Electric fuel pump impeller processing technology

Abstract

The present invention discloses a processing technology for an electric fuel pump impeller, comprising the following steps: S1: injection molding; S2: aging treatment; S3: rough grinding; S4: fine grinding; S5: cleaning and drying; S6: sandblasting; S7: cleaning and drying. The sandblasting process is added to disperse the concentrated stress on the surface, so that the stress on the impeller surface can be effectively and evenly released, thereby avoiding the uneven swelling of the impeller during use, improving the uneven change of the impeller during use, and further improving the stability of the impeller during use.

Description

Technical Field

[0001] The invention belongs to the technical field of processing and manufacturing pump cores of automobile and motorcycle fuel pumps, and in particular relates to a processing technology for an impeller of an electric fuel pump. Background Art

[0002] In the prior art, the processing steps of the fuel pump impeller are: injection molding - aging treatment - rough grinding - fine grinding - cleaning and drying, wherein the aging treatment is used to remove surface stress, and the commonly used method for aging treatment is heating and baking. When the above process is used, due to the uneven temperature in the baking equipment, some stress on the impeller surface cannot be removed, causing the rotation balance of the impeller itself to change, and the foam oil will swell unevenly during use, resulting in differences in the performance of the fuel pump core, and unstable noise with a large decibel amplitude. Summary of the invention

[0003] The present invention proposes a processing technology for an electric fuel pump impeller, which can evenly release the stress on the impeller surface.

[0004] To this end, the technical solution adopted by the present invention is: a process for processing an electric fuel pump impeller, comprising the following steps:

[0005] S1: Injection molding, injecting the raw material into the mold and taking it out after cooling;

[0006] S2: Aging treatment, putting it into baking equipment for baking, and after baking, naturally cooling it with air;

[0007] S3: Rough grinding, using rough grinding equipment to perform initial grinding on the impeller surface;

[0008] S4: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time;

[0009] S5: cleaning and drying: cleaning with cleaning oil and drying after cleaning;

[0010] S6: plane sandblasting, the front and back sides of the impeller are sandblasted once each by a plane sandblasting machine;

[0011] S7: Cleaning and drying: Cleaning is performed by a cleaning device, and drying is performed after cleaning is completed.

[0012] As a preferred embodiment of the above scheme, the following steps are also included:

[0013] S8: Micro-fine grinding, placing the impeller after sandblasting into the plane micro-fine grinding equipment for micro-fine grinding;

[0014] S9: Cleaning and drying: Cleaning is performed by a cleaning device and drying is performed after cleaning is completed.

[0015] More preferably, 100-mesh sand is used for sand blasting in S6.

[0016] More preferably, the aging temperature in S2 is 180-185° C., and the aging time is four hours.

[0017] Further preferably, the water sandblasting automatic cleaning equipment is used for cleaning in S7, which specifically includes the following steps: low-frequency ultrasonic rough cleaning, two low-frequency ultrasonic fine cleanings, circulating water flushing, high-frequency swishing fine cleaning, high-frequency ultrasonic fine cleaning and circulating wind shear drying, wherein each washing time is between 500-700s, the temperature is between -5-25°C, the drying time is between 200-300s, and the temperature is between 60-80°C. Due to the long cleaning time, the impeller will swell if there is stress during the cleaning process, so that the surface stress release of the impeller can be judged directly by detecting the surface appearance of the impeller after cleaning.

[0018] The beneficial effects of the present invention are as follows: the sandblasting process is added to disperse the concentrated surface stress, so that the stress on the impeller surface can be effectively and evenly released, thereby avoiding uneven swelling of the impeller during use, that is, avoiding bulges on the surface volume of the impeller, improving the uneven changes of the impeller during use, and thus improving the stability of the impeller during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a process flow chart of Example 1 in the present invention.

[0020] Figure 2 It is a schematic diagram of the specific detection positions of the five-point method in the present invention.

[0021] Figure 3 This is an example diagram of the five-point microscopic detection in the present invention.

[0022] Figure 4 This is a comparison diagram of the detection position 1 after using Example 3, Example 4 and the comparative example in the present invention.

[0023] Figure 5 This is a comparison diagram of the detection position 2 after using Example 3, Example 4 and the comparative example in the present invention.

[0024] Figure 6 This is a comparison diagram of the detection position 3 after using Example 3, Example 4 and the comparative example in the present invention.

[0025] Figure 7 It is a comparison diagram of the detection position 4 after using Example 3, Example 4 and the comparative example in the present invention.

[0026] Figure 8 This is a comparison diagram of the detection position 5 after using Example 3, Example 4 and the comparative example in the present invention.

