JP5299056B2 - Multi-process press machine and press working method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine which can perform many kinds of working stages including a working stage(s) with a long working time by one press machine, and to provide a working method using the press machine. <P>SOLUTION: In the press machine for the plurality of stages where a belt-like material is subjected to press working in a plurality of stages, in at least one stage therein, the profile of a cam is formed in such a manner that, in a state where the belt-like material is stopped, a punch progresses toward the belt-like material and is abutted against the belt-like material so as to perform the first stage of working to the belt-like material; thereafter, the progress of the punch is inverted; the punch is retreated so as to be separated from the belt-like material; further, the progress of the punch is inverted once more; and the punch progresses toward the belt-like material once more and is abutted against the worked part in the first stage of the belt-like material so as to perform the second stage of working to the belt-like material. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a multi-step press machine and a press processing method for performing multi-step press processing on a strip-shaped material.

  2. Description of the Related Art In recent years, automation of press processing and higher efficiency have progressed, and multi-step press machines that simultaneously perform a plurality of molding processes using a single apparatus have become widespread. In this type of press, a plurality of lower dies are arranged on the bed, and on the other hand, the upper dies are suspended on the slides that are moved up and down by the rotation of the crankshaft, respectively, and combined with a conveying device that conveys the workpiece. Automated press forming is performed. That is, the work is sandwiched and pressed between the molds in the first step, and when one molding is completed, the work is moved horizontally by the operation of the transfer device and transferred to the next adjacent mold. The process of receiving the pressure is repeated, and a single press machine is operated through a plurality of processes to consistently perform molding at a large processing ratio, so that processing with high work efficiency and high productivity is realized.

  However, in a conventional multi-process press, a connecting rod linked to the eccentric part linked to the rotation of one crankshaft is lifted and lowered at the same time, and a slide suspended at the lower part is lifted and lowered at the same time. Press the workpieces lined up at the same time. For this reason, the load applied to the press machine at this time is the sum of all the processing loads generated in the plurality of dies. Assuming that three types of molds are arranged in one press machine and press molding in three steps proceeds simultaneously, the load generated in the first step is K1, the load generated in the second step is K2, and the load generated in the third step is Assuming K3, these press moldings proceed simultaneously, so the total amount of load generated in the entire press is the sum of the individual loads, and K1 + K2 + K3 = KT. Naturally, if the number of processing steps increases, and the molding ratio per process increases, the sum will increase, and the rigidity of the press machine must also be extremely strong in order to withstand enormous loads. It becomes. After all, the press machine becomes huge, requires a large installation area, and other incidental facilities must be large-scale. In recent years, the contents of molded products by press machines tend to be more and more diverse, and products molded by one machine have various aspects. For this reason, in a large-sized press machine, a state in which versatility is generally impaired due to excessive capacity frequently occurs. In particular, if a stamped product that can be molded with a small load and with a light load is produced with an excessively large facility, the loss is too large, the energy intensity increases, the productivity is low, and the production cost is greatly adversely affected. There is a high level of concern. In such a case, it is necessary to separately provide a light load press in parallel.

  Patent Documents 1 to 3 disclose a press machine that solves such a problem, that is, a press machine that has a relatively small-scale and economical structure in spite of being multi-step. For example, the technique disclosed in Patent Document 2 is as follows. That is, it is assumed that a single press has three dies and a multi-step press that advances three steps. In this press machine, the eccentric portion of the crankshaft is not provided with a single eccentric shaft, but has three eccentric shafts that are out of phase. For this reason, the second and third steps are not performed at the moment when the first step is performed. The load applied to the entire press at this time is only the load K1 in the first step. After the first step is completed and the crankshaft rotates by a predetermined angle, the second step is performed. At this moment, the load applied to the entire press is only the load K2 of the second step. When the second step is completed and the crankshaft rotates by a further predetermined angle, the third step starts and a load K3 is generated. Thus, since each press molding proceeds continuously with a time lag, it is sufficient to assume that the maximum value of the load applied to the entire press machine is K3 which is the maximum of individual loads. Become.

  However, in the case where three kinds of processes as described above do not end the process, and for example, a very many kinds of process steps that require six processes are performed by one press machine (that is, one camshaft), Each time to cam phase (360 °) is included when processing steps are required that require a longer processing time than other types of processing steps (eg punching small holes), such as bending or drawing. Process allocation may be difficult.

JP-A-8-206883 JP-A-6-297195 JP-A-9-314396

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a press machine capable of executing various types of machining processes including a machining process having a long machining time with a single press machine, and the press machine. It is to provide a processing method using.

According to the first aspect of the present invention, the multi-step press (100) is:
A multi-step press (100) that performs multi-step pressing on the strip material (W),
A set of gold consisting of a drive source (M), a camshaft (1) driven by the drive source (M) and having a plurality of independent cams, a punch (2) and a die (3) connected to the cam A mold comprising a plurality of molds and a gantry (5) for supporting the molds;
The plurality of molds are arranged along the axial direction of the camshaft (1),
Each cam is formed in a profile suitable for each process so that each cam performs pressing in each process in cooperation with each punch (2) and each die (3),
The belt-shaped material (W) is moved between the punches (2) and the dies (3) at regular pitches along the axial direction of the camshaft (1). And collaborative press work of each die (3) is sequentially performed at time intervals,
In at least one of the steps, in a state where the belt-like material (W) is stopped, the punch (2) advances toward the belt-like material (W) and comes into contact with the belt-like material (W) to form the belt-like material ( After the first stage of processing is performed in (W), the progress of the punch (2) is reversed, the punch (2) is moved back away from the strip-shaped material (W), and the punch (2) The progress of 2) is reversed again, and the punch (2) advances again toward the band-shaped material (W), and comes into contact with the first stage processing location (W1) of the band-shaped material (W). (W) is characterized in that the profile of the cam is formed so that the second stage of machining can be performed.

In a machining process with a long machining time, the machining time (cam angle) can be divided into about a half by performing the pressing process in two stages rather than in one stage. This ensures a degree of freedom in assigning each process to the cam angle phase (360 °) and can perform various types of machining processes including machining processes with a long machining time with a single press machine. Can be provided.

According to the 2nd form of this invention, the multi-process press (100) processes the said strip | belt-shaped material (W) into the components for heat exchangers, It is characterized by the above-mentioned.
The specific aspect of a processed product is specified.

According to the third aspect of the present invention, a method for processing a band-shaped material (W) using a multi-step press (100) includes:
In the state where the band-shaped material (W) is stopped,
The punch proceeds toward the band-shaped material (W) and abuts against the band-shaped material (W) to perform a first stage processing on the band-shaped material (W);
Reversing the punch (2) so that the punch (2) moves away from the strip material (W) by reversing the progress of the punch (2);
The progress of the punch (2) is reversed again and the punch (2) proceeds again toward the band-shaped material (W);
Performing the second stage processing on the strip material (W) in contact with the first stage processing location (W1) of the strip material (W);
It is characterized by providing.

In a machining process with a long machining time, the machining time (cam angle) can be divided into about a half by performing the pressing process in two stages rather than in one stage. This ensures a degree of freedom in the allocation of each process to the cam angle phase (360 °) and enables a single press to perform various types of machining processes including machining processes with a long machining time. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 8, members or means having the same function are denoted by the same reference numerals or numbers, and the description thereof is omitted.

It is a typical sectional view of a press. It is a schematic diagram of continuous press processing of a strip-shaped material. This is a heat exchanger part that has been pressed. It is a phase diagram of the cam of the present invention. It is operation | movement explanatory drawing of the conventional punch. (A) It is the stroke diagram (cam lift diagram) of the conventional punch. (B) It is a press load diagram by the conventional punch. It is operation | movement explanatory drawing of the punch of this invention. (A) It is the stroke | process diagram (cam lift diagram) of the punch of this invention. (B) It is a press load diagram by the punch of this invention.

  A multi-step press 100 according to the present invention is schematically shown in FIG. The press machine 100 includes a servo motor M, a camshaft 1 connected to the servo motor M and driven by the servo motor M, and six continuous pressing units 10, 20, 30, 40, 50, 60. . The pressing units 40, 50, and 60 are not shown because there are limitations on the paper surface.

  The processing unit 10 supports a slider 4a connected to the cam 1a, a punch (upper die) 2a that receives a pressing force by the slider 4a, a die (lower die) 3a that forms a pair with the punch, and a die 3a. The gantry 5 is provided. The slider 4a is slidably disposed in a cylinder (not shown), is urged toward the cam side (upward) by a return spring (not shown), and is always in contact with the cam profile surface. Yes. The other processing units 20, 30, 40, 50 and 60 have the same structure as the processing unit 10. Therefore, the plurality of dies (each punch and each die) are arranged along the axial direction of the camshaft.

  The workpiece W subjected to press working is a strip-shaped material having a width of, for example, 60 mm, and the raw material is in a coil C state. The workpiece W is conveyed from the coil C via the conveying roller 6, and each punch 2a, 2b, 2c, 2d, 2e, 2f of each processing unit 10, 20, 30, 40, 50, 60 and each die 3a, 3b. 3c, 3d, 3e, and 3f while being intermittently pressed. The work W is intermittently conveyed along the axial direction of the camshaft 1 at a constant pitch feed (for example, 30 mm) every time each press work in each process is completed.

  FIG. 2 shows a schematic diagram of continuous pressing of the strip material W. The strip material W is an aluminum material having a plate thickness of 1.2 mm. The six steps will be briefly described with reference to FIG. In the first step, trimming, corner processing, straight drawing, and rib forming are performed on the band-shaped material W. In the second step, corner portion shaping, trimming, and corner portion deburring are executed. In the third step, straight portion shaping, notching, burring, pilot burring, and pilot portion crushing are executed. The third process has the longest processing time among the six processes. In the fourth step, side trimming and side part deburring are performed. The fifth step performs side part bending. In the sixth step, corner drawing, insert bending and cutting are performed.

  The heat exchanger component is processed through these six steps. FIG. 3 shows the heat exchanger component 90 that has been processed. 3, (a) is a side view of the heat exchanger component, (b) is a bottom view of (a) viewed from the X direction, and (c) is an end surface of (b) viewed from the Y direction. FIG. Reference numeral 90a denotes a through hole into which a tube through which cooling water flows is inserted.

Returning to FIG. 1, one camshaft 1 includes six cams 1 a, 1 b, 1 c, 1 d, 1 e, 1 f, and six pressing units 10, 20, 30, 40, 50, 60 is installed through. Each cam has a different shape (cam profile), and a phase angle A ₀ having a maximum lift Lmax for performing the press working is also shifted from each other.

  The camshaft 1 rotates at 60 rpm, for example. When the camshaft 1 rotates, the slide 4a first reaches the bottom dead center, and the workpiece W is pressed between the punch 2a and the die 3a to be molded. When the camshaft 1 further rotates, the slide 4b reaches the bottom dead center and forms a workpiece. In this way, as the crankshaft rotates, the slides reach the bottom dead center one after another and perform molding one after another. However, the press molding processes do not overlap in time, and a certain time interval is maintained. Are executed individually. If the load (press load P) generated in all the steps is the same, the load generated in the entire forging press is simply 1/6 compared to the prior art.

Each cam has a different shape (cam profile), and a phase angle having a maximum lift for performing the press working is also shifted from each other. Here, each of the cams 1a, 1b, 1d, 1e, and 1f has a cam profile (see FIG. 5) capable of executing a normal one-stage press process, and the cam 1c can execute the two-stage press process of the present invention. Cam profile (see FIG. 7). FIG. 4 shows a phase diagram of the cam. In FIG. 4, a, b, d, e, f , each cam 1a, 1b, 1d, 1e, represents the phase angle position _{A 0} of the maximum lift Lmax of 1f, c1, c2 are each cam 1c The phase angle positions of the first maximum lift Lmax1 and the second maximum lift Lmax2 are shown (see FIG. 8). Each cam is formed in a profile suitable for each process so that each cam 1a, 1b, 1c, 1d, 1e, 1f cooperates with each punch 2 and each die 3 to perform pressing in each process. ing.

FIG. 5 is an explanatory diagram of the operation of the conventional punch, FIG. 6 (a) is a stroke diagram (cam lift diagram) of the conventional punch, and FIG. 6 (b) is a press load diagram of the conventional punch. . Such an operation is an operation as a normal one-step press process, and is performed by the cams 1a, 1b, 1d, 1e, and 1f and punches connected thereto. In FIG. 5, A is a cam angle starting from the reference angle As, and L is a cam lift. The punch shown in FIG. 5 moves in a stroke represented by the cam lift shown in FIG. In FIG. 6 (b), P represents a press load the workpiece is subjected, A ₀ represents the phase angle position of the maximum lift.

  On the other hand, FIG. 7 is an operation explanatory view of the punch of the present invention, FIG. 8A is a stroke diagram (cam lift diagram) of the punch of the present invention, and FIG. 8B is a press by the punch of the present invention. It is a load diagram. The operation of the punch of the present invention will be described with reference to FIGS. The punch 2c of the present invention is a member provided in the press processing unit 30 that executes the third process, and is connected to the third cam 1c. Since the third process has the longest processing time among the six processes, the advantage of dividing the press processing into two stages is great.

  When the press work is being performed, the strip material W is stopped. In FIG. 4, the belt-like material W is in a stopped state from the cam angle 115 ° to 245 ° (Z). First, as shown in FIG. 7A, the punch 2c advances toward the band-shaped material W and comes into contact with the band-shaped material W to execute the first stage processing on the band-shaped material W (cam angles A1 to A3). Next, as shown in FIG. 7B, the advancement of the punch 2c is reversed and the punch 2c moves backward so as to be separated from the belt-like material W (cam angles A3 to A4). Then, as shown in FIG. 7C, the progress of the punch 2c is reversed again, and the punch 2c advances again toward the band-shaped material W, and comes into contact with the first-stage processing location W1 of the band-shaped material W. The second stage machining is performed on W (cam angles A5 to A7). Thereafter, the advancement of the punch 2c is reversed again, and the punch 2c moves backward so as to be separated from the strip material W (cam angles A7 to A8). A profile P1c of the cam 1c is formed so as to enable the operation of the punch 2c as described above.

  And the 4th punch 2d will perform the press work of a 4th process in the time slot | zone when the press work of the 3rd punch 2c is paused.

  As shown in FIG. 8A, the reason for retracting the punch 2c away from the belt-like material W at the cam angle A3 is as follows. That is, since the strip-shaped material W is aluminum which is an elastic material, it has a property of returning to the original state immediately after pressing. For this reason, if the punch is not detached from the belt-like material W when the processing is temporarily stopped, there is a possibility that the punch will be in a “biting” state in which the punch is fixed to the belt-like material W.

  Note that the maximum press load in the first stage and the maximum press load in the second stage are substantially the same. The maximum press load in the first stage or the maximum press load in the second stage is substantially equal to the maximum press load in normal one-stage press processing.

  As described above, it is possible to provide a press machine capable of executing various kinds of machining processes including a machining process with a long machining time with a single press machine, and a machining method using the press machine.

100 Press Machine of the Present Invention 1 Camshaft 2 Punch 3 Die 4 Slider W Workpiece

Claims (3)

A multi-step press (100) that performs multi-step pressing on the strip material (W),
A set of gold consisting of a drive source (M), a camshaft (1) driven by the drive source (M) and having a plurality of independent cams, a punch (2) and a die (3) connected to the cam A mold comprising a plurality of molds and a gantry (5) for supporting the molds;
The plurality of molds are arranged along the axial direction of the camshaft (1),
Each cam is formed in a profile suitable for each process so that each cam performs pressing in each process in cooperation with each punch (2) and each die (3),
The belt-shaped material (W) is moved between the punches (2) and the dies (3) at regular pitches along the axial direction of the camshaft (1). And collaborative press work of each die (3) is sequentially performed at time intervals,
In at least one of the steps, in a state where the belt-like material (W) is stopped, the punch (2) advances toward the belt-like material (W) and comes into contact with the belt-like material (W) to form the belt-like material ( After the first stage of processing is performed in (W), the progress of the punch (2) is reversed, the punch (2) is moved back away from the strip-shaped material (W), and the punch (2) The progress of 2) is reversed again, and the punch (2) advances again toward the band-shaped material (W), and comes into contact with the first stage processing location (W1) of the band-shaped material (W). The multi-process press (100), wherein the cam profile is formed so as to allow the second stage of processing to be performed in (W).   The multi-step press (100) according to claim 1, wherein the strip material (W) is processed into a heat exchanger component. A method for processing a band-shaped material (W) using the multi-step press (100) according to claim 1 or 2,
In the state where the band-shaped material (W) is stopped,
The punch proceeds toward the band-shaped material (W) and abuts against the band-shaped material (W) to perform a first stage processing on the band-shaped material (W);
Reversing the punch (2) so that the punch (2) moves away from the strip material (W) by reversing the progress of the punch (2);
The progress of the punch (2) is reversed again and the punch (2) proceeds again toward the band-shaped material (W);
Performing the second stage processing on the strip material (W) in contact with the first stage processing location (W1) of the strip material (W);
A method of processing a band-shaped material (W), comprising:

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