JP2000135554A - Core lamination thickness correction pressure control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a core lamination thickness correction pressure control device that the core lamination thickness correction pressure control can be easily and surely carried out. SOLUTION: This core lamination thickness correction pressure control device 10 has an input part 11 for inputting a desired lamination thickness selection information Sk concerning the total thickness of the laminated core 30. To the input part 11, a core pressure control part 12, which seeks a pressure information Ak to be given to the laminated core 30 based on the lamination thickness selection information Sk to be inputted in the input part 11, is connected. To the core pressure control part 12, a drive control part 13 is connected for outputting a driving signal to a pressing mechanism 21 so as to press the laminated core 30 based on the pressure information Ak obtained at the core pressure control part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core lamination correction pressure control used in a motor rotor casting apparatus having a pressing mechanism for pressing a laminated core and injecting aluminum into the core to cast a motor rotor. Related to the device,
The present invention relates to a core lamination correction pressure control device capable of easily and reliably controlling a core lamination correction pressure.

[0002]

2. Description of the Related Art As a rotor casting apparatus for a motor, a die into which a laminated core is inserted, a pressing mechanism for pressing the laminated core, an aluminum injection mechanism for injecting aluminum into the laminated core, and a core. There is a casting device provided with a thickness correction pressure control device.

[0003] An iron core for a core is formed from an iron plate having a thickness of, for example, about 0.5 mm into a substantially circular shape having a notch for a slot portion by pressing or the like. The plurality of iron cores are assembled and stacked together using "caulking" or the like, and form a core having a slot portion extending in the axial direction on the outer periphery. Core diameter and total thickness (length) of laminated cores
Is determined by the specifications of the motor rotor to be cast, for example, the capacity of the motor.

[0004] The total thickness of the laminated cores usually varies about ± 1 mm. Such variation means that a gap may exist between the cores forming the core. If there is a gap between the iron cores, the aluminum to be injected enters the gap, resulting in poor quality of the cast motor rotor.

[0005] Therefore, it is necessary to apply an appropriate pressure to the laminated cores by the core thickness correction pressure control device and the pressing mechanism to prevent the formation of a gap between the iron cores. As the pressing mechanism, a direct pressure type cylinder mechanism, a wedge type pressing mechanism,
There is a flat spring type pressing mechanism and the like.

The conventional core thickness correction pressure control device is constituted by a pressure control valve for directly controlling a pressing force by a pressing mechanism.

The operation of such a core thickness correction pressure control device (pressure control valve) is manually performed by an operator using a comparison table between the mold and the correction pressure.

[0008]

As described above, conventional core thickness correction pressure control requires manual operation of a pressure control valve by an operator. It is difficult for the operator to manually operate the pressure control valve with high accuracy, and it is difficult to perform the core thickness correction pressure control with reproducibility, for example, variations occur for each operator.

Further, every time the mold is changed, for example, the core diameter or the total thickness of the core is changed, it is necessary to operate the pressure control valve to apply the corresponding pressure to the laminated cores.
When the operator operates the pressure control valve for each mold, workability and operability are lacking. This is a bigger problem, especially when the pressure control valve is located at a position where it is difficult to operate. In addition, access to a running casting machine for operation of the pressure control valve can be dangerous.

On the other hand, when the core thickness correction pressure is not properly controlled, if the core thickness correction pressure is insufficient, a gap is generated between the iron cores as described above. If it is excessive, traces of the pressing mechanism remain on the core on the pressing mechanism side, leading to a decrease in the degree of adhesion to the end ring portion (aluminum portion) and deformation of the core, resulting in an adverse effect on quality.

The present invention has been made in view of the above points, and an object of the present invention is to provide a core lamination correction pressure control device capable of easily and reliably performing the core lamination correction pressure control. Aim.

[0012]

SUMMARY OF THE INVENTION The present invention has a pressing mechanism for pressing a laminated core, and a core stack thickness used in a motor rotor casting apparatus for injecting aluminum into the core to cast a motor rotor. In the correction pressure control device, an input unit for inputting desired stack thickness selection information regarding the total thickness of the stacked cores, and pressure information to be given to the stacked cores based on the stack thickness selection information input to the input unit A core pressure control unit that obtains, based on the pressure information obtained by the core pressure control unit, a drive control unit that outputs a drive signal to the pressing mechanism,
And a core thickness correction pressure control device.

