TWI387493B - Design method and structure of bar extrusion die - Google Patents

Description

Design method and structure of bar extrusion die

The invention relates to a mold design method and a structure thereof, in particular to a design method of a bar extrusion die and a structure thereof.

As shown in Figures 1 and 2, the conventional bar extrusion die 10 has a spindle 11 and a finished product outlet 12 that communicates with the spindle 11 in an extrusion process by first pressing an ingot 30 (or The pressed cake is placed in the spindle 11 and then extruded by an extrusion rod (not shown) to shape the rod and extrude through the finished product outlet 12, however, please refer to In the second figure, the conventional bar extrusion die 10 is poorly designed, and it is easy to produce a material in the bar extrusion process, and the material inclusion situation not only leads to a reduction in the length of the finished product and an increase in waste, but also makes the production. The cost has increased dramatically.

The main object of the present invention is to provide a method for designing a bar extrusion die and a structure thereof, the design method comprising providing a bar extrusion die, the bar extrusion die having a spindle and a finished product outlet And an inclined portion formed between the spindle and the finished product outlet, the spindle has a first radius (r _i ), the finished outlet has a second radius (r _f ), and the finished product The outlet system defines a center line and a reference line perpendicular to the center line, the inclined portion has a beveled edge and a tilt angle (α) sandwiched between the beveled edge and the reference line; Calculating a product extrusion ratio (E _R ) by the first radius (r _i ) and the second radius (r _f ) of the finished product outlet; and calculating the inclined portion by using the product extrusion ratio (E _R ) The inclination angle (α), the bar extrusion die designed by the design method of the invention can effectively reduce the occurrence of the material, and the effect can increase the length of the finished product, reduce the waste and reduce the waste. production cost.

Please refer to Figures 3 and 4, which are a preferred embodiment of the present invention, a method for designing a bar extrusion die, the steps of which are detailed as follows: First, please refer to step (s1) and 4, a bar extrusion die 20 is provided, the bar extrusion die 20 having a spindle 21, a finished outlet 23, and an inclined portion formed between the spindle 21 and the finished outlet 23. 22, the spindle 21 is for placing an extruded ingot (not shown), and the spindle 21 has a first radius (r _i ), and the finished outlet 23 has a second radius (r _f ), and the finished product outlet 23 defines a center line C and a reference line L perpendicular to the center line C. The inclined portion 22 has a beveled edge 22a and a pair of the beveled edge 22a and the reference line L The inclination angle (α) between; after that, refer to the step (s2) of FIG. 3, according to the first radius (r _i ) of the spindle 21 and the second radius of the finished product outlet 23 (r _f Calculating a product extrusion ratio (E _R ), in this embodiment, the product extrusion ratio (E _R ) is calculated as E _R =r _i ² /r _f ² , for example, the spindle The first radius (r _i ) of 21 is 20 When the second radius (r _f ) of mm and the finished product outlet 23 is 5 mm, the product extrusion ratio (E _R ) is equal to 16; finally, please refer to the step (s3) of Figure 3, using the product to extrude The inclination angle (α) of the inclined portion 22 is calculated by the ratio (E _R ). In the present embodiment, the calculation formula of the inclination angle (α) is α = AE _R ² + BE _R + C, where the constant A The system is between -0.002 and -0.006, the constant B is between 0.03 and 0.13, and the constant C is between 25 and 45. The preferred constants A, B and C are -0.0031, 0.0406, respectively. And 35.24, in addition, the design method of the present invention is applicable to the design of various metal bar extrusion molds, and is particularly suitable for the design of aluminum alloy bar extrusion molds.

Please refer to Fig. 5, which is a view showing the extrusion result of the bar extrusion die of the conventional non-inclined design (α = 0°) when the product extrusion ratio (E _R ) is equal to 40, which is shown in Fig. 5. As a result, it can be seen that when the extruded ingot 30 (press cake) is placed in the ingot cylinder 11, the entrainment condition has already occurred, that is, the entrainment condition is generated in the ingot cylinder 11, resulting in a decrease in the length of the finished product and an increase in the scrap. .

