JP4968898B2 - Trimming device and scrap blade unit incorporated in this device - Google Patents

Description

  The present invention relates to a trimming device and a scrap blade unit used by being incorporated in the trimming device.

  Conventionally, the periphery of a pressed (drawn) workpiece is trimmed with a trimming blade provided on the upper and lower molds, and at the same time, scraps separated from the workpiece are shredded with a scrap blade provided on the upper and lower molds for post-processing. Various devices have been proposed as trimming devices that facilitate the above.

  For example, as shown in FIG. 7, as a means for simultaneously performing the trimming of the workpiece with the trimming blade and the cutting of the scrap with the scrap blade, the upper portion that cuts the scrap in cooperation with the lower scrap blade 71 of the lower mold as shown in FIG. 7. A scrap blade 72 is provided on the upper die 73, and a concave groove 74 is formed in the lower surface of the upper die 73 along the upper scrap blade 72. The movable trimming blade 75 can be moved up and down in the concave groove 74. There has been proposed a trimming apparatus that is accommodated and has an elastic body 76 disposed between the top surface of the concave groove 74 and the movable trimming blade 75. In this trimming device, the elastic body 76 can be held on the same surface as the upper scrap blade 72 and can be retracted into the concave groove 74 against the urging force by the pressing by the lower scrap blade 71 at all times. The structure is configured to be biased downward (see, for example, Patent Document 1).

Further, as shown in FIG. 8, the movable trimming blade is configured without an elastic body so as to be movable up and down with respect to the upper die 83, one of which faces the lower die scrap blade 81. Of the pair of elevating members 84, 85, and a pair of elevating members 84, 85, and a pair of elevating members 84, 85 slidably abutting on the upper ends of the pair of elevating members 84, 85, There has been proposed a trimming device including a scrap movable cutting blade mechanism composed of a movable cam member 86 that lowers one of the other when it rises (see, for example, Patent Document 2).
JP-A-06-126341 Japanese Utility Model Publication No. 05-5227

  Here, as described in Patent Document 1, when the configuration in which the movable trimming blade 75 is constantly urged downward so as to be retractable into the concave groove 74 by the action of the elastic body 76, the urging force by the elastic body 76 is Of course, it is necessary to be larger than the cutting force (reaction force received from the workpiece) of the upper mold 73 during trimming. Since the elastic body 76 is arranged in a row along the movable trimming blade 75 and its urging direction, the urging force is secured by extending the entire length of the elastic body 76 in order to maintain the urging force. Need arises. For these reasons, the dimension of the upper mold in the thickness direction tends to be large. In this case, it is necessary to process not only the member having the trimming blade but also the upper die main body, and the same processing is required as many times as the number of scrap cutting, resulting in a significant increase in processing time. In particular, in order to cope with the diversification of workpieces, quick and low-cost equipment change is required, but with the above-described configuration, it is difficult to satisfy this requirement satisfactorily.

  For example, according to the configuration described in Patent Document 2, an urging means such as an elastic body is not required, so that the configuration can be simplified, thereby possibly downsizing the apparatus. However, in this configuration, trimming and scrap cutting are performed by strictly setting the positional relationship between the elevating members 84 and 85 and the cam member 86 in the first place. Therefore, in order to make this configuration practically functionable, the elevating members 84 and 85, the cam member 86, and the storage recess 87 for accommodating them must be processed with high accuracy. For example, if the clearance between the cam member 86 and the top bottom surface 88 of the storage recess 87 is larger than a required value, the lower end surfaces of both the elevating members 84 and 85 abut against the workpiece W as shown in FIG. In the state, the gap still remains in the upper part. Therefore, both lifting members 84 and 85 move further upward due to the cutting force at the time of trimming, which may cause the trimming lines to become unaligned. In order to solve the above problems, it is necessary to process each part with high precision, but this is not appropriate because it causes an increase in processing cost.

  In view of the above circumstances, in the present invention, a trimming apparatus capable of reliably cutting scraps with a simple configuration and capable of easily and cost-effectively diversifying workpieces by downsizing. It is another object of the present invention to provide a scrap blade unit used in this apparatus.

In order to solve the above problems, the present invention comprises an upper mold and a lower mold having a corresponding pair of trimming blades and scrap blades, and the upper mold is a recess provided at a position facing the scrap blade of the lower mold; A movable blade part that is held in the recess so as to be relatively movable along the clamping direction and constitutes a part of the upper die trimming blade, and an urging force that urges the movable blade part in the clamping direction with elastic force In the trimming apparatus having the means, the movable blade portion is provided with an inclined surface inclined with respect to the mold clamping direction, and a cam member provided with a cam surface slidably contacting the inclined surface is connected to the urging means. The cam member is configured to be urged in a direction perpendicular to the moving direction of the movable blade portion, a guide hole is formed along the mold clamping direction on the inclined surface, and a through-hole penetrating in the mold clamping direction is formed on the cam surface. In a state where the inclined surface and the cam surface are in contact with each other Providing a trimming apparatus being characterized in that fixed to the front end to the upper mold by inserting the guide bolt id hole and the through-hole.

Moreover, in order to solve the said subject, this invention is the scrap blade unit for trimming apparatuses used by being fixed to an upper mold | type among the upper mold | type and lower mold | die which have a corresponding pair of trimming blades and scrap blades. And a unit body, a recess provided in the unit body at a position facing the scrap blade of the lower mold, and one of the upper trimming blades held in the recess so as to be relatively movable along the clamping direction. A movable blade portion constituting the portion and an urging means for urging the movable blade portion in the mold clamping direction with an elastic force. The movable blade portion is provided with an inclined surface inclined with respect to the mold clamping direction. A cam member provided with a cam surface that slidably contacts the surface is connected to an urging means, and the cam member is urged in a direction orthogonal to the moving direction of the movable blade portion, and the mold clamping direction on the inclined surface Along with a guide hole Forming a through hole penetrating in the clamping direction the cam surface, the inclined surface and a trimming fixed the tip unit body by inserting the guide bolt into the guide hole and the through hole being in contact with the cam surface A scrap blade unit for an apparatus is provided.

  As described above, the present invention provides the cam member for converting the urging direction from the urging means and applying the urging force to the movable blade part between the movable blade part and the urging means. The technical feature is that the cam member is biased in the direction intersecting the moving direction of the movable blade portion. That is, as in the present invention, an urging force is applied to the movable blade portion via the cam surface, and the cam member is urged in a direction crossing the moving direction of the movable blade portion. Even when the urging means is disposed in a direction in which the urging direction intersects the moving direction of the movable blade portion, the movable blade portion can be urged in the mold clamping direction. Therefore, it is possible to reduce the thickness dimension as compared with the conventional case where the elastic bodies are arranged in tandem along the direction of clamping with the movable blade portion, and the above mechanism can be downsized and the upper die can be downsized. (Particularly thinning) is possible. In this case, the stroke of the cam member is larger than that of the movable blade portion, but since the trimming device is intended for thin plate-like workpieces in the first place, in the direction orthogonal to the clamping direction, There is almost no space restriction compared to the direction. Therefore, when the stroke is slightly increased, this kind of trimming apparatus is not adversely affected.

  Further, the urging force applied from the urging means to the cam member is applied to the movable blade portion via the cam member and the cam surface that contacts and slides with the movable blade portion. Here, the balance of force when the cam surface is an inclined surface will be considered. FIG. 6 conceptually shows the balance of forces acting on the cam member 15, and the directions in which the urging force F by the urging means and the force (reaction force from the workpiece) P required to cut the workpiece are orthogonal to each other. It is assumed that the cam member 15 acts on the cam member 15. Here, θ is an angle formed by the inclined surface (cam surface) 21 provided on the cam member 15 with respect to the urging force F. In this case, the balance of force is expressed by the formula F / P = tan θ. From this equation, if the urging force F is P × tan θ or more, trimming can be reliably performed without moving the movable blade portion. Further, from the above balance formula, when the cam surface is the inclined surface 21, if the inclination angle θ is reduced, specifically, if the inclination angle θ is 45 ° or less, the urging force F is smaller than the cutting force P. can do. If the urging force F is small, for example, a small component such as a spring can be used as a component of the urging means. Therefore, the thickness dimension of the upper die can be further reduced by the size reduction of the component. it can.

  Further, if the size can be reduced as described above, it is possible to unitize the movable blade portion and the cam member, and the mechanism including the urging means for urging them. That is, a scrap blade unit including a unit main body, a movable blade portion provided on the unit main body, a cam member, and an urging means, and fixing the scrap blade unit at a predetermined position of the upper die, the scrap blade unit is defined as an upper die. Can be made separately. In addition, since the upper die trimming blade may be changed according to the shape of the workpiece, it is usually manufactured separately from the upper die main body and assembled to the upper die main body to fix it. . Here, since the scrap blade unit according to the present invention does not require any special processing for attaching the unit to the upper die main body, only the side of the member having the upper die trimming blade should be processed for attachment. I'll do it. Therefore, it is possible to cope with the change of the work piece with the minimum necessary change of the mold, thereby further shortening the mold manufacturing period and further reducing the manufacturing cost.

  The crossing angle between the urging direction of the cam member by the urging means and the moving direction of the movable blade portion is preferably 90 ° as shown in FIG. 6, for example. By arranging them so that they are orthogonal to each other, the urging force from the urging means can be applied to the movable blade portion without vainly escaping.

  As described above, according to the present invention, a trimming device that can reliably cut scraps with a simple configuration, and can be easily and inexpensively adapted to diversification of workpieces by downsizing, And the scrap blade unit used for this apparatus can be provided.

  Hereinafter, an embodiment of a trimming apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a main part of a trimming apparatus according to an embodiment of the present invention. As shown in the figure, this trimming apparatus includes an upper mold 1 and a lower mold each having a pair of trimming blades 3 and 4 and scrap blades 5 and 6 (the scrap blade 5 of the upper mold 1 will be described later). 2 is provided.

  The upper die 1 mainly includes an upper die body 7 and a cutting blade member 8 having a trimming blade 3. Among these, a plurality of scrap blade units 11 provided with the scrap blade 5 and the movable blade portion 13 are incorporated in the cutting blade member 8, whereby the scrap blade unit 11 is integrally attached to the upper mold 1. .

  2 and 3 show an exploded perspective view of the scrap blade unit 11 and a sectional view in an assembled state, respectively. As shown in FIG. 2, the scrap blade unit 11 constitutes a unit main body 12 incorporated in the cutting blade member 8 of the upper mold 1, a part of the trimming blade 3 (trimming blade 3 a), and with respect to the unit main body 12. A movable blade part 13 disposed in the unit main body 12 so as to be movable along the mold clamping direction, an urging means 14 for urging the movable blade part 13 in the mold clamping direction with an elastic force, and a movable blade part 13 is mainly provided with a cam member 15 that is in sliding contact with 13 and connected to the urging means 14.

  Specifically, a concave portion 16 is formed at a position of the unit main body 12 facing the scrap blade 6 of the lower mold 2, and the movable blade portion 13 is accommodated in the concave portion 16. In this embodiment, a guide hole 17 is formed in the movable blade portion 13 along the mold clamping direction, a guide bolt 18 is inserted into the guide hole 17, and the tip of the guide blade 17 is fitted to the unit main body 12 with, for example, a screw. The movable blade portion 13 is guided by the outer peripheral surface 18a of the guide bolt 18 and is moved along the mold clamping direction. Further, the guide hole 17 is formed to have a different diameter through a step portion 19, and by engaging the step portion 19 and the head 18 b of the guide bolt 18, the movable blade portion 13 is pulled out when energized. I'm trying to stop.

  An inclined surface 20 having a predetermined inclination angle with respect to the mold clamping direction is provided at the end of the movable blade portion 13 opposite to the trimming blade 3a. The cam member 15 is provided with an inclined surface 21 as a cam surface that slidably contacts the inclined surface 20 of the movable blade portion 13. The cam member 15 is disposed at a predetermined position in the unit main body 12 so as to be urged by the urging means 14 in a direction crossing the moving direction of the movable blade portion 13 with the inclined surfaces 20 and 21 in contact with each other. Has been.

  In this embodiment, the urging means 14 sets the horizontal position of the elastic body 22 in the unit main body 12 of the elastic body 22 by setting an elastic body 22 such as a spring, a plate 23 that presses the elastic body 22, and the plate 23. It comprises a preload adjusting bolt 24 for adjusting the pressing amount (preload). The cam member 15 is provided with a through hole 25 that penetrates the inclined surface 21 in the mold clamping direction. Further, the unit body 12 is formed with a lateral hole 26 that communicates with the recess 16 in the mold clamping direction and accommodates the cam member 15, the elastic body 22, and the plate 23 in a direction perpendicular to the mold clamping direction. . In the illustrated example, the horizontal hole 26 is formed in a shape (both cylindrical here) that follows the outer peripheral shape of the cam member 15, so that the inner peripheral surface 26 a of the horizontal hole 26 guides the cam member 15 during mold clamping. Functions as a surface. Further, by adopting a configuration in which the guide bolt 18 is inserted into the through hole 25, the cam member 15 also acts as a detent.

  In this case, first, the plate 23, the elastic body 22, and the cam member 15 are introduced into the lateral hole 26 in this order. Next, the guide bolt 18 is inserted into the guide hole 17 and the through hole 25 in a state where the inclined surface 20 of the movable blade portion 13 is in contact with the inclined surface 21 of the cam member 15 introduced into the lateral hole 26. The tip is fixed to the unit main body 12. Thereafter, the preload adjusting bolt 24 is screwed into the screw hole 27 provided at the bottom of the horizontal hole 26, and the plate 23 is pushed to a predetermined position in the horizontal direction, so that a required urging force is applied to the movable blade portion 13. The scrap blade unit 11 is completed.

  In this configuration, the moving direction of the movable blade portion 13 and the biasing direction of the cam member 15 are orthogonal as shown in FIG. In addition, when the inclination angle of the inclined surface 21 of the cam member 15 with respect to the urging direction is θ, both inclined surfaces 20 and 21 are formed in this embodiment so that θ ≦ 45 °.

  Further, in the state shown in FIG. 3, the movable blade portion 13 is in a state in which it receives the urging force F from the urging means 14 via the cam member 15 and has moved to a position where it engages with the head 18 b of the guide bolt 18. . At this time, the trimming blade 3 a of the movable blade portion 13 and the trimming blade 3 provided on the unit main body 12 are maintained at the same height. For this height adjustment, for example, the fixing position of the head 18b of the guide bolt 18 with respect to the unit main body 12 and the dimension between the stepped portion 19 of the movable blade 13 that engages with the head 18b and the trimming blade 3a are highly accurate. This can be done by setting. Alternatively, the trimming blade 3, 3 a is unitized in a state in which the machining allowance of the portion is left, and after incorporation into the upper mold 1, the portion corresponding to the trimming blade 3, 3 a is processed by grinding or the like, It is also possible to align the horizontal position and the vertical position of 3a.

  In addition, a scrap blade 5 extends in a direction that is continuous with and perpendicular to the trimming blade 3 at a position facing the scrap blade 6 of the lower mold 2 at the upper end of the inner surface of the recess 16 provided in the unit body 12. ing.

  From the above state, as shown in FIG. 4, the upper mold 1 is brought close to the lower mold 2 and the mold is clamped to trim the workpiece W. In this case, the trimming blade 3 a of the movable blade portion 13 receives a reaction force P from the workpiece W as the workpiece W is cut. Therefore, by adjusting the urging force F and the inclination angle θ so that the urging force F × tan θ acting on the movable blade portion 13 exceeds the reaction force P, the movable blade portion 13 reduces the reaction force P from the workpiece W. The workpiece W can be prevented from being moved upward, and the workpiece W can be reliably cut (trimmed). In particular, in this embodiment, since the urging direction to the cam member 15 by the urging means 14 and the moving direction of the movable blade portion 13 are orthogonal to each other, the urging force F from the urging means 14 is wasted. It can be applied to the movable blade portion 13 without escaping.

  As described above, the workpiece W is trimmed into a predetermined shape by the corresponding pair of trimming blades 3, 4, and then the upper die 1 is brought close to the lower die 2 to correspond to the upper and lower scrap blades 5, 6. The scrap S cut from the workpiece W is cut and separated into a plurality of pieces. FIG. 5 shows the state of the upper mold 1 when the cutting is completed. At this time, the scrap S is cut while sandwiching the scrap S between the lower end surface of the movable blade portion 13 and the upper end surface of the scrap blade member 9 opposed thereto. At this time, as the upper die 1 is lowered, the movable blade portion 13 in contact with the scrap S moves upward (inside the recess 16) against the urging force F × tan θ, so that the die The scrap S can be cut reliably without damaging the steel. In other words, the urging force F and the inclination angle θ are such that the urging force F × tan θ applied to the movable blade portion 13 is larger than the reaction force P received from the workpiece W during trimming and smaller than the clamping force when cutting the scrap S. By adjusting this, the cutting process of the scrap S can be performed without difficulty.

  In this way, the urging means 14 and the cam member are urged by the urging means 14 in a direction crossing the moving direction of the movable blade portion 13 with the inclined surfaces 20 and 21 in contact with each other. By disposing 15 in the unit main body 12, the thickness dimension of the upper mold 1 can be reduced as compared with the conventional case where the movable blade portion and the urging means (elastic body) are arranged in a column. . Furthermore, by reducing the thickness dimension, as in this embodiment, the part related to the scrap blade mechanism can be unitized, which enables versatility, stockability, and ease of manufacture (especially the upper die body). The trimming apparatus excellent in the process (7) can be manufactured at a low cost. Further, since unitization is possible, it is possible to easily and cost-effectively change the workpiece W.

  In this embodiment, since the angle θ formed by the inclined surface 21 of the cam member 15 with respect to the urging force F is set to 45 ° or less, the urging force F can be made smaller than the cutting force P. If the urging force F is small, for example, a small elastic body 22 that constitutes the urging means such as a spring can be used. Therefore, the thickness dimension of the upper die is further reduced by the size reduction of such components. be able to.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Any configuration can be adopted as long as the configuration in which the urging force F is applied to the movable blade portion 13 via the cam member 15 is adopted.

  For example, in the above embodiment, the stepped guide hole 17 is formed in the movable blade portion 13, and the head 18 b of the guide bolt 18 inserted through the guide hole 17 and the stepped portion 19 of the guide hole 17 are engaged. Thus, the retaining of the movable blade portion 13 is configured, but the retaining may be achieved with other configurations. For example, although illustration is omitted, it is possible to prevent the unit main body 12 from being removed by providing a portion (a step or the like) that can be engaged with the movable blade portion 13 in the mold clamping direction. In this case, there is a merit that processing of the guide hole 17 and the through hole 25 becomes unnecessary.

  In the above embodiment, the case where the cam member 15 is provided with the flat inclined surface 21 as the cam surface slidably contacting the movable blade portion 13 is illustrated. As long as the urging force F can be applied to the movable blade portion 13 in the moving direction (clamping direction) when it is urged in a direction crossing the moving direction, a cam surface having an arbitrary shape may be provided. Is possible. Further, the surface shape of the movable blade portion 13 that abuts and slides on the cam surface can also be a shape other than the inclined surface 20 (for example, a convex curved surface shape) as long as the same action occurs.

  In the above embodiment, the urging means 14 is a spring as an elastic body 22 for urging the cam member 15 with an elastic force, and a plate as a means for adjusting the urging force F by pressing the elastic body 22. 23 and the preload adjusting bolt 24 are illustrated as examples, but other configurations may be adopted. For example, the elastic body 22 can be made of a rubber material having relatively high rigidity and small fatigue deterioration due to continuous use. Alternatively, even if the elastic body 22 is not provided, such as a gas spring, an urging force by an elastic force (here, a force generated according to a displacement from the reference position, which is directed toward the reference position). Can be used without any problem as long as the structure is capable of adjusting the biasing force in a specific direction.