According to the present invention, it is sufficient for the operator to input desired stack thickness selection information relating to the total thickness of the core, and the core pressure control section obtains the pressure information and the drive control section automatically presses the information. Since the drive signal is output to the mechanism, the core thickness correction pressure control can be easily and reliably performed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a configuration of a core thickness correction pressure control device according to a first embodiment of the present invention. FIG.
As shown in FIG. 1, the core thickness correction pressure control device 10 according to the first embodiment of the present invention has a pressing mechanism 21 for pressing the laminated cores 30, and injects aluminum 31 into the cores 30 to rotate the motor rotor. Rotor casting device 20 for casting
(For example, a die casting machine or a dedicated rotor machine).

The core thickness correction pressure control device 10 has an input unit 11 for inputting desired stack thickness selection information Sk regarding the total thickness of the laminated cores 30. The input unit 11 is connected to a core pressure control unit 12 that obtains pressure information Ak to be given to the laminated cores 30 based on the stack thickness selection information Sk input to the input unit 11. Core pressure control unit 1
A drive controller 13 that outputs a drive signal to the pressing mechanism 21 based on the pressure information Ak obtained by the core pressure controller 12 is connected to 2.

The specification of the total thickness of the laminated cores 30 is determined by the specification of the rotor for the motor to be cast, and therefore by the mold 22 of the casting apparatus 20. Therefore, the input unit 11
In advance, a plurality of stack thickness selection information S1 to Sn are set (stored) in advance in accordance with a plurality of molds 22 of the selectable casting apparatus 20.
Have been. The input unit 11 further includes a selection switch unit 11a, so that the operator can input the stack thickness selection information Sk from a plurality of stack thickness selection information S1 to Sn by a selection method. FIG. 1 shows a case where n = 7.

The form of the selection switch section 11a is optional. For example, Dip switch,
Dial switches, numeric key switches, and the like are applicable.

The core pressure control unit 12 obtains pressure information Ak to be given to the laminated cores 30 based on the stack thickness selection information Sk selected at the input unit 11. The pressure information Ak is information that is set in accordance with the total thickness of the laminated cores 30, and the core pressure control unit 12
, Pressure information A1 to An corresponding to each of the plurality of stacked thickness selection information S1 to Sn is set (stored) in advance. The core pressure control unit 12 further includes a search unit, and searches for and outputs pressure information Ak corresponding to the stack thickness selection information Sk from a plurality of stack thickness selection information A1 to An.

The drive controller 13 comprises, for example, an excitation current controller 13a and a proportional electromagnetic control valve 13b.
The exciting current control unit 13a determines an input current to be input to the proportional electromagnetic control valve 13b based on the pressure information Ak obtained by the core pressure control unit 12, and the proportional electromagnetic control valve 13b is determined by the exciting current control unit 13a. Based on the input current, pressure oil from a hydraulic source (not shown) is controlled, and a drive signal is output to the pressing mechanism 21 in the form of hydraulic pressure of the pressure oil. The pressing mechanism 21 is driven by a driving signal such as an oil pressure.
The stacked cores 30 are pressed by a pressure based on the pressure information Ak. For example, the pressure information Ak is 100
kgf / cm ² (10 MPa).

The core thickness correction pressure control device 10 according to the present embodiment includes a core 30 pressed by the pressing mechanism 21.
Has a pressure sensor 14 for measuring the pressing force. The pressure sensor 14 includes a comparison unit 15 that compares a measurement signal from the pressure sensor 14 with pressure information from the core pressure control unit 12.
Is connected. The comparator 15 feeds back the output signal to the drive controller 13 to correct the drive signal from the drive controller 13 to the pressing mechanism 21.

In the present embodiment, the comparing section 15
The measurement signal from the pressure sensor 14 is compared with the pressure information Ak from the core pressure controller 12 with a certain tolerance B, and the measurement signal from the pressure sensor 14 is within the range of the pressure signal Ak ± B. Is satisfied, the core thickness correction pressure control is terminated.

The permissible error B is determined in advance by a predetermined value.
Is set (stored). The permissible error B is
0 is determined in consideration of variations such as pressure fluctuation during operation, and is, for example, 10 kgf / cm ² (1 MPa).

