WO2022022389A1

WO2022022389A1 - Processing apparatus and injection molding method

Info

Publication number: WO2022022389A1
Application number: PCT/CN2021/107936
Authority: WO
Inventors: 李艳华; 陈爱华
Original assignee: 奥托立夫开发公司
Priority date: 2020-07-28
Filing date: 2021-07-22
Publication date: 2022-02-03
Also published as: CN113997519A

Abstract

A processing apparatus (10) and an injection molding method. The processing apparatus (10) is for use in injection molding and comprises: a molding die (100) and a molding cavity (200) used for defining the structure of a piece to be molded; also comprises a sliding block (300) provided in a cavity of the molding die (100). The sliding block (300) can be driven by a driver (400) to move within the cavity relative to the molding die (100), thus entering the molding cavity (200) by a predetermined distance at a predetermined time during injection molding.

Description

Processing device and injection molding method

technical field

The present invention relates to a processing method, in particular, to a processing apparatus and an injection molding method.

Background technique

In some cover type parts, a force weakness is usually provided, and when the cover is stressed, the force weakness will break before other areas of the cover. An example of a cover is an airbag cover included in an airbag (also called a driver's airbag) arranged in the steering wheel. When the vehicle collides or is impacted, the inflator of the driver's airbag receives a signal sent via the wiring harness connected to the inflator, and bursts occur. Then, the gas generated by the explosion will rapidly inflate the folded air bag of the driver's airbag, the inflated air bag will expand, and then it will rush out from the weak part of the airbag cover and extend to the front of the driver. at the predetermined position, so as to avoid the injury caused by the impact of the occupant.

However, in prior art driver airbags, there is a significant difference in appearance gloss between the weak areas of the airbag cover and other areas of the airbag cover. Since the airbag cover is also used as part of the steering wheel of the vehicle, the above-mentioned difference in appearance gloss will result in a poor quality of the outer surface of the steering wheel.

SUMMARY OF THE INVENTION

The present invention provides a processing device and an injection moulding method which can be used for processing moulded parts, in particular cap-type parts, so as to have a better outer surface quality.

One aspect of the present invention provides a processing apparatus for injection molding and comprising,

Cores and cavities used to define the configuration of the part to be formed,

in,

Also included is a slider disposed within a cavity in the core, the slider being capable of being displaced within the cavity relative to the core by a drive to enter the core at a predetermined time during injection molding Cavity predetermined distance.

According to an embodiment of the present invention, the end of the slider entering the cavity has a predetermined configuration, and the predetermined configuration of the slider is used for a part of the configuration of the part to be formed.

According to an embodiment of the present invention, a transmission member is further provided between the driver and the slider, and the transmission member is used to transmit the driving force of the driver to the slider.

According to an embodiment of the present invention, the transmission member is configured to be movable along a first direction under the driving of the driver, and the slider is configured to move along the first direction when the transmission member is driven When moving, it moves along a second direction, and the first direction is different from the second direction.

According to an embodiment of the present invention, the transmission member includes a transmission section, and the slider is configured to be displaced by movement of one end thereof relative to the transmission section.

According to an embodiment of the present invention, the transmission section of the transmission member is configured as a section with an inclined surface, and one end of the slider is configured to move on the inclined surface.

According to an embodiment of the present invention, a first restricting portion for restricting the displacement of the slider and/or a second restricting portion for restricting the displacement of the transmission member are further provided.

According to an embodiment of the present invention, the first restricting portion is configured as a first stepped surface in the cavity of the core, and/or the second restricting portion is configured as a first step surface in the core on the second step surface.

According to an embodiment of the present invention, the driver is configured as a hydraulic driver mounted on a mold base of the processing device, and the transmission member is fixedly connected to the hydraulic driver.

Another aspect of the present invention provides an injection molding method for processing a cover, and wherein the cover includes a region of weakness,

in,

performing the injection molding method using the aforementioned processing apparatus,

Wherein, the injection molding method includes the following steps:

At a predetermined time during injection molding, the slider is driven by the driver to be displaced relative to the core within the cavity to enter the cavity a predetermined distance to form all of the cover. Weak area.

According to an embodiment of the present invention, the predetermined time is set to be different from the start time of the pressure holding phase by a predetermined value.

According to an embodiment of the present invention, after the slider enters the cavity for the predetermined distance, it remains at a predetermined position defined by the predetermined distance until the end of the pressure-holding stage.

According to an embodiment of the present invention, the cover is used for an airbag cover of an airbag.

Description of drawings

Figure 1 schematically shows a processing apparatus according to an embodiment of the invention, wherein the slide is in a first position.

Figure 2 schematically shows a processing device according to an embodiment of the invention, wherein the slide is in a second position.

FIG. 3 schematically shows a processing apparatus according to an embodiment of the present invention.

detailed description

Specific embodiments of the processing apparatus and the injection molding method according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and accompanying drawings are used to illustrate the principles of the present invention by way of example, the present invention is not limited to the described preferred embodiments, and the protection scope of the present invention is defined by the claims.

Additionally, spatially relative terms (such as "upper," "lower," "left," and "right," etc.) are used to describe the relative positional relationship of elements shown in the figures to another element. Accordingly, spatially relative terms may be applied in directions other than those shown in the figures when used. Obviously, while all of these spatially relative terms refer to the orientation shown in the figures for ease of illustration, those skilled in the art will appreciate that orientations other than those shown in the figures may be used.

Figure 1 schematically shows a processing apparatus according to an embodiment of the invention, wherein the slide is in a first position. Figure 2 schematically shows a processing device according to an embodiment of the invention, wherein the slide is in a second position. The processing apparatus according to the embodiment of the present invention will be described below with reference to FIGS. 1 and 2 .

As shown in FIGS. 1 and 2 , the processing apparatus according to the embodiment of the present invention is used for injection molding, and includes a core 100 and a cavity 200 for defining the configuration of a to-be-molded piece. It will be appreciated that, for example, a polymeric material is injected into the cavity 200 for forming the part to be formed. And, the processing apparatus 10 according to the embodiment of the present invention further includes a slider 300 disposed in the cavity of the core 100, and the slider 300 can be driven by the driver 400 to be displaced relative to the core 100 in the cavity, so as to A predetermined distance into the cavity 200 at a predetermined time during injection molding. Specifically, in FIG. 1 , the slider 300 is shown in the first position, that is, one end of the slider 300 is at a distance D1 from the bottom of the cavity; and in FIG. 2 , the slider 300 is shown in the second position, that is, , the distance between one end of the slider 300 and the bottom of the cavity is D2; in other words, the distance that the slider 300 moves from the first position shown in FIG. 1 to the second position shown in FIG. 2 under the drive of the driver 400 is A predetermined distance (D1-D2). It should be noted that the distance D1 is close to the thickness of the part of the cavity 200 that is not at the cavity of the core 100 .

Also, as shown in FIGS. 1 and 2 , one end of the slider 300 entering the cavity 200 according to the embodiment of the present invention (ie, the lower end of the slider 300 in FIGS. 1 and 2 ) has a predetermined configuration, and the slider 300 has a predetermined configuration. This predetermined configuration of block 300 is used as part of the configuration of the part to be formed. For example, in an exemplary embodiment according to the present invention, as shown in FIG. 2 , the end of the slider 300 entering the cavity 200 has a predetermined configuration for forming the weak force area A of the part to be formed.

FIG. 3 schematically shows a processing apparatus according to an embodiment of the present invention. The processing apparatus according to the embodiment of the present invention will continue to be described below with reference to FIG. 3 .

As shown in FIG. 3 , in the processing device 10 according to the embodiment of the present invention, a transmission member 500 is further provided between the driver 400 and the slider 300 , and the transmission member 500 is used to transmit the driving force of the driver 400 to the Slider 300. In the embodiment shown in FIG. 3 , the driver 400 is configured as a hydraulic driver mounted on the mold base 600 of the processing apparatus 10 , and the transmission member 500 is fixed to the hydraulic driver (eg, the end of the piston of the hydraulic driver) connect. Specifically, as shown in FIG. 3 , the transmission member 500 is configured to be able to move in a first direction (ie, the left-right direction indicated by the arrow in FIG. 3 ) under the driving of the driver 400 , and the slider 300 is configured In order to move along the second direction (ie, the up and down direction indicated by the arrow in FIG. 3 ) when the transmission member 500 moves along the first direction, and the first direction is perpendicular to the second direction (this is only an example, the One direction is not limited to be perpendicular to the second direction, the first direction and the second direction may intersect in a manner other than 90 degrees, or even the same direction). Further, the transmission member 500 includes a transmission section which is located at the right end of the transmission member 500 and is configured as a section having a slope, and one end (ie, the lower end shown in FIG. 3 ) of the slider 300 is configured Displacement for moving on an inclined plane. It can be understood that in FIG. 3 , when the driver 400 drives the transmission member 500 to move to the right, the inclined surface on the transmission section of the transmission member 500 moves the slider 300 upward; and, when the driver 400 drives the transmission member 500 to move to the left , the slider 300 will move downward with the movement of the slope on the transmission section of the transmission member 500 . It should be noted that the processing device of the present invention is not limited to the above-described embodiments, that is, the processing device of the present invention is not limited to including the transmission member and the specific transmission member described above. For example, in the processing device of the present invention, the The driver directly drives the slider, or the transmission member can be set to other forms, for example, the form of rack and pinion transmission.

Continuing to describe the processing apparatus 10 according to the embodiment of the present invention with reference to FIG. 3 .

As shown in FIG. 3 , the processing device 10 according to the embodiment of the present invention is further provided with a first restricting portion that restricts the displacement of the slider 300 and a second restricting portion that restricts the displacement of the transmission member 500 , specifically , the first restricting portion is configured as a first stepped surface 101 in the cavity of the core 100 , and the second restricting portion is configured as a second stepped surface 102 on the core 10 . However, this is only an example, and the processing device of the present invention is not limited to this. For example, the slider and the transmission member may not be provided with a stopper, or other types of stopper may be provided.

The following describes the use of the aforementioned processing apparatus 10 to perform an injection molding method that can be used to process covers, for example, airbag covers for driver airbags, airbag covers for passenger airbags, and airbag covers for knee airbags etc. Furthermore, the cover includes a region of weakness. As shown in FIGS. 1 and 2 , the injection molding method according to the present invention includes the following steps: at a predetermined time during injection molding, the slider 300 is driven by the driver 400 to move relative to the core 100 in the cavity of the core 100 position, so as to enter the cavity 200 a predetermined distance to form a weak area of the cover.

In an exemplary embodiment, the predetermined time is set to be different from the start time of the dwell phase by a predetermined value, eg, 0.2 seconds before the start of the dwell phase, or 0.005 seconds after the start of the dwell phase. Moreover, in an exemplary embodiment according to the present invention, the slider is kept at a predetermined position defined by the predetermined distance after entering the cavity by the predetermined distance until the end of the pressure-holding stage.

In cap type parts, where a weak area is usually provided, the thickness of the weak area is significantly smaller than the thickness of the other areas, this apparent thickness difference will cause shrinkage and stress unevenness at the weak area during injection molding , thereby adversely affecting the uniformity of the apparent glossiness of cover-type parts, ultimately resulting in poorer exterior surface quality.

Therefore, in the processing device according to the present invention and the method for performing injection molding using the same, by arranging a slider in a cavity in the core, the slider can be driven by a driver to be displaced relative to the core in the cavity, Thereby entering the cavity a predetermined distance at a predetermined time during injection molding, so that not all the stages of injection molding exist significant thickness differences between the above-mentioned weak areas of force and other areas, thus mitigating at the weak areas of force Causes shrinkage and stress non-uniformity to ensure a consistent gloss finish and better exterior surface quality for cover-type parts.

As mentioned above, although the exemplary embodiments of the present invention have been described in the description with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, and the protection scope of the present invention should be defined by the claims and their equivalents.

Claims

A processing device (10) for injection molding and comprising,

a core (100) and a cavity (200) for defining the configuration of the part to be formed,

It is characterized in that,

Also included is a slider (300) disposed in a cavity in the core (100), the slider (300) being capable of being driven by a driver (400) relative to the core (100) in the cavity ) is displaced so as to enter the cavity (200) a predetermined distance at a predetermined time during injection molding.
The processing device (10) according to claim 1, wherein an end of the slider (300) entering the cavity (200) has a predetermined configuration, and the predetermined configuration of the slider (300) The configuration is for a portion of the configuration of the part to be formed.
The processing device (10) according to claim 2, wherein a transmission member (500) is further provided between the driver (400) and the slider (300), and the transmission member (500) ) is used to transmit the driving force of the driver (400) to the slider (300).
The processing device (10) according to claim 3, wherein the transmission member (500) is configured to be movable along a first direction under the driving of the driver (400), and the slider ( 300) is configured to move along a second direction when the transmission member (500) moves along the first direction, and the first direction is different from the second direction.
The processing device (10) according to claim 4, wherein the transmission member (500) comprises a transmission section, and the slider (300) is configured to be relative to the transmission section by one end of the slider (300). move to cause displacement.
The processing device (10) according to claim 5, wherein the transmission section of the transmission element (500) is configured as a section with a slope, and one end of the slide (300) is configured to move on the slope.
The processing device (10) according to claim 6, further provided with a first restricting portion that restricts the displacement of the slider (300) and/or the displacement of the transmission member (500). The second restricting portion that restricts.
The processing device (10) according to claim 7, wherein the first restriction is configured as a first stepped surface (101) within the cavity of the core (100), and/or, The second restriction is configured as a second stepped surface (102) on the core (100).
The processing device (10) according to claim 8, wherein the drive (400) is configured as a hydraulic drive mounted on a mold base of the processing device (10), and the transmission member (500) fixedly connected to the hydraulic drive.
An injection molding method for machining a cover, and wherein the cover includes a region of weakness,

It is characterized in that,

performing the injection molding method using the processing device (10) according to any one of claims 1-9,

Wherein, the injection molding method includes the following steps:

At a predetermined moment during injection molding, the slider (300) is driven by the driver (400) to be displaced relative to the core (100) in the cavity, thereby entering the cavity (200) ) a predetermined distance to form the force weak zone of the cover.
The injection molding method according to claim 10, wherein the predetermined time is set to be different from the start time of the pressure holding phase by a predetermined value.
The injection molding method according to claim 11, wherein the slider (300) is kept at a predetermined position defined by the predetermined distance after entering the mold cavity (200) by the predetermined distance until the holding The compression phase ends.
The injection molding method of claim 12, wherein the cover is used for an airbag cover of an airbag.