JPS63144850A - Die casting device and die casting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to automatic die casting equipment, and in particular to horizontal rotary die casting equipment used for casting electric motor rotors or the like. Regarding.

More particularly, the present invention relates to improvements in die casting equipment for automatically casting rotors in a minimum amount of time. This die casting equipment has three stations capable of performing multiple tasks or functions simultaneously.

The functions or tasks performed at each station are such that the operating speed of the equipment can be optimized.

<Prior Art> A conventional die casting apparatus is equipped with -ffi, front and rear fixed plates, and a movable plate or a movable plate attached so as to be able to reciprocate between both the fixed plates. The relative positions of the fixed plates are maintained by a plurality of tie bars extending between the fixed plates. The die halves are each fixed to a front fixed plate and a movable plate, and the die is opened and closed by extending or pulling on the movable plates. After the die is closed, molten metal is injected into the die to form the die cast part.

After forming the die-cast part in this way, the die is opened by pulling the movable die apart, and after the movable plate is moved a predetermined distance, it can be slid into each opening provided in both the die and the movable plate. The disposed bumper pin is engaged with a bumper plate disposed on the rear side of the moving plate.

These bumper pins engage the die cast part and remove it from the die halves that are not seated in the transfer plate.

After the die-cast part is removed from the die-casting equipment, excess metal, commonly referred to as sprue or runners, is removed in a separate press equipment, referred to as a trim press.

Another conventional die casting apparatus has a trimming mechanism incorporated therein. In this type of machine, an indexing device rotates the die cast part between a casting station and a trimming station within the machine. Additionally, in conventional die casting sections, the die cast part is attached to the indexing mechanism by a sprue that is typically formed when the part is cast. The die cast part is then rotated to a trimming station where the sprue is removed.

Die casting equipment is used to cast rotors for electric motors. When used for such applications, the main body of the motor is made of a stack of discs, and is fixed integrally by inserting a temporary skew pin into a hole penetrating the center of the disc. Die casting equipment is used to cast the rotor connector bars and end rings.

First, an indexer picks up the rotor body at a mounting station and transports it to a casting station where connector bars and end rings are formed. The rotor is then transported through a cooling station and the skew pins are ejected from the cast rotor. Finally, remove the rotor from the device. At certain stages, the sprue or runners are removed from the finished rotor and returned to the waste container for reuse.

-ffi In conventional die casting equipment, there are typically two methods of injecting molten material, such as zinc, aluminum, magnesium, etc., into the die. In the first method, molten material is conveyed around the mold part and injected into the side of the cavity. For this reason, runners remain on the sides of the cast part. This method is best suited for side gate casting (
side 9atecasting).

In the second method, molten metal is injected into the end of the cavity through an inwardly tapered conical opening in the die plate. Such openings have a smaller diameter on the side of the die plate closer to the interior of the cavity.

This method uses pinpoint gating (p
This is called in-point gating.

In another prior art die casting machine, a six-stage indexing mechanism is mounted between two stationary plates for rotating parts between a plurality of isolated stations. There is. Each station performs one operation. A toggle linkage moves the translation plate toward or away from the indexing mechanism.

A disadvantage of this conventional self-indexing multi-station die casting apparatus is that the rotor casting time is longer than necessary. This device has six stations, so that the factor that limits its speed is the longest time for completing each of the six tasks. Therefore, in such a configuration, the indexing speed of the device is limited to the longest task completion time. Additionally, a separate ejection mechanism is provided in this prior art device, which adds to the time required to cast and eject the rotor and adds to the complexity of the overall device.

Furthermore, in conventional die casting equipment, relatively heavy workpieces such as the moving plate have long strokes because they travel relatively long distances to close the die before casting the part. by one of the devices
Additional time is added to the working time of the cycle, negatively impacting the productivity of the equipment.

Additionally, conventional die casting equipment does not provide sufficient compensation for varying rotor stack heights. For this reason, such conventional die casting equipment is limited to a certain minimum stacking height of SJJ-capable rotors, or manually inserting spacer plates to cast rotors of various stacking heights. This is undesirable because it wastes time and requires removal.

