Automobile air conditioner aluminum pipe sleeve machining method

Abstract

The invention relates to the technical field of air conditioner aluminum pipe sleeve preparation methods, in particular to an automobile air conditioner aluminum pipe sleeve machining method, which adopts an advanced multi-station cold heading forming machine and performs continuous machining through a repeatedly researched and developed cold heading process. A raw material is a ton-weight aluminum round bar tree, firstly, the bar is fed into a cold heading forming machine to be subjected to pretreatment such as straightening and cutting, then, the bar is fed into a first station to be subjected to part forming example angle preforming, then, forming such as positioning, vacuumizing and perforating of a sleeve is completed step by step at a subsequent station, and special die design is adopted for manufacturing the sleeve. The precision and strength of the product are ensured, and meanwhile, the quality stability of the product is ensured by accurately controlling parameters such as pressure, building degree and oil quantity in the cold heading process.

Description

Technical Field

[0001] The invention relates to the technical field of methods for preparing an aluminum tube sleeve for an air conditioner, and in particular to a method for processing an aluminum tube sleeve for an automobile air conditioner. Background Art

[0002] At present, the processing process of air-conditioning aluminum tube sleeve uses aluminum rod as raw material, and the processing process is as follows: ① Cut Φ18 aluminum rod length: 36mm (leave 0.5mm finishing allowance at both ends); ② Rough machining of outer circle and inner hole size (leave 0.5mm finishing allowance); ③ CNC finishing of one end outer circle, plane, inner hole size and tapping; ④ Turn around and CNC machining of the other end outer circle, end face, inner hole size and tapping; ⑤ Cleaning, blowing, packing and storage. The traditional processing method has a large number of processing tools, high processing technology difficulty, and high technical requirements for operators. Due to the complex process, it is difficult to stably control product precision, the product qualification rate is low, and the material utilization rate is not high. Therefore, a new processing method is urgently needed to improve this. Summary of the invention

[0003] In view of the defects in the prior art, the present invention provides a method for processing an aluminum tube sleeve for an automobile air conditioner, which is characterized by comprising: using a ton-weight aluminum round bar blank as the raw material, using a multi-station intelligent cold heading machine to perform pre-treatment such as straightening and cutting the blank, the multi-station intelligent cold heading machine drives the blank to move, corrects the blank in the mold, straightens the blank to achieve a predetermined verticality, and cuts the blank;

[0004] Use a turning tool to pre-form the bottom chamfer of the aluminum tube sleeve blank, and then complete the sleeve positioning, evacuation, perforation and other forming operations;

[0005] The outer surface of the aluminum tube sleeve blank is finely processed to obtain a molded product, an air-conditioning aluminum tube sleeve;

[0006] Cleaning of molded products.

[0007] The specific steps of using a multi-station intelligent cold heading machine to stamp the blank include:

[0008] (1) The bar is straightened by extrusion inside the cold heading machine, and then the round aluminum rod wire is cut by the cooperation of the outer and inner cutters. The aluminum rod wire passes through the through hole of the inner cutter, and the notch 1-1 on the outer cutter cuts the aluminum rod wire to obtain a billet;

[0009] (2) Extruding the billet in the No. 1 die through a shaping punch to shape the billet;

[0010] (3) The blank of the 2# die is squeezed by the positioning punch, the blank is further shaped, and the bottom chamfer of the blank is regularized for preforming;

[0011] (4) The blank of the 3# die is squeezed by a stretching punch, the blank is stretched, a hole is opened at the large end of the blank, and a small hole is positioned;

[0012] (5) The blank of the 4# die is squeezed by the shaping groove punch, and the bottom chamfer of the blank is secondary regularized;

[0013] (6) Extruding the blank of die #5 through a shaping punch to evacuate the blank, including preforming the groove;

[0014] (7) The blank of the 6# die is squeezed by a forming punch, and the burrs on the edges of the grooves are squeezed inside the die to remove the burrs, and the blank is perforated.

[0015] As a preferred technical solution, the outer circular cutter and the inner circular cutter are installed on a movable cutting knife cylinder at the feed port of the multi-station intelligent cold heading machine.

[0016] As a preferred technical solution, the blank is placed in 1# to 6# molds in sequence through the clamps provided by the multi-station intelligent cold heading machine, and 1# to 6# molds are all molds that are disconnected from each other from top to bottom.

