CN102962360B - Stamping drawing forming die for inner-hole double-faced boss and technological method thereof - Google Patents

Abstract

A stamping and deep-drawing molding die with double-sided bosses in the inner hole, including a concave-convex die that cooperates with each other and an elastic pressure plate, and is characterized in that: the concave-convex die that cooperates with each other has a first pre-forming die and a second pre-forming die And the 3rd molding die, the profile shape of the front end of the punch of the first preforming die is made up of two sections of involutes with different radii, the front end of the punch of the second preforming die has an annular step surface, and the punch of the third molding die The front end profile is composed of multi-level involutes with different radii. The invention adopts simple process, high production efficiency, high utilization rate of raw materials, and has broad practical and economic value.

Description

Stamping and deep drawing forming mold with double-sided boss with inner hole and process method thereof

technical field

The present invention relates to a stamping die and its forming method, in particular to a stamping and drawing forming die with a double-sided boss with an inner hole and a process method thereof.

Background technique

  Today's automobile manufacturers are trying to reduce the weight of the engine and increase its load capacity. Figure 1 and Figure 2 show two high-end pulley products in automobile engines that have emerged as the times require. Because their support webs are located at the center of the belt load and bearings Therefore, they have the advantages of light weight, high strength and large output. They are manufactured by casting or forging billets, which are then turned into pulleys. The disadvantages of this traditional process method are: unstable quality, poor dynamic balance, pores, slag inclusions, looseness, uneven metallographic structure, etc., low production efficiency, low utilization rate of raw materials, labor-intensive and material-intensive processing, and economical processing. high cost. If the round steel plate with holes shown in Figure 3 is used as the blank, let the inner hole first form a double-sided boss with a certain thickness and height, as shown in Figure 6, and then spin the semi-finished product into Figure 1 or Figure 6. 2 pulleys, the manufacturing process will become very simple and easy, and the product quality will inevitably rise to a new level.

In order to obtain double-sided bosses in the inner hole, people in the industry have been exploring, trying to carry out double-sided deep drawing according to the simplest process method, but it is not possible to meet the requirements only by ordinary molds and simple process control, often resulting in The material deforms excessively (beyond the allowable deformation value of the material), the product breaks and has to be scrapped halfway. If the round steel plate with holes is used to produce double-sided bosses in the inner hole by spinning, there will also be many adverse consequences, because the spinning of this shape material will change and destroy the internal structure of the original rolling material. and metal streamlines, thereby greatly reducing the original strength of the metal, and even the finite element analysis of its strength cannot be carried out; at the same time, the spoke surface of the pulley products processed by using this product as a blank is extremely rough and unsightly, so This process method is actually not feasible.

Contents of the invention

The present invention aims to solve the above-mentioned technical defects in the prior art, and provides an inner-hole double-sided boss stamping and deep-drawing forming die and its process with simple process, high production efficiency, high utilization rate of raw materials, and broad practical and economic value. method.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a stamping and drawing forming die with double-sided bosses in the inner hole, which includes a concave-convex die and an elastic pressure plate that cooperate with each other, and is characterized in that: the concave-convex that cooperates with each other The mold has a first preforming mould, a second preforming mould, and a third forming mould. The contour shape of the front end of the punch of the first preforming mold is composed of two sections of involutes with different radii, and the front end of the punch of the second preforming mould. It has an annular step surface, and the front profile of the punch of the third molding die is composed of multiple stages of involutes with different radii.

Further, the inner hole of the elastic pressure plate of the third molding die is provided with a groove.

The process method of stamping and deep-drawing forming of the inner hole double-sided boss using the above mold includes the following specific steps:

Step 1: Position the round steel plate blank with holes on the die of the first preforming mold, press it with an elastic pressure plate, and the hydraulic press drives the punch of the first preforming mold to go down, and press it at a slow speed to form the first preforming mold. a boss;

Step 2: The hydraulic press goes up, the workpiece is taken out, turned over, positioned and placed on the die of the second preforming mold;

Step 3: Press the workpiece on the concave mold of the second preforming mold with an elastic clamping plate, and the hydraulic press drives the punch of the second preforming mold to go down, press and form at a slow speed, and form a micro-projection on the second surface;

Step 4: The hydraulic press goes up, the workpiece is taken out, positioned and placed on the die of the third forming mold;

Step 5: Press the workpiece on the concave mold of the third forming mold with an elastic pressure plate, and the hydraulic press drives the punch of the third forming mold to go down, press and form at a slow speed, and form the second boss;

Step 6: The hydraulic press goes up, and the finished workpiece is taken out.

Further, in the process, the PLC system controls the descending depth and speed of the hydraulic press.

The processed surface of the product produced by the above mold and process method has the same smoothness as the surface of the blank. The internal metallographic structure of the product has the characteristics of continuous metal streamlines and dense structure, and the structural strength of the product is improved.

Description of drawings

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is existing high-strength pulley finished product one;

Fig. 2 is existing high-strength pulley finished product two;

Fig. 3 is the round steel blank with holes used by the present invention;

Fig. 4 is the finished workpiece of the first preforming mold of the present invention;

Fig. 5 is the finished workpiece of the second preforming mold of the present invention;

Fig. 6 is the inner hole double-sided boss forming part made by the present invention;

Fig. 7 the first preforming mold of the present invention;

Fig. 8 the second preforming mold of the present invention;

Fig. 9 the third molding die of the present invention;

Fig. 10 is the internal metallographic photo of the workpiece made by the present invention;

Fig. 11 is the internal metallographic photo of prior art made workpiece;

Among them: 1. Round steel plate blank, 11. Inner hole, 12. First boss, 13. Micro boss on the second surface, 14. Second boss, 2. Die, 3. Elastic pressure plate, 4. The first preforming punch, 5, the second preforming punch, 6, the third forming punch, 7, the third forming elastic pressure plate.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 and Figure 2 show the structural diagrams of two high-end pulley products in existing automobile engines.

Fig. 3, Fig. 4, Fig. 5, and Fig. 6 show the changes from the round steel blank 1 to the double-sided boss workpiece through mold processing.

Fig. 7 is the first preforming mold, which includes a die 2, a punch 4, and an elastic hold-down plate 3, and the contour shape of the front end of the punch 4 is composed of two sections of involutes with different radii. Position the round steel blank 1 on the die 2, press the round steel blank 1 with the elastic pressure plate 3, the center line of the punch 4 is aligned with the center line of the inner hole 11 of the round steel blank 1, and the hydraulic press drives the punch 4 Downward and slow press molding to form the first boss 12, and the first preforming mold completes the workpiece as shown in FIG. 4 .

Fig. 8 is a second preforming mold, which includes a die 2, a punch 5, and an elastic hold-down plate 3, and the front end of the punch 5 has an annular stepped surface. The workpiece completed by the first preforming mold is turned over and positioned on the die 2, the size of the annular step surface of the punch 5 is matched with the first boss 12 of the round steel plate blank 1, and the elastic pressure plate 3 is pressed Tighten the round steel plate blank 1, and the hydraulic press drives the punch 5 to go down and press it at a slow speed to form the second surface miniature boss 13, and the second preforming mold completes the workpiece as shown in Figure 5.

Fig. 9 is the 3rd molding die, comprises die 2, punch 6, the 3rd forming elastic binder plate 7, the front profile of punch 6 is made up of the involute line of multistage different radius, elastic binder plate 7 inner hole There are grooves. Position the workpiece completed by the second preforming mold on the die 2, press the round steel plate blank 1 with the elastic clamping plate 3, the groove on the third forming elastic clamping plate 7 and the first round steel plate blank 1 A boss 12 cooperates with each other, and the hydraulic press drives the punch 6 to descend slowly to press and form the second boss 14, and the third forming mold completes the workpiece as shown in Figure 6 .

Fig. 10 and Fig. 11 are the internal metallographic photos of the products manufactured by the present invention and the internal metallographic photos of the products manufactured by the prior art respectively. By comparison, it is found that in the products manufactured by the prior art, the metal streamlines in the product metallographic images are obviously cut off , the structure density remains unchanged, while the metallographic diagram of the product manufactured by the present invention has continuous metal streamlines, dense structure, and improved structural strength of the product.

Although the invention has been particularly shown and described in connection with preferred embodiments, it will be understood to those skilled in the art that changes in form and details of the invention have been made without departing from the spirit and scope of the invention as defined by the appended claims. All changes are within the protection scope of the present invention.

Claims (4)

1. A stamping and drawing forming die with double-sided bosses in the inner hole, comprising a concave-convex die and an elastic binder plate that cooperate with each other, it is characterized in that: the concave-convex die that cooperates with each other has a first pre-forming die, a second pre-forming die Forming mold and the third forming mold, the profile shape of the front end of the punch of the first preforming mold is composed of two sections of involutes with different radii, the front end of the punch of the second preforming mold has an annular step surface, and the front end of the punch of the third forming mold The front profile of the punch is composed of multi-level involutes with different radii. 2. The stamping and drawing forming mold for double-sided bosses with inner holes according to claim 1, characterized in that: the inner hole of the elastic binder plate of the third forming mold is provided with a groove. 3. A process method for stamping and deep-drawing forming of double-sided bosses with inner holes, using the die for stamping and deep-drawing forming of double-sided bosses with inner holes according to claim 1 or 2, characterized in that: comprising the following steps: Step 1: Position the round steel plate blank with holes on the die of the first preforming mold, press it with an elastic pressure plate, and the hydraulic press drives the punch of the first preforming mold to go down, and press it at a slow speed to form the first preforming mold. a boss; Step 2: The hydraulic press goes up, the workpiece is taken out, turned over, positioned and placed on the die of the second preforming mold; Step 3: Press the workpiece on the concave mold of the second preforming mold with an elastic clamping plate, and the hydraulic press drives the punch of the second preforming mold to go down, press and form at a slow speed, and form a micro-projection on the second surface; Step 4: The hydraulic press goes up, the workpiece is taken out, positioned and placed on the die of the third forming mold; Step 5: Press the workpiece on the concave mold of the third forming mold with an elastic pressure plate, and the hydraulic press drives the punch of the third forming mold to go down, press and form at a slow speed, and form the second boss; Step 6: The hydraulic press goes up, and the finished workpiece is taken out. 4. The process method for stamping and deep-drawing forming of double-sided bosses with inner holes according to claim 3, characterized in that the speed and depth of the hydraulic press are controlled by the PLC system.