Automobile bumper capable of preventing demolding deformation

Abstract

The automobile bumper comprises a left shell and a right shell which are symmetrical, corner positions are arranged below the left shell and the right shell, turnups are arranged at the bottoms of the corner positions, elastic pieces are arranged on the turnups on at least one side face of the corner positions, and the elastic pieces are parallel to the side faces where the elastic pieces are located and extend out of the side faces where the elastic pieces are located. The elastic sheet is arranged on the side face of the corner position where a bumper product is prone to forced demolding deformation, the elastic sheet blocks the bumper product when the bumper product is demolded, smooth demolding of the bumper product is achieved, the appearance of a finished bumper is improved, the yield is greatly increased, the production reject ratio is 80% before improvement, the product reject ratio is 0% through improvement, and mass production can be conducted smoothly.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to an automobile bumper capable of preventing mold release and deformation. Background Art

[0002] Automobile bumper products, especially front bumpers, are usually prepared by injection molding of a left-right symmetrical shell. A corner is usually designed at the bottom of the shell near the wheel to meet usage requirements. During injection molding, the corner is ejected by an inclined ejector, but a flange is usually provided at the bottom of the corner to facilitate snap-fit ​​assembly. The flange thickness is usually 2-3mm and has strong strength. During demolding, due to the irregularity of the bumper shell, the demolding directions of the corners are inconsistent, and the flange strength is strong, resulting in strong detachment, which leads to local deformation at the corner, affecting the yield rate. Utility Model Content

[0003] Based on this, the utility model provides an automobile bumper which can prevent mold release and deformation.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a car bumper that prevents demolding deformation, comprising a symmetrical left shell body and a right shell body, wherein the left shell body and the right shell body have a corner position at the bottom, and a flange is provided at the bottom of the corner position, and a spring sheet is provided on the flange of at least one side of the corner position, and the spring sheet is parallel to the side where it is located and extends out of the side where it is located.

[0005] Since the product has a flange at the bottom, the flange is strong, and there is a large gap between the product and the main body during demolding. Some parts are strongly released, which can easily cause deformation and whitening at the corners during ejection. However, if the flange thickness is reduced, the strength of use will be affected. This solution sets a spring sheet on the side of the corner to block the product during demolding, so that the product can be demolded smoothly. Depending on the specific deformation situation, it can be set on one side of the corner or on both sides.

[0006] Preferably, when the flange thickness is 2mm-3mm, the distance between the spring piece and the corner vertex is 10mm-30mm, and the distance between the spring piece and the corner vertex refers to the length from the front end of the spring piece along the flange to the corner vertex.

[0007] Preferably, the spring piece is 10mm-18mm long, 4mm-10mm wide, 2mm high and 2mm thick.

[0008] Further preferably, when the deformation length at the corner position is ≤10 mm, the spring piece is 15 mm-18 mm long, 4 mm-8 mm wide, and 2 mm thick.

[0009] Further preferably, when the deformation length at the corner position is 10-15 mm, the spring piece is 18 mm-22 mm long, 6 mm-10 mm wide, and 2 mm thick.

[0010] Preferably, the bottom of the side where the spring sheet contacts the flange is a slope to facilitate demoulding. Preferably, the slope angle is 20°-60°, and more preferably 30°-45°.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model provides spring sheets on the sides of the corners where strong stripping and deformation easily occur in bumper products, so that the spring sheets block the products when demoulding, thereby achieving smooth demoulding of the products, improving the appearance of the finished bumper products, and greatly improving the yield rate. Before the improvement, the production defect rate was 80%, but through the improvement of the utility model, the product defect rate is 0%, and mass production can be smoothly achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is one of the structural schematic diagrams of automobile bumpers in the prior art;

[0014] Figure 2 The second schematic diagram of the structure of an automobile bumper in the prior art;

[0015] Figure 3 This is one of the schematic diagrams of the automobile bumper structure of the utility model;

[0016] Figure 4 This is the second schematic diagram of the automobile bumper structure of the utility model;

[0017] Figure 5 This is the third schematic diagram of the automobile bumper structure of the utility model;

[0018] Figure 6 This is the fourth structural schematic diagram of the automobile bumper of the present utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the invention clearer, the utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1-2 As shown, in the prior art, automobile bumpers, especially for front bumper products, usually include left-right symmetrical shells 1' and 2'. Below the left and right shells, near the wheels, is usually designed as a corner 3', and in order to facilitate installation and buckling, the bottom of the shell is usually provided with a flange 4'. During injection molding, the corner 3' is ejected by an inclined ejector. Since the flange 4' is strong, there is a large gap between the body and the bumper product itself. The bumper product itself is an inward buckled body with a special ejection direction. There is strong detachment at some positions, resulting in deformation of the sharp corners of the product during ejection.

[0021] To this end, the utility model provides an example of a car bumper that prevents demoulding deformation, such as Figure 3-6 As shown, it includes symmetrical left shell 1 and right shell 2, with a corner 3 below the left shell 1 and the right shell 2, and a flange 4 is provided at the bottom of the corner, and a spring piece 5 is provided on the flange 4 on at least one side of the corner, and the spring piece 5 is parallel to the side where it is located and extends out of the side where it is located.

[0022] By arranging the spring sheet 5 near the corner position 3, the spring sheet blocks the product when it is demoulded, so that the product can be smoothly demoulded. According to the specific deformation situation, it can be arranged on one side of the corner position, or it can be arranged on both sides.

[0023] The spring piece 5 mainly plays the role of blocking and smooth demoulding, and has a certain strength and does not need to be too large. It can be determined according to the deformation length of the specific corner position.

[0024] When the thickness of the flange 4 is 2-3 mm, the spring piece 4 is 10-30 mm away from the vertex of the corner position 3 .

[0025] In some embodiments, when the deformation length of the corner position is ≤10 mm, the spring piece 5 is 15-18 mm long, 4-8 mm wide, and 2 mm thick.

[0026] In some embodiments, when the deformation length of the corner position is 10-15 mm, the spring piece 5 is 18-22 mm long, 6-10 mm wide, and 2 mm thick.

[0027] In some embodiments, Figure 6 As shown, the bottom of the side where the spring piece 5 contacts the flange 4 is a slope, which is convenient for demoulding. In some specific embodiments, the slope angle is 20°, 30°, 35°, 40°, 45°, 50°, 60°, etc.

[0028] According to actual production statistics, the production defect rate was as high as 80% before the spring clip was added. After the spring clip structure was introduced, the defect rate of automobile bumper products was 0%, and mass production could be carried out smoothly.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A car bumper for preventing mold release deformation, comprising a symmetrical left shell and a right shell, wherein the left shell and the right shell have a corner below, and a flange is provided at the bottom of the corner, characterized in that: A spring sheet is provided on the flange of at least one side of the corner, and the spring sheet is parallel to the side where the spring sheet is located and extends out of the side where the spring sheet is located.

2. The automobile bumper according to claim 1, characterized in that: The thickness of the flange is 2mm-3mm, and the distance between the spring piece and the vertex of the corner position is 10mm-30mm.

3. The automobile bumper according to claim 2, characterized in that: The spring piece is 10mm-18mm long, 4mm-10mm wide, 2mm high and 2mm thick.

4. The automobile bumper according to claim 3, characterized in that: When the deformation length of the corner is ≤10mm, the spring is 15mm-18mm long, 4mm-8mm wide and 2mm thick.

5. The automobile bumper according to claim 3, characterized in that: When the deformation length at the corner is 10-15mm, the spring is 18mm-22mm long, 6mm-10mm wide and 2mm thick.

6. The automobile bumper according to any one of claims 1 to 5, characterized in that: The bottom of the side where the spring piece contacts the flange is an inclined surface.

7. The automobile bumper according to claim 6, characterized in that: The bevel angle is 20°-60°.

8. The automobile bumper according to claim 7, characterized in that: The angle of the inclined surface is 30°-45°.

Images