KR101611306B1 - Changing type foamforming mold - Google Patents

Abstract

In particular, the present invention relates to a replaceable foamed foam forming die, and more particularly, it relates to a replaceable foamed foam forming die, in which a forming die is bolted to a fixing plate via a replacement plate, whereby a starting die, a PILOT die, The present invention relates to a replaceable foamed foam molding die capable of replacing only the replacement plate and the molding die and using the fixing plate as it is so that the time, effort and cost for manufacturing the mold can be reduced.
The forming means of the replaceable foam forming mold according to the present invention is characterized in that the replaceable foam forming mold includes an upper fixing plate coupled to the upper main frame and having an opening formed in the upper surface thereof, A lower fixing plate disposed opposite to the upper fixing plate and having an opening formed in the upper surface of the upper fixing plate, an upper molding die installed at the opening of the upper fixing plate, and a lower molding member provided at the opening of the lower fixing plate, An upper replacement plate disposed between the upper fixing plate and the upper forming die, one end of the upper fixing plate being bolted to the upper fixing plate and the other end being bolted to the upper forming die; The lower end of which is bolted to the lower fixing plate and the other end of which is bolted to the lower molding die, That made, including board characterized.

Description

{CHANGING TYPE FOAMFORMING MOLD}

In particular, the present invention relates to a replaceable foamed foam forming die, and more particularly, it relates to a replaceable foamed foam forming die, in which a forming die is bolted to a fixing plate via a replacement plate, whereby a starting die, a PILOT die, The present invention relates to a replaceable foamed foam molding die capable of replacing only the replacement plate and the molding die and using the fixing plate as it is so that the time, effort and cost for manufacturing the mold can be reduced.

In general, product molding molds such as foamed polypropylene (EPP), expanded polystyrene (EPS), foamed polyethylene (EPE) and Hanseran are manufactured by using high pressure steam, such as EPP, EPS, EPE, EPP, EPS, EPE, Hanseran, etc. filled in the molding space of the molding die are fused together to form products such as EPP, EPS, EPE and Hanseran of a certain shape.

EPP, EPS, EPE and Hanseran are more environmentally friendly than materials such as urethane, so they can be used as handles especially for rims, sun visors for vehicles, PADs, It is widely used as a functional part for private use and a box for packing.

Referring to FIG. 1, the conventional product molding molds such as EPP, EPS, EPE, and Hanselen are formed of a stationary mold 10 and a movable mold 20. The stationary mold 10 includes a fixed support plate 12, a fixed frame 14 coupled to one side of the fixed support plate 12, and a core 16 coupled to one side of the fixed frame 14 .

The movable mold 20 is provided symmetrically with the stationary mold 10 so as to move toward and join the stationary mold 10. The movable mold 20 includes a movable base plate 22 and a movable base plate 22, And a cavity 26 coupled to one side of the moving frame 24.

A raw material injector 28 for supplying a raw material to a molding space formed between the cavity 26 and the core 16 is provided at a predetermined position on one side of the moving bed plate 22, At least one ejecting mechanism (30) for removing the molded article molded in the molding space away from the cavity (26) is provided.

In addition, a plurality of cooling water supply nozzles 32 connected to a cooling water supply pipe (not shown) are provided at predetermined positions on the inner surface of the fixed support plate 12 and the moving support plate 22.

However, as described above, the product molding molds such as the conventional EPP, EPS, EPE, Hanselen, and the like have a cavity 26 in which the product is substantially molded and a core 16 which is fixed to the movable frame 24 and the fixed frame 14 Since the moving mold 24 and the stationary frame 14 are bolted to each other, when the product to be molded is changed, the movable mold 20 and the stationary mold 10, which are heavy and bulky, It was common to replace itself.

That is, when the cavity 26 and the core 16 are changed or the cavities 26 and the cores 16 of different sizes are to be changed according to the molded product, the movable mold 20 and the stationary mold 10, There arises a problem that the whole needs to be replaced, resulting in cost reduction, and it takes more effort, time, and cost than necessary.

In addition, since the fixed mold 10 and the movable mold 20 must be separately manufactured according to the product specifications, the cost of manufacturing the mold is increased, and in the case of the mass production mold having a starting mold, the PILOT mold, There is a problem that the time, effort, and cost for producing a mold increase.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a mold for molding a mold, a mold for molding, It is not necessary to replace the entire mold including the fixing plate. Instead, only the replacement plate and the molding die can be replaced, and the fixing die can be used as it is. Thus, a replacement foam molding die can be used to reduce the time, effort, The purpose is to provide.

According to another aspect of the present invention, there is provided an interchangeable foamed foam forming die, comprising: an upper fixed plate coupled to an upper main frame and having an opening formed in a plate surface; A lower fixed plate coupled to the lower main frame and opposed to the upper fixed plate and having an opening formed in the plate surface, an upper molding die installed at the opening of the upper fixing plate, and an upper molding die provided at the opening of the lower fixing plate, An upper replacement plate disposed between the upper fixing plate and the upper molding die and having one end bolted to the upper fixing plate and the other end bolted to the upper molding die to form a molding space in an inserted state, A lower fixing plate disposed between the lower fixing plate and the lower molding die, one end thereof being bolted to the lower fixing plate, And the other end is bolted to the lower molding die.

Here, the upper forming die has a downward convex shape to be inserted into the lower forming die, and includes a horizontal coupling portion in which the other end and one side of the upper replacement plate are in contact with each other, And a convex portion integrally coupled to an inner lower end portion of the vertical sliding portion and protruding inwardly.

The molding space is sealed by the lower surface of the vertical sliding portion and the outer surface of the convex portion in a state where the upper forming die is inserted into the lower forming die.

Here, the other end of the upper replacement plate is in contact with only one side of the horizontal coupling portion, the other side portion of the horizontal coupling portion remains exposed, and a vertical direction from the exposed portion of the horizontal coupling portion to the lower surface of the vertical sliding portion And a steam hole is formed.

In addition, an engaging protrusion protruding outwardly is formed on the upper outer surface of the lower forming die for bolt tightening with the lower replacing plate.

According to the replaceable foamed metal forming mold of the present invention having the above-described problems and the solution, since the forming mold is configured to be bolted to the fixing plate via the replacement plate, it is possible to manufacture a mold for starting a mold, a PILOT mold, It is possible to replace the entire mold including the fixing plate with the replacement plate and the molding die, and to use the fixing plate as it is, thereby saving time, effort and cost for manufacturing the mold.

1 is a schematic view of a conventional conventional molding die.
2 is a perspective view of a replaceable foam foam forming mold according to an embodiment of the present invention.
3 is a cross-sectional front view of the forming process of the replaceable foam foam forming mold according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view illustrating a process of molding a replaceable foam foam molding die according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a replaceable foamed metal forming mold according to the present invention having the above-described problems, solutions and effects will be described in detail with reference to the accompanying drawings.

The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator.

FIG. 2 is a perspective view of a replaceable foam foam forming die according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of a replaceable foam foam forming die according to an embodiment of the present invention, Sectional view of a replaceable foamed foam forming mold according to an exemplary embodiment of the present invention.

As shown in FIGS. 2 to 4, the replaceable foamed foam forming mold according to the embodiment of the present invention is formed by combining the upper mold 10 and the lower mold 30. The upper mold 10 and the lower mold 30 are opposed to each other and the lower mold 30 is provided with a material injection module 51 for injecting the material into the molding space s, And an eject module 53 for releasing the molded article from the molding space.

The upper metal mold 10 includes an upper main frame 11, an upper fixed plate 13 coupled to the upper main frame 11, an upper replacement plate 15 coupled to an opening of the upper fixed plate 13 by bolts, And an upper forming mold 17 disposed at an opening of the upper replacing plate 15 and coupled to an opening of the upper replacing plate 15 by bolting.

The upper main frame 11 constitutes an outer appearance and a skeleton of the replaceable foamed foam forming metal mold and stably arranges the upper fixing plate 13 by bolting with the upper fixing plate 13.

The upper fixing plate 13 has an opening formed therein. The outer end of the upper fixing plate 13 is coupled to the upper main frame 11 by bolts. The upper end of the upper replacement plate 15 is bolted Lt; / RTI >

One end of the upper replacement plate 15 is coupled to the upper fixing plate 13 by bolts, and an opening is formed therein. Accordingly, the upper end of the upper replacement plate 15 is coupled to the upper fixing plate 13 by bolts, and the upper end of the upper molding plate 17 is coupled to the inner end of the upper end of the upper replacement plate 15 by bolts.

The upper mold frame 17 is disposed at an opening of the upper replacement plate 15 and is coupled to the other end, that is, the inner end of the upper replacement plate 15 by bolting. The upper forming mold 17 is inserted into a lower forming mold 37 constituting the lower mold 30 so that a molding space s is formed in the lower molding mold 37.

The upper forming frame 17 is not fastened directly to the upper fixing plate 13 but is fastened to the upper fixing plate 13 via the upper replacement plate 15 as described above. The upper replacement plate 15 is coupled to the upper fixing plate 13 and the upper molding die 17 by bolts.

Therefore, it is very easy to manufacture the starting mold, the PILOT mold, the mass-production mold having a small amount of production or the upper mold, and the time, cost, and effort required for manufacturing are reduced. In particular, since only the upper replacement plate 15 and the upper forming mold 17 can be separated and replaced while the upper fixing plate 13 remains unchanged, the cost can be reduced, , Effort, and cost.

In other words, when the shape of the upper mold 17 is changed or the size thereof is changed according to the change of the mold, the entire upper mold including the upper clamping plate 13 must be replaced. However, in the case of the replaceable foamed foam forming mold according to the present invention, the upper fixing plate 13 is left as it is, the upper replacement plate 15 is fitted to the upper forming mold 17 to be replaced, By fastening the bolts to the existing upper fixing plate 13, the diaphragm can be advanced. As a result, since the upper fixing plate 13 can be used as it is, the cost can be reduced, and the time, effort, and cost required for diverting can be reduced.

The lower mold 30 corresponding to the upper mold 10 is engaged with the upper mold 17 of the upper mold 10 to form the molding space s.

The lower mold 30 includes a lower main frame 31, a lower fixed plate 33 coupled to the lower main frame 31, a lower replacement plate 35 coupled to the opening of the lower fixed plate 33 by bolts, And a lower forming mold 37 disposed at an opening of the lower replacement plate 35 and coupled to an opening of the lower replacement plate 35 by bolting.

The lower main frame 31 constitutes an outer appearance and a skeleton of the replaceable foam forming mold and stably arranges the lower fixing plate 33 by bolting with the lower fixing plate 33.

The lower fixing plate 33 has an opening formed therein. The outer end of the lower fixing plate 33 is coupled to the lower main frame 31 by bolts. The lower end of the lower fixing plate 35 is bolted Lt; / RTI >

One end of the lower replacement plate 35 is coupled to the lower fixing plate 33 by bolts, and an opening is formed therein. Accordingly, the lower end of the lower replacement plate 35 is coupled to the lower fixing plate 33 by bolts, and the lower end of the lower molding plate 37 is coupled to an inner end of the lower replacement plate 35 where the openings are formed.

The lower molding die 37 is disposed at an opening of the lower replacement plate 35 and is coupled to the other end, that is, the inner end of the lower replacement plate 35 by bolting. The upper forming mold 17 constituting the upper mold 10 is inserted into the lower forming mold 37 to form a molding space s therein.

The lower forming frame 37 is not fastened directly to the lower fixing plate 33 but is fastened to the lower fixing plate 33 via the lower replacement plate 35 as described above. The lower replacement plate 35 is coupled to the lower fixing plate 33 and the lower molding die 37 by bolts.

Accordingly, it is very easy to manufacture the starting mold, the PILOT mold, the mass-production mold having a small production amount or the lower mold, and the time, cost and effort required for the production are reduced. In particular, since only the lower replacement plate 35 and the lower forming mold 37 can be separated and replaced while the lower fixing plate 33 remains unchanged, the cost can be reduced, , Effort, and cost.

That is, when the shape of the lower mold 37 is changed or the size thereof is changed in accordance with the production of the starting mold, the PILOT mold, the mass production mold having a small amount of production, or the like, The cost reduction can not be achieved. However, in the case of the replaceable foamed foam forming mold according to the present invention, the lower fixing plate 33 is left as it is, and after joining the appropriate lower replacement plate 35 to the lower forming mold 37 to be replaced, By bolting to the existing lower fixing plate 33, it is possible to proceed with the production of the starting mold, the PILOT mold, and the mass production mold having a small amount of production. As a result, the cost can be reduced because the lower fixing plate 33 can be used as it is, and advantages such as the start mold, the PILOT mold, and the time, effort, .

The upper mold 10 includes an upper main frame 11, an upper fixing plate 13, and a lower mold 14. The upper mold 10 and the lower mold 30 are formed of a metal plate, The lower mold 30 includes a lower main frame 31, a lower fixing plate 33, a lower replacement plate 35, and a lower molding die 35. The lower mold 30 includes a lower main frame 31, And a frame (37).

As described above, the upper fixing plate 13 is coupled to the upper main frame 11, and an opening is formed on the plate surface. An upper forming mold 17 is disposed in this opening. More precisely, a medium for connecting the upper forming mold 17, that is, the upper replacement plate 15 is disposed and coupled to the opening of the upper fixing plate 13. [

The lower fixing plate 33 is coupled to the lower main frame 31, and is opposed to the upper fixing plate 13, and has an opening formed on the plate surface. A lower forming mold 37 is disposed in this opening. More precisely, a medium for connecting the lower forming mold 37, that is, a lower replacement plate 35 is disposed and coupled to the opening of the lower fixing plate 33.

The upper mold (17) is installed in the opening of the upper fixing plate (13). The upper mold frame 17 is installed at the opening of the upper fixing plate 13 but is not fastened to the upper fixing plate 13 but is fixed to the upper fixing plate 13 via the upper replacement plate 15. [ Respectively. Therefore, the upper replacement plate 15 is disposed and coupled to the opening of the upper fixing plate 13, and the upper forming die 17 is disposed and coupled to the opening of the upper replacement plate 15. [

The lower molding frame 37 is installed in the opening of the lower fixing plate 33 and forms a molding space s in a state where the upper molding frame 37 is inserted. The lower molding plate 37 is installed at the opening of the lower fixing plate 33 but is not fastened to the lower fixing plate 33 but is fixed to the lower fixing plate 33 via the lower replacement plate 35. [ Respectively. Therefore, the lower replacement plate 35 is disposed and coupled to the opening of the lower fixing plate 33, and the lower forming frame 37 is disposed and coupled to the opening of the lower replacement plate 35.

The upper replacement plate 15 connecting between the upper fixing plate 13 and the upper molding die 17 is disposed between the upper fixing plate 13 and the upper molding die 17, (13) and the other end is bolted to the upper forming mold (17).

The lower replacement plate 35 connecting between the lower fixing plate 33 and the lower molding die 37 is disposed between the lower fixing plate 33 and the lower molding die 37, And is bolted to the lower fixing plate 33 and the other end is bolted to the lower forming mold 37. [

The replaceable foamed foam forming mold according to the present invention having the above-described constitution and the combination is characterized in that the upper forming mold 17 and the lower forming mold 37 are fastened to the corresponding upper and lower fixing plates 13, And the upper and lower replacement plates 15 and 35 are coupled to each other via the upper and lower replacement plates 15 and 35, The upper forming mold 17 and the lower forming mold 37 are connected to the corresponding upper and lower replacing plates 15 and 35 at the time of the presenting, It can be easily separated from the fixing plate 13 and the lower fixing plate 33.

Then, the upper and lower molds having the new shape or size are coupled to the appropriate upper and lower replacement plates, and the upper and lower replacement plates are bolted to the corresponding upper and lower fixing plates, respectively, Can be combined. At this time, the upper and lower replacement plates to be replaced have a size and shape such that the upper forming mold and the lower forming mold to be replaced can be fastened to the corresponding upper and lower fixing plates.

Meanwhile, the upper forming mold 17 is inserted into the lower molding mold 37 to seal the inner space of the lower molding mold 37, thereby forming the molding space s.

As shown in FIGS. 3 and 4, the upper forming mold 17 has a downward convex shape to be inserted into the lower forming mold 37. The upper forming mold 17 has a structure capable of being slidably inserted into the lower forming mold 37 and has a structure capable of being bolt-fastened to the upper replacing plate 15. A steam hole 17e can be easily Can be formed.

Specifically, it is preferable that the portion of the upper forming die 17, which is coupled to the upper replacing plate 15, that is, the upper end has an "a" shape. That is, the upper forming frame 17 includes a horizontal coupling portion 17a horizontally formed to be in contact with the other end of the upper replacement plate 15 and a lower coupling portion 17b formed at the other side of the horizontal coupling portion 17a. A vertical sliding part 17b which is vertically extended in a direction perpendicular to the vertical sliding part 17b and slides on the inner surface of the lower forming mold 37 in the process of forming a molding space, (In the direction of the center of the upper mold).

The inner lower end of the vertical sliding part 17b is the lower side of the inner surface defining the inner space formed by the vertical sliding part 17b. The convex portion 17d is not engaged with the lower surface 17c of the vertical sliding portion 17b but is formed with a diameter smaller than the diameter formed by the vertical sliding portion 17b as a whole, .

As a result, the lower surface 17c of the vertical sliding part 17b corresponds to a part of the molding space s which is exposed to the molding space s to seal the molding space s, as shown in FIG.

4, when the upper forming mold 17 is inserted into the lower molding mold 37, the inner surface of the lower molding mold 37 and the inner surface of the vertical sliding portion 17b And the outer surface of the convex portion 17d seal the molding space.

The lower surface 17c of the vertical sliding part 17b corresponds to a part of the forming space s and the upper surface of the horizontal sliding part 17b is integrally coupled to the upper surface of the vertical sliding part 17b. The steam hole 17e is vertically extended from the other side of the horizontal coupling portion 17a to the lower surface 17c of the vertical sliding portion 17b because the other side portion of the vertical sliding portion 17a can be exposed to the outside, Can be formed.
Here, the steam hole is generally formed in the body (convex portion) of the upper forming mold and / or the lower forming mold to ensure the quality of the molding in the molding space s. However, in the present invention, A steam hole 17c is formed in the vertical direction from the other side of the horizontal coupling portion 17a to the lower surface 17c of the vertical sliding portion 17b. As a result, a steam hole is effectively provided at the edge portion of the molding space (s), and molding quality can be assured at the edge portion of the molded article.

In order to form the steam hole 17e, the other side of the horizontal coupling portion 17a needs to be kept in an exposed state without being contacted by the upper replacement plate 15. [ Therefore, the upper replacement plate 15 is partially engaged with only the outer side of the horizontal coupling portion 17a, that is, one side portion, and the portion corresponding to the upper side of the other side portion, that is, the upper side of the vertical sliding portion 17b, Should be exposed.

Specifically, the other end of the upper replacement plate 15 is in contact with only one side of the horizontal coupling portion 17a, the other side of the horizontal coupling portion 17a is exposed, A steam hole 17e is formed in the vertical direction from the exposed portion of the vertical sliding portion 17a to the lower surface 17c of the vertical sliding portion 17b.

The steam holes 17e can be easily formed in the upper forming mold 17 so that the lower surface 17c of the vertical sliding portion 17b can be exposed to the molding space s. And the portion of the other side of the horizontal coupling portion 17a, that is, the upper side of the vertical sliding portion 17b, can be exposed without being contacted by the upper replacement plate 15. [

The lower mold 37 is not directly fastened to the lower fixing plate 33 similarly to the upper molding frame 17 but is fixed to the lower mold 33 through the lower replacement plate 35, And fastened to the fixing plate 33.

Since the lower replacement plate 35 is bolted to the lower fixing plate 33 and is bolted to the lower molding die 37, it is possible to reduce the manufacturing cost of the starting mold, the PILOT die, The lower mold 35 and the lower mold 37 are loosened and removed and the lower mold 37 having a different shape and size is coupled to the lower mold 35 having the appropriate shape and size. By connecting the replacement plate 35 to the lower fixing plate 33, the waving process can be performed.

As a result, it is not necessary to replace all of the lower mold 30 including the starting mold, the PILOT mold, the production mold having a small amount of production or the lower fixed plate 33, and the lower molding frame 37 Only the lower replacement plate 35 having a shape and size that can be fastened to the lower fixing plate 33 and the lower fixing plate 33 can be replaced. Therefore, it has the advantage of saving the cost, time and effort of starting mold, PILOT mold, and mass-production mold with low production volume.

It is preferable that the engaging protrusion 37a is formed on the lower mold 37 so that the inner side of the lower replacement plate 35 and the lower mold 37 can be easily bolted together.

3 and 4, a coupling protrusion 37a protruding outwardly for bolt tightening with the lower replacement plate 35 is formed on the upper outer surface of the lower molding die 37 .

Meanwhile, the lower mold 30 is held by the supporting plate 70 disposed at the lower side. The support plate 70 includes a fixed support plate 71 and a replacement support plate 73.

The stationary support plate 71 corresponds to a portion to be used as it is without replacing the starting mold, the PILOT mold, or the mass-production mold having a small amount of production. A lower fixed plate support 77 is disposed on the upper surface of the fixed support plate 71. The lower fixed plate support 77 maintains the state in which the lower fixed plate 33 is supported.

The fixed support plate 71 has an opening formed therein and allows the replacement support plate 73 to be mounted in the opening. That is, the replacement support plate 73 is disposed at the opening of the fixed support plate 71 and is coupled to the inner side surface of the fixed support plate 71 by bolts to be replaceable and detachable.

Therefore, the replacement support plate 73 is detached and replaced from the fixed support plate 71 when the start mold, the PILOT mold, the mass-production mold having a small amount of production is produced or changed, or the lower portion is opened to replace the lower mold It should be smooth.

A lower mold support 75 for supporting the lower molding mold 37 is mounted on the upper portion of the replacement support plate 73. The lower mold support 75 supports the lower mold 37.

In this way, the support plate 70 is also detachable. With the separable structure, it is possible to smoothly replace the lower mold and the like, , It can save cost, time and effort.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

s: molding space 10: upper mold
11: upper main frame 13: upper fixing plate
15: upper replacement plate 17: upper molding frame
17a: Horizontal coupling portion 17b: Vertical sliding portion
17c: lower surface of the vertical sliding portion 17d:
17e: steam hole 30: lower mold
31: lower main frame 33: lower fixing plate
35: lower replacement plate 37: lower molding frame
37a: engaging projection 51: material injection module
53: eject module 70:
71: fixed support plate 73: replacement support plate
75: Lower mold support 77: Lower support plate support

Claims (5)

In a replaceable foamed foam forming mold,
An upper fixed plate coupled to the upper main frame and having an opening formed in the plate surface;
A lower fixing plate coupled to the lower main frame, the lower fixing plate being opposed to the upper fixing plate and having an opening formed on the plate surface;
An upper molding die installed at an opening of the upper fixing plate;
A lower molding die installed at an opening of the lower fixing plate to form a molding space in a state where the upper molding die is inserted;
An upper replacement plate disposed between the upper fixing plate and the upper molding die, one end of the upper replacement plate being bolted to the upper fixing plate and the other end being bolted to the upper molding die;
And a lower replacement plate disposed between the lower fixing plate and the lower molding die and having one end bolted to the lower fixing plate and the other end bolted to the lower molding die,
Wherein the upper forming die has a downwardly convex shape to be inserted into the lower forming die and includes a horizontal coupling portion in which the other end and one side of the upper replacement plate are in contact with each other, A vertical sliding part that slides on an inner surface of the lower molding die; and a convex part integrally coupled to an inner lower end of the vertical sliding part and protruding inward,
Wherein the molding space is sealed by a lower surface of the vertical sliding portion and an outer surface of the convex portion in a state where the upper forming mold is inserted into the lower molding die,
The other end of the upper replacement plate is brought into contact with only one side of the horizontal coupling portion and the other side portion of the horizontal coupling portion is exposed and the steam is vertically supplied from the exposed portion of the horizontal coupling portion to the lower surface of the vertical sliding portion, Wherein a ball is formed in the mold.
delete delete delete The method according to claim 1,
And an engaging protrusion protruding outwardly for bolt tightening with the lower replacement plate is formed on the upper outer surface of the lower forming mold.

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