[0027] Fig. 9 It is a schematic diagram of the location of the impeller thickness detection point in the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0029] Example 1

[0030] like Figure 1 As shown, a process for processing an electric fuel pump impeller mainly includes the following steps:

[0031] The first step: injection molding, injecting the raw materials into the mold and taking them out after cooling;

[0032] The second step: aging treatment, put it into the baking equipment for baking, and after baking, cool it naturally with air;

[0033] Step 3: Rough grinding: use rough grinding equipment to grind the impeller surface for the first time;

[0034] Step 4: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time;

[0035] Step 5: Cleaning and drying: Cleaning is done by cleaning equipment and drying is done after cleaning;

[0036] Step 6: Plane sandblasting: sandblast the impeller surface with sandblasting equipment, and both the front and back sides are sandblasted;

[0037] Step 7: Cleaning and drying: Cleaning is done by a cleaning device, and drying is done after cleaning. The cleaning device uses a water sandblasting automatic cleaning device;

[0038] Step 8: Micro-fine grinding: put the impeller after sandblasting into the plane micro-fine grinding equipment for micro-fine grinding;

[0039] Step 9: Cleaning and drying. Clean with cleaning equipment and dry after cleaning.

[0040] In the second step, the aging temperature in S2 is 180-185°C, and the aging time is four hours. In the sixth step, the sand blasting is performed using 100-mesh sand particles, and the sand blasting pressure is 0.2MPa, and the sand blasting time for each side is 2-3min.

[0041] Example 2

[0042] A process for processing an electric fuel pump impeller mainly comprises the following steps:

[0043] The first step: injection molding, injecting the raw materials into the mold and taking them out after cooling;

[0044] The second step: aging treatment, put it into the baking equipment for baking, and after baking, cool it naturally with air;

[0045] Step 3: Rough grinding: use rough grinding equipment to grind the impeller surface for the first time;

[0046] Step 4: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time;

[0047] Step 5: Cleaning and drying: Cleaning is done by cleaning equipment and drying is done after cleaning;

[0048] Step 6: Plane sandblasting: sandblast the impeller surface with sandblasting equipment, and both the front and back sides are sandblasted;

[0049] Step 7: Cleaning and drying: Cleaning is done by a cleaning device, and drying is done after cleaning. The cleaning device uses a water sandblasting automatic cleaning device;

[0050] In the second step, the aging temperature in S2 is 180-185°C, and the aging time is four hours. In the sixth step, the sand blasting is performed using 100-mesh sand particles, and the sand blasting pressure is 0.2MPa, and the sand blasting time for each side is 2-3min.

[0051] Comparative Example 1

[0052] A process for processing an electric fuel pump impeller mainly comprises the following steps:

[0053] The first step: injection molding, injecting the raw materials into the mold and taking them out after cooling;

[0054] The second step: aging treatment, put it into the baking equipment for baking, and after baking, cool it naturally with air;

[0055] Step 3: Plane sandblasting: Use a plane sandblasting machine to sandblast the front and back sides of the impeller once each;

[0056] Step 4: Cleaning and drying. Cleaning is done by cleaning equipment and drying is done after cleaning. The cleaning equipment uses water sandblasting automatic cleaning equipment.

[0057] Step 5: Rough grinding: use rough grinding equipment to perform initial grinding on the impeller surface;

[0058] Step 6: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time;

[0059] Step 7: Plane sandblasting: Use a plane sandblasting machine to sandblast the front and back sides of the impeller once each;

[0060] Step 8: Cleaning and drying. Cleaning is carried out through cleaning equipment, and drying is completed after cleaning. The cleaning equipment adopts water sandblasting automatic cleaning equipment.

[0061] In the second step, the aging temperature in S2 is 180-185°C, the aging time is four hours, and the sandblasting pressure is 0.1-0.14MPa for 3-4min each time.

[0062] Comparative Example 2

[0063] A process for processing an electric fuel pump impeller mainly comprises the following steps:

[0064] The first step: injection molding, injecting the raw materials into the mold and taking them out after cooling;

[0065] The second step: aging treatment, put it into the baking equipment for baking, and after baking, cool it naturally with air;

[0066] Step 3: Rough grinding: use rough grinding equipment to grind the impeller surface for the first time;

[0067] Step 4: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time;

[0068] Step 5: Cleaning and drying. Clean with cleaning equipment and dry after cleaning.

[0069] In the second step, the aging temperature in S2 is 180-185°C and the aging time is four hours.

[0070] The same mold is used in Example 1, Example 2, Comparative Example 1 and Comparative Example 2.

