CN1759977A - Method for producing rocking-turn disk of motorcar air conditioner through technique of liquid forging - Google Patents

Abstract

The invention discloses a method for producing a wobble plate of an automobile air conditioner by adopting a liquid die forging process, and relates to a processing method of the wobble plate of an automobile air conditioner. The invention solves the problems of poor mechanical properties of the existing car air conditioner rocking plate, failure to meet the requirements of the working environment, complex processing procedures, complex mold structure, and long production cycle of products. The method of the invention adopts the following steps: 1. Design and forming of the mould; 2. Aluminum alloy melting; 3. Liquid die forging process; 4. Solid solution aging treatment. The method of the present invention adopts the liquid die forging process to produce the shaking plate of the automobile air conditioner, which can realize no-cutting processing, simplify the mold structure, shorten the production cycle, and reduce or eliminate defects such as shrinkage cavities, shrinkage porosity, cold shut, air holes and cracks, etc. Reduce segregation, refine and improve the structure and mechanical properties and other advantages.

Description

Method for Producing Automobile Air Conditioner Swing Plate Using Liquid Die Forging Technology

technical field

The invention relates to a processing method for a swing plate of an automobile air conditioner.

Background technique

At present, the production of the car air conditioner rocking plate is made by metal mold gravity casting or metal pressure casting, which leads to poor mechanical properties of the car air conditioner rocking plate and cannot meet the requirements of the working environment; The rocking plate of the device has a complicated cutting process, the mold structure cannot be simplified, and the production cycle of the product is long.

Contents of the invention

In order to solve the problems of poor mechanical properties of the existing automobile air conditioner rocking plate, unable to meet the requirements of the working environment, complex processing procedures, complex mold structure, and long production cycle of the product, the present invention proposes a method for producing automobile air conditioners using a liquid die forging process. The method for device shaking plate, the concrete technical scheme that solves this problem is as follows:

The present invention adopts liquid die forging process to produce the method steps of automobile air conditioner shaking plate as follows:

Step 1. Mold design:

According to the structure, shape, size and performance requirements of the car air conditioner rocker plate, the punch 3, the die 6, the punch set plate 2, the die set plate 5, the upper die plate 1 and the lower die plate 8 are composed The design of the liquid forging die;

Step two, aluminum alloy smelting:

(1) Before the crucible is used, it must be treated and then coated with paint;

(2) Clean the surface of the aluminum alloy and heat it in a crucible; when the crucible is heated to 500-800°C, add an aluminum alloy blank to melt;

(3) After the aluminum alloy is melted, remove the scum on the liquid surface;

Step 3, liquid die forging process:

(1) Install the air conditioner rocking plate mold on the hydraulic press, and debug the mold;

(2) When the mold is heated to 100-150°C, spray lubricant into the mold cavity;

(3) When the mold is heated to 220-280°C, the aluminum alloy liquid melted in step 2 is poured into the mold cavity according to the volume of the mold cavity; the temperature when pouring the aluminum alloy liquid is 740-790°C;

(4) After the aluminum alloy liquid is poured into the mold, the punch is pressurized at a speed of 18-20mm/s for 2-7s. When the pressure reaches 120-160MPa, the pressure maintenance time is 30-80s;

(5) Take out the shaker plate of the automobile air conditioner that has been liquid-forged, and quickly put the die forging into the sand pile to cool down;

Step four, solution aging treatment:

Quenching and tempering the liquid die-forged cradle plate of the automobile air conditioner in step 3, to obtain an aluminum alloy cradle plate of the automobile air conditioner.

The method of the present invention adopts the liquid die forging process to produce the shaking plate of the automobile air conditioner, which can realize no-cutting processing, simplify the mold structure, shorten the production cycle, and reduce or eliminate defects such as shrinkage cavities, shrinkage porosity, cold shut, air holes and cracks, etc. Reduce segregation, refine and improve the structure and mechanical properties and other advantages.

Description of drawings

Fig. 1 is a schematic sectional view of the overall structure of a forming device for producing an automotive air conditioner by a liquid die forging process, and Fig. 2 is a schematic structural view of a resistance wire heater 15.

In the figure, 1 is the upper formwork, 2 is the punch plate, 3 is the punch, 4 is the insulation board, 5 is the die set, 6 is the die, 7 is the ejector pin, 8 is the lower formwork, 9 is the bolt, 10 is a positioning pin, 11 is a car air conditioner shaking plate, 12 is a resistance wire, 13 is an inner high-frequency porcelain tube, 14 is an outer high-frequency porcelain tube, and 15 is a resistance wire heater.