<Problems to be Solved by the Invention> The object of the present invention is therefore to provide an improved method particularly suitable for casting rotors of electric motors and capable of minimizing the time required for one cycle of the entire process. The purpose of the present invention is to provide an automatic die casting device. A second object of the present invention is to provide a die casting apparatus having a sufficient correction range. A third object of the present invention is to provide a die casting apparatus in which a movable die casting part is fixed to a small movable platen with a short travel distance and is clamped by a hydraulic clamping cylinder.

According to the present invention, the above-mentioned drawbacks of conventional die casting machines can be overcome by providing an improved automatic die casting machine.

Means and operation for solving the above problems> According to the present invention, by using an indexing turntable and other working means, a fully automated production system capable of performing multiple operations at the same time as will be described later is realized. A rotor die casting device with high performance is provided. The operations required to die cast the rotor are performed at three stations such that all operations at each station are completed in equal amounts of time. Therefore, there is no wasted time at any station, and the cycle time of the entire process is set optimally.

Furthermore, the die casting apparatus according to the invention is such that certain work elements are fixed opposite to movable elements, and this configuration provides maximum efficiency. Furthermore, the die casting device according to the invention is able to completely compensate for different stacking heights of the rotors, the injection of the molten shot material takes place via a movable clamping member, and the injection unit 1 ~ and the clamping The optimum efficiency can be obtained by configuring the unit.

The die casting device according to the invention comprises a rotating turret with three stations. The first station has casting and correction functions, the second station performs pin extrusion and trimming processes, and the third station performs attachment and removal operations.

Furthermore, the die-casting device according to the invention comprises a compensating part with one or more double-acting compensating hydraulic cylinders capable of compensating over the entire range.

This correction part is fixed and relatively small in size. A movable die holding block or moving plate operating with short strokes is provided to close the die cavity. Injection takes place from the end of the device, where the clamping cylinder is located, through the movable clamping plate.

A first advantage of the present invention is that cycle times for die casting parts can be reduced over conventional equipment. The only factors that determine cycle time are the weight of the shot and the solidification time of the metal. All other factors act simultaneously and are included within this time frame.

A second advantage of the invention is its relatively simple construction.

A third advantage of the present invention is that the range that can be corrected is sufficiently wide.

A fourth advantage of the present invention is that a relatively lightweight movable workpiece or movable platen can move a relatively short distance to form the cavity, thereby improving the overall cycle time of the device.

A fifth advantage of the present invention is that the small movable platen is operated by a hydraulic clamping cylinder that is easily adjustable over a wide pressure range and provides smooth, shock-free operation.

A sixth advantage of the present invention is that all die-cast parts within a selected size group can be cast at a uniform chamber pressure.

A seventh advantage of the invention is that the correction and injection operations are performed very simply and efficiently.

An eighth advantage of the present invention is that it can be used in either complete sight gating or pinpoint gating devices.

According to the present invention, a die casting apparatus is provided that performs a complete die casting operation including multiple operations. The die casting apparatus includes a frame having at least two fixed opposing pressure plates and a rotating turret member disposed between the refixed plates. The rotating turret member has a plurality of stations in the vicinity of which is located equipment or means for simultaneously performing at least one function of the die casting cycle at each station. The tasks performed at each station are determined so that the time required to complete the tasks is approximately equal.

Further, according to the present invention, a method and a die-casting apparatus for die-casting a rotor of an electric motor are provided. The die casting apparatus includes a rotating turret having first, second and third stations and a plurality of devices operating in conjunction therewith. The die casting method consists of compensating for different thicknesses of the stack of rotors and casting at least one rotor within a predetermined time in a first station. Simultaneously with the correction and casting operations at the first station, at least one alignment pin is pushed out of the rotor at the second station, and the rotor is trimmed to remove the runners within approximately the predetermined time period described above. Simultaneously with the correction and casting operation at the first station, at least one rotor is removed from the pallet at the third station within the predetermined time period mentioned above, and the stack is then installed on the turret.

The above-mentioned objects and other features of the present invention, as well as means for achieving them, will be described in detail below using embodiments with reference to the accompanying drawings.

<Example> Corresponding parts in each figure are indicated with the same reference numerals.

The embodiments disclosed below are preferred embodiments of the present invention, and the technical scope of the present invention is not limited to these embodiments.

FIG. 1 schematically shows a die casting apparatus 10 according to the invention. Although this embodiment is a side gate type device, it goes without saying that it can also be applied to a pin gate type device.

The die casting apparatus 10 has fixed plates 14.16.
18.20 is attached to the frame 12. A rotating turret 22 is mounted between the fixed plates 16,18, as will be explained in more detail below. Fixed plate 14.
16 are integrally fixed by two tie rods 24, and the fixing plate 16.18 is fixed by two tie rods 24.
is integrally fixed by. Furthermore, the fixing plates 18, 20 are integrally fixed by two tie rods 28.

A metal melting chamber 30 is provided for melting die cast metal. Suitable die casting metals include metals such as high purity aluminum, although other suitable alloys may also be used. Molten metal is conveyed by a not-shown ladle from the melting chamber 30 through the opening 31 and into the cold chamber sleeve 340 entry opening 35 along a travel path 32 shown in broken lines. A shot cylinder 36 is provided to move the filled molten metal from the cold chamber into the cavity. Further, the hydraulic crab knit 38 applies a tightening force to the movable tightening plate as will be described in detail below.

Also, as shown in FIG. 1, a fixed compensator 42 is provided with a compensating function to adjust the internal volume of the cavity to accommodate rotor bodies having various stacking heights. The correction device 42 is a fixed plate 14.16
fixed between.

A rotor removal chute 52 is provided for guiding the rotor to a rotor removal conveyor 54 or other suitable conveying means after removal from the turret 22. Also,
A rotor stack mounting portion 56 and a mounting conveyor 57 are provided as described below. Although the invention is illustrated as an apparatus for manufacturing rotors, the invention is not limited to this use, but can be applied to equipment for die-casting other parts.

The turret 22 is shown in detail in FIGS. 2 and 3. For purposes of illustration, a single-cavity turret for casting the rotor of an electric motor is shown in these drawings. However, it is also possible to use a multi-cavity turret that allows a large number of rotors to be cast simultaneously.

In the present invention, the turret 22 is connected to the fixed plate 16.18.
It is mounted on the central turntable pivot par 60, which is also used as a tie bar to secure the turntable.

Sleeve 71 acts as a spacer between fixed plates 14,16. The turret or turntable 22 is rotatable and has three gate biscuit plates 64a, 64b, 64c fixed at positions spaced 120 degrees apart around its periphery. Thus, the turret 22 has three stations, and work is performed at the three stations simultaneously.

Although turret 22 is formed from a suitable material such as mild steel or aluminum, gate biscuit plate 64 is preferably formed from tool steel.

This is because the high-temperature die-cast metal contacts only the gate biscuit plate, so durability against the high temperature is required, but the turret 22 is not affected by the high-temperature molten metal. Gate biscuit plate 64 is removably secured to turret 22 by any suitable means. Also,
The gate biscuit plate 1-64 can be conventionally water cooled and optionally lubricated.

The most important feature of the invention is that the work for die-casting parts is divided into three stations, the work at each station is completed simultaneously, and the time required is approximately equal for all stations. It is that you are. The factors that determine the cycle time of the entire process are the weight of the shot and the solidification time of the metal. Correction and casting operations are performed at the first station. A second station performs installation and removal operations, and a third station performs pin pushing and trimming operations.

In this embodiment, the casting operation is shown in FIG.
This is done at the gate biscuit plate 64a located at the 2 o'clock position. A cavity 62 is provided within a liner sleeve 63 mounted on the turret 22, into which a rotor stack is mounted as will be described below. The sleeve 63 forming each cavity 62 is manufactured from hardened tool steel. A runner or sprue cavity 66 is provided for transporting hot molten metal from the cold chamber by the shot cylinder 36, as will be discussed in more detail below. In this manner, hot molten metal is forced into the cavity 62.

Additionally, a mechanism is required for extremely accurately positioning the rotary turret 22 each time it is rotated and indexed. In this embodiment, when the turret 22 is stopped at the indexed position, a locking cylinder (not shown) is used to stop the turret 22 at the indexed position.
2 is locked precisely in place, and then the correction and casting operation begins.

FIG. 4 is a partially sectional front view showing a portion of the die casting apparatus 10, showing the tightening '1atR1 correction device 42 and the movable die plate gate end. The fixed compensator 42 includes a conventional double-acting compensator cylinder 70 that moves the turret 22 through the compensation cavity 72 to the right and through the opening in the fixed plate 16 after the turret 22 has been indexed. It is moved to a position where it partially extends into the sleeve 63 to form the left side portion of the rotor cavity. At the same time, the movable die plate 74 or the clamping plate with the gate end is moved by the clamping cylinder 40 into a position where it abuts the gate biscuit plate 64. A movable gouging plate 74 forms the left part of the rotor cavity. The casting operation is thus prepared.

One advantage of the present invention is that movable gouging plate 74 is relatively small and lightweight, and its travel distance is relatively short. In the side gate type die casting apparatus of this embodiment, the die plate 74 moves by 8.9 am (3.5 inches) from the fully open position to the fully closed position, but the range of movement can also be increased. For example, when the present invention is used in a pin gate weapon station, the die plate travel distance is approximately 7.5 inches. In the case of pin gate type, 8. as turret clearance.
9am (3,5 inches) and 1 for gate removal
Divide into 0.2 cm (4 inch) and provide in two stages. In this way, not only is the lightweight die plate 74 more easily moved, but the relatively short distance the die plate 74 has to travel can further save cycle time.

FIG. 5 shows the correction cavity 72 moved into the left side portion of the slit 63 of the turret 22 by the correction cylinder 70. At the same time, movable die plate 74 is shown in a closed position abutting the left side of turret 22. Further, the cold chamber sleeve 76 extending through the open lower portion 7 of the fixed plate 18 is supplied with molten metal from the schematically shown taker bear 8, and the fixed shot cylinder 36 moves the shot rod 80 to the left. The ram 82 is arranged to force hot molten metal through the runners of the gouging plate 74 and into the cavity.

FIG. 9 shows a completed rotor to illustrate the operation of the die casting device. The rotor consists of a stack of mild steel plates 92 held together by removable stack pins 94.

Stack pin 94 is disposed within hole 95 formed by aligning the center hole of each laminate. Each of the laminates has a plurality of openings arranged along its outer periphery. The laminates are stacked such that the outer openings are aligned to form a series of twisted holes through each laminate. By injecting hot molten metal into the channels formed by these twisted holes, a series of conductor bars are formed in the well-known base rotor shown.

A pair of end rings 98,99 are provided to connect the conductor bar 96, thereby allowing current to flow to the rotor rotating within the stator of the electric motor. The stacking height of the laminates is a matter of designer choice and is determined by the required characteristics of the electric motor and its application. Furthermore, the diameter of the rotor also varies depending on the characteristics and application of the electric motor.

6, 7 and 8 show tools for manufacturing rotors by die casting.

FIG. 6 shows a correction cavity 72 driven by a correction cylinder 70 housed within fixed correction device 42 and rod 106. As can be easily seen from the cross-sectional view of the correction cavity 72, the end rings 9 of the rotor 90 are formed within the cavity 109 of the correction cavity 72.

Sleeve 63 has threaded fitting 108 disposed within its opening.
, and is thereby fixed within the turret 22.

Further shown in FIG. 6 is a gate cavity 110 secured to the movable die plate 74 by threaded fittings 112. Gate cavity 110 includes an end ring cavity 113 for forming end ring 98 of rotor 90 . Additionally, gate cavity 110 includes a runner cavity 114 through which hot molten metal passes as it moves from cold chamber sleeve 76 into cavity 62 . Each tool shown in FIG. 6 is one of the turrets 22.
It can be installed at the 2 o'clock position.

FIG. 7 shows a stack pin 94 from a completed rotor 90.
A tool is shown for extruding and trimming the runner or sprue 116. The stem extrusion rod 120 is driven by a hydraulic cylinder as described below. Engaged to the rod 120 is a luscious stem 122 for pushing the stack pin 94 out of the finished rotor 90.

The trim die and stripper assembly 124 also includes a trim die 126 attached to a stripper 130. Between the trim die 126 and the stripper 130,
A gap 128 is provided to allow trim die 126 to move axially relative to stripper 130 as described below.

