CN119035376A - U-shaped metal part blanking method - Google Patents

Abstract

The invention relates to the field of metal processing technology, and specifically to a U-shaped metal part punching method. First, the blade of a metal strip is punched three times, and the slitting allowances of the three punchings are 15% of the thickness of the metal strip, 8% of the thickness of the metal strip and 0 respectively, so that the proportion of the bright band of the blade is optimized. In addition, the proportion of the bright band of the blade when the slitting punch punches the metal strip is increased by changing the materials of the slitting punch and the slitting die, and the stability of the slitting punch during punching is increased by arranging a knife at the bottom of the slitting punch. The above methods are combined to increase the proportion of the bright band at the blade of the metal strip, thereby improving the performance of the product.

Description

U-shaped metal part blanking method

Technical Field

The invention relates to the technical field of metal processing, in particular to a blanking method of a U-shaped metal piece.

Background

The cutting edge of some high-precision parts on the market needs to be matched with other parts, the larger the contact area between the cutting edge and other parts is, the better the performance of the terminal product is, and the method for increasing the occupation ratio of the cutting edge bright band on the cutting surface is one method for increasing the contact area.

The existing U-shaped metal piece is generally directly subjected to primary blanking molding when a knife edge is molded, and a small part of the existing U-shaped metal piece is subjected to secondary blanking molding. The duty ratio of the knife edge bright band formed by the process is difficult to reach the customer requirement and is unstable.

Disclosure of Invention

The invention provides a blanking method of a U-shaped metal piece, which aims to solve the problems that the proportion of a cutting edge bright band of the U-shaped metal piece in the related art is difficult to reach the customer requirement and the cutting edge bright band is unstable.

S1, carrying out knife edge first blanking on a metal strip material which is intermittently fed, wherein the blanking position is the position where two sides of the metal strip material are opposite;

S2, performing knife edge secondary blanking on the metal strip;

S3, cutting the metal strip for the third time;

S4, cutting the metal strip subjected to three times of blanking by the knife edge, wherein the first cutting is to cut the area between two adjacent blanking positions on the metal strip to form a notch, and the metal strip is not completely cut at the moment;

s5, bending the metal strip to form a U shape, wherein the bending times are twice;

S6, sequentially cutting the continuous U-shaped metal strips into independent U-shaped metal pieces, cutting the continuous part between two diametrically opposite notches of the metal strips, and cutting the U-shaped metal strips into U-shaped metal pieces one by one;

The blanking equipment comprises an upper die set, an upper base plate, a fixing plate, a height limiting plate, a stripper plate and a cutting punch, wherein the upper die set is matched with the lower die set, the upper die set comprises an upper die base, an upper base plate, a fixing plate, a height limiting plate, the stripper plate and the cutting punch, the upper base plate is fixed on the lower surface of the upper die base, the fixing plate is fixed on the lower surface of the upper base plate, the cutting punch is fixed on the lower surface of the fixing plate through a fixing plate insert, the lower surface of the fixing plate is connected with the stripper plate through the height limiting plate, a stripper plate insert is fixed on the stripper plate, and the lower end of the cutting punch slides to penetrate through the height limiting plate and the stripper plate insert on the stripper plate.

In one possible implementation, the cutting allowance of the three-time knife edge cutting is different, the cutting allowance A of the first time cutting is 15% of the thickness of the metal strip, the cutting allowance B of the second time cutting is 8% of the thickness of the metal strip, and the cutting allowance of the third time cutting is 0, namely, the metal strip is cut to the required size by the third time cutting.

In one possible implementation mode, the bottom of the cutting male die is provided with a leaning knife, one end of the leaning knife is flush with the cutting male die, one end of the bottom of the cutting male die, which is far away from the leaning knife, is provided with an extrusion bevel, the extrusion bevel is 65 degrees after the cutting male die extends 0.3mm in the vertical direction of blanking, and the leaning knife strengthens the cutting male die and improves the stability of the cutting male die during blanking.

In one possible implementation manner, the lower die set comprises a lower die holder, a lower base plate, a concave die plate and a slitting concave die, wherein the lower base plate is fixedly arranged on the upper surface of the lower die holder, the concave die plate is fixedly arranged on the upper surface of the lower base plate, and the slitting concave die is fixed on the concave die plate and corresponds to the slitting convex die.

In one possible implementation, the slitting male die and the slitting female die are made of cold-work die steel and are made of SKH-51.

In one possible implementation mode, the surfaces of the slitting male die and the slitting female die are subjected to surface coating treatment, a physical weather deposition method is used for coating titanium carbide nitride, the thickness of one side of the coating is 0.002-0.003mm, the roughness after coating is less than or equal to Ra0.2, and pits, scratches, peeling, foaming and wrinkling cannot be caused on the coating.

The one or more technical schemes in the embodiment of the invention have at least one of the following technical effects that the cutting edge bright band duty ratio is increased by increasing the blanking times of the cutting edge of the metal strip under the same cutting allowance, the cutting edge bright band duty ratio is optimized by adjusting the cutting allowance each time under the three blanking times, the bright band duty ratio of the cutting edge when the cutting male die and the cutting female die blank metal strip are increased by changing the materials of the cutting male die and the cutting female die, the stability when the cutting male die blanks is increased by arranging the leaning knife at the bottom of the cutting male die, and the bright band duty ratio of the cutting edge of the metal strip is increased by combining the above modes, so that the performance of products is improved.

Drawings

Fig. 1 is a process flow diagram of the present invention.

Fig. 2 is a schematic view of the slitting margin when the blanking apparatus blanking the metal strip.

Fig. 3 is an enlarged schematic view of the region M in fig. 2.

Fig. 4 is a schematic diagram of the three blanking slit allowance ratio.

Fig. 5 is a schematic structural view of the blanking apparatus.

Fig. 6 is a schematic structural view of the optimized slitting punch.

The drawing shows that the die comprises a die holder 1, an upper die holder 2, an upper base plate 3, a fixing plate 31, a fixing plate insert, a height limiting plate 4, a stripper 5, a stripper 51, a stripper insert 6, a slitting male die 61, a cutter, a lower die holder 7, a lower base plate 8, a die holder 9, a die plate 10, a slitting female die 11 and a metal strip.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described below and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.

Referring to fig. 1, a method for blanking a U-shaped metal part includes the following steps:

S1, performing knife edge primary blanking on a metal strip 11, specifically selecting a proper metal plate, cutting the metal plate into the metal strip 11, then placing the metal strip 11 on a female die plate 9, intermittently moving the metal strip 11 to a primary blanking position from a clearance gap below a stripper plate 5, and performing primary blanking on two side edges of the metal strip 11 by using a slitting male die 6 when the metal strip 11 stops moving;

s2, performing knife edge secondary blanking on the metal strip 11, specifically, continuously moving in the direction of the next blanking after the metal strip 11 is subjected to primary blanking, and performing secondary blanking on the primary blanking positions of the two side edges of the metal strip 11 by the slitting male die 6 when the metal strip 11 stops moving again;

S3, cutting the metal strip 11 for the third time in the same way, wherein the cutting allowance of three cutting punches 6 used for cutting the metal strip 11 for the third time is different, the cutting allowance A of the first time is 15% of the thickness of the metal strip 11, the cutting allowance B of the second time is 8% of the thickness of the metal strip 11, the metal strip 11 is cut to the required size by the third time, and after the third time of cutting, the bright band at the cutting edge of the metal strip 11 is increased compared with that of the second time of cutting;

S4, cutting the notch of the metal strip 11 subjected to three times of cutting, specifically, cutting the area between two adjacent cutting positions when the metal strip 11 continues to move to stop next time, so that a notch is formed between the two adjacent cutting positions of the metal strip 11, and the metal strip 11 is convenient to bend subsequently;

S5, bending the metal strip 11 to form a U shape, specifically, bending the blanking position of the metal strip 11 when the metal strip 11 continues to move to stop next time, wherein the bending is performed twice, and the bending is ensured to be in the U shape and not reset;

S6, sequentially cutting the continuous U-shaped metal strip 11 into independent U-shaped metal pieces, specifically, cutting the continuous part between two notches, which are opposite to each other, of the U-shaped metal strip 11 when the bent U-shaped metal strip 11 continues to move to stop next time, so that the independent U-shaped metal pieces are formed.

The steps S1-S3 are completed by adopting a blanking device, as shown in fig. 2 and 5, the blanking device comprises an upper die set and a lower die set, the upper die set comprises an upper die holder 1, an upper base plate 2, a fixing plate 3, a height limiting plate 4, a stripper 5 and a cutting punch 6, the upper base plate 2 is fixed on the lower surface of the upper die holder 1, the fixing plate 3 is fixed on the lower surface of the upper base plate 2, the cutting punch 6 is fixed on the lower surface of the fixing plate 3 through a fixing plate insert 31, the lower surface of the fixing plate 3 is connected with the stripper 5 through the height limiting plate 4, a stripper insert 51 is fixed on the stripper 5, and the lower end of the cutting punch 6 slides through the height limiting plate 4 and the stripper insert 51 on the stripper 5.

As shown in fig. 5, the lower die set includes a lower die holder 7, a lower base plate 8, a die plate 9 and a slitting die 10, the lower base plate 8 is fixedly mounted on the upper surface of the lower die holder 7, the die plate 9 is fixedly arranged on the upper surface of the lower base plate 8, the slitting die 10 is fixed on the die plate 9 and corresponds to the slitting punch 6, when the upper die set and the lower die set are closed, the slitting punch 6 is inserted into the slitting die 10, and the height limiting plate 4 can ensure that the upper die set and the lower die set are not excessively extruded when being closed.

It should be noted that, under the definite times of three times of blanking, the cutting allowance of each blanking is determined by adopting a controlled variable method, as shown in fig. 3 and fig. 4, the overlapping portion of the metal strip 11 and the cutting punch 6 in fig. 3 is the cutting allowance, the cutting allowance of three times of knife edge blanking is different, the cutting allowance a of the first time of blanking is 15% of the thickness of the metal strip 11, the cutting allowance B of the second time of blanking is 8% of the thickness of the metal strip 11, and the cutting allowance of the third time of blanking is 0, namely, the metal strip 11 is cut to the required size by the third time of blanking.

In addition, in order to increase the stability of the slitting male die 6 during the cutting edge blanking of the metal strip 11, a leaning knife 61 is arranged at the bottom of the slitting male die 6, one end of the leaning knife 61 is flush with the slitting male die 6, and an extrusion bevel angle is arranged at one end of the bottom of the slitting male die 6, which is far away from the leaning knife 61, and the extrusion bevel angle is 65 degrees after the slitting male die 6 is in a blanking vertical direction and extends for 0.3 mm.

In order to enhance the strength of the slitting male die 6 and the slitting female die 10, cold work die steel made of SKH-51 is adopted to manufacture the slitting male die 6 and the slitting female die 10, and the outer surfaces of the slitting male die 6 and the slitting female die 10 are subjected to coating treatment, wherein the surface coating treatment method and parameters are as follows, a Physical Vapor Deposition (PVD) method is adopted to coat titanium carbide nitride (Ti CN) -gray black, the thickness of one side of the coating is 0.002-0.003mm, the roughness after the coating is less than or equal to Ra0.2, and the coating cannot have defects such as pits, scratches, peeling, foaming, wrinkling and the like.

In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, slidably connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The embodiments of the present invention are all preferred embodiments of the present invention, and are not limited in scope by the present invention, so that all equivalent changes according to the structure, shape and principle of the present invention are covered by the scope of the present invention.

Claims (6)

1. A blanking method of a U-shaped metal piece is characterized by comprising the following steps:

S1, performing knife edge first blanking on a metal strip (11);

s2, performing knife edge secondary blanking on the metal strip (11);

s3, performing knife edge third blanking on the metal strip (11);

S4, carrying out notch cutting on the metal strip (11) subjected to three times of cutting by the knife edge;

s5, bending the metal strip (11) to form a U shape;

S6, sequentially cutting the continuous U-shaped metal strip (11) into independent U-shaped metal pieces;

Wherein step S1-S3 adopts a blanking equipment cooperation to accomplish, blanking equipment includes upper die set and lower die set, the upper die set includes upper die base (1), upper padding plate (2), fixed plate (3), limit for height board (4), stripper (5) and cuts terrace die (6), the lower fixed surface of upper die base (1) has upper padding plate (2), and the lower fixed surface of upper padding plate (2) has fixed plate (3), and fixed plate (3) lower surface is fixed with through fixed plate mold insert (31) and cuts terrace die (6), and fixed plate (3) lower surface is connected with stripper (5) through limit for height board (4), is fixed with stripper mold insert (51) on stripper (5), and cuts stripper mold insert (51) on height limit plate (4) and stripper (5) are run through in the lower extreme slip of terrace die (6).

2. The method of blanking a U-shaped metal part according to claim 1, wherein the cutting allowance of three times of cutting edges is different, the cutting allowance A of the first time of cutting is 15% of the thickness of the metal strip (11), the cutting allowance B of the second time of cutting is 8% of the thickness of the metal strip (11), and the cutting allowance of the third time of cutting is 0.

3. The method for blanking the U-shaped metal part according to claim 1, wherein a leaning knife (61) is arranged at the bottom of the slitting male die (6), one end of the leaning knife (61) is flush with the slitting male die (6), an extrusion bevel angle is arranged at one end, far away from the leaning knife (61), of the bottom of the slitting male die (6), and the extrusion bevel angle is 65 degrees after the extrusion bevel angle extends 0.3mm in the blanking vertical direction of the slitting male die (6).

4. The method for blanking the U-shaped metal part according to claim 1, wherein the lower die set comprises a lower die holder (7), a lower base plate (8), a die plate (9) and a slitting die (10), the lower base plate (8) is fixedly arranged on the upper surface of the lower die holder (7), the die plate (9) is fixedly arranged on the upper surface of the lower base plate (8), and the slitting die (10) is fixed on the die plate (9) and corresponds to the slitting die (6).

5. A U-shaped metal piece blanking method as set forth in claim 4, wherein the slitting male die (6) and the slitting female die (10) are made of cold work die steel and are made of SKH-51.

6. The method for blanking the U-shaped metal part according to claim 4, wherein the surfaces of the slitting male die (6) and the slitting female die (10) are subjected to surface coating treatment, a physical weather deposition method is used for coating the titanium carbide nitride coating, the thickness of a single surface of the coating is 0.002-0.003mm, the roughness after coating is less than or equal to Ra0.2, and the coating cannot be provided with pits, scratches, peeling, foaming and wrinkling.