  Moreover, in order to improve the versatility of the scrap blade unit 11, the scrap blade 5 can be provided in advance at a position facing the scrap blade 5, that is, at the upper ends of both side surfaces of the recess 16. If it is set as such a structure, the single scrap blade unit 11 can be used also for the scrap cutting location of the opposing side on both sides of the workpiece | work W, and can aim at the reduction of the further manufacturing cost.

  Moreover, although the case where the scrap blade mechanism was unitized as the scrap blade unit 11 was demonstrated in the said embodiment, it is not necessary to restrict to this structure. For example, if there is no problem in processing, the cutting blade member 8 of the upper mold 1 is regarded as the unit main body 12, and the cutting blade member 8 is directly provided with the concave portion 16 and the lateral hole 26 so that the movable blade portion 13 and the biasing means are provided. 14 and the cam member 15 can be accommodated.

It is a principal part perspective view of the trimming apparatus which concerns on one Embodiment of this invention. It is a perspective view of the scrap blade unit integrated in a trimming apparatus. It is sectional drawing of a scrap blade unit. It is sectional drawing of the scrap blade unit periphery at the time of trimming. It is sectional drawing of the scrap blade unit periphery at the time of scrap cutting. It is a figure which shows typically the balance of the force in a cam member. It is a side view which shows the conventional movable scrap blade mechanism. It is sectional drawing which shows the conventional movable scrap blade mechanism.

Explanation of symbols

1 Upper mold 2 Lower mold 3, 4 Trimming blade 3a Trimming blade (movable blade)
5, 6 Scrap blade 11 Scrap blade unit 13 Movable blade portion 14 Energizing means 15 Cam member 16 Recessed portion 21 Inclined surface (cam surface)
22 Elastic body F Energizing force P Cutting force θ Inclination angle

Claims (2)

An upper die and a lower die having a corresponding pair of trimming blades and scrap blades,
The upper die is held in a position facing the scrap blade of the lower die, and is held in the recess so as to be relatively movable along the clamping direction, and constitutes a part of the trimming blade of the upper die In a trimming apparatus having a movable blade portion and an urging means for urging the movable blade portion with an elastic force in a mold clamping direction,
The movable blade portion is provided with an inclined surface that is inclined with respect to the mold clamping direction, a cam member provided with a cam surface that is slidably in contact with the inclined surface is connected to the biasing means, and the cam member is Configured to urge in the direction orthogonal to the moving direction of the movable blade part ,
A guide hole is formed in the inclined surface along the mold clamping direction, and a through-hole penetrating in the mold clamping direction is formed in the cam surface, and the guide hole is in contact with the inclined surface and the cam surface. A trimming apparatus , wherein a guide bolt is inserted into the through hole and the tip is fixed to the upper mold . Among the upper mold and lower mold of the trimming apparatus having a corresponding pair of trimming blades and scrap blades, a scrap blade unit used by being fixed to the upper mold,
A unit main body, a concave portion provided at a position of the unit main body facing the scrap blade of the lower mold, and held in the concave portion so as to be relatively movable along a mold clamping direction; and the trimming blade of the upper mold A movable blade part constituting a part, and an urging means for urging the movable blade part in the mold clamping direction with an elastic force,
The movable blade portion is provided with an inclined surface that is inclined with respect to the mold clamping direction, a cam member provided with a cam surface that is slidably in contact with the inclined surface is connected to the biasing means, and the cam member is Configured to urge in the direction orthogonal to the moving direction of the movable blade part ,
A guide hole is formed in the inclined surface along the mold clamping direction, and a through-hole penetrating in the mold clamping direction is formed in the cam surface, and the guide hole is in contact with the inclined surface and the cam surface. And a scrap blade unit in which a guide bolt is inserted into the through hole and the tip is fixed to the unit body .

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