The tool shown in FIG. 7 is mounted at the 4 o'clock station of turret 22 adjacent gate biscuit plate 64b of FIG.

Figure 8 shows the Gate Bisquera from Figure 2!・Plate 64
An installation/removal tool is shown housed in the 8 o'clock station of turret 22 near c. Mounting rod 132 engages feed button 134 to mount rotor stacks 94 within cavity 62 of turret 22 . Additionally, a feed sleeve 136 is shown into which the completed rotor 90 is pushed by the mounting rod 132 and feed button 134 to push the stack pins 94 out of the finished rotor 90 and to remove the runners at the press-i-palimming station. removed.

FIGS. 10a, 10b, and 10c show the corrector ! at the 12 o'clock position of the turret 22. Each process performed at the J5 construction station is illustrated.

In FIG. 10a, the compensation cavity 72 is connected to the turret 2.
The sleeve 63 of No. 2 is placed at the die-casting position. The correction cavity 72 engages the left side of the stack 92. On the right side of the turret 22, the movable die plate 7
4 has been moved into the die casting position by a clamping cylinder 40.

At the same time, the gate side protruding cylinder 140 is located behind the movable gouging plate 74 on the right side of the turret 22.

This cylinder 140 is an auxiliary device that is only needed if the rotor is designed for a greater shrinkage or interference fit in the mold on the gate side. Therefore, the cylinder 140 is used only when it is necessary to prevent the rotor from remaining on the gate side. In use, the cylinder 140 is manipulated forward and simultaneously retracted to tighten to help the rotor remain properly on the turret side.

In contrast to conventional die casting machines where the moving distance of the movable gouging plate is relatively large, in the side gate type die casting machine described above, the moving distance of the movable gouging plate 74 is only 8.9 am (3.5 inches). Also,
As mentioned above, in the case of pin gating type die casting equipment, the moving distance of the movable guide plate is approximately 19
．． 1an (7°5 inches).

Also shown, cold chamber sleeve 76
is in a position where it can be filled with molten metal, and when filled, the ram 82 transfers the molten metal to the cavity 109 in the compensation cavity 72 and the cavity 1 in the gate cavity 110 through the runner passage by the operation of the shot rod 80.
13 and the openings of the laminate 92 are aligned and extruded into the channel formed.

In Figure 10b, the ram 82 is moved to a position where it forces molten metal into the cavity and the shot is held until the metal in the cavity solidifies. At this point, the correction cavity 72 has moved to the left and the end ring 99 has already solidified. The gate side injection cylinder 140 remains located on the rear side.

In FIG. 10c, the movable die plate 1 74 is retracted integrally with the shot sleeve 76, and at the same time the gate side injection cylinder 140 moves forward. Ram 82 is in a retracted position such that turret 22 can rotate integrally with complete rotor 90 and sprue or runner 116 attached thereto.

FIG. 11 shows a perspective view from the rear of a die casting apparatus according to the invention. A pin ejecting cylinder 146 and a trimming cylinder 148 are shown in the figure. Additionally, a trim die stripper assembly 124
is illustrated.

Additionally provided is a pin discharge pan 150 for receiving stack pins 94 extruded from the finished rotor 90 and a gate scrap discharge chute 152 for receiving discarded sprue or runners.

12a-12e illustrate the trim pin extrusion process performed at a station located at the 4 o'clock position of turret 22. In FIG. 12a, the rotor 9
0 cast and solidified sprue or runner 116
After the turret 22 is rotated to move from the station at the 12 o'clock position to the station at the 4 o'clock position while keeping the extruder stem 122 attached, the extrusion stem 122 remains stationary at the rear position. At this point, trim die assembly 124 is likewise stationary in the rearward position.

An important feature of the present invention is a simple and effective method and apparatus for trimming sprue 116 from finished rotor 90. The trim assembly 124 is shown in FIG.
A gap 128 formed by a spring 0 or other suitable means, as shown in FIGS. 12a and 12b.
1-rim die 126 spaced from stripper 130 by. Trim die 126 is secured to stripper 130 by a plurality of spring loaded bolts 156.

In FIG. 12b, trim assembly 124 has been moved toward rotor 90 so that stripper 130 abuts the left side of rotor 90. In FIG. At this point, the stripper 130 is only in contact with the rotor 90 and is not moving it. Also, trim die 126 only engages sprue 116.

As shown in FIG. 12c, the stripper 130 is further moved to the rotor 90. Move to the left and press trim die 12.
6 continuously engages the runner or sprue 116 between the trim die 26 and the stripper 130.
Close 28. In this way, the sprue 116 is separated from the rotor 90, but is tightened and held at the position where it abuts the sleeve 63.

In Figure 12d, breather stem 122 has been moved to the right to engage stack pin 94a. In this way, the presser stem 122 continuously moves to the right, pushing the stack pin 94a into the opening 160 of the slipper 130, and pushing out the stack pin 94b held in the opening 160 into the open cavity 158. , into the pin ejection pan 150 shown in FIG. Stack pin 94a held within opening 160 of stripper 130
is removed from its position by the next pin extrusion operation.

When the pin pushing operation is completed, the presser stem 122 is again able to move to the left. Also, as can be seen in FIG. 12e, the trim assembly 124 moves to the right to release the clamping force on the sprue 116, and the separated sprue 116 is placed in the gate scrap discharge chute 152 shown in FIG. It's supposed to fall. At the same time, due to the lost motion caused by the spring-loaded bolt 156, the trim die 126 and the stripper 130 are connected again.
A gap 128 is provided between the two.

13a to 13d illustrate the process of removing the finished rotor 90. The mounting/dismounting station is located at the 8 o'clock position of the turret 22. Chapter 13a
As shown, the stem 132 and feed button 134 are placed in the retracted position, and the finished rotor 90 is housed in the cavity 62 in the sleeve 63 of the turret 22. Moreover, there are no stack pins in the holes 95 of the stacked body 92 at all.

As shown in FIG. 13b, the stem 132 moves to the right, causing the feed button 134 to push the rotor 90 to the right and from the sleeve 63 to the rotor removal chute 52 shown in FIGS. 13b and 1. Stick out. Also, as shown in FIG. 13c, a new rotor stack 92 with stack pins 94 is now installed within the sleeve 63. The stem 132 and feed button 134 are again placed in the retracted position. As the stem 132 moves to the right, the feed button 134 forces the rotor stack 92 into the cavity 62 and places it in the casting position shown in Figure 13d. As described above, the saucer throat 22 is in a state where it can be rotated and indexed to the 12 o'clock position where high temperature molten metal is injected into the cavity.

As illustrated in FIG.
2 and for attaching the laminate to a mounting member in preparation for attaching it to the sleeve 63 of the turret 22.

The rotor stacks 92 are arranged in a row on the mounting chute 164, and a hinged mounting member 166 receives the rotor stacks. In the illustrated embodiment, one rotor stack 92 is delivered to the sealing member 166 and turret 22 at a time, but in the case of a multi-cavity turret 22, two or more rotor stacks 92 are delivered at a time. laminates can be transported at the same time.

Rotor stacks 92 are moved to mounting member 166 by hydraulically operated cylinder 168. Mounting member 166 pivots upward after attaching rotor stacks 92 and is aligned with turret 22 by hydraulic cylinder 170 . Once this lateral alignment is complete, the rotor laminations 92 are attached to the buttress cylinder 17 with the stem 132.
2 to the turret 22. It should be noted that the attachment process from attachment chute 164 to attachment member 166 proceeds while turret 22 is not in position to receive a new rotor stack 90. A hinged mounting member 166 is moved laterally from the cantilevered position and is positioned to receive the rotor from the transport mechanism. next,
Attachment member 166 is moved inboard and aligned with turret 22.

This die casting apparatus operates as follows. When the turret 22 is indexed in the direction of the arrow shown in FIG. position accurately. Turret 22 is die casting at 12 o'clock.
When in the corrected position, the rotor stack 92 is in the sleeve 63
It is arranged in the cavity 62 of. At the same time, sprue 1
16 is rotated to the 4 o'clock position, which is the pin pushing and trimming position.

At the 8 o'clock position of the turret 22, that is, at the installation/removal position, the complete rotor to be removed is placed in the sleeve 63, and after it is removed, a new stack 92 is installed.