[0017] As a preferred technical solution, a tool for punching the holes in the blank is installed on a cold heading machine.

[0018] As a preferred technical solution, the finishing of the outer surface of the aluminum tube sleeve blank specifically includes: clamping and fixing the small hole end of the aluminum tube sleeve blank with the inner hole spring sleeve of the cold heading machine spindle, rough and fine turning the outer circle and end face of the large hole of the blank with an external cylindrical turning tool, chamfering one end of the large hole of the blank with an internal hole boring tool, moving to the second spindle through the clamp of the cold heading machine, clamping and fixing the large hole end of the blank with the inner hole sleeve of the cold heading machine spindle, turning around and rough and fine turning the end face and outer circle of the small hole end of the blank, milling a pre-hole at the small hole end of the blank with an alloy milling cutter, and enlarging the small hole at the small hole end of the blank with an internal hole boring tool.

[0019] As a preferred technical solution, cleaning the molded product specifically includes: using ultrasonic cleaning, controlling the pH of the cleaning liquid between 8 and 9, cleaning for 10 minutes, and after the alkaline water ultrasonic cleaning is completed, immersing the aluminum tube sleeve in clean water to remove the alkaline water on the surface of the aluminum tube sleeve, then blowing off the moisture on the surface of the aluminum tube sleeve, and finally placing it in a dryer for drying.

[0020] As a preferred technical solution, the model of the multi-station intelligent cold forging machine is 14B6S.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention uses the repeatedly developed cold heading process for continuous processing. The raw material is a ton of aluminum round bar tree. First, the bar is sent to the cold heading forming machine. After pre-treatment such as straightening and cutting, it is sent to the first station for pre-forming of the corners. Then, the positioning, evacuation, perforation and other forming of the sleeve are gradually completed in the subsequent stations. A special mold design is used for the sleeve to ensure the accuracy and strength of the product. At the same time, by accurately controlling the pressure, depth and oil volume in the cold heading process, the quality stability of the product is guaranteed. The unique mold technology and the unique cold heading mold are designed to improve the use of the mold. Life and product precision, for example, the most suitable mold material is used, and the tungsten steel inside the mold is vented by means of air holes, and the production is automated. The cold heading process is fully automated, including feeding, automatic oil throwing, etc., which greatly improves production efficiency and product quality. The cold heading process can make the metal structure of the aluminum sleeve denser, improve the strength and toughness of the product, and at the same time, the precise mold design and automated production ensure the consistency of product size and precision, reducing production costs. Compared with the traditional cutting process, the cold heading process greatly reduces the waste of raw materials and processing time, and reduces production costs. In addition, automated production can also reduce labor costs and management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0024] Figure 1 It is a schematic diagram of a structure of a circular external cutter in a top view of the present invention;

[0025] Figure 2 This is a schematic diagram of the top view of the structure of the molded product air conditioner aluminum tube sleeve of the present invention;

[0026] Figure 3 This is a schematic diagram of the planed surface structure of the air conditioner aluminum tube sleeve, a molded product of the present invention;

[0027] Figure 4 This is a schematic diagram of the 1# mold structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the 2# mold structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the 3# mold structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the 4# mold structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the 5# mold structure of the present invention;

[0032] Fig. 9 This is a schematic diagram of the 6# mold structure of the present invention;

[0033] Fig.10 This is a schematic diagram of the side structure of the molded product air conditioner aluminum tube sleeve of the present invention

[0034] Fig.11 This is a schematic diagram of the structure of the molded product air-conditioning aluminum tube sleeve of the present invention. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0037] The following is combined with Figures 1 to 10 The present invention is described in further detail:

[0038] Use multi-station intelligent cold heading machine to stamp the blank into shape. Figures 1 to 11 , firstly, a multi-station intelligent cold heading machine is selected. The multi-station intelligent cold heading machine is also called a cold extrusion forming machine. In this embodiment, the model of the multi-station intelligent cold forging machine is 14B6S, and then the outer circular knife and the inner circular knife are installed on the movable cutting knife cylinder at the feed port of the cold heading machine, and the 1#~6# molds are placed in the mold frame of the cold heading machine, and the mold frame is pressed and fixed to fix the mold; finally, the cold heading machine is started, and the motor of the cold heading machine drives the cam to drive the punch mechanism to move, and the punch squeezes the blank in the mold, so that the blank is deformed to a shape consistent with the shape of the mold, and blind holes and through holes are punched out inside the large hole end and the small hole end of the blank. After being stamped and formed by the 1#~6# molds, it finally becomes an aluminum tube sleeve blank, wherein the blank is placed in the mold through the clip provided by the cold heading machine, and the 1#~6# molds are all molds disconnected from each other from top to bottom. Exhaust is exhausted through the disconnected surface to avoid inflation during the stamping process, which is beneficial to the forming of the blank;

