Thin-wall part foaming soft support filling anti-vibration method

Abstract

The invention discloses a thin-wall part foaming soft support filling anti-vibration method, and belongs to the technical field of thin-wall part machining. The preparation method comprises the following steps: mixing and stirring isocyanate and premixed polyether polyol to prepare a soft support material; laying an isolating layer on the inner wall of the thin-wall part to be processed; the soft supporting material is poured into the thin-wall part to be machined; after the soft supporting material is foamed, the thin-wall part to be machined is supported from the interior; after foaming is finished, the thin-wall part is machined, and the soft supporting material is taken out together with the isolation layer after machining is finished; the soft supporting material with good fluidity is adopted, the soft supporting material can be perfectly attached to the shape of the part after being expanded, the problem that the machining quality is affected due to the fact that the rigidity of the part is poor and vibration is generated on the surface can be well solved, and the machining efficiency can be greatly improved through the soft supporting material.

Description

Technical Field

[0001] The invention belongs to the technical field of thin-walled parts processing, and relates to a foaming soft support filling and vibration-proof method for thin-walled parts. Background Art

[0002] In the processing of thin-walled hollow parts with weak rigidity, due to the thin wall, when processing one side and then the other side, vibration will occur due to the large surface area and thin wall of the parts, thus affecting the surface roughness and precision requirements of the parts. In traditional processing, the filling materials used are generally gypsum and foam. After gypsum filling, the weight of the gypsum is several times or even dozens of times that of the parts, resulting in overweight parts. Flipping and clamping have a particularly large impact on the parts, and the precision of the parts is difficult to control. The foam is manually cut into similar shapes and then filled, and the contact area with the parts fluctuates. There are many uncertain factors, resulting in unstable processing. This is a problem that has always plagued milling of thin-walled hollow parts. How to find a material to solve this support problem is a thorny problem. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and proposes a method for anti-vibration of thin-walled parts by foaming soft support filling; the present invention is achieved through the following technical solutions: A method for anti-vibration of thin-walled parts by foaming soft support filling, comprising the following steps: S1. Mixing isocyanate and combined polyether to form a soft support material; S2. Laying an isolation layer on the inner wall of the thin-walled part to be processed; S3, pouring the soft support material into the thin-walled part to be processed; S4, waiting for the soft support material to foam and support the thin-walled parts to be processed from the inside; S5. After the foaming is completed, the thin-walled parts are processed, and after the processing is completed, the soft support material is taken out together with the isolation layer.

[0004] Preferably, the raw material of the soft supporting material also includes a flame retardant.

[0005] Preferably, the mass ratio of the raw materials is isocyanate:combined polyether:flame retardant is 8-12:6-8:2-4.

[0006] More preferably, the mass ratio of the raw materials is isocyanate:combined polyether:flame retardant is 10:7:3.

[0007] Preferably, the isolation layer is butter paper.

[0008] Better yet, place some 0.07mm thick butter paper under the thin-walled part and press it with your hands to make the butter paper fit the inner surface of the thin-walled part completely.

[0009] Preferably, the stirring time in step S1 is 2 to 3 minutes.

[0010] Preferably, after the soft support material is foamed, it is allowed to solidify for 25 to 40 minutes.

[0011] Preferably, after solidification is completed, the soft support material protruding from the upper surface of the thin-walled part is flattened.

[0012] Preferably, the volume of the soft support material to be poured into the thin-walled part is calculated according to the expansion coefficient of the soft support material.

[0013] The beneficial effects of the present invention compared with the prior art are as follows: The method of the present invention is suitable for processing parts with a wall thickness of less than 3 mm, and can effectively eliminate processing vibration; the processing efficiency is improved by 3 times compared with the original unsupported processing; the method of the present invention can be applied to thin-wall processing of various shapes; Due to different raw material ratios, the elastic coefficients of the supporting materials after foaming are different. This ratio can well guarantee the shape of the parts and ensure a certain elasticity of the supporting materials. Compared with traditional gypsum supporting materials, its weight is less than 1 / 100 of gypsum.

