CN114570836B - Metal plate rivetless connection forming die and method - Google Patents

Abstract

The invention discloses a metal plate rivetless connection forming die, which comprises an upper male die, a blank holder, a female die, a lower male die and a cushion block, and the invention also provides a metal plate rivetless connection forming method which comprises the following steps: 1, placing two metal plates on a female die up and down, enabling a blank holder to move downwards to press the upper metal plate and the lower metal plate, enabling an upper male die to move downwards to enable the upper metal plate and the lower metal plate to generate plastic deformation, and embedding the upper metal plate into the lower metal plate; 2, the upper punch and the blank holder are static, and the lower punch moves upwards to extrude the metal plate until the upper surface of the lower punch is level with the upper surface of the cushion block, so that the upper metal plate and the lower metal plate are fully embedded; and 3, resetting the upper punch, the blank holder and the lower punch, and taking out the connected metal plates to complete a complete process. The invention effectively reduces the protrusion height of the rivetless connection joint of the metal plate, increases the interlocking value of the joint and improves the integral strength of the joint.

Description

Forming die and method for rivetless connection of metal sheets

technical field

The invention relates to the field of metal plate connection, in particular to a forming die and method for riveted metal plate connection.

technical background

With the increasing requirements for energy saving, material saving, and environmental protection in today's world, in the field of sheet metal connection, the traditional self-piercing riveting and resistance spot welding processes are not suitable for today's social development trends. The rivetless connection process uses the plastic deformation of the plate itself to realize mechanical interlocking, which has the advantages of wide application range, low cost, and simple operation. However, the current rivetless connection process has problems such as insufficient joint strength and high joint protrusions, which affect the product. The service life and surface quality are gradually difficult to meet the actual production needs.

Therefore, how to change the status quo of insufficient rivetless connection joint strength and high joint protrusion in the prior art has become an urgent problem to be solved by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a forming die for rivetless joints of metal sheets to solve the above-mentioned problems in the prior art and improve the overall performance of the rivetless joints.

In order to achieve the above object, the present invention provides the following scheme: the present invention provides a forming die for riveted connection of metal sheets, which mainly includes an upper punch, a blank holder, a die, a lower punch and a spacer, the upper punch It is connected with the inner cylinder above the press, the blank holder is connected with the outer cylinder above the press, the blank holder is set on the outside of the upper punch and the two are coaxially arranged and slidably connected, the die , the lower punch and the pad are arranged coaxially, the die and the pad are fixed on the press, and the lower punch is connected to the cylinder below the press.

Preferably, the upper punch and the blankholder, the die and the lower punch, and the lower punch and the pad all adopt clearance fit.

Preferably, the upper punch, the die and the lower punch are made of die steel, and the blank holder and the spacer are made of ordinary structural steel.

The present invention also provides a method for forming a metal sheet without rivet connection, using the above-mentioned metal sheet rivetless connection forming die, comprising the following steps:

Step 1: Place two metal sheets up and down on the die, the blank holder moves downward to compress the upper and lower metal sheets, and the upper punch moves downward to make the upper and lower metal sheets the sheet is plastically deformed, and the upper sheet metal is embedded in the lower sheet metal;

Step 2: The upper punch and the blank holder are stationary, and the lower punch moves upward to squeeze the metal sheet until the upper surface of the lower punch is equal to the upper surface of the pad, so that the The upper and lower metal plates are fully embedded in each other;

Step 3: The upper punch, blankholder and lower punch are reset, and the connected metal sheet is taken out to complete a complete process.

Preferably, the upper punch is reset first, then the blank holder is reset, and finally the lower punch is reset.

Compared with the prior art, the present invention achieves the following technical effects: the present invention provides a forming die for rivetless connection of metal sheets, which mainly includes an upper punch, a blank holder, a die, a lower punch and a spacer. The die is connected with the inner cylinder above the press, the blankholder is connected with the outer cylinder above the press, the blankholder is set on the outside of the upper punch, and the two are coaxially arranged and slidably connected. The die, the lower punch and the pad are coaxially arranged, the die and the pad are fixed on the press, and the lower punch is connected to the cylinder below the press. The present invention also provides a method for forming metal sheets without riveting: 1. Put two metal sheets up and down on the die, the blank holder moves downward to compress the upper and lower metal sheets, and the upper punch moves downward to make the upper 1. The lower metal plate undergoes plastic deformation, and the upper metal plate embeds the lower metal plate; 2. The upper punch and blank holder are stationary, and the lower punch moves upward to squeeze the metal plate until the upper surface of the lower punch is equal to the upper surface of the pad. Fully embed the upper and lower metal sheets; 3. Reset the upper punch, blank holder and lower punch, take out the connected metal sheets, and complete a complete process. The invention effectively reduces the protrusion height of the rivetless connection joint of metal plates, and significantly improves the strength of the rivetless connection joint of metal plates.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the existing technical solutions, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those of ordinary skill in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

Fig. 1 is the sectional structure schematic diagram when a kind of sheet metal rivetless connection forming die of the present invention works;

Fig. 2 is a schematic diagram of the cut-away structure of a metal plate rivetless connection forming die of the present invention in another working state;

Fig. 3 is the schematic diagram of the board when utilizing a kind of riveted connection forming method of metal sheets of the present invention;

Fig. 4 is a schematic diagram after step 1 is completed when utilizing a metal plate rivetless connection forming method of the present invention;

Fig. 5 is a schematic diagram after forming using a metal plate rivetless connection forming method of the present invention;

Among them, 1 is the upper punch, 2 is the blank holder, 3 is the die, 4 is the lower punch, 5 is the pad, t ₀ is the thickness of the upper plate, t ₁ is the thickness of the lower plate, H ₀ is the step The height of the metal plate rivetless joint joint after the end of step 1, X ₀ is the interlock value of the metal plate rivetless joint joint after the end of step 1, H ₁ is the height of the metal plate rivetless joint joint after the end of step 3, X ₁ is after the end of step 3 Interlock values for riveted joint joints of sheet metal.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The object of the present invention is to provide a forming die for the rivetless connection of metal sheets to solve the above-mentioned problems in the prior art.

Please refer to Figures 1-5, wherein, Figure 1 is a schematic diagram of a cutaway structure of a metal sheet rivetless connection forming die of the present invention; Figure 2 is another work of a metal sheet rivetless connection forming die of the present invention The schematic diagram of the sectional structure during the state; Fig. 3 is the schematic diagram of the slab when utilizing a kind of metal plate rivetless connection forming method of the present invention;

Fig. 4 is a schematic diagram after step 1 is completed using a method for forming a rivetless connection of metal sheets according to the present invention; Fig. 5 is a schematic diagram after forming using a method for forming a rivetless connection of metal sheets according to the present invention.

The present invention also provides a method for forming a rivetless connection of metal sheets, which includes the following steps:

Step 1: Place two metal sheets up and down on the die, the blank holder moves downward to compress the upper and lower metal sheets, and the upper punch moves downward to make the upper and lower metal sheets the sheet is plastically deformed, and the upper sheet metal is embedded in the lower sheet metal;

Step 2: The upper punch and the blank holder are stationary, and the lower punch moves upward to squeeze the metal sheet until the upper surface of the lower punch is equal to the upper surface of the pad, so that the The upper and lower metal plates are fully embedded in each other;

Step 3: The upper punch, blankholder and lower punch are reset, and the connected metal sheet is taken out to complete a complete process.

In step 1, the upper and lower metal plates with thicknesses t ₀ and t ₁ are placed on the die 3, and positioning pins are arranged on the die 3 to ensure that the placement position of the upper and lower metal plates is accurate, and the upper punch 1 It is connected with the inner cylinder of the press, and the blank holder 2 is connected with the outer cylinder of the press. The blank holder 2 moves downward to press the upper and lower metal sheets, and the upper punch 1 moves downward to make the upper and lower metal sheets Plastic deformation, the upper sheet metal embeds the lower sheet metal. The formed rivetless joint has a raised height H ₀ and an interlock value X ₀ .

In step 2, the blank holder and the upper punch remain stationary, and the lower punch moves upwards to the upper dead point driven by the lower cylinder of the press, at this time, the upper surface of the lower punch is level with the upper surface of the pad , the raised height of the formed rivetless joint joint is H ₁ , and the interlocking value is X ₁ . Among them, H ₁ <H ₀ , X ₁ >X _O , and the height of the rivetless connection joint of the metal sheet is effectively reduced, and the interlocking value of the joint is increased at the same time, and the quality of the rivetless connection joint of the metal sheet is improved.

In step 3, the upper inner cylinder of the press first drives the upper punch to reset, then the outer cylinder above the press drives the blank holder to reset, and finally the lower cylinder of the press drives the lower punch to reset, and after taking out the metal sheet, complete a complete process.

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (6)

1. A sheet metal rivetless connection forming die is characterized in that: the die comprises an upper male die, a blank holder, a female die, a lower male die and a cushion block, wherein the upper male die is connected with an inner cylinder body above a press, the blank holder is connected with an outer cylinder body above the press, the blank holder is sleeved on the outer part of the upper male die and is coaxially arranged and slidingly connected with the outer part of the upper male die, the female die, the lower male die and the cushion block are coaxially arranged, the lower male die is sleeved outside the cushion block, the female die is sleeved outside the lower male die, the cushion block and the female die are fixed on the press, and the lower male die is connected with the cylinder body below the press.

2. The rivetless connection forming die for metal sheets according to claim 1, wherein: the upper male die and the blank holder, the female die and the lower male die, and the lower male die and the cushion block are in clearance fit.

3. The rivetless connection forming die for metal sheets according to claim 1, wherein: the upper male die, the female die and the lower male die are made of die steel materials, and the blank holder and the cushion block are made of common structural steel materials.

4. A method for forming a rivetless connection of metal plates by using the rivetless connection forming die for metal plates according to any one of claims 1 to 3, comprising the steps of:

step one: placing two metal plates on the female die up and down, enabling the blank holder to move downwards to press the upper metal plate and the lower metal plate, enabling the upper male die to move downwards to enable the upper metal plate and the lower metal plate to generate plastic deformation, and enabling the upper metal plate to be embedded into the lower metal plate;

step two: the upper male die and the blank holder are static, and the lower male die moves upwards to extrude the metal plate until the upper surface of the lower male die is level with the upper surface of the cushion block, so that the upper metal plate and the lower metal plate are fully embedded into each other;

step three: and resetting the upper punch, the blank holder and the lower punch, and taking out the connected metal plates to complete a complete process.

5. The method for rivetless connection forming of sheet metal of claim 4, wherein: in the second step, when the stroke of the lower punch reaches the top dead center, the upper surface of the lower punch is leveled with the upper surface of the cushion block.

6. The method for rivetless connection forming of sheet metal of claim 4, wherein: and step three, resetting the upper male die, resetting the blank holder, and resetting the lower male die.

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