TW201321157A - Mold and method for sectionally adjusting cooling efficiency of the mold - Google Patents

Abstract

A mold and a method for sectionally adjusting a cooling efficiency of the mold are provided. The method comprises steps of configuring at least one cooling channel including a first section and a second section in a mode, wherein the first section includes a first heat-dissipating inner surface area and the second section includes a second heat dissipating inner surface area; and inconsistently adjusting the first heat dissipating inner surface area and the second heat dissipating inner surface area.

Description

Method for adjusting mold cooling efficiency by mold and section

The invention relates to a mold and a method for adjusting the cooling efficiency of the mold, in particular to a hot stamping die and a method for adjusting the cooling efficiency of the hot stamping die.

The conventional rapid mold cooling water channel is formed by drilling a cooling water channel with a drilling machine after the cavity is formed, so that the cooling water can flow in the cooling water channel. The drilling machine can only drill straight pipelines, so the cooling water channel has only the vertical and horizontal directions. However, the contours of the cavity often have curves or curvatures, so that the distance between the cooling water channel and the cavity contour is different. The problem of different cooling effects and poor temperature control results.

The hot stamping technology has the advantages of easy forming, good mechanical properties after forming parts, and less rebound. In this process, the material is heated to above 900 ° C, and rapid cooling after forming greatly increases the strength of the product. For hot stamping dies, the cooling (quenching) efficiency has a great influence on the mechanical properties of the finished products. In particular, the hot stamping dies are currently increasing in the automotive industry. Based on safety and weight reduction considerations, the mechanical properties of the finished products. (such as hardness, shock absorption) is increasingly valued.

The conventional cooling passage layout only considers the heat dissipation of the mold base, and does not elaborate on the precise calculation of the uniform heat transfer during the stamping process or after the stamping, and the design of the cooling water channel structure, resulting in uneven mechanical properties or even deformation and fracture of the finished product. .

In the prior art, there is provided a method of changing the cooling rate by using a change in the amount of water, a change in the size of a metal mold, or the like. By controlling the cooling rate of the mold, it is possible to solve the problem that the steel sheet is broken due to the excessive cooling rate of the steel sheet. However, it is too time-consuming to calculate the size of the metal mold for the cooling rate each time the mold is made, and the above method cannot be used to form a product having two or more mechanical properties.

In view of the limitation that the drilling method can only drill the straight hole, the distance between the cooling pipe and the surface of the concave mold is not equal, which inevitably causes uneven cooling. The prior art provides a hot stamping forming die in which the longitudinal height is equal. The cooling pipe is used to solve the problem that the mold is difficult to uniformly cool and the surface shape is complicated and the mold cooling pipe is difficult to open. The above prior art mentions that the arrangement of the cooling ducts and the plurality of cooling ducts having different widths can be utilized to ensure the mechanical strength of the mold, but the above manner makes the arrangement of the cooling ducts more complicated, and the above method cannot be used to form two. A product of the above mechanical properties. Furthermore, limited by the shape of the mold, it is sometimes not feasible to increase the density of the cooling duct.

The cooling passage structure design of the present invention can accurately control the cooling rate of different parts in sections by controlling the heat dissipating surface area of different parts in the same mold without changing the passage density or the amount of water, so as to stably stabilize the product according to the product demand. Different parts create different mechanical properties, such as different strengths.

One of the objectives of the present invention is to provide a method for controlling the cooling rate of a mold in a section, comprising: providing at least one cooling passage in a mold, the at least one cooling passage comprising a first segment and a second segment, wherein the A segment includes a first heat dissipating inner surface area, and the second segment includes a second heat dissipating inner surface area; and utilizing a heat dissipating component to non-uniformly adjust the first heat dissipating inner surface area and the second heat dissipating inner surface area.

Another object of the present invention is to provide a method for controlling the cooling rate of a mold in a section, comprising: providing a cooling passage in a mold; and disposing at least one heat dissipating component in the cooling passage to make the cooling passage have a non-uniform heat dissipation Surface area.

Another object of the present invention is to provide a mold comprising: a cooling passage means; and a heat dissipating member disposed in the cooling passage means such that the cooling passage means has a non-uniform heat dissipating inner surface area.

The case can be further explained by the following detailed explanation:

The invention will be further described in detail by the following preferred embodiments and the accompanying drawings.

How to provide and utilize an improved design for the cooling passage of the mold (especially the hot stamping die), so that the product can be distributed in a part of the cooling process during the forming and cooling process, thereby achieving high precision demand and control during product production. The different mechanical properties of the same product are one of the problems that the inventors of the present invention are trying to solve.

The present invention solves the above problems by increasing the heat dissipating surface area of a specific region in the cooling passage of the mold. Two embodiments for increasing the aforementioned heat dissipation surface area are provided below, however the concept of the present invention is not limited to the following embodiments.

Please refer to Fig. 1, which is a cross-sectional view of the lower mold of the first embodiment of the present invention. The lower mold 10 of the mold of the first embodiment includes a plurality of cooling passages 11 including heat dissipating members 12 to increase the heat dissipating surface area of the interior of the cooling passages 11 in contact with the cooling medium. The cooling medium described above comprises water, steam, liquid nitrogen, oil, air, and/or other materials used to cool the mold and cool articles or products that may remain in the mold. In the present embodiment, the locked fins are used as the heat dissipating member 12, however, any structure that can increase the heat dissipating surface area in the cooling passage 11 can be used as the heat dissipating member 12. The heat dissipating component 12 is a replaceable component that can optionally be placed anywhere in the cooling passage 11 or, as appropriate. In addition, according to actual needs, the cooling passage may also be disposed in a corresponding upper mold of the lower mold 10 (not shown), and the heat dissipating member 12 may also be selectively disposed in the cooling passage of the upper mold.

Please refer to FIG. 2, which is a schematic cross-sectional view of the cooling passage of the second embodiment of the present invention. In this embodiment, the flexible copper foil 20 is folded into a shape suitable for the passage, and is fixed to the inner tube wall 22 of the passage as a heat dissipating member provided in the passage to increase the heat dissipating surface area. The fixing of the copper foil 20 can be performed by a fixing member 21 such as a screw, a suitable adhesive, or welding. In addition, any material having a high thermal conductivity, such as gold, silver, aluminum, aluminum alloy, or the like, may be provided in the cooling passage in place of the copper foil in various shapes such as a sheet shape, a block shape or an irregular shape to increase the heat dissipation surface area. .

The first and second embodiments described above can be made in a variety of ways well known in the art for making molds. The manufacturing methods provided below are merely exemplary methods for fabricating the first embodiment, the method comprising the steps of providing a lower mold base 30. , having the same outer shape as the first embodiment of the present invention (as shown in FIG. 3A); one or more cooling passages 31 are disposed on the working surface of the lower mold base 30 by machining or other suitable means (eg, 3B) The lower mold shell 32 (shown in FIG. 3C) is provided, and the lower mold shell 32 preferably has a uniform thickness, so that when the lower mold shell 32 covers the lower mold base 30, the cooling passage 31 can be The working surfaces are separated by a fixed distance (ie, the thickness of the lower mold shell 32) to provide a more uniform heat dissipation effect; fins 33 (as shown in FIG. 3D) and/or other adjustment elements required to adjust the heat dissipation surface area; The fins 33 are fixed to the opposite surfaces of the lower surface of the lower mold case 32 by screws or other fixing means, or are fixed to the inner surface of the cooling passage reserved in the lower mold base 30; and the lower mold shell 32 is covered by the lower mold. Seat 30 to form its cooling passage Adjust the lower surface of the heat dissipation surface area (as shown in Figure 3E). At a specific area of the lower mold 30, the heat dissipating surface area at the specific area can be adjusted at any time by increasing or decreasing the fins 33 in the cooling passage 31, thereby affecting the product stamped by the mold relative to the specific area. The characteristics of the place.

As can be seen from the above manufacturing process, the adjustment elements (e.g., fins) in this case are replaceable members. As used herein, a heat dissipating component or an adjusting component refers to an element that can be used to adjust the surface area of the heat dissipating surface. Depending on the product requirements, different numbers or different heat dissipation surface area adjustment elements can be placed at different sections, locations or specific points of the cooling passage. For products with more than two mechanical properties, the case can control the firing rate of different sections of the product by controlling the heat dissipation surface area to achieve different mechanical properties of the product in different sections. For example, a car crasher component may have a section to absorb impact energy, and another section must support the car body structure to protect driving safety. For the above two sections, the material must have different mechanical properties to achieve different purposes. .