[0039] Use a turning tool to pre-form the bottom chamfer of the aluminum tube sleeve blank, and then complete the sleeve positioning, evacuation, perforation and other forming operations;

[0040] The outer surface of the aluminum tube sleeve blank is finely processed to obtain a molded product, an air-conditioning aluminum tube sleeve;

[0041] Cleaning of molded products.

[0042] Specifically, the multi-station intelligent cold heading machine punches the blank into shape, including the following steps:

[0043] (1) The φ27 round aluminum rod wire is cut by the cooperation of the outer and inner circular cutters. The aluminum rod wire passes through the through hole of the inner circular cutter, and the notch 1-1 on the outer circular cutter cuts the aluminum rod wire. Figure 1 As shown in the figure, it is a schematic diagram of the main structure of the circular outer knife. Figure 3 As shown, the blank is obtained as a schematic diagram of the inner knife structure; the blank cross-sectional diameter is φ27 and the blank length is 39.

[0044] (2) Clamp the blank with the clamp of the cold heading machine and put it into the No. 1 mold. Figure 4 The figure shows the schematic diagram of the structure of the 1# die. The blank in the 1# die is squeezed by a shaping punch to shape the blank so that the shape of the blank is adapted to the 1# die.

[0045] (3) The blank after shaping in step (2) is then placed into the 2# mold. Figure 5 As shown, it is a schematic diagram of the structure of the 2# die. The blank of the 2# die is squeezed by a shaping punch, and the blank is further shaped, the bottom chamfer is preformed, and the blank is regularized. The diameter A of the large end section of the blank is φ19.2, and the length E is 16;

[0046] (4) The blank after shaping in step (3) is then placed into the 3# mold. Figure 6 As shown, it is a schematic diagram of the structure of the 3# die, and the blank of the 3# die is squeezed by the positioning punch to shape and position the blank;

[0047] (5) After the shaping and positioning in step (4), the blank is placed in the 4# mold. Figure 7 As shown, it is a schematic diagram of the structure of the 4# die. The blank of the 4# die is stretched by stretching the punch rod, and the blank is stretched so that the bottom chamfer is formed;

[0048] (6) The blank stretched in step (5) is then placed in the 5# mold. Figure 8 As shown, the blank of the 5# die is squeezed by a shaping punch, the blank is stretched, the groove of the blank is evacuated, and then a small hole is positioned, and then the burrs on the edges of the groove of the blank are squeezed inside the die to remove the burrs;

[0049] (7) The blank stretched in step (6) is then placed in the 6# mold. Fig. 9 As shown, the blank of the 6# die is squeezed by a forming punch, the blank is pierced, the grooves and small holes in the blank are polished, and the size of the inner hole of the blank is re-compounded to ensure that the smoothness and concentricity of the inner hole meet the process requirements.

[0050] Specifically, the tool for punching the blind hole in the blank is installed on the cold heading machine:

[0051] Use a φ24.5 specification tool to extract the shell in the large hole at the large hole end of the blank. The extraction depth is 36. Continue to refer to the forming aluminum tube sleeve Fig.11 ,

[0052] Use a φ16 specification tool to make a through hole in the pre-hole inside the shell to make a complete penetration;

[0053] Specifically, the finishing of the outer surface of the aluminum tube sleeve blank includes:

[0054] Use the inner hole spring clamp of the cold heading machine spindle to clamp and fix the unextracted end of the aluminum tube sleeve blank, use the outer circle turning tool to rough and fine turn the outer circle and end face of the blank's shell-extracted end, use the inner hole boring tool to chamfer the groove of the blank's shell-extracted end, move it to the second spindle through the clamp of the cold heading machine, clamp and fix the blank's shell-extracted end with the inner hole clamp of the cold heading machine spindle, turn around and rough and fine turn the end face and outer circle of the blank's small hole end, use the alloy milling cutter to mill the small hole at the small end of the blank, and use the inner hole boring tool to enlarge the small hole at the small end of the blank;

[0055] Specifically, cleaning of molded products includes:

[0056] Ultrasonic cleaning is adopted, and the pH value of the cleaning liquid is controlled between 8 and 9. The cleaning is carried out for 10 minutes. After the alkaline ultrasonic cleaning is completed, the aluminum tube sleeve is immersed in clean water again to remove the alkaline water on the surface of the aluminum tube sleeve, and then the moisture on the surface of the aluminum tube sleeve is blown off, and finally the aluminum tube sleeve is placed in a dryer for drying.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for processing an aluminum tube sleeve for an automobile air conditioner, characterized in that: include: The raw materials are aluminum round bar blanks weighing tons. A multi-station intelligent cold heading machine is used to pre-treat the blanks by straightening and cutting. The multi-station intelligent cold heading machine drives the blanks to move, corrects the blanks in the mold, straightens the blanks, reaches the predetermined verticality, and cuts the blanks; the internal tool of the cold heading machine is used to pre-form the bottom chamfer of the aluminum tube sleeve blank, and then the positioning, evacuation, perforation and other forming operations of the sleeve are completed; the outer surface of the aluminum tube sleeve blank is fine-processed to obtain the formed product, the air-conditioning aluminum tube sleeve; and the formed product is cleaned.

2. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The specific steps of using a multi-station intelligent cold heading machine to stamp the blank include: (1) The bar is straightened by extrusion inside the cold heading machine, and then the round aluminum rod wire is cut by the cooperation of the outer and inner cutters. The aluminum rod wire passes through the through hole of the inner cutter, and the notch 1-1 on the outer cutter cuts the aluminum rod wire to obtain a billet; (2) Extruding the billet in the No. 1 die through a shaping punch to shape the billet; (3) The blank of the 2# die is squeezed by the positioning punch, the blank is further shaped, and the bottom chamfer of the blank is regularized for preforming; (4) The blank of the 3# die is squeezed by a stretching punch, the blank is stretched, a hole is opened at the large end of the blank, and a small hole is positioned; (5) The blank of the 4# die is squeezed by the shaping groove punch, and the bottom chamfer of the blank is secondary regularized; (6) Extruding the blank of die #5 through a shaping punch to evacuate the blank, including preforming the groove; (7) The blank of the 6# die is squeezed by a forming punch, and the burrs on the edges of the grooves are squeezed inside the die to remove the burrs, and the blank is perforated.

3. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The circular outer knife and the inner knife are installed on a movable cutting knife cylinder at the feed inlet of the multi-station intelligent cold heading machine.

4. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The blanks are sequentially placed into 1# to 6# molds through the clamps provided by the multi-station intelligent cold heading machine, and the 1# to 6# molds are molds that are disconnected from each other from top to bottom.

5. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The tool for punching the holes in the blank is installed inside the multi-station intelligent cold heading machine.

6. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The finishing process of the outer surface of the aluminum tube sleeve blank specifically includes: clamping and fixing the small hole end of the aluminum tube sleeve blank with the inner hole spring sleeve of the inner spindle of the cold heading machine, rough and fine turning the outer circle and end face of the large hole of the blank with an external cylindrical turning tool, chamfering one end of the large hole of the blank with an internal hole boring tool, moving it to the second spindle through the clamp of the cold heading machine, clamping and fixing the large hole end of the blank with the inner hole sleeve of the cold heading machine spindle, turning around and rough and fine turning the end face and outer circle of the small hole end of the blank, milling a pre-hole at the small hole end of the blank with an alloy milling cutter, and enlarging the small hole at the small hole end of the blank with an internal hole boring tool.

7. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: Cleaning the molded products specifically includes: using ultrasonic cleaning, controlling the pH of the cleaning solution between 8 and 9, cleaning for 10 minutes, and after the alkaline ultrasonic cleaning is completed, the aluminum tube sleeve is immersed in clean water to remove the alkaline water on the surface of the aluminum tube sleeve, and then blowing off the moisture on the surface of the aluminum tube sleeve, and finally placing it in a dryer for drying.

8. The method for processing an automobile air-conditioning aluminum tube sleeve according to claim 1, characterized in that: The model of the multi-station intelligent cold forging machine is 14B6S.

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