Manufacturing method of automobile front wall sound insulation pad capable of reducing odor

Abstract

The invention relates to a manufacturing method of an automobile front wall sound insulation pad capable of reducing odor. The raw material particles are subjected to injection molding to form a heavy layer body, the injection molding temperature and time are recorded, the temperature and the injection molding time are adjusted until the odor index of the heavy layer body meets a preset odor index, the heavy layer body meeting the index is obtained, and the injection molding temperature and time are recorded; putting the heavy layer body into a foaming mold, filling a proportioning material meeting a preset odor index, adjusting the temperature and the proportion until a foamed and molded semi-finished product meets the preset odor index to obtain a sound insulation pad semi-finished product meeting the index, and recording the temperature and the proportion; and performing subsequent processing on the obtained semi-finished product of the sound insulation pad to obtain the automobile front wall sound insulation pad capable of reducing odor. Compared with the prior art, the temperature sensor is additionally arranged on conventional equipment, equipment does not need to be developed again, the equipment can be put into production, technological parameter changes caused by changes of production environment factors can be reduced, and the production qualification rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of automobile sound insulation pad manufacturing, in particular to a method for manufacturing an automobile front wall sound insulation pad capable of reducing odor. Background Art

[0002] The car's front sound insulation pad is one of the parts on the car. It is installed between the cockpit and the engine compartment. One of its functions is to block the engine noise from entering the cockpit during driving, reduce noise and improve driving comfort.

[0003] The car's front wall sound insulation pad is composed of PU raw material particles, polyether polyol, isocyanate, catalyst, formaldehyde remover, release agent and PET sound-absorbing cotton. It needs to be processed through multiple processes such as hot processing and cold processing. The raw material particles are baked at the specified temperature and time, and the injection mold is developed according to the shape and structure of the product. The injection molding equipment sets the temperature of each section, and after a certain period of injection, it becomes a heavy layer skin. The heavy layer skin is in the foaming mold, mixed with a certain proportion of polyether polyol F3135, crosslinker DE0A, polyether polyol 350D, catalyst THN-03, catalyst THN-04, silicone oil stabilizer DC6080, silicone oil stabilizer L-3415, additive AS102, water and color paste PA-8009-94, and the ratio of isocyanate 8001 raw material is A material and B material, sprayed with an appropriate amount of release agent, foamed and molded into one, and then the edges are trimmed, the sound-absorbing cotton is nailed, and baked to reduce VOC, and the car's front wall sound insulation pad is completed.

[0004] The car's front wall sound insulation pad is a kind of material composite, which belongs to the composite range of chemical raw materials and various additives, and is widely used in automobile parts. At present, the composite methods at home and abroad are mainly hot processing and cold processing. Chemical raw material hot compounding is a process of modifying the molecular structure of chemical raw materials. This process will produce the smell of chemical raw materials, so that the manufactured products emit odor. The raw material particles are baked at a specified temperature for a certain time and enter the injection molding machine barrel. They automatically enter the 5-stage screw of the injection molding machine through the barrel. The temperature of the screw decomposes the raw material particles at high temperature and injects them into the injection mold for molding. The injection molding time is specified to produce a heavy layer blank, which is defined as heavy layer injection molding in this article. The raw material particles are matured at high temperature in the screw. Excessive temperature causes the chemical raw materials to produce odor, and too low temperature causes the heavy layer to be unqualified. The length of the injection molding time causes the heavy layer to have flash or defects, low pass rate and excessive odor.

[0005] Therefore, it is urgent to study a method for manufacturing a car sound insulation pad that can reduce the odor of the car sound insulation pad. Summary of the invention

[0006] The purpose of the present invention is to provide a method for manufacturing a car front wall sound insulation pad with reduced odor in order to overcome the defects of the above-mentioned prior art. By adding a temperature sensor to conventional equipment, there is no need to re-develop the equipment, and it can also reduce the changes in process parameters caused by changes in production environment factors and improve the production qualification rate.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention provides a method for manufacturing an automobile front wall sound insulation pad for reducing odor, comprising the following steps:

[0009] S1: Injection molding the raw material particles into a heavy layer body, and record the screw temperature parameters and injection molding time during injection molding, detect the odor index of the heavy layer body after solidification, adjust the temperature and injection molding time until the odor index of the heavy layer body meets the preset odor index, obtain a heavy layer body that meets the index, and record the injection molding temperature and time;

[0010] S2: Put the heavy layer body that meets the index in S1 into the foaming mold, and fill it with the proportion material that meets the preset odor index, adjust the temperature and proportion until the semi-finished product after foaming meets the preset odor index, obtain the semi-finished sound insulation pad that meets the index, and record the temperature and proportion;

[0011] S3: The semi-finished sound insulation pad obtained in S2 is subsequently processed to obtain a car front sound insulation pad with reduced odor, and the injection temperature and time recorded in S1 and the foaming temperature and ratio data recorded in S2 are input into the external platform monitoring system to realize mass production of car front sound insulation pads with reduced odor.

[0012] Furthermore, in S1 and S2, the preset odor index is an odor index less than 3.5.

[0013] Furthermore, in S2, the proportioned materials include material A and material B, and the material A includes polyether polyol 330N, polymer polyol H45, ammonia catalyst NP15, saddle catalyst C-225, triethanolamine TEA, silicone oil stabilizer DC6080, and distilled water.

[0014] Furthermore, the B material includes isocyanate 44V20 and isocyanate T-80.

[0015] Furthermore, the filling mass ratio of the A material to the B material is 100:38.

[0016] Furthermore, in S1 and S2, a temperature sensor is used to record the injection temperature and the foaming temperature.

[0017] Furthermore, the temperature sensor is connected to the injection molding screw.

[0018] Furthermore, a VOC detector is used to detect odor.

[0019] Furthermore, in S3, the specific process of the subsequent processing is: trimming the edges of the semi-finished sound insulation pad obtained in S2, stapling the sound-absorbing cotton, and baking to obtain the car front wall sound insulation pad with reduced odor.

[0020] Furthermore, in S3, the external platform monitoring system automatically determines whether the injection temperature, time, foaming temperature and ratio data are within a preset range, and issues an alarm if they exceed the preset range.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. The present invention adds a temperature sensor to conventional equipment, and can be put into production immediately without the need to redevelop the equipment; in addition, the present invention can reduce the changes in process parameters caused by changes in production environment factors, improve the production qualification rate, and can also quickly understand the on-site conditions of product production and adjust production parameters in time.

[0023] 2. The data produced by the present invention is convenient for statistics, and the production factors of the products can be traced back at any time to analyze the product quality. In addition, the present invention can also reduce frequent trial production and reduce trial production costs. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present invention are described in detail below through examples. These examples are implemented on the premise of the scheme described in the present invention, and provide detailed implementation methods and specific operating processes, but the protection scope of the present invention is not limited to the following examples.

[0025] The present invention is further described below in conjunction with specific embodiments. Any features such as component models, material names, connection structures, preparation methods, materials, structures or composition ratios not clearly described in this technical solution are deemed to be common technical features disclosed in the prior art.

[0026] Example 1

[0027] This embodiment provides a method for manufacturing an odor-reducing automobile front wall sound insulation pad, comprising the following steps:

[0028] S1: Connect the temperature sensor to the screw in the injection molding equipment, inject the raw material particles into a heavy layer, and record the screw temperature parameters and injection time during injection molding. After solidification, detect the odor index of the heavy layer, adjust the temperature and injection time until the odor index of the heavy layer meets the preset odor index, obtain a heavy layer that meets the index, and record the injection temperature and time, and use the normal distribution method to set the range as the system standard parameters. Parameter collection is shown in Table 1.

[0029] Table 1 Temperature record of injection molding screw

[0030] Screw 1 Screw 2 Screw 3 Screw 4 Screw 5 temperature 215±10℃ 220±10℃ 215±10℃ 210±10℃ 190±10℃

[0031] The injection molding time is 110±5 seconds.