The tolerance B may be variable,
For example, a plurality of allowable errors B1 to Bn are set in the input unit 11 or the core pressure control unit 12 in advance, and the input of the stack thickness selection information Sk by the input unit 11 causes the stack thickness selection information Sk
Is the optimum tolerance B for the total thickness of the corresponding core 30
k may be selected and input to the comparison unit 15.

The smaller the allowable error B (Bk) is set, the more accurate the core thickness correction pressure control can be achieved.

In this embodiment, the permissible error B is used to set the upper and lower limits of the permissible range, but may be used to set only the lower limit. In this case, when the measurement signal from the pressure sensor 14 exceeds the pressure signal Ak-B, the core thickness correction pressure control ends.

The measurement signal from the pressure sensor 14 used for comparison in the comparison unit 15 is not an instantaneous measurement value,
It is preferable to use an average value over a certain period of time (for example, several seconds). As a result, it is possible to perform control excluding the influence of the fluctuation of the measured value.

Further, the core thickness correction pressure control device 10 of the present embodiment provides a measurement signal (current pressure) by the pressure sensor 14.
And a display device 17 for displaying pressure information Ak (corrected pressure) by the core pressure control unit 12 and an allowable upper limit and an allowable lower limit obtained from the pressure information Ak and the allowable error B. The display device 17 has a current pressure window 17a, a corrected pressure window 17b, an allowable upper limit window 17c, and an allowable lower limit window 17d for displaying the current pressure, the corrected pressure, the allowable upper limit and the allowable lower limit, respectively. It may be composed of a CRT screen or the like.

Next, the operation of the core thickness correction pressure control device 10 having the above configuration will be described with reference to FIG.

First, the laminated core 30 is inserted into the mold 22 of the casting apparatus 20 (STEP 1). Next, the mold 22 is closed, and the pressing mechanism 21 contacts the laminated core 30 (STEP 2).

At the time of initial operation (initial stage),
The operator selects and inputs the stack thickness selection information Sk corresponding to the mold 22 to the input unit 11 (STEP 3). When the stack thickness selection information Sk is input to the input unit 11, the core stack thickness correction pressure control device 10 obtains the corresponding pressure information Ak (correction pressure) by the core pressure control unit 12 (STEP).
4).

Subsequently, the pressure information A is
Then, a drive signal is output according to k (STEP 5), and the pressing mechanism 21 is driven to press the stacked cores 30 (STEP 5).
EP6).

Next, the pressure sensor 14 measures the pressing force of the core 30 pressed by the pressing mechanism 21 (STEP).
7).

The comparison section 15 compares the measurement signal (current pressure) from the pressure sensor 14 with the pressure information Ak from the core pressure control section 12 (STEP 8), and the measurement signal from the pressure sensor 14 is compared with the pressure signal Ak ±. B, the core thickness correction pressure control is terminated and the injection process is started (STEP
10). The measurement signal from the pressure sensor 14 is a pressure signal Ak
If it is out of the range of ± B, the output signal is
3, the drive signal from the drive control unit 13 is corrected, and the core thickness correction pressure control is further continued (ST
EP9).

Each window 17a, 17b, 17 of the display device 17
In each of c and 17d, corresponding information is displayed as needed.

When the motor rotor is cast and extracted by injection of aluminum 31 and then repeatedly cast using the same mold 22, the laminated core 30 is inserted into the mold 22 again. (STEP 1). Then, the mold is closed and the pressing mechanism 21 is laminated on the core 30.
(STEP 2).

In such a repetitive operation, since the input of the stack thickness selection information Sk and the search of the pressure information Ak have already been performed, the drive control unit 13 immediately outputs a drive signal corresponding to the pressure information Ak ( (STEP 5), the pressing mechanism 21 is driven to press the stacked cores 30 (S5).
TEP6). Hereinafter, the same steps as in the initial operation (STEP
7 to STEP 10) are repeatedly performed.

As described above, according to the present embodiment, the core thickness correction pressure control can be easily and reliably performed. Further, reproducibility, safety, workability and operability of the core thickness correction pressure control are also improved.

Further, the present embodiment has the display device 17, and the operator can confirm various information, so that the operability is further improved.

Next, FIG. 3 shows a schematic configuration diagram of a core thickness correction pressure control device according to a second embodiment of the present invention. As shown in FIG. 3, the core thickness correction pressure control device 10 according to the present embodiment
Although the abnormality output unit 16 is connected to the comparison unit 15, the output signal of the comparison unit 15 is not fed back to the drive control unit 13.

The other structure is the same as that of the first embodiment shown in FIG. In the second embodiment,
The same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

The abnormality output section 16 outputs abnormality information based on the output signal of the comparison section 15, for example, by generating an alarm or turning on a lamp. When the abnormality information is output by the abnormality output unit 16, the aluminum injection process (see FIG. 4: STE)
P20) is stopped.

FIG. 4 shows the operation of the core thickness correction pressure control device 10 according to the second embodiment having the above configuration.

As shown in FIG. 4, steps 11 to 17 of the operation of the present embodiment correspond to steps 1 to STE of the operation of the first embodiment described with reference to FIG.
It is the same as up to P7.

After STEP 17, the comparison unit 15 compares the measurement signal (current pressure) from the pressure sensor 14 with the pressure information Ak (correction pressure) from the core pressure control unit 12 (STEP 17).
EP18), when the measurement signal from the pressure sensor 14 falls within the range of the pressure signal Ak ± B, the core thickness correction pressure control is terminated and the injection process is started (STEP 20). If the measurement signal from the pressure sensor 14 is out of the range of the pressure signal Ak ± B, the output signal is output to the abnormality output unit 16, and the abnormality output unit 16 outputs abnormality information (STEP 19).

As described above, according to the present embodiment, the core thickness correction pressure control can be easily and reliably performed. Further, by effectively utilizing the abnormality information output by the abnormality output unit 16, further improvement of the control can be effectively achieved.

Next, as an example of a casting apparatus using the core thickness correction pressure control apparatus 10 of the first embodiment described above, a rotor casting apparatus 40 for a direct pressure motor will be described with reference to FIG. .

The rotor casting apparatus 40 for a direct pressure motor includes a fixed plate 41a and an aluminum injection mechanism 41b as dies.
Fixed type 41 provided with a runner ejector 41c
And a first intermediate mold 42 in which a first end ring mold 42a is formed, a second intermediate mold 43 into which the laminated core 30 and the stacking correction insert 51 are inserted, and an extrusion pin 45 penetrating therethrough. A movable mold 44 for accommodating a movable cylinder 52 slidable on the side of the second intermediate mold 43 around the extrusion pin 45 is provided.

In the insert 51 for stack thickness correction, a second end ring mold 51a is formed on the core 30 side. Further, the insert 51 for stack thickness correction and the movable cylinder 52 are joined, and constitute the pressing mechanism 21. The movable cylinder 52 is connected to the drive control unit 13 (the excitation current control unit 13a and the proportional electromagnetic control valve 13b) via the hydraulic pressure transmission mechanism 53, and is movable by the hydraulic pressure (drive signal) from the drive control unit 13. It moves relatively to the mold 44, and thereby the stacking thickness correcting insert 51 presses the laminated core 30.

The rotor casting apparatus 40 for a direct pressure type motor first has the core 30 laminated in the second intermediate mold 43.
Is inserted (see FIG. 2: STEP 1). Next, the second intermediate mold 43 and the movable mold 44 are closed and the stacking correction insert 51 is closed.
Is brought into contact with the laminated core 30 (STEP 2).

On the other hand, the operator operates the input unit 1 during the initial operation.
The selection information Sk corresponding to the metal mold is selected and input for 1 (STEP 3). Core thickness correction pressure control device 10
When the stack thickness selection information Sk is input to the input unit 11, the core pressure control unit 12 obtains the corresponding pressure information Ak (STEP 4), and the drive control unit 13 generates the pressure information A.
The movable core 52 is moved in accordance with k, and the stacked cores 30 are pressed by the insert 51 for stack thickness correction (STE).
P5, STEP6).

After the core thickness correction pressure control according to the flow shown in FIG. 2 is completed, the molten metal is injected into the mold by the aluminum injection mechanism 41b after confirming the mold clamping pressure increase. This state is shown in FIG.

Thereafter, the pressing of the stacked cores 30 by the pressing mechanism 21 is released, and after a certain mold cooling period, the mold is opened and the cast motor rotor is taken out.

