KR940011510B1 - Forming apparatus & method of steel plate - Google Patents

Abstract

The apparatus for forming a plurality of corrugation grooves on the steel plate applied to the outside wall for railway vehicle or the bus, comprises die assembly member having a die (5) with a line of corrugation forming groove (6), die-plate for fixing and supporting the die on upper body of the press; punch assembly member having a punch (15) with projections for forming corrugation, hydraulic cylinder for driving the punch, stripper (13) with a center hole (14) for supporting the steel plate (S), sliding bushing (12) for supporting cushion pad (16) attached on the rod of the cylinder (18), punch plate (18) for fixing the punch assembly member on the press body; stoppers (22,22',22") for stopping the feed of steel plate regularly.

Description

Forming apparatus of structural steel plate

1 is a schematic external view of a structural steel plate having a plurality of corrugations formed on one side outer wall of a railway vehicle.

2 is a cross-sectional view taken along line II-II of FIG. 1 with end caps installed at both ends.

3 is a schematic cross-sectional view of a conventional forming method for forming a plurality of corrugations on a structural steel sheet.

4 is a plan view of FIG.

5 is a schematic perspective view of a molding apparatus according to the present invention.

6 is a cross-sectional view taken along line VI-VI of FIG. 5 of a molding apparatus according to the present invention.

7 is an enlarged view of part X of FIG.

8 (a), 8 (b) is an operation of the molding apparatus according to the present invention.

9 is a plan view of a final steel sheet in which a plurality of corrugations are formed by the apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

1 die assembly 3 die plate

5 die 6 groove

7: Punch Assembly 8: Punch Plate

12: sliding bushing 13: stripper

14 through hole 15 punch

18: hydraulic cylinder 21: feed table

22, 22 ', 22 ": Stopper 23: Pin

24: spring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forming a large number of corrugations on structural steel sheets, in particular steel sheets (hereinafter, simply referred to as "outer plates") that are attached to outer walls of both sides of railroad cars and buses.

In a railroad car or a bus, as shown in FIG. 1, an outer plate is attached to the side of the vehicle for structural strength reinforcement, etc. Furthermore, recently, the appearance of the vehicle is improved in addition to the purpose of the outer plate. To this end, there is a tendency to form a plurality of corrugations in the longitudinal direction of the shell.

In order to reduce the weight of the vehicle, it is desirable to adopt a steel sheet as thin as possible.

Conventionally, one method for forming a plurality of corrugations on the outer plate is a roll forming method, which is arranged by placing a pair of rollers above and below the flat steel sheet to be molded, and transferring the steel sheet between the upper and lower rollers. It is to form a plurality of corrugations by the pressing force of the rollers.

However, since the outer shell formed by the roll forming method has a corrugated protrusion having a constant cross section over the entire length of the outer shell in the longitudinal direction, in order to attach it to the outer wall of both sides of the vehicle by welding, both longitudinal edges of the corrugation The end caps (H in FIG. 2), which have recesses and flat portions to be mated with the cross-sectional formation of H, are processed separately and the end caps are attached to both longitudinal edges of the outer plate, thereby bringing the exterior to the vehicle body. It is fixed.

Accordingly, in the case of the roll forming method described above, a separate end cap processing step for attaching various problems, namely, an outer plate on which the corrugation is formed, is added, and the assembling and attaching process of the end cap is difficult, As the work process is excessive, the productivity is greatly reduced, and as shown in FIG. 2, a layer having a thickness d of the cap is formed at the overlap between the outer plate and the end cap, which significantly impairs the exterior appearance of the vehicle. .

As another method, a single body forms a desired number of corrugation processing recesses in a die portion in a mold, and a press molding method in which a plurality of corrugations are simultaneously formed on a steel sheet using this mold.

In this method, the curved projections on both edges of the corrugation and the flat part of the steel sheet can be molded seamlessly together, and there is an advantage of not having to use a separate end cap when attaching the outer plate. As a result, the press is required to be considerably large in size, thereby increasing its installation space, which is counterproductive.

On the other hand, STS 304 stainless steel is mainly used as a material of structural steel sheet for a vehicle, in particular, a railway vehicle outer plate. However, compared to the above-described STS 304 stainless steel, there has been a demand for development of a high strength steel sheet which is more suitable for weight reduction of the vehicle, improvement of strength of steel sheet, and improvement of weldability. Rivers.

This SUS 301 L stainless steel has increased yield stress and tensile strength while decreasing elongation as compared to STS 304 stainless steel, as shown in Table 1 below.

TABLE 1

KSD 3698 (JIS G 4307), KSD 3705 (JIS G 4305)

For this reason, when a large number of corrugations are formed in a steel plate made of SUS 301 L stainless steel using the conventional press forming method described above, a press having a larger capacity than that of an STS 304 stainless steel plate having the same thickness (t = 1.5 mm) It is necessary to increase the installation cost, and also many presses on SUS 301 L stainless steel plate of thinner thickness (t = 1.2mm) by using the press used for forming STS 304 stainless steel sheet (t = 1.5mm). When simultaneously forming the gating, it was not possible to obtain a high quality shell having a desired corrugation shape.

On the other hand, as a corrugation molding method in which the conventional roll forming method and the press molding method described above are improved, Korean Patent Publication No. 89-2734 discloses that a part of the corrugation is locally formed by press working, and subsequently A molding method is disclosed in which a sequential press working is repeatedly performed at a predetermined pitch in the longitudinal direction (see FIGS. 3 and 4).

However, according to this method, the projections at the edges of both ends of the corrugation can be smoothly formed integrally with the flat portion of the steel sheet, while the manufacturing process is quite inconvenient.

That is, as can be seen in FIG. 4, the forming of the curved surface processed corrugation portion A at the right end, the body portion B of the corrugation, and the curved surface processed corrugation portion C at the left end At the same time, die and punch should be replaced for each part. In addition, as shown in FIG. 3, since the steel plate is formed by sequentially moving the steel plate by a predetermined pitch in the longitudinal direction of the corrugation to be formed, excessive work time is required and the sequential movement can be accurately executed. Adoption of expensive CNC transfer systems is inevitably required.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a molding apparatus for a structural steel sheet capable of forming by a compact press.

Another object of the present invention is to provide an apparatus for forming a structural steel sheet, which reduces the labor maneuverability and improves the beauty of appearance.

Still another object of the present invention is to provide an apparatus for forming a structural steel sheet, wherein both ends of the smooth curved surface of the corrugation are integrally formed with the main body of the corrugation.

In order to achieve the above object, the molding method according to the present invention is a corrugated sheet having a plurality of corrugations, which are intermittently transferred to the steel sheet in the transverse direction at a predetermined interval in the width direction thereof, closest to the tip side of the conveying direction of the steel sheet. It is characterized by molding sequentially from the gate.

Another solution for achieving the above object of the present invention comprises a die assembly, a punch assembly and a plurality of stoppers, the die assembly comprising: a die having a set of grooves having the same shape as the convolution to be molded; A die plate for fixing and supporting the die to the upper body of the press, wherein the punch assembly includes a punch having a protrusion formed into the recess of the die to form a desired corrugation; A hydraulic cylinder which provides a pressing force for forming against the punch; A stripper supporting and holding a steel sheet placed on an upper surface during molding, and having a through hole through which the punch passes; A sliding bushing for slidingly supporting a buffer pad attached to a rod of the hydraulic cylinder; A punch plate for firmly fixing and supporting the punch assembly to the lower main body of the press as the outer frame of the punch assembly, wherein the stopper is desired to be transported continuously installed at the same height as the upper surface of the stripper of the punch plate. A molding apparatus is provided, which is arranged at the same interval as the widthwise gap between the corrugations to stop the transfer of the steel sheet at regular intervals.

Hereinafter, non-limiting embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a schematic perspective view of a molding apparatus according to the present invention, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. Referring to FIG. 5 and FIG. 6, first of all, the construction of the die assembly 1 of the molding apparatus of the present invention will be described. (1) shows a die plate for holding and supporting the upper body (2) of the press, the lower portion of the die plate (3) is a mechanical load applied to the die assembly by the impact force according to the operation of the punch to be described later during molding The cushioning plate 4 which relaxes is fixed. In addition, the die 5 is detachably fixed to the lower portion of the buffer plate 4, and a set of grooves 6 having the same shape as the conduit to be formed on the structural steel plate is formed on the lower flat surface of the die. Is formed.

Next, the punch assembly 7 of the molding apparatus of the present invention which operates in synchronization with the above-described die assembly will be described. As can be seen in FIGS. 5 and 6, reference numeral 8 is the outer frame of the punch assembly 7, which is similar to the die plate 3 described above, on the bracket 10 ′ marked with an imaginary line. This represents a punch plate whose bottom part is fixedly supported by the lower main body 10 of the press. On the inner side of the side wall 9 of the punch plate 8, a sliding bushing for forming a space 11 in which a rod and a buffer pad of a hydraulic cylinder, which will be described later, are integrally formed so as to reciprocate in the vertical direction in a sliding motion ( 12) is fixed, the punch through hole to be described later located above the sliding bushing 12 is located on the upper surface of the stripper 13 formed therein in the longitudinal direction substantially the same as the length in the longitudinal direction of the punch. It serves to support the retained steel sheet (S). On the other hand, a punch 15 having a head which is inserted into the recess 6 on the lower surface of the die and formed to form a desired corrugation into the through hole 14 formed in the center of the stripper 13 is an upright state. Located on the bottom surface of the punch 15, there is a cushion pad 16 for absorbing the mechanical load on the punch assembly 7 due to the impact force of the operation of the punch at the time of molding, the cushion pad 16 The hydraulic cylinder 18 is provided on the lower surface of the bottom surface) to receive the fluid pressure from an unillustrated hydraulic pressure supply means and to stretch the length of the rod 17 to provide the pressing force to the punch 15 described above. In this embodiment, 10 hydraulic cylinders are all distributed at equal intervals in the longitudinal direction of the punch assembly. However, the present invention is not limited thereto, and plastic deformation force sufficient to form a desired corrugation according to the shape and length of the workpiece is provided. It is also possible to vary the number of hydraulic cylinders actuated to have a lower capacity.

According to this configuration, the rod cylinder 17 of the hydraulic cylinder expands and contracts at a predetermined stroke distance δ by the operation of the hydraulic cylinder 18, and the stroke distance δ is adjusted to the cross-sectional shape of the corrugation to be molded. It depends on the function.

In FIG. 5, reference numeral 19 denotes a guide post for preventing slip or misalignment between the die assembly and the punch assembly during molding operation, and reference numeral 20 denotes an insertion hole into which the guide post is inserted.

On the other hand, as shown in Figure 6, one side (right side in the drawing) of the punch assembly (7), a feeder 21 for smoothly conveying the steel sheet during molding is provided, the upper surface of the feeder The same height as the upper surface of the stripper 13 is maintained. In addition, a plurality of stoppers 22, 22 ', and 22 "are attached to the feed table 21 at equal intervals and distances. The distances between the stoppers are equal to the distance between the centers of the two neighboring corrugation tanks. The stoppers 22, 22 ', 22 ", as shown in detail in FIG. 7, are mounted inside the feed table 21 and are displaced T-shaped pins for stopping the conveyed steel sheet ( 23 and a spring 24 positioned at the bottom of the pin 23 to move the pin up and down on the upper surface of the carriage by the elastic force. As seen in the figure, the upward movement of the pin 23 by the spring 24 is limited by the lateral projection of the pin 23 contacting the bottom surface of the stepped portion formed in the feed table 21, the pin 23 being the maximum. The protruding length above the upper surface of the feed table 21 when it is raised to be about 2 to 3 times the thickness of the steel sheet so as to sufficiently stop the conveyed steel sheet.

In addition, the lowering of the stoppers 22, 22 ', 22 "is made to synchronize with the shaping | molding step of a corrugation leg.

Now, a molding method of molding a plurality of sets of corrugations on a high strength steel sheet such as SUS 301 L by using the above-described molding apparatus will be described.

After the molding apparatus of the present invention described above is set on a press, the structural steel sheet S, which is a workpiece, is passed between the die assembly 1 and the punch assembly 7 in a non-operational state, and the conveying direction of the steel sheet (first The tip of the 6-degree " ga " direction is conveyed on the feed table 21 until it comes in contact with the first stopper 22 and stops.

Next, the molding apparatus is operated to form a set of corrugations (a in FIG. 9) on the structural steel sheet by the pressing force of the die 5 and the punch 15.

8 (a) and 8 (b) show the operation of the die and the punch of the molding apparatus in order to examine the above-mentioned forming process in more detail. In the drawing, the vertical axis indicates the operating position of the die and the punch. , Horizontal axis means molding time.

Claim 8 (a) As can be seen in Fig, interval O ~ DT ₂ is die 5 has a section which falls, in particular DT ₁ ~ DT ₂ is the die of a segment O ~ DT ₁ as the starting point a DT ₁ It means a section descending at a lower speed than the descending speed, the section DT ₂ ~ DT ₃ is a section in which the die presses the steel sheet against the stripper 13 of the punch assembly with a predetermined input, the section after DT ₃ is the pressurized die Indicates the interval to complete and ascend upwards.

In addition, in FIG. 8 (b), the section O to PT ₁ is a section in which the punch 15 is held in the lowered position as the operation of the hydraulic cylinder 18 is delayed for a predetermined time T, PT _1. PT ₂ is a section in which the punch 15 rises at a low speed as the cylinder rod 17 extends as the hydraulic cylinder is operated and contacts the bottom surface of the steel plate. PT ₂ to PT ₃ are the punch 15 at a predetermined impact force. A section in which the corrugation is formed in the steel sheet in cooperation with the die 5 is a section in which the PT ₃ or less is a section in which the punch is spaced apart from the steel sheet and descends to its original position immediately after the formation of the corrugation. The reason why the micro-time interval t is provided in the above operation degree is that when the punch is raised to impact the steel sheet to form the corrugation, the steel sheet portion around the formed corrugation is unnecessarily tensioned and deformed so as not to deform. This is to meet certain stable conditions.

In the molding apparatus according to the present invention, the die 5 and the punch 15 are operated in perfect tuning by a control device not shown in accordance with the above-described operation degree.

Immediately after forming a set of corrugations (a) through the above operation process, the die 5 is raised to its original position and the punch 15 is also lowered to its original position to form a second corrugation (a '). Be prepared. In this way, one cycle of the molding apparatus is completed. Subsequently, for example, a sensor (not shown) detects that the molding of the first corrugation a is completed and sends a signal to the stopper lowering means (not shown), whereby the stopper lowering means stops against the elasticity of the spring 24. 1 The stopper 22 is lowered. Subsequently, the steel sheet is conveyed on the feed table 21 by a steel sheet supply means, not shown, until the feed direction leading end of the steel sheet is caught by the protruding portion of the second stopper 22 '. Then, the cycle of forming the first corrugation a is repeated to form a second corrugation a 'on the steel sheet. Subsequently, the above cycle is repeated using the third stopper 22 "to form the third corrugation a" on the steel sheet.

As described above, when it is desired to form the desired number of corrugation tanks on the steel sheet, the desired purpose can be achieved by sequentially repeating the corresponding number of molding cycles sequentially.

As described above, according to the present invention, by using a die in which only one set of grooves is formed, a series of presses are sequentially pressed at a predetermined interval in the width direction of the steel sheet, and a desired number of corrugations are applied to the steel sheet. It is possible to form, it is possible to form the vehicle outer plate of the high-strength steel sheet material by a small-capacity press and forming apparatus.

In addition, a hydraulic cylinder is provided in the punch assembly of the forming apparatus, and the punch assembly is operated in perfect synchronization with the die assembly, so that when the corrugation is processed on the top plate, the steel sheet material around the corrugation into the molding portion. Unnecessary suction is prevented.

Furthermore, the edges of the ends of each jaw of the corrugation developed in the longitudinal direction of the steel sheet maintain a predetermined curved shape and are formed integrally with the adjacent flat portions of the steel sheet, thereby providing a separate end cap. Without welding, it can be attached to a vehicle body by welding.

In order to change the cross-sectional shape of the corrugation to suit the type of vehicle, only the die assembly and the punch assembly are replaced, whereby an outer plate having various corrugations having different desired lengths, heights and cross-sectional shapes is provided. It can be formed easily.

Claims (3)

The die assembly consists of a die assembly, a punch assembly and a plurality of stoppers, the die assembly having a set of grooves 6 having the same shape as the corrugation to be molded, and the die 5 being placed at the top of the press. A die plate (3) fixed and supported on the main body; The punch assembly is provided with a punch 15 having a protrusion shaped to be inserted into the recess 6 of the die 5 to form a corrugation, and a hydraulic cylinder for providing the pressing force necessary for molding against the punch 15. 18 and a stripper 13 having a central portion formed therein with a through hole 14 through which the punch 15 penetrates while holding the steel sheet S placed on the upper surface during molding, and the hydraulic cylinder 18 of the hydraulic cylinder 18. Sliding bushing 12 for slidingly supporting the cushion pad 16 attached on the rod 17, and punch plate 18 for firmly fixing and supporting the punch assembly to the lower body of the press as an outer frame of the punch assembly. ); The stoppers 22, 22 ', 22 " are disposed at the same height as the widthwise gaps between the corrugations on the transfer targets continuously installed at the same height as the upper surface of the stripper 13 of the punch plate 8. Molding apparatus for structural steel sheet, characterized in that for stopping the feed at a fixed cycle. 2. The longitudinal edge of each of the punches 15 and the die 5 is formed so that the longitudinal edges of each of the corrugations are formed to be seamlessly integrally connected and molded into the flat surface of the steel sheet. Apparatus for forming structural steel sheets having the same shape as curved surfaces at both edges. The stopper (22, 22 ', 22 ") is installed in a groove formed in the inside of the feed table 21, and the displaced T-shaped pin 23 for stopping the steel sheet to be conveyed And a spring (24) positioned at the bottom of the pin to lift and move the pin (23) to the reference line on the upper surface of the feed table (21) by elastic force.