KR101210259B1

KR101210259B1 - Side core material system of tube style subject matter hot forming press mold

Info

Publication number: KR101210259B1
Application number: KR1020100094104A
Authority: KR
Inventors: 김용식
Original assignee: 주식회사 화신테크
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2012-12-10
Also published as: KR20120032658A

Abstract

The present invention is a molding mold for pressing a tubular material (pipe) to produce a press-molded product, the upper side of the side core is injected into both ends of the tubular material in order to form a shape having an inner space formed at both ends of the tubular material By absorbing the pressure and impact of the core, it is possible to prevent the pressure and shock from being transmitted to the core operation cylinder driving the side core, so that the side core can operate smoothly and the endurance life of the core operation cylinder driving the side core can be extended. The present invention relates to a side core forming apparatus of a press mold for hot forming of a tubular material, and more particularly, having a molding shape at both ends of a tubular material, having a side core and a clearance at one side of a side core fed into the tubular material, and pressing the side core to a pressure plate. Fixed to the center of the side core Combining the fixing cover to bolt the pressure plate to the pressure plate, the rod of the core operation cylinder to the other side, the lower side of the pressure plate and the fixed cover and the guide rail and the core operation cylinder is coupled to one side When the side core forming device is inserted into the tubular processing material, the center of the side core forming device is changed so that the center of the processing material, that is, the periphery of the side core forming device can be simultaneously brought into contact with the inner surface of the processing material. This prevents intensive wear of a specific part of the side core forming apparatus and extends the life of the driving unit by not transmitting the load to the core operation cylinder, thereby obtaining a side core forming apparatus of a press mold for hot forming of tubular material with high durability. It can be effective.

Description

Side core material system of tube style subject matter hot forming press mold}

The present invention relates to a side core forming apparatus of a press mold for hot forming processed into a tubular material, and more particularly to a hot forming mold for pressing a tubular material (pipe) to produce a press molded product. In order to form a shape having an inner space formed, the side cores injected at both ends of the tubular material absorb the pressing force and impact of the upper mold so as not to transmit the pressing force and impact to the cylinder driving the side core. It works well and extends the service life of the cylinder that drives the side cores.

In general, it is well known that heating a metal material weakens its mechanical strength and reduces deformation resistance, so that it can be processed and molded with a small force.

In addition, products manufactured by press forming are generally manufactured by using metal plate material, but recently, tubular materials such as pipes are heated according to the required functions of the manufactured products to improve moldability. Press molds are also used to process products.

Products manufactured using the tubular material are also various, and products having a hollow portion at both ends of the tubular material should be molded by inserting a side core into the tubular material.

In general, in a press molding mold, a molding material is pressed between an upper mold and a lower mold, and the material is molded into a shape of an upper mold or a lower mold. To form a shape having a hollow portion at both ends using a tubular material, After inserting into the tubular material, the upper mold and the lower mold are pressed tightly so that the tubular material is positioned between the outer side of the side core and the upper and lower molds so that both ends of the material are formed into a tubular shape, or the upper mold and After forming the space portion so that the lower mold is not pressurized so as not to be molded, or the pressurization amount is made small to form unfinished, the side core is introduced into the tubular material to complete the molding.

An example of an article manufactured by using a tubular material and press-processed as described above may be an example of a torsion beam, which is a rear wheel suspension system of an automobile. In the present invention, a torsion beam will be described as an example.

As noted above, the torsion beam is a major component of the suspension system that connects the vehicle body and the wheels. The torsion beam is welded to the trailing arms at both ends of the torsion bar, and the wheels, springs, shock absorbers, etc. The torsion beam is composed of a suspension system, and the torsion beam absorbs the bending due to the centrifugal force generated during the turning of the vehicle, the impact of the rough road surface and the torsion caused by the rolling of the vehicle. It requires rigidity.

Conventionally, the torsion beam having the above function is manufactured by pressing to have a cross section of ∧, ∩, etc. using a thick steel plate, and the torsion beam satisfies the torsion bar and endurance strength to satisfy the torsional rigidity or the bending stiffness. It is manufactured to have sufficient torsion and bending strength by welding the reinforcing plate separately to the torsion beam and integrating it. However, this increases the manufacturing cost due to the large number of parts and requires a multi-stage manufacturing process, resulting in a decrease in productivity. It has been pointed out that the defect rate increases due to thermal deformation and deterioration of dimensional accuracy.

Therefore, in recent years, the torsional rigidity required by the torsion beam is required by improving the conventional drawback as described above to heat the tubular material and hot forming it into a press mold to have a desired cross section so that the torsion beam body is formed in two layers to have a high tensile strength. In addition, a method of manufacturing a torsion beam using a tubular material to satisfy bending rigidity has been proposed and used.

As an example of manufacturing a torsion beam using the tubular material, Korean Patent Registration No. 0797370 (Method for manufacturing a tubular torsion beam axle and a torsion beam manufactured by the method) and Korean Patent Registration No. 0907225 (Hot forming apparatus and hot forming manufacturing method) ).

The pre-registered invention proposes a method of manufacturing a torsion beam from a tubular material, which is a preformed molding of a tubular material using a press mold. In order to form the desired shape in the inside, the tubular material of the circular cross section, which has been heated in the heating furnace, is transferred to the mold and placed on the upper surface of the lower mold, and both ends of the upper mold are formed in order to first mold both ends of the tubular material. Lower the upper punch to be positioned to form both ends of the pipe of the circular cross section into a rectangular cross section, and then to form the remaining portions except the both ends of the pipe and maintain the shape of both ends of the tubular material having the rectangular cross section. In both ends of the pipe By injecting the mandrel and forming the main body, the rectangular cross sections of both ends of the pipe can be maintained as they are even though the remaining part of the pipe is molded.

In addition, according to the mold and processing embodiments performed in Korean Patent Registration No. 0907225, the cam cylinder is inserted into both ends of the torsion beam material by driving the cam cylinder after the torsion beam material of the metal forming the pipe shape is seated in the lower mold. The upper mold is coupled to the lower mold by pressing the base cylinder and pressed to form a torsion beam.

As described above, in order to form the torsion bar, a mandrel or a cam (hereinafter referred to as a side core) is required to shape both edges of the torsion bar having a shape different from that of the main body, and the side core is operated by the upper mold. Since the upper mold and the lower mold are combined and pressed before both ends of the tubular material, the cam is subjected to the pressing force of the upper mold while being sandwiched between the upper mold and the lower mold, which is transmitted to the cylinder rod driving the side core and the cam. The durability of the cylinder and cam will be reduced.

In other words, the torsion beam having the tubular material is formed in the shape of the center and both ends in the longitudinal direction as shown in FIG.

In other words, the semi-circular surface is formed in two layers in close contact with the semi-circular surface on the other side, so that the torsional rigidity is excellent, and both ends are secured with a wider welding surface during welding with the trailing arm so that the bending rigidity is excellent. It is molded to have a body portion and both ends have a transition portion so that its shape is naturally changed and connected.

Therefore, when processing a torsion beam using a press mold, unlike the middle portion of the torsion beam, both ends are molded into a tube shape having a hollow portion therein, so that the patent registration No. 0797370 separates the upper mold into multiple stages to precede both ends. It is configured to prevent deformation of both ends of the preformed torsion beam by inserting a side core formed in both ends of the torsion beam formed in the same shape as both ends of the torsion beam and molding the center portion of the torsion beam.

In addition, the patent registration No. 0907225 puts the torsion beam material in the lower mold and drives the core operation cylinder to inject the side core into both ends of the torsion beam and drives the base cylinder to press the upper mold to the lower mold to press the shape. The center portion and both ends of the different torsion beams are formed at the same time, wherein the side cores are input to both ends of the torsion beam to support the inside.

Therefore, the center portion of the torsion beam is sandwiched between the upper mold and the lower mold, and both ends are formed by the upper and lower molds and the side cores.

As described above, both the former and the latter are pressurized by the upper mold and the lower mold while the side cores are injected to both ends of the torsion beam to form the torsion beam, which is sandwiched between the upper mold and the lower mold. As a result, the pressing force of the upper and lower molds is transmitted to the side core and the core operation cylinder driving the same, thereby causing damage to the core operation cylinder, resulting in a decrease in durability.

In other words, if the center of the side core is not located exactly between the upper mold and the lower mold, the cam and the cam cylinder rod are pressed by the pressing mold and bent by the pressing force of the mold. Therefore, the damage is increased and the side core is not directly pressed by the mold. Even if not, the load of the torsion beam, which is shaped by the mold and deforms, is transmitted to the rod of the side core and the core operating cylinder, causing damage to the side core and the core operating cylinder.

Therefore, in the mold for processing the torsion beam, more specifically in the mold for processing the tubular material there is a problem that the durability of the mold is reduced by causing damage to the side core and the core operation cylinder.

Patent Registration No. 0797370 Patent Registration No. 0907225

The present invention is located between the upper mold and the lower mold in close contact with the conventional mold for processing the tubular material as described above to solve the problem of damage to the side core and the core operation cylinder is installed to form both ends of the tubular material. Excellent durability of the mold by preventing the side core and the core operation cylinder from being damaged by allowing the side core to change its center irrespective of the core operation cylinder so that the pressing force and impact of the upper mold are not transmitted to the core operation cylinder. It is an object of the present invention to propose a side core forming apparatus of a press mold for hot forming a tubular material having excellent dimensional accuracy of a workpiece formed by the side core by allowing the side core to enter the center of the tubular material. .

As a technical idea for achieving the above object, the present invention has a side shape of the both ends of the tubular material and is introduced into the tubular material;

A fixing cover having a clearance with the side core on one side of the side core and fixing the side core to the pressure plate to allow the center position of the side core to flow;

A pressure plate whose one surface is in close contact with the rear surface of the side core and is coupled to the fixed cover and to which the rod of the core operating cylinder is coupled to the other side;

Fixture coupled to the lower side of the pressure plate and the fixed cover and the guide rail and the core operation cylinder is coupled to one side;

The side core is characterized in that flowing in all directions from the inside of the fixed cover.

In the present invention as described above, the center of the side core forming apparatus when the side core forming apparatus is introduced into the tubular workpiece, the center of the workpiece, that is, the circumference of the side core can be in contact with the inner surface of the workpiece at the same time This can be changed and introduced to prevent the intensive wear of a specific part of the side core to extend the endurance life of the side core forming apparatus and the side by the shape of the vertical core and the side core transferred to the side core forming apparatus by the upper mold One side of the core comes into contact with the workpiece first to form the workpiece and at the same time, the load transferred to the side core forming device by reaction is not transferred to the core operation cylinder, which extends the life of the drive unit, resulting in hot forming of tubular material with excellent durability. The effect of obtaining the side core forming device of the press mold .

1 is a perspective view showing a torsion beam molded using a tubular material according to an embodiment of the present invention;
2 is a cross-sectional view showing the cross-sectional shape of each part of FIG.
3 is a cross-sectional view showing the configuration of the present invention;
4 is a cross-sectional view showing an embodiment of the present invention;
Figure 5 is a cross-sectional view showing an embodiment of the operation of the side core according to the guide rail installed inclined,
6 is a cross-sectional view illustrating a positioning example of a side core forming apparatus at the time of forming by contacting a side core forming apparatus, which is a side forming tool of the present invention, with a tubular material;
7 is an exemplary view showing a mold to which the present invention is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, terms to be described below are terms defined in consideration of their functionality in the present invention, which may vary according to intentions and customs of users and field operators, and the definitions of these terms should be made based on the general contents of the present specification. Put it.

In addition, the side core molding apparatus of the present invention is formed on both sides of the lower mold portion of the lower mold to support the tubular material between the upper mold and the lower mold that is pre-injected into the tubular material to press the molded or formed both ends or to the upper mold and the lower mold Also by post-injection into both ends of the unmolded tubular material to form both ends of the tubular material.

Therefore, the tubular material of which the shape is not complicated and the processing load is not large can be applied to cold working at room temperature, which can be selected according to the processing conditions such as the shape of the manufactured product or the material and thickness of the processed material. It will be appreciated that the material cooling means may be provided in the upper, lower molds and the side core apparatus of the present invention.

7 shows a press mold using the tubular material of the present invention.

That is, the present invention is divided into an upper mold (6) and a lower mold (601), the bottom of the upper mold 6 and the upper surface of the lower mold (601) is formed in the molded part (6a) (601a) and the lower mold ( Side core forming apparatus (a) is configured on both sides of 601.

In the above, the side core forming apparatus (a) forms a supporting plate 101 having an outer diameter extending on the other side of the protruding portion of the shaped protrusion 102 having a shape of a product which protrudes on one side, and the shaped protrusion 102 and the supporting plate ( A side core 1 having a support jaw 103 at the boundary of 101;

A fixing cover (2) having an operating hole (201) in the inner side to form a device groove (202) on the other side and a locking step (203) at the boundary between the operating hole (201) and the device groove (202);

A pressing plate 5 coupled to the fixing cover 2 and the bolt 7 and coupled to the rod of the core operation cylinder 4 on the rear side thereof;

A fixture 3 having a core actuating cylinder 4 coupled to the rear side and a bottom surface thereof coupled to the lower mold 601 and having a guide rail 302 on one side thereof;

.

The present invention as described above is to protrude outwards through the shape hole 102 of the side core 1 through the operating hole 201 of the fixing cover 2 to the base plate 101 inside the device groove 202 The side core 1 and the pressure plate 5 and the fixing cover 2 are simultaneously coupled by putting the pressure plate 5 and the fixing cover 2 into the bolts 7 by inputting them.

In addition, the lower surface of the pressing plate 5 and the fixing cover 2 is combined with the guide rail 302 of the fastener 3 so that the side core 1, the pressing plate 5 and the fixing cover 2 are simultaneously guide rails 302. Forwards and backwards.

In the above, the operation hole 201 and the device groove 202 formed in the fixed cover 2 are slightly larger than the circumference of the base plate 101 and the shape protrusion 102 which are introduced into the inner side, thereby forming a side core ( 1) is formed so that the position flows in all directions from the fixing cover (2).

In the above, the device groove 202 and the support plate 101 are formed in the shape of a square or an ellipse to prevent the side core 1 from rotating.

On the other hand, the rod of the core operating cylinder 4 is coupled to the rear side of the pressure plate 5 and the core operating cylinder 4 is coupled to the fixture 3 coupled to the lower mold 601.

Accordingly, when the core operation cylinder 4 is driven, the cylinder rod pushes or pulls the pressure plate 5 and the fixed cover 2, and the pressure plate 5 and the fixed cover 2 flow along the guide rail 302. will be.

In the above, when the side core 1 is put into operation after the upper and lower molds 6 and 601 are operated, the tubular material is molded along the shape of the side core 1 by the pressing force of the side core 1. The lower mold (6) 601 supports the side core (1) from the outside of the tubular material.

In the above, the support plate 101 flows inwardly from the inside of the device groove 202, so that when one side comes into contact with the inner surface when the shape protrusion 102 of the side core 1 is introduced into the tubular material, the side core first (1) means that the center of the tubular material is moved to the opposite side of the contact surface, and the opposite side is in contact with the inner surface of the tubular material, the center of which is fixed by the tubular material and at the same time the tubular material is the side core by the pressing force of the side core (1). It is molded along the shape of (1).

In addition, when the upper and lower molds are operated after pre-injecting the side core 1 to both ends of the tubular material, the side core 1 supports the upper and lower molds 6 and 601 inside the tubular material to form the tubular material. It is molded, but the space is formed between the lower surface of the tubular material and the lower mold (601) or the bottom surface of the side core (1) and the inner surface of the tubular material, the side core (1) by the upper mold (6) to press Even when pressurized, the center of the side core 1 flows downward and is molded so that the pressing force is not transmitted to the core operation cylinder 4 driving the side core 1.

That is, the contact surface of the support plate 101 and the pressure plate 5 of the side core 1 is simply horizontally contacted to push the support plate 101 or pull the fixing cover 2 so that the side core 1 operates forward and backward. When the side core 1 flows to the side, sliding occurs between the support plate 101 and the pressure plate 5 so that the side loads generated in the side core 1 drive the pressure plate 5 and the pressure plate. It is not delivered to (4).

Meanwhile, as shown in FIG. 5, the side core 1 may be equipped with a guide rail 302 for guiding the fixing cover 2 and the pressure plate 5 to have a predetermined inclination so that the rear side is higher and the height thereof is lowered. If the upper surface of the shape protrusion 102 of the side core 1 is in contact with the tubular material in a state in which there is no clearance formed at the lower side due to the self-weight of the side core 1, the side core must flow downward, but the clearance Since the bottom surface of the shape protrusion 102 is always in contact with the end of the tubular material first and then moves forward, the side core 1 is raised and introduced into the tubular material.

The height step (b) according to the inclination amount of the guide rail in the above range of the clearance formed between the side core 1 and the fixed cover 2, that is, the side core 1 flows from the fixed cover 2 Naturally, it is formed in the range which becomes.

In addition, the present invention may be coupled between the outer periphery of the base plate 101 and the device groove 202 through the elastic piece 9 having elasticity such as a spring or urethane block as shown in FIG. In order to prevent sag caused by its own weight and to always flow in all directions, the side core 1 is positioned at the center of the fixed cover 2.

Therefore, it is satisfactory if the side core 1 is located at the center of the fixing cover 2 by being installed at both the lower side of the support plate 101 supporting the weight of the side core 1 and not having the restoring force. It is preferable to install uniformly around the support plate 101 so that 1) does not deviate in any one direction.

a: side core forming apparatus 1: side core
101: support plate 102: shape protrusion
103: base jaw 2: fixed cover
201: operator 202: device groove
203: engaging jaw 3: fixture
301: support plate 302: guide rail
4 core operating cylinder 5 pressure plate
6: upper mold 601: lower mold
6a, 601a: Shaped part 7: Bolt
8: tubular material 9: bullet pieces

Claims

The core operating cylinder 4, which is divided into an upper mold 6 and a lower mold 601, and operates a side core 1 and a side core 1 that are introduced into the tubular material on the side of the lower mold 601. In a press molding mold for molding a tubular material with a side core molding device (a);
The side core forming apparatus (a) has an operation hole 201 centered on a side core 1 having a support plate 101 whose outer diameter is expanded on the other side of the shape protrusion 102 having a shape of a product protruded and molded on one side. And the support plate 101 into the device groove 202 so that the shaped protrusion 102 protrudes outward through the operation hole 201 to the fixing cover 2 having the device groove 202). Combining the combined pressure plate 5 and the fixing cover 2 with the bolt (7), the operation hole 201 and the device groove 202 is formed to be larger than the circumference of the base plate 101 and the shape protrusion 102 The side core 1 is positioned in all directions within the fixing cover 2 by forming a gap between the support plate 101 introduced into the ball 201 and the device groove 202 and the outer circumference of the shape protrusion 102. Is configured to flow, and the device groove 202 and the support plate 101 is formed in a square or oval shape of the side core (1) to rotate It is configured to support,
The pressing plate 5 and the fixing cover 2 are configured to be operated forward and backward along the guide rail 302 formed on one side of the fixture 3, but the guide rail 302 is higher in the rear side and higher in the forward direction. Is installed to have a lower slope,
Side core forming apparatus of the press-mould for the hot-shaped tubular material, characterized in that it comprises a configuration between the outer peripheral circumference of the support plate 101 and the device groove 202 having elasticity.

delete

The method of claim 1,
Said coal piece (9) is a side core forming apparatus of a press mold for hot-formed tubular material, characterized in that the spring.

The method of claim 1,
Said coal piece (9) is a side core forming apparatus of a press mold for hot forming a tubular material, characterized in that the urethane block.