JPH0829389B2 - Production method of aluminum scroll for air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention cuts a round bar of aluminum (including aluminum alloy) to produce a scroll material of a predetermined volume, forms a scroll with high dimensional accuracy by cold pressing, and then cools it again. The present invention relates to a production method for producing an aluminum scroll for an air conditioner by press working except for performing ultra-high precision sizing work by inter-press working and leaving a cutting work part only in a longitudinal direction and a peripheral flange part.

[0002]

2. Description of the Related Art Conventionally, various types such as a reciprocating type, a rotary type, a screw type, and a scroll type have been used as a type of a compressor for a cooling device in an air conditioner for business use, a home air conditioner, an air conditioner for an automobile and the like. ing. Among them, the scroll type compressor has excellent characteristics that it consumes less power and has the lowest noise and vibration level because it has no valve. However, it still belongs to the minority group because it is the most difficult to process. When the production method by press processing provided here is performed, it is convinced that it will be cost-effective and will be adopted in large quantities. Further, it is said that the scroll-type compressor is most applicable to the use of a substitute gas instead of the CFC gas due to the total abolition of CFC gas in the future. In the scroll type compressor, the volume of the compression chamber formed by the combination of the orbiting scroll having the spiral vane portion which is the main component and the fixed scroll having the corresponding spiral vane portion corresponds to that of the orbiting scroll. By changing by turning, it sucks, compresses, and discharges the refrigerant continuously. Since there is no valve for sucking the refrigerant and it rotates smoothly, there is almost no vibration during operation and the operating noise is small. .

Since the spiral blades of the orbiting scroll and the fixed scroll slide against each other to perform a compression action, precise machining and finishing are required. As a method for processing the orbiting scroll and the fixed scroll, a molten metal forging method, a casting method, a high pressure die casting method, a cold forging method and the like are provided with an extra allowance, and then precise cutting and polishing are performed. The method of improving the accuracy by doing is taken. In the cutting and polishing, the scroll material molded by the above-described processing method is fixed, and ultra-precision cutting and polishing are performed by an end mill or a grindstone that is rotated at a high speed. However, according to the above cutting and polishing, it takes 10 to 25 to process one scroll in order to finish it by taking 3 to 5 steps.
However, there is a problem in that the number of machining steps is extremely large because of the required time.

Therefore, the present applicant gives a large work by hot press working at about 400 to 450 degrees Celsius, and thereafter produces a scroll by a method of finishing by cold press working at room temperature. Has been proposed (Patent application on May 20, 1993).

[0005]

However, a large amount of work is given by the hot press working, and thereafter,
According to the method of finishing by cold pressing at room temperature,
Since the dimensional accuracy of the hot press working is far inferior to that of the cold press working, sufficient dimensional accuracy may not be obtained even by the sizing work in the second step. In addition, a heating means such as an electric furnace for heating the scroll material to 400 to 450 degrees Celsius is required to accurately control the temperature. Then, the first step is hot pressing, and the second step is
Since the process is cold press working, the aluminum scroll material is hot worked when moving from the first process to the second process, so provide a cooling period until the temperature drops to around room temperature, or use an air cooling fan, etc. A cooling device is required. As a result, attention must be paid to the temperature control. Furthermore, aluminum is more susceptible to oxidation than other metals,
Due to its good thermal conductivity, large coefficient of thermal expansion, large specific heat and melting latent heat compared to melting point, it requires special skill and skill to calculate shrinkage allowance due to coldness, mold design, etc. There is a problem to be solved.

The present invention has been made to solve the above problems, and the orbiting scroll and the fixed scroll are largely processed by cold pressing at room temperature, and then cold pressing is performed again to finish. A method of producing aluminum scrolls for air conditioners that can obtain ultra-high dimensional accuracy, does not require auxiliary equipment such as heating means and cooling equipment, and does not require cooling period, temperature control, or special skill or skill. The purpose is to provide.

[0007]

As a concrete means for solving the above problems, the present invention mainly uses an aluminum round bar for cold pressing a scroll with high dimensional accuracy as shown in FIG. The material is cut to produce a scroll material 1 having a predetermined volume, and the scroll material 1 after cutting is pressed by a punch 3 to have a scroll-shaped blade hole portion 10 and an inlet to the blade hole portion 10. The scroll blank 1 is passed through a female die 2 having a chamfered portion 15 and a straight portion 16, a reverse taper portion 17 and a relief portion 18 following the inlet chamfered portion 15 so that the scroll material 1 can be inserted into a cylindrical main body portion 13. High dimensional accuracy of a shape having a scroll-shaped blade portion 9 on the front side, a mounting convex portion 11 on the back side, and a plurality of flanges 5 having positioning insertion holes 8 on the outer periphery of the main body portion. The scroll material 1 is cold-pressed, and the counter material 4 is used to push the scroll material 1 out of the female die 2, and the scroll material 1 after the first step is subjected to cold ultra-high-precision sizing processing. Therefore, the positioning insertion holes 8 of the flange 5 are fitted and set on the female die 2 in which the positioning pins 7 stand at regular intervals with the center as a reference, and the female die 2 has an extremely high-precision finish. In addition, there is a scroll-shaped blade hole portion 10 produced in consideration of the molding allowance, an inlet chamfer portion 15 is provided in the blade hole portion 10, and a straight portion 16 and a reverse taper portion 17 are provided following the inlet chamfer portion 15. And the female die 2 having the escape portion 18 is subjected to a second step in which the scroll material 1 having undergone the first step is pressed by the punch 3 and pushed up by the counter 4. Process for the production of air-conditioning aluminum scroll that is provided.

[0008]

According to the method for producing an aluminum scroll for an air conditioner having the above-described structure, the scroll material 1 is cold pressed by pressing the scroll material 1 against the female die 2 with the punch 3 and pushing it out from the female die 2 with the counter 4 in the first step. The blade portion 9 is processed into a scroll shape with high dimensional accuracy by the action of the inlet chamfered portion 15, the straight portion 16, the reverse taper portion 17, and the relief portion 18 in the blade hole portion 10, and at the same time, has a cylindrical outer peripheral shape. The main body 13 and the plurality of flanges 5 provided with the positioning insertion holes 8 and the mounting projections 11 on the back side of the blades 9 are processed by press 1-stroke processing. And the scroll material 1 is cold by the second step.
The scroll material 1 is pressed and pushed out while the positioning pin 7 of the female die 2 is inserted into the positioning insertion hole 8 of the female die 2, and the inlet of the female die 2 in the blade hole portion 10 produced in consideration of the molding allowance. The chamfered portion 15, the straight portion 16, the reverse taper portion 17, and the relief portion 18 perform ultra-high-precision sizing processing by press one-stroke processing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for producing an aluminum scroll for an air conditioner according to the present invention will be described with reference to the accompanying drawings. As the scroll material 1, an aluminum round bar material having high wear resistance is used, and the scroll material 1 is cut by any method into a length close to the volume after processing (determined by trial production). Also, if necessary, annealing, bonding, etc. are applied to make the material uniform and enhance the corrosion resistance. FIG. 1 is a sectional view showing a mold used in a method for producing an aluminum scroll for an air conditioner. The mold is provided for the first step and the second step,
The appearance is similar, and the dimensions of details are different as described later. The orbiting scroll and the fixed scroll have different shapes so that the vane portions 9 act as a compressor with each other, and depending on how they are attached to the main body side, the mounting projection 1
Since the shape of No. 1 is different, the orbiting scroll mold and the fixed scroll mold are required separately. 1 to 3 show an orbiting scroll, and in FIG. 5, 1a indicates an orbiting scroll and 1b indicates a fixed scroll. Figure 6
Shows the mounting projection 11b of the fixed scroll.

The female die 2, which is the lower die, has a cylindrical main body recess 14 formed in the center thereof so as to machine the main body 13 of the scroll. Then, the scroll-shaped blade hole portion 1 is formed below the scroll-shaped blade portion 9 so as to be processed.
0 is provided. As shown in FIG. 4, the cross-sectional shape of the vane hole portion 10 is provided with an inlet chamfered portion 15, a straight portion 16, an inverse tapered portion 17, and a relief portion 18. The inlet chamfered portion 15 is provided to smooth the flow of the meat of the scroll material 1 at the time of forming, and is rounded or C-chamfered to about 0.2 to 2 mm. The straight portion 16 is provided close to the required size, the reverse taper portion 17 is provided for taking a draft taper by the inlet chamfered portion 15, and the relief portion 18 is provided for preventing the scroll material 1 from hardening, and is also taken out. Scroll material 1 that sometimes occurs
It is provided in order to minimize the flash.

Further, in order to machine a plurality of flanges 5 (about 2 to 6 depending on the size of the scroll) and positioning insertion holes 8, a plurality of flange recesses 6 and positioning pins 7 (first In the first step, the positioning insertion hole 8 is machined, and in the second step, the positioning insertion hole 8 is provided for positioning and is vertically movable by a spring). In the central portion of the female die 2 used for the sizing process in the second step, a blade hole portion 10 having an ultra-high precision finish and a plurality of positioning pins 7 are set up at regular intervals with reference to the center. The scroll material 1 can be set on the positioning pins 7 and the positioning when performing the sizing process in the second step can be accurately set. The positioning pin 7 is set so as to sink to the upper surface of the female die 2 when pressure is applied from above during sizing.

Two types of female dies 2 are prepared, one for the scroll forming in the first step and one for the sizing processing in the second step. For scroll forming which is the first step, it does not require so much accuracy, but the scroll material 1 should not be hardened in order to prevent cracking and chipping of the female die 2 during the second step to improve mold holding. Focusing on the inlet chamfered portion 15, straight portion 16, reverse taper portion 17,
And the size of the escape portion 18 is set. For the sizing process, which is the second step, since some amount of hardening of the scroll material 1 is not a problem because it is the final process, the accuracy after the sizing process is emphasized, and it is necessary to provide it close to the required dimension. is there. The feature of this sizing process is to manufacture the female die 2 for sizing having the blade hole portion 10 in consideration of the molding allowance. This sizing process is almost the same as that of the cold pressing process of the first step, but it is necessary to remarkably improve the mold precision.

The upper die punch 3 is provided with a mounting recess 12 for processing the mounting projection 11. The mounting projection 11 is used when the orbiting scroll is mounted on the air conditioner body side. Therefore, the air conditioner is provided so as to have a shape and size corresponding to the mounting method on the main body side.
The mounting projection 11b for mounting the fixed scroll on the air conditioner body side is annular as shown in FIG. Therefore, the punch 3, which is the upper die, is provided with the mounting concave portion 12 in an annular shape in order to process the mounting convex portion 11b.

The counter 4 is turned upward and the counter blade 19
Is provided. The counter blade portion 19 is provided in a scroll shape that fits into the blade hole portion 10 of the female die 2, absorbs the thrust force of the female die 2 during cold press working of the scroll material 1, and also performs cold pressing. In order to make it easier to remove the scroll blank 1 from the female die 2 after processing, the scroll width of the blade 9 is 0.02 to 0.2.
Set it smaller by about a millimeter.

A cold press working method of the first step in which a normal pressure is applied upward to the counter 4 by using a spring 20 as shown in FIG. 1 and a first step in which the counter 4 is freed without applying the normal pressure. There is a cold press working method. In the cold pressing method of the first step in which the normal pressure is applied, it is possible to prevent wrinkles from being generated on the bottom of the blade portion 9 of the scroll material 1 during processing. In the cold pressing method of the first step which is left free, some wrinkles are generated on the bottom of the blade portion 9, but the life of the mold can be extended. Also,
If wrinkles occur, they can be removed in the sizing process in the second step. Therefore, either processing method is selected and used depending on the size and material of the scroll material 1. Counter 4 during sizing in the second process
May or may not require a normal pressure body such as the spring 20, but similar to the above, the scroll material 1
Select according to the material and size.

Next, the operation during cold pressing, which is the first step of the method for producing an aluminum scroll for an air conditioner having the above-described structure, will be described. First, the counter blade portion 1 of the counter 4 is inserted into the blade hole portion 10 of the lower female die 2.
9 is fitted and set, and the main body recess 14 at the top is set.
Set scroll material 1 to. And counter 4
And the female die 2 on which the scroll material 1 is set
Is located approximately in the center of the press used. Next, the punch 3 is fitted from above the female die 2, and a pressure receiving surface (not shown) provided on the upper portion of the punch 3 is pressed by a cylinder (not shown) of the press machine to perform cold press working of the scroll. Be seen. As shown in FIG. 2 and FIG. 3, the scroll material 1 by the first step has the blade portion 9 with high dimensional accuracy on the front side of the cylindrical main body portion 13 and the mounting convex portion 11 on the back side. The flange 5 having the positioning insertion hole 8 around the portion 13 is cold-pressed at the same time.

The cold press working of the first step is one-stroke working of a pressing machine for molding the blade portion 9, the mounting convex portion 11 on the back side, and the positioning insertion hole 8 of the flange 5 prepared on the outer periphery. This is a processing method in which three types of molding are performed simultaneously. Positioning pins 7 are provided on the female die 2 in alignment with the positioning insertion holes 8 provided on the outer circumference of the scroll material 1 after the first step. The scroll material 1 can be set on the positioning pins 7 and the positioning when performing the sizing process in the second step can be accurately set.

