufactured in step S3.

4. The wax mold manufacturing process for the locking key according to claim 1, wherein the temperature of the wax box is controlled to be 88-92 ℃ when the wax pattern is manufactured in the step S3.

5. The wax pattern manufacturing process for a locking key according to claim 1, wherein in step S4, the surrounding environment is free of wind and the relative humidity is not higher than 70% during the welding operation.

6. The wax pattern manufacturing process for the locking key according to claim 1, wherein in the step S4, during the welding operation, the welding speed is 20-30 mm/S, the gas flow rate is 8-9L/min, and the joint of the two wax-type connecting parts is welded by staggering 29-31 mm.

7. The wax pattern manufacturing process for the locking key according to claim 1, wherein the wax pattern tree of step S4 further comprises a post-processing operation, and the post-processing operation comprises the following specific steps: the prepared latch mould shell is placed in a cleaning agent for cleaning and then immediately dried at high temperature, and the cleaning agent is formed by compounding palm alcohol, sorbitol and water according to the mass ratio of 0.2-0.4: 0.6-1.2: 100.

Technical Field

The invention relates to the technical field of investment casting, in particular to a wax mold manufacturing process for a locking key.

Background

The lock key is one of common auxiliary accessories on the device, and is widely applied to the fields of automobiles, mechanical equipment and the like. With the continuous development of technology in recent years, the usage rate of automobile and mechanical products is increasing, so that the demand of the lock key is remarkably increased. At present, the key is mainly produced by investment casting in factories. The wax pattern is the most important auxiliary material in investment casting, and one wax pattern is needed for producing each group of castings, so that the quality of the wax pattern directly influences the size and the surface finish of the castings. In order to obtain high-quality castings, a lot of efforts are put into the field of wax mould manufacturing by a plurality of researchers at home and abroad, and although the quality of the wax mould is improved, the method still has some defects, such as low dimensional accuracy of a lock key produced by using the existing wax mould, unsatisfactory surface smoothness of the lock key and the like. Based on the defects in the prior art, the invention provides a wax mould manufacturing process for a locking key.

Disclosure of Invention

The invention aims to solve the problems of low dimensional precision, non-ideal surface smoothness of a lock key and low quality of the lock key product when the lock key is produced by using the conventional wax mould, and provides a wax mould manufacturing process for the lock key.

The wax mold manufacturing process for the locking key comprises the following steps:

s1, preparing a wax mould raw material: the wax mold raw materials comprise, by weight, 100 parts of rosin resin, 23-46 parts of ethylene glycol diglycidyl ether, 2-4 parts of lauroyl diethanol amine, 1.4-2.6 parts of trihydroxy polyether and 0.2-0.6 part of molybdenum disulfide;

s2, preparing wax materials: placing the rosin resin, the lauroyl diethanol amine and the molybdenum disulfide weighed in the step S1 into a reaction bottle, adding a proper amount of ethanol, stirring at the speed of 200-300 r/min for 25-30 min at the temperature of 60-70 ℃, adding the ethylene glycol diglycidyl ether and the trihydroxy polyether weighed in the step S1 into the reaction bottle, heating to 100-105 ℃, continuously stirring for 1-2 h, and cooling to room temperature to obtain a wax material;

s3, making a wax pattern: taking the wax material prepared in the step S2 as a mold material, and manufacturing a wax pattern by adopting a vertical double-station cylinder-free wax injection machine, wherein the injection pressure is 28-32 kg/cm²The temperature is 63-67 DEG C；

S4, wax type tree group: heating and melting the connecting part of the wax patterns by using flat head type electric ferroalloy, welding a plurality of wax patterns together according to design requirements to obtain a locking key part, welding the locking key part and a watering part together to finish wax pattern tree assembly, melting two sides of a groove and then filling welding wires in the tree assembly process, wherein the welding wires are always under the protection of argon gas, arc can not be stopped in the cutting and welding process, the locking key part is solidified firstly, the watering part is solidified, and the wax pattern tree assembly is finished to obtain a locking key mould shell;

s5, dewaxing film: and (5) placing the locking mould shell prepared in the step (S4) in an electric heating steam dewaxing kettle, introducing 0.7-0.9 MPa of steam, and heating until the wax on the surface of the locking mould shell is completely removed, thus completing the wax mould manufacturing process.

Preferably, in step S1, the wax pattern raw material includes, by weight, 100 parts of rosin resin, 34 parts of ethylene glycol diglycidyl ether, 3 parts of lauroyl diethanolamine, 2 parts of trihydroxy polyether, and 0.4 part of molybdenum disulfide.

Preferably, when the wax pattern is manufactured in step S3, the wax injection time is 1.5 to 2.5S, and the pressure holding time is 1 to 5S.

Preferably, when the wax pattern is manufactured in step S3, the temperature of the wax box is controlled to 88-92 ℃.

Preferably, in step S4, the ambient environment should be free of wind during the welding operation and the relative humidity is not higher than 70%.

Preferably, in step S4, during the welding operation, the welding speed is 20-30 mm/S, the gas flow rate is 8-9L/min, and the joint of the two wax-shaped connecting parts is welded by staggering 29-31 mm.

Preferably, the wax-type tree set of step S4 further includes a post-processing operation, and the post-processing operation includes the specific steps of: the prepared latch mould shell is placed in a cleaning agent for cleaning and then immediately dried at high temperature, and the cleaning agent is formed by compounding palm alcohol, sorbitol and water according to the mass ratio of 0.2-0.4: 0.6-1.2: 100.

Compared with the prior art, the invention has the beneficial effects that:

1. the wax mould manufacturing process provided by the invention is simple and easy to implement, the equipment is conventional, the manufacturing cost is low, the high-quality wax mould can be manufactured by matching the processes of preparing the wax mould raw material, preparing the wax material, manufacturing the wax pattern, assembling the wax pattern into a tree and dewaxing the film, in particular, the lock key can be manufactured, the manufactured lock key has high dimensional precision and good surface smoothness, and the problems of low dimensional precision, non-ideal surface smoothness and low quality of the lock key product of the produced lock key when the lock key is produced by using the existing wax mould are effectively solved;

2. the wax material used in the wax mould manufacturing process is prepared from rosin resin, ethylene glycol diglycidyl ether, lauroyl diethanol amine, trihydroxy polyether and molybdenum disulfide according to a reasonable proportion, has excellent processing formability, and ensures that the manufactured wax mould has high precision and high surface finish by controlling the injection pressure and temperature of the wax material, the wax injection and pressure maintaining time, the temperature of a wax box, the sequence of wax pattern tree combination and the welding method, thereby ensuring that the size precision of the lock key produced by the wax mould meets the requirement, and the wax mould manufactured by the wax mould manufacturing process has high product qualification rate, smooth product surface and high quality.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.