Method for Designing Mold Waterway with Rapid Cooling and Heating

Abstract

The present invention discloses a method for designing a rapid cooling and heating mold water channel, comprising: S1: selecting steel suitable for rapid cooling and heating according to the use requirements of the mold core; S2: designing the diameter of the water channel in the mold core, the spacing between two adjacent water channels, and the distance from the center of the water channel to the mold core surface according to the heating and cooling rate requirements; S3: dividing the mold core into two halves with the center line of the water channel as the center, providing receiving grooves at certain intervals on the same water channel of the two halves of the mold core, and placing steel balls in the receiving grooves; S4: butting the two halves of the mold core and performing a high-temperature sintering treatment to form the two halves of the mold core into a whole; S5: machining a forming surface on the mold core surface that fits the contour of the product according to the contour of the product. The present invention designs the specific structure of the water channel in the mold core according to the requirements of rapid cooling and heating. By arranging steel balls in the water channel, the steel balls are used to support the water channel while promoting the flow rate of water in the water channel, thereby improving the heat exchange efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of molds, and in particular relates to a method for designing a rapid cooling and heating mold water channel. Background Art

[0002] As demands for the structural appearance of automotive lighting products continue to rise, the acceptance of weld lines, particularly on plastic products, is declining. In particular, the bezels for front and rear lights are being pushed to be both functional and aesthetically pleasing. Currently, rapid cooling and heating methods are commonly used to eliminate weld lines in taillight bezels, achieving both functionality and aesthetics. During rapid cooling and heating, the water channel needs to be placed as close to the mold core as possible, bringing the water channel closer to the product. However, this proximity can easily cause deformation of the mold core between the product and the water channel during mold compression, and in severe cases, cracking. Therefore, achieving a balance between rapid cooling and heating and maintaining mold core strength is difficult during the water channel design process. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, the present invention proposes a rapid cooling and heating mold water channel design method, which has the advantages of achieving rapid cooling and heating while improving the strength and service life of the mold core.

[0005] According to an embodiment of the present invention, a method for designing a rapid cooling and heating mold water channel includes: S1: selecting a steel material suitable for rapid cooling and heating according to the use requirements of the mold core; S2: designing the diameter of the water channel in the mold core, the spacing between two adjacent water channels, and the distance from the center of the water channel to the mold core surface according to the heating and cooling rate requirements; S3: dividing the mold core into two halves with the center line of the water channel as the center, and providing receiving grooves at certain intervals on the same water channel of the two halves of the mold core, and placing steel balls in the receiving grooves; S4: connecting the two halves of the mold core and performing high-temperature sintering treatment to form the two halves of the mold core into a whole; S5: processing a molding surface on the mold core surface that fits the product contour according to the product contour.

[0006] According to one embodiment of the present invention, in S1 , the hardness of the selected steel is 46-52 HRC.

[0007] According to one embodiment of the present invention, in S1, the steel selected is Xiongfeng XFP81R or Japanese CENA1.

[0008] According to one embodiment of the present invention, in S2, the rate of heating and cooling is proportional to the diameter of the water channel, the rate of heating and cooling is proportional to the distance between two adjacent water channels, and the rate of heating and cooling is inversely proportional to the distance from the center of the water channel to the mold core surface.

[0009] According to an embodiment of the present invention, the ratio of half of the distance between two adjacent water channels to the distance from the center of the water channel to the mold core surface is less than or equal to tan22.5°.

[0010] According to an embodiment of the present invention, the diameter of the water channel is 6 mm, the distance between two adjacent water channels is 10 mm, and the distance from the center of the water channel to the mold core surface is 5 / tan22.5° mm.

[0011] According to an embodiment of the present invention, in S3, the distance between two adjacent steel balls in the same water channel is 80 mm, the bottom surface of the receiving groove is formed as an arc surface, the radius corresponding to the arc surface is 5 mm, and the diameter of the steel ball is 8 mm.

[0012] According to an embodiment of the present invention, in S4, the temperature of the high-temperature sintering treatment is 1000 - 1200 °C.

[0013] According to an embodiment of the present invention, in S3, it is also necessary to polish the connection between the receiving groove and the water channel smoothly.

[0014] According to an embodiment of the present invention, in S5, a forming surface that fits the product contour is machined by CNC.

[0015] The beneficial effect of the present invention is that the present invention designs the specific structure of the water channel in the mold core according to the requirements of rapid cooling and heating. By arranging steel balls in the water channel, while using the steel balls to support the water channel, the flow rate of water in the water channel is promoted, and the heat exchange efficiency is improved.

[0016] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention.

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments with reference to the accompanying drawings, wherein:

[0019] Figure 1 is a flowchart of a method for designing a mold water channel for rapid cooling and heating according to an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional structural schematic diagram of a mold water channel for rapid cooling and heating according to an embodiment of the present invention;

[0021] Figure 3It is a schematic cross-sectional structure view of the mold water channel with rapid cooling and heating according to an embodiment of the present invention from another angle; Detailed implementation manners

[0022] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] The design method of the mold water channel with rapid cooling and heating according to the embodiment of the present invention will be specifically described below with reference to the drawings.

[0026] As Figure 1 and Figure 3As shown, the method for designing the mold waterway with rapid cooling and heating according to Embodiment 1 of the present invention includes: S1: Select steel suitable for rapid cooling and heating according to the usage requirements of the mold core; S2: Design the diameter of the waterway in the mold core, the distance between two adjacent waterways, and the distance from the center of the waterway to the mold core surface according to the requirements of the heating and cooling rates; S3: Divide the mold core into two halves with the center line of the waterway as the center, provide accommodation grooves at certain intervals on the same waterway of the two halves of the mold core, and place steel balls in the accommodation grooves; S4: Dock the two halves of the mold core and perform high-temperature sintering treatment to form the two halves of the mold core into an integral body; S5: Machine a forming surface that conforms to the product contour on the mold core surface according to the product contour.

[0027] According to an embodiment of the present invention, in S1, the hardness of the selected steel is 46 - 52 HRC. Further, in S1, the selected steel is Xiongfeng XFP81R or Japanese CENA1. That is to say, in the selection of steel, certain hardness conditions need to be met so that the hardness of the entire mold core can withstand the pressure during the operation of the mold, and at the same time, the advantages of easy processing should be taken into account.

[0028] Further, in S2, the heating and cooling rates are proportional to the diameter of the waterway, the heating and cooling rates are proportional to the distance between two adjacent waterways, and the heating and cooling rates are inversely proportional to the distance from the center of the waterway to the mold core surface. In other words, the parameters related to rapid cooling and heating are the diameter of the waterway, the distance between two adjacent waterways, and the distance from the center of the waterway to the mold core surface, as Figure 2 and Figure 3 shown, Figure 2 The cross-section direction of Figure 3 is the radial direction of the waterway, the cross-section direction of Figure 3 is the axial direction of the waterway. The distance from the center of the waterway to the mold core surface is represented by A, the distance between two adjacent waterways is represented by B, the plane above the waterway forms the mold core surface, and the angle at which the waterway acts on the mold core surface is represented by C. Since the product needs to be formed on the mold core surface, the smaller A is, the faster the heating and cooling rates are, the smaller B is, the faster the heating and cooling rates are, and the larger the diameter of the waterway is, the faster the heating and cooling rates are.

[0029] And in order to meet the strength requirements and avoid the mold core from being deformed and cracked under pressure, during the design, the ratio of half of the distance between two adjacent waterways to the distance from the center of the waterway to the mold core surface is less than or equal to tan22.5°. Further, the diameter of the waterway is 6 mm, the distance between two adjacent waterways is 10 mm, and the distance from the center of the waterway to the mold core surface is 5 / tan22.5° mm. Furthermore, in S3, the distance between two adjacent steel balls in the same waterway is 80 mm, the bottom surface of the accommodation groove forms an arc surface, the radius corresponding to the arc surface is 5 mm, and the diameter of the steel ball is 8 mm. In Figure 3The distance between two adjacent steel balls is represented by D. In terms of heat conduction effect, the range of the angle C of the water channel acting on the mold core surface is preferably less than or equal to 45°. Therefore, in order to achieve a better heat transfer effect and meet the strength requirements at the same time, through calculation by a heat simulation analysis software, on the premise of meeting the heat transfer rate, the diameter of the water channel is reduced as much as possible, the distance between two adjacent water channels is increased, and the distance from the center of the water channel to the mold core surface is increased. Therefore, in this embodiment, the diameter of the water channel is designed to be 6 mm, the distance between two adjacent water channels is designed to be 10 mm, and the distance from the center of the water channel to the mold core surface is designed to be 5 / tan22.5° mm. At this time, the water channel can meet the requirements of rapid cooling and heating, and at the same time, the strength of the mold core is improved as much as possible. On the other hand, steel balls are arranged in the water channel. On the one hand, the steel balls can support the water channel to prevent the water channel from deforming after the mold core is stressed. On the other hand, due to the Bernoulli principle and the Venturi effect, when water flows through the surface of the steel balls, the flow velocity of water on the surface of the steel balls increases and the pressure decreases. The increase in flow velocity will further improve the refrigeration or heating efficiency.

[0030] According to an embodiment of the present invention, in S4, the temperature of the high-temperature sintering treatment is 1000-1200°C. The water channel is divided into two symmetrical parts along the axial direction for processing. After the steel balls are placed, it is then formed into a whole by high-temperature sintering.

[0031] On this basis, in S3, the connection between the receiving groove and the water channel also needs to be polished smoothly. Such a design can avoid the concentration of gravitational force and prevent the internal cracking of the water channel.

[0032] According to an embodiment of the present invention, in S5, a forming surface that fits the contour of the product is machined by CNC. CNC machining is more automated, has higher efficiency, and has a high degree of fit with the product contour.

[0033] According to the requirements of rapid cooling and heating, the present invention selects a steel material with high hardness and easy processing, designs the diameter and specific position of the water channel in the mold core. By arranging steel balls in the water channel, while using the steel balls to support the water channel, the flow velocity of water in the water channel is promoted, and the heat exchange efficiency is improved, so that the mold core takes into account the use requirements of rapid cooling and heating and high strength.

[0034] In the description of this specification, the descriptions with reference to the terms "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for designing the water channel of a mold with rapid cooling and heating, characterized in that including, S1: According to the usage requirements of the mold core, select steel suitable for rapid heating and cooling; S2: According to the requirements of the heating and cooling rates, design the diameter of the water channels in the mold core, the distance between adjacent two water channels, and the distance from the center of the water channel to the mold core surface; S3: Divide the mold core into two halves with the center line of the water channel as the center. Accommodating grooves are provided at regular intervals on the same water channel of the two half mold cores, and steel balls are placed in the accommodating grooves; S4: Dock the two half mold cores and perform high-temperature sintering treatment to form the two half mold cores into a whole; S5: Machine a forming surface that fits the product contour on the mold core surface; In S2, the heating and cooling rates are proportional to the diameter of the water channel, the heating and cooling rates are proportional to the distance between adjacent two water channels, and the heating and cooling rates are inversely proportional to the distance from the center of the water channel to the mold core surface; the ratio of half of the distance between adjacent two water channels to the distance from the center of the water channel to the mold core surface is less than or equal to tan22.5°; the diameter of the water channel is 6mm, the distance between adjacent two water channels is 10mm, and the distance from the center of the water channel to the mold core surface is 5 / tan22.5°mm; In S3, the distance between adjacent two steel balls in the same water channel is 80mm, the bottom surface of the accommodating groove forms an arc surface, the radius corresponding to the arc surface is 5mm, and the diameter of the steel ball is 8mm.

2. The rapid cooling and heating mold waterway design method according to claim 1, characterized in that, In S1, the hardness of the selected steel is 46 - 52HRC.

3. The method for designing a mold waterway with rapid cooling and heating according to claim 1, wherein In S4, the temperature of the high-temperature sintering treatment is 1000 - 1200°C.

4. The method for designing the mold water channel with rapid cooling and heating according to claim 1, characterized in that, In S3, it is also necessary to polish the connection between the accommodating groove and the water channel smoothly.

5. The rapid cooling and heating mold waterway design method according to claim 1, characterized in that In S5, use CNC to machine a forming surface that fits the product contour.

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