Progressive press die

Abstract

To provide a progressive press die that can regularly and satisfactorily convey belt-like metal materials to a specific processing stage, regardless of the presence or absence of a lifter member.SOLUTION: A progressive press die comprises a lower mold 1 having a die in which a plurality of die holes Da according to press-processing shapes are formed and an upper mold 2 which is provided with punches P corresponding to the die holes Da respectively and can approach and separate from the lower mold 1, where a plurality of processing stages S are constituted of the corresponding die holes Da and the corresponding punches P and belt-like metal materials W are sequentially conveyed to the processing stages S, so that predetermined press processing is performed by the punches P and the die holes Da in the respective processing stages S. The die further comprises electric magnets 7 which are arranged in a specific stage Sc in at least the upper mold 2, and suction the belt-like metal materials W being conveyed to the specific processing stage Sc by magnetic force.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a progressive press die in which a strip of metal material is sequentially transported to a plurality of processing stages and a predetermined press working is performed by the punches and die holes of each processing stage. [Background technology]

[0002] A conventional progressive press die, as disclosed in Patent Document 1, for example, comprises a lower die having a plurality of dies, each of which has a die hole formed according to the press processing shape, and an upper die which has a punch corresponding to each die hole and which is capable of moving toward and away from the lower die. The corresponding die holes and punches form a plurality of processing stages, and a strip of metal material (a long original sheet of thin metal) is transported sequentially to the processing stages, and the specified press processing is performed by the punches and die holes of each processing stage.

[0003] Furthermore, in a conventional progressive press die, a plurality of lifters are provided on the lower die, and the metal strip is held a predetermined distance above the surface of the die while being transported sequentially through a plurality of processing stages. The lifters are made of members biased upward by a spring, and are configured to be pressed downward against the biasing force of the spring as the upper die descends during press processing, and to rise due to the biasing force of the spring when the upper die rises after press processing, thereby holding the metal strip a predetermined distance above the surface of the die. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-200296 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional technology, for example, when a rotor or stator of a motor is obtained by laminating plate materials punched at a specific processing stage while bonding them together, it is necessary to apply an adhesive or the like to the portions that will become the laminated plate materials in a processing stage prior to the specific processing stage.In this case, if a lifter is provided at the specific processing stage, the adhesive or the like may adhere to the lifter, making it difficult to transport the strip-shaped metal material.

[0006] Furthermore, if a lifter is not provided at a specific processing stage, the strip-shaped metal material being transported to the specific processing stage slides on the surface of the die, and may be caught on, for example, the opening edge of the die hole formed in the die and bent, which may make it difficult to transport the material properly. In particular, at the final processing stage, the rigidity of the strip-shaped metal material is significantly reduced, and the strip-shaped metal material may be caught on, for example, the opening edge of the die hole and bent significantly. Note that, in addition to the application of adhesive, various reasons such as the layout of the die and the material of the strip-shaped metal material may be considered as reasons why a lifter member cannot be provided at a specific processing stage.

[0007] The present invention has been made in consideration of the above circumstances, and its object is to provide a progressive press die that can always transport a strip of metal material to a specific processing stage smoothly, regardless of the presence or absence of a lifter member. [Means for solving the problem]

[0008] The invention described in claim 1 is a progressive press die comprising a lower die having a die in which a plurality of die holes corresponding to a press processing shape are formed, and an upper die having punches corresponding to each of the die holes and capable of moving toward and away from the lower die, a plurality of processing stages being formed by the corresponding die holes and punches, a strip-shaped metal material is sequentially transported to the processing stages, and a predetermined press processing is performed by the punches and the die holes of each of the processing stages, and the progressive press die comprises magnetic attraction means disposed at least in a specific processing stage of the upper die and attracting the strip-shaped metal material transported to the specific processing stage by magnetic force. The specific processing stage laminates a plurality of plate materials punched from the strip-shaped metal material to obtain an integrated laminated part, and the processing stage preceding the specific processing stage applies adhesive to the portions of the plate materials to be laminated in the specific processing stage together with a predetermined press processing. It is characterized by:

[0009] The invention described in claim 2 is characterized in that, in the progressive press die described in claim 1, the magnetic attraction means comprises an electromagnet that generates magnetic force when electrified, and is energized at a predetermined timing to attract the strip-shaped metal material by magnetic force.

[0010] The invention described in claim 3 is characterized in that, in the progressive press die described in claim 2, a press processing process in which the upper die is brought close to the lower die and the strip-shaped metal material is pressed using the die hole and punch in the processing stage, and a transport process in which the upper die is separated from the lower die and the strip-shaped metal material is transported sequentially to the next processing stage are repeatedly carried out, and the magnetic attraction means is energized only during the transport process to attract the strip-shaped metal material transported to the specific processing stage.

[0011] The invention described in claim 4 is a progressive press die according to any one of claims 1 to 3, A guide member is provided which is attached to the die formed in the lower mold, and which positions the strip-shaped metal material moving through the lower mold in the width direction and restricts its upward movement. It is characterized by:

[0012] The invention described in claim 5 is 1In the progressive press die described in the above, the lower die is provided with a lifter member that holds the strip-shaped metal material at a predetermined distance above the surface of the die during the process in which the strip-shaped metal material is sequentially transported through a plurality of processing stages, and the lifter member is provided at the specific processing stage. First, the strip-shaped metal material is held at a predetermined distance above the surface of the die by the magnetic attraction force of the magnetic attraction means instead of the lifter member. It is characterized by:

[0013] The invention recited in claim 6 is characterized in that, in the progressive press die recited in claim 4 or claim 5, the laminated component obtained in the specific processing stage is a rotor or a stator of a motor. Effect of the Invention

[0014] According to the invention described in claim 1, a magnetic suction means is provided which is arranged at least in a specific processing stage of the upper mold and which uses magnetic force to attract the strip-shaped metal material being transported to the specific processing stage, so that the strip-shaped metal material can always be transported smoothly to the specific processing stage regardless of the presence or absence of a lifter member. In addition, the specific processing stage stacks multiple plate materials punched from a strip-shaped metal material to obtain an integrated laminated part, and the processing stage prior to the specific processing stage applies adhesive to the areas that will become the plate materials to be stacked in the specific processing stage together with a specified press processing, so that adjacent plate materials can be bonded with adhesive at the same time as the plate materials are stacked in the specific processing stage.

[0015] According to the invention described in claim 2, the magnetic attraction means comprises an electromagnet which generates magnetic force when electricity is passed through it, and electricity is passed through it at a predetermined timing to attract the strip-shaped metal material with magnetic force. Therefore, magnetic force for attracting the strip-shaped metal material can be generated only when necessary, and it is possible to prevent the lower mold or die from being magnetized more than necessary.

[0016] According to the invention of claim 3, the magnetic suction means is energized only during the transport process to attract the strip-shaped metal material being transported to a specific processing stage, thereby making it possible to prevent the lower mold and die from being magnetized more than necessary, and also to stop the suction of the strip-shaped metal material during the press processing process, thereby enabling precise press processing.

[0018] According to the invention of claim 5, the lower die is provided with a lifter member that holds the strip-shaped metal material at a predetermined distance above the surface of the die while the strip-shaped metal material is being transported sequentially through a plurality of processing stages, and a lifter member is provided at a specific processing stage. First, the strip-shaped metal material is held a predetermined distance above the surface of the die by the magnetic attraction force of the magnetic attraction means instead of the lifter member. Therefore, it is possible to prevent the adhesive from adhering to the lifter member, which would otherwise cause a hindrance to the transport of the strip-shaped metal material.

[0019] According to the invention of claim 6, the laminated component obtained at a specific processing stage is a motor rotor or stator, so that a motor rotor or stator formed by stacking a plurality of plate materials and integrating them with an adhesive can be smoothly obtained. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is an overall side view showing a progressive press die according to an embodiment of the present invention; [Diagram 2] 1A and 1B are a plan view and a side view showing the lower die of the progressive press die; [Diagram 3] FIG. 13 is a perspective view showing the lower die of the progressive press die. [Figure 4] 1A and 1B are a plan view and a side view showing the upper die of the progressive press die; [Diagram 5] FIG. 13 is a perspective view showing the upper die of the progressive press die. [Figure 6] FIG. 13 is a perspective view showing a guide member of the progressive press die. [Figure 7] FIG. 11 is a cross-sectional view showing a lifter member of the progressive press die. [Figure 8] FIG. 13 is a perspective view showing a stator manufactured by the progressive press die. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The progressive press die of this embodiment is a die in which a strip of metal material is transported sequentially to multiple processing stages, and a predetermined press processing is performed using the punches and die holes of each processing stage.As shown in Figures 1 to 5, the progressive press die is configured to include a lower die 1, an upper die 2, a drive unit 8 that repeatedly causes the upper die 2 to rise and fall, and a control unit 9 consisting of a microcomputer or the like that controls the timing of passing electricity through the electromagnet 7 (magnetic attraction means).

[0022] The lower die 1 is fixed to the floor surface, and is configured to have a die D with a plurality of die holes Da formed therein according to the press processing shape, as shown in Figures 2 and 3. A strip-shaped metal material W (coil material) is held in a wound state near the lower die 1, and the strip-shaped metal material W is transported to the lower die 1 by a feeder (not shown). After the strip-shaped metal material W has been subjected to a predetermined press processing by the lower die 1, the scrap material is transported out by the feeder (not shown).

[0023] Furthermore, a plurality of guide members 4 are attached to the die D formed in the lower mold 1, as shown in Figures 2 and 3. A plurality of such guide members 4 are attached along the extending direction of the strip-shaped metal material W, and are capable of positioning the moving strip-shaped metal material W in the width direction. That is, the guide members 4 are attached to the lower mold 1, as shown in Figure 6. 1 The side walls 4a position the material in the width direction, and the upper wall 4b restricts the material from moving upward.

[0024] Furthermore, a plurality of lifter members 5 are attached to the die D formed in the lower die 1, as shown in Figures 2 and 3. A plurality of such lifter members 5 are attached along the extending direction of the strip-shaped metal material W, and as shown in Figure 7, are capable of holding the strip-shaped metal material W a predetermined distance above the surface f of the die D during the process in which the strip-shaped metal material W is transported sequentially across a plurality of processing stages S.

[0025] Specifically, the lifter member 5 is biased upward by a biasing member 6 made of a coil spring, and during press processing, as the upper die 2 descends, it is pressed downward against the biasing force of the biasing member 6, and when the upper die 2 rises after press processing, it rises to the position shown in Fig. 7 by the biasing force of the biasing member 6 and holds the strip-shaped metal material W a predetermined distance above the surface f of the die D. The strip-shaped metal material W moves by sliding on the tip face of the lifter member 5 during the process of being sequentially transported.

[0026] The upper die 2 is disposed above the lower die 1, and as shown in Figures 4 and 5, is provided with a punch P corresponding to each die hole Da, and can be moved toward or away from the lower die 1 by driving a drive unit 8. That is, when the upper die descends and approaches the lower die 1, each punch P is inserted into the corresponding die hole Da, and the strip-shaped metal material W at that portion is pressed (punched in this embodiment).

[0027] In addition, a stripper 3 that covers and protects the punch P is attached to the surface of the upper die 2 facing the lower die 1, and when the upper die 2 approaches the lower die 1 by driving the drive unit 8, the punch P protrudes from the stripper 3 and can be inserted into the die hole Da.

[0028] Thus, in the progressive press die according to this embodiment, a plurality of processing stages S are formed with corresponding die holes Da and punches P, and the strip-shaped metal material W is sequentially transported to the processing stages S, and a predetermined press processing (punching) is performed by the punch P and die hole Da of each processing stage S. In other words, each time the upper die 2 approaches the lower die 1, the strip-shaped metal material W is simultaneously subjected to a predetermined press processing in the plurality of processing stages S formed by the lower die 1 and the upper die 2.

[0029] In this embodiment, the final stage among the multiple processing stages S constituted by the lower mold 1 and the upper mold 2 is designated as a specific processing stage Sc, and the processing stage immediately preceding it is designated as processing stage Sd.

[0030] The specific processing stage Sc stacks multiple plate materials punched from a strip-shaped metal material W to obtain an integrated laminated part, and the processing stage preceding the specific processing stage Sc (in this embodiment, the processing stage Sd immediately preceding it) is configured to apply adhesive to the areas that will become the plate materials to be stacked at the specific processing stage Sc together with a specified press processing.

[0031] That is, in the processing stage Sd, a predetermined press processing is performed and an adhesive is applied, and then the portion to which the adhesive is applied is punched in a specific processing stage Sc to obtain a plate material of a predetermined shape, and a laminated component integrated with the adhesive can be obtained by stacking the multiple plate materials thus obtained. In this embodiment, the laminated component obtained in the specific processing stage Sc is a motor stator B (a laminated stator) as shown in FIG. 8.

[0032] Here, the progressive press die according to this embodiment is provided with an electromagnet 7 as a magnetic attraction means that is disposed at least in a specific processing stage Sc in the upper die 2 and attracts, by magnetic force, the strip-shaped metal material W transported to the specific processing stage Sc. As shown in Figs. 4 and 5, the electromagnet 7 is disposed in the upper die 2 (specifically, the stripper 3 attached to the upper die 2) and generates magnetic force when energized, and a plurality of electromagnets 7 (four in the circumferential direction in this embodiment) are attached around the punch P of the specific processing stage Sc.

