CN112123669A

CN112123669A - Mold structure and mold pressing method

Info

Publication number: CN112123669A
Application number: CN202010928622.6A
Authority: CN
Inventors: 钟广亮; 赵海英; 曹慧林; 李雪
Original assignee: BAIC Group ORV Co ltd
Current assignee: BAIC Group ORV Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2020-12-25
Anticipated expiration: 2040-09-07
Also published as: CN112123669B

Abstract

The invention provides a mould structure and a mould pressing method, wherein the mould structure comprises: the device comprises an upper die and a lower die which are arranged oppositely, wherein a forming cavity for accommodating a part to be formed is formed between the upper die and the lower die; the vacuum pump is used for exhausting gas in the part to be molded; the vacuum groove is arranged in the upper die and the lower die, one end of the vacuum groove is connected with the forming cavity, and the other end of the vacuum groove is connected with the vacuum pump. According to the scheme of the invention, the vacuum pump for exhausting the gas in the part to be molded is arranged, so that the effect of exhausting VOC substances and odor of parts in the automobile can be achieved simultaneously in the molding process, the exhausting efficiency is improved, and the cost is reduced.

Description

Mold structure and mold pressing method

Technical Field

The invention relates to the technical field of automobile part processing and manufacturing, in particular to a die structure and a die pressing method.

Background

Due to the environmental and health requirements, the quality of air in automobiles is becoming more and more concerned, and Volatile Organic Compounds (VOC) in automobiles are a main source of air pollution in automobiles. The interior materials of automobiles comprise single materials such as genuine leather, fabrics, rubber and plastics or laminated composite materials such as seat fabrics and linings, instrument panels, floor coverings, interior trim panels, roof linings and the like, and additives, flame retardants, paints, coating materials and the like used in the manufacturing process volatilize VOC substances and odors during the use process, and the VOC substances and odors of parts are removed, so that the important way for improving the air quality in the automobiles is provided.

Disclosure of Invention

The embodiment of the invention provides a die structure and a die pressing method, which are used for solving the problems of low removal efficiency and high cost of VOC substances and odor of parts in a vehicle in the prior art.

In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:

one embodiment of the present invention provides a mold structure, including:

the device comprises an upper die and a lower die which are arranged oppositely, wherein a forming cavity for accommodating a part to be formed is formed between the upper die and the lower die;

the vacuum pump is used for exhausting gas in the part to be molded;

the vacuum groove is arranged in the upper die and the lower die, one end of the vacuum groove is connected with the forming cavity, and the other end of the vacuum groove is connected with the vacuum pump.

Optionally, the upper mold is formed with a first protrusion toward the lower mold; the lower die is provided with a second bulge towards the upper die;

the first bulge is connected with the second bulge in a matched mode.

Optionally, the upper mold and the lower mold have a gap after being closed.

Optionally, the number of the vacuum grooves is plural.

Optionally, an orthographic projection of the vacuum groove in the upper mold on the plane where the part to be molded is located does not overlap with an orthographic projection of the vacuum groove in the lower mold on the plane where the part to be molded is located.

Optionally, the vacuum pump is for applying a negative vacuum pressure and/or a positive pressure to the forming cavity.

The embodiment of the invention also provides a die pressing method applied to the die structure, and the method comprises the following steps:

placing the upper die, the lower die and/or the part to be molded in a molding heating system for heating;

placing the part to be molded into the upper mold and the lower mold, and performing mold closing molding; and starting the vacuum pump, controlling the pressure in the molding cavity to reach a set threshold value, and maintaining the pressure for a set time.

Optionally, the controlling the pressure in the molding cavity to a set threshold and maintaining the pressure in the molding cavity for a set time includes:

applying vacuum negative pressure to the forming cavity to the set threshold and maintaining the set time; or the like, or, alternatively,

after positive pressure is applied to the vacuum cavity, negative vacuum pressure is applied to the set threshold and the set time is maintained; or the like, or, alternatively,

and applying positive pressure and vacuum negative pressure to the vacuum cavity alternately, and alternately setting times.

Optionally, the method further comprises:

and (3) decompressing the vacuum pump, opening the upper die and the lower die, and demolding the molded part.

The invention has the beneficial effects that:

the present invention provides a mold structure comprising: the device comprises an upper die and a lower die which are arranged oppositely, wherein a forming cavity for accommodating a part to be formed is formed between the upper die and the lower die; the vacuum pump is used for exhausting gas in the part to be molded; the vacuum groove is arranged in the upper die and the lower die, one end of the vacuum groove is connected with the forming cavity, and the other end of the vacuum groove is connected with the vacuum pump. According to the scheme of the invention, the vacuum pump for exhausting the gas in the part to be molded is arranged, so that the effect of exhausting VOC substances and odor of parts in the automobile can be achieved simultaneously in the molding process, the exhausting efficiency is improved, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a mold structure provided by an embodiment of the present invention;

FIG. 2 is a flow chart of an embossing method according to an embodiment of the present invention.

