KR101611769B1 - Die unit and press-forming apparatus having thereof - Google Patents

Abstract

The present invention provides a die unit capable of forming a product with excellent quality by solving that formability of a material to be formed becomes degraded in an initial stage of being pressed, and a press device including the same. According to an embodiment of the present invention, the die unit comprises: an outer die member having a hollow which a punch member enters to form the material to be formed; a rotation die member installed in an inner side of the outer die member to be able to rotate, wherein one end coming in contact with the material to be formed is provided in a round shape; and a large diameter member installed in the outer die member to be inserted into an insertion groove unit formed in the rotation die member as the punch member is inserted into the hollow, wherein a part coming in contact with the material to be formed in the large diameter member is provided in the round shape with a larger curvature radius than one end of the rotation die member. Moreover, in accordance with the other embodiment of the present invention, the press device comprises: the die unit; a punch unit including the punch member and a press cylinder pressing the punch member to the die unit; and a fixing unit installed in both ends of the die unit such that the material to be formed is attached to the die unit and supported.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a die unit and a press apparatus including the die unit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold unit and a press apparatus including the same, and more particularly, to an invention capable of improving moldability of a molding material at the beginning of a press.

In general, molds are collectively referred to as molds (molds) that can produce various products uniformly while maintaining the same quality of quality. The molds are made of plastic molds, forging molds, casting molds, injection molds, powder metallurgy molds .

Most parts such as automobile body and chassis are made of press mold. Generally, in the case of a press mold, the mold is integrally provided as a single mold, and the shape of the product is formed therein. In cooperation with the punch, the molding material is formed into the shape of the product.

Here, the material to be formed located between the mold and the punch is shaped by the pressurization of the punch, while the material to be molded flows into the mold and is stretched.

At this time, the degree of inflow of the molding material is determined by the blank holding force (BHF), the presence or absence of the draw bead, and the radius of curvature of the mold edge portion.

Particularly, in a portion where the radius of curvature of a mold having a large banding is large in the molding material, the degree of inflow of the molding material is small and there is a limit to be molded depending on the tension of the molding material.

That is, the corner portion connecting the flat portion in the shape of the product formed by molding the molding material shown in Fig. 1 is formed by the edge portion having a small radius of curvature of the mold. In this case, the elongation There arises a problem that molding defects such as breakage of the material to be molded occur, a problem of shape restriction due to the sectional design of the product, and a problem of weakening the structural rigidity of the product occur.

Accordingly, there is a need for a mold unit and a press apparatus including the mold unit to solve the above-described problems.

It is an object of the present invention to provide a mold unit capable of molding a product having excellent quality by improving the moldability of the material to be molded at the beginning of the press, and a press apparatus including the mold unit.

A mold unit according to an embodiment of the present invention includes an outer mold member having a hollow to which a punch member enters so as to mold the molding material, a rotating member rotatably mounted on the inner side of the outer mold member, Wherein the rotary mold member is provided in an additional round shape and the outer mold member is inserted in the insertion groove formed in the rotary mold member when the punch member is inserted into the hollow, And a large-diameter member provided in a round shape having a larger radius of curvature than one end of the member.

The rotating mold member of the mold unit according to an embodiment of the present invention may include a rotating body portion having the insertion groove portion and a mold rotation axis that is rotatably fitted in a mold rotation groove formed in the outer mold member, And is formed on the other side of the rotating body portion so as to be guided and rotated by the molding surface portion formed on one side of the rotating body portion and the concave surface portion formed inside the outer mold member so that the molding material pressed by the punch member comes into contact therewith And a guide curved surface portion that is formed on the guide surface.

Further, the rotating mold member of the mold unit according to an embodiment of the present invention may be configured such that, with reference to the rotating direction of the rotating body portion in which the punch member is inserted and rotated by the outer mold member, And a rear end portion of the expansion spring may be supported by a return groove formed in the guide curved surface portion.

The large diameter member of the mold unit according to an embodiment of the present invention is characterized in that the mold slot hole formed in the outer mold member in a shape extending in the entry direction of the punch member has a large diameter The body portion and one end portion adjacent to the insertion groove portion may be fixed to one end portion of the mold slot hole and the other end portion may include a contraction spring fixed to the movement axis.

The large-diameter member of the mold unit according to the embodiment of the present invention may be arranged such that the large-diameter body is prevented from being pushed in the direction opposite to the inserting direction of the punch member at the initial stage of insertion of the punch member into the outer mold member, And a stopper bar connected to the rotary mold member and rotatably coupled to the outer side of the outer mold member.

The stopper bar of the mold unit according to an embodiment of the present invention may further include a stopper bar provided so as to be in contact with the moving shaft so as to press the moving shaft extending to the outside of the outer mold member in the direction opposite to the punch member entry direction, 1 bar end, a bar center portion having a bar shaft rotatably fitted in a bar rotation hole formed in the outer mold member, and a long groove-like bar slot hole into which a bar guide tab protruding from a side surface of the rotary die member is inserted And a second bar end formed thereon.

According to another aspect of the present invention, there is provided a press apparatus comprising: a punch unit including the mold unit, the punch member, and a press cylinder for pressing the punch member to the mold unit; And a fixing unit provided at both ends of the mold unit so that the material can be closely contacted and supported.

The mold unit and the press apparatus including the mold unit of the present invention have an advantage that the material to be molded can be formed at a portion having a larger radius of curvature than the molding shape at the beginning of press molding.

Thereby, the effect can be obtained that the product can be formed into the shape of the product by the inflow, not by the tensile of the molding material.

That is, it is possible to prevent a portion stretched during molding from being concentrated on a part of the molding material.

Therefore, it is possible to prevent the problem that the molding is broken due to the breakage in a part of the molding material, the restriction of the product shape design can be relaxed, and the advantage .

1 is a perspective view showing a product in which a molding material is molded.
2 is a sectional view showing a press apparatus including a mold unit of the present invention.
3 is a cross-sectional view showing a mold unit of the present invention and a front view thereof.
4 is an enlarged view showing a portion C in Fig.
5 is a perspective view showing a rotating mold member in the mold unit of the present invention.
6A to 6E are operational state diagrams showing the mold unit of the present invention.
7 is a side view showing the large-diameter member in the mold unit of the present invention, a front view, and a perspective view showing the stopper bar of the large-diameter member.
8A to 8D are operational state diagrams showing the large-diameter member of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The mold unit (100) of the present invention and the press apparatus (1) including the mold unit (100) of the present invention relate to an invention capable of improving the moldability of the molding material (2) at the beginning of the press.

That is, the mold unit 100 of the present invention and the press apparatus 1 including the mold unit 100 can mold the material 2 to be molded in a portion having a larger radius of curvature than the molding shape at the initial stage of press molding.

Thereby, it is possible to form the shape of the product by the inflow of the molding material 2 rather than the tension thereof, and to prevent the portion to be stretched at the time of molding from being concentrated on a part of the molding material 2 do.

Therefore, it is possible to prevent a problem that a molding defect occurs due to breakage in a part of the molding material 2, and it is possible to alleviate the restriction of the product shape design and to prevent a part of the rigid structure of the product from being weakened .

2 is a sectional view showing a press apparatus 1 including a mold unit 100 of the present invention, and Figs. 6 (a) to 6 (e) are cross- Fig. 3 is an operational state view showing the mold unit 100 of the present invention. Fig.

6A shows a state before the punch member 210 is drawn into the mold unit 100. Fig. 6B shows a state before the punch member 210 is still in contact with the rotary mold member 120, The punch member 210 is partially inserted.

6C shows a state in which the workpiece 2 pressed by the punch member 210 pushes the rotating mold member 120 and the rotating mold member 120 rotates by a predetermined angle and the stopper bar 133 The large-diameter body portion 131 of the large-diameter member 130 moves upward, FIG. 6D shows a state in which the rotating metal member 120 rotates completely, and the large- Is completely inserted into the insertion groove of the mold member 120 so that the one end portion 120a of the rotating mold member 120 is in contact with the molding material 2. [

6E is a state in which the punch member 210 is pressed so as to be completely in contact with the inside of the outer mold member 110, and the molding is completed.

Referring to FIGS. 1, 2, and 6A to 6E, a mold unit 100 according to an embodiment of the present invention includes a hollow portion formed with a hollow into which the punch member 210 enters, A rotary mold member 120 rotatably disposed inside the outer mold member 110 and having one end portion 120a to which the workpiece 2 is contacted is provided in a round shape; The punch member 210 is provided in the outer mold member 110 so as to be inserted into the insertion groove 121 formed in the rotary mold member 120 as the punch member 210 is inserted into the hollow, And a large diameter member 130 provided in a round shape having a larger radius of curvature than the one end 120a of the rotary mold member 120. [

The press apparatus 1 according to another embodiment of the present invention includes the mold unit 100, the punch member 210 and a press cylinder (not shown) for pressing the punch member 210 to the mold unit 100 A fixed unit 300 provided at both ends of the mold unit 100 so that the punch unit 200 having the mold unit 100 and the molding unit 100 and the molding material 2 are held in close contact with the mold unit 100, . ≪ / RTI >

In other words, the mold unit 100, which is an embodiment of the present invention, can be included in the press apparatus 1 which is another embodiment of the present invention.

First, the press apparatus 1 will be described, and then the mold unit 100 will be described in detail. Here, the press apparatus 1 is an apparatus for press-molding a material 2 to be molded in the form of a product. For this purpose, the press apparatus 1 may include a mold unit 100, a punch unit 200, and a stationary unit 300 have.

The punch unit 200 may function to mold the workpiece 2 in the form of a product in cooperation with a mold unit 100 to be described later. To this end, the punch unit 200 may include a punch member 210 and a press cylinder 220.

The punch member 210 is configured to press the molding material 2 in cooperation with the mold unit 100, so that the shape of the product can be provided in advance. For example, in order to form the shape of the product shown in Fig. 1, the punch member 210 is formed in a shape corresponding to the shape of the product.

The press cylinder 220 serves to press the punch member 210 to the mold unit 100. That is, by the pressing force provided by the press cylinder 220, the molding material 2 is provided between the mold unit 100 and the punch member 210 to shape the shape of the product.

The fixed unit 300 may serve to fix and provide the molding material 2. For this purpose, the fixed unit 300 may be configured to sandwich the molding material 2 between the mold unit 100 and the fixed unit 300.

That is, a fixing member of the fixing unit 300 is provided at both ends of the mold unit 100, and the fixing member may be provided with fixing pressing means for pressing the mold unit 100 in the direction of the mold unit 100. For example, the fixed pressing means shown in Fig.

The mold unit 100 can form the shape of the product in the molding material 2 in cooperation with the punch unit 200 when the molding material 2 is pressed by the punch unit 200 to be described later Can play a role.

Particularly, in the mold unit 100, a member having a relatively large radius of curvature is provided in contact with the molding material 2 at the initial stage of molding of the molding material 2, and the radius of curvature is relatively small in the latter stage of molding, Can be provided.

To this end, the mold unit 100 may provide an outer mold member 110, a rotating mold member 120, and a large diameter member 130.

The rotating mold member 120 and the large diameter member 130 may be provided on the inner side of the outer mold member 110. The relative movement of the rotating mold member 120 and the large diameter member 130 may cause the non- Although the final shape is provided in the shape of the product, it is possible to provide a small inflow resistance for molding the molding material 2 at the initial stage of molding.

The outer mold member 110 is a basic mold into which the punch member 210 is inserted, and a hollow into which the punch member 210 is inserted is formed inside.

Particularly, the outer mold member 110 may provide a mold rotation groove 111, a concave surface portion 112, and a support tab 112a for coupling the rotating mold member 120 to each other. The description will be given later with reference to Figs. 3 and 5.

The outer mold member 110 may provide a mold slot hole 113, a bar turning hole 114, and a bar tap hole 115 for coupling the large diameter member 130 to each other. The description will be given later with reference to Fig. 4 and Fig.

The rotating mold member 120 is not in contact with the molding material 2 for molding at the initial stage of molding in which the punch member 210 is inserted into the outer mold member 110, 210 are further inserted into the outer mold member 110 to be in contact with each other for molding of the molding material 2 at the end of molding.

Particularly, the rotary mold member 120 rotates at a predetermined angle from the outer mold member 110 according to the degree of insertion of the punch member 210.

The rotary mold member 120 includes an insertion groove 121, a rotation body 122, a molding surface 123, a guide curved surface 124, an expansion spring 125, a bar guide tab 126, And the like. A detailed description thereof will be described later with reference to FIG. 3 and FIG.

The large diameter member 130 is in contact with the molding material 2 for molding at the initial stage of molding in which the punch member 210 is inserted into the outer mold member 110, Is inserted into the outer mold member (110) and goes to the end of molding, it does not contact the molding material (2) for molding.

That is, in order to reduce the inflow resistance of the molding material 2 at the initial stage of molding, the radius of curvature is larger than the one end portion 120a of the rotating mold member 120, which is brought into contact with the molding material 2 for molding, And is provided to be in contact with the to-be-molded material 2. However, at the end of the molding, when one end portion 120a of the rotating mold member 120 is to be brought into contact with the final product, will be.

For this, the large diameter member 130 may include a large diameter body 131, a contraction spring 132, a stopper bar 133 and the like, which will be described in detail with reference to FIGS. 4 and 7 .

Here, the operating state of the mold unit 100 will be described in full with reference to Figs. 6A to 6E.

6A is a state ready before the punch member 210 is drawn into the mold unit 100. The rotating mold member 120 is provided in a state rotated to one side by an expansion spring 125, 130 are provided by being moved in the direction in which the punch member 210 is introduced by the stopper bar 133.

6B shows a state in which the punch member 210 is partially inserted when it is in contact with the large-diameter member 130 before it contacts the rotary mold member 120 yet. At this time, the large diameter member 130 can be held at the original position by the stopper bar 133 (this will be described later with reference to FIGS. 8A to 8D), whereby the punch member 210 is moved Even when the molding material 2 is pressed, the molding material 2 can be closely contacted and supported to be molded.

6C shows a state in which the workpiece 2 pressed by the punch member 210 pushes the rotating mold member 120 while the rotating mold member 120 rotates by a predetermined angle and the stopper bar 133 And the large diameter body portion 131 of the large diameter member 130 is moved upward.

That is, the punch member 210 pushes the rotating mold member 120. Since the pushing force of the punch member 210 is larger than the inflation elastic force of the expansion spring 125, Is rotated.

Accordingly, the stopper bar 133 connected to the rotating mold member 120 is also rotated, and the rotation of the stopper bar 133 (which will be described later with reference to FIGS. 8A to 8D) The force pushing the member 130 downward is removed, and the large diameter member 130 is moved upward by the contracting spring 132.

6D shows a state in which the rotary mold member 120 is completely rotated and the large diameter body part 131 is completely inserted into the insertion groove of the rotary mold member 120 and the one end 120a of the rotary mold member 120 Is in contact with the material 2 to be formed.

At this time, the one end 120a of the rotating mold member 120 is contacted with the molding material 2, and is molded into a final product form. Particularly, since the large diameter member 130 is provided with a larger radius of curvature than the one end portion 120a of the rotary mold member 120, the radius of the large diameter member 130 is provided to a relatively large radius of curvature R2 until the intermediate molding step, 2 is reduced and the moldability is improved.

6E is a state in which the punch member 210 is pressed so as to be completely in contact with the inside of the outer mold member 110, and the molding is completed.

FIG. 3 is a cross-sectional view and a front view showing the mold unit 100 of the present invention, and FIG. 5 is a perspective view showing the mold member 120 in the mold unit 100 of the present invention.

3 (b) is a front view of the mold unit 100, FIG. 3 (a) is a sectional view of the AA portion in FIG. 3 (b) c) shows a cross-sectional view of the BB part in Fig. 3 (b).

3 and 5, the rotating mold member 120 of the mold unit 100 according to the embodiment of the present invention includes the insertion groove 121 formed therein, and the outer mold member 110 A rotary body part 122 provided with a mold rotating shaft 122a to be rotatably fitted in a formed mold rotating groove 111, And is rotatably supported on the other side of the rotating body part 122 so as to be guided and rotated by a molding surface part 123 formed on one side of the body part 122 and a concave surface part 112 formed inside the outer mold member 110. [ And may further include a guide curved surface portion 124 formed therein.

The rotating mold member 120 of the mold unit 100 according to an embodiment of the present invention may be configured such that the punch member 210 is inserted into the outer mold member 110 to rotate the rotary body part And a rear end portion of the guide curved surface portion 124 protrudes in the direction of the rotating body portion 122 and is supported by a support tab 112a formed on the concave surface portion 112. In addition, And an expansion spring 125 which is supported by the return groove 124a formed in the first housing 120a.

That is, the rotary mold member 120 rotates in cooperation with the outer mold member 110 to change the position of the rotary mold member 120 to form the molding material 2, A shaping surface portion 123, a guide curved surface portion 124, an expansion spring 125, a bar guide tab 126, and the like.

The outer mold member 110 for cooperating with the rotary mold member 120 may also include a mold rotation groove 111, a concave surface portion 112, a support tab 112a ) Can be provided.

The rotating body part 122 is a basic body of the rotating mold member 120 and includes a molding surface part 123 to be described later, a guide curved surface part 124, A groove 121 is provided.

Particularly, the rotating body 122 is provided with a mold rotating shaft 122a connected to a mold rotating groove 111 formed in the outer mold member 110, and the mold rotating shaft 122a is rotated by the mold rotating The rotation body portion 122 can be provided with a degree of freedom of rotation while being inserted into the groove 111. [

The molding surface portion 123 refers to one surface formed on the rotating body portion 122 and is a surface portion formed with a molding shape for molding the molding material 2 in cooperation with the punch member 210.

In other words, when the punch member 210 is completely inserted into the outer mold member 110 to form the molding material 2 in the shape of the final product, the surface to be brought into contact with the molding material 2 So that the molding surface portion 123 is formed.

Particularly, the radius of curvature R1 of one end portion 120a of the molding surface portion 123 which requires much bending of the workpiece 2 is formed to be smaller than the radius of curvature R2 of the large- Which is equal to the radius of curvature of the final product being produced.

However, since the large diameter member 130 is brought into contact with the large diameter member 130 during the molding intermediate process, the large diameter member 130 having a relatively large radius of curvature till the intermediate molding is brought into contact with the mold, thereby reducing the inflow resistance of the molding material 2, And the like.

The guide curved surface portion 124 refers to the other surface of the rotating body portion 122 provided for rotating the rotating body portion 122. The guide curved surface portion 124 cooperates with the concave surface portion 112 of the outer mold member 110, Thereby guiding the rotation drive.

That is, a concave surface portion 112 which is a concave surface portion is formed on the inner side surface of the outer mold member 110 to which the rotary mold member 120 touches, and the rotary mold member 120 A curved guide curved surface portion 124 can be formed and provided on the other surface.

The guide curved surface portion 124 is guided along the concave surface portion 112 and rotates the rotary body portion 122 when the rotary body portion 122 is rotated about the mold rotation axis 122a, .

In the meantime, the rotary body part 122 may be provided with an insertion groove 121, which is a portion into which the large-diameter member 130 is inserted. In the initial stage of molding, the large- The large diameter member 130 is provided at the outer end of the insertion groove 121, but is moved toward the inner end of the insertion hopper at the end of molding.

In addition, when the punch member 210 is retreated by the completion of the forming of the molding material 2, the rotating mold member 120 rotates and returns to its original position, . ≪ / RTI >

For this purpose, the rotary mold member 120 may further include an expansion spring 125. That is, due to the expansion elastic force of the expansion spring 125, the rotary mold member 120 can be returned to its original position.

In other words, the rotary body part 122 of the rotary mold member 120 may be provided with a return groove 124a on which the expansion spring 125 can be seated, and the outer mold member 110 is rotated A support tab 112a inserted into a part of the groove 124a may be provided and provided.

The expansion spring 125 is provided between the support tab 112a and one end of the return groove 124a so that the expansion elastic force of the expansion spring 125 can be transmitted to the rotation body 122 .

Particularly, the punch member 210 is inserted into the outer mold member 110 and rotated to provide an expansion elastic force by which the expansion spring 125 returns the rotating body portion 122 to its original position The front end of the expansion spring 125 protrudes in the direction of the rotating body part 122 and is supported on the support tab 112a formed on the concave surface part 112, And a rear end portion of the expansion spring 125 may be coupled to one end of a return groove 124a formed in the guide curved surface portion 124. [

In addition, when the expansion spring 125 lacks the elastic force to be provided, a plurality of the rotation grooves 124a and the support tabs 112a may be provided in the rotating body part 122. Accordingly, May be provided.

7 is a side view showing the large diameter member 130 in the mold unit 100 of the present invention and a front view and a stopper bar 133 of the large diameter member 130. As shown in FIG. FIG.

7A is a side view of the large-diameter body portion 131, FIG. 7B is a front view of the large-diameter body portion 131, and FIG. 7C is a perspective view of the stopper bar .

8A to 8D are diagrams showing an operation state of the large diameter member 130 according to the present invention. FIG. 8A shows the structure of the basic large diameter member 130, FIG. 8B shows a state in which the rotating mold member 120 is in the original position And the state of preparation provided to the user.

8C shows a state in which the rotating mold member 120 is rotated by a predetermined angle and the stopper bar 133 is also rotated and rotated by a predetermined angle. FIG. 8D shows a state in which the stopper bar 133 rotates, And the large diameter member 130 is moved upward by removing the force of supporting the support member 130 downward.

4, 7 and 8A to 8D, the large diameter member 130 of the mold unit 100 according to the embodiment of the present invention has a shape extending in the entry direction of the punch member 210 A large diameter body portion 131 provided with a moving shaft 131a to be guided in a mold slot hole 113 formed in the outer mold member 110 and one end portion adjacent to the insertion groove portion 121 are inserted into the mold slot 113, And may include a shrinking spring 132 fixed to one end of the hole 113 and the other end fixed to the moving shaft 131a.

The large diameter member 130 of the mold unit 100 according to an embodiment of the present invention is formed such that the punch member 210 is inserted into the outer mold member 110 at an initial stage, And a stopper bar 133 coupled to the outer mold member 110 so as to be rotatably coupled to the outer mold member 110 in cooperation with the rotating mold member 120 so as to prevent the punch member 210 from being pushed in a direction opposite to the direction of insertion of the punch member 210 .

The stopper bar 133 of the mold unit 100 according to an embodiment of the present invention is configured such that the moving shaft 131a extending to the outside of the outer mold member 110 enters the punch member 210 A first bar end portion 133a provided so as to be in contact with the moving shaft 131a so as to be pressed in a direction opposite to the direction of rotation of the rotary shaft 133d, and a bar rotation hole 114 formed in the outer mold member 110, And a second bar end 133c formed with a long groove-like bar slot hole 133e into which a bar guide tab 126 protruding from the side surface of the rotary mold member 120 is inserted. ).

That is, the large diameter member 130 has a large-diameter body portion 131, a contraction spring 132, and a large diameter portion 140 in cooperation with the rotary mold member 120 and the outer mold member 110, The stopper bar 133, and the like.

The outer mold member 110 for cooperating with the large diameter member 130 may provide a mold slot hole 113, a bar turning hole 114, a bar tapped hole 115, and the like.

The large diameter body portion 131 is provided in cooperation with the constriction spring 132 and the stopper bar 133. The large diameter body portion 131 is provided with the large diameter diameter portion 131, Is provided at a radius of curvature (R2) that is larger than a curvature radius (R1) of one end (120a) of the rotary mold member (120), whereby the inflow resistance of the molding material (2) .

The large diameter body part 131 is provided in connection with the outer mold member 110. More specifically, a moving shaft 131a formed on the large diameter body part 131 is connected to the outer mold member 110 And is guided in the formed mold slot hole 113 to be linked with each other.

At this time, the moving shaft 131a and the mold slot hole 113 are provided in association with a later-described constriction spring 132. The moving shaft 131a is supported at an initial stage of molding by a stopper bar 133 Can be provided.

The moving shaft 131a is provided to be guided and moved in the mold slot hole 113 formed in a direction parallel to the insertion direction of the punch member 210. That is, the moving shaft 131a is supported by the stopper bar 133 in the direction opposite to the inserting direction of the punch member 210 at the initial stage of molding, but when the stopper bar 133 is rotated and the supporting force is removed, And is moved in the inserting direction of the punch member 210 along the mold slot hole 113 by the contracting spring 132.

Accordingly, the large diameter body 131 can be driven to be inserted into the insertion groove formed in the rotary mold member 120.

The shrinking spring 132 serves to provide a shrinking elastic force for pulling the large-diameter body part 131 into the insertion groove.

The contraction spring 132 is fixed at one end to the mold slot hole 113 and at the other end to the moving shaft 131a to provide a shrinking elastic force to the large diameter body portion 131. [ .

In order to secure a force for inserting the large diameter body portion 131 into the insertion groove, a plurality of the compression spring 132 may be provided at one end of the plurality of compression spring 132, 113, and the other end can be fixedly provided to the moving shaft 131a.

The stopper bar 133 serves to press the large diameter body portion 131 in a direction opposite to the direction in which the punch member 210 is pulled in at the beginning of molding of the molding material 2. [ For this purpose, the stopper bar 133 may be provided in association with the rotating mold member 120 and the outer mold member 110.

The stopper bar 133 is rotatably coupled to the outer surface of the outer mold member 110 so that the stopper bar 133 is inserted into the bar hole 114 formed in the outer mold member 110, And the bar rotation shaft 133d formed in the bar center portion 133b, which is the middle portion of the bar shaft 133b, is rotated.

The first bar end 133a which is one end of the stopper bar 133 is provided so as to be in contact with the moving shaft 131a so that the moving shaft 131a is supported in a direction opposite to the direction in which the punch member 210 is inserted / RTI >

In addition, when the punch member 210 is further pulled into the outer mold member 110 while moving toward the end of the molding material 2, the rotating mold member 120 rotates. At this time, 133 can also be rotated in conjunction with each other.

That is, the long bar-shaped slot 133e formed at the second bar 133c, which is the other end of the stopper bar 133, has a bar guide tab 126 protruding from the side surface of the rotating mold member 120, When the rotary mold member 120 rotates, the bar guide tab 126 also moves in the rotating direction of the rotary mold member 120. At this time, the bar guide tab 126 is inserted into the bar slot hole The stopper bar 133 is pivoted about the bar rotating shaft 133d by pushing the second bar end 133c of the stopper bar 133 along the first bar 133c.

The bar guide tab 126 may protrude outwardly from the outer mold member 110 in order to connect the bar guide tab 126 to the stopper bar 133 provided outside the outer mold member 110 A bar-shaped tapped hole 115 may be formed. The bar tapped holes 115 may be provided in a long hole shape along the path of the bar guide tabs 126.

8A to 8D, first, FIG. 8A can be referred to as showing a configuration of a basic large-diameter member 130. FIG.

8B shows a preparation state in which the rotary mold member 120 is provided in the original position. That is, the rotating mold member 120 is in the original position, and the stopper bar 133 is also pressed in the state of being fixed to the original position.

8C shows a state in which the rotating mold member 120 is rotated by a predetermined angle and the stopper bar 133 is also rotated and rotated at a predetermined angle.

That is, when the rotary mold member 120 rotates, the bar guide tab 126 formed on the rotary mold member 120 is rotated. When the bar guide tab 126 rotates, the stopper bar 133 2 bar end portion 133c to push the stopper bar 133 about the bar rotation shaft 133d.

8D shows a state in which the large diameter member 130 is moved upward by removing the force of supporting the large diameter member 130 by the rotation of the stopper bar 133. [

That is, the pressing force of the moving shaft 131a is removed by the rotation of the stopper bar 133, and the shrinking spring 132 fixed to the moving shaft 131a causes the large diameter body portion 131 are moved to the inside of the insertion groove.

When the rotary mold member 120 is returned to its original position by the expansion spring 125, the stopper bar 133 is rotated back to its original position. At this time, The large diameter member 130 is returned to its original position while the end 133a is pushed again on the moving shaft 131a moved toward the insertion groove.

1: Press apparatus 2: Molded material
100: mold unit 110: outer mold member
111: mold rotating groove 112: concave surface portion
113: mold slot hole 114: bar rotation hole
115: bar tap hole 120: rotary mold member
121: insertion groove portion 122: rotation body portion
123: molding surface portion 124: guide curved surface portion
125: expansion spring 126: bar guide tab
130: large diameter member 131: large diameter body part
132: Retraction spring 133: Stopper bar
200: punch unit 210: punch member
220: press cylinder 300: fixed unit

Claims (7)

An outer mold member having a hollow into which the punch member enters so as to form a molding material;
A rotary mold member which is rotatably disposed inside the outer mold member and is provided with a rounded end at which the molding material contacts; And
Wherein the punch member is provided in the outer mold member so as to be inserted into the insertion groove portion formed in the rotary mold member when the punch member is inserted into the hollow and a portion in contact with the molding material has a roundness larger than a radius of curvature at one end of the rotary mold member A large diameter member provided in a shape;
. The method according to claim 1,
The rotary mold member may include:
A rotating body part having the insertion groove formed therein and having a mold rotation axis which is rotatably fitted in a mold rotation groove formed in the outer mold member;
A molding surface portion formed on one side of the rotating body portion such that the molding material pressed by the punch member abuts; And
A guide curved surface portion formed on the other side of the rotating body portion to be guided and rotated by a concave surface portion formed inside the outer mold member;
Further comprising: 3. The method of claim 2,
The rotary mold member may include:
A front end portion protruding in the direction of the rotating body portion is supported by a support tab formed on the concave surface portion with respect to a rotating direction of the rotating body portion into which the punch member is inserted and rotated with the outer mold member, An expansion spring supported by a return groove formed in the guide curved surface portion;
Further comprising: The method according to claim 1,
The large-
A large diameter body portion having a moving shaft fitted in a guide slot in a mold slot formed in the outer mold member in a shape extending in a direction in which the punch member enters; And
One end portion adjacent to the insertion groove portion is fixed to one end portion of the mold slot hole and the other end portion is fixed to the movement shaft;
. 5. The method of claim 4,
The large-
Diameter body is rotatably coupled to the outside of the outer mold member in association with the rotating mold member so as to prevent the large-diameter body from being pushed in a direction opposite to the inserting direction of the punch member at the initial stage of insertion of the punch member into the outer mold member Stopper bar;
Further comprising: 6. The method of claim 5,
The stopper bar
A first bar end provided in contact with the moving shaft so as to press the moving shaft extending to the outside of the outer mold member in a direction opposite to the punch member entry direction;
A bar having a bar rotatably fitted in a bar hole formed in the outer mold member; And
A second bar end formed with a long groove-like bar slot hole into which a bar guide tab protruding from a side surface of the rotary mold member is inserted;
. A mold unit according to any one of claims 1 to 6;
A punch unit including a punch member and a press cylinder for pressing the punch member with the mold unit; And
A fixing unit provided at both ends of the mold unit so that the molding material is held in close contact with the mold unit;
.

Images