JPH0829368B2 - Bulge forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a structure capable of applying pressure such as water pressure to the outer periphery of a divided mold, and an upper / lower core of the apparatus main body and both end frame portions. The present invention relates to a structure that keeps constant at all times, and in particular, relates to a bulge forming apparatus that completely prevents the split mold from opening during molding and is suitable for a highly accurate centering mechanism.

[Conventional technology]

In "Mechanics of Materials" by Kai Terazawa and Matsuura (Kaibundo), see page 274.
The page shows a method of applying pressure to the gap between the outer cylinder and the inner cylinder as a method of reinforcing the cylinder, but does not mention the method of restraining the divided molds. Further, in the conventional bulge forming apparatus, as shown in Japanese Patent Laid-Open No. 58-23605, the split mold is restrained from opening from above by a cylinder or the like, and the lower part of the mold is also used as a centering method. We support, with high precision,
Moreover, no reproducible centering method is mentioned.

[Problems to be solved by the invention]

As described in JP-A-58-23605, conventionally, in a bulge forming apparatus, a divided die is covered with a dividing jig having an arbitrary taper on the outer periphery, and the taper portion has an integral ring shape. By pressing the restraint ring, the opening of the mold during the bulge forming was restrained by the taper portion. Further, the divided molds are directly restrained by bolts or cylinders.

In addition, there is an example of an axial force applying device that applies an axial force to the material inside the split mold, but there are cases in which the frames provided at both ends receive the reaction force, but the frame is fixed to the body and left / right, up / down. The main body did not move, and bulge molding was always performed at the same position.

In this prior art, due to the elastic deformation of the bolt, the elastic deformation of the taper portion, or the processing tolerance of the contact taper portion, the split mold is opened by the amount of the deformation. Therefore, the material is molded larger than the predetermined size, the dimensional accuracy is poor,
Dimensional reproducibility was not obtained. Further, if a large number of cylinders or restraint rings are used for restraint, it is considered to be good for forming a relatively small material, but there is a problem that the restraint cannot be achieved when the material becomes large.

An object of the present invention is to provide a bulge forming device capable of preventing the split mold from completely opening, and further capable of always keeping the upper and lower cores of the main body and the frame portions at both ends constant. .

[Means for solving problems]

The above-mentioned object is to make an upper mold which contacts a tubular material from above and molds the material, a lower part which comes into contact with the material from below and has a sealing means on the surface facing the upper mold, and a plurality of rollers at the bottom. A die, an outer cylinder provided with positioning means for covering the outer peripheries of these two dies so as to form a gap between these dies and positioning the lower die in the vertical direction, and the outer cylinder through the outer cylinder A main body portion that is connected to an upper die and has a first drive means that can move the upper die in the vertical direction, a fixing means that fixes the outer cylinder at an outer peripheral surface at a central axis height, and the fixing. A trolley provided with a supporting means for supporting the fixing means so as to enable the horizontal movement of the means, a first sealing means which is watertightly inserted into the material from both axial sides thereof, In the mold and the outer cylinder, Second sealing means for engaging the gap in a watertight manner from the side, second driving means for moving the first and second sealing means in the axial direction, and the main body portion in the axial direction. A pair of frames, which are provided on both sides of the frame so as to sandwich the frame, to which the second drive means are fixed, respectively, a tie bar which holds the axial gap between the pair of frames, and the frame which is the outer cylinder. And a support base that is supported on the outer surface at the center axis height.

[Action]

According to the present invention, both dies are clamped by applying pressure such as water pressure to the gap between the dies and the outer cylinder. Therefore, by applying pressure to the gap so that the pressure applied to the inside of the tubular material at the time of bulge molding tightens both molds with a force stronger than the force to open both molds, both pressures are lower than the bulge molding pressure. The mold can be restrained.

Also, when pressure is applied to the gap between the mold and the outer cylinder during bulge molding, the outer cylinder undergoes elastic deformation in the radial direction, but the support means moves the fixing means of the outer cylinder in the horizontal direction to prevent this deformation. Since it can be absorbed, the vertical core of the main body can be always held constant.

Further, even if the reaction force against the sealing force for sealing the first and second sealing means acts on the frame to deform the frame in the axial direction, the support base moves the frame at the height of the central axis of the outer cylinder. Since it is supported on the outer side surface, the vertical core of the frame can always be held constant.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1, FIG. 2, FIG.
This will be described with reference to FIG.