[0033] Moreover, the electromagnet 7 is electrically connected to the control unit 9 and can be energized at a predetermined timing synchronized with the drive of the drive unit 8. Specifically, the progressive press die according to this embodiment repeatedly executes a press working process in which the upper die 2 is brought close to the lower die 1 by drive by the drive unit 8 and a press working is performed on a strip-shaped metal material W with a die hole Da and a punch P in the processing stage S, and a transport process in which the upper die 2 is moved away from the lower die 1 by drive by the drive unit 8 and the strip-shaped metal material W is transported sequentially to the next processing stage S, and the electromagnet 7 is energized only during the transport process to attract the strip-shaped metal material W transported to a specific processing stage Sc.

[0034] Furthermore, in the progressive press die according to this embodiment, the specific processing stage Sc is not provided with a lifter member 5. That is, the strip-shaped metal material W slides on the lifter member 5 while being held a predetermined distance above the surface f of the die D and is transported sequentially in the process of moving through the processing stages S other than the specific processing stage Sc, and at the specific processing stage Sc, which is the final processing stage, it is attracted upward by the magnetic force generated by the electromagnet 7, so that even without the lifter member 5, it is transported while being held a predetermined distance above the surface f of the die D.

[0035] Therefore, the process of conveying the strip-shaped metal material W coated with adhesive in the processing stage Sd to a specific processing stage Sc, and the process of conveying the strip-shaped metal material W to a specific processing stage Sc are performed in the same manner as in the process of conveying the strip-shaped metal material W to a specific processing stage Sd. processing During the process of a specified press processing (punching processing) being performed on the stage Sc, the die D can be held at a position above the surface f by the magnetic attraction force of the electromagnet 7 instead of the lifter member 5, thereby preventing adhesive from adhering to the lifter member 5.

[0036] According to this embodiment, the electromagnet 7 is provided as a magnetic attraction means that is disposed at least in the specific processing stage Sc in the upper mold 2 and attracts the strip-shaped metal material W transported to the specific processing stage Sc by magnetic force, so that the strip-shaped metal material W can always be transported well to the specific processing stage Sc regardless of the presence or absence of the lifter member 5. In particular, since the specific processing stage Sc is the final processing stage, the rigidity of the strip-shaped metal material W is the lowest and it would be easily bent without the lifter member 5, so that the magnetic force of the electromagnet 7 is generated at the specific processing stage Sc to attract it upward, thereby allowing the strip-shaped metal material W to be transported effectively and reliably.

[0037] Moreover, the magnetic attraction means according to this embodiment is composed of an electromagnet 7 which generates a magnetic force when energized, and is energized at a predetermined timing to attract the strip-shaped metal material W with a magnetic force, so that the magnetic force for attracting the strip-shaped metal material W can be generated only when necessary, and it is possible to prevent the lower mold 1 and the die D from being magnetized more than necessary. In particular, the magnetic attraction means according to this embodiment is energized only during the transport step to attract the strip-shaped metal material W transported to a specific processing stage Sc, so that it is possible to prevent the lower mold 1 and the die D from being magnetized more than necessary, and it is also possible to stop the attraction of the strip-shaped metal material W during the press processing step to perform press processing with high accuracy.

[0038] Furthermore, the specific processing stage Sc stacks multiple plate materials punched from a strip-shaped metal material W to obtain an integrated laminated part, and the processing stage Sd preceding the specific processing stage Sc (immediately preceding in this embodiment) applies adhesive to the areas that will become the plate materials to be laminated in the specific processing stage Sc in addition to a specified press processing, so that adjacent plate materials can be bonded with adhesive at the same time as the plate materials are stacked in the specific processing stage Sc.

[0039] Furthermore, the lower die 1 is provided with a lifter member 5 that holds the strip-shaped metal material W a predetermined distance above the surface f of the die D during the process of the strip-shaped metal material W being transported sequentially through multiple processing stages S, and since the lifter member 5 is not provided on a specific processing stage Sc, it is possible to prevent adhesive from adhering to the lifter member 5 and causing interference with the transportation of the strip-shaped metal material W.

[0040] Furthermore, since the laminated component obtained at the specific processing stage Sc is the stator B of the motor, the stator B of the motor can be smoothly obtained by stacking a plurality of plate materials and integrating them with an adhesive. The laminated component obtained at the specific processing stage may be the rotor of the motor, in which case the rotor of the motor can be smoothly obtained by stacking a plurality of plate materials and integrating them with an adhesive. The laminated component obtained at the specific processing stage Sc may be another laminated component, and may be one that is premised on integration by adhesive, or integration by crimping or the like.

[0041] Furthermore, in the progressive press die of this embodiment, the stator B of the motor is sequentially obtained, but the progressive press die for obtaining the rotor of the motor and the progressive press die for obtaining the stator B may be arranged in series, or the progressive press die for obtaining the rotor and the progressive press die for obtaining the stator B may be arranged in parallel.

[0042] Although the present embodiment has been described above, the present invention is not limited to this, and for example, the magnetic attraction means may be a permanent magnet instead of the electromagnet 7. Also, the magnetic attraction means according to the present embodiment is energized only during the transport step to attract the strip-shaped metal material W transported to a specific processing stage Sc, but it may be energized during both the press processing step and the transport step.

[0043] Furthermore, in this embodiment, the magnetic attraction means is disposed only in the specific processing stage Sc of the upper die 2, but may be disposed in other processing stages in addition to the specific processing stage Sc. Note that in this embodiment, the lifter member 5 is not disposed in the specific processing stage Sc but is disposed in other locations, but the lifter member 5 may not be disposed in other locations either, and may be disposed not only in the edge portion of the metal material W but also in the vicinity of the center portion of the metal material W. In addition, in this embodiment, the punches P and die holes Da are disposed in one row in the conveying direction of the metal material W, but the punches P and die holes Da may be disposed in two or more rows in the conveying direction of the metal material W so that multiple products can be punched simultaneously. [Industrial Applicability]

[0044] As long as it is a progressive press die that is at least arranged in a specific processing stage of the upper die and is equipped with a magnetic suction means that magnetically attracts the strip-shaped metal material transported to that specific processing stage, it can be applied to die sets with different external shapes or those with added functions. [Explanation of symbols]

[0045] 1 Lower mold 2 Upper mold 3 Stripper 4 Guide member 5 Lifter member 6. Pressing member (coil spring) 7 Electromagnet (magnetic attraction means) 8 Drive unit 9. Control Unit D-die Da Die hole S Processing stage B. Stator

Claims

1. A lower mold having a die in which a plurality of die holes corresponding to a press processing shape are formed; an upper die having punches corresponding to the die holes and movable toward and away from the lower die; a plurality of processing stages are formed by the corresponding die holes and the punches, a strip-shaped metal material is sequentially conveyed to the processing stages, and a predetermined press processing is performed by the punches and the die holes of each of the processing stages, A progressive press die comprising: a magnetic suction means that is disposed at least in a specific processing stage of the upper die and that magnetically attracts the strip-shaped metal material being transported to the specific processing stage; the specific processing stage stacks a plurality of plate materials punched from the strip-shaped metal material to obtain an integrated laminated part; and a processing stage preceding the specific processing stage applies an adhesive to the areas that will become the plate materials to be stacked at the specific processing stage together with a specified press processing.

2. 2. The progressive press die according to claim 1, wherein the magnetic attraction means comprises an electromagnet which generates a magnetic force when energized, and is energized at a predetermined timing to attract the strip-shaped metal material by magnetic force.

3. a pressing process in which the upper die is brought close to the lower die and the band-shaped metal material is pressed by the die hole and the punch in the processing stage; a conveying step of separating the upper die from the lower die and conveying the strip-shaped metal material to a next processing stage; 3. The progressive press die according to claim 2, wherein the steps are repeatedly executed, and the magnetic attraction means is energized only during the transport step to attract the strip-shaped metal material transported to the specific processing stage.

4. A progressive press die as described in any one of claims 1 to 3, characterized in that it is equipped with a guide member attached to the die formed on the lower die, which positions the strip-shaped metal material moving through the lower die in the width direction and regulates its upward movement.

5. The progressive press die of claim 1, characterized in that the lower die is provided with a lifter member that holds the strip-shaped metal material a predetermined distance above the surface of the die while the strip-shaped metal material is sequentially transported through a plurality of processing stages, and the lifter member is not provided at the specific processing stage, and instead of the lifter member, the magnetic suction force of the magnetic suction means holds the strip-shaped metal material a predetermined distance above the surface of the die.

6. 6. The progressive press die according to claim 4, wherein the laminated part obtained at the specific processing stage is a rotor or a stator of a motor.

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