At the casting station, the correction cavity 72 is moved to a position where it abuts the rotor stack 92, and at the same time the movable die plate 74 is moved to a position where it abuts the gate biscuit plate 64 and the turret 22. Molten metal is then injected into the cold chamber sleeve 76 and into the runner cavity 11 by the shot cylinder 36.
4 into the cavity 109.113.

While these operations are being performed at the 122 o'clock station, the stack pins 94 are being pushed out of the complete rotor 90 at the 4 o'clock station, and at the same time the runners or sprues 116 are being trimmed from the complete rotor 90 at the 8 o'clock station. and collected in a suitable container. At the 8 o'clock station, the finished rotor is removed from cavity 62 and loaded onto conveyor 54. A new rotor stack is then installed in the cavity 62 and prepared for die casting. When all operations at the three stations are completed, the turret 22 is indexed and the same operations are repeated.

Work at each station proceeds simultaneously.

The work to be done at each station is determined so that the time required for its completion is as equal as possible. Therefore, no time is wasted at any station by having to wait for work at other stations to be completed. In this way, the cycle time can be set optimally, improving productivity.

FIG. 15 shows a time chart showing the time required for one cycle. As can be clearly seen from the figure, the completion times of the operations performed at the 12 o'clock grain position station, the 4 o'clock position station, and the 8 o'clock position station are approximately equal. It can also be seen from this time chart that the solidification time of the metal is a factor that determines the overall cycle time. Furthermore, it can be seen that the work at each station is done simultaneously. It can also be seen that the time required to rotate the turret 22 is a limiting factor in setting the cycle time. In addition, the work and short time required for tightening is a limiting factor.

A single cavity die casting apparatus according to the present invention has a cycle time of 11.7 seconds to 17.5 seconds for rotors with outside diameters in the range of 2 to 5 inches. I understand that it is within the range. This is a significant improvement over the cycle time of conventional die casting equipment, which was approximately 2 to 3 times longer.

<Effects of the Invention> As described above, according to the present invention, it is possible to obtain an excellent and highly efficient die-casting device that can manufacture die-cast parts such as rotors in a minimum amount of time.

[Brief explanation of the drawing]

FIG. 1 is a front perspective view of a side gate type die casting apparatus according to the present invention. FIG. 2 is a front view of the turret of the apparatus shown in FIG. FIG. 3 is a cross-sectional view of the turret taken along line 3--3 in FIG. 2. FIG. 4 is a front view showing the tightening mechanism of the device shown in FIG. FIG. 5 is a partially sectional front view showing the shot i configuration of the apparatus shown in FIG. FIG. 6 is an exploded view of the cavity tool used in the apparatus shown in FIG. FIG. 7 is an exploded view of a pin extrusion/trimming tool used in the apparatus shown in FIG. FIG. 8 is an exploded view of the installation/removal tool used in the apparatus shown in FIG. FIG. 9 is a cross-sectional view of a die-cast rotor of an electric motor. FIG. 10a is a partial sectional view of the side gate type die casting apparatus of FIG. 1 at the time of shot. FIG. 10b is a similar partial cross-sectional view in the process of holding the shot. FIG. 10c is a partial sectional view similar to FIG. 10a after die casting and before turret indexing. FIG. 11 is a perspective rear view of the apparatus shown in FIG. 1, including pin ejecting means, trimming means and scrap ejecting means; Figures 12a to 12e are partial cross-sectional views of the apparatus shown in Figure 1 during pin extrusion and trimming operations. Figures 13a to 13d are partial cross-sectional views of the device shown in Figure 1 during the installation and removal steps. FIG. 14 is a perspective view partially showing the attachment mechanism of the device shown in FIG. FIG. 15 is a time chart of the apparatus shown in FIG. 10...Die casting device 12...Frame 14.16.18.20...Fixing plate 22...
Rotating turret 24.26.28... Tie rod 30... Melting chamber 31... Opening 32... Conveying path 34... Cold chamber sleeve 35... Inlet opening 36... Shot cylinder 38...・Dynamic crab knit 40...tightening cylinder 42
...Correction device 52...Rotor removal chute 5
4...Rotor removal conveyor 56...Mounting section 57...Mounting conveyor 60
...Pivot par 62...Cavity 63...
Sleeves 64.64a, 64b, 64c--Gate biscuit plate 66...Runner cavity, sprue cavity 70
...Correction cylinder 72...Correction cavity 74.
... Movable die plate 76 ... Cold chamber sleeve 77 ... Opening 78 ... Trap 80 ...
Shot rod 82... Ram 90... Rotor
92...Laminated body 94...Stack pin 95...
- Hole 96... Conductor bar 98.99... End ring 106... Rod 108... Threaded part 109... Cavity 110... Gate cavity 112... Threaded part 113... End ring Cavity 114... Runner cavity 116... Runner, sprue 120... Stem extrusion rod 122... Presser stem 124... Trim die/stripper assembly 126
...Trim die 128...Gap 130...Stripper 132...Mounting rod 134...Feed button 136...Feed sleeve 140...Ejecting cylinder 146...Pin extrusion cylinder, ring 148...・Trimming cylinder 150...Pin discharge pan 152...Gate scrap discharge chute 156...
・Bolt 158...Open cavity 160...Opening 1.64...Mounting chute 166...Mounting member 168.170...Hydraulic cylinder 172...Butsusha cylinder Patent applicant Ichibm Corporation

Claims (10)

[Claims] (1) A complete system including a plurality of functions, comprising a frame having at least two opposing fixed pressure plates, and a rotating turret member disposed between the fixed plates and indexable in at least three positions per period. A die casting device for performing die casting, comprising a plurality of stations corresponding to the three positions, each of which is provided with a working means, and at least one function of the die casting cycle is performed at the same time in each of the stations. and wherein two functions of the die casting cycle are performed at any one of the stations, and the operations performed at each station are determined to take approximately equal amounts of time to complete. die casting equipment. (2) The die casting apparatus according to claim 1, wherein two operations are performed at each station. (3) The station is composed of three stations, and the working means that performs at least one function includes a casting/correction means that operates in conjunction with the first station, and a pin push-out and correction means that operates in conjunction with the second station. Claim 1 comprising trimming means and attachment/detachment means operative in conjunction with the third station.
The die-casting equipment described in section. (4) A patent claim characterized in that the casting/correction means comprises a movable clamping member having an opening, and means for injecting high temperature molten casting material through the opening of the movable clamping member. The die casting apparatus according to item 3. (5) the pin pushing and trimming means includes means for tightening the sprue portion of the part to be cast and means for separating the sprue portion from the part by moving the part a predetermined distance with respect to the sprue part; A die casting apparatus according to claim 3, characterized in that it comprises: (6) The rotating turret member is provided at regular intervals around the rotating turret member, and has a plurality of cavities for forming a rotor in cooperation with the working means, and the casting/correcting means is the turret member. said pin extrusion and trimming means cooperate with said turret member to extrude pins and remove sprue from the cast rotor, and said attachment and removal means cooperate with said turret member. working together to attach the rotor stack to the turret member, and the casting/compensating means, the pin pushing/trimming means, and the attaching/removing means being at each position of the turret member for approximately equal time; The die casting apparatus according to claim 1, characterized in that the operations are performed substantially simultaneously. (7) A method for die-casting a rotor of an electric motor in a die-casting apparatus having a rotating turret and first, second and third stations each having a plurality of working means operating in conjunction with said turret. a step of correcting the thickness of the laminated body of the rotor and casting the first rotor at the first station within a predetermined time; and simultaneously with the correction and casting step at the first station. at the second station within a predetermined time.
Push out the alignment pin from the rotor, and
At the same time as the step of trimming the runner from the rotor and the correction/casting step at the first station, removing the third rotor from the turret at the third station approximately within the predetermined time, and then A die casting method comprising the step of attaching a laminated body of rotors to the turret. (8) The die casting method according to claim 7, wherein the casting step is performed through an opening in a movable clamping member. (9) The trimming step includes tightening the sprue of the cast rotor, moving the second rotor into the cavity of the turret by a predetermined distance, and separating and removing the sprue. The die casting method according to claim 7, characterized in that: (10) The working means including the cavity has a partially movable part, and the movable part is within a distance range of 7.6 cm (3 inches) to 20.3 cm (8 inches) from the retracted position to the actuated position. The die casting method according to claim 7, characterized in that the die casting method is moved.