Detailed ways

Specific embodiment one: the present embodiment adopts liquid die forging to produce the technological method step of automobile air conditioner rocking plate as follows:

Step 1. Mold design and molding:

According to the structure, shape, size and performance requirements of the car air conditioner rocker plate, the punch and die liquid forging dies for the car air conditioner rocker plate are designed. The design of the punch 3 and die 6 of the swinging plate of the automobile air conditioner should fully consider the influence of the mold material, clearance, demoulding slope, and exhaust. The five concave holes of the swinging plate of the automobile air conditioner are the transmission power surface , the machining allowance is enlarged by 1.0mm, and the demoulding slope is enlarged by 3°; the center hole is enlarged by 1.0mm due to the need of assembly and fixation, and the rocking plate is designed according to the heat shrinkage of aluminum alloy by 1.5%; the punch 3 and the die 6 Select 3Cr2W8V, after oil quenching at 1130-1150°C, and then temper at 550-600°C for 1-2 hours; punch set plate 2, die set plate 5, upper template 1 and lower template 8 use No. 45 steel, After oil quenching at 820-840°C, temper at 500-540°C for 1-2 hours;

Step two, aluminum alloy smelting:

(1) Before using the crucible, remove the rust, oxidized slag, old paint layer and other dirt adhering to the surface, and then apply new paint;

(2) Clean the surface of the aluminum alloy model 4A11 (LD11), put it into a crucible and heat it; put the crucible in a resistance furnace and heat it to 500-800°C, add aluminum alloy blanks for melting;

(3) After the aluminum alloy is melted, sprinkle No. 2 refining flux evenly on the surface of the aluminum alloy liquid, stir evenly to dissolve the refining flux into the aluminum alloy liquid, let it stand for 5 to 15 minutes, and remove the liquid surface scum of

Step 3, liquid die forging process:

(1) Install the swing plate mold of the automobile air conditioner on the hydraulic press or the modified die-casting machine; as the temperature of the mold rises, the bolt 9 may become loose, which will cause the position of the mold to shift and easily damage the mold cavity. The mold is debugged;

(2) The heating of the mold adopts the resistance wire heater 15, considering the insulation between the resistance wire 12 and the mould, adopting 4 outer layer high-frequency porcelain tubes 14 of Φ40mm and 4 inner layer high-frequency porcelain tubes 13 of Φ32mm every two The roots form a pair (see Figure 2), and the resistance wire 12 is spirally wound on the inner high-frequency porcelain tube 13 of Φ32mm, and the inner high-frequency porcelain tube 13 of Φ32mm is fixed in the middle of the outer high-frequency porcelain tube 14 of Φ40mm The resistance wire 12 is made of Cr20Ni80 material, with a diameter of 1.5mm, a helical pitch of 4mm, and a pitch diameter of 36mm to form a resistance wire heater 15. Each pair is connected in series at a voltage of 220V, and the power is controlled at 3-4kW. The preheating speed of the heater is fast and easy to control; when the mold is preheated to 100-150°C, spray the mold cavity with lubricant (lubricant consists of 5% graphite powder of 200-300 mesh, add 95% of machine oil, stir evenly, Make engine oil graphite lubricant), keep spraying evenly when spraying paint;

(3) When the mold is sprayed and heated to 220-280°C, pour the aluminum alloy liquid melted in step 2 into the mold cavity according to the volume of the mold cavity; when pouring, it should be as close to the mold mouth as possible to reduce the fluid height of the aluminum alloy liquid, To avoid aluminum alloy liquid splashing, the temperature of the aluminum alloy liquid container should be similar to that of the aluminum alloy liquid, and the temperature of the aluminum alloy liquid when pouring is 740-790°C;

(4) After the aluminum alloy liquid is poured into the mold, the punch 3 is pressurized at a speed of 18-20mm/s for 2-7s. When the pressure reaches 120-160MPa, the pressure maintenance time is 30-80s;

(5) Take out the automobile air conditioner shaking plate 11 through liquid die forging and put it into the sand pile rapidly to cool down;

Step four, solution aging treatment:

The liquid die forging automobile air conditioner rocking plate 11 obtained in step 3 is quenched by holding at 535±5°C for 2.5 to 3.5 hours, and tempering at 175±5°C for 5 to 7 hours to obtain an aluminum alloy automobile air conditioner Shaker11.

The mechanical performance index of the automobile air conditioner shake plate produced by this embodiment reaches: σ _b ≥ 280Mpa; δ ≥ 10%; HV _0.1 is 100-120. The rocking plate has undergone a bench test at 100°C for 1500 hours without any change in shape and size, and the surface and interior of the rocking plate have no defects such as cold barriers, pores, shrinkage cavities, and cracks.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 3, the pouring temperature of the aluminum alloy liquid is 740°C, the mold heating temperature is 280°C, the applied pressure is 120Mpa, and the pressure maintenance time is 80s. Other steps are the same as in the first embodiment.

Embodiment 3: The difference between this embodiment and Embodiment 1 and Embodiment 2 is that in Step 3, the pouring temperature of the aluminum alloy liquid is 760°C, the mold heating temperature is 250°C, and the applied pressure is 140MPa. The pressure hold time is 60s. Other steps are the same as in the first embodiment.

Embodiment 4: The difference between this embodiment and Embodiments 1, 2, and 3 is that the pouring temperature of the aluminum alloy liquid in step 3 is 790°C, the temperature of the mold heating is 220°C, and the applied pressure is 160Mpa, and the pressure is maintained The time is 30s. Other steps are the same as in the first embodiment.

Claims (8)

1, adopt liquid forging process to produce the method for motorcar air conditioner shaking tray, it is characterized in that the step of this method is as follows:

Step 1, Mould design:

According to motorcar air conditioner shaking tray structure, shape, size and performance requirement, carry out the design of punch (3), die (6), punch cage plate (2), die cage plate (5), cope match-plate pattern (1) and the liquid-state forging die that lower bolster (8) is formed of motorcar air conditioner shaking tray;

Step 2, aluminium alloy smelting:

(1) before crucible uses, handle, be coated with then and coat it;

(2) aluminum alloy surface is cleaned out, put in the crucible and heat; Adding aluminum alloy blank when crucible is heated to 500～800 ℃ melts;

(3) behind the aluminum alloy melting, remove the scum silica frost on the liquid level;

Step 3, liquid forging process:

(1) the air-conditioner swaying tray mould is installed on the hydraulic press, mould is debugged;

(2) during mold heated to 100～150 ℃, in mold cavity, spray lubricant;

(3) during mold heated to 220～280 ℃, will pour in the die cavity through the aluminium alloy liquid of step 2 fusing by the volume of die cavity; Temperature during the aluminum alloy melt cast is 740～790 ℃;

(4) after aluminium alloy liquid poured into mould, punch was with the speed of 18～20mm/s pressurization, 2～7s, and when pressure reaches 120～160MPa, it is 30～80s that pressure is held time;

(5) cooling in the sand heap is put in taking-up rapidly through the motorcar air conditioner shaking tray of liquid forging and forging part;

Step 4, solid solution aging are handled:

To quench and tempering through the motorcar air conditioner shaking tray of the liquid forging of step 3, promptly make the aluminium alloy automobile air-conditioner swaying tray.

2, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, allowance amplifies 1.0mm when it is characterized in that the design of the punch (3) of motorcar air conditioner shaking tray and die (6) liquid-state forging die, and draw taper is amplified 3 °; Centre bore amplifies allowance 1.0mm, and shaking tray designs by 1.5% of aluminum alloy heat amount of contraction.

3, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, it is characterized in that punch (3) and die (6) behind 1130～1150 ℃ of oil quenchings, again through 550～600 ℃ of tempering 1～2 hour; Punch cage plate (2), die cage plate (5), cope match-plate pattern (1) and lower bolster (8) are behind 820～840 ℃ of oil quenchings, again through 500～540 ℃ of tempering 1～2 hour.

4, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, it is characterized in that the crucible in the step 2 adds the heating of thermal recovery resistance furnace.

5, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, it is characterized in that the mold heated in the step 3 adopts resistance heater (15), resistance heater (15) is made up of internal layer high frequency porcelain tube (13), outer high frequency porcelain tube (14), resistance wire (12), resistance wire (12) curl is wrapped on the outer round surface of internal layer high frequency porcelain tube (13), and internal layer high frequency porcelain tube (13) is fixed on the centre of outer high frequency porcelain tube (14).

6, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, the pouring temperature that it is characterized in that aluminium alloy liquid in the step 3 is 740 ℃, the temperature of mold heated is 280 ℃, and applied pressure is 120Mpa, and pressure is held time and is 80s.

7, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, the pouring temperature that it is characterized in that aluminium alloy liquid in the step 3 is 760 ℃, the temperature of mold heated is 250 ℃, and applied pressure is 140MPa, and pressurization is held time and is 60s.

8, employing liquid forging process according to claim 1 is produced the method for motorcar air conditioner shaking tray, the pouring temperature that it is characterized in that aluminium alloy liquid in the step 3 is 790 ℃, the temperature of mold heated is 220 ℃, and applied pressure is 160Mpa, and pressure is held time and is 30s.

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