Description of reference numerals:

1, mounting a mold; 2-lower mould; 3-a vacuum pump; 4-vacuum tank; 5-a first projection; 6-second projection.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a die structure and a die pressing method aiming at the problems of low removal efficiency and high cost of VOC substances and odor of parts in a vehicle.

As shown in fig. 1, one embodiment of the present invention provides a mold structure, including:

the forming die comprises an upper die 1 and a lower die 2 which are arranged oppositely, wherein a forming cavity for accommodating a part to be formed is formed between the upper die 1 and the lower die 2;

a vacuum pump 3 for exhausting gas from the part to be molded;

and the vacuum groove 4 is arranged in the upper die 1 and the lower die 2, one end of the vacuum groove 4 is connected with the forming cavity, and the other end of the vacuum groove 4 is connected with the vacuum pump 3.

It should be noted that, in the prior art, in order to reduce the VOC materials and odor of the interior components, in addition to selecting lower emission materials and controlling the forming temperature and time, increasing the heating time, assisting the increase of the baking procedure, and ventilating the components are very important methods for improving the VOC materials and odor of the interior components. However, the heating time is increased, the baking procedure is increased in an auxiliary manner, extra processes, equipment and cycle investment are required for ventilating the parts, the effect is relatively general, a set of vacuum chamber equipment needs to be developed independently, and a heating and vacuumizing process is required to be added in the production process. Which increases the cost and man-hour and causes premature aging of the parts.

According to the mold structure provided by the invention, the compression molding process is combined with vacuum removal of VOC substances and odor, so that two functions can be simultaneously realized in one link, the compression molding process in the manufacturing process is fully utilized, the removal efficiency of the VOC substances and odor can be improved, the production cost is reduced, the process steps are reduced, the production time is saved, and the effect of removing the VOC substances and odor of parts in a vehicle can be improved.

The upper die 1 is provided with a first bulge facing the lower die 2; the lower mold 2 is formed with a second protrusion 5 toward the upper mold 1;

the first bulge body 5 is connected with the second bulge body 6 in a matching mode.

It should be noted that, go up mould 1 orientation the bed die 2 is formed with first protrusion 5, the bed die orientation the last mould is formed with second protrusion 6, first protrusion 5 with second protrusion 6 cooperation is connected, has formed the shape that is used for the holding to treat the shaping chamber of shaping part, simultaneously through adjusting first protrusion 5 with the shape and the position of second protrusion 6, confirm the shape that is used for the holding to treat the shaping chamber of shaping part to and decided the shaping shape of treating the shaping part.

And a gap is formed between the upper die 1 and the lower die 2 after the dies are closed.

It should be noted that the upper mold 1 and the lower mold 2 are not completely closed after being closed, and the gap is a molding cavity.

The number of the vacuum grooves 4 is plural.

The orthographic projection of the vacuum groove 4 in the upper die 1 on the plane of the part to be molded is not overlapped with the orthographic projection of the vacuum groove 4 in the lower die 2 on the plane of the part to be molded.

It should be noted that, in order to achieve better effect of eliminating VOC substances and odor of parts, a plurality of vacuum grooves 4 are provided in the interior of the upper mold 1 and the interior of the lower mold 2, and an orthographic projection of the vacuum grooves 4 in the upper mold 1 on a plane where the part to be molded is located does not overlap with an orthographic projection of the vacuum grooves 4 in the lower mold 2 on a plane where the part to be molded is located, that is, the vacuum grooves 4 in the upper mold 1 and the vacuum grooves 4 in the lower mold 2 are arranged in a staggered manner, so that unnecessary deformation of the part to be molded caused by vacuum pumping can be avoided as much as possible. In an actual production process, the diameter and the number of the vacuum grooves 4 can be adjusted according to the actual production. Preferably, in the present embodiment, the vacuum grooves 4 are provided in an amount of 100 in the interior of the upper mold 1 and the interior of the lower mold 2, respectively, and have a hole diameter of 1 to 3 mm.

The vacuum pump 3 is used for applying vacuum negative pressure and/or positive pressure to the molding cavity.

It should be noted that the vacuum pump 3 is used for applying negative vacuum pressure and/or positive vacuum pressure to the molding cavity, and the effect of removing VOC substances and odor from the vehicle interior parts can be better improved by using the vacuum negative pressure and the positive vacuum pressure in a matched manner. Preferably, in the present embodiment, the vacuum pump 3 may be a bidirectional pump having a vacuum-pumping function and a reverse pressurizing function for pressurizing the inside of the mold; or one pressure pump is connected in series for vacuumizing and pressurizing; or one pressure pump for vacuum pumping and pressure application can be connected in parallel.

