Processing equipment

Abstract

To provide a processing device that can suppress snagging of sheet metal. [Solution] The processing apparatus according to the present disclosure is a processing apparatus that presses a sequentially fed sheet material using an upper die and a lower die equipped with a punch and a stripper, and includes a pressing member installed in the upper die that presses down on the sheet material when the stripper rises and has a contact surface that contacts the sheet material and is rotatable in the direction of the sheet material's movement.

Description

Technical Field

[0001] This disclosure relates to a processing device.

Background Art

[0002] In recent years, in a processing device that feeds a plate material (workpiece) forward and presses it, a technique for suppressing the wobbling of the plate material during forward feeding has been disclosed. For example, the press processing device disclosed in Patent Document 1 has a pressing member on the upper die of the device. The pressing member presses the electromagnetic steel sheet from above until the electromagnetic steel sheet is lifted to a predetermined upper position by a lifter or the like. Thereby, when the electromagnetic steel sheet is lifted to a predetermined upper position, it is possible to suppress the electromagnetic steel sheet from wobbling upward due to the inertial force generated in the upward direction of the electromagnetic steel sheet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the pressing member of Patent Document 1, the pin portion, that is, the tip portion that contacts the electromagnetic steel sheet, has a rectangular shape. Therefore, when the pressing member is separated from the upper surface of the electromagnetic steel sheet and the electromagnetic steel sheet is fed forward, if vertical displacement or vibration occurs in the electromagnetic steel sheet and the electromagnetic steel sheet and the pressing member interfere with each other, the electromagnetic steel sheet may be caught by the pressing member.

[0005] This disclosure has been made to solve such problems, and an object thereof is to provide a processing device capable of suppressing the catching of a plate material.

Means for Solving the Problems

[0006] The processing apparatus according to this disclosure is a processing apparatus for press-working a sequentially fed sheet material using an upper die and a lower die equipped with a punch and a stripper, and includes a pressing member installed on the upper die that presses down on the sheet material when the stripper rises, and whose contact surface that abuts against the sheet material is rotatable in the direction of the sheet material's movement. As a result, even if fluttering occurs in the sheet material and the contact surface of the pressing member interferes with the sheet material, the rotation of the contact surface of the pressing member suppresses the generation of frictional force from the contact surface to the sheet material. Consequently, the occurrence of the sheet material getting stuck during the process of conveying the sheet material can be suppressed. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a processing apparatus that can suppress snagging of sheet materials. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram of the press working apparatus 1 according to this disclosure. [Figure 2] Figure 2 is a schematic diagram of the press working apparatus 1 according to this disclosure. [Figure 3] Figure 3 is a schematic diagram of a press working apparatus that does not include a pressing member 33 in its configuration. [Figure 4] Figure 4 is a schematic diagram relating to the upward movement of the plate material. [Figure 5] Figure 5 is a schematic diagram of the movement of the plate material. [Figure 6] Figure 6 is a schematic diagram of the press working apparatus 1a according to this disclosure. [Modes for carrying out the invention]

[0009] (Embodiment 1) Embodiment 1 of the present disclosure will be described below with reference to the drawings. Figure 1 is a schematic diagram of a press working apparatus 1 according to the present disclosure. The press working apparatus 1 performs a punching process, which is a type of press working, on a sheet material WW. The sheet material WW is a strip-shaped thin sheet material made of metal such as steel or aluminum. The sheet material WW may be, for example, an electrical steel sheet.

[0010] In this disclosure, the press working apparatus 1 performs progressive press working on a sheet material WW. Progressive press working is a processing method in which multiple processes are arranged in a predetermined direction at predetermined intervals on a single progressive die. Here, the progressive press working according to this disclosure may be double-row or single-row. That is, the progressive die according to this disclosure may or may not be formed to perform punching in multiple rows simultaneously. The press working apparatus 1 may also perform single-stroke press working.

[0011] Upstream of the press working apparatus 1, an uncoiler, a leveler, and a feeder (none of which are shown) may be arranged. The uncoiler holds the rolled sheet material WW in a pullable manner. The uncoiler has the function of unwinding the sheet material WW by rotating it when it is fed to the press working apparatus 1. The leveler is located downstream of the uncoiler. The leveler has a pair of straightening rollers and corrects the deflection that occurs in the sheet material WW unwound from the uncoiler. The feeder is located further downstream of the leveler. The feeder has a pair of feed rollers and, by the rotation of these rollers, conveys the sheet material WW straightened by the leveler to the press working apparatus 1.

[0012] The press working apparatus 1 comprises a lower die 2 and an upper die 3. The lower die 2 and upper die 3 are formed such that multiple processes are arranged in a predetermined direction at predetermined intervals. The lower die 2 and upper die 3 are a pair of dies that punch out sheet metal WW by applying pressure to it. Here, the lower die 2 and upper die 3 together are also referred to as progressive dies.

[0013] The lower die 2 and the upper die 3 may or may not be positioned opposite each other in the vertical direction. That is, the lower die 2 and the upper die 3 may or may not be positioned so that the sheet metal WW is conveyed and pressed in the horizontal direction. Hereafter, the lower die 2 and the upper die 3 will be assumed to be positioned opposite each other in the vertical direction. Also, hereafter, the direction in which the sheet metal WW is conveyed will be referred to as the forward direction. The forward direction of the sheet metal WW will also be referred to as the direction of travel of the sheet metal WW. In Figure 1, the lower die 2 and the upper die 3 are positioned opposite each other in the Z-axis direction (vertical direction), and the sheet metal WW is conveyed in the positive X-axis direction (horizontal direction) by, for example, a feed device. That is, in Figure 1, the forward direction of the sheet metal WW is the positive X-axis direction.

[0014] The lower die 2 is a fixed die located below the sheet metal WW flowing through the press working apparatus 1. On the other hand, the upper die 3 is a movable die located above the sheet metal WW flowing through the press working apparatus 1. The upper die 3 can move, for example, in the vertical direction. That is, the upper die 3 can be lowered to approach the lower die 2, and raised away from the lower die 2. This movement of the upper die 3 can be achieved by a press machine (not shown).

[0015] The lower die 2 comprises a die 21 and a lifter 22. The die 21 comprises a die hole 211 and a holding portion 212. As the upper die 3 descends to its bottom dead center, the die 21 is formed such that a portion of its upper surface and the lower surface of the upper die 3 clamp the plate material WW. The upper surface of the die 21 other than the die hole 211 and the holding portion 212 typically forms a horizontal plane. In Figure 1, the upper surface of the die 21 other than the die hole 211 and the holding portion 212 forms an XY plane (horizontal plane).

[0016] The die hole 211 is part of the processing area when punching out the sheet metal WW. The die hole 211 may be a through hole or a non-through hole for the die 21 that punches out the sheet metal WW in a shape that follows the contour of the upper die 3. The horizontal cross-section of the die hole 211 has a predetermined shape, such as a circle or a polygon. The central axis of the die hole 211 extends in the vertical direction. The metal pieces punched out from the sheet metal WW may be discharged to the outside via the die hole 211. These metal pieces may be products manufactured by the punching process or scrap. The members punched out from the sheet metal WW are called punched sheet metal WO. In Figure 1, punched sheet metal WO is accumulated in the die hole 211.

[0017] The holding portion 212 has a space for holding the lifter 22. The holding portion 212 has a space such that when the lifter 22 is lowered to its lowest point, the upper end of the lifter 22 and the upper surface of the die 21 are substantially flush. The shape of the holding portion 212 is typically concave, but it may also have a shape that matches the shape of the lifter 22. In Figure 1, the holding portion 212 has a concave shape. In addition, there may be multiple holding portions 212 arranged in the progressive direction of the sheet material WW, or only one may be arranged throughout the process of the press working apparatus 1. When there are multiple holding portions 212, they may be arranged, for example, at regular intervals in the progressive direction of the sheet material WW, or they may not be arranged at regular intervals. That is, the holding portions 212 may be arranged at random intervals.

[0018] The lifter 22 is a device for separating and supporting the plate material WW punched by the lower die 2 and the upper die 3 from the lower die 2. The lifter 22 is disposed within the holding portion 212 and is movable vertically within the holding portion 212. For example, when the lifter 22 separates the plate material WW from the lower die 2, it rises in conjunction with the rising upper die 3. At this time, the upper end portion of the lifter 22 pushes up the plate material WW to separate the plate material WW from the lower die 2. When the lifter 22 is at the highest rising position, the upper end portion of the lifter 22 is in contact with the plate material WW. Also, when the lifter 22 is at the lowest descending position, the upper end portion of the lifter 22 and the upper surface of the die 21 are substantially flush. A plurality of lifters 22 may be arranged in the forward feeding direction of the plate material WW, or only one may be arranged throughout the processes of the press working apparatus 1. When a plurality of lifters 22 are arranged, the lifters 22 may be arranged at regular intervals, for example, in the forward feeding direction of the plate material WW, or may not be arranged at regular intervals. That is, the lifters 22 may be arranged at random intervals.

[0019] The lifter 22 includes a contact portion 221 and a connecting portion 222. The upper surface of the contact portion 221 contacts the lower surface of the plate material WW when the plate material WW is punched or when the plate material WW is fed forward. That is, the contact portion 221 is the contact surface of the lifter 22 that contacts the plate material WW.

[0020] The contact portion 221 is rotatable in the conveyance direction of the plate material WW. That is, when the contact portion 221 contacts the plate material WW when the plate material WW is fed forward, the contact portion 221 can rotate in the same direction as the conveyance direction of the plate material WW. Here, the rotation of the contact portion 221 means that at least the portion of the contact portion 221 that contacts the plate material WW rotates about an axis.

[0021] The contact portion 221 may or may not rotate at the same speed as the conveying speed (traveling speed) of the plate material WW. In other words, when the contact portion 221 and the plate material WW are in contact, the contact portion 221 may rotate such that there is no substantial speed difference between the rotational speed of the contact portion 221 and the conveying speed of the plate material WW, or it may rotate in a state where there is a substantial speed difference between the conveying speed of the plate material WW and the contact portion 221. To put it another way, while the contact portion 221 and the plate material WW are in contact, the plate material WW and the contact portion 221 may rotate such that the same contact surface remains in contact, or it may not. To put it another way, while the contact portion 221 and the plate material WW are in contact, the plate material WW may slide against the contact portion 221.

[0022] The contact surface between the contact portion 221 and the plate material WW may be a point, a line, or a surface. That is, the contact portion 221 may be cylindrical or spherical. Here, the contact portion 221 may be rotatable by providing a rotating base such as a bearing or gimbal. If the contact portion 221 is cylindrical, it may specifically be a roller. If the contact portion 221 is a roller, it may consist of one roller or multiple rollers. Also, the contact portion 221 may use a pulley as a rotating body, cover the pulley with a belt, and be configured so that the belt is in contact with the plate material WW. In Figure 1, the contact portion 221 is a roller.

[0023] When the contact portion 221 is viewed from the width direction of the plate material WW, the contact portion 221 may be circular, elliptical, triangular, square, or any other shape. Here, the width direction of the plate material WW may or may not be perpendicular to the forward direction of the plate material WW. In other words, the width direction of the plate material WW is any direction on the plate material WW such that its direction intersects with the forward direction of the plate material WW.

[0024] Specifically, the contact portion 221 may be formed in an arc shape in the direction opposite to the forward feeding direction of the plate material WW, or at a right angle, or it may be tapered with an inclination in the opposite direction with respect to the vertical. Furthermore, the contact portion 221 may be formed in an arc shape in both the forward feeding direction and the opposite direction of the plate material WW, or at a right angle, or it may be tapered. In Figure 1, the shape of the contact portion 221 when viewed from the width direction (positive Y-axis direction) of the plate material WW is arc-shaped.

[0025] The contact portion 221 may be rotatable by the frictional force generated by contact with the plate material WW, or it may be rotatable by another drive mechanism. Specifically, the contact portion 221 may or may not have a drive mechanism such as a motor (not shown).

[0026] The connecting portion 222 is a drive source that raises and lowers the contact portion 221 within the holding portion 212. The connecting portion 222 is formed from, for example, a spring, cylinder, urethane, rubber, etc. One end of the connecting portion 222 is in contact with or joined to the lower surface of the contact portion 221, and the other end is in contact with or joined to any surface on the inner surface of the holding portion 212. Preferably, the connecting portion 222 has an upward force sufficient to push up and support the punched sheet metal WW. In Figure 1, the connecting portion 222 is formed from a spring. Also in Figure 1, one end of the connecting portion 222 is joined to the lower surface of the contact portion 221, and the other end is joined to the lower surface inside the holding portion 212.

[0027] The upper die 3 comprises a stripper 31, a punch 32, and a pressing member 33. The stripper 31 descends in two directions on the lower die during punching. The lower surface of the descended stripper 31 and the die 21 grip the sheet metal WW as the punch 32 rises after punching. In this way, the stripper 31 removes the sheet metal WW that has become stuck to the rising punch 32 from the punch 32. The stripper 31 is typically a substantially rectangular sheet metal member. The stripper 31 may achieve its upward and downward movement by being connected to a punch holder (not shown) that holds the punch 32 via an elastic body (not shown) on its upper surface.

[0028] The stripper 31 includes a punch hole 311 and a holding portion 312. The punch hole 311 is part of the processing portion when punching out the sheet material WW. Specifically, the punch hole 311 is a through hole of the stripper 31 provided in the corresponding punch 32. The punch hole 311 has a shape corresponding to the punch 32 through which it is inserted, and its central axis extends in the vertical direction. The punch hole 311 is positioned perpendicularly opposite the die hole 211.

[0029] The holding portion 312 has a space for holding the pressing member 33. The holding portion 312 has a space such that when the pressing member 33 is retracted to its uppermost position, the lower end of the pressing member 33 and the lower surface of the die 21 are substantially flush. The shape of the holding portion 312 is typically concave, but it may also have a shape that matches the shape of the pressing member 33. In Figure 1, the holding portion 312 has a concave shape. In addition, there may be multiple holding portions 312 arranged in the progressive direction of the sheet material WW, or only one may be arranged throughout the process of the press working apparatus 1. When multiple holding portions 312 are arranged, they may be arranged, for example, at regular intervals in the progressive direction of the sheet material WW.

[0030] The punch 32 is part of the processing unit used when punching out sheet metal WW. The punch 32 is positioned perpendicular to the die hole 211. Typically, the punch 32 is a column with an arbitrary horizontal cross-section. That is, the punch 32 punches out sheet metal WW in the shape of the contour of its horizontal cross-section, producing punched sheet metal WO. The punch 32 is formed to be slightly smaller in dimensions than the die hole 211. This ensures that when the punch 32 is inserted into the die hole 211, a certain clearance is maintained between the punch 32 and the die hole 211.

[0031] The upper surface of the punch 32 may be held by a punch holder. The upper surface of the punch holder may also be joined to the press machine. The punch 32 may achieve its vertical movement through the vertical movement of the punch holder accompanying the vertical movement of the press machine.

[0032] The pressing member 33 is a device for pressing the sheet material WW from above. The pressing member 33 presses down on the sheet material WW after punching, when the lifter 22 and stripper 31 are raised. It may also press down on the sheet material WW when it is being transported (moving), or when the stripper 31 is descending. In other words, the pressing member 33 is in contact with the sheet material WW when the lifter 22 and stripper 31 are raised. The pressing member 33 may also be in contact with the sheet material WW when it is being transported, or when the stripper 31 is descending.

[0033] The pressing member 33 is positioned within the holding portion 312 and is movable vertically within the holding portion 312. In other words, the pressing member 33 is expandable and contractible vertically. During punching, when the stripper 31 and die 21 grip the sheet material WW, that is, when the pressing member 33 is most contracted, the lower end of the pressing member 33 and the stripper 31 are approximately flush. Multiple pressing members 33 may be positioned in the forward direction of the sheet material WW, or only one may be positioned throughout the process of the press working apparatus 1. When multiple pressing members 33 are positioned, they may be positioned, for example, at regular intervals in the forward direction of the sheet material WW.

[0034] The pressing member 33 and the lifter 22 may or may not be positioned opposite each other in the vertical direction. In other words, the pressing member 33 may or may not be positioned directly above the lifter 22. That is, the pressing member 33 may be positioned above the position where the lifter 22 is not present, or it may be positioned offset from the lifter 22. In Figure 1, the pressing member 33 on the right and the lifter 22 are positioned opposite each other in the vertical direction, but the pressing member 33 on the left is not positioned directly above the lifter 22, but offset from the lifter 22. An example of the positional relationship between the pressing member 33 and the lifter 22 is shown in another drawing. Figure 2 is a schematic diagram of the press working apparatus 1 according to this disclosure. In Figure 2, the pressing member 33 on the right is positioned above the position where the lifter 22 is not present.

[0035] The pressing member 33 comprises a contact portion 331 and a connecting portion 332. The contact portion 331 is the contact surface of the pressing member 33 that abuts against the sheet metal WW. The contact portion 331 is rotatable in the conveying direction of the sheet metal WW. That is, when the sheet metal WW comes into contact with the contact portion 331 as it is being fed forward, the contact portion 331 can rotate in the same direction as the conveying direction of the sheet metal WW. Here, rotation of the contact portion 331 means that it rotates around an axis in which at least the portion of the contact portion 331 that abuts against the sheet metal WW is located.

[0036] The contact portion 331 may or may not rotate at the same speed as the conveying speed (moving speed) of the plate material WW. In other words, when the contact portion 331 and the plate material WW are in contact, the contact portion 331 may rotate such that there is no substantial speed difference between the rotational speed of the contact portion 331 and the conveying speed of the plate material WW, or it may rotate in a state where there is a substantial speed difference between the conveying speed of the plate material WW and the contact portion 331. To put it another way, while the contact portion 331 and the plate material WW are in contact, the contact portion 331 and the plate material WW may rotate such that the same contact surface remains in contact, or it may not. To put it another way, while the contact portion 331 and the plate material WW are in contact, the plate material WW may slide against the contact portion 331.

[0037] The contact surface between the contact portion 331 and the plate material WW may be a point, a line, or a surface. That is, the contact portion 331 may be cylindrical or spherical. Here, the contact portion 331 may be rotatable by providing a rotating base such as a bearing or gimbal. If the contact portion 331 is cylindrical, it may specifically be a roller. If the contact portion 331 is a roller, it may consist of one roller or multiple rollers. Furthermore, the contact portion 331 may use a pulley as a rotating body, cover the pulley with a belt, and be configured so that the belt is in contact with the plate material WW. In Figure 1, the contact portion 331 is a roller.

[0038] When the contact portion 331 is viewed from the width direction of the plate material WW, the contact portion 331 may be circular, elliptical, triangular, square, or any other shape. Specifically, the contact portion 331 may be formed in an arc shape in the direction opposite to the forward direction of the plate material WW, at a right angle, or tapered with respect to the vertical direction. In Figure 1, the shape of the contact portion 331 when viewed from the width direction (positive Y-axis direction) of the plate material WW is an arc shape.

[0039] The contact portion 331 may be rotatable by the frictional force generated by contact with the plate material WW, or it may be rotatable by another drive mechanism. Specifically, the contact portion 331 may be rotatable by a motor (not shown).

[0040] The connecting portion 332 is the connection point between the contact portion 331 and the holding portion 312 within the holding portion 312. The connecting portion 332 is formed from, for example, a spring, cylinder, urethane, rubber, or string. One end of the connecting portion 332 abuts against or is joined to the lower surface of the contact portion 331, and the other end abuts against or is joined to any surface on the inner surface of the holding portion 312. The connecting portion 332 may be an elastic body and may have a Young's modulus sufficient to press down on the punched sheet metal WW. If the contact portion 331 can press down on the sheet metal WW due to gravity, the connecting portion 332 does not have to be an elastic body. In Figure 1, the connecting portion 332 is formed from a spring. Also in Figure 1, one end of the connecting portion 332 is joined to the lower surface of the contact portion 331, and the other end is joined to the lower surface inside the holding portion 312.

[0041] The press working apparatus 1 may also be equipped with side guides (not shown) as other components. The side guides are designed to suppress misalignment during the transport of the sheet material WW by the feed device. The side guides are provided on the widthwise edge of the sheet material WW. The side guides may be provided on one edge or on both edges. In addition, multiple side guides may be provided at regular intervals in the forward feeding direction of the sheet material WW. To suppress vertical vibration and widthwise misalignment, the side guides typically have an inverted L-shape and are joined to the lower die 2. Under normal conditions, the side guides may be in close proximity to or in contact with the transported sheet material WW.

[0042] Here, the effect of the pressing member 33 will be explained. The pressing member 33 can suppress the upward movement of the sheet metal WW in the direction of the upper die 3 due to the upward airflow generated from the lower die 2 to the upper die 3. The phenomenon of the sheet metal WW rising in the direction of the upper die 3 is as follows: When the punch 32 punches out the sheet metal WW while the lower surface of the stripper 31 and the upper surface of the die 21 are gripping the sheet metal WW, the punch 32 then rises. At that time, the stripper 31 removes the sheet metal WW that has bitten into the punch 32. After that, the stripper 31 rises with a delay compared to the punch 32. The lifter 22 rises in conjunction with the stripper 31. The sheet metal WW is pushed up by the lifter 22 and rises, and is released from the die 21. Even during this process, the stripper 31 and punch 32 continue to rise. The space created between the sheet metal WW and the stripper 31 is under low pressure immediately after the stripper 31 rises, so air flows in from the surrounding area of ​​this space. This phenomenon is associated with the rise of the stripper 31 and the punch 32, so an upward airflow is generated around the sheet metal WW from the lower die 2 to the upper die 3.

[0043] If the rigidity of the sheet metal WW is low, the sheet metal WW will rise with the rising airflow. In other words, the sheet metal WW will rise along with the upper die 3. This phenomenon increases the vertical movement of the sheet metal WW, causing it to bend. This phenomenon is more likely to occur downstream of the press working device 1, especially with the use of double-row cuts of products and the thinning of the sheet metal WW.

[0044] Meanwhile, while the upper die 3 is rising, the feed device transports the sheet metal WW to the next process. If the sheet metal WW does not rise with the upper die 3, it will be fed to the next process while in contact with the lifter 22. The feed device then stops feeding the material at a predetermined position, and the sheet metal WW is punched by the next punch 32. However, if the sheet metal WW is fed by the feed device while rising with the upper die 3, when the feed device stops feeding the material, the sheet metal WW will flutter due to gravity causing it to descend and due to inertia. This fluttering of the sheet metal WW can cause feeding problems, such as the sheet metal WW interfering with the edge of the die hole 211 or the lifter 22.

[0045] This phenomenon will be explained using drawings. Figure 3 is a schematic diagram of a press working apparatus that does not include the pressing member 33. Figure 4 is a schematic diagram relating to the lifting phenomenon of the sheet metal. Figure 5 is a schematic diagram of the movement of the sheet metal. Note that in Figures 3 to 5, the lifter does not have a rotatable structure. After the sheet metal is punched, the lifter rises along with the rise of the stripper, pushing up the sheet metal. In the ideal state shown in Figure 3, even if the upper die continues to rise, the sheet metal is fed to the next process while in contact with the lifter.

[0046] However, when an updraft occurs, the sheet metal rises along with the rise of the upper die, as shown in Figure 4. When the feed device attempts to move the sheet metal to the next process while it is rising, the sheet metal wobbles as shown in Figure 5 due to gravity causing it to descend and inertia when the feed device starts and stops feeding the material. As a result, the sheet metal interferes with the die holes, etc.

[0047] By providing the pressing member 33, the fluttering of the sheet metal WW can be suppressed. Specifically, when upward pressure is applied to the sheet metal WW, the pressing member 33 presses the sheet metal WW from above, thereby suppressing the lifting of the sheet metal WW when the upper die 3 rises and suppressing fluttering when the sheet metal WW is fed. There are holes on the sheet metal WW created by punching out the punched sheet metal WO, but these holes are not affected by the upward airflow. Therefore, it is effective to position the pressing member 33 so as to press the large area of ​​the sheet metal WW that does not have these holes.

[0048] Here, we consider the case where the pressing member 33 separates from the sheet metal WW before the stripper 31 reaches its top dead center, that is, the case where the pressing member 33 does not come into contact with the sheet metal WW during transport. In this case, the contact portion 331 of the pressing member is located in the space between the sheet metal WW and the upper die 3 during transport. In this case, when the pressing member 33 separates from the sheet metal WW, the sheet metal WW may flap due to upward pressure. If the feed device starts to feed the sheet metal WW in this state, the sheet metal WW may interfere with the contact portion 331 of the pressing member 33 located in the space between the sheet metal WW and the upper die 3.

[0049] Because the contact portion 331 is rotatable in the direction of transport of the sheet material WW, even if the sheet material WW and the contact portion 331 interfere with each other, there is no substantial speed difference between the sheet material WW and the rotating contact portion 331, or only a slight speed difference. Therefore, the generation of frictional force on the sheet material WW due to interference with the contact portion 331 can be suppressed. As a result, the occurrence of the sheet material WW getting caught on the contact portion 331 during the process of transporting the sheet material WW can be suppressed.

[0050] A similar effect is achieved because the contact portion 221 of the lifter 22 is rotatable in the conveying direction of the sheet material WW. That is, if the sheet material WW is fluttering, it may interfere with the contact portion 221. Even if the sheet material WW and the contact portion 221 interfere, there is no substantial speed difference between the sheet material WW and the rotating contact portion 221, or only a slight speed difference. Therefore, the generation of frictional force on the sheet material WW due to interference with the contact portion 221 can be suppressed. As a result, the occurrence of the sheet material WW getting caught on the contact portion 221 during the conveying process of the sheet material WW can be suppressed. Thus, the press working apparatus 1 according to this disclosure can suppress the getting of the sheet material WW.

[0051] Furthermore, when the contact portion 331 comes into contact with the sheet material WW during transport, the press working apparatus 1 can further suppress the sheet material WW from getting caught. That is, when the upper die 3 is raised, the contact portion 331 always presses the sheet material WW from above, so the pressing member 33 can further suppress the occurrence of fluttering of the sheet material WW. As a result, the press working apparatus 1 can further suppress the sheet material WW from getting caught.

[0052] (Embodiment 2) Figure 6 is a schematic diagram of the press working apparatus 1a according to this disclosure. In the press working apparatus 1a, the contact surface of the lifter 22a with the sheet metal WW does not have a rotatable structure. That is, The press working apparatus 1a according to this embodiment is the same as the press working apparatus 1 according to Embodiment 1, but with the lifter 22 replaced by a lifter 22a. Components of the press working apparatus 1a that are the same as those in the press working apparatus 1 are denoted by the same reference numerals and their descriptions are omitted. Similarly, components of the lifter 22a that are common to the lifter 22 are also omitted from the description as appropriate.

[0053] Lifter 22a, like lifter 22, is a device for releasing and supporting sheet metal WW from the lower die 2. Lifter 22a includes a contact portion 221a and a connecting portion 222. The upper surface of the contact portion 221a abuts against the lower surface of sheet metal WW when sheet metal WW is punched or when sheet metal WW is fed forward. When the upper surface of the contact portion 221a abuts against the lower surface of sheet metal WW when sheet metal WW is fed forward, sheet metal WW slides along the upper surface of the contact portion 221a. The shape of the contact portion 221a can be, for example, cylindrical or prismatic. The contact portion 221a may also have a tapered portion in the forward or opposite direction of the sheet metal WW. In Figure 1, the contact portion 221a is columnar and has tapered portions in the forward and opposite directions of the sheet metal WW. The connecting portion 222 is the same as the connecting portion 222 related to the press working apparatus 1, so its description is omitted.

[0054] The press working apparatus 1a according to this disclosure can suppress snagging of the sheet metal WW even when the lifter 22a does not have a rotating mechanism. That is, because the contact portion 331 of the pressing member 33 is rotatable in the direction of conveying the sheet metal WW, even if the sheet metal WW and the contact portion 331 interfere with each other, there is no substantial speed difference between the sheet metal WW and the rotating contact portion 331, or only a slight speed difference. Therefore, the generation of frictional force on the sheet metal WW due to interference with the contact portion 331 can be suppressed. As a result, snagging of the sheet metal WW against the contact portion 331 can be suppressed during the process of conveying the sheet metal WW.

[0055] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit. [Explanation of Symbols]

[0056] 1 Pressing device, 1a Pressing device, 2 Lower die, 3 Upper die, 21 Die, 22 Lifter, 22a Lifter, 31 Stripper, 32 Punch, 33 Pressing member, 211 Die hole, 212 Holding part, 221 Contact part, 221a Contact part, 222 Connecting part, 311 Punch hole, 312 Holding part, 331 Contact part, 332 Connecting part, WW Sheet material, WO Punched sheet material

Claims

1. A processing apparatus for press-forming sequentially fed sheet metal using an upper die and a lower die equipped with a punch and a stripper, The upper mold is equipped with a pressing member that presses down on the plate material when the stripper rises, and whose contact surface that abuts against the plate material is rotatable in the direction of the plate material's movement. Processing equipment.

2. The pressing member presses down on the plate material as it moves. The processing apparatus according to claim 1.

3. The pressing member has a contact surface that is formed in an arc shape when viewed from the width direction of the plate material. The processing apparatus according to claim 1.

4. The pressing member ensures that, when the plate material comes into contact with the contact surface, there is no substantial speed difference between the speed at which the plate material moves and the rotational speed of the contact surface. The processing apparatus according to claim 1.

5. The processing apparatus further includes a lifter installed on the lower die, which lifts the sheet material when the sheet material is fed sequentially. The lifter has a surface that contacts the plate material and is rotatable in the direction of the plate material's movement. The retaining member and the lifter are provided at opposing positions. The processing apparatus according to any one of claims 1 to 4.

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