Next, the sizing process which is the second step of the method for producing an aluminum scroll for an air conditioner having the above-mentioned structure will be described. The aluminum scroll material 1 processed in the first step is placed on the positioning pin 7 of the female die 2 for the second step in which the counter 4 for the second step is incorporated,
The positioning insertion hole 8 is fitted and set, and the mounting projection 11 of the scroll material 1 is fitted on the positioning insertion hole 8.
Set the punch 3 for the process. Next, it is pressurized by a cylinder (not shown) of the press machine, and an ultra-high-precision sizing process that is more accurate than the first step is performed. Further, cutting is used for cutting the flange 5 and working the mounting projection 11.

In the coupling of the first step and the second step, two general-purpose presses placed at positions having a predetermined interval are used to attach two kinds of molds for the first step and the second step, respectively. After being set, the scroll material 1 is continuously conveyed between the two press machines by attaching an automatic feeder by various feeders or manually feeding by a worker. Further, it is also possible to incorporate the metal molds for the first step and the second step into a single transfer press device in which a feeding device is incorporated to provide an automatic press.

According to the above-mentioned embodiment, the vane portion 9 of the scroll for an air conditioner is manufactured by cold forging to increase the material yield, which is also advantageous in saving resources and energy. Further, since the cold working is performed, it is expected that the material quality is improved (the crystal grains are made finer) by the forging effect obtained as a secondary effect. Further, unlike the hot working, the scale is often generated, which does not cause severe rough skin. Further, since the die for the air conditioner scroll can be incorporated into a general press device, no special device is required. Then, the size of the manufactured air-conditioner scroll can be easily changed by replacing the female die 2, the punch 3, and the counter 4.
It is also possible to incorporate it into the press device and integrate it into a dedicated processing device for scrolls for air conditioners.

[0021]

The method for producing a scroll for an air conditioner according to the present invention has the above-mentioned structure, and the orbiting scroll and the fixed scroll are largely processed by cold pressing at room temperature,
By performing cold pressing again to finish, ultra-high precision dimensional accuracy is obtained, auxiliary equipment such as heating means and cooling equipment are not required, and cooling period and temperature management are also unnecessary. It has the excellent effect that no special skill or skill is required.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mold configuration for carrying out a method for producing a scroll for an air conditioner of the present invention.

FIG. 2 is a side view showing the scroll material after processing.

FIG. 3 is a front view showing the scroll material after processing.

FIG. 4 is a sectional view showing a sectional shape of a blade hole portion of a female die.

FIG. 5 is a perspective view showing a state in which an orbiting scroll and a fixed scroll are in mesh with each other.

FIG. 6 is a perspective view showing a mounting portion of a fixed scroll.

[Explanation of symbols]

1 ... scroll material, 2 ... female die, 3 ... punch, 4 ... Counter, 5 ... Flange, 6 ... Flange recess, 7 ... Positioning pin, 8 ... Positioning insertion hole, 9 ... Blade, 10 ... Blade hole, 11 ... Mounting Convex part, 12 ... mounting concave part, 13 ... body part,
14 ... Body concave part, 15 ... Inlet chamfered part, 16 ... Straight part, 17 ... Reverse taper part, 18 ... Relief part,
19 ... Counter blade

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-33738 (JP, A) JP-A-4-136491 (JP, A) JP-A-4-342887 (JP, A) JP-A-5- 337586 (JP, A) JP 59-61542 (JP, A) JP 2-151341 (JP, A) JP 6-328183 (JP, A)

Claims (1)

[Claims] 1. A scroll material having a predetermined volume is manufactured by cutting an aluminum round bar material to press a scroll with high dimensional accuracy in a cold state, and the scroll material after the cutting is pressed by a punch. , The scroll having a scroll-shaped blade hole portion, having an inlet chamfered portion in the blade hole portion, and passing through the inlet chamfered portion through a female die having a straight portion, a reverse taper portion, and a relief portion, The material has a cylindrical body with scroll-shaped blades on the front side, a mounting protrusion on the back side, and a plurality of flanges with positioning insertion holes on the outer periphery of the body. The first step of pressing the scroll material from the female die with a counter by cold pressing the scroll material, and the scroll material after the first step is finished. In order to perform ultra-high-precision sizing processing, the positioning insertion holes of the flange are set on the female die with positioning pins standing at regular intervals based on the center, and the female die has an extremely high height. It has a precise finish and a scroll-shaped blade hole that is made in consideration of the molding allowance of the scroll material, and has an inlet chamfer in the blade hole and a straight portion, reverse A method for producing an aluminum scroll for an air conditioner, comprising: a female die having a taper portion and a relief portion; and a second step of pressing the scroll material after the first step with a punch and pushing it up with a counter.