Please refer to FIG. 4, which is a cross-sectional view of the lower mold of the third embodiment of the present invention. As shown, fins 42 are disposed in the cooling passages 41 at the bottom and right halves of the lower mold 40 to increase the heat dissipation area. Therefore, compared to the left half, the cooling rate of the depressed bottom and right half of the finished product is higher during the process, so that the left and right sides of the finished product will have different mechanical properties. That is, the fins 42 are non-uniformly disposed in the cooling passage 41 such that at least two sections of the cooling passage 41 have different cooling rates. Through the above mold design concept, the heat dissipation surface area can be adjusted or controlled by laying the fins 42 or other structures that can increase the heat dissipation area for the mechanical properties required for each part of the product, so as not to change the original way of routing. It is made into products with various mechanical properties. It should be emphasized that the above-mentioned adjustment or control of the heat dissipation surface area includes increasing or decreasing the number, density or heat dissipation surface area of the heat dissipating component in a specific area. Through the scheme of controlling the heat dissipation surface area in sections, the present invention can have the advantages of not modifying the original mold structure and the cooling passage arrangement, improving the quality (including the complete appearance, precise size, mechanical properties and shape of the finished product), and reducing the defect rate.

The cooling passage of the present case may be a plurality of parallel or unconnected passages or a single cooling circuit, which are collectively referred to as cooling passage devices. When the cooling circuit is connected in parallel or single, the cooling passage means is integrally formed. Preferably, when the cooling passage is passed through the cooling passage inside the mold, the flow rate of the cooling medium can be increased by the vacuum device to accelerate the cooling rate. When there are multiple cooling passages in the mold, the flow rate of the cooling medium in the particular one or more passages can be increased to speed up the cooling rate of the one or more passages through the region. The vacuum device may be a negative pressure pump or a vacuum pump. Preferably, the cooling rate of the particular region is increased or decreased by increasing or decreasing the density of the cooling passage in a particular region of the mold. Preferably, the diameter of the cooling passage is increased or decreased in a particular region of the mold to increase or decrease the rate of cooling of that particular region. The concept of increasing or adjusting the heat dissipating surface area described in the first to third embodiments of the present invention can be used in combination with the above-described manner of adjusting the cooling rate of a specific region.

In the hot stamping process, the cooling efficiency has a great influence on the hardness of the finished product. The concept of using a heat dissipating component to adjust the heat dissipating surface area can improve the strength of a specific part of the product by controlling the cooling efficiency of each part of the mold without changing the channel density or the amount of water, and can also speed up the process. Speed and increase yield to increase overall production value. The technology of this case can stably produce high-strength products, and even tailor-made high-value products with different strengths according to demand. In addition, the technology in this case can also increase production capacity and reduce the non-performing rate. Based on the above, the technology of this case can greatly increase the output value of the applied products.

Example:

A method of controlling a mold cooling rate in a section, comprising: providing at least one cooling passage in a mold, the at least one cooling passage comprising a first segment and a second segment, wherein the first segment comprises a a first heat dissipating inner surface area, wherein the second segment includes a second heat dissipating inner surface area; and utilizing a heat dissipating component to non-uniformly adjust the first heat dissipating inner surface area and the second heat dissipating inner surface area.

2. The method of embodiment 1, wherein the mold is a hot stamping die.

3. The method of any of the preceding embodiments, wherein the heat dissipating component is at least one of a fin and a copper foil structure.

4. The method of any of the preceding embodiments, wherein the heat dissipating component is a replaceable component.

5. The method of any of the preceding embodiments, wherein the first heat dissipation internal surface area is equal to the second heat dissipation internal surface area.

6. The method of any of the preceding embodiments, wherein the adjusted first heat dissipation internal surface area is different from the adjusted second heat dissipation internal surface area.

7. The method of any of the preceding embodiments, wherein the adjusted first heat dissipation internal surface area is greater than the adjusted second heat dissipation internal surface area.

8. The method of any of the preceding embodiments, wherein the adjusted first heat dissipation internal surface area is less than the adjusted second heat dissipation internal surface area.

The method of any of the preceding embodiments, wherein the adjusting comprises increasing at least one of the first heat dissipating inner surface area and the second heat dissipating inner surface area.

The method of any of the preceding embodiments, wherein the adjusting comprises reducing at least one of the first heat dissipating inner surface area and the second heat dissipating inner surface area.

11. A method of controlling a mold cooling rate in sections, comprising: providing a cooling passage means in a mold; and providing at least one heat dissipating element in the cooling passage means such that the cooling passage means has a non-uniform heat dissipating inner surface area.

The method of claim 11, wherein the cooling passage device comprises a first section and a second section, wherein the first section comprises a first heat dissipation inner surface area, and the second section The section includes a second heat dissipating inner surface area equal to the first heat dissipating inner surface area.

