A precision die hot stamping process

Abstract

The present application relates to a kind of precision mould hot stamping processes, dust impurities and oil dirt on blank are cleaned by blank cleaning step.The blank cleaned is heated to austenite state by first heating step.The blank after first heating is first hot stamped to obtain first preliminary blank by first hot stamping step.The first preliminary blank is shaped and cut to obtain second preliminary blank by first preliminary blank shaping step.The second preliminary blank is evenly thermal sprayed with hot stamping paint to obtain third preliminary blank by second preliminary blank processing step.The third preliminary blank is heated to austenite state by second heating step.The third preliminary blank after second heating is second hot stamped to obtain fourth preliminary blank by second hot stamping step.The fourth preliminary blank is edge trimmed and polished to obtain precision mould by fourth preliminary blank polishing step.

Description

Technical Field

[0001] This invention relates to the field of precision mold processing, and in particular to a hot stamping process for precision molds. Background Technology

[0002] A mold is a tool used to shape a blank into a part with a specific shape and size under the action of external force. In industrial production, various molds and tools are used to obtain the desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. A mold has a specific contour or internal cavity shape; by using a contour shape with cutting edges, the blank can be separated according to the contour line. A mold generally consists of two parts: a moving mold and a fixed mold (which can be separated and joined). When separated, the part is removed; when joined, the blank is injected into the mold cavity to form the part. Molds are precision tools with complex shapes, withstand the expansion force of the blank, and have high requirements for structural strength, rigidity, surface hardness, surface roughness, and machining accuracy.

[0003] However, molds obtained by traditional hot pressing processes have low precision, poor corrosion resistance, and low structural strength. Summary of the Invention

[0004] Therefore, it is necessary to provide a precision mold hot stamping process to address the technical problems of low precision, poor corrosion resistance, and low structural strength of molds obtained by traditional hot pressing processes.

[0005] A precision mold hot stamping process, the process comprising the following steps: Raw material cleaning steps: Remove dust, impurities, and oil stains from the raw material; First heating step: Place the cleaned billet into the heating furnace and heat it to the austenitic state; First hot stamping step: The preform after the first heating is subjected to the first hot stamping to obtain the first preform; First pre-form blank shaping step: The first pre-form blank is shaped and cut to obtain the second pre-form blank; Second preform processing step: Hot stamping coating is uniformly sprayed onto the second preform to obtain the third preform; Second heating step: Place the third pre-formed blank into the heating furnace and heat it to the austenitic state; Second hot stamping step: The third pre-formed blank, after being heated for the second time, is subjected to a second hot stamping to obtain the fourth pre-formed blank; Fourth pre-form blank polishing step: Trim, polish and grind the fourth pre-form blank to obtain a precision mold.

[0006] In one embodiment, in the second pre-form material processing step, the hot stamping coating comprises the following components in parts by weight: 8 to 16 parts aluminum powder, 10 to 20 parts zinc-iron alloy powder, 8 to 14 parts magnesium oxide, 9 to 15 parts vermiculite powder, 7 to 16 parts silica powder, and 20 to 50 parts phenolic resin.

[0007] In one embodiment, a high-pressure water gun is used to remove dust and impurities from the blank.

[0008] In one embodiment, an oil remover is used to remove oil stains from the blank.

[0009] In one embodiment, an acid pickling solution is used to remove oil stains from the blank.

[0010] In one embodiment, the heating furnace in the first heating step is an oxygen-free heating furnace.

[0011] In one embodiment, a first annealing step is included before the first pre-form blank shaping step: the first pre-form blank is subjected to a first annealing treatment under a protective gas.

[0012] In one embodiment, a second annealing step is included before the fourth preform grinding step: the fourth preform is subjected to a second annealing treatment under a protective gas.

[0013] In one embodiment, during the first hot stamping step, a ceramic thermal barrier coating is applied to the cavity of the stamping die.

[0014] In one embodiment, during the second hot stamping step, a ceramic thermal barrier coating is applied to the cavity of the stamping die.

[0015] The blank cleaning process removes dust, impurities, and oil from the blank. The cleaned blank is then heated to an austenitic state in a first heating step. A first hot stamping step then hot-stamps the heated blank to obtain a first pre-formed blank. A shaping step then reshapes and cuts the first pre-formed blank to obtain a second pre-formed blank. A second pre-formed blank treatment step then uniformly thermally sprays a hot stamping coating onto the second pre-formed blank to obtain a third pre-formed blank. A second heating step then heats the third pre-formed blank to an austenitic state. A second hot stamping step then hot-stamps the heated third pre-formed blank to obtain a fourth pre-formed blank. Finally, a polishing step then refines and polishes the fourth pre-formed blank to obtain a precision mold. The above precision mold hot stamping process is concise, sophisticated, and easy to control, with each step requiring meticulous attention. The mold obtained using this precision mold hot stamping process exhibits high precision, excellent corrosion resistance, and high structural strength. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the hot stamping process for precision molds in one embodiment. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Please see Figure 1 This invention provides a precision mold hot stamping process, the process comprising the following steps: Step 101: Raw material cleaning step: Clean off the dust, impurities and oil stains on the raw material.

[0023] Specifically, in this embodiment, a high-pressure water gun is used to remove dust and impurities from the blank. An oil remover is used to remove oil stains from the blank. An acid pickling solution is used to remove oil stains from the blank.

[0024] Step 102: First heating step: Place the cleaned billet into the heating furnace and heat it to the austenitic state.

[0025] In this embodiment, the heating furnace is an oxygen-free heating furnace.

[0026] Specifically, the cleaned billet is placed in an oxygen-free heating furnace and heated to the austenitic state. During the heating process, the oxygen-free heating furnace heats the billet at a rate of 2 to 4 degrees Celsius per second. The oxygen-free heating furnace avoids generating large amounts of oxide impurities during the heating process.

[0027] Step 103: First hot stamping step: The first heated blank is subjected to the first hot stamping to obtain the first pre-formed blank.

[0028] Specifically, a ceramic thermal barrier coating is applied to the cavity of the stamping die to protect it. Then, the preform after the first heating is subjected to a first hot stamping to obtain the first preform.

[0029] Step 104: First pre-form blank shaping step: The first pre-form blank is shaped and cut to obtain the second pre-form blank.

[0030] Specifically, the first pre-formed blank is an intermediate product, and there will be excess scraps on it. The excess scraps on the first pre-formed blank are then trimmed and cut to obtain the second pre-formed blank.

[0031] Step 105: Second preform processing step: Hot stamping coating is uniformly sprayed onto the second preform to obtain the third preform.

[0032] Specifically, a third preform is obtained by uniformly thermally spraying a hot-pressing coating onto the second preform to improve the protective performance of the second preform.

[0033] Step 106: Second heating step: Place the third pre-formed blank into the heating furnace and heat it to the austenitic state.

[0034] In this embodiment, the heating furnace is an oxygen-free heating furnace.

[0035] Specifically, the third pre-formed billet is placed in a heating furnace and heated to the austenitic state. During the heating process, the oxygen-free heating furnace heats up at a rate of 2 to 4 degrees Celsius per second. The oxygen-free heating furnace avoids generating large amounts of oxide impurities during the heating of the billet.

[0036] Step 107: Second hot stamping step: The third pre-formed blank after the second heating is subjected to a second hot stamping to obtain the fourth pre-formed blank.

[0037] Specifically, a ceramic thermal barrier coating is applied to the cavity of the stamping die to protect it. The third pre-formed blank, after being heated a second time, is then hot-stamped to obtain the fourth pre-formed blank.

[0038] Step 108: Fourth Preparatory Blank Grinding Step: Trim, grind and polish the fourth preparatory blank to obtain a precision mold.

[0039] Specifically, the fourth pre-formed blank will have burrs. The fourth pre-formed blank will be trimmed, ground and polished to obtain a precision mold.

[0040] To ensure the quality of the precision mold, in one embodiment, during the second pre-form material processing step, the hot stamping coating comprises the following components in parts by weight: 8 to 16 parts aluminum powder, 10 to 20 parts zinc-iron alloy powder, 8 to 14 parts magnesium oxide, 9 to 15 parts vermiculite powder, 7 to 16 parts silica powder, and 20 to 50 parts phenolic resin. This hot stamping coating protects the surface of the second pre-form material from excessive oxide impurities during hot pressing. It also prevents pitting on the surface, increasing its smoothness. Furthermore, the hot stamping coating provides lubrication, reducing the deformation resistance of the pre-form material and facilitating demolding.

[0041] To relieve stress in the first pre-formed billet and increase its toughness and structural strength, in one embodiment, a first annealing step is included before the shaping step: the first pre-formed billet is subjected to a first annealing treatment under a protective gas. In the first annealing treatment, the first pre-formed billet is heated to 710°C to 800°C at a heating rate of 2°C / s to 5°C / s under a protective gas and held for 4 to 6 minutes. Then, it is cooled to 300°C to 350°C at a cooling rate of 4°C / s to 8°C / s and held for 5 to 10 minutes. Finally, it is cooled to room temperature at a cooling rate of 4°C / s to 8°C / s. This effectively relieves stress in the first pre-formed billet and increases its toughness and structural strength.

[0042] To relieve stress in the fourth preform and increase the toughness and structural strength of the first preform, in one embodiment, a second annealing step is included before the grinding step of the fourth preform: the fourth preform is subjected to a second annealing treatment under a protective gas. In the second annealing treatment, the first preform is heated to 760°C to 850°C under a protective gas at a heating rate of 3°C / s to 6°C / s and held for 3 to 5 minutes. Then, it is cooled to 320°C to 360°C at a cooling rate of 5°C / s to 10°C / s and held for 8 to 12 minutes. Finally, it is cooled to room temperature at a cooling rate of 3°C / s to 6°C / s. This relieves stress in the fourth preform and increases the toughness and structural strength of the first preform.

[0043] The blank cleaning process removes dust, impurities, and oil from the blank. The cleaned blank is then heated to an austenitic state in a first heating step. A first hot stamping step then hot-stamps the heated blank to obtain a first pre-formed blank. A shaping step then reshapes and cuts the first pre-formed blank to obtain a second pre-formed blank. A second pre-formed blank treatment step then uniformly thermally sprays a hot stamping coating onto the second pre-formed blank to obtain a third pre-formed blank. A second heating step then heats the third pre-formed blank to an austenitic state. A second hot stamping step then hot-stamps the heated third pre-formed blank to obtain a fourth pre-formed blank. Finally, a polishing step then refines and polishes the fourth pre-formed blank to obtain a precision mold. The above precision mold hot stamping process is concise, sophisticated, and easy to control, with each step requiring meticulous attention. The mold obtained using this precision mold hot stamping process exhibits high precision, excellent corrosion resistance, and high structural strength.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A precision mold hot stamping process, characterized in that, The process includes the following steps: Raw material cleaning steps: Remove dust, impurities, and oil stains from the raw material; First heating step: Place the cleaned billet into the heating furnace and heat it to the austenitic state; First hot stamping step: The preform after the first heating is subjected to the first hot stamping to obtain the first preform; First pre-form blank shaping step: The first pre-form blank is shaped and cut to obtain the second pre-form blank; Second preform processing step: Hot stamping coating is uniformly sprayed onto the second preform to obtain the third preform; Second heating step: Place the third pre-formed blank into the heating furnace and heat it to the austenitic state; Second hot stamping step: The third pre-formed blank, after being heated for the second time, is subjected to a second hot stamping to obtain the fourth pre-formed blank; Fourth pre-form blank polishing step: Trim, polish and grind the fourth pre-form blank to obtain a precision mold.

2. The process according to claim 1, characterized in that, In the second pre-form material processing step, the hot stamping coating comprises the following components in parts by weight: 8 to 16 parts aluminum powder, 10 to 20 parts zinc-iron alloy powder, 8 to 14 parts magnesium oxide, 9 to 15 parts vermiculite powder, 7 to 16 parts silica powder, and 20 to 50 parts phenolic resin.

3. The process according to claim 1, characterized in that, High-pressure water guns are used to remove dust and impurities from the blanks.

4. The process according to claim 1, characterized in that, Use an oil remover to remove oil stains from the blank.

5. The process according to claim 1, characterized in that, Pickling solution is used to remove oil stains from the blank.

6. The process according to claim 1, characterized in that, In the first heating step, the heating furnace is an oxygen-free heating furnace.

7. The process according to claim 1, characterized in that, The process includes a first annealing step before the first pre-form blank shaping step: the first pre-form blank is subjected to a first annealing treatment under a protective gas.

8. The process according to claim 1, characterized in that, The process includes a second annealing step before the fourth pre-form blank grinding step: the fourth pre-form blank is subjected to a second annealing treatment under a protective gas.

9. The process according to claim 1, characterized in that, In the first hot stamping step, a ceramic thermal barrier coating is applied to the cavity of the stamping die.

10. The process according to claim 1, characterized in that, In the second hot stamping step, a ceramic thermal barrier coating is applied to the cavity of the stamping die.

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