KR200352251Y1 - Joining device for surface treated steel sheet - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a surface-treated steel sheet (Pre-Coated Steel Sheet), and more particularly to a bonding apparatus that can improve the bonding strength of the surface-treated steel sheet to the bonded plate without using a separate fastening component or welding method.

I. The technical problem that the invention is trying to solve.

It is an object of the present invention to provide a joining apparatus for a surface-treated steel sheet for bonding the surface-treated steel sheet to another steel sheet without using a separate fastener or welding.

All. The gist of the solution of the invention.

The present invention provides a punch holder, a circular rod part, a punch, a die provided on a stationary side template, and a die slot formed at a position opposite to the punch on the die, and protruding from a bottom surface of the die slot. Comprising a press mold configured to include, the press mold is installed in the press to overlap the surface-treated steel sheet and the bonded plate between the punch holder and the die and the punch holder is lowered to bond the surface-treated steel sheet to the bonded plate In the bonding apparatus of the surface-treated steel sheet, between the lower end of the rod portion of the punch and the punch protrusion, a round rod and a punch round made of curved surfaces are formed, respectively, the die slot inlet of the die, the bottom surface of the die, and the die protrusion. Between each form an inlet round and protrusion round consisting of curved surfaces, Value is characterized by forming a tapered portion that gradually increases in diameter from the loading portion toward the center of the punch holder, and the inner surface there is formed an inclined surface that is gradually narrowed down to the bottom of the die from the entrance slot of the die slot.

la. Important uses of the devise.

The present invention is used for bonding surface treated steel sheets.

Description

Joining Equipment for Surface Treated Steel Sheet

The present invention relates to a bonding apparatus for a pre-coated steel sheet, and more particularly, to a bonding apparatus for improving bonding strength of a surface-treated steel sheet to a bonded plate without using a separate fastening component or welding method. .

In recent years, surface-treated steel sheets used in industrial products in the fields of communication and home appliances have been able to realize various colors and patterns by coating non-conductive coatings in advance when manufacturing steel sheets, and have previously manufactured products from steel sheets. Since the painting can solve the environmental pollution and human harmful problems caused by the use is increasing trend.

On the other hand, while the surface-treated steel sheet has a number of advantages as described above, there is a big problem in the bonding with other components. In the case of steel sheets, a welding method is generally used to join different steel sheets. Since the non-conductive coating coated on the surface-treated steel sheet has extremely low heat resistance against heat deformation compared to the welding temperature, other steel sheets without damage to the surface-treated steel sheet are used. Cannot be joined to components. Therefore, in order to bond the surface-treated steel sheet with another steel sheet, a rivet or a screw, which is a separate fastening component, has been used.

1 is a cross-sectional view showing a state in which two steel plates are bonded by rivets according to an embodiment of the prior art, Figure 2 is a cross-sectional view showing a state in which two steel plates are bonded by a screw according to the embodiment of the prior art.

As shown in FIG. 1, in order to bond the surface-treated steel sheet 10 formed of the bonding plate 12 and the coating layer 14 formed on one side of the bonding plate 12 with the bonded plate 20 using the rivet 30, first, the surface-treated steel sheet 10 and Drill a hole at a fixed position on the plate 20 to be joined using a drill or the like. Subsequently, after inserting the rivet body 34 portion of the rivet 30 into the hole, the surface-treated steel sheet 10 and the joined plate 20 are joined to each other by pressing the end portions of the rivet body 34 protruding to the opposite side.

In addition, in order to bond the surface-treated steel plate 10 which consists of the bonding plate 12 and the coating layer 14 formed in the said bonding plate 12 with the to-be-bonded board 20 using the screw 40, as shown in FIG. A screw hole is formed at a constant position of 20. Subsequently, after inserting the 44 parts of the screw body 44 of the screw 40 into the screw hole, the surface-treated steel sheet 10 is welded by rotating the screw 40 until the bottom of the screw head 42 is in close contact with the upper surface of the surface-treated steel sheet 10 using a screwdriver. Bonded to plywood 20.

However, when the surface-treated steel sheet 10 is bonded by using the rivet 30 or the screw 40 as shown in FIGS. 1 and 2, the rivet head 32 or the screw head 42 is exposed to the outside. If a large number of fasteners such as rivets or screws are projected on the exterior of the product using the surface-treated steel sheet, the competitiveness of the product may be deteriorated in consideration of the consumer's standards of appearance as important as the product's function. In addition, there were problems such as an increase in manufacturing costs due to the consumption of fasteners and an increase in the number of processes due to the fastening of fasteners.

In order to solve the above problems, an object of the present invention is to provide a bonding apparatus of the surface-treated steel sheet to improve the bonding strength of the surface-treated steel sheet without using a separate fastener or welding.

In order to achieve the above object, the present invention provides a punch holder installed on a movable side template, a rod portion protruding from the lower surface of the punch holder and having a circular cross section, and a diameter smaller than the diameter of the rod portion protruding from the lower surface of the rod portion. A punch formed of a punch protrusion having a die, a die provided on a fixed side template, and a die slot formed at a position facing the punch, the die protrusion protruding from a bottom surface of the die slot. In the joining apparatus of the surface-treated steel sheet which is provided, the press mold is installed in the press machine, the surface-treated steel sheet and the bonded plate are overlapped between the punch holder and the die, and the punch holder is lowered to bond the surface-treated steel sheet to the bonded plate. In

A rod round and a punch round each having a curved surface are formed between the punch protrusions from the lower end of the rod portion of the punch,

A die inlet round and a protrusion round formed between the die slot inlet of the die and the bottom and die protrusion of the die, respectively;

The punch is provided with a tapered portion whose diameter increases from the central portion of the rod portion toward the punch holder,

The inner side surface of the die slot is characterized in that the inclined surface is formed narrower toward the bottom from the inlet of the die slot.

1 is a cross-sectional view showing a state in which two steel plates are joined by rivets according to an embodiment of the prior art,

Figure 2 is a cross-sectional view showing a state in which two steel plates are joined by a screw according to the embodiment of the prior art,

3 is a cross-sectional view showing a punch holder having a punch according to a preferred embodiment of the present invention,

4 is a cross-sectional view showing a die having a die slot according to a preferred embodiment of the present invention;

5 is a cross-sectional view showing the bonding of the surface-treated steel sheet and the bonded plate by a bonding device having a punch and a die according to an embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: surface treated steel sheet 12: laminated plate

14 coating layer 50 punch holder

60: punch 65: punch protrusion

80: die 87: die protrusion

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a cross-sectional view showing a punch holder with a punch according to a preferred embodiment of the present invention, Figure 4 is a cross-sectional view showing a die having a die slot according to a preferred embodiment of the present invention.

An apparatus for bonding a surface-treated steel sheet according to an embodiment of the present invention includes a punch holder having a punch shown in FIG. 3 and a die including a die having a die slot shown in FIG. 4. A die 70 is fixed to the stationary side template of the press die, and a punch holder 50 is provided on the movable side template located above the stationary side template.

A punch 60 is formed below the punch holder 50. The punch 60 has a rod portion 62 protruding from the lower surface of the punch holder 50 and having a circular cross section, and a diameter smaller than the diameter of the rod portion, protruding from the lower surface of the rod portion. It consists of a punch projection 65. The punch 60 is formed with a tapered portion 61, the diameter of which increases from the central portion of the rod portion 62 toward the punch holder 50, and between the lower end of the rod portion 62 and the punch protrusion 65, a rod round 63 and a punch round 64 formed of curved surfaces. Form each.

The die 70 forms a die slot 80 at a position opposite to the punch 60, and a die protrusion 87 protrudes from a bottom surface of the die slot 80. In addition, the inner side of the die slot 80 forms an inclined surface 83 that narrows from the inlet of the die slot 80 toward the bottom, and the curved inlet round 81, the bottom round 84, and the protrusion round 86 are respectively the inlet, the inside of the die slot 80. Between side 83 and bottom 85 and between bottom 85 and die protrusion 87.

5 is a cross-sectional view showing a state of bonding the surface-treated steel sheet and the joined steel sheet by a bonding apparatus having a punch and a die according to an embodiment of the present invention.

The features of the present invention can be found in the principle of cold pressure bonding method. In the cold pressure bonding method, when two different metal surfaces to be bonded are brought close to each other up to a point corresponding to an average distance of 1.5 times the atomic distance, the attraction and repulsion between the two metal atoms are balanced. As diffusion occurs, the boundary between the two metal surfaces disappears and is bonded to each other. Such a cold pressure welding method does not involve high heat generation except for a slight frictional force when joining two metals, thereby preventing damage to the metal due to heat embrittlement, and high strength bonding is possible without deformation of the metal to be joined.

Referring to Figures 3 to 5 to explain the process of bonding the surface-treated steel sheet to the bonded plate by the bonding apparatus of the surface-treated steel sheet according to an embodiment of the present invention as follows.

The punch holder 50 shown in Fig. 3 and the die 70 shown in Fig. 4 are mounted on the movable side template and the stationary side template of the press die, respectively, and the press die is mounted on the press machine (moving side template and fixed side described above). The template and the press are not shown). Then, the surface-treated steel sheet 10 and the bonded plate 20 are stacked side by side, and then placed on the upper surface of the die 70, and the position to be bonded is adjusted to be positioned on the die slot 80 of the die 70.

Subsequently, when the movable side template is lowered, the punch holder 50 provided on the movable side template is lowered, and the punch 60 formed on the bottom surface of the punch holder 50 compresses the upper surface of the surface-treated steel sheet 10 on the die 70. . That is, as shown in Figure 5, the punch 60 is inserted into the die slot 80 of the die 70 while pressing the upper surface of the surface-treated steel sheet 10, wherein the surface-treated steel sheet 10 and the bonded plate 20 is punched by the pressure of the punch 60, respectively It is in close contact with the outer side of 60 and the inner side of the die slot.

On the other hand, when the punch holder of the movable side template is lowered to the lower limit, the punch protrusion of the punch is further pressed downward on the upper surface of the surface-treated steel sheet by the height of the protrusion of the punch protrusion, and is formed at a position facing the punch protrusion. The die protrusion of one die slot further compresses the lower surface of the plate to be joined upward by the protrusion height of the die protrusion.

As the punch protrusions and the die protrusions press the surface-treated steel sheet and the bonded plate to face each other, the diffusion occurs due to the magnetic vibration of the atoms constituting the two plates according to the above-described cold pressure bonding principle. The boundary between the surfaces is lost and joined together. When the plastic deformation of the two plates occurs, a small amount of frictional heat is generated, which acts as a catalyst to promote the diffusion of atoms without damaging the appearance of the surface-treated steel sheet.

The curved portions formed on the punch, that is, rod round 63 and punch round 64, prevent the cutting or damage of the surface of the coated steel sheet 10 which is in direct contact with the punch when the punch 60 presses the coated steel sheet 10, and the die The curved portions formed in the slots, namely the inlet round 81, the bottom round 84 and the protrusion round 86, also prevent the surface of the plate 20 to be damaged.

As described above, the bonding apparatus for the surface-treated steel sheet according to the embodiment of the present invention can improve the bonding strength of the surface-treated steel sheet with high strength without using a separate fastener or welding, thereby reducing the cost and shortening the manufacturing process. As well as to achieve this, when manufacturing the product using a surface-treated steel sheet there is no effect of protruding to the outside has the effect of improving the appearance quality of the product.

Claims (1)

A punch consisting of a punch holder provided on the movable side template, a rod portion projecting from the lower surface of the punch holder and having a circular cross section, a punch protrusion projecting from the lower surface of the rod portion and having a diameter smaller than the diameter of the rod portion, A die installed in the template; The die is formed of a press die formed at a position opposite to the punch, and including a die protrusion protruding from the bottom surface of the die slot, and the press die is installed in a press to install the punch holder and the die. In the bonding apparatus of the surface-treated steel plate which overlaps a surface-treated steel plate and a to-be-joined plate, and lowers the said punch holder, and joins the said surface-treated steel plate to a to-be-joined plate, A rod round and a punch round each having a curved surface are formed between the punch protrusions from the lower end of the rod portion of the punch, A die inlet round and a protrusion round formed between the die slot inlet of the die and the bottom and die protrusion of the die, respectively; The punch is provided with a tapered portion whose diameter increases from the central portion of the rod portion toward the punch holder, Bonding device of the surface-treated steel sheet, characterized in that formed on the inner surface of the die slot inclined surface narrowing toward the bottom from the inlet of the die slot.