Bushing press fitting in machining mode

Abstract

The invention discloses a bushing press fitting in a machining mode, the bushing press fitting in the machining mode is used for machining a die casting, the bushing press fitting in the machining mode comprises a machining pin and a finish machining part, the machining pin comprises an R-angle chamfering part and a draft inclined part, the outer surface of the draft inclined part is provided with an inclined surface, the small end of the draft inclined part faces the die casting, and the finish machining part is used for machining the die casting. The R-angle chamfering part is connected to the large end of the draft inclined part, the machining pin is used for machining an R-angle chamfer and an inclined inner wall face in a middle hole of the die casting, the finish machining part is used for machining a middle section in the middle hole of the die casting, and the length of the middle section is larger than or equal to 15 mm. In the machining process, only the middle section larger than or equal to 15 mm is machined, and the other parts are directly formed through the die with the inclination and the R-angle chamfer machined through the draft inclined part and the R-angle chamfer part, so that the machining allowance is reduced, the machining time is shortened, it is guaranteed that the bush is pressed smoothly, and the machining efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to a bushing press-fitting method. Background Art

[0002] At present, most die-castings with bushing press-fitting holes, whether straight holes or side holes, need to be processed by forming knives and R-angle chamfering knives during fine machining. When the bushing is press-fitted, it will cause press-fitting difficulties or press deviation, resulting in unqualified quality of the assembly. There are many reasons for this situation, including that the entire section of the press-fitting hole of the die-casting has no slope and is a right angle, and there is no guide when the bushing is press-fitted. Therefore, most die-castings will have press-fitting difficulties or press deviation during the press-fitting process. Although there are press-fitting machines and press-fitting jigs, press-fitting is still difficult and cannot be pressed into place well, which seriously affects product quality and efficiency. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and the present invention provides a bushing press-fitting processing method.

[0004] The present invention is achieved through the following technical solutions:

[0005] A bushing press-fitting method for processing die-castings, characterized in that the bushing press-fitting method includes a processing pin and a finishing component, the processing pin includes an R-angle chamfered portion and a draft bevel, the outer surface of the draft bevel has an inclined surface, the small end of the draft bevel faces the die-casting, the R-angle chamfered portion is connected to the large end of the draft bevel, the processing pin is used to process the R-angle chamfer and the inclined inner wall surface in the hole of the die-casting, the finishing component is used to process the middle section in the hole of the die-casting, and the length of the middle section is greater than or equal to 15 mm.

[0006] Furthermore, the inclination angle of the inclined surface is 2.5 degrees.

[0007] Furthermore, the number of the processing pins is two, and the two processing pins are respectively processed at two ends of the die casting.

[0008] Furthermore, the processing pin is a movable mold core pin.

[0009] Furthermore, the processed section and the non-processed section in the hole of the movable mold core pin must ensure consistent inclination.

[0010] Furthermore, the processing pin is a fixed mold core pin.

[0011] Furthermore, the processed section and the non-processed section in the hole of the fixed mold core pin must ensure consistent inclination.

[0012] Furthermore, the processing pin is a slider pin.

[0013] Furthermore, the processed section and the non-processed section in the hole of the slider pin must have consistent inclinations.

[0014] The beneficial effects of the present invention are:

[0015] In order to avoid the influence of product quality on the bushing caused by tilting and deflection or aluminum extrusion in the hole during the bushing press-fitting of the aluminum casting, the bushing press-fitting processing method of the present invention specifically processes only the middle section greater than or equal to 15 mm, and the remaining part is directly formed by the draft bevel and R-angle chamfered part through the mold with the slope and R-angle chamfer, thereby reducing the processing allowance, reducing the processing time, ensuring the smooth press-fitting of the bushing, and greatly improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the bushing press-fitting during processing according to the processing method of an embodiment of the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0018] Figure 3 Schematic diagram of the structure of the die casting according to an embodiment of the present invention.

[0019] Description of reference numerals:

[0020] Processing pin 1

[0021] R corner chamfered part 11

[0022] Draft angle 12

[0023] Die casting 10

[0024] Middle Section 101 DETAILED DESCRIPTION

[0025] The following descriptions of the embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention may be implemented.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, this embodiment discloses a processing method of bushing press-fitting, which is used to process the die-casting 10. The processing method of bushing press-fitting includes a processing pin 1 and a finishing component. The processing pin 1 includes an R-angle chamfered portion 11 and a draft bevel 12. The outer surface of the draft bevel 12 has an inclined surface. The small end of the draft bevel 12 faces the die-casting 10, and the R-angle chamfered portion 11 is connected to the large end of the draft bevel 12. The processing pin 1 is used to process the R-angle chamfer and the inclined inner wall surface in the hole of the die-casting 10, and the finishing component is used to process the middle section 101 in the hole of the die-casting 10. The length of the middle section 101 is greater than or equal to 15 mm.

[0027] The outer surface of the draft bevel 12 has an inclined surface, and the R-angle chamfered portion 11 is connected to the large end of the draft bevel 12. The draft angle is increased by the large end of the draft bevel 12 to ensure that the small end has sufficient processing allowance. During fine processing, only the middle section 101 is processed by the fine processing parts. In order to avoid the influence of the product quality on the inclined pressing deviation or the extrusion of aluminum in the hole during the press-fitting of the aluminum casting bushing, the bushing press-fitting of the processing method of the present invention, in particular, only the middle section 101 greater than or equal to 15mm is processed during processing, and the rest of the part is directly formed by the draft bevel 12 and the R-angle chamfered portion 11 with the inclined and R-angle chamfered mold, thereby reducing the processing allowance, reducing the processing time, ensuring the smooth press-fitting of the bushing, and greatly improving the processing efficiency.

[0028] There are two processing pins 1, and the two processing pins 1 are processed at both ends of the die casting 10. The specific embodiment can be seen, but the present invention is not limited to the structure of the embodiment. The hole is split in half and the draft angle is increased. The draft starting point is at both ends of the processing area (the processing area adds material and the non-processing area reduces material). The size of the slope depends on the processing allowance.

[0029] When the mold is opened, first ensure that the dimensions of both ends of the die-cast blank are consistent with the processing dimensions, split the hole in half and increase the draft angle. The draft starting point is at both ends of the processing area (add material in the processing area and reduce material in the non-processing area), and the size of the slope depends on the processing allowance. In this embodiment, the inclination angle of the inclined surface is 2.5 degrees. According to calculations, increasing the demoulding slope by 2.5° on one side can increase the maximum area processing allowance (the small end of the die-cast blank hole) by 0.3mm on one side. The large end R angle chamfering mold is made, so that the middle section 101 can be processed during the fine processing. The bushing press-fitting of the processing method of the present invention only processes the middle section 101 of the press-fitting hole. By setting the slope of the draft bevel 12 in the processing pin 1, the processing allowance is reduced, the processing time is reduced, and the processing efficiency is improved.

[0030] The processing pin 1 can be a movable die core pin. The processing section and the non-processing section in the hole of the movable die core pin must ensure the same slope.

[0031] The processing pin 1 can be a fixed die core pin. The processing section and the non-processing section in the hole of the fixed die core pin need to ensure the same slope.

[0032] The processing pin 1 can be a slider pin. The processing section and the non-processing section in the hole of the slider pin need to ensure the same slope.

[0033] Due to the product assembly relationship, the middle section 101 of the die-casting 10 needs to be a straight surface, and the straight surface is guaranteed after processing. When making the mold, it is necessary to ensure that there is no step in the hole after processing. In order to ensure that there is no step in the hole after processing, the processing section and the non-processing section in the blank hole must ensure the same slope (to ensure the appearance). After the hole is processed to the required size in the drawing, the height of the processing section must be guaranteed to be ≦15mm (to ensure the size). First, ensure that the dimensions of both ends of the blank are consistent with the processing dimensions, split the hole in half and increase the draft angle. The draft starting point is the two ends of the processing area (add material in the processing area and reduce material in the non-processing area). The size of the slope depends on the processing allowance. According to calculations, increasing the demoulding angle by 2.5° on one side can increase the maximum area processing allowance (small end of the blank hole) by 0.3mm on one side. Therefore, the R-angle chamfered portion 11 is molded, the inclination of the large end of the draft bevel 12 is adjusted according to the drawing size and the processing section size, and a processing allowance is left at the small end of the draft bevel 12. The middle section 101 is finely processed by fine-machining the parts, and the middle section 101 is ≥15mm.

[0034] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A bushing press-fitting method for processing die castings, characterized in that: The bushing press-fitting of the processing method includes a processing pin and a finishing component, the processing pin includes an R-angle chamfered portion and a draft bevel, the outer surface of the draft bevel has an inclined surface, the small end of the draft bevel faces the die-casting, and the R-angle chamfered portion is connected to the large end of the draft bevel. The processing pin is used to process the R-angle chamfer and the inclined inner wall surface in the hole of the die-casting, and the finishing component is used to process the middle section in the hole of the die-casting, and the length of the middle section is greater than or equal to 15 mm.

2. The bushing press-fitting method according to claim 1 is characterized in that: The inclined surface has an inclination angle of 2.5 degrees.

3. The bushing press-fitting method according to claim 1 is characterized in that: The number of the processing pins is two, and the two processing pins are respectively processed at two ends of the die casting.

4. The bushing press-fitting method according to claim 1 is characterized in that: The processing pin is a movable mold core pin.

5. The bushing press-fitting method according to claim 4 is characterized in that: The processed section and the non-processed section in the hole of the movable die core pin must ensure that the inclination is consistent.

6. The bushing press-fitting method according to claim 1 is characterized in that: The processing pin is a fixed mold core pin.

7. The bushing press-fitting method according to claim 6 is characterized in that: The processed section and the non-processed section in the hole of the fixed die core pin must ensure that the slope is consistent.

8. The bushing press-fitting method according to claim 1 is characterized in that: The processed pin is a slider pin.

9. The bushing press-fitting method according to claim 8, characterized in that: The processed section and the non-processed section in the hole of the slider pin must have the same slope.

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