As described above, in the rotor casting device 40 for a direct pressure motor, the core thickness correction pressure control device 10 of the first embodiment has an extremely useful effect.

The rotor casting device 40 for a direct pressure motor
It is clear that the same advantageous effects can be obtained by using the core thickness correction pressure control device 10 of the second embodiment.

Further, as another example of the casting apparatus using the core thickness correction pressure control apparatus 10 of the first embodiment, a rotor casting apparatus 60 for a wedge type motor is shown in FIG. The rotor casting device 60 for a wedge-type motor includes a pressing mechanism 21 that includes a support-side wedge portion 61, a movable-side wedge portion 62, and a drive cylinder 63 that drives the movable-side wedge portion 62 with respect to the support-side wedge portion 61. Movable wedge 62 and support wedge 6
1 and a stacking thickness correction insert 64 which is moved by a relative movement with respect to 1.

Also in such a wedge-type motor rotor casting apparatus 60, the core thickness correction pressure control apparatus 10 of the first embodiment has an extremely useful effect.

Also, a rotor casting apparatus 60 for a wedge type motor.
It is apparent that the use of the core thickness correction pressure control device 10 according to the second embodiment also has a similarly useful effect.

[0059]

As described above, according to the present invention, the core thickness correction pressure control can be easily and reliably performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a core thickness correction pressure control device according to the present invention.

FIG. 2 is a flowchart showing the operation of the core thickness correction pressure control device of FIG. 1;

FIG. 3 is a schematic configuration diagram showing a second embodiment of a core thickness correction pressure control device according to the present invention.

FIG. 4 is a flowchart showing the operation of the core thickness correction pressure control device of FIG. 3;

FIG. 5 is a schematic diagram showing a rotor casting apparatus for a direct pressure motor using the core thickness correction pressure control apparatus of FIG. 1;

FIG. 6 is an explanatory diagram showing a rotor casting device for a wedge-type motor using the core thickness correction pressure control device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 core thickness correction pressure control device 11 input unit 12 core pressure control unit 13 drive control unit 13a excitation current control unit 13b proportional electromagnetic control valve 14 pressure sensor 15 comparison unit 17 display device 20 rotor casting device for motor 21 pressing mechanism 22 Mold 30 Core 40 Rotor for direct pressure type motor 41 Fixed type 41a Fixed plate 41b Aluminum introduction mechanism 41c Runner ejector 42 First intermediate mold 42a First end ring mold 43 Second intermediate mold 44 Movable mold 45 Extrusion pin 51 For thickness correction Nesting 51a Second end ring type 52 Movable cylinder 53 Hydraulic pressure transmission mechanism 60 Rotor casting device for wedge-type motor 61 Supporting wedge part 62 Movable wedge part 63 Drive cylinder 64 Nesting for thickness correction

Claims (4)

[Claims] A core thickness correction pressure control device for use in a motor rotor casting apparatus having a pressing mechanism for pressing a laminated core, injecting aluminum into the core, and casting a motor rotor. An input unit for inputting desired stack thickness selection information regarding the total thickness of the cores, and a core pressure control unit for obtaining pressure information to be given to the stacked cores based on the stack thickness selection information input to the input unit. A core thickness correction pressure control device, comprising: a drive control unit that outputs a drive signal to a pressing mechanism based on pressure information obtained by the core pressure control unit. 2. A pressure sensor for measuring a pressing force of a core pressed by a pressing mechanism, and a comparison unit for comparing a measurement signal from the pressure sensor with pressure information from a core pressure control unit, 2. The core thickness correction pressure control device according to claim 1, wherein the drive signal from the drive control unit is corrected by the signal. 3. A pressure sensor for measuring a pressing force of a core pressed by a pressing mechanism, a comparison unit for comparing a measurement signal from the pressure sensor with pressure information from a core pressure control unit, and a signal from the comparison unit. The core thickness correction pressure control device according to claim 1, further comprising: an abnormality output unit that outputs abnormality information according to: 4. The comparison section compares the measurement signal from the pressure sensor with pressure information from the core pressure control section with a certain tolerance, and the input section inputs the tolerance to the comparison section. The core thickness correction pressure control device according to claim 2 or 3, wherein: