JPS63174730A - Bulge forming device - Google Patents

Abstract

PURPOSE:To prevent the opening of a split die due to a bulge forming pressure by covering the outer periphery of a lower die and upper die with the outer cylinder having a gap, pressing the end face of a die and outer cylinder by a face body and cylinder from both ends and applying a water pressure, etc., on a hermetically sealed gap. CONSTITUTION:The outer periphery of splitted upper and lower dies 4, 5 is covered by the integrated outer cylinder 3 having a gap and the right and left outer surface at the center of the outer cylinder is supported by the fixing jig 23 brought into contact with a truck to absorb the elastic deformation of the outer cylinder. The right and left side faces of the center of both ends frames 2 of the tie bar receiving the reaction force of the axial force applied on the blank inside the split die and the end face sealing force is supported by a supporting base 21. The core in the upper and lower directions of the frame is constantly held even is the plane bending deformation of the frame is caused. The opening of the split die is completely constrained with the water pressure lower than the forming pressure in bulge forming and the same core can be held even if the bending deformation of the frame of both ends frame part and the deformation of the outer cylinder at bulge forming time are caused.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a structure that can apply pressure such as water pressure to the outer periphery of a divided mold, and a structure in which the upper and lower cores of the device main body and both end frame parts are connected. The present invention relates to a structure that is always constant, and particularly 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” (Kaibundo) co-authored by Terasawa and Matsuura, 22
Page 74 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 a method of restraining the divided molds.

In addition, the conventional bulge forming device is
As shown in Publication No. 5, the split mold is restrained from opening by a cylinder etc. from the top, and the bottom of the mold is supported as a centering method, resulting in high precision and reproducibility. There is no mention of a certain centering method.

[Problem that the invention seeks to solve]

Conventionally, as described in Japanese Unexamined Patent Publication No. 58-23605.

Bulge forming equipment covers a divided mold with a dividing jig that has an arbitrary taper on the outer periphery, and presses an integral ring-shaped restraining ring on the tapered part to taper the opening of the mold during bulge forming. He was detained at the department. In addition, the divided molds are directly restrained by bolts or the like or by cylinders or the like.

In addition, there are examples of axial force adding devices that apply axial force to the material in split molds, which receive reaction force from frames installed at both ends, but the frames are fixed to the left, right, top, and bottom of the main body. The main body did not move and bulge forming was always performed in the same position.

In this prior art, due to elastic deformation of the bolt, elastic deformation of the tapered portion, or machining tolerance of the contact taper portion, an opening corresponding to the amount of deformation occurs in the split mold. Therefore, the material was molded to be larger than the predetermined dimensions, resulting in poor dimensional accuracy and poor dimensional reproducibility. Further, restraining by attaching a large number of cylinders or restraining rings is considered to be effective for molding relatively small materials, but there is a problem that it becomes impossible to fully restrain the materials when the materials become large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bulge forming apparatus that can completely prevent the split mold from opening and further maintain the upper and lower cores of one main body part and both end frame parts constant at all times. .

[Means for solving problems]

The above purpose is to cover the outer periphery of the mold, which is a combination of a lower mold equipped with a roller with a spring and an upper mold, with an integrated outer cylinder with an arbitrary gap, and after positioning the upper and lower parts, from both ends. By pressing the end faces of the split mold and the integrated outer cylinder with a cylinder or the like through the face piece, and applying pressure such as water pressure to the sealed gap, the force of trying to open the split mold due to the pressure of bulge forming is suppressed. This is achieved by increasing the pressure to such a degree that it becomes a large restraining force.

Furthermore, when this pressure is applied, the stress increases in the integrated outer cylinder due to the pressure, causing it to elastically deform in the radial direction. Supports the left and right outer surfaces of the center of the integrated outer cylinder.

By absorbing the elastic deformation of the integrated outer cylinder by sliding it in the left-right direction on the contact surface with the trolley, the center of the main body in the upward and downward directions is always maintained constant. Furthermore, by supporting the left and right sides of the center of the frame provided at both ends of the tie bar, which receives the reaction force from the axial force applied to the material in the split mold and the end face sealing force, the frame is Even if plane bending deformation occurs, the vertical axis of the frame is always maintained constant and the objective is achieved.

[Effect]

By applying pressure such as water pressure to any sealed gap between the split mold and the integral outer cylinder provided on its outer periphery,
The upper, indivisible mold is tightened.

If pressure is applied to an arbitrary gap so that the force is higher than the force that tries to open the split mold caused by the pressure added to the inside of the material set in the mold during bulge molding, the pressure will be higher than the bulge molding pressure. The mold can be restrained with lower pressure.

Furthermore, when pressure such as water pressure is applied to any gap by bulge forming, elastic deformation occurs in the radial direction of the integral outer cylinder. It supports the left and right outer surfaces of the center of the integrated outer cylinder and absorbs elastic deformation by sliding it in the left and right directions at the contact part with the trolley, and the frames installed at both ends of the main body also bend when 1 reaction force is applied. By supporting the left and right sides of the center of the frame, it is possible to always maintain a constant centering in the upward and downward directions.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.

The outer periphery of the divided upper and lower molds 4 and 5 is covered with an integral outer cylinder 3 with an arbitrary gap, and the upper and lower molds 4 and 5 are divided into two parts.
The lower mold 5 can move the circular surface of the integral outer cylinder 3 with a roller 19 having a spring 20 provided diagonally at the lower part, and a sealing gasket 24 is provided on the upper part of the one-part surface.
is provided with a spigot groove in the upper part so that it can be opened and closed in the upward and downward directions by the cylinder 17, and after inserting the material 6 and completing the setting, the cylinder 17 presses the upper mold 4 and brings it into contact with the lower mold 5, and then the spring 20 The molds are set by bending the upper and lower molds 4.5 by continuing to press them with the cylinder 17 until they come into contact with the tips of the positioning pins 18 attached to the lower part of the integral outer cylinder 3. A fixing jig 23 is provided on the left and right outer surfaces of the center of the outer cylinder 3, and a main body part whose lower surface is supported by a trolley 9 having wheels 10, and an integral outer part provided on the outer periphery of the upper and lower molds 4 and 5 are provided. Seal O-ring 1 from both ends of cylinder 3
5. Cylinder 13 via face plate 8 with packing 16
Press the pressure rod 7 from both ends with the cylinder 12 to seal any gap.
A bulge forming device that is inserted into a material 6 through a ring 14 and has a frame section at both ends that receives the reaction force that adds an axial force with four tie bars 1 tied between frames 2 provided at both ends of a main body section. The height of the main body part 1 is adjusted by placing the rail 11 on a block 25 whose height can be adjusted upward and downward.Furthermore, the frame 2 of the frame parts at both ends is bent once as shown in Fig. 4. Since deformation occurs, by supporting both sides of the center of the reaction force with support stands 21 and aligning the center with the main body, the vertical center of the main body and both end frame parts is determined.

Next, the axial center of the main body section is determined by the positioning damper 22 following the axial center of the frame section at both ends. This operation determines the upper, lower, and axial centers of the 1 main body and both end frame parts, and even if the main body moves on the trolley 9, the integral outer cylinder 3 is elastically deformed in the radial direction during bulge forming. However, always
vertical direction.

The axial center is held constant.

After completing this operation, bulge forming is performed. According to this embodiment, when pressure such as water pressure is applied to any gap between the molds 4 and 5 and the integral outer cylinder 3 up to an arbitrary set pressure from the injection port of the face plate 8, the molds 4 and 5 are tightened. The opening of the molds 4 and 5 due to the pressure within the material 6 during bulge forming can be completely restrained, and the dimensional accuracy of the material 6 after molding is extremely high.

Furthermore, during bulge forming and when moving the main body, the centering in the upward, downward, and axial directions can be maintained constant.

〔Effect of the invention〕

According to the present invention, the opening of the split mold can be completely restrained with a pressure lower than the molding pressure in bulge molding. Further, even if the integral outer cylinder of the main body is deformed during bulge forming and the frames of the frame portions at both ends are bent, the concentricity can always be maintained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a vertical sectional view of the main body when set, Fig. 3 is a sectional view (m-m arrow direction) of Fig. 1, and Fig. 4 is a frame. FIG.

Claims (1)

[Claims] 1. A mold in which a roller with a spring is provided at the lower part of the lower mold, a pilot groove is provided in the upper mold to which a rod tip for opening and closing is attached, and the upper mold and the lower mold are combined. The outer periphery of the outer cylinder is covered with an integral outer cylinder with an arbitrary gap, and the left and right sides of the cross-sectional center of the outer cylinder and the outer surface are attached to the main body supported by a trolley and the material in the mold from both ends. In the bulge forming device, which comprises a frame at both ends, the axial force that presses the ends of the main body through the face plate and the end face sealing force that presses both ends of the main body through the face plate are received by several tie bars connected to frames provided at both ends of the main body. The mold supported by the rollers and an outer cylinder having an arbitrary gap on its outer periphery are pressed from both ends through the face plate, pressure such as water pressure is applied to the gap, and the outer periphery of the split mold is A bulge forming device characterized by restraining. 2. In claim 1, the left and right outer surfaces of the center of the outer cylinder of the main body are supported by the trolley, deformation of the outer cylinder during bulge forming is avoided, and both ends of the frame parts are The structure supports the left and right sides of the center of the frame provided in the frame, eliminates misalignment of the center due to bending deformation of the frame, and always maintains the center of the main body and both end frame parts in the upper and lower directions. A bulge forming device characterized by: