CN110640996A - Automobile ceiling production line and heating method - Google Patents

Abstract

The invention provides an automobile ceiling production line and a heating method, wherein the production line sequentially comprises an automatic conveying system, a heating furnace, a compression molding machine, a fabric spreading and conveying device, a cutting device and an accessory assembly table, wherein the heating furnace is formed by connecting a plurality of heating furnaces in series, a plurality of temperature control areas are arranged on the heating furnace, and a main control box and a temperature control table which are used for independently controlling each temperature control area are arranged on the heating furnace. By using the automobile ceiling production line and the heating method, the product quality is greatly improved, and the waste loss rate is reduced to 0.3% from the original 2.1%; meanwhile, the productivity of the equipment is increased, the production efficiency is greatly improved, and the production capacity is increased to 420 pieces from the original 250 pieces.

Description

Automobile ceiling production line and heating method

Technical Field

The invention relates to processing of an automobile ceiling fabric, in particular to an automobile ceiling production line and a heating method.

Background

Traditional ceiling production line adopts traditional single stove, single timber far infrared heating, integral temperature regulation equipment basically, has following drawback:

1. the heating time (75-85S) of a single furnace and a single sheet is longer than the self pressure maintaining time (50-60S) required by the product, and the production efficiency and the productivity are seriously influenced;

2. temperature zones at two sides and front and rear ends of a furnace body are difficult to adjust (fast heat dissipation), because the inlet and outlet of a PU sheet into and out of the heating furnace are not totally closed, heat at the front and rear sides is partially dissipated, and then air flow in the furnace can cause uneven heat distribution (higher middle temperature and lower two sides), so that the heating temperature of some zones of the PU sheet cannot reach a required value;

3. according to the modeling characteristics of the product and the thermoplastic material characteristics of the PU sheet, the different temperature requirements of the stretching ratio of each area of the sheet are different when the product is molded, and the areas with steeper modeling surfaces are as follows: the required temperature values of the A/C column and the front dome lamp sheet are high, the required temperature values of the areas with smooth shapes, such as the middle part of a ceiling, can be slightly low, and the temperature regulation of the traditional equipment can not meet the different temperature requirements of each area;

the product quality defect of the conventional heating device due to the influence of the heating temperature is also fatal:

the formed ceiling is easy to rebound and deform and collapse under high-temperature exposure;

the adhesive film on the surface of the sheet is not completely melted, so that virtual adhesion is generated between the fabric and the sheet, and the fabric and the sheet are layered after water cutting;

the sheet is not completely baked, so that the ceiling surface has unevenness such as pits and pits.

Disclosure of Invention

The invention aims to provide an automobile ceiling production line and a heating method, which can reduce heating time and improve production efficiency on the premise of ensuring uniform heating of a PU plate.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides a car roof production line, the production line comprises automatic conveying system, heating furnace, compression molding machine, surface fabric shop send device, cutting device, annex mount table in proper order, its characterized in that: the heating furnace is characterized in that the heating furnaces are connected in series, a plurality of temperature control areas are arranged on the heating furnace, and a main control box and a temperature control table which are independently controlled aiming at each temperature control area are arranged on the heating furnace.

The improvement of the technical scheme is as follows: the number of the heating furnaces on the production line is two.

The technical scheme is further improved as follows: and 24 temperature control areas are arranged on the heating furnace.

A heating method of an automobile ceiling comprises the following steps:

1) laying the sheet on an automatic conveying system, conveying the sheet to a first heating furnace for preheating, and then conveying the sheet to a second heating furnace for reheating;

2) feeding the reheated sheet into a press, simultaneously feeding the fabric into the press, and carrying out pressure molding;

3) performing high-pressure water cutting on the pressurized and formed fabric;

4) and assembling the accessory to obtain a finished product.

Has the advantages that:

according to the automobile ceiling production line and the heating method, two infrared radiation heating furnaces are connected in series on the ceiling production line and are divided into a first-stage furnace and a second-stage furnace, two sheets are always heated simultaneously in the furnaces, and each sheet is preheated once, so that the sheet heating time is greatly shortened, and the production efficiency is improved. In addition, a subarea temperature control technology is adopted, each heating plate is divided into 24 temperature control areas, and the temperature of the heating block of each temperature control area can be independently set, so that selective and targeted heating of different areas of the sheet is realized, the finer the temperature control area division is, the higher the temperature control precision is, and the temperature control area layout is.

By using the automobile ceiling production line and the heating method, the product quality is greatly improved, and the waste loss rate is reduced to 0.3% from the original 2.1%; meanwhile, the productivity of the equipment is increased, the production efficiency is greatly improved, and the production capacity is increased to 420 pieces from the original 250 pieces.

Drawings

FIG. 1 is a flow chart of a conventional production process.

FIG. 2 is a process flow diagram of the present invention.

FIG. 3 is a comparison of heating performance of a single-piece heating apparatus and a two-piece simultaneous zone heating apparatus.

Figure 4 product climate cycle, rigidity test results.

FIG. 5 shows the results of peel strength tests on products.

FIG. 6 is a comparison table of 6 single furnace heating and two furnace zone heating.

Detailed Description

Two infrared radiation heating furnaces are connected in series on a ceiling forming line to form a double-furnace-in-one structure, so that two sheets are heated simultaneously in a furnace body all the time, each sheet is preheated once, the heating time of the sheets is doubled under the condition that the original production beat is not changed, and the problem that the heating time of PU sheets is insufficient is solved;

by adopting a zone temperature control technology, each heating plate is divided into 24 temperature control zones, and the temperature of the heating block of each temperature control zone can be independently set, so that different zones of the sheet can be selectively and pertinently heated, and the thinner the temperature control zone is, the higher the temperature control precision is;

after the technology of heating two sheets in different zones simultaneously is adopted, the heating temperature of the PU sheet is well distributed stably, and real-time data statistics measured by temperature measuring equipment is shown in figure 3;

after the double-sheet simultaneous zone heating technology is adopted for production, the problems of roof collapse, product layering, uneven surface and the like are also improved, the performance (climate cycle, rigidity and peeling strength) of products which directly affect the quality problems can meet the requirements through the sampling test of batch pieces, and the test results are shown in fig. 4 and 5;

the advantages of the two-sheet simultaneous zone furnace compared to the one-sheet furnace, both in terms of quality and efficiency, are evident, the comparison is shown in table 6.

The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.

Claims (4)

1. The utility model provides a car roof production line, the production line comprises automatic conveying system, heating furnace, compression molding machine, surface fabric shop send device, cutting device, annex mount table in proper order, its characterized in that: the heating furnace is characterized in that the heating furnaces are connected in series, a plurality of temperature control areas are arranged on the heating furnace, and a main control box and a temperature control table which are independently controlled aiming at each temperature control area are arranged on the heating furnace.

2. The automotive ceiling production line of claim 1, characterized in that: the number of the heating furnaces on the production line is two.

3. The automotive ceiling production line according to claim 1 or 2, characterized in that: and 24 temperature control areas are arranged on the heating furnace.

4. A heating method of an automobile ceiling comprises the following steps:

1) laying the sheet on an automatic conveying system, conveying the sheet to a first heating furnace for preheating, and then conveying the sheet to a second heating furnace for reheating;

2) feeding the reheated sheet into a press, simultaneously feeding the fabric into the press, and carrying out pressure molding;

3) performing high-pressure water cutting on the pressurized and formed fabric;

4) and assembling the accessory to obtain a finished product.

Images