JP2002192252A - Hydroforming die device and hydroforming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydroforming die device and a hydroforming device capable of reducing the costs of a die and facilities and shortening a set-up time. SOLUTION: A hydroforming die device A is provided with a cavity 15 in which a work W is arranged, a die in which insert parts 16 communicating with the cavity are provided in side parts, and shaft press devices 20 which are installed so as to oppose to the insert parts of this die and in which pressure liquid passages are provided inside part and seal parts to the work inside of the die and shaft pressure parts of the work are provided. A hydroforming die device B is provided with this hydroforming die device, a press device which clamps the die of this hydroforming die device, and a shaft press cylinder device 40 which is closely arranged to the hydroforming die device and shaft-presses a shaft press part of a shaft press rod device toward the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydroforming die apparatus used for plastic forming of a metal tube called hydroforming or hydraulic bulging, and a hydroforming apparatus using the same.

[0002]

2. Description of the Related Art For example, bulge forming of a metal pipe such as a T-shaped pipe used for an exhaust manifold of an automobile is disclosed in Japanese Patent Application Laid-Open No. 2000-117341. Conventionally, a standard bulge forming machine includes, as shown in FIG. 7, a mold 1 provided with a cavity in which a workpiece to be subjected to plastic working is arranged, and a press for clamping the mold 1.
(Hydraulic press) 2 and an axial force cylinder 3 for pressing a workpiece in the mold 1.

The axial force cylinder 3 has a function of adjusting the longitudinal direction and the horizontal turning direction according to the shape of the product to be processed.
However, the mechanism for adjusting the vertical and vertical angles and the vertical angle does not have this mechanism because the structure becomes complicated, which leads to an increase in equipment cost and deterioration in usability.

For this reason, like the structure of the standard mold 1 shown in FIG. 8, a horizontal extra portion 4 is provided in the horizontal direction which is unnecessary as a product to match the movement of the axial force cylinder 3. As a means for solving such a problem, conventionally, as shown in FIGS.
There is proposed a device to be installed in the system. Axial force cylinder 3A
Is provided with a rod-shaped shaft pushing portion 7 and is fixed to the flange portions 1A1 and 1A2 of the mold 1A via the cylinder bracket 5.

[0005] The shaft pushing portion 7 has a pressure liquid passage 8 therein and a step portion 9 at its tip end for pushing the end of the workpiece in the mold 1A. According to this device, for example, as shown in FIG. 11, by attaching the angle adjusting plate 6 to the cylinder bracket 5, the position and angle of the axial force cylinder 3A can be set as a guide, and the setup of the axial force cylinder 3A There is an advantage that adjustment work can be eliminated.

Further, as shown in FIG. 9, a portion P (for example, in the left-right direction of the press) occupied by an axial force cylinder.
In FIG. 7, a space is formed in the area where the axial force cylinder 3 is installed, and an accompanying effect that the die changing apparatus can be installed in this area can be expected.

[0007]

[0009] However, FIGS.
In the apparatus shown in FIG. 1, an axial cylinder 3A must be provided for each mold 1A. Further, it is necessary to provide a cylinder bracket 5 having a rigidity corresponding to the reaction force of the axial force cylinder 3A for each mold 1A.

As a result, there are the following problems. 1) Increased mold cost 2) Increased mold size and correspondingly increased machine size (increased equipment cost) 3) Occurrence of desorption work of internal pressure piping, hydraulic piping, electric wiring, etc. during mold replacement (setup time) SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a mold apparatus and a hydroforming apparatus for hydroforming that can reduce the cost of a mold and equipment and can shorten the setup time. It is to provide a device.

[0009]

According to the first aspect of the present invention,
A mold provided with a cavity for disposing the workpiece and having an insert portion connected to the cavity on the side, and a mold and a pressurized liquid conducting path provided inside the mold and installed opposite to the insert of the mold. The present invention is characterized in that a seal portion with a workpiece in a mold and a shaft pushing device provided with a shaft pushing portion of the workpiece are provided.

According to a second aspect of the present invention, in the mold device for hydroforming according to the first aspect, the shaft pushing device includes a bracket provided on the mold, and a pressure fluid communication path provided inside the bracket. A shaft pushing rod movably provided on a bracket, wherein the shaft pushing rod has an axial pushing portion that abuts an end of the workpiece, and a seal portion provided adjacent to the axial pushing portion. And a pressed portion provided opposite to the shaft pressing portion.

According to a third aspect of the present invention, in the hydroforming die apparatus according to the second aspect, the shaft pushing device includes an angle adjusting member in the pressed portion. The invention according to claim 4 is a mold device for hydroforming according to any one of claims 1 to 3, a press device for clamping the mold device for hydroforming, and the mold device for hydroforming. A shaft pushing cylinder device which is arranged adjacent to the mold device and which pushes the shaft pushing portion of the shaft pushing rod device toward the workpiece.

According to a fifth aspect of the present invention, in the hydroforming apparatus according to the fourth aspect, the axle pushing cylinder device is provided on a bracket provided on a facility for installing the hydroforming die device, and is provided on the bracket. A hydraulic cylinder, a pressing member provided on the hydraulic cylinder, and pressing a shaft pressing portion of the shaft pressing device;
And a guide provided on the pressing member to guide the pressing member movably through the bracket.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments shown in the drawings. 1 to 3 show a hydroforming apparatus B using a hydroforming die apparatus A according to a first embodiment of the present invention (corresponding to claim 1, claim 2, claim 4, or claim 5). ). This embodiment is applied to the case where a product having a step in the vertical direction of the mold 10 is processed.

First, the hydroforming die apparatus A according to the present embodiment will be described. The hydroforming die apparatus A includes a die 10 and a shaft pushing device 20 having a function of sealing the workpiece W in the mold 10 and a function of pushing the workpiece W. The mold 10 includes an upper mold 11 having a flange 12 and a lower mold 13 having a flange 14.

The upper mold 11 and the lower mold 13 form a cavity 15 having a desired shape by molding surfaces engraved on the respective inner surfaces. The cavity 15 is provided continuously with an insert portion 16 that opens on the side of the mold 10. Then, as in the conventional case, the mold 10 fixes the upper mold 11 to a mold clamping press (hydraulic press) 17 via the flange 12 and fixes the lower mold 13 to the mechanical bolster 18 via the flange 14. It is installed by doing.

The shaft pushing device 20 is positioned at a position facing the insert 16 of the mold 10 so that the axis 16 of the insert 16 is
L is fixed on the flange portion 14 of the mold 10 by aligning the axis 20L of the shaft pushing rod 25 with L. Axial pushing device 20
As shown in FIGS. 1 to 3, the flange portion 1 of the mold 10
The bracket 21 includes an L-shaped bracket 21 fixed on the bracket 4 and a shaft pushing rod 25 movably attached to the bracket 21. The shaft pushing rod 25 has a pressure liquid passage 26 therein.

The bracket 21 has a hole 2 for mounting a guide bush 24 through which a shaft pushing rod 25 is movably inserted.
2 and a retainer bolt 32 for fixing the shaft pushing rod 25
And a hole 23 for attaching the same. Axial rod 25
It comprises a rod-shaped insertion portion 27 fitted into the end of the workpiece W in the mold 10, and a disk-shaped base 30 connected to the insertion portion 27.

The insertion portion 27 has a stepped portion (a shaft pushing portion) 28 in contact with the tip end portion W1 of the workpiece W, an annular concave portion 29 provided near the stepped portion 28, and a mounting portion in the annular concave portion 29. And an O-ring 36. The O-ring 36 is used to secure a seal between the insertion portion 27 and the workpiece W. The annular concave portion 29 and the O-ring 36 form a seal portion.

The base 30 has a stepped hole 31 through which a retainer bolt 32 is inserted, and an opening 33 through which the pressure liquid passage 26 communicates with a pressure source. On the back side of the base 30, a wear plate 34 made of a disk is attached to form a pressed portion. The retainer bolt 32 is inserted from the back surface of the base 30 toward the bracket 21 through the stepped hole 31 by disposing a spring 35 between the bracket 21 and the base 30, and a screw portion is inserted into the hole 23 of the bracket 21. Can be screwed.

The depth of the large diameter portion 31a of the stepped hole 31 for fixing the head 32a of the retainer bolt 32 secures the stroke S of the shaft pushing rod 25 pressed by the shaft pushing cylinder device 40 as described later. It is set to be longer than it can.

According to the thus-configured hydroforming die apparatus A according to the present embodiment, the shaft pushing device 20 aligns the two axes 20L, 16L with the insert portion 16 of the die 10. Because they are arranged facing each other,
When the shaft pushing device 20 receives a pressing force in the direction of the mold 10 by a cylinder or the like, the shaft pushing rod 25 is guided by the two retainer bolts 32 while being regulated by the spring 35 arranged on the two retainer bolts 32. The guide bush 24 slides and advances in the direction orthogonal to the bracket 21, and the insertion portion 27 is inserted into the end of the workpiece W in the mold 10, and the workpiece 28 is inserted into the step portion 28 of the insertion portion 27. The O-ring 36 can be pressed against the inner surface of the end of the workpiece W while contacting the tip W1 of the W.

The axial pushing stroke of the insertion portion 27 is set equal to the stroke S of the stepped hole 31 of the base 30, so that axial pushing by hydroforming can be sufficiently ensured. In addition, the insertion portion 27
Since it is possible to communicate with the pressure source via the pressure liquid passage 26, it is possible to introduce the pressure liquid necessary for hydroforming into the workpiece W from the tip.

As described above, in the die apparatus A for hydroforming according to the present embodiment, the device manufactured for each die 10 is only the shaft pushing device 20, and it is necessary to provide a conventional axial force cylinder. lost. As a result, the hydroforming die apparatus A can be installed or removed without performing the work of attaching and detaching the hydraulic cylinder piping and the electric wiring.

Next, an apparatus B for hydroforming using the mold apparatus A for hydroforming will be described. In the present embodiment, only one of the axial pushing cylinder devices 40 arranged on both sides of the mold 10 is shown, and the other is omitted. Molding device A for hydroforming
Are fixed on a mechanical bolster 18 according to a standard method.

Then, as in the conventional case, the upper die 11 is fixed to a mold clamping press (hydraulic press) 17 via a flange 12, and the flange 1 is mounted on a mechanical bolster 18.
It is installed by fixing the lower mold 13 via 4. In addition, a shaft pushing cylinder device 40 that pushes the shaft pushing device 20 toward the workpiece W around the hydroforming die device A is installed.

The shaft pushing cylinder device 40 includes a bracket 41 mounted on a floor 50, a hydraulic cylinder 44 movably mounted on the bracket 41, and a shaft pushing mounted on the hydraulic cylinder 44 via a wear plate 34. It comprises a pressing member 46 for pressing the rod 25 in the axial direction, and two guide rods 48 attached to the pressing member 43 and penetrating the bracket 41 to guide the pressing member 46 movably.

The bracket 41 has a fixed portion 42 for inserting and supporting the hydraulic cylinder 44 and two guide rods 48.
And a bearing part 43 for supporting by passing through. The hydraulic cylinder 44 is installed so that the rod 45 can be protruded and retracted in parallel with the axis of the shaft pushing rod 25. Pressing member 46
Is formed of a disk having a diameter larger than that of the base 30 of the shaft pushing rod 25, and a wear plate 47 is provided on the front side in contact with the wear plate 34 provided on the shaft pushing rod 25.

The pressing member 46 is connected to the hydraulic cylinder 4
4 is mounted perpendicular to the rod 45 of the hydraulic cylinder 44 so as to move in the same direction as the moving direction of the rod 45. A pressure source (not shown) necessary for hydroforming is installed in the same manner as in the related art.

Next, the operation of the hydroforming apparatus B using the thus formed hydroforming mold apparatus A according to the present embodiment will be described. First, FIG.
The workpiece W is placed in the mold 10 and the mold 10 is clamped by the mold press 17 as shown in FIG. Next, FIG.
, The hydraulic cylinder 4 of the hydraulic cylinder device 40
4 is driven to advance the rod 45, the pressing member 46
Moves forward while its position is regulated by the two guide rods 48, and the wear plate 47 of the pressing member 46 is
The contact with the wear plate 34 on the 0 side and the rod 45
Is advanced, the axial pushing rod 25 is pushed out toward the mold 10.

Then, the insertion part 27 of the shaft pushing rod 25 is fitted into the insert part 16 of the mold 10, and the tip part W 1 of the workpiece W is brought into contact with the step part 28. Thus, the insertion portion 27 of the shaft pushing rod 25 can perform a sealing function when a pressure liquid is loaded by the O-ring 36. In this state, the pressure liquid is supplied from the pressure source to the pressure liquid passage 26.
Through the workpiece W. Then, the front end W1 of the workpiece W is pressed into the mold 10 by the hydraulic cylinder 44 via the step 28 of the shaft pushing rod 25, and the cavity 15 is pressed.
Then, the workpiece W is moved to the side where the enlarged portion of the workpiece W is formed, and plastic working by hydroforming to prevent the workpiece W from bursting is reliably performed.