[0014] The present invention uses polyurethane foaming to fill and support thin-walled metal parts; after polyurethane foaming, it has the characteristics of vibration reduction, waterproofness, good elasticity, light weight, etc. The key is that the mixed raw materials are liquid and have good fluidity. After expansion, they can perfectly fit the shape of the parts, which can well solve the problem of poor rigidity of parts and vibration on the surface, thereby affecting the processing quality. Through this soft support material, the processing efficiency can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a picture of the original liquid being poured into the parts wrapped in butter paper in the embodiment; Figure 2 This is a picture of the thin-walled part after processing under support in the embodiment. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0017] Example 1 This embodiment provides a method for anti-vibration by foaming soft supports and filling thin-walled parts, which specifically includes the following steps: S1. Preparation of soft support material: isocyanate (black material) and combined polyether (white material) are mixed in a certain ratio, and then a flame retardant is added to obtain the required soft support material. In this embodiment, the raw material mass ratio is black material: white material: flame retardant = 10:7:3; the flame retardant is a phosphorus-based or halogen-based flame retardant; S2, pouring the prepared soft support material into a container and stirring it thoroughly. The stirring time used in this embodiment is 2 minutes; S3. To prevent the soft support material from sticking to the parts, place 0.07mm thick butter paper on the parts that need support, and press with your hands to make the butter paper fit the inner wall of the parts completely. S4. Calculate the volume to be poured according to the original liquid with a ratio of 10:7:3 and an expansion coefficient of 110 times. Pour the soft support material (liquid polyurethane) after stirring into the part cavity to be filled. It should be noted that excessive pouring should be avoided. After foaming, it will flow to the surface of the part and needs to be scraped off to prevent damage to the surface of the workpiece. S5. It takes about 5 minutes for the polyurethane to foam. After solidification for 30 minutes, the polyurethane foam that protrudes above the surface of the part should be cut off and flattened with a blade. It is best to protrude about 0.5mm above the surface of the part. After the part is pressed, there is an elasticity that can make good contact with the surface of the part. Through this support, the problem of poor rigidity of the part and surface vibration, which affects the processing quality, can be completely solved. Through this support, the processing efficiency can be greatly improved.

[0018] The same thin-walled parts are directly processed without support as a reference for comparison. The comparison data is shown in Table 1: It can be seen from the table that the vibration processing problem of thin-walled parts is solved through the design and use of soft supports. Compared with no support, the processing efficiency is high and the stability is good.

[0019] Example 2 This embodiment proposes a method for anti-vibration of thin-walled parts by foaming soft support filling, which is different from Embodiment 1 in that the ratio of black material: white material: flame retardant is 12:8:3; the rest is the same as Embodiment 1.

[0020] Example 3 This embodiment proposes a method for anti-vibration of thin-walled parts by foaming soft support filling, which is different from Embodiment 1 in that the ratio of black material: white material: flame retardant is 8:6:2; the rest is the same as Embodiment 1.

[0021] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A method for anti-vibration of thin-walled parts by foaming soft support filling, characterized in that: The following steps are involved: S1. Mixing isocyanate and combined polyether to form a soft support material; S2. Laying an isolation layer on the inner wall of the thin-walled part to be processed; S3, pouring the soft support material into the thin-walled part to be processed; S4, waiting for the soft support material to foam and support the thin-walled parts to be processed from the inside; S5. After the foaming is completed, the thin-walled parts are processed, and after the processing is completed, the soft support material is taken out together with the isolation layer.

2. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 1, characterized in that: The raw materials of the soft supporting material also include a flame retardant.

3. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 2, characterized in that: The mass ratio of the raw materials is isocyanate: combined polyether: flame retardant is 8~12:6~8:2~4.

4. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 3, characterized in that: The mass ratio of the raw materials is isocyanate: combined polyether: flame retardant is 10:7:

3.

5. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 1, characterized in that: The isolation layer is butter paper.

6. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 5, characterized in that: Place a piece of 0.07mm thick butter paper on the surface and press it with your hands to make the butter paper fit the inner surface of the thin-walled part completely.

7. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 1, characterized in that: The stirring time in step S1 is 2 to 3 minutes.

8. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 1, characterized in that: After the soft support material has finished foaming, wait for it to solidify for 25 to 40 minutes.

9. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 8, characterized in that: After solidification is complete, the soft support material protruding from the upper surface of the thin-walled part is flattened.

10. A method for anti-vibration of thin-walled parts by foaming soft support filling according to claim 1, characterized in that: Calculate the volume of soft support material to be poured into the thin-walled part based on the expansion coefficient of the soft support material.

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