JPH0829388B2 - 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 an aluminum (including aluminum alloy) round bar material to produce a scroll material having a predetermined volume, and after hot pressing, sizing is performed by cold pressing. The present invention relates to a method for producing an aluminum scroll for an air conditioner by press working, except that the cutting work portion is left only in the length direction and the outer circumference flange portion.

[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.

[0004]

However, according to the above-mentioned cutting and polishing processes, it takes 10 to 25 to process one scroll in order to complete the process by taking 3 to 5 steps.
There is a problem that needs to be solved because it requires a minute and the processing man-hour is extremely large. The present invention has been made to solve the above problems, and by manufacturing the orbiting scroll and the fixed scroll by press working, it is possible to produce 10 to 20 pieces per minute, which is 50 to 100 times larger. It is an object of the present invention to provide a method for producing an aluminum scroll for an air conditioner, which can obtain a different processing speed.

[0005]

As a concrete means for solving the above problems, the present invention mainly uses a scroll material 1 having a predetermined volume by cutting an aluminum round bar as shown in FIG. By heating the scroll blank 1 to a heating temperature most suitable for hot pressing the scroll blank 1 onto the scroll blank 1, and pressing the heated scroll blank 1 with a punch 3. It has a scroll-shaped blade hole 10 and the blade hole 10
Has an inlet chamfered portion 15 and, following the inlet chamfered portion 15, a straight portion 16, a reverse taper portion 17 and a relief portion 18
By passing the scroll material 1 through the female die 2, the scroll material 1 has a scroll-shaped blade portion 9 on the front side of the cylindrical main body portion 13 and a mounting projection portion 11 on the back side, and is positioned and inserted on the outer periphery of the main body portion. Hot working a scroll material 1 having a shape having a plurality of flanges 5 having holes 8 formed therein,
The first step of pushing up the scroll material 1 from the female die 2 by the counter 4 and the positioning pins 7 standing at regular intervals based on the center in order to cold-size the scroll material 1 after the first step is finished. The positioning insertion hole 8 of the flange 5 is fitted and set on the female die 2 which is present, and the female die 2 has an ultra-high-precision finish and the shrinkage allowance due to the cooling of the scroll material 1 heated in the first step. In consideration of the molding allowance, a scroll-shaped blade hole portion 10 is produced, and the blade hole portion 10 has an inlet chamfered portion 15 and the inlet chamfered portion 15 is followed by a straight portion 16 and a reverse portion. A second process in which the female die 2 having the taper part 17 and the escape part 18 presses the scroll blank 1 after the first process with a punch 3 and pushes it up with a counter 4. The method of producing air conditioner for aluminum scroll and performing are provided.

[0006]

According to the method for producing an aluminum scroll for an air conditioner having the above-described structure, the scroll material 1 heated in the first step is pressed against the female die 2 by the punch 3 and pushed out from the female die 2 by the counter 4 to scroll hot. Material 1
The blade portion 9 of the inlet chamfered portion 15 in the blade hole portion 10,
Straight portion 16, reverse taper portion 17, and relief portion 18
Is processed into a scroll shape, and at the same time, a plurality of flanges 5 having a cylindrical outer peripheral cylindrical portion 13 and a positioning insertion hole 8 and a mounting projection 11 on the back side of the blade 9 are formed by press 1 stroke processing. Is processed. In the second step, the scroll material 1 is pressed and extruded while the positioning pin 7 of the female die 2 is inserted into the positioning insertion hole 8 of the scroll material 1 in the cold state, so that the scroll material 1 is processed during hot pressing. Since the scroll 1 shrinks when cooled, the shrinkage allowance is taken into account, and the inlet chamfered portion 15, the straight portion 16, the reverse taper portion 17 in the blade hole portion 10 of the female die 2 produced with the molding allowance taken into consideration.
By the relief portion 18, highly precise sizing process is performed by press 1-stroke process.

[0007]

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 mold, has a cylindrical main body recess 14 formed in the center thereof for processing 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 processed, and in the second step, the positioning insertion hole 8 is positioned 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. When the positioning pin 7 receives pressure from the upper portion during the sizing process, the female die 2
It is set to sink to the upper surface of.

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 advantage of this sizing process is that the scroll material 1 processed during hot pressing is
Since it shrinks when cooled, the shrinkage allowance is taken into account, and the sizing female die 2 with the blade hole portion 10 allowing for the forming allowance 2
To produce. This sizing process is almost the same mold as the hot pressing process of the first step, but it is necessary to remarkably improve the mold accuracy.

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 portion 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 hot press working of the scroll material 1, and hot presses. 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.

The counter 4 includes a hot press working method in which a normal pressure is applied upward by using a spring 20 as shown in FIG. 1 and a hot press working method in which the counter 4 is free without applying a normal pressure. . In the hot pressing method of applying the normal pressure, the blade portion 9 of the scroll material 1 is processed at the time of processing.
It is possible to prevent wrinkles from occurring at the bottom of the. In the hot press working method in which the blade is left free, some wrinkles occur at the bottom of the blade portion 9, but the life of the die can be extended. Further, when wrinkles are generated, it is possible to remove them 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. The counter 4 may or may not need the normal pressure body such as the spring 20 during the sizing process of the second process, but is selected depending on the material and size of the scroll material 1 as described above.

Next, the operation at the time of hot pressing, which is the first step of the method for producing an aluminum scroll for an air conditioner having the above-mentioned 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. At this time, the scroll material 1 is heated to a temperature of 400 to 450 degrees Celsius which is most suitable for hot press working of an aluminum material, so that a heating means such as an electric furnace is provided. Then, the female die 2 on which the counter 4 and the scroll material 1 are set is arranged at substantially the center of the press machine to be used. Next, the punch 3 is fitted from above the female die 2, and a pressure receiving surface (not shown) provided on the upper part of the punch 3 is pressed by a cylinder (not shown) of the press machine to perform hot press working of the scroll. Be seen. Scroll material 1 by the first step
As shown in FIGS. 2 and 3, the main body 13 has a blade portion 9 on the front side, a mounting protrusion 11 on the back side, and a positioning insertion hole 8 is provided around the main body portion 13. The flange 5 is processed at the same time.

The hot press working in the first step is performed by forming the blade portion 9 by one-stroke working of a press machine, the mounting convex portion 11 on the back side, and the positioning insertion hole 8 of the flange 5 provided 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-described structure, will be described. Since the aluminum scroll material 1 processed in the first step is hot-processed, a cooling period is provided until the aluminum scroll material 1 is cooled down to room temperature or a cooling device such as an air cooling fan is used. Then, the counter 4 for the second step
Set into the positioning pin 7 of the female die 2 for the second step in which the is inserted, the positioning insertion hole 8 of the scroll material 1 after cooling is set, and the mounting projection 11 of the scroll material 1 is fitted thereon. The punch 3 for the second step is set so as to be inserted. Next, it is pressurized by a cylinder (not shown) of the press machine, and sizing processing with higher accuracy than the first step is performed. In addition, the flange 5 is cut and the mounting projection 11
Cutting is used for processing.

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 dies 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. On the other hand, since the first step is hot forging and the second step is cold forging, it is necessary to pay attention to temperature control.

According to the above-mentioned embodiment, since the mold for the air-conditioning scroll can be incorporated in a general press device, no special device is required. Further, 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.

[0019]

The method for producing a scroll for an air conditioner according to the present invention has the above-described structure, and realizes high-precision scroll by realizing the manufacturing of the orbiting scroll and the fixed scroll by press working and by the positioning operation. Since it is possible to eliminate the need for cutting the scroll, it is possible to significantly reduce the processing time of the scroll, which has an excellent effect that it can be manufactured at low cost.

[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 front page (56) Reference JP-A-4-33738 (JP, A) JP-A-4-136491 (JP, A) JP-A-4-342887 (JP, A) JP-A-59-61542 (JP , A) JP-A-2-151341 (JP, A) JP-A-59-159241 (JP, A) JP-A-60-102244 (JP, A)

Claims (1)

[Claims] 1. An aluminum round bar material is cut to produce a scroll material having a predetermined volume, and the scroll material is heated to a heating temperature most suitable for hot pressing the scroll material to the scroll material. By pressing the scroll material after heating with a punch, the scroll-shaped blade hole portion has an inlet chamfered portion, and the inlet chamfered portion has a straight portion and a reverse taper. The scroll material has a scroll-shaped blade on the front side of the cylindrical main body and a mounting projection on the back side, and a positioning insertion hole is formed on the outer periphery of the main body by passing the scroll material through a female die having a release section and a relief section. A first step of hot working a scroll material having a shape having a plurality of flanges formed by punching, and pushing up the scroll material from a female die by a counter; In order to perform cold sizing of the scroll material after the first step, the positioning insertion holes of the flanges are fitted and set on the female die in which the positioning pins stand at a constant interval with the center as a reference, The female die has an ultra-high-precision finish, and has scroll-shaped blade holes that are manufactured in consideration of the shrinkage allowance due to the cooling of the scroll material heated in the first step and the forming allowance.
The scroll material, which has completed the first step, is pressed with a punch into a female die having an inlet chamfered portion in its blade hole portion and having a straight portion, a reverse taper portion and a relief portion following the inlet chamfered portion, and the counter is punched. A method of producing an aluminum scroll for an air conditioner, which comprises performing the second step of pushing up by