The outer peripheries of the divided upper mold 4 and lower mold 5 are covered with an integral outer cylinder 3 having an arbitrary gear, and the upper mold 4 and lower mold 5 are divided into two parts, and the lower mold 5 is slanted. A roller 19 having a spring 20 provided at the lower part can move the circular surface of the integral outer cylinder 3, and a packing pad 24 for sealing is provided at the upper part of the dividing surface, while the upper mold 4 is vertically moved by the cylinder 17. It is connected to the tip of the cylinder 17 so that it can be opened and closed. Next, after the material 6 is inserted and the setting is completed, the upper die 4 is pressed by the cylinder 17 and brought into contact with the lower die 5, and then the spring 20 is bent so that the upper die 4 and the lower die 5 are Body external cylinder 3
The mold is set by continuously pushing with the cylinder 17 until it comes into contact with the tip of the positioning pin 18 attached to the lower part of the, and fixing means 23 are provided on the left and right outer surfaces of the center of the integral outer cylinder 3, and the lower surface thereof. A main body supported by a trolley 9 having wheels 10, an upper mold 4, a lower mold 5 and both ends of an integral outer cylinder 3 provided on the outer periphery of the main mold 4, and a sealing O-ring 15 and a packing 16 are provided. By pressing with the cylinder 13 via the face plate 8, an arbitrary gear is sealed, and the pressure rod 7 is inserted into the material 6 from both ends via the sealing O-rings 14 by the cylinders 12 to apply an axial force. In a bulge forming device consisting of both-end frame parts that receive reaction force by four tie bars 1 connected between frames 2 provided at both ends of the main part, the main body part is a block whose height can be adjusted upward and downward. twenty five
Place the rail 11 on top and adjust the height. Further, as shown in FIG. 4, since the frame 2 of the both end frame portions is bent and deformed, both side surfaces at the center position of the reaction force are supported by the support bases 21 so that the core is aligned with the main body portion. , The upper and lower cores of the main body and the frame parts on both ends are determined.

Next, the axial center of the main body is determined by the positioning damper 22 following the axial center of the frame parts on both ends. By this operation, the upper, lower, and axial cores of the main body and the frame portions at both ends are determined, and even if the main body moves by the carriage 9, the integral outer cylinder 3 is elastically deformed in the radial direction during bulging. But always,
Upward / downward and axial cores are held constant.

After this operation is completed, bulge forming is performed. According to the present embodiment, when a pressure such as water pressure is applied from the inlet of the face plate 8 to an arbitrary set pressure on any gear of the upper die 4, the lower die 5 and the integral outer cylinder 3, the upper die 4 is pressed. , The lower die 5 is tightened, and the upper die 4, due to the pressure in the material 6 during the bulge forming,
The opening of the lower mold 5 can be completely restrained, and the dimensional accuracy of the material 6 after molding becomes very high. Further, the core in the up / down direction and the axial direction can be held constant during bulge molding and during movement of the main body.

〔The invention's effect〕

According to the present invention, it is possible to completely restrain the opening of the split mold with a pressure lower than the molding pressure in bulge molding. Further, even when the integral outer cylinder of the main body portion is deformed and the frame portions of both end frame portions are bent and deformed during the bulge molding, the same core can be always held.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a main body portion at the time of setting, and FIG. 3 is a sectional view taken along line III-III of FIG.
A sectional view and FIG. 4 are front views of the frame. 1 ... tie bar, 2 ... frame, 3 ... integrated outer cylinder, 4 ... upper mold, 5 ... lower mold, 6 ... material.

Claims (1)

[Claims] 1. An upper mold for contacting a tubular material from above to form the material, an upper mold for contacting the material from below, and a sealing means on a surface facing the upper mold, and a plurality of rollers at a lower part. A lower mold, an outer cylinder having a positioning means for covering the outer peripheries of these molds so as to form a gap between these molds and positioning the lower mold in the vertical direction, and through the outer cylinder A main body portion having a first driving means connected to the upper mold and capable of moving the upper mold in a vertical direction; a fixing means for fixing the outer cylinder at an outer peripheral surface at a central axis height thereof; A trolley provided with a supporting means for supporting the fixing means so that the fixing means can move in the horizontal direction; a first sealing means which is watertightly inserted into the material from both axial sides thereof; Axial direction on both molds and the outer cylinder Second sealing means for watertightly engaging the gap from both sides; second driving means for moving the first and second sealing means in the axial direction; and the main body portion in the axial direction. It is provided on both sides so as to be sandwiched, and the second drive means is fixed to each of them 1.
A pair of frames, a tie bar that holds the axial distance between the pair of frames, and a support base that supports the frames on an outer surface at the center axis height of the outer cylinder. Bulge forming device.