Method for determining molding space of undercut mounting structure for automotive injection molding parts

Abstract

The present invention discloses a method for determining the molding space of an inverted mounting structure for automotive injection moldings. The main design concept of the present invention is to determine the position and size of the inclined ejector head based on the cross-sectional structure of the inverted mounting structure in combination with a preset safety distance, a safety margin and a preset diameter of the inclined ejector rod, and thereby first determine the range of the inclined ejector space, and then determine the molding space of the inverted mounting structure. The design method proposed by the present invention is reasonable and reliable, which is conducive to quickly confirming the molding feasibility of the inverted mounting structure, thereby avoiding repeated experiments in the design process of injection molding products, while reducing the molding risk, improving the design efficiency and accuracy, and providing sufficient support and guarantee for the development of the inverted mounting structure on automotive injection moldings.

Description

Technical Field

[0001] The invention relates to the field of automobile processing and manufacturing, and in particular to a method for determining a molding space of an undercut installation structure for an automobile injection molded part. Background Art

[0002] When designing and developing injection molded parts for automobiles, in order to ensure the integrity and quality of the appearance of the injection molded parts, it is often not possible to arrange the installation points directly on the front of the injection molded parts. At the same time, it is necessary to ensure that the injection molded parts are easy to install and fix. Therefore, an inverted installation structure is often added to the back of the injection molded parts and fixed with buckles. Figure 1 The doghouse structure 200 (doghouse) on the back of the exterior panel 100 of a certain vehicle model shown is an inverted mounting structure of an injection molded part.

[0003] In the actual processing and production process, the doghouse structure on the injection molded part is in an inverted style during molding, so it cannot be directly demolded and must be molded with the help of the inclined top structure of the mold. Whether it can be molded in the end also requires further confirmation of whether the movement space of the inclined top is satisfied. Only when the movement space conditions of the inclined top are met, this type of inverted installation structure can be molded.

[0004] However, for this type of inverted mounting structure, it is difficult to directly measure and confirm through software or other means whether its space meets the molding requirements. Therefore, it is necessary to design the inclined top movement space for this type of inverted mounting structure to verify its molding feasibility. However, there is no molding design solution for this type of structure for injection molded parts in the industry. Summary of the invention

[0005] In view of the above, the present invention aims to provide a method for determining the molding space of an undercut mounting structure for automotive injection molded parts, so as to solve the problem that the feasibility of the undercut doghouse structure cannot be directly measured and confirmed when confirming the molding of the injection molded parts.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides a method for determining the molding space of an undercut installation structure for an automotive injection molded part, which comprises:

[0008] Step S1, pre-constructing a structural section of an inverted mounting structure;

[0009] Step S2, forming a sloping ejector section of the mold based on the structural section, including determining the position and size of the sloping ejector head according to a preset safety distance, a safety margin and a preset diameter of the sloping ejector rod;

[0010] Step S3, determining the space size of the inclined top according to the position and size of the inclined top head;

[0011] Step S4: Determine the molding space of the inverted mounting structure using the space size of the inclined roof and a preset safety margin.

[0012] In at least one possible implementation, determining the position and size of the inclined ejector head according to a preset safety distance, a safety margin, and a preset diameter of the inclined ejector rod includes:

[0013] Taking one side boundary of the inverted mounting structure as a reference, offsetting a preset first distance to determine the position of the first side edge of the inclined ejector head, wherein the first distance represents a safety distance;

[0014] Based on the position of the first side, a preset second distance is offset to obtain a hypotenuse boundary of the lift rod, wherein the second distance represents a first safety margin;

[0015] According to the position of the bevel edge boundary and the preset diameter, a preset third distance is offset to determine the position of the lower vertex of the second side of the bevel head, wherein the third distance represents a second safety margin;

[0016] Taking the lower vertex position as a reference, constructing a straight line with a preset angle to the demoulding direction to obtain the second side of the inclined ejector and the upper vertex position of the second side;

[0017] The position and size of the inclined top are determined by the first side and the second side.

[0018] In at least one possible implementation, determining the size of the inclined top space according to the position and size of the inclined top head includes:

[0019] The horizontal length of the inverted mounting structure itself, the horizontal length from one side boundary of the inverted mounting structure to the lower vertex of the second side of the inclined top head, and the horizontal lengths of the lower vertex and the upper vertex of the second side are added together to obtain the inclined top space size.

[0020] In at least one possible implementation, determining a molding space of the inverted mounting structure includes:

[0021] The molding space is obtained by adding the size of the inclined roof space, the horizontal length of the inverted mounting structure itself, and a preset fourth distance, wherein the fourth distance represents a third safety margin.

[0022] In at least one possible implementation, determining the size of the inclined top space according to the position and size of the inclined top head includes:

[0023] The horizontal length of the inverted mounting structure itself, the horizontal length from one side boundary of the inverted mounting structure to the lower vertex of the second side of the inclined top head, the horizontal length between the lower vertex and the upper vertex of the second side, and the length of the preset third safety margin are added together to obtain the inclined top space size.