The method of any one of the preceding embodiments, wherein the disposing the at least one heat dissipating component comprises disposing the at least one heat dissipating component non-uniformly in the first section and the second section to enable the first The inner surface area of the heat dissipation is different from the inner surface area of the second heat dissipation.

14. A mold comprising: a cooling passage means; and a heat dissipating member disposed in the cooling passage means such that the cooling passage means has a non-uniform heat dissipating inner surface area.

The mold of claim 14, wherein the cooling passage device comprises a first section and a second section, wherein the first section comprises a first heat dissipation inner surface area, and the second section The section includes a second heat dissipating inner surface area equal to the first heat dissipating inner surface area.

16. The mold of any of the above embodiments, wherein the heat dissipating component is non-uniformly disposed in the first section and the second section to allow the first heat dissipation inner surface area and the second heat dissipation surface The surface area is different.

17. The mold of any of the above embodiments, wherein the cooling passage means is integrally formed.

18. The mold of any of the preceding embodiments, wherein the cooling passage means comprises a plurality of cooling passages.

19. The mold of any of the preceding embodiments, wherein the plurality of cooling passages are not connected.

20. The mold of any of the above embodiments, further comprising: a lower die holder for routing a cooling passage to the upper surface thereof; and a lower mold shell disposed on the upper surface of the lower mold base, the lower mold shell The lower surface covers the cooling passage to form the cooling passage means.

The mold according to any of the above embodiments, wherein the heat dissipating member is fixed to a cooling passage relative position of a lower surface of the lower mold case or to an inner surface of the cooling passage of the lower mold base. .

22. A mold comprising: a cooling passage device having a plurality of sections; and an adjustment component device disposed in the cooling passage means for causing at least two of the plurality of sections to pass through the adjustment component means The different phases provided in different regions of the cooling passage device cooperate with the heat dissipating inner surface area to achieve different heat dissipation effects of the cooling passage device in the different regions.

However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent structural changes of the present specification and the illustrated contents are all included in the same. Within the scope of the invention, it is given to Chen Ming.

10, 40. . . Lower die

11, 31, 41. . . Cooling path

12. . . Heat sink

20. . . Copper foil

twenty one. . . Fixed member

twenty two. . . Wall

30. . . Lower mold base

32. . . Lower form

33, 42. . . Fin

Figure 1 is a cross-sectional view of a lower mold of the first embodiment of the present invention;

Figure 2 is a cross-sectional view showing the cooling passage of the second embodiment of the present invention;

3A-3E: an exemplary manufacturing method of the first embodiment of the present invention;

Fig. 4 is a cross-sectional view showing the lower mold of the third embodiment of the present invention.

40. . . Lower die

41. . . Cooling path

42. . . Fin

Claims (10)

A method for controlling a mold cooling rate in a section, comprising: providing at least one cooling passage in a mold, the at least one cooling passage comprising a first segment and a second segment, wherein the first segment comprises a first Cooling the inner surface area, and the second segment includes a second heat dissipating inner surface area; and utilizing a heat dissipating component to non-uniformly adjust the first heat dissipating inner surface area and the second heat dissipating inner surface area. The method of claim 1, wherein the mold is a hot stamping die. The method of claim 1, wherein the heat dissipating component is at least one of a fin and a copper foil structure. The method of claim 1, wherein the adjusted first heat dissipation internal surface area is different from the adjusted second heat dissipation internal surface area. The method of claim 1, wherein the adjusting comprises increasing at least one of the first heat dissipating inner surface area and the second heat dissipating inner surface area. The method of claim 1, wherein the adjusting comprises reducing at least one of the first heat dissipating inner surface area and the second heat dissipating inner surface area. A method for controlling a mold cooling rate in a section, comprising: providing a cooling passage in a mold; and disposing at least one heat dissipating member in the cooling passage such that the cooling passage has a non-uniform heat dissipating inner surface area. A mold comprising: a cooling passage device; and a heat dissipating member disposed in the cooling passage device such that the cooling passage device has a non-uniform heat dissipating inner surface area. The mold of claim 8, further comprising: a lower mold base for providing a cooling passage on the upper surface thereof; and a lower mold shell disposed on the upper surface of the lower mold base, the lower mold base A surface covers the cooling passage to form the cooling passage means. The mold of claim 9, wherein the heat dissipating member is fixed to a position of a cooling passage of a lower surface of the lower mold case or to an inner surface of the cooling passage of the lower mold base.