[0071] The impellers were processed by using the processes of Example 1, Example 2, Comparative Example 1 and Comparative Example 2, and 200 impellers were processed by each process. The processed impellers were compared. The specific comparison items are as follows:

[0072] 1. Randomly select 5 impellers processed by the process of Example 2, Comparative Example 1 and Comparative Example 2, take photos and compare them under a microscope using the five-point method, and detect the roughness at the same time, record the data, and the photo comparison results are as follows: Figure 4-Figure 8 As shown, the results are as follows: the surface of comparative example 1 has no obvious burrs and meets the requirements; the surface of embodiment 2 has fine burrs and meets the requirements; the surface of comparative example 2 has obvious burrs, that is, the burrs of the impeller after sandblasting, cleaning and drying are significantly less than those without sandblasting treatment, and the surface effect is good. At the same time, the burrs of the impeller after two sandblasting, cleaning and drying are significantly less than those after one sandblasting treatment, and the surface effect is better. Therefore, after sandblasting, the stress on the impeller surface can be effectively released.

[0073] The roughness results of the test are shown in Table 1:

[0074] Table 1 Roughness of Example 2, Comparative Example 1 and Comparative Example 2

[0075]

[0076]

[0077] From Table 1, it can be seen that the sandblasting process has an effect on the roughness of the impeller, but the secondary sandblasting will not significantly increase the roughness of the impeller.

[0078] 2. Randomly select 5 impellers processed by the process of Example 2 and Comparative Example 1, and test them to confirm the surface burr removal status. It is found that the surface effect is good and no obvious burrs are found. Whether it is flat sandblasting or dry sandblasting, the stress on the impeller surface can be effectively released.

[0079] At the same time, all the impellers processed by the processes of Example 2 and Comparative Example 1 were subjected to appearance inspection, defective products with dents were detected, and the number of unqualified products was recorded. It was found that the defective rate of the impellers after adopting the process of Example 1 was 3.5%, while the defective rate of the comparative example was 7%. In addition, the defective products of Example 1 were concentrated on surface scratches, while the defective products of Comparative Example 1 were concentrated on blade defects. Therefore, combined with the previous test results, it is best to use a single plane sandblasting.

[0080] 3. Randomly select 25 impellers processed by the process of Example 1 and Example 2, and confirm their dimensions. There are 8 detection points, such as Fig. 9 As shown, the thickness of the test point is measured using an outside micrometer. The test results are shown in Table 2 and Table 3:

[0081] Table 2 Impeller dimensions using the process of Example 1

[0082]

[0083]

[0084] Table 3 Impeller dimensions using the process of Example 2

[0085]

[0086]

[0087] From Table 2 and Table 3, it can be seen that after plane micro-grinding, the dimensional deviation of the impeller surface is smaller, which improves the flatness of the impeller surface and makes the impeller more wear-resistant.

[0088] The role of aging treatment is to preliminarily release the stress on the impeller surface. From the above test results, it can be obtained that the uncompleted stress of the impeller is released evenly and effectively through sandblasting, thereby avoiding uneven swelling of the impeller during use, improving the uneven changes of the impeller during use, and thus improving the stability of the impeller during use. Since the release of the stress will cause the impeller surface structure to be relatively loose, that is, the dimensional deviation of the impeller thickness will be relatively large and the surface will be rough, the surface micro-grinding is added. After the surface micro-grinding, the flatness of the impeller surface is improved, making the impeller more stable and efficient during use, while also increasing the wear resistance of the impeller and improving the service life of the impeller.

Claims

1. A process for processing an electric fuel pump impeller, characterized in that: The steps include: S1: Injection molding, injecting the raw material into the mold and taking it out after cooling; S2: Aging treatment, putting it into baking equipment for baking, and after baking, naturally cooling it with air; S3: Rough grinding, using rough grinding equipment to perform initial grinding on the impeller surface; S4: Fine grinding: use fine grinding equipment to grind the impeller surface for the second time; S5: cleaning and drying: cleaning is performed by a cleaning device, and then drying is performed after cleaning; S6: plane sandblasting, the front and back sides of the impeller are sandblasted once each by a plane sandblasting machine; S7: cleaning and drying, cleaning is performed by a cleaning device, and drying is performed after cleaning, wherein the cleaning device is an automatic water sandblasting cleaning device, and includes the following steps: Low-frequency ultrasonic rough cleaning, two low-frequency ultrasonic fine cleaning, circulating water flushing, high-frequency tumbling fine cleaning, high-frequency ultrasonic fine cleaning and circulating air cutting drying, where each washing time is between 500-700s, the temperature is between -5-25℃, the drying time is between 200-300s, and the temperature is between 60-80℃; S8: Micro-fine grinding, placing the impeller after sandblasting into the plane micro-fine grinding equipment for micro-fine grinding; S9: Cleaning and drying: Cleaning is performed by a cleaning device and drying is performed after cleaning is completed.

2. The electric fuel pump impeller processing technology according to claim 1 is characterized in that: In the S6, sand particles with a mesh size of 100 are used for sand blasting.

3. The electric fuel pump impeller processing technology according to claim 1 is characterized in that: The aging temperature in S2 is 180-185° C., and the aging time is four hours.

Images