As shown in fig. 2, an embodiment of the present invention further provides a molding method applied to the above mold structure, where the method includes:

s201: placing the upper die, the lower die and/or the part to be molded in a molding heating system for heating;

s202: placing the part to be molded into the upper mold and the lower mold, and performing mold closing molding;

s203: and starting the vacuum pump, controlling the pressure in the molding cavity to reach a set threshold value, and maintaining the pressure for a set time.

Before a part to be molded enters a mold, the upper mold 1, the lower mold 2 and/or the part to be molded are placed in a mold pressing heating system and heated to a set temperature according to the actual production temperature, then the part to be molded is placed in the upper mold 1 and the lower mold 2, mold closing and molding are performed, after mold closing, a vacuum pump 3 is started, VOC substances and gas are extracted from a molding cavity through a vacuum groove 4 and are exhausted to the outside of the upper mold 1 and the lower mold 2 or a unified air processor, the upper mold 1 and the lower mold 2 keep a set pressure, the part to be molded is molded, and meanwhile the vacuum pump 3 controls a pressure value in the molding cavity to set a threshold value and maintains the pressure value for a set time.

Since the emissions such as VOC substances and gases inside and on the surface of the part to be molded migrate to the surface and outside of the part to be molded due to the enhanced thermal activity, the material of the heated part to be molded is softened, the migration resistance of the emissions such as VOC substances and gases is reduced, the migration speed is increased, and the vacuum pump 3 further accelerates the process by applying negative vacuum pressure and/or positive pressure to the inside of the molding cavity. The vacuum pump 3 controls the pressure value in the molding cavity to set a threshold value, and after the pressure value is maintained for a set time, most of VOC substances, gas and other emissions on the surface of the part to be molded are removed out of the part to be molded, and part of residual VOC substances, gas and other emissions in the part to be molded are removed out of the part to be molded.

The control molding cavity internal pressure is to setting threshold to the settlement time, include:

It should be noted that the vacuum pump 3 is used for applying negative vacuum pressure and/or positive pressure to the molding cavity, so that three methods for controlling the pressure in the molding cavity to a set threshold value can be selected according to the material of the part to be molded, and each method comprises:

firstly, applying vacuum negative pressure to the forming cavity until the set threshold value is reached and maintaining the set time;

after the die is closed, the vacuum pump 3 works, and vacuum negative pressure is applied to VOC substances and gas in the forming cavity and the part to be formed through the vacuum groove 4, so that the VOC substances and the gas are discharged out of the upper die 1 and the lower die 2.

Secondly, after positive pressure is applied to the vacuum cavity, negative vacuum pressure is applied to the vacuum cavity until the set threshold value is reached and the set time is maintained;

after the die is closed, the vacuum pump 3 applies positive pressure to the molding cavity, then the molding cavity is suddenly vacuumized, and vacuum negative pressure is applied to VOC substances and gas in the molding cavity and in the part to be molded through the vacuum groove 4, so that the VOC substances and the gas are discharged out of the upper die and the lower die.

And thirdly, applying positive pressure and vacuum negative pressure to the vacuum cavity alternately, and alternately setting times.

After the die is closed, the vacuum pump 3 applies positive pressure to the forming cavity, then the vacuum pumping is performed suddenly, vacuum negative pressure is applied to VOC substances and gas in the forming cavity and in the part to be formed through the vacuum groove 4, the VOC substances and the gas are discharged out of the upper die and the lower die, the discharge effect can be improved after the VOC substances and the gas are circulated for a plurality of times according to the process.

The method further comprises the following steps:

After the part to be molded is molded, the vacuum pump 3 is depressurized, the upper mold 1 and the lower mold 2 are opened, and the molded part is demolded.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims

1. A mold structure, comprising:

the vacuum pump is used for exhausting gas in the part to be molded;

2. The mold structure according to claim 1, characterized in that the upper mold is formed with a first convex body toward the lower mold; the lower die is provided with a second bulge towards the upper die;

the first bulge is connected with the second bulge in a matched mode.

3. The mold structure according to claim 1, wherein the upper mold and the lower mold have a clearance after being clamped.

4. The mold structure according to claim 1, wherein the number of the vacuum grooves is plural.

5. The mold structure according to claim 1, wherein an orthographic projection of the vacuum grooves in the upper mold on a plane of the part to be molded is not overlapped with an orthographic projection of the vacuum grooves in the lower mold on a plane of the part to be molded.

6. Mould structure according to claim 1, wherein the vacuum pump is used for applying a negative vacuum pressure and/or a positive pressure to the forming cavity.

7. A molding method applied to the mold structure according to any one of claims 1 to 6, characterized in that the method comprises:

placing the part to be molded into the upper mold and the lower mold, and performing mold closing molding;

and starting the vacuum pump, controlling the pressure in the molding cavity to reach a set threshold value, and maintaining the pressure for a set time.

8. The molding process according to claim 7, wherein said controlling the pressure in the mold cavity to a set threshold and for a set time comprises:

9. The embossing method as set forth in claim 7, further including: