JP2010120027A - Press forming machine and blowing mechanism for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press forming machine with which scraps are surely discharged while suppressing the cost. <P>SOLUTION: The press forming machine 1 has a press forming machine body 2, a press die 34 which is installed on the press forming machine body 2 and a blowing mechanism 5. The blowing mechanism 5 is composed of: a funnel-shaped air intake part 51 which is installed adhering closely so as to cover an opening 41a and with which the air discharged from the opening 41a is taken in; piping 52 which is connected to the lower end of the air intake part 51 and with which the air introduced from the air intake part 51 is made to flow to a scrap chute 6; and a discharging port 53 from which the air flowing through this piping 52 is discharged onto the scrap chute 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press molding machine, and more particularly to a blower mechanism of a press molding machine.

  2. Description of the Related Art Conventionally, in a pressing process for forming an automobile panel or the like, unnecessary scrap steel plates (hereinafter referred to as scrap) are generated along with operations such as punching a panel and cutting an outer edge. This scrap is discharged out of the mold by a mechanism like a slide called a scrap chute from a press mold for forming the panel.

  FIG. 5 is a partial cross-sectional view schematically showing a part of such a conventional press molding machine. The press molding machine 101 includes a press machine main body 102, a press die 103, and a scrap chute 104. The scrap chute 104 is inclined moderately. The scrap S generated by the hole punching process is discharged by sliding down on the scrap chute 104.

  However, when continuous production is performed in the press process, scraps are clogged on the scrap chute, which may cause a so-called discharge failure, which hinders productivity improvement. Further, as a result of clogging of the scrap on the scrap chute, if the scrap accumulates up to the press die portion, the press die may be damaged.

Therefore, it is usually considered that the scrap chute surface is plated to reduce the coefficient of friction with the scrap so that the scrap chute is easily dropped. in this case,
1. 1. After making the scrap chute, make fine adjustments according to the mold body. 2. Order from surface treatment manufacturer. After completion of the surface treatment, a scrap chute having a reduced coefficient of friction is formed through a preparatory stage in which it is reassembled into the mold body and finely adjusted.

Another problem is that the scrap sticks to the surface of the scrap chute, resulting in a drop failure. For such a problem, it is considered to provide a structure that prevents scrap sticking by providing a small uneven shape on the surface of the scrap chute. in this case,
1. 1. After making the scrap chute, make fine adjustments according to the mold body. 2. Attaching the uneven sheet to the surface and welding. After welding, a scrap chute that prevents the sticking of scraps is configured through a preparatory stage in which the die is reassembled and finely adjusted.

Furthermore, by attaching a pressurized air supply source to the mold body and blowing air blow, that is, air, onto the surface of the scrap chute from there, this air pressure forcibly slips the scrap and prevents clogging of the scrap on the scrap chute. A mechanism to do this is also considered. in this case,
1. 1. Install a pressurized air supply source outside the mold. 2. Install piping to draw air from the pressurized air supply source into the mold. 3. Install air piping from the mold end to the scrap chute. A scrap chute that forcibly slides the scrap through a preparatory stage such as setting and adjusting the air blow-off.

Scrap chutes configured as described above are disclosed in Patent Documents 1 to 3.
In Patent Document 1, the bottom surface of the scrap chute is constituted by an upper plate and a lower plate that are overlapped with a space, and pressurized air is introduced between the upper plate and the lower plate, while the sliding surface of the slap lap chute is formed. By providing a number of air ejection holes on the top plate that eject air with a density and pressure that does not allow scrap to come into direct contact with the top plate, scrap that has fallen from the mold is brought into contact with the top plate. A scrap chute that is surely discharged without waste is disclosed.

  Further, in Patent Document 2, a scrap dispensing block having a front end surface that comes into contact with metal scrap pushed up from a die hole into a scrap discharge passage and a lower surface that is in sliding contact with a horizontal floor surface of the scrap discharge passage is provided on the other side of the scrap discharge passage. It is configured so that it can be forcibly moved in the direction of scrap discharge along the scrap discharge passage in synchronization with the close movement of the upper mold and the lower mold via the actuator arranged in the section. A metal scrap discharge processing device of a progressive press molding machine equipped with a spring unit that elastically presses the lower surface of the block against the horizontal floor surface of the scrap discharge passage by a reaction force accompanying contact with the upper mold side portion Is disclosed.

  Furthermore, Patent Document 3 discloses a movable body that is movable on a horizontal direction passing through a predetermined molding position and a predetermined take-out position by arranging a molding die having a shape matched to the container on the upper surface, A moving body driving mechanism that drives in the direction, a molding mechanism that molds the raw material supplied to the molding die into a container shape on the molding die when the moving body is in the molding position, and the moving body takes out A scraper that has come out from the periphery of the molded material on the molding die when moved to a position is cut to form a container, and a take-out mechanism for taking out the container from the molding die and a moving body are horizontal. A container manufacturing apparatus including a suction removal mechanism that sucks and removes scraps on the moving body while moving in a direction is disclosed.

JP 2000-61566 A JP 2006-321177 A JP 2006-205212 A

  However, as described above, the scrap chute with a reduced friction coefficient and the scrap chute for preventing scrap sticking have a problem that the manufacturing cost and the manufacturing time increase. Further, in the blanking mold, when the mold height, that is, the die height is low, the scrap chute cannot be inclined sufficiently, so that the scrap cannot be discharged reliably.

Also, with a scrap chute that attaches a pressurized air supply source and forcibly slides the scrap,
1. 1. Providing a pressurized air supply source greatly increases costs. 2. Air setting and setup on the equipment side must be done, which takes time for setup each time and increases man-hours. There was a problem that the equipment would be large.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a press molding machine capable of reliably discharging scrap while suppressing cost.

  In order to achieve the above object, the air blowing mechanism of the press molding machine according to the present invention is provided at the opening of the guide bush of the press die, and is connected to the air intake part for taking in the air discharged from the opening and the air intake part. And a pipe for flowing the air taken in from the air intake section to the scrap chute and a discharge port for discharging the air flowing through the pipe onto the scrap chute.

  The air intake part may have a funnel shape that is thinner than the part connected to the opening of the guide bush. Further, the inner surface of the funnel-shaped air intake portion may be provided with a spiral groove.

  The blower mechanism of the press molding machine may include a check valve that shuts off air flowing from the discharge port side to the air intake unit side and a surplus air discharge mechanism in the pipe.

  In the blower mechanism of the press molding machine, the discharge port may be provided at a scrap drop defective portion in the scrap chute.

  In order to achieve the above object, a press molding machine of the present invention is provided at an opening of a guide bush of a press die, and is connected to an air intake portion for taking in air discharged from the opening, and the air intake portion. It has a blower mechanism comprising a pipe for flowing air taken from the intake section to the scrap chute and a discharge port for discharging the air flowing through the pipe onto the scrap chute.

  The press molding machine may have a press die provided with a guide bush and a guide post corresponding to the guide bush. The press mold may include an upper mold and a lower mold, and the guide bush may be provided on the lower mold.

  According to the press molding machine of the present invention, the air discharged from the opening of the press-type guide bush is used, this air is taken in from the air intake portion, and the air taken in from this air intake portion is taken up to the scrap chute by the piping. By flowing the air flowing through the pipe and discharging the air from the discharge port onto the scrap chute, the scrap on the scrap chute is forcibly slid to prevent scrap discharge failure.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing a press molding machine according to an embodiment of the present invention. (A) shows before pressing, (b) shows during pressing, and (c) shows the periphery of the scrap chute during pressing. FIG. 2 is a schematic view showing an air intake portion.

  As shown in FIG. 1, the press molding machine 1 includes a press molding machine main body 2, a press die 34 installed in the press molding machine main body 2, and a blower mechanism 5. The press die 34 includes an upper die 3 and a lower die 4 corresponding to the upper die 3, and these are set in the press molding machine main body 2 with the press surfaces facing each other. When the upper die 3 and the lower die 4 are pressed against each other by pressurization of the press molding machine body 2 with the steel plate sandwiched between the upper die 3 and the lower die 4, the steel plate is pressed. At the same time, scrap is generated.

  The lower mold 4 has a cylindrical guide bush 41, and the upper mold 3 includes a piston-shaped guide post 31 corresponding to the guide bush 41. The guide post 31 slides the guide bush 41 within the guide bush 41 to position the upper die 3 relative to the lower die 4 and guide it to an appropriate sliding track. It is what has been. Since the guide post 31 and the guide bush 41 are in a relationship between the piston and the cylinder, the air in the guide bush 41 is pushed out by the guide post 31 during pressing.

  A blower mechanism 5 is provided in the lower opening 41 a of the guide bush 41 in the lower mold 4. The blower mechanism 5 is installed in close contact so as to cover the opening 41a, and is connected to a funnel-shaped air intake portion 51 for taking in air discharged from the opening 41a, and a lower end of the air intake portion 51, and this air intake portion The piping 52 which flows the air taken in from 51 to the scrap chute 6 and the discharge port 53 which discharges the air which flowed through this piping 52 on the scrap chute 6 are comprised.

  As shown in FIG. 2, the air intake 51 has an opening whose upper end 51 a covers the lower opening 41 a of the guide bush 41, and the lower end 51 b connected to the pipe 52 is the thickness of the pipe 52. It is thin to the extent and has a funnel shape as a whole. A spiral groove 51c is formed on the inner surface of the funnel-shaped air intake 51 as shown in a cross-sectional view in FIG. The funnel-shaped air intake 51 may have a lower end 51b eccentric with respect to the upper end 51a as shown in FIG.

  Here, the air intake portion 51 may not be a funnel shape but may be a box shape or a simple cylindrical shape as shown in FIG. 3A, for example. The inflow of air causes convection of air as shown by an arrow G, which tends to be a reaction force against the press, and the amount of outflow air shown by the arrow F is small. On the other hand, in the case of a funnel shape as shown in FIG. 3 (b), particularly when a spiral groove 51c is provided, an air flow from above as indicated by an arrow E indicates an arrow H. Since such a spiral air flow is generated, the generation of convection is prevented, a reaction force against the press is hardly generated, and the amount of air flowing out, which is indicated by an arrow F, is large.

  As shown in FIG. 4, the pipe 52 includes a check valve 52a, a pressure valve 52b for releasing excess pressure, and a suction valve 52c at a position between the air intake 51 and the discharge port 53. The check valve 52a opens for the air pressure from the air intake 51 to the discharge port 53, and closes for the reverse air pressure. The intake valve 52c is located on the air intake 51 side of the check valve 52a, and is provided on the side wall of the pipe 52. The intake valve 52c opens against the air pressure into the pipe 52 and closes against the reverse air pressure. Due to the functions of the check valve 52a and the suction valve 52c, the guide post 31 slides so as to be pulled out from the guide bush 41 when the upper mold 3 is raised, and flows into the guide bush 41 accordingly. Air can be prevented from flowing in from the discharge port 53. The pressure valve 52b is provided on the side wall of the pipe 52 and is provided so as to exhaust when the atmospheric pressure in the pipe 52 rises above a certain level, that is, open to a certain level of atmospheric pressure outside the pipe 52. Yes. Such a pressure valve 52b is adjusted so that an excessive reaction force is not generated in the pressing process, and the blower mechanism 5 is protected from a predetermined pressure or more.

  The discharge port is provided in the scrap dropping failure portion 6 a of the scrap chute 6. The discharge port 53 may simply have the end of the pipe 52 positioned on the scrap chute 6 or may have a narrowed tip for energizing and ejecting air. Further, the tip of the discharge port 53 may be branched. The discharge port 53 is substantially parallel to the surface of the scrap chute 6 regardless of whether the outlet 53 is directed downward toward the upper surface of the scrap chute 6 or is connected to the hole formed in the scrap chute 6 upward from below. Alternatively, it may be installed downward.

[Operation of press molding machine]
Next, the operation during the pressing process of the press molding machine 1 configured as described above will be described. In the state before the pressing step, as shown in FIG. 1A, a steel plate is placed on the lower mold 4, and the upper mold 3 is located above the lower mold 4 away from the lower mold 4. Further, the guide post 31 is located above the guide bush 41, and air exists in the guide bush 41.

  During the pressing process, the upper die 3 is pressed against the lower die 4 by pressurization of the press molding machine main body 2. As a result, the steel plate is punched or trimmed, and scrap S is generated accordingly. At this time, the guide post 31 slides downward in the guide bush 41, and pushes out the air in the guide bush 41 from the opening 41a by the piston action.

  Then, the air in the guide bush 41 is injected into the air intake portion 51 provided in the lower opening 41a of the guide bush 41. This air is injected into the pipe 52 from the lower end 51 b of the air intake 51. At this time, the air intake portion 51 has a funnel shape as a whole, and a spiral groove 51c is formed on the inner surface, so that it is difficult to generate a reaction force against the pressure of the press. 4 is difficult to prevent pressure contact.

  Air injected into the pipe 52 is discharged from the discharge port 53. The scrap S slides down on the scrap chute 6. Here, when the scrap S stays in the middle of the scrap chute 6 due to friction or sticking, the air ejected from the discharge port 53 is blown onto the scrap S. The scrap S is forcibly biased by the pressure of the air and slides down to the scrap chute 6. At this time, the check valve 52a is in an open state, and the suction valve 52c is in a closed state. Further, when the air pressure in the blower mechanism 5 rises above a certain level, air is discharged from the pressure valve 52b, so that a reaction force against the pressure of the press is hardly generated, and the press contact with the lower mold 4 of the upper mold 3 is hindered. Hateful.

  Thereafter, the upper die 3 is raised, and the guide post 31 slides upward in the guide bush 41. At this time, air flows into the guide bush 41 from the lower opening 41 a of the guide bush 41. At this time, the check valve 52a is closed and the suction valve 52c is opened. Since the air flowing into the guide bush 41 flows from the suction valve 52c, the air can be prevented from flowing from the discharge port 53.

  As described above, according to the press molding machine 1 according to the embodiment of the present invention, even if the scrap S stays in the middle part on the scrap chute 6 due to friction or sticking, the air against the scrap S By forcibly energizing by the pressure, it is possible to promote slipping, preventing so-called discharge failure and press die breakage, and improving productivity.

  In addition, the present invention uses a guide bush and a guide post, which are usually provided for positioning purposes in a press die as an air pressure source, and pays attention to the fact that air flows out by these actions during pressing. Since it is used, it is not necessary to prepare a separate pressure source, and cost saving can be realized. Conventionally, the air flowing out from the guide bush at the time of pressing is only discharged from the injection hole or the air vent hole, and has not been effectively used.

  As a press die of the press molding machine as described above, for example, a guide bush having an inner diameter of 100 mm and a depth of 280 mm was prepared. In this case, the amount of air discharged from the guide bush was 2.2 liters per press, and the maximum air pressure was 1.7 MPa. The cylinder in the pressurized air supply source attached to the scrap chute of the conventional example has an air amount of 0.5 liter in one piston motion and an air pressure of 0.3 MPa. Therefore, sufficient air pressure can be secured to forcibly bias the scrap and prevent stagnation.

  As described above, the press molding machine of the present invention is provided in the opening of the press-type guide bush, and is connected to the air intake section for taking in air discharged from the opening, and is connected to the air intake section. It has a blower mechanism consisting of a pipe that flows the air taken from the inlet to the scrap chute and a discharge port that discharges the air that has flowed through the pipe onto the scrap chute, and does not deviate from its gist It can be implemented in various forms. For example, the press die may not be a part of the press molding machine. Although it is more convenient in operation to provide the guide bush in the lower mold that is normally fixed, the guide bush may be provided in the upper mold. In this case, the same effect as in the case of the embodiment can be obtained by providing a blower mechanism in the upper opening of the guide bush. Although it is desirable that the air intake portion has a funnel shape and a spiral groove is formed on the inner surface, the object of the present invention can be achieved even if it is not in such a form. Moreover, even when a check valve and a surplus air discharge mechanism are not provided in the pipe, the object of the present invention can be achieved. Furthermore, the discharge port can be provided in various modes, such as branching over not only the scrap drop defective portion in the scrap chute but also the entire scrap chute. The press molding machine of the present invention can be used not only for a steel plate but also for a press punching machine for plastic products.

It is a schematic sectional drawing which shows the press molding machine of embodiment of this invention. (A) shows before pressing, (b) shows during pressing, and (c) shows the periphery of the scrap chute during pressing. It is a schematic diagram which shows an air intake part. (A) is a partially transparent perspective view, (b) is a partially transparent side view, and (c) is a DD cross-sectional view of (b). It is a schematic diagram which shows an air intake part. (A) shows a box-shaped air intake part, (b) shows a funnel-shaped air intake part. It is a figure which shows a ventilation mechanism. It is a partial cross section figure which shows a part of conventional press molding machine typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press molding machine 2 Press molding machine main body 3 Upper mold | type 4 Lower mold | type 5 Blower mechanism 6 Scrap chute 6a Falling defective part 34 Press mold | type 31 Guide post 41 Guide bush 41a Opening 51 Air intake part 51a Upper end 51b Lower end 51c Groove 52 Piping 52a Reverse Stop valve 52b Pressure valve 52c Suction valve 53 Discharge port S Scrap

Claims (9)

An air intake that is provided at the opening of the press-type guide bush and takes in the air discharged from the opening;
A pipe connected to the air intake section and flowing the air taken from the air intake section to the scrap chute;
A discharge port for discharging the air flowing through the pipe onto the scrap chute;
A blower mechanism for a press molding machine.   The blower mechanism of the press molding machine according to claim 1, wherein the air intake part has a funnel shape that is thinner than a part connected to the opening of the guide bush.   The blower mechanism of the press molding machine according to claim 1 or 2, wherein a spiral groove is formed on an inner surface of the air intake portion.   The blow mechanism of the press molding machine in any one of Claim 1 to 3 provided with the non-return valve which interrupts | blocks the air which flows into the said piping from the said discharge outlet side to the said air intake part side.   The blower mechanism of a press molding machine according to any one of claims 1 to 4, wherein the piping is provided with a surplus air discharge mechanism.   The blower mechanism of the press molding machine according to any one of claims 1 to 5, wherein the discharge port is provided in a scrap drop failure portion in a scrap chute.   The press molding machine provided with the ventilation mechanism of the press molding machine in any one of Claim 1 to 6.   The press molding machine of Claim 7 which has a press die provided with the guide bush and the guide post corresponding to this guide bush.   The press molding machine according to claim 8, wherein the press die is composed of an upper die and a lower die, and the guide bush is provided on the lower die.