[0032] S2: Place the heavy layer body that meets the index in S1 into the foaming mold, and fill it with the proportioned materials that meet the preset odor index, namely material A and material B, wherein the material A includes polyether polyol 330N, polymer polyol H45, ammonia catalyst NP15, saddle catalyst C-225, triethanolamine TEA, silicone oil stabilizer DC6080, and distilled water. The material B includes isocyanate 44V20 and isocyanate T-80; the proportion for preparing the foaming layer is the existing technology and meets the requirements of JT265-2010, which will not be repeated here. The temperature sensor is connected to the external computer for communication, and the temperature and proportion are adjusted until the semi-finished product after foaming meets the preset odor index, and the semi-finished sound insulation pad that meets the index is obtained, and the temperature and proportion are recorded. The foaming ratio parameters are shown in Table 2.

[0033] Table 2 Ingredient ratio of material A and material B

[0034] Material A B material Ratio 100 38±2

[0035] The equipment parameter values ​​are shown in Table 3.

[0036] Table 3 Temperature table of material A, material B and foaming mold

[0037] Material A B material Foaming mold temperature 35±5℃ 25±5℃ 95±10℃

[0038] S3: The semi-finished sound insulation pad obtained in S2 is subsequently processed to obtain a car front sound insulation pad with reduced odor, a wireless network is deployed in the workshop, and the injection temperature and time recorded in S1, and the foaming temperature and ratio data recorded in S2 are input into the external platform monitoring system. The external platform monitoring system automatically determines whether the data meets the preset range according to the designed program, and issues an alarm if it exceeds the preset range, and adjusts the parameters to realize mass production of car front sound insulation pads with reduced odor.

[0039] The wireless network is based on industrial communication protocols such as industrial Ethernet and industrial bus, general protocols such as Ethernet and optical fiber, and wireless protocols such as WIFI, 4G, and NB-IOT to connect industrial field equipment to the platform edge layer. The types of equipment supported by the platform edge layer include: various sensors, robots, CNC machine tools, PLCs, embedded control systems, intelligent equipment, industrial computers, etc. Support protocol analysis: The edge computing terminal can support industrial communication protocols and Internet of Things protocols compatible with Modbus-RTU, Modbus-TCP, and MQTT, and can realize data collection of various types of equipment such as production equipment, devices, and industrial products in different industries.

[0040] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for manufacturing an odor-reducing automobile front wall sound insulation pad, characterized in that: The following steps are involved: S1: Injection molding the raw material particles into a heavy layer body, and record the screw temperature parameters and injection molding time during injection molding, detect the odor index of the heavy layer body after solidification, adjust the temperature and injection molding time until the odor index of the heavy layer body meets the preset odor index, obtain a heavy layer body that meets the index, and record the injection molding temperature and time; S2: Put the heavy layer body that meets the index in S1 into the foaming mold, and fill it with the proportion material that meets the preset odor index, adjust the temperature and proportion until the semi-finished product after foaming meets the preset odor index, obtain the semi-finished sound insulation pad that meets the index, and record the temperature and proportion; S3: The semi-finished sound insulation pad obtained in S2 is subsequently processed to obtain a car front sound insulation pad with reduced odor, and the injection temperature and time recorded in S1 and the foaming temperature and ratio data recorded in S2 are input into the external platform monitoring system to realize mass production of car front sound insulation pads with reduced odor.

2. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: In S1 and S2, the preset odor index is an odor index less than 3.

5.

3. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: In S2, the proportioned materials include material A and material B, and the material A includes polyether polyol 330N, polymer polyol H45, ammonia catalyst NP15, saddle catalyst C-225, triethanolamine TEA, silicone oil stabilizer DC6080, and distilled water.

4. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 3, characterized in that: The B material includes isocyanate 44V20 and isocyanate T-80.

5. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 3, characterized in that: The filling mass ratio of the A material to the B material is 100:

38.

6. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: In S1 and S2, temperature sensors are used to record the injection temperature and foaming temperature.

7. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 6, characterized in that: The temperature sensor is connected to the injection molding screw.

8. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: Use a VOC detector to detect odors.

9. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: In S3, the specific process of the subsequent processing is: trimming the edges of the semi-finished sound insulation pad obtained in S2, nailing the sound-absorbing cotton, and baking to obtain the car front wall sound insulation pad with reduced odor.

10. The method for manufacturing an odor-reducing automobile front wall sound insulation pad according to claim 1, characterized in that: In S3, the external platform monitoring system automatically determines whether the injection temperature, time, foaming temperature and ratio data are within the preset range, and issues an alarm if they are beyond the preset range.