On the contrary, please refer to FIG. 6 , which is a diagram showing the extrusion result of a specific design example of the present invention. In this design example, when the product extrusion ratio (E _R ) is equal to 40, according to the formula α=-0.0031E _R ² +0.0406E _R +35.24 can determine that the inclination angle (α) of the inclined portion 22 is equal to 31.9°, and as a result of the sixth figure, the extruded ingot 30 (pressing cake) is located in the spindle tube 21. At the time, no material is generated, that is, no material is produced in the ingot tube 21, which proves that the bar extrusion mold designed by the design method of the invention can effectively reduce the occurrence of the material, and In addition to improving the length of the finished product, it can reduce waste and reduce production costs.

The scope of the present invention is defined by the scope of the appended claims, and any changes and modifications made by those skilled in the art without departing from the spirit and scope of the invention are within the scope of the present invention. .

10‧‧‧Knowledge bar extrusion mould

11‧‧‧Ingots

12‧‧‧ Finished product export

20‧‧‧Bar extrusion mould

21‧‧‧Ingots

22‧‧‧ inclined section

22a‧‧‧Bevel

23‧‧‧ Finished product export

30‧‧‧Extrusion

C‧‧‧ center line

L‧‧‧ baseline

‧‧‧‧Tilt angle

E _R ‧‧‧Product extrusion ratio

r _i ‧‧‧first radius

r _f ‧‧‧second radius

A, B, C‧‧ ‧ constant

S1‧‧‧ provides a bar extrusion die having a spindle, a finished product outlet and an inclined portion formed between the spindle and the finished product outlet, the spindle Having a first radius (r _i ), the finished product outlet has a second radius (r _f ), and the finished product outlet defines a center line and a reference line perpendicular to the center line, the inclined portion has a a hypotenuse and a tilt angle (α) between the hypotenuse and the reference line

S2‧‧‧ calculating a product extrusion ratio (E _R ) based on the first radius (r _i ) of the ingot and the second radius (r _f ) of the finished product outlet

S3‧‧‧ Calculate the inclination angle (α) of the inclined portion using the product extrusion ratio (E _R )

Figure 1: Schematic diagram of a conventional bar extrusion die.

Fig. 2 is a graph showing the results of the phenomenon of encapsulation during the extrusion process of the conventional bar extrusion die.

Figure 3 is a flow chart showing a method of designing a bar extrusion die in accordance with a preferred embodiment of the present invention.

Figure 4 is a schematic view showing the structure of the bar extrusion die in accordance with a preferred embodiment of the present invention.

Figure 5: Extrusion results of a bar extrusion die without a tilted portion design when the product extrusion ratio (E _R ) is equal to 40.

Fig. 6 is a graph showing the extrusion results of a specific design example of the present invention when the product extrusion ratio (E _R ) is equal to 40.

20‧‧‧Bar extrusion mould

21‧‧‧Ingots

22‧‧‧ inclined section

22a‧‧‧Bevel

23‧‧‧ Finished product export

C‧‧‧ center line

L‧‧‧ baseline

‧‧‧‧Tilt angle

r _i ‧‧‧first radius

r _f ‧‧‧second radius

Claims (7)

A bar extrusion die design method includes: providing a bar extrusion die, the bar extrusion die having a spindle, a finished product outlet, and a formed in the spindle and the finished product outlet An inclined portion having a first radius (r _i ), the finished product outlet having a second radius (r _f ), and the finished product outlet defining a center line and a vertical center line a reference line, the inclined portion has a beveled edge and an inclination angle (α) disposed between the beveled edge and the reference line; according to the first radius (r _i ) of the ingot cylinder and the finished product outlet The second radius (r _f ) calculates a product extrusion ratio (E _R ), and the product extrusion ratio (E _R ) is calculated as E _R =r _i ² /r _f ² ; and the product is squeezed The inclination ratio (α) of the inclined portion is calculated by the ratio (E _R ), and the calculation formula of the inclination angle (α) is α = AE _R ² + BE _R + C. The method for designing a bar extrusion die according to claim 1, wherein the constant A is between -0.002 and -0.006. The method for designing a bar extrusion die according to claim 2, wherein the constant A is -0.0031. The method for designing a bar extrusion die according to claim 1, wherein the constant B is between 0.03 and 0.13. A method for designing a bar extrusion die as described in claim 4, wherein the constant B is 0.0406. The method for designing a bar extrusion die according to claim 1, wherein the constant C is between 25 and 45. The method for designing a bar extrusion die as described in claim 6 wherein the constant C is 35.24.