[0024] In at least one possible implementation manner, the determination method further includes: combining the height of the inverted mounting structure and the protruding height of the inclined roof with each other to obtain the inclined roof height.

[0025] The main design concept of the present invention is to determine the position and size of the inclined ejector head based on the cross-sectional structure of the inverted mounting structure, combined with a preset safety distance, a safety margin and a preset diameter of the inclined ejector rod, and thereby first determine the range of the inclined ejector space, and then determine the molding space of the inverted mounting structure. The design method proposed in the present invention is reasonable and reliable, which is conducive to quickly confirming the molding feasibility of the inverted mounting structure, thereby avoiding repeated experiments in the design process of injection molding products, while reducing the molding risk, improving the design efficiency and accuracy, and providing sufficient support and guarantee for the development of the inverted mounting structure on automotive injection molding parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0027] Figure 1 A schematic diagram of a doghouse structure for an existing exterior panel injection molding;

[0028] Figure 2 A flow chart of a method for determining a molding space of an undercut mounting structure for an automotive injection molded part provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the space design and verification cross-section of the mold of the undercut installation structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0031] The present invention proposes an embodiment of a method for determining a molding space of an undercut type mounting structure for an automotive injection molded part. Specifically, the undercut type mounting structure on the injection molded part can generally be divided into a bumper inner parting structure and a Figure 1The schematic doghouse structure is used for reference. The present invention takes the doghouse structure as an example and provides the following verification steps: Figure 2 Indicatively, it includes:

[0032] Step S1, pre-constructing a structural section of an inverted mounting structure 1;

[0033] When designing the actual product structure, the structural section of the doghouse can be determined based on the surrounding environment of the installation location and the fixed standard parts, such as Figure 3 Hint.

[0034] Step S2, based on the structural section, forming a sloping ejector section of the mold, including determining the position and size of the sloping ejector head according to a preset safety distance, a safety margin, and a preset diameter of the sloping ejector rod (in some preferred embodiments, the design requirements for the inclination angle of the sloping ejector rod may also be checked, such as α≤10°);

[0035] Step S3, determining the space size of the inclined top according to the position and size of the inclined top head;

[0036] Step S4: Determine the molding space of the inverted mounting structure using the space size of the inclined roof and a preset safety margin.

[0037] The above-mentioned determination of the position and size of the inclined ejector head according to the preset safety distance, safety margin and preset diameter of the inclined ejector rod includes:

[0038] Taking one side boundary of the inverted mounting structure 1 as a reference, offsetting a preset first distance, and determining the position of the first side edge of the inclined head, wherein the first distance represents a safety distance;

[0039] Based on the position of the first side, a preset second distance is offset to obtain a hypotenuse boundary of the lift rod, wherein the second distance represents a first safety margin;

[0040] According to the position of the bevel edge boundary and the preset diameter, a preset third distance is offset to determine the position of the lower vertex of the second side of the bevel head, wherein the third distance represents a second safety margin;

[0041] Taking the lower vertex position as a reference, constructing a straight line with a preset angle to the demoulding direction to obtain the second side of the inclined ejector and the upper vertex position of the second side;

[0042] The position and size of the inclined top are determined by the first side and the second side.

[0043] Specific as Figure 3In the figure, the position of the first side C of the inclined ejector is determined by offsetting 5mm with the side boundary B of the doghouse structure as the reference; based on the first boundary C, the inclined boundary D (the top of the inclined ejector) of the inclined ejector rod is determined by offsetting 5mm. Here, the distance between BC is the safe distance between the mold inclined ejector and the doghouse structure body (that is, in actual operation, it is necessary to check that the safe distance between the inclined ejector and the doghouse structure meets the requirement of ≥5mm), and the gap between CD is the first safety margin for the installation of the inclined ejector rod (that is, in actual operation, it is necessary to check that the safe installation space between the inclined ejector rod and the edge of the doghouse is ≥5mm). Next, according to the position of the hypotenuse boundary D and the preset diameter of the lift rod, continue to offset the preset third distance to form a second safety margin. If the diameter of the lift rod is ≥16mm, then offset it by another 5mm to form a second safety margin (that is, in actual operation, it is necessary to check that the diameter of the lift rod is ≥Φ16mm); based on the second safety margin, the position of the lower vertex of the second side E of the lift head is obtained; then, taking the lower vertex as a reference, construct a straight line with a preset angle to the demolding direction (vertical direction) (the angle is set to ensure the normal movement of the lift head, such as the upper limit of β is set to 12°, that is, in actual operation, it is necessary to check that the angle of the back side of the lift head is ≤12°), and the second side E of the lift head is obtained.

[0044] Continuing from the above, the determination of the space size of the inclined top according to the position and size of the inclined top head may include:

[0045] Add the horizontal length of the inverted mounting structure itself, the horizontal length from one side boundary of the inverted mounting structure to the lower vertex of the second side of the inclined top head, and the horizontal length between the lower vertex and the upper vertex of the second side. The sum of these three horizontal lengths is the size of the inclined top space.

[0046] Based on this, the molding space of the inverted mounting structure is determined as follows:

[0047] The molding space is obtained by adding the size of the inclined roof space, the horizontal length of the inverted mounting structure itself, and a preset fourth distance, wherein the fourth distance represents a third safety margin.

[0048] For example, after the size of the inclined top is determined, the inclined top space can be determined to be L=L1+L2+L3, and the space that can be formed in the doghouse structure is Q=L1+L2+L3+L1+3mm, where 3mm is the third safety margin.

[0049] It should be noted that in other embodiments, the aforementioned inclined roof space size can also be obtained by summing the three horizontal lengths and the length of the preset third safety margin, such as L=L1+L2+L3+5mm, which is not described in detail in the present invention. It should be supplemented that, based on the aforementioned embodiments, in order to ensure the stability of the inclined roof movement, the inclined roof height can also be obtained by combining the height of the inverted mounting structure 1 and the protruding height of the inclined roof, which are interrelated.

[0050] Combination Figure 3 In the figure, H is the height of the inclined roof, which is the sum of the doghouse height H1 and the protruding height of the inclined roof H2, wherein the relationship between H1 and H2 can be referred to as follows: when H1≥the first preset height, H2 is designed according to ≥the first preset height, and when H1<the first preset height, H2 is designed according to the third preset height. That is, in actual operation, when it is necessary to check H1≥20mm (the first preset height), H2≥15mm (the second preset height); and when H1<20mm (the first preset height), H2≥25mm (the third preset height).

[0051] To sum up, the main design concept of the present invention is to determine the position and size of the inclined ejector head based on the cross-sectional structure of the inverted mounting structure, combined with the preset safety distance, safety margin and preset diameter of the inclined ejector rod, and thereby first determine the range of the inclined ejector space, and then determine the molding space of the inverted mounting structure. The design method proposed in the present invention is reasonable and reliable, which is conducive to quickly confirming the molding feasibility of the inverted mounting structure, thereby avoiding repeated experiments in the design process of injection molding products, while reducing the molding risk, improving the design efficiency and accuracy, and providing sufficient support and guarantee for the development of inverted mounting structures on automotive injection moldings.

[0052] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c may be single or multiple.

[0053] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A method for determining the molding space of an undercut mounting structure for automotive injection molding parts, characterized in that: include: Step S1, pre-constructing a structural section of an inverted mounting structure; Step S2, forming a sloping ejector section of the mold based on the structural section, including determining the position and size of the sloping ejector head according to a preset safety distance, a safety margin and a preset diameter of the sloping ejector rod; Step S3, determining the size of the inclined top space according to the position and size of the inclined top head, including: adding the horizontal length of the inverted mounting structure itself, the horizontal length from one side boundary of the inverted mounting structure to the lower vertex of the second side of the inclined top head, and the horizontal lengths of the lower vertex and the upper vertex of the second side to obtain the size of the inclined top space; or adding the horizontal length of the inverted mounting structure itself, the horizontal length from one side boundary of the inverted mounting structure to the lower vertex of the second side of the inclined top head, the horizontal lengths of the lower vertex and the upper vertex of the second side, and the length of a preset third safety margin to obtain the size of the inclined top space; Step S4, using the inclined top space size and the preset safety margin to determine the molding space of the inverted mounting structure, including: adding the inclined top space size, the horizontal length of the inverted mounting structure itself and a preset fourth distance to obtain the molding space, wherein the fourth distance represents the third safety margin.

2. The method for determining the molding space of the undercut installation structure for automotive injection molded parts according to claim 1, characterized in that: Determining the position and size of the inclined ejector head according to the preset safety distance, safety margin and preset diameter of the inclined ejector rod includes: Taking one side boundary of the inverted mounting structure as a reference, offsetting a preset first distance to determine the position of the first side edge of the inclined head, wherein the first distance represents a safety distance; Based on the position of the first side edge, a preset second distance is offset to obtain a hypotenuse boundary of the inclined ejector rod, wherein the second distance represents a first safety margin; According to the position of the bevel edge boundary and the preset diameter, a preset third distance is offset to determine the position of the lower vertex of the second side of the bevel head, wherein the third distance represents a second safety margin; Taking the lower vertex position as a reference, constructing a straight line with a preset angle to the demoulding direction to obtain the second side of the inclined ejector and the upper vertex position of the second side; The position and size of the inclined top are determined by the first side and the second side.

3. The method for determining the molding space of the undercut installation structure for automotive injection molded parts according to any one of claims 1 to 2, characterized in that: The determination method further includes: combining the height of the inverted mounting structure and the protruding height of the inclined roof with each other to obtain the inclined roof height.

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