JPH03180217A - Bulge forming device - Google Patents

Abstract

PURPOSE:To subject the opening part or the intermediate part of the work to buldge forming by providing the supporting bar positioned in the mold and providing the elastic body receiver at its top, the elastic body inserted in this supporting bar in freely movable, the punch and the pressurizing component to press the elastic body through this punch. CONSTITUTION:On the 1st means, the pipe like work is inserted in the die 2 which cover only the forming part of the work W, the punch 9 is pressurized along the supporting bar 6. The elastic body 8 is pressurized between this punch and the elastic body receiver 7 and its diameter is enlarged, and the work W is pressed to the inner surface of the die and formed. On the 2nd means, when the pressurizing member 10 is pressed down, the driven cam surface 9a of the punch 9 is pressed with the driving cam surface 10a, the forming work is executed as well as the 1st means. Therefore, the opening part or the intermediate of the work can be subjected to bulge forming without restrictions of shape and length, etc., of the work.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding device for applying basil processing to the mouth or the vicinity of the mouth of a vibrator-shaped work such as a long straight pipe or a curved pipe.

(Prior Art) Basil molding means for press-fitting a rubber-like elastic body into a cup-shaped workpiece housed in a mold is widely known (
Special Publication No. 5G-53834, No. 59-76828). When this forming means is used to form the mouth or middle part of a vibrator-like workpiece, it is necessary to pressurize the elastic body at the processing position within the workpiece, so a pair of punches are press-fitted from both sides of the workpiece. A method of closing one end of the workpiece and press-fitting a punch from the other end is used (Japanese Patent Application Laid-Open No. 58-9028, 5G-13G234).

(Problems to be Solved by the Invention) The means for molding the vibrator-like workpiece is to apply pressure to the elastic body from both sides of the workpiece, or to close one end and apply pressure from the other end. If the workpiece is a long or curved pipe, it is necessary to apply pressure or close the workpiece over almost its entire length, or to cover the workpiece with a long mold, which is difficult and difficult to do in practice. It is impossible to do so.

Therefore, it is an object of the present invention to provide a means for forming such a workpiece.

(Means for Solving the Problems) A first means for solving the problems in the present invention is to use a splittable mold having a molding surface on the inside, and a mold having a proximal end held in a fixed position and a distal end thereof being held in a fixed position. A support rod located in the mold and having an elastic body seat at its tip, an elastic body and a punch movably fitted to the support rod, and a pressure member that presses the elastic body through the punch. It is characterized by having
The second means includes a splittable mold that is fixed to plywood and has a molding surface inside, a support block that is fixed on the base plate opposite to the mold, and a base end that is connected to the support block. a support rod that is fixed and whose tip side is located within the mold and has an elastic body seat at the tip; an elastic body that is movably fitted to the support rod; and a punch that has an upward passive cam surface on its back surface; The present invention is characterized in that it includes a pressing member that can move up and down and has a driving cam surface that comes into contact with the passive cam surface of the punch.

(Function) In the first means, when a pipe-shaped workpiece is inserted into a mold that covers only the molding part of the workpiece and a punch is pressurized along the support rod, the elastic body engages with the punch. It is compressed between the elastic seats and expands in diameter, and the workpiece is pressed onto the inner surface of the mold and molded. Further, in the second means, when the pressure member is pressed down, the driving cam surface pushes the passive cam surface of the punch, and the forming process is performed in the same manner as in the first means.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes plywood, and a mold 2 for forming the mouth of a curved tube-shaped workpiece W is fixed to one end of the plywood. The molding surfaces 3a and 4a are formed on the inside.

A support block 5 is fixed to the base plate 1 facing the mold 2, and the mold 2 side serves as a guide surface 5a to guide a pressure member to be described later. A support rod 6 having a head 6a is screwed approximately concentrically with the mold 2. A steel elastic seat 7, a rubber elastic body 8, and a punch 9 each having a center hole are fitted into the support rod 6 in this order, and the punch 9 has an upward pressure receiving cam surface 9a on its back surface. is formed. A pressure member IO for pressurizing the punch 9 has a wedge-shaped downward pressure cam surface 10a.
and a vertical groove tob located above the support rod 6, the base plate 1 is
It is mounted on the machine base 11 of the press machine, and the pressurizing member 9 is mounted on the ram 12.

As described above, the upper mold 4 of the mold 2 is fixed to the lower mold 3 by a fixing means not shown.
and the opening W of the pipe-shaped workpiece W into the mold 2.
When the ram 12 is inserted into the gap 13 between the inner circumferential surface of the elastic body 8 and the outer circumferential surface of the elastic body 8, the pressurizing member 10 descends along the guide surface 5a with the vertical groove 10a straddling the support rod 6. , presses the passive cam surface 9a of the punch 9 with its driving cam surface 10a.

At this time, the pressure member IO is connected to the guide surface 5a and the passive cam surface 9.
Since it is press-fitted into the space between the guide surfaces 5 and 5 in a wedge shape, the reaction force is
A strong thrust acts on the punch 9, which is supported by the punch 9, moves the punch 9 along the support rod 6, presses the elastic body 6 against the elastic body seat 7, and expands the diameter. Due to this diameter expansion, the mouth of the workpiece W is pressed against the molding surfaces 3a, 4a inside the mold 2, and is bulged into the shape of the molding surfaces 3a, 4a. When the ram 12 is raised, the elastic body 8 returns to its original shape, and when the upper mold 4 is separated from the lower mold 3, the workpiece W can be taken out.

As described above, the present invention provides support rods 6 extending from the punch 9 side.
Since the elastic body 8 is supported via the elastic body seat 7, there is no need to insert a support member from the opposite end side of the workpiece W or to insert the elastic body and press it with a mold. Bulge forming can be easily performed even at the mouth of a bent workpiece W as shown in the figure.

The processing of the opening of a vibrator-shaped workpiece W has been described above, but it is also possible to process the opening of a container with a bottom. If the punch 9 is made longer, it is also possible to process the middle part of a straight pipe-shaped workpiece.

In addition, the punch 9 is not provided with a cam surface, and the punch is equipped with a surface pressure mechanism.
It may be directly driven by a screw mechanism or the like.

(Effects of the Invention) As described above, the present invention has the effect that the mouth or middle portion of the work can be bulge-formed without being constrained by the shape, length, etc. of the work.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention before processing, FIG. 2 is a vertical cross-sectional view after processing, and FIG. 3 is a slope view with the Ii-like body removed. Plate 2... Mold Mold 3... Lower Mold 4... Upper Mold 5... Support block 7... Elastic body seat 9... Punch 6... Support rod 8... Draw cod Sex body 10...Knees of 3 people other than pressure member =→ L12-

Claims (2)

[Claims] (1) A splittable mold having a molding surface on the inside, a support rod whose base end is held in a fixed position and whose distal end is located within the mold and has an elastic seat at the distal end, and the support rod. A bulge forming apparatus comprising: an elastic body and a punch movably fitted into the bulge forming apparatus; and a pressing member that presses the elastic body through the punch. (2) A splittable mold that is fixed to a base plate and has a molding surface on the inside, a support block that is fixed on the base plate opposite to the mold, and a base end that is fixed to the support block and a distal end. a support rod whose side is located within the mold and has an elastic seat at its tip;
The punch includes an elastic body movably fitted to the support rod and a punch having an upward passive cam surface on the back surface, and a pressurizing member that can move up and down and has a driving cam surface that abuts the passive cam surface of the punch. A bulge forming device characterized by: