A method for preventing injection molding deformation of automotive fans

Abstract

This invention provides a method for preventing injection molding deformation of an automotive fan, relating to the field of automotive fan manufacturing technology. The method comprises the following steps: a) confirming the deformation trend of the fan rim; in step a), mold flow analysis is used to confirm the deformation amount at the connection between the fan blades and the fan rim, as well as the deformation amount of the fan rim between adjacent blades; b) confirming the reverse compensation amount of the fan rim; in step b, several original points are first marked circumferentially in the theoretical data model, and then the reverse compensation amount of all the original points is determined through all the deformation amounts, with the angle between adjacent original points not exceeding 5°; c) confirming the compensation amount curve; d) confirming the fan mold. Overall, this application pre-adjusts the deformation position of the automotive fan and processes the compensation amount in the fan mold, thereby ensuring that the ejected fan meets the design requirements.

Description

Technical Field

[0001] This invention relates to the field of automotive fan manufacturing technology, and in particular to a method for preventing injection molding deformation of automotive fans. Background Technology

[0002] An automotive cooling fan is a circular product, typically composed of three parts: a motor mounting area, a blade area (usually with 7-11 blades unevenly distributed around the perimeter), and a fan ring. The fan ring and motor area are connected by the blades. Due to the uneven distribution of the blades and the large gaps between them, the product tends to deform irregularly after injection molding due to the shrinkage characteristics of the plastic. The area where the fan ring connects to the blades shrinks more, causing the blades to arch relative to each other. This directly leads to a significant deviation from the theoretical value in the roundness of the fan ring, resulting in product scrap.

[0003] Therefore, there is an urgent need for an effective method to prevent injection molding deformation of automotive fans and improve the mold pass rate. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preventing injection molding deformation of automotive fans, solving the technical problem in the prior art where the deformation of automotive fans after demolding does not meet design requirements. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention provides a method for preventing injection molding deformation of an automotive fan, comprising the following steps:

[0007] a. Confirm the deformation trend of the car fan's fan blades;

[0008] In step a, the deformation at the connection between the blades and the fan ring of the automotive fan, as well as the deformation of the fan ring located between adjacent blades, are confirmed through mold flow analysis.

[0009] b. Confirm the reverse compensation amount of the fan ring;

[0010] In step b, several original points are first marked on the circumference of the theoretical data model, and then the reverse compensation amount of all the original points is determined by all the deformation amounts. The angle between adjacent original points is no greater than 5°.

[0011] c. Confirm the compensation curve;

[0012] d. Confirm the fan mold.

[0013] Preferably, in step c, based on the reverse compensation amount and along the radial direction of the original point, several compensation points are marked, and all the compensation points are connected to form the compensation amount curve.

[0014] Preferably, in the direction away from the center, the distance of the farthest compensation point is greater than the distance of the original point by 0.6 mm; in the direction closer to the center, the distance of the nearest compensation point is less than the distance of the original point by 0.6 mm.

[0015] Preferably, the farthest compensation point is located between adjacent blades, and the nearest compensation point is located at the connection between the blade and the fan ring.

[0016] Preferably, in step d, when the fan mold is made according to the compensation curve, the wall thickness of the fan ring remains unchanged.

[0017] Preferably, the car fan is manufactured according to the fan mold, and steps b to d are repeated until the car fan that meets the design requirements is manufactured.

[0018] In actual production, due to the uneven distribution of blades and large gaps between them, the product tends to deform irregularly after injection molding due to the shrinkage characteristics of plastic. The area connected to the blades shrinks more, and the blades arch relative to each other, resulting in deformation. This application first confirms that the deformation of the fan ring in the automotive fan data model basically matches the deformation of the actual product. The deformation dimensions at the deformation points, i.e., the dimensions of the fan ring's protrusions or depressions, are measured based on theoretical data. Then, the reverse compensation amount of the fan ring is determined based on these deformation dimensions; that is, the dimensions are reduced at the protruding positions and increased at the concave positions in the theoretical data. A compensation curve is formed by connecting the apex of the protrusion and the trough of the concave position, and the fan model is made based on this compensation curve. Overall, this application achieves the design requirements for the ejected fan by pre-adjusting the deformation position of the automotive fan and machining the compensation amount in the fan mold. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the automotive fan design of the present invention;

[0021] Figure 2 This is a schematic diagram of the automotive fan flow analysis state according to the present invention;

[0022] Figure 3 This is a schematic diagram of the automotive fan compensation state according to the present invention.

[0023] In the diagram, 1-motor mounting area; 2-blade; 3-fan ring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] refer to Figure 1-3 A specific embodiment of the present invention provides a method for preventing injection molding deformation of an automotive fan, the steps of which are as follows:

[0026] a. Confirm the deformation trend of the fan ring 3 of the car fan;

[0027] b. Confirm the reverse compensation amount of sector ring 3;

[0028] c. Confirm the compensation curve;

[0029] d. Confirm the fan mold.

[0030] In actual production, the fan ring 3 and the motor fixing area 1 are connected by blades 2. Due to the uneven distribution of blades 2 and the large gaps between blades 2, after injection molding, the product tends to deform irregularly due to the shrinkage characteristics of plastic. The area connected to the blades 2 shrinks more, and the blades 2 arch relative to each other, resulting in deformation. In this application, the deformation of the fan ring 3 in the automotive fan data model is first confirmed to be basically consistent with the deformation of the actual product. The deformation size at the deformation point, i.e., the size of the protrusion or depression of the fan ring 3, is measured according to theoretical data. Then, the reverse compensation amount of the fan ring 3 is determined according to the deformation size, i.e., the size is reduced at the protrusion position and increased at the depression position in the theoretical data. The compensation amount curve is formed by connecting the apex of the protrusion and the trough of the depression, and the fan model is made according to the compensation amount curve. Overall, this application achieves the design requirements by pre-adjusting the deformation position of the automotive fan and processing the compensation amount in the fan mold.

[0031] To further optimize the scheme, in step a, the deformation at the connection between the blade 2 and the fan ring 3 of the car fan, as well as the deformation of the fan ring 3 located between adjacent blades 2, are confirmed through mold flow analysis.

[0032] The deformation of the fan model was analyzed using mold flow analysis software, and the deformation basically matches that of the actual product. Deformation occurs at the connection between blade 2 and fan ring 3, and between adjacent blades 2. A depression appears at the connection between blade 2 and fan ring 3, and a bulge appears between adjacent blades 2. Figure 2 As shown.

[0033] To further optimize the scheme, in step b, several original points are first marked on the circumference of the theoretical data model, and then the reverse compensation amount of all original points is determined by all deformations.

[0034] The original point is used as the reference point for setting the reverse compensation amount, i.e., the theoretical size. The specific deformation size at the deformation point is determined based on the original point, and this deformation size is the reverse compensation amount.

[0035] The scheme was further optimized so that the angle between adjacent original points does not exceed 5°.

[0036] At least 72 sets of origin points are set, and the distance between adjacent origin points is the same, that is, the angle between adjacent origin points is no greater than 5°. By setting more origin points, the measurement accuracy of deformation can be increased, which can help to accurately grasp the mold size and ultimately make the size of the automotive fan injection molded parts more stable.

[0037] To further optimize the scheme, in step c, based on the reverse compensation amount and the radial direction along the original point, several compensation points are marked, and all compensation points are connected to form a compensation amount curve.

[0038] The compensation point is the reverse dimension point at the deformation location; the compensation amount corresponding to the protrusion is set radially closer to the center to form a protrusion compensation point, and the compensation amount corresponding to the depression is set radially away from the center to form a depression compensation point; connecting all the compensation points forms a compensation amount curve. Protrusions and depressions are as follows: Figure 2 As shown, correspondingly, Figure 2 The outward-convex portion is compensated towards the center (opposite to the direction of the convexity), and the inward-concave portion is compensated away from the center (opposite to the direction of the concavity). After compensation, it looks like... Figure 3 As shown.

[0039] Further optimization of the scheme: in the direction away from the center, the distance of the farthest compensation point is greater than the distance of the original point by 0.6mm; in the direction closer to the center, the distance of the nearest compensation point is less than the distance of the original point by 0.6mm.

[0040] Based on mold flow analysis and the deformation state of the actual product, the maximum distance between the compensation point farthest from the center (the place with the largest deformation) and the original point is 0.6mm, and the maximum distance between the compensation point closest to the center (the place with the largest deformation) and the original point is also 0.6mm.

[0041] The scheme was further optimized so that the farthest compensation point is located between adjacent blades 2, and the nearest compensation point is located at the connection between blade 2 and fan ring 3.

[0042] To further optimize the scheme, in step d, when making the fan mold based on the compensation curve, the wall thickness of the fan ring 3 remains unchanged.

[0043] During the process of making the automotive fan mold based on the compensation curve, the wall thickness of the fan ring 3 remains unchanged, so that it can be closer to the design state when demolding.

[0044] Further optimize the solution by manufacturing a car fan based on the fan mold, and repeat steps b to d until a car fan that meets the design requirements is produced.

[0045] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preventing injection molding deformation of an automotive fan, characterized in that... The steps are as follows: a. Confirm the deformation trend of the car fan's fan blades; In step a, the deformation at the connection between the blades and the fan ring of the automotive fan, as well as the deformation of the fan ring located between adjacent blades, are confirmed through mold flow analysis. b. Confirm the reverse compensation amount of the sector ring; In step b, several original points are first marked on the circumference of the theoretical data model, and then the reverse compensation amount of all the original points is determined by all the deformation amounts. The angle between adjacent original points is no greater than 5°. c. Confirm the compensation curve; d. Confirm the fan mold. In step d, when the fan mold is made according to the compensation curve, the wall thickness of the fan ring remains unchanged.

2. The method for preventing injection molding deformation of an automotive fan according to claim 1, characterized in that... In step c, based on the reverse compensation amount and the radial direction along the original point, several compensation points are marked, and all the compensation points are connected to form the compensation amount curve.

3. The method for preventing injection molding deformation of an automotive fan according to claim 2, characterized in that... In the direction away from the center, the distance of the farthest compensation point is greater than the distance of the original point by 0.6 mm; in the direction closer to the center, the distance of the nearest compensation point is less than the distance of the original point by 0.6 mm.

4. The method for preventing injection molding deformation of an automotive fan according to claim 3, characterized in that... The farthest compensation point is located between adjacent blades, and the nearest compensation point is located at the connection between the blade and the fan ring.

5. The method for preventing injection molding deformation of an automotive fan according to claim 1, characterized in that... The car fan is manufactured according to the fan mold, and steps b to d are repeated until the car fan that meets the design requirements is produced.

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