CN111941002A

CN111941002A - Production process of automobile compressor bracket bushing

Info

Publication number: CN111941002A
Application number: CN202010668065.9A
Authority: CN
Inventors: 邱圣南; 曹徐江; 吴飞; 刘晶晶; 徐锡俐
Original assignee: Hongbang Die Casting Nantong Co ltd
Current assignee: Hongbang Die Casting Nantong Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-11-17

Abstract

The invention discloses a production process of a support bushing of an automobile compressor, which comprises the following steps of: mold closing → filling die casting → mold opening → slide block opening → manipulator taking part → spray blowing → repeating the steps; post-processing: removing residue at a water gap of the slag ladle and performing surface shot blasting treatment; machining: phi 31 milling cutter processing roughing → phi 31 reamer finishing → phi 31 reverse side and chamfer reverse milling cutter processing. According to the invention, the pull-out force of the bush is improved by improving the machining assembly holes and reducing the phenomenon of flange overflow during the press mounting of the bush, so that the vibration test capability is improved, and the safety of the whole vehicle is further improved.

Description

Production process of automobile compressor bracket bushing

Technical Field

The invention relates to a production process of a support bushing of an automobile compressor.

Background

The automobile compressor support mainly provides sufficient air circuit pressure for an automobile braking system so as to ensure the safety and reliability of the automobile braking system. Because the air compressor is in a severe working environment with violent vibration, the reliability of the compressor bracket directly influences the performance of the whole engine and even the whole vehicle.

The bush and the mounting hole are in interference fit, and in the press fitting process, because the included angle between the chamfer of the machined assembling hole and the inner wall is too sharp, when the bush is assembled by the heated bush, the flange edge of the bush is easy to overflow, and the drawing force test is unqualified. If the pull-out force test of the bushing is unqualified, the pull-out force test and the vibration test are influenced to a certain degree, and the performance and the driving safety of the whole vehicle are also influenced.

Disclosure of Invention

The invention aims to provide a production process of a bracket bushing of an automobile compressor, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a production process of an automobile compressor bracket bushing comprises the following specific steps:

A. die casting:

a. die assembly: the dynamic die, the static die and the forming auxiliary mechanism of the die are simultaneously in a closed working form of the die casting machine;

d. filling and die casting: the process that the aluminum alloy liquid metal enters the die cavity body under the action of high pressure and high speed;

c. opening the mold: the working form that the dynamic die, the static die and the forming auxiliary mechanism of the die are opened on the die-casting machine simultaneously is as follows:

d. taking a piece by a manipulator: an automatic mechanical arm is used for replacing the work form of manual workpiece taking;

e. spraying and blowing: the surface of the die is sprayed in the die-casting process so as to realize an operation mode that a product is well separated from a parent body;

B. post-processing: removing residue at a water gap of the slag ladle and performing surface shot blasting treatment;

C. machining: roughly machining the assembly hole of the bushing by adopting a phi 31 milling cutter; finish machining the assembly hole by adopting a phi 31 reamer; and (3) machining the assembly hole by adopting a phi 31 reverse milling cutter, and increasing the transition between the chamfer angle of the assembly hole and the inner wall.

The invention is further improved in that: the high pressure in step d is 800 +/-100 bar, and the high speed is 3.0 +/-0.5 m/s.

The invention is further improved in that: the spraying step in the step e is as follows: carrying out primary spraying on the surface of the mould, wherein the primary spraying time is 2s +/-2 s, then blowing for 2-3 times, then carrying out secondary spraying, wherein the secondary spraying time is 2.5s +/-2 s, and finally blowing for 2-3 times.

The invention is further improved in that: and C, the rotating speed of rough machining in the step C is 5000s/min, and the feeding amount is 2000 mm/min.

The invention is further improved in that: the rotation speed of the finish machining in the step C is 4500s/min, and the feed rate is 1000 mm/min.

The invention is further improved in that: and C, the rotating speed of the reprocessing of the chamfer reverse milling cutter in the step C is 4500s/min, and the feed rate is 2000 mm/min.

The invention is further improved in that: the reverse milling cutter insert is added with a chamfer R, R =1.5 mm.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the pull-out force of the bush is improved by improving the machining assembly holes and reducing the phenomenon of flange overflow during the press mounting of the bush, so that the vibration test capability is improved, and the safety of the whole vehicle is further improved.

Drawings

FIG. 1 is a schematic structural view of a reverse milling cutter;

fig. 2 is an enlarged view of a point a in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment provides a technical scheme: a production process of an automobile compressor bracket bushing comprises the following specific steps:

A. die casting:

d. filling and die casting: the process that the aluminum alloy liquid metal enters the die cavity body under the action of high pressure and high speed, wherein the high pressure is 800 +/-100 bar, and the high speed is 3.0 +/-0.5 m/s;

e. spraying and blowing: the die casting process is used for spraying the surface of the die to realize an operation mode that a product is well separated from a matrix, and the spraying step is as follows: carrying out primary spraying on the surface of the mould, wherein the primary spraying time is 2s +/-2 s, then blowing for 2-3 times, then carrying out secondary spraying, wherein the secondary spraying time is 2.5s +/-2 s, and finally blowing for 2-3 times;

C. machining: adopting a phi 31 milling cutter to carry out rough machining on the assembly hole of the bushing, wherein the rotating speed of the rough machining is 5000s/min, and the feeding amount is 2000 mm/min; finish machining is carried out on the assembly hole by adopting a phi 31 reamer, the finish machining rotating speed is 4500s/min, and the feeding amount is 1000 mm/min; and (3) machining the assembly hole by adopting a phi 31 chamfer reverse milling cutter, wherein the rotating speed of the reverse milling cutter for machining is 4500s/min, and the feed rate is 2000 mm/min. The chamfer R is added to the anti-milling cutter blade, R =1.5mm, and the transition between the chamfer of the assembly hole and the inner wall can be increased, and the anti-milling cutter is structured as shown in figures 1 and 2.

The bushing press fitting step is as follows: the lining is placed into an oven to be heated, and the heating temperature is 57 +/-2 degrees; manually clamping a product (pressing a positioning column); taking out the bushing from the oven and placing the bushing in a press-fitting position; automatic press fitting of equipment: the pressure head moves down and compresses tightly 3s + compresses tightly and keeps carrying 4s + pressure head and moves back 3s, and the pressure equipment power control: the process displacement interval is 4-5 mm, the pressure is 1.5 KG-4.5 KG, and the tail displacement interval is 11-13 mm in press mounting; the equipment sensor automatically detects the positive and negative of the lining, and if the lining is NG, the equipment gives an alarm; F. and taking out the product. The requirement of drawing force can be ensured only by improving the press-fitting link and ensuring that the flange edge of the lining does not overflow.

According to the invention, the R angle is added to the original reverse milling cutter blade, the transition between the machined hole chamfer and the inner wall is increased, the interference fit of the bushing during press mounting is further improved, the bushing-free flange is ensured to overflow, and the pull-out force is increased.

The post-alteration pull force test data is given in the following table (all pass):

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The production process of the automobile compressor bracket bushing is characterized in that: the method comprises the following specific steps:

A. die casting:

2. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: the high pressure in the step d is 800 +/-100 bar, and the high speed is 3.0 +/-0.5 m/s.

3. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: the spraying step in the step e is as follows: carrying out primary spraying on the surface of the mould, wherein the primary spraying time is 2s +/-2 s, then blowing for 2-3 times, then carrying out secondary spraying, wherein the secondary spraying time is 2.5s +/-2 s, and finally blowing for 2-3 times.

4. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: and C, the rotating speed of rough machining in the step C is 5000s/min, and the feeding amount is 2000 mm/min.

5. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: the rotation speed of finish machining in the step C is 4500s/min, and the feed rate is 1000 mm/min.

6. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: and C, the rotating speed of the reprocessing of the chamfer reverse milling cutter in the step C is 4500s/min, and the feed rate is 2000 mm/min.

7. The process for producing an automotive compressor bracket bushing according to claim 1, wherein: the reverse milling cutter blade increases the angle R, R =1.5 mm.