JPS646999Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a device for detecting the lifting stop position of a laminated core receiving cylinder in a progressive die device for manufacturing a laminated core.

[Conventional technology]

In a progressive die device for manufacturing a laminated core, at a station that punches out the shape of a laminated core piece from a strip, a punch that is pressed down with each press stroke pulls the laminated core piece into a lower die for the shape cutting process, and It is caulked and joined to the previously pulled laminated core piece in the mold.

The laminated core manufactured by this method has the cut and raised protrusions of the laminated core piece that is later drawn into the hole that is the cut and raised protrusion mark of the laminated core piece that has been punched out and placed in the die. The protrusion is press-fitted and caulked by the pressurizing force of the punch and the cylinder supporting the pedestal that receives the laminated core piece from below, and is integrally connected. In addition, although the above laminated core pieces are cut and raised every predetermined number of pieces, and although there are no protrusions, there are holes where the cut and raised protrusions remain. The laminated core piece that is pulled into the die and the subsequent pieces that are pulled out following the laminated core piece become uncoupled due to the presence of the laminated core piece. That is, the laminated core pieces without cut and raised protrusions are placed at the lowest position, and the laminated core pieces that are pulled out until the next laminated core piece without cut and raised protrusions are combined together. It becomes one product laminated core.

In such a mold device, when taking out the product laminated core from the bottom of the die, the cylinder supporting the pedestal is retracted, the product on the pedestal that has descended accordingly is taken out, and then the cylinder is extended again. When the limit switch, which is located at a fixed position corresponding to the position where the pedestal contacts the laminated core piece, is activated by the cylinder being extended by a predetermined amount,
The cylinder was controlled to stop expanding.

[Problem that the invention attempts to solve]

However, if the amount of rise of the cylinder is controlled as described above, if the thickness of the product changes, the amount of rise of the pedestal until it comes into contact with the laminated core piece will also change.
Not only did the mounting position of the switch have to be changed, but it was also extremely difficult to adjust the mounting position. Therefore, if the lifting amount of the pedestal is insufficient due to the mounting position of the switch, the period of caulking due to the pressurizing force between the punch and the cylinder supporting the pedestal will be shortened by the amount of the shortage. If there is a risk that sufficient caulking will not be performed, and if the amount of rise of the pedestal exceeds the position where it contacts the laminated core piece, the laminated core piece punched into the die will be pushed back, causing damage to the next stage. This becomes a major obstacle to punching.

The present invention was developed in view of the above-mentioned circumstances, and is a lifting cylinder for laminated cores that can reliably detect the position where the cradle contacts the laminated core piece while the cylinder is rising after taking out the product. An object of the present invention is to provide a stop position detection device.

[Means for solving problems]

According to the present invention, a small rod is inserted movably in the axial direction into the rod of the cylinder and has its tip connected to a cradle, and a spring disposed between the cradle and the rod of the cylinder. and a switch for generating a rise stop signal for stopping the rise of the cylinder in response to the relative movement of the small rod with respect to the rod in the axial direction.

[Effect]

While the cylinder is rising after taking out the product,
When the cradle comes into contact with the laminated core piece and a load is applied to the cradle, the small rod retracts into the rod of the cylinder against the elastic force of the spring, and the movement of the small rod at this time is transferred to the switch. Therefore, the cylinder is detected, and a rise stop signal is generated to set the cylinder rise position at the time of this detection as the cylinder rise stop position.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, an embodiment of a progressive mold apparatus for manufacturing a laminated core to which a laminated core receiving cylinder according to the present invention is applied will be described.

FIG. 1 is a cross-sectional view showing a station for punching, caulking, and skewing a core piece for a rotor core in a progressive molding device for manufacturing a laminated core. A die 1 in this station is rotatable through bearings 2 and 3, and a sprocket 4 is attached to its outer periphery. A link chain (not shown) is hung on the sprocket 4, and this link chain is driven by an indexing means (not shown) to move the sprocket by an angle corresponding to the skew amount with each stroke of the press. 4 (ie, die 1) is rotated.

Reference numeral 5 is a punch (blanking die) for punching out the outer shape provided on the upper mold, 6 is a strip,
7 shows the laminated core pieces punched and stacked in the die 1.

A receiving stand 8 supported by a laminated core receiving cylinder (hydraulic cylinder) 9 is provided within the die 1 . A layer of laminated core pieces 7 pulled out by the punch 5 is placed on the pedestal 8. During press working, a predetermined receiving pressure is applied by the cylinder 9 to prevent the pedestal 8 from lowering due to the weight of the laminated core and the impact of pressurization.
When the laminated core piece in the die 1 is pushed down by the pressurizing force of the punch 5, it will be lowered by that amount. Reference numeral 27 is a rod of the cylinder 9.

A product take-out passage 30 is provided in the lower part of the lower die and extends laterally into a space for inserting a laminated core piece in the die 1. The product extrusion actuator 28 is provided on the opposite side of the passage 30 across the laminated core piece insertion space in the die 1, and is arranged so as to be able to expand and contract its rod 29 in the direction of the passage 30. . Product extrusion actuator 2
As 8, for example, an air cylinder is used. However, the present invention is not limited thereto, and a hydraulic cylinder, electric linear actuator, or the like may also be used.

By the way, in the part of the strip 6 that has reached the die 1 for cutting the outer shape of the iron core piece of the rotor core, there are cut protrusions 31 and slots 32 as shown in FIGS. It is set up at the previous station. Cut and raised protrusion 3
1 consists of an inclined part 31a and a horizontal part 31b, and a round hole 34 is provided at the tip thereof. This round hole 34 is a cut-and-raised projection 3 of the laminated core piece 7 stacked above.
This is an escape hole at the tip of the horizontal portion 31b of 1, which enables skewing. The cut and raised protrusions 31 of the laminated core pieces 7 stacked above are tightly inserted into the voids in the laminated core pieces 7 created by the cut and raised protrusions 31, thereby caulking the stacked laminated core pieces together (tightening). ). For this "crimping", the pressurizing force of the punch 5 and the cylinder 9
and "receiving pressure" via the pedestal 8 act.

Note that the laminated core piece 7' in contact with the pedestal 8 does not have a cut-and-raised protrusion 31, and a hole 33 (see FIG. 3) is formed as the cut-out and raised protrusion 31. For example, if one product laminated core is made up of N core pieces, the cut-and-raise protrusion forming station will not form the cut-and-raise protrusions 31 on the first laminated core piece, but will cut it out. Form the trace hole 33 and from the 2nd sheet to the Nth sheet (N-1)
Cut and raised protrusions 31 are formed on the laminated core pieces. Therefore, a core piece 7' having only a hole 33 without a protrusion 31 is obtained by cutting and raising every N pieces. Cut and raised protrusion 3
The process of removing part 1 to leave only the hole 33 is called a "full cut." In other words, "total cutting" is performed for each number of core pieces that make up one product. All the core pieces 7' that have been cut become the lowest core piece of the product laminated core. In other words, since this core piece 7' does not have the cut-and-raised protrusion 31, it is separated from the core piece 7 without being caulked to the core piece 7 which was previously cut out in the die 1. Therefore, die 1
During the continuous outline cutting and caulking process, each product is automatically separated.

Note that the inner diameter of the die 1 matches the outer diameter of the core piece 7 only at the upper part, and is slightly wider than the outer diameter of the core piece 7 at the lower part. Therefore, the periphery of the laminated core piece drawn into the die 1 is initially in pressure contact with the inner periphery of the die 1, but as the core piece is further pulled out above it, it gradually descends. Eventually die 1
It reaches a position where it does not touch the inner periphery (the wide part of the inner diameter).

Now, in the above-mentioned mold apparatus, when taking out the product, the cylinder 9 is lowered. cylinder 9
The pedestal 8 is lowered by the retraction of the rod 27. At this time, one product located in the wide inner diameter portion of the die 1 and separated by the cut iron core pieces 7' also descends together with the pedestal 8. This cylinder 9 stops when the pedestal 8 descends to a predetermined lower limit position corresponding to the take-out passage 30.

Next, the actuator 28 is expanded and contracted, and the rod 29 pushes out the product on the pedestal 8 into the passage 30.

Subsequently, the cylinder 9 is raised, and when the empty holder 8 from which the product has been removed comes into contact with the lowest part of the product laminated core, the cylinder 9 is stopped from rising. In this way, a series of product removal operations is completed.

Next, an embodiment of the device for detecting the elevated position of a laminated core receiving cylinder according to the present invention will be described with reference to FIG.

In FIG. 4, the rods 27, 2 of the cylinder 9
7' has a hollow cylindrical shape, and a small rod 38 is inserted into the cylinder. The upper end of the small rod 38 is connected to the pedestal 8, and the lower end thereof faces the actuator 36A of the micro switch 36. The micro switch 36 is located on the lower rod 27'
The rod 27' moves up and down as the cylinder 9 expands and contracts. A spring 37 is arranged between the upper end of the upper rod 27 and the pedestal 8. When no load is applied to the pedestal 8, the rod 27 and the pedestal 8 are separated by the repulsive force of the spring 37, as shown in FIG. Do not apply any pressing force to the actuator 36A. Therefore, microswitch 36 is off. When the pedestal 8 comes into contact with the laminated core piece while the cylinder 9 is rising, the spring 37 is compressed and the pedestal 8 is lowered until it touches the upper end of the rod 27. That is, rod 27,
The pedestal 8 and small rod 38 are lowered relative to 27', and the lower end of the small rod 38 presses the actuator 36A of the micro switch 36. This turns on the micro switch 36,
It is detected that an object has come into contact with the pedestal 8.

While the cylinder 9 is rising, the ON signal at the time when the switch 36 is first turned on is used as a rise stop signal to control the rise of the cylinder 9 (not shown), and the rise of the cylinder 9 is stopped.

[Effect of idea]

As explained above, according to the present invention, since the detection is performed in relation to the load applied to the pedestal,
Regardless of the position of the lowest part of the laminated core piece, it is possible to reliably detect the position at which the cylinder in contact with the lowest part should stop rising.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a station from which products are taken out in a progressive die device for manufacturing laminated iron cores to which the present invention is applied; FIG. 2 is a plan view showing an example of a strip portion immediately before outline cutting;
Figure 3 is an enlarged vertical cross-sectional view exaggerating the outline of the laminated core piece, caulking, and skew.
The figure is a configuration diagram showing an embodiment of a rising position detecting device for a laminated core receiving cylinder according to the present invention. 1...Die, 5...Punch, 6...Strip, 7, 7'...Laminated core piece, 8...Scraper, 9
... Cylinder for laminated core receiving, 27 ... Rod,
27'...Lower rod, 36...Micro switch, 37...Spring, 38...Small rod.

Claims (1)

[Claims for Utility Model Registration] A caulking protrusion having a protrusion amount not exceeding the plate thickness of the strip is formed on the strip with each press stroke, and the caulking protrusion is formed on the laminated core piece that is the lowest part of the product laminated core. A station for punching out the portion where the strip is formed, and a punch that is pressed down with each press stroke to pull out the laminated core piece from the strip into the die, and support a cradle that receives the laminated core piece drawn into the die from below. a station that performs caulking with the caulking protrusion using the pressurizing force of the cylinder and the punch;
A progressive mold device for manufacturing a laminated core, comprising a control device that retracts the cylinder, takes out the product on the pedestal that has descended accordingly, and then extends the cylinder until an ascent stop signal is applied. a small rod that is inserted movably in the axial direction into the rod and whose tip is connected to the cradle; a spring disposed between the cradle and the rod of the cylinder; A device for detecting a lifting stop position of a laminated core receiving cylinder, comprising a switch that generates the lifting stop signal in response to relative movement in the axial direction.