CN105436312A - Cold stamping die and molding method for grid flow guide plate - Google Patents

Abstract

The invention discloses a cold stamping die and a forming method of a grid deflector. The cold stamping die includes a die and a punch; guide posts for the punch to move up and down are respectively provided near two ends of the die, a pressing plate is provided on the upper side of the die, and a punch is provided on the upper side of the pressing plate, An elastic body is provided between the pressing plate and the punch, and both the pressing plate and the punch are sleeved on the guide column; a punch is provided on the lower side of the punch, and a cavity for forming is provided on the upper surface of the punch and the die Relatively set; the upper side of the punch is fixed with a handle. The forming method includes four steps of blanking, processing prefabricated holes, stamping a single row of prefabricated oblong holes, and sequentially punching the remaining prefabricated oblong holes. The forming mold of this invention is simple in structure, low in manufacturing cost, short in cycle time, and easy to use. It can ensure that the long round holes of the grid deflector are flanged along the normal line of the arc surface, and can effectively avoid the flipping of the entire grid deflector when the overall flanging is formed. Defects such as cracking are easy to occur at the edge.

Description

Cold stamping die and forming method of grid deflector

technical field

The invention belongs to the technical field of sheet metal parts processing, and in particular relates to a cold stamping die and a forming method for grid deflectors suitable for forming various large-size deflector-type sheet metal parts.

Background technique

Grid deflector parts are widely used in aerospace and rail transit and other fields. When the air flow passes through this kind of parts, not only must a certain amount of air flow be guaranteed, but also the noise control is very strict. Therefore, the precision of the flow guide position and the profile is required to be high.

At present, the more conventional processing methods are mostly integral forming, which requires a lot of functional modules of the mold, and the structure is also very complicated. The manufacturing cycle and cost of this type of mold are relatively high. There is a large error between the angular position and the center position of the arc profile, and the precision of the part is poor.

Contents of the invention

The purpose of the present invention is to propose a cold stamping die and forming method for grid deflectors, which overcomes the deficiencies of the prior art, and has a simple structure, low manufacturing cost, short cycle, easy use, and can ensure The requirement that the flanging of the oblong hole is along the normal line of the arc surface can effectively avoid defects such as easy cracking at the flanging when the overall flanging of the grid rectifier plate is formed.

In order to achieve the above-mentioned design purpose, the technical scheme adopted in the present invention is as follows:

A cold stamping die for a grid deflector, comprising a die and a punch; guide columns for the punch to move up and down are respectively provided near both ends of the die, and a pressing plate is provided on the upper side of the die, and the pressing plate There is a punch on the upper side, an elastic body is arranged between the pressure plate and the punch, and the pressure plate and the punch are both sleeved on the guide column; the punch is arranged on the lower side of the punch, and the punch is connected to the upper surface of the die. There are mold cavities for forming oppositely arranged; the upper side of the punch is fixed with a mold handle.

Preferably, the upper surface of the die is provided with an outer arc surface, the radius of which is equal to the radius of the inner arc surface of the grid deflector; The radii of the arcs are equal.

Preferably, the upper surface of the die is provided with three positioning blocks for placing and positioning the grid deflector; the positioning block is provided with a push rod, the push rod is covered with a spring, and the end of the push rod is provided with a small nut , the positioning block is set in the slideway through a push rod, a small nut and a spring.

Preferably, the die is provided with two guide pins, and the pressing plate is sleeved on the guide pins.

Preferably, the pressure plate and the elastic body are provided with avoidance grooves for avoiding punches of the punch; the die is designed with guide post avoidance grooves and ejector pin avoidance grooves.

Preferably, the two guide columns are connected to the pressure plate through the shaft shoulder surface, the thread on the end surface and the large nut.

Preferably, the punch position of the punch is chamfered at 30°-45°.

The present invention also provides a method for forming a grid deflector, the specific steps of which are as follows: the first step, blanking: calculate the expanded size of the grid deflector, and punch out a single blank by laser cutting or numerical control;

The second step, processing prefabricated holes: calculation of flanging process, calculation of the arrangement size of prefabricated long round holes, the spacing of each row of prefabricated long round holes is equal to the distance after flanging, and the distance between each row is the neutral angle after flanging is formed The arc length of the layer; the prefabricated oblong hole is punched by CNC punching;

The third step, single-row stamping: use the prefabricated long hole and the positioning block on the die for positioning, the punch goes down, the pressure generated by the compressed elastic body is transmitted to the pressure plate, and the blank is pressed, and the punch of the punch stamps the blank Form oblong holes to complete the stamping of the first row;

Step 4: Sequential stamping on the circumference: along the circumferential direction, punch the remaining rows of prefabricated oblong holes sequentially to obtain the grid deflector.

Preferably, the periphery of the oblong hole is blunt.

The advantages and positive effects of the present invention are: its structure is simple, the manufacturing cost is low, the cycle is short, and it is easy to use, it can ensure the requirement that the long round holes of the grid deflector be turned along the normal line of the arc surface, and effectively avoid the grid rectifier overall When the flanging is formed, defects such as cracking are easy to occur at the flanging.

The parts formed by this method are stable in quality, good in integrity, high in dimensional accuracy, and high in processing pass rate, which ensures the dimensional accuracy of the parts; reduces the complexity of the mold, and the conventional convex and concave mold structures can realize the forming of the parts. The processing cost is saved; while meeting the accuracy requirements of the circular arc profile of the deflector, it can also ensure that the flanging positions of the oblong holes are distributed along the normal direction of the arc profile.

1) The mold structure is simplified, and the grid deflector can be formed by using conventional convex and concave molds, which shortens the mold processing cycle and reduces the mold processing cost;

2) To avoid defects such as incomplete attachment of parts and molds and easy cracking at the flange when the parts are formed as a whole, and improve the processing accuracy of the parts;

3) Using single-row stamping first, and then sequential stamping, the flanging position of the long round hole can be distributed along the normal direction of the arc surface.

Description of drawings

Fig. 1 is the schematic diagram of grid deflector of the present invention;

Fig. 2 is the development of the grid deflector according to the present invention and the blank diagram of the prefabricated holes;

Fig. 3 is a structural diagram of the stamping die of the grid deflector according to the present invention;

Fig. 4 is a schematic diagram of die stamping and bonding according to the present invention;

Fig. 5 is a perspective view of a die for stamping and forming a grid deflector according to the present invention.

In the picture:

1. Die; 2. Press plate; 3. Guide column; 4. Punch; 5. Elastic body; 6. Positioning block; 7. Ejector; 8. Spring; 9. Guide pin; 10. Cavity; 11. Avoidance groove; 12, mold handle; 13, shaft shoulder surface; 14, slideway; 15, inner hexagon screw; 16, large nut; 17, small nut; 18, guide column avoidance groove; 19, ejector rod avoidance groove; 20 , grid deflector; 30, blank, 31, oblong hole.

detailed description

Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 , the shape of the grid deflector 20 to be formed in the present invention.

As shown in FIG. 2 , the shape of the blank 30 and the prefabricated oblong holes 31 used in the grid deflector forming die, the blank 30 is punched with the prefabricated oblong holes 31 .

As shown in Figures 3-5, a cold stamping die for grid deflectors includes a fixed die 1 and a movable punch 4; The guide column 3 that moves up and down, the upper side of the die 1 is provided with a pressing plate 2 for pressing the grid deflector and unloading, the upper side of the pressing plate 2 is provided with a punch 4, and the pressing plate 2 and the punch 4 are provided. There is an elastic body 5, the pressure plate 2 and the punch 4 are both sleeved on the guide column 3; the lower side of the punch 4 is provided with a punch, and the punch and the upper surface of the die 1 are provided with a mold cavity 10 for forming. .

The upper surface of the die 1 is provided with an outer arc surface whose radius is equal to the radius of the inner arc surface of the grid deflector; the lower surface of the pressing plate 2 is provided with an inner arc surface whose radius is equal to the outer circle of the grid deflector. The radius of the arc surface is equal; the outer arc surface of the die, the inner arc surface of the pressure plate, and the elastic body structure are arranged between the punch and the pressure plate, so that the pressure generated by the compression of the elastic body is transmitted to the pressure plate, and the arc of the grid rectifier plate can be realized. The forming of the surface, and it plays the role of pressing the rectifying plate when flanging the oblong hole.

The upper surface of the die 1 is provided with three positioning blocks 6 for placing and positioning the grid deflector; the three positioning blocks 6 are installed in the slideway 14 through the push rod 7 and the small nut 17, And return to initial position by spring 8.

The die 1 is provided with two guide pins 9; the two guide pins 9 are fixed with the die 1 by interference fit and distributed along the angle.

The positioning block 6 is provided with a ejector rod 7, and the ejector rod 7 is covered with a spring 8; this structure can ensure the precise positioning of the blank during forming, and the grid deflector is ejected out of the cavity of the die after forming.

The pressure plate 2 and the elastic body 5 are provided with an avoidance groove 11 for avoiding the punch of the punch 4; the punch of the punch 4 is guaranteed to enter the cavity of the die 1 smoothly, and the pressure plate 2 takes into account the unloading function after forming.

The position of the punch 4 of the punch is chamfered at 30°-45°; it is ensured that the punch can easily enter the prefabricated hole of the grid deflector, and that the position of the mouth after flanging is smooth.

The concave mold 1 is designed with a guide post avoidance groove 18 and a push rod avoidance groove 19, during the forming process of the grid deflector, the guide post 3, the large nut 16, the ejector rod 7, and the small nut 17 are avoided.

The two guide columns 3 are connected with the pressure plate 2 through the shoulder surface 13 , the thread on the end surface and the large nut 16 .

The upper side of the punch 4 is fixed with a die handle 12 by five hexagon socket head cap screws 15 .

The working process is as follows: place the blank 30 on the die 1, position three of the prefabricated oblong holes 31 in the first row of the blank 30 with the three positioning blocks 6, and the punch 4 goes down along the guide column 3. When the pressure plate 2 contacts When the blank 30 is on the surface, the elastic body 5 starts to be compressed, the pressure generated by the elastic body 5 is transmitted to the pressure plate 2, and the part 7 is pressed, the punch 4 continues to go down and enters the cavity 10 of the die 1, and the positioning block 6 moves along the slideway 14 Move down, the punch 4 is unloaded and goes up, the positioning block 6 is restored to the initial position by the spring 8 on the ejector rod 7, and the parts are ejected, and the first row of prefabricated oblong holes 31 on the blank 30 is flanged and stamped, and the blank 30 is taken out. Complete the second row of prefabricated oblong holes 31 flanging stamping, shown in Figure 5 is the schematic diagram of completing two rows of prefabricated oblong holes 31 flanging stamping, complete the third row, fourth row and fifth row of prefabricated oblong holes 31 stamping successively, realize Forming of grid deflectors.

The cold stamping forming method of the grid deflector, its specific steps are:

The first step, blanking: calculate the expanded size of the grid deflector: length = (Π × neutral layer diameter × grid rectifier arc angle) ÷ 360, the height is the height of the grid rectifier, using laser cutting Or punch a single piece of blank by CNC;

The second step, processing the prefabricated hole: calculation of the flanging process; the width of the prefabricated oblong hole = the width of the neutral layer after the flanging - 2 × (the height after the flanging - 0.43 × the radius of the inner fillet after the flanging - 0.72 × the thickness of the blank), The length of the prefabricated oblong hole = the length of the neutral layer after flanging - the width of the prefabricated oblong hole; the arrangement size of the prefabricated oblong holes, the spacing of the prefabricated oblong holes in each row is equal to the distance after flanging, and the distance between each row is the flanging forming The arc length of the neutral layer at the rear angle; the prefabricated oblong hole 31 is punched and punched by numerical control;

The third step, single-row punching: use the prefabricated oblong hole 31 and the positioning block on the die 1 to position in 6 rows, the punch 4 goes down, and the pressure generated by the compressed elastic body 5 is transmitted to the pressure plate 2, and the blank is pressed to complete the first step. a row of stamping;

Step 4: Sequential punching around the circumference: Punching the remaining rows of prefabricated oblong holes 31 sequentially along the circumferential direction to obtain a grid deflector.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, so that those skilled in the art can understand and apply the present invention, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention without creative work. Therefore, simple improvements made to the present invention by those skilled in the art based on the disclosure of the present invention should all be within the protection scope of the present invention.

Claims (9)

1. A cold stamping die for a grid deflector, characterized in that: comprise a die and a punch; the die is respectively provided with a guide column for moving up and down of the punch near two ends of the die, and on the die, There is a pressing plate on the side, and a punch is arranged on the upper side of the pressing plate. An elastic body is arranged between the pressing plate and the punch. Both the pressing plate and the punch are sleeved on the guide column; The head and the upper surface of the concave mold are provided with a mold cavity for forming and are arranged oppositely; the upper side of the male mold is fixed with a mold handle. 2. The cold stamping die of the grid deflector according to claim 1, characterized in that: the upper surface of the die is provided with an outer arc surface, the radius of which is equal to the radius of the inner arc surface of the grid deflector; The lower surface of the pressure plate is provided with an inner arc surface, the radius of which is equal to the radius of the outer arc surface of the grid deflector. 3. The cold stamping die of the grid deflector according to claim 2, characterized in that: the upper surface of the die is provided with three positioning blocks for placing and positioning the grid deflector; the positioning block A ejector rod is arranged on the top, a spring is sheathed on the ejector rod, a small nut is provided at the end of the ejector rod, and the positioning block is arranged in the slideway through the ejector rod, the small nut and the spring. 4 . The cold stamping die for grid deflectors according to claim 3 , wherein two guide pins are arranged on the die, and the pressing plate is sleeved on the guide pins. 5. The cold stamping die of the grid deflector according to claim 3, characterized in that: the pressure plate and the elastic body are provided with avoidance grooves for avoiding punches of the punch; the die is designed with a guide Column avoidance groove and ejector rod avoidance groove. 6 . The cold stamping die of the grid deflector according to claim 5 , wherein the two guide columns are connected to the pressure plate through shoulder surfaces, end surface threads and large nuts. 7 . 7 . The cold stamping die for the grid deflector according to claim 5 , wherein the punch position of the punch is chamfered at 30°-45°. 8. A method for forming the grid deflector according to any one of the above claims, characterized in that: the specific steps are: The first step, blanking: calculate the expanded size of the grid deflector, and use laser cutting or numerical control to punch down a single blank; The second step, processing prefabricated holes: calculation of flanging process, calculation of the arrangement size of prefabricated long round holes, the spacing of each row of prefabricated long round holes is equal to the distance after flanging, and the distance between each row is the neutral angle after flanging is formed The arc length of the layer; the prefabricated oblong hole is punched by CNC punching; The third step, single-row stamping: use the prefabricated long hole and the positioning block on the die for positioning, the punch goes down, the pressure generated by the compressed elastic body is transmitted to the pressure plate, and the blank is pressed, and the punch of the punch stamps the blank Form oblong holes to complete the stamping of the first row; Step 4: Sequential stamping on the circumference: along the circumferential direction, punch the remaining rows of prefabricated oblong holes sequentially to obtain the grid deflector. 9. The forming method of the grid deflector according to claim 8, characterized in that: the periphery of the oblong hole is blunt.