KR101779074B1 - a device for fabricating a notch of pipe and a punch for pressing and cutting - Google Patents

Abstract

The press cutting punch according to an embodiment of the present invention forms a plurality of notch grooves in a hollow pipe by upward and downward movements and includes a plurality of notched grooves for pressing and cutting a notch groove, And a second pressure cutting member including a plurality of mutually spaced apart projections for pressing and cutting the other notch groove, wherein the first pressure cutting member and the second pressure cutting member are spaced apart from each other The first pressing cutting member and the second pressing cutting member are fixed to a back member made of a frame or a flat plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe notch groove forming apparatus and a punch notch of a punch for cutting and cutting,

The present invention relates to a pipe notch groove forming apparatus, and more particularly to a pipe notch groove forming apparatus for simultaneously forming a plurality of notch grooves on a side surface of a metal pipe having a predetermined thickness.

Generally, a headrest for supporting a head of a passenger is provided at an upper end of a car seat. The headrest is mounted on a seat by a stay rod, and a plurality of fixed notch grooves are formed in the stay rod to selectively adjust the height of the headrest by selectively fixing and fixing the seat.

Conventionally, the notch groove forming method of the stay rod can be largely divided into a case of machining a stay rod in an inner filled state and a case of forming a stay rod in which a hollow is formed.

First, when molding the stay rod filled with the inside, generally, one end of the stay rod is cut to form a fixed notch groove.

Since the one end of the stay rod is punched and cut in one direction, the size of the notch groove to be machined may not be accurate, and the remaining cutting residues remain in the notch groove, . In addition, there is a drawback that the hollow pipe is heavier than the hollow pipe and the cost rises.

On the other hand, in the case of forming a hollow stay rod, a separate cutting process is further performed in order to process a precise shape through a pressurizing process.

At least two or more than 10 notch grooves should be formed in one stay rod. Repeating the pressing process and cutting process for each notch groove a plurality of times to minimize cutting to form a fine notch groove while increasing the strength There is a disadvantage that the process is complicated and the process time takes a song.

A prior art related to the present invention is Korean Patent Registration No. 10-0489218.

The present invention provides a pipe notch groove forming method that simultaneously forms a plurality of notch grooves in a single process and minimizes damage to the pipe cross section.

In order to accomplish the above object, a press cutting punch according to an embodiment of the present invention has a plurality of notch grooves formed in a hollow pipe by up and down movements, and a plurality of mutually spaced apart And a second pressing cutting member including a plurality of mutually spaced apart projections for pressing and cutting the other notch groove.

The first pressure cutting member and the second pressure cutting member are arranged parallel and spaced apart from each other by a predetermined distance and are constrained to each other to perform up-and-down movement, and notch grooves having mutually different shapes are formed do.

The first pressure cutting member and the second pressure cutting member are fixed to a back member made of a frame or a flat plate.

The plurality of protrusions may be formed upwardly from below along the respective pressure cutting members, and the protrusion length of the protrusions may be increased from the lower side toward the upper side.

Further comprising a third pressure cutting member including a plurality of mutually spaced apart protrusions for pressing and cutting another notch groove, wherein the first pressure cutting member, the second pressure cutting member, and the third pressure cutting member And are arranged so as to be sequentially parallel to each other at regular intervals on the back surface member.

The protruding portions provided in the respective pressure cutting members are formed in the same number with the same interval, and the protruding portions adjacent to each other in one direction of the arrangement direction are characterized in that the protruding length is increased or decreased

On the other hand, each of the pressure cutting members has a configuration in which a plurality of projections are formed on one rod, and the rod can be detachably attached to the back member

On the other hand, it is conceivable that the protruding portions adjacent to each other in one direction of the arrangement direction have a plurality of projections formed on one rod, and that the rod can be detachably attached to the back member.

Alternatively, it is conceivable that each of the protrusions can be detachably attached to the backing member independently.

The lowermost projection of each of the pressure cutting members has an upper surface in a planar shape, and is characterized in that the forming portion of the pipe is first processed in a planar shape.

At least one protrusion provided above the lowermost protrusion includes an uppermost surface in a planar shape and an inclined surface extending from the bottom surface to the uppermost surface and pressing and cutting the formed portion of the pipe according to the shape of the end surface of the protruded portion .

The pipe notch groove forming apparatus according to an embodiment of the present invention basically comprises a lower mold on which a hollow pipe is seated, an upper mold provided on the upper mold and movable up and down with reference to the lower mold, And a press cutting punch which is vertically moved according to the up and down movement of the upper mold.

Here, the pressure cutting punch includes a first pressure cutting member including a plurality of mutually spaced protrusions for pressing and cutting one notch groove, and a plurality of mutually spaced apart protrusions for pressing and cutting the other notch groove Wherein the first pressure cutting member and the second pressure cutting member are arranged parallel and spaced apart from each other by a predetermined distance and are constrained to each other and simultaneously perform up and down movements, And the notch groove is formed.

The lower mold includes a lower fixing plate forming a base, and a lower mold plate provided on the upper portion of the lower fixing plate, wherein the lower mold plate includes a seating groove on which the hollow pipe is seated.

The upper mold includes a guide post extending downward, and the lower fixing plate includes a guide groove for receiving the guide post, and the upper mold is guided by the guide post to perform a vertical movement .

The upper mold includes an upper fixing plate on which the upper portion of the guide post is fixed and a punch fixing plate fixed to a lower portion of the upper fixing plate at a position facing the lower plate, and the pressure cutting punch is fixed to the punch fixing plate do.

The pressing and cutting punch is fixed to a shank extending from the upper surface of the upper fixing plate and penetrating the upper fixing plate and inserted into the punch fixing plate to a predetermined depth.

The shank has a supporting plate extending downward, and the pressing punch is fixed to a frame or a flat plate-shaped backing member made of a rigid body, and the backing member is fixed to the supporting plate.

Further, the lower die plate has an insertion groove in which the cutting members of the pressure cutting punch can be inserted when the support plate is lowered, and the pipe is partly protruded by at least a part of the inside of the insertion groove, .

Meanwhile, the insertion groove forms a debris passage passing through the lower side template and the lower side fixing plate, and discharges debris generated during processing.

The upper mold further includes a movable stripper plate provided below the punch inserting portion, wherein the movable stripper plate is movable up and down relative to the upper fixed plate through a stripper guide rod moving up and down along a guide groove formed in the upper side fixing plate And is installed so as to be movable.

The spring unit may further include a spring portion provided between the movable stripper plate and the upper fixing plate, wherein the spring portion is spaced apart from each other until the movable stripper plate and the pipe seated on the lower mold plate come into contact with each other, State is maintained.

The movable stripper plate fixes the pipe by the elastic force of the spring while the upper mold further descends while the pipe contacts the pipe.

On the other hand, it can be considered that the movable stripper plate includes a urea rubber on the bottom face contacting with the pipe.

And the pressure cutting punch is further lowered in a state where the movable stripper plate fixes the pipe to press and cut the pipe.

The present invention has an effect that a plurality of notch grooves can be machined simultaneously in one process.

More specifically, a plurality of notch grooves can be formed by one up-and-down moving process by providing a plurality of pressure cutting members parallel to one back surface member.

In addition, since the protrusions can be detached from the back surface member in units of rows, rows, and individual units, cost loss due to damage to some protrusions can be minimized.

By increasing the degree of protrusion stepwise, it is possible to effectively prevent a bending phenomenon due to excessive pressing or punching due to excessive cutting.

 Further, from the viewpoint of the molding apparatus, the pressurization and cutting can be performed in a state in which the pipe is fully fixed by the movable stripper plate and the spring, and the machining accuracy can be greatly increased.

 Productivity can also be greatly improved.

1 is a perspective view showing a press cutting punch according to an embodiment of the present invention.
2 is a pipe processed using a press cutting punch according to an embodiment of the present invention.
Fig. 3 is a conceptual diagram showing the detachment and detachment of the press cutting member of the press cutting punch according to the embodiment of the present invention in the column direction (vertical length direction).
Fig. 4 is a conceptual diagram showing the attachment and detachment of a rod in which a plurality of protrusions are formed in a row (width direction ) of a pressure cutting punch according to an embodiment of the present invention.
Fig. 5 is a conceptual diagram showing the attachment / detachment of the protrusion according to the embodiment of the present invention.
6 is an enlarged view showing a shape of a protrusion according to an embodiment of the present invention.
7 is an enlarged view showing a notch groove of a pipe processed using a pressure cutting punch according to an embodiment of the present invention.
8 is a graph showing the operating relationship of the pre-press forming apparatus in a state in which the press cutting punch is fastened according to an embodiment of the present invention.
Fig.
FIG. 9 is a cross-sectional view illustrating a state in which after the pressure cutting punch according to the embodiment of the present invention is lowered,
Fig. 3 is a schematic view showing the operation of the molding apparatus in a state where it is held
FIG. 10 is a cross-sectional view showing a state in which a press cutting punch according to an embodiment of the present invention forms a hollow pipe notch groove,
Is a schematic view showing the operation of the molding apparatus in the lowered state

Hereinafter, embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The press-fitting punch according to the present invention forms a plurality of notch grooves in the hollow pipe by upward and downward movement.

As shown in Fig. 1, the pressure-bonded punch basically includes a plurality of projections on a plane, and a plurality of projections are formed in rows and columns. One row is lowered to form a notch groove.

Any row including a plurality of mutually spaced protrusions for pressing and cutting one notch groove is referred to as a first pressure cutting member. For convenience, the heat provided at the left end will be referred to as first pressing cutting members 1a to 8a. It is to be understood that this is merely for explanation of the embodiment, and it is a matter of course that each row can be the first pressure cutting member.

And a second pressing cutting member including a plurality of mutually spaced apart protruding portions for pressing and cutting the other notch groove. The heat provided on the right side of the first pressure cutting members 1a to 8a (seven protrusions) is referred to as the second pressure cutting members 1b to 8b (seven protrusions) for convenience. This is also only for the explanation of the embodiment, and it goes without saying that each row except for the first pressure cutting member can be the second pressure cutting member.

The first pressure cutting member and the second pressure cutting member mean different rows, and the first pressure cutting member and the second pressure cutting member are arranged parallel and spaced apart from each other. As shown in FIG. 1, they are constrained to each other, and concurrently, up and down movements are simultaneously performed, and notch grooves having different shapes are formed at the same time.

The first pressure cutting member and the second pressure cutting member are preferably fixed to a back surface member 21 made of a frame or a flat plate. In FIG. 1, a plurality of pressure cutting members are formed in the back surface member 21 of a flat plate shape, and it is also possible to consider that they are mutually fixed through a frame, not a planar shape.

On the other hand, it is preferable that the plurality of protruding portions are formed upwardly from below along the respective pressure cutting members, and the protruding length of the protruding portions increases from the lower side to the upper side. This is to perform stepwise pressing and cutting as the pressure cutting member descends.

If the protruding length is not gradually increased, the hollow pipe is appropriately pressurized, so that it is possible to make a hole in the notch groove by excessive cutting due to the back face member 21, and even if the pressurization is sufficiently performed, There is a possibility that the cross-sectional shape of the pipe can not be maintained. Therefore, by gradually increasing the length of the projecting portion, appropriate pressing can be induced at each step, and excessive cutting can be prevented at the same time.

On the other hand, it may be considered to include a third pressing cutting member including a plurality of mutually spaced apart projections for pressing and cutting another notch groove. For convenience, the right row of the second pressure cutting member is referred to as a third pressure cutting member 1c to 8c. This is merely for convenience, and any of the pressure cutting members except for the first pressure cutting member and the second pressure cutting member can be the third pressure cutting member.

The first pressure cutting member, the second pressure cutting member, and the third pressure cutting member are preferably arranged on the back surface member 21 so as to be sequentially parallel to each other at regular intervals.

On the other hand, it is preferable that the protrusions provided on the respective pressure cutting members are formed in the same number and the same interval, and that the protrusions adjacent to each other in one direction (left or right) in the arrangement direction (width direction) Or may be considered to be reduced. It is preferable to apply the case where the depth of the notch groove gradually increases or decreases.

3 shows detachment and attachment of the pressure cutting member in the form of a plurality of protrusions formed on one rod in the column direction. It is possible to consider the attachment and detachment to / from the back surface member 21 through the groove corresponding to the shape of the cutting member rod R as shown in Fig. It is possible to fix the cutting member rod R through a bolt or the like at the rear surface of the back member 21 and to fix the cutting member rod R with a rail which can be slidably restrained by the grooves R and the grooves. In this case, since there is a degree of freedom in the sliding direction, it is preferable to finally provide a bolt, a stopper or the like and fix it completely.

On the other hand, Fig. 4 shows that the protruding portions mutually adjacent in the width direction are formed on one cutting member rod C in the row direction, and the cutting member rod R is detachably attached to the back member 21. Fig. That is, the protruding portion constituting one row is formed on one cutting member rod C, and the whole can be attached to and detached from the rear member 21. As in the case of Fig. 3, it can be fixed through bolts, rails or the like.

On the other hand, Fig. 5 shows that each protrusion can be detachably attached to the backing member 21 independently. As shown in Fig. 5, each of the projections can be detached from the rear member 21 forwardly. When fixing the bolts, it is possible to consider fixing the bolts from the rear surface of the back member 21.

As described above, Figs. 3 to 5 illustrate the attachment and detachment of protrusions that can be made in various forms. As the pressing and cutting processes are repeated, there is a possibility that one of the projections is damaged. When the entire protrusion is integrally formed as shown in FIG. 1, if the protrusion is damaged, it is necessary to replace the entire cutting member. In order to solve such a problem, it is preferable that the protrusion can be attached and detached as shown in FIG. 3 to FIG.

On the other hand, as shown in Fig. 1, it can be considered that the lowermost projection of each pressure cutting member has a planar upper surface. The lowermost projection is for flattening the molded part of the pipe having a circular cross-section, and is for efficient pressing and cutting at a later stage. It is preferable that the entire upper surface of the protruding portion is formed in a planar shape so that a part of the periphery of the molded portion to be notched on the pipe is first processed in a planar shape.

6, the projection provided on the uppermost side of the lowermost projection includes an uppermost surface 24 in a planar shape and an inclined surface extending from the bottom surface 22, 23 to the uppermost surface 24, The forming portion of the pipe is pressed and cut according to the shape of the pipe. Here, the inclined plane means a plane between the respective corners (25, 26, 27, 28). In FIG. 6, four trapezoidal inclined planes are shown, but an annular planar inclined plane can be considered. Fig. 7 shows notched grooves n1 and n2 finally formed by using protrusions including inclined surfaces. In Fig. 6, the top surface 24 is offset to one side, and the apex of the notch groove is biased to one side will be. That is, the shape of the notch groove is determined according to the shape of the protrusion.

In the foregoing, a press-cutting punch according to some embodiments of the present invention has been described. Hereinafter, a general apparatus for performing a pipe notch groove forming process using such a pressure cutting punch will be described.

The pipe notch groove forming apparatus according to an embodiment of the present invention includes a lower mold L on which a hollow pipe 10 is seated, an upper mold U (not shown) provided on an upper portion of the lower mold, ).

In general, the upper mold performs up and down movement while the lower mold is fixed, but the opposite can also be considered.

The press-fitting punch is fixed to the upper mold (U) when the upper mold (U) performs up and down movements and is moved up and down according to the up and down movements of the upper mold (U).

The lower mold L includes a lower fixing plate 100 forming a base and a lower mold plate 110 provided at an upper portion of the lower mold clamping plate 100. The lower mold plate 110 includes a hollow pipe 10 are seated. The seating groove 111 is for fixing the pipe 10 in the molding process, and a part of the lower side plate 110 is recessed in a pipe shape or a separate molding to be recessed in a pipe shape is attached to the lower side plate 110 Can be considered. The upper portion of the pipe 10 is pressed by the movable stripper plate 210 to be described later, and the pipe is fixed to the lower side mold plate 110.

The upper mold U includes an upper fixing plate 200 and a guide post 300 extending downward from the upper fixing plate 200. The lower fixing plate 100 includes a guide groove 320 for receiving the guide post 300. The upper mold is guided by the guide post 300 to perform up and down movement.

It is also possible that the guide post 300 extends to the upper side of the lower mold L and the guide groove 320 is provided in the lower fixing plate 100. [

The upper mold U includes an upper fixing plate 200 to which the upper portion of the guide post 300 is fixed and a lower fixing plate 200 fixed to a lower portion of the upper fixing plate 200 at a position facing the lower flat plate 110. [ And a fixing plate 230. The press cutting punch 20 is fixed to the punch fixing plate 230. [

More specifically, the press cutting punch 20 is fixed by a shank 220, and the shank 220 extends from the upper surface of the upper fixing plate 200, passes through the upper fixing plate 200, As shown in FIG. The press cutting punch 20 is engaged with the thus inserted end portion.

The press cutting punch 20 is directly coupled to the lower end of the shank 200 and the press cutting punch support plate 35 in the form of a separate flat plate extending downward from the end is provided, It is also conceivable that the press cutting punch 20 is fixed to the support shaft 35.

In this case, the shank 220 has a downwardly extending press cutting punch support plate 35, and the press cutting punch 20 includes a backing member 21 made of a rigid body or a flat plate having a constant area , The back surface member 21 is fixed to the press cutting punch support plate 35. [ It is conceivable to additionally provide a separate pressure cutting punch support plate 35 on the rear surface of the backing member 21 in order to increase the support strength of the pressure cutting punch.

The lower die plate 110 has an insertion groove H into which the pressure cutting punch 20 and the press cutting punch support plate 35 can be inserted when the lower die plate 110 is lowered, At least a part of which protrudes, and a part of the protruding part abutting the pressure cutting punch is molded.

Meanwhile, the insertion groove H may form a debris passage passing through the lower mold 110 and the lower mold 100, and the debris generated during the process may be discharged downward.

The upper mold may further include a movable stripper plate 210 provided below the punch fixing plate 230.

The movable stripper plate 210 is vertically movable relative to the upper stationary plate 200 through a stripper guide rod 260 which moves up and down along guide grooves formed in the upper stationary plate 200.

And the spring unit 270 may be disposed between the movable stripper plate 210 and the upper fixing plate 200. The spring unit 270 may include a movable stripper plate 210, And the pipes 10 mounted on the lower mold 110 maintain their mutual spacing as shown in FIG. 8 until they come into contact with each other. On the other hand, the movable stripper plate 210 is preferably provided with a urea rubber on the lower surface contacting the pipe so that the pipe is not damaged or moved.

The upper side of the lower template 110 is provided with a guide part 120 protruding upward to guide the lowering of the movable stripper plate 210. The movable stripper plate 210 is fixed to the guide part 120, So that side sliding of the movable stripper plate 210 can be prevented.

9, the spring unit 270 serves to fix the pipe 10 by an elastic force during the further lowering of the upper mold in a state where the spring unit 270 is in contact with the pipe 10 as shown in FIG. .

In this way, the movable stripper plate 210 further moves down the press-fitted / bonded punches in a state where the pipe 10 is fixed, thereby pushing and cutting the pipe.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

U: Upper mold
L: Lower mold
10: pipe
11 to 17, n1 to n2 : notch groove
20: Press cutting punch
21: rear member
22, 23:
24: Top surface
25, 26, 27, 28:
32: punch inserting portion
33: protrusion
35: Press cutting punch support plate
100: lower side fixing plate
110: Lower side template
111: seat groove
120: guide portion
130: Guide fastening bolt
140: Lower fixing plate fastening bolt
200: Upper side fixing plate
205: Support plate
210: movable stripper plate
220: Shank
230: punch fixing plate
260: Stripper guide rod
270: spring portion
300: Guide post
320: Guide groove
H: Insert groove
R: cutting rod (column direction)
C: cutting member rod (row direction)
n1, n2: Notch groove

Claims (15)

A press cutting punch for simultaneously forming a plurality of notch grooves in a hollow pipe by vertical movement,
A first pressure cutting member including a plurality of mutually spaced protrusions for pressing and cutting one notch groove;
A second pressing cutting member including a plurality of mutually spaced apart projections for pressing and cutting the other notch groove; And
A third pressure cutting member including a plurality of mutually spaced apart projections for pressing and cutting another notch groove; , ≪ / RTI &
The first pressure cutting member and the second pressure cutting member are arranged parallel and spaced apart from each other by a predetermined distance, are mutually restrained and simultaneously move up and down, and can form notched grooves having different shapes,
The protrusions provided on each of the pressure cutting members,
And are formed at equal intervals with the same number,
The projecting portions neighboring each other in one direction of the arrangement direction have an increased or decreased projection length,
Wherein each of the pressure cutting members has a shape in which a plurality of protrusions are formed on one rod, and the rod is detachably attachable to the backing member.
delete The method according to claim 1,
Wherein the plurality of projections
And the protruding length of the protruding portion is increased from the lower side to the upper side along the respective pressure cutting members.
delete delete delete delete delete The method according to claim 1,
And the lowermost protrusion of each pressure cutting member has a flat upper surface.
The method according to claim 1,
At least one protrusion provided on the upper side of the lowermost protrusion of the plurality of protrusions,
And a sloped surface extending from the bottom surface to the top surface. ≪ RTI ID = 0.0 >
A lower mold on which the hollow pipe is seated;
An upper mold provided on the lower mold and movable up and down with respect to the lower mold;
A press cutting punch fixed to the upper mold and moved up and down according to the up and down movement of the upper mold;
/ RTI >
The press cutting punch includes:
A first pressure cutting member including a plurality of mutually spaced protrusions for pressing and cutting one notch groove;
And a second pressure cutting member including a plurality of mutually spaced apart projections for pressing and cutting the other notch groove,
The first pressure cutting member and the second pressure cutting member are arranged parallel and spaced apart from each other by a predetermined distance, are mutually restrained and simultaneously move up and down, and can form notched grooves having different shapes,
The lower mold includes a lower fixing plate forming a base, and a lower mold provided at an upper portion of the lower fixing plate,
Wherein the lower mold plate includes a seating groove on which the hollow pipe is seated,
The upper mold includes a downwardly extending stripper guide post,
Wherein the lower fixing plate includes a guide groove for receiving the guide post,
The upper mold is guided by the guide post to perform a vertical movement,
The upper mold includes an upper fixing plate on which an upper portion of the stripper guide rod is fixed and a punch fixing plate fixed on a lower portion of the upper fixing plate at a position facing the lower mold plate,
Wherein the pressure cutting punch is fixed to the punch fixing plate,
Wherein the pressure cutting punch is fixed to a shank extending from an upper surface of the upper fixing plate and passing through the upper fixing plate and inserted into the punch fixing plate to a predetermined depth.
delete 12. The method of claim 11,
The shank has an upper fixing plate extending downward and a supporting plate extending downward from the upper fixing plate
The pressure cutting punch is fixed to a backing member which provides a frame of a certain area,
Wherein the back surface member is fixed to the support plate and the punch fixing plate.
14. The method of claim 13,
Wherein the lower die plate has an insertion groove into which the press cutting punch and the support plate can be inserted when the lower die plate is lowered,
The pipe at least partially protrudes inside the insertion groove to form a part of the protruding portion,
Wherein the insertion groove forms a debris passage passing through the lower mold plate and the lower mold plate and discharges debris generated during the process.
12. The method of claim 11,
The upper mold includes:
And a movable stripper plate provided below the punch inserting portion,
The movable stripper plate is installed to be movable up and down relative to the upper side fixing plate through a stripper guide rod moving up and down along a guide groove formed in the upper side fixing plate,
Further comprising a spring portion provided between the movable stripper plate and the upper fixing plate,
The spring portion maintains a state where the movable stripper plate and the pipe seated on the lower mold plate are spaced apart from each other until the upper mold is lowered,
The movable stripper plate is pressed against the elastic force of the spring during the further descent of the upper mold in a state where the movable stripper plate is in contact with the pipe
The pipe is fixed to the pipe,
Wherein the pressure cutting punch is further lowered in a state where the movable stripper plate fixes the pipe to press and cut the pipe.

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