When the molding is completed, the hydraulic cylinder 44 is retracted. Along with this, the axial pushing rod 25 also has the spring 3
5 to start the retreat and return to the initial state shown in FIG. As described above, according to the present embodiment, the shaft pushing mechanism in the hydroforming device is replaced with the shaft pushing device 20.
And a shaft pushing cylinder device 40 serving as a driving source, the following advantages are obtained as compared with a conventional shaft pushing mechanism in which a mold is integrated.

1) Since the hydraulic cylinder required for each mold can be provided on the equipment side, mold costs can be reduced. 2) Since the holding rigidity of the shaft pushing mechanism attached to the mold can be reduced, the mold can be made compact and inexpensive.
In addition, the size of the machine can be reduced, and equipment costs can be reduced.

3) Wiring and piping setup of the hydraulic cylinder can be eliminated, and setup time can be shortened. FIG. 4 shows a hydroforming device B1 using a hydroforming die device A1 according to a second embodiment of the present invention (corresponding to all claims). In FIG. 4, the mold clamping press 17 and the mechanical bolster 18 are omitted. Also,
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the insert portion 16A of the hydroforming die apparatus A1 is open at an angle α in the plane direction with respect to the axis 10L of the die 10A. Therefore, the shaft pushing device 20A is also installed at an angle α in order to secure an axis 20L coinciding with the axis 16L of the insert 16A.

On the other hand, the shaft pushing cylinder device 40 is
It has the same configuration as the above embodiment. Therefore, an inclined wear plate 37 is attached to the base 30 of the shaft pushing rod 25 as an angle adjusting member for matching the axis 20L of the shaft pushing device 20A with the axis 40L of the shaft pushing cylinder device 40.

In this embodiment, the shaft pushing cylinder device 40
When the rod 45 of the hydraulic cylinder 44 is advanced, the wear plate 47 of the pressing member 46 comes into contact with the inclined wear plate 37 on the axial pushing rod 25A side, and when the rod 45 of the hydraulic cylinder 44 is further advanced, The wear plate 37 advances while sliding on the wear plate 47.

Thus, similarly to the above-described embodiment, the insertion portion 27A of the shaft pushing rod 25A is inserted into the insert portion 16A of the mold 10A, and the molded product W in the mold 10A is plastically formed by hydroforming. Processing can be performed.

FIG. 5 shows a hydroforming apparatus B2 using a hydroforming mold apparatus A2 according to a third embodiment of the present invention (corresponding to all claims). In FIG. 5, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, the insert portion 16B of the hydroforming die apparatus A2 is open with an angle β in the vertical direction with respect to the axis 10L of the die 10B.

Therefore, the shaft pushing device 20B is installed on the bracket 21B at the same angle β in order to secure an axis 20L coinciding with the axis 16L of the insert portion 16B. On the other hand, the shaft pushing cylinder device 40
Has the same configuration as the above embodiment.

Therefore, an inclined wear plate 38 is attached to the base 30 of the shaft pushing rod 25 as an angle adjusting member for matching the axis 20L of the shaft pushing device 20B with the axis 40L of the shaft pushing cylinder device 40. In this embodiment,
When the axial pushing cylinder device 40 is driven to advance the rod 45 of the hydraulic cylinder 44, the wear plate 47 of the pressing member 46 is moved to the inclined wear plate 3 on the axial pushing rod 25 side.
8, when the rod 45 of the hydraulic cylinder 44 is further advanced, the inclined wear plate 38 advances while sliding on the wear plate 47.

Thus, similarly to the above-described embodiments, the insertion portion 27B of the shaft pushing rod 25B is inserted into the insert portion 16B of the mold 10B, and the molded product W in the mold 10B is subjected to hydroforming. Plastic working can be performed. FIG. 6 shows a mold device for hydroforming according to a fourth embodiment of the present invention (corresponding to all claims). FIG. 6 shows only the shaft pushing device 20C.

In this embodiment, an example is shown in which a roller unit 39 is used in place of the inclined wear plate. The roller unit 39 applies the axial pushing force of the axial pushing cylinder device 40 similarly to the inclined wear plates 36 and 37 to the axial pushing rod 25C.
Therefore, the same operation as the embodiment shown in FIGS. 4 and 5 can be achieved.

The rollers of the roller unit 39 are 1
The number is not limited to the number but may be plural. Also, the roller unit 39
Instead, a needle bearing may be used. Further, in each embodiment, the case where two insert portions 16, 15A, 15B are provided in the molds 10, 10A, 10B has been described. However, since the number of insert portions differs depending on the shape of the workpiece W, the installation thereof is performed. The number is arbitrary.

Further, in each of the embodiments, the case where the axial pushing cylinder device 40 is installed on the floor 50 outside the die area has been described. However, the axial pushing cylinder device 40 is an axial pushing device of a hydroforming die device. 20, 20A,
The cylinder device is not limited to this as long as it can press the rods of 20B and 20C, and may be, for example, a cylinder device that hangs from the ceiling outside the die area.

[0045]

As described above, according to the present invention, the shaft pushing mechanism is separated into the cylinder device of the drive source and the shaft pushing device for directly pushing out the workpiece, and the shaft pushing device is provided in the mold. As a result, the only part to be manufactured for each mold is the axle pushing device, which makes it possible to reduce the cost of the mold, reduce the size of the mold, and eliminate the work of attaching and detaching the hydraulic cylinder piping and electric wiring.

[Brief description of the drawings]

FIG. 1 shows a hydroforming apparatus B using a hydroforming mold apparatus A according to a first embodiment of the present invention.
FIG.

FIG. 2A is a cross-sectional view showing a shaft pushing device of the mold device A for hydroforming in FIG. (B) Molding apparatus A for hydroforming in FIG.
It is a rear view which shows the axial pushing rod of the axial pushing device of FIG.

FIG. 3 is a partially cutaway side view showing a state at the time of processing by a hydroforming apparatus B using the die apparatus A for hydroforming according to the first embodiment shown in FIG. 1;

FIG. 4 is a partially cutaway plan view showing a hydroforming device B1 using a hydroforming die device A1 according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway side view showing a hydroforming apparatus B2 using a hydroforming mold apparatus A2 according to a third embodiment of the present invention.

FIG. 6 (a) is a cross-sectional view of a shaft pushing device 20C in a hydroforming device using a hydroforming die device according to a fourth embodiment of the present invention. (B) It is a rear view which shows the axial pushing device 20C in (a).

FIG. 7 is a front view showing a conventional bulge forming machine.

FIG. 8 is a front view showing a mold part in the bulge forming machine of FIG. 7;

FIG. 9 is a front view showing a conventional bulge forming machine.

FIG. 10 is a front view showing a mold part in the bulge forming machine of FIG. 9;

FIG. 11 is a sectional view of the bulge forming machine of FIG. 9;

[Explanation of symbols]

 A, A1, A2 Hydroforming die apparatus B, B1, B2 Hydroforming apparatus W Workpiece 10, 10A, 10B Die 15 Cavity 16, 16A, 16B Insert part 17 Molding press 18 Mechanical bolster 20, 20A 20B, 20C Axial pushing device 21 Bracket 25, 25A Axial pushing rod 26 Pressure liquid conduction path 28 Step (axial pushing portion) 34 Wear plate (pressed portion) 26 O-ring (seal portion) 37, 38 Inclined wear plate (angle) Adjusting member) 39 Roller unit (angle adjusting member) 40 Shaft pushing cylinder device 41 Bracket 44 Hydraulic cylinder 46 Pressing member 48 Guide rod

Claims (5)

[Claims] 1. A mold provided with a cavity in which a workpiece is provided and having an insert portion connected to the cavity on a side portion, and a pressure liquid guide installed inside the mold so as to face the insert portion of the mold. A mold device for hydroforming, comprising: a passage portion, a seal portion with a workpiece in the mold, and a shaft pushing device provided with a shaft pushing portion of the workpiece. 2. The mold device for hydroforming according to claim 1, wherein the shaft pushing device is provided with a bracket provided on the mold, and a pressure liquid communication path provided inside, and movably provided on the bracket. A shaft pushing rod, wherein the shaft pushing rod abuts an end of the workpiece, a seal portion provided adjacent to the shaft pushing portion, and the shaft pushing portion. A mold device for hydroforming, comprising: a pressed portion provided to face the same. 3. The hydroforming die apparatus according to claim 2, wherein the shaft pushing device includes an angle adjusting member in the pressed portion. 4. The hydroforming die device according to claim 1, a press device for clamping the hydroforming die device, and a hydroforming die device. Adjacent,
A hydroforming device, comprising: a shaft pushing cylinder device for axially pushing a shaft pushing portion of the shaft pushing rod device toward the workpiece. 5. The hydroforming device according to claim 4, wherein the axial pushing cylinder device includes: a bracket provided on a facility for installing the hydroforming die device; and a hydraulic cylinder provided on the bracket. A pressing member provided on the hydraulic cylinder and pressing the shaft pressing portion of the shaft pressing device; and a guide provided on the pressing member and penetrating the bracket to guide the pressing member movably. Characterized hydroforming equipment.