L-shaped extrusion process

Abstract

The invention relates to the technical field of metal part extrusion, in particular to an L-shaped extrusion process, which solves the defects in the prior art, and comprises the following steps: S1, selecting a proper alloy material according to requirements, requiring no crack on the surface, and soaking and cleaning the material by using a pickling agent; s2, the material is heated, and the extrusion die is preheated; s3, extrusion parameters are set, the initial blank is extruded at the upper limit extrusion temperature, after 3-5 blanks are extruded, the temperature is lowered to the normal temperature, the materials are extruded, and a lubricating agent is added during extrusion; s4, after being extruded, the L-shaped product is subjected to air quenching through a fan and then directly exposed in air to be cooled; and S5, after the profile is stripped from the mold, a traction machine is adopted for traction, and artificial aging is conducted. The L-shaped material is extruded in a progressive manner, so that the excessive single-time overstock is avoided, the yield of products is improved, and meanwhile, the damage to the mold is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metal part extrusion, and in particular to an L-shaped extrusion process. Background Art

[0002] Profile extrusion refers to a profile processing method in which metal bars or plates are pressed into specific cross-sectional shapes by a metal extrusion machine. The extrusion method can not only process metal materials, but also process non-metal materials such as plastics.

[0003] In the extrusion process, the material utilization rate is high, the structure and mechanical properties of the material are improved, the operation is simple, the productivity is high, and long rods, deep holes, thin walls, and special-shaped cross-section parts can be manufactured. It is an important non-cutting or semi-cutting processing technology. Extrusion is mainly used for the forming of metals, and can also be used for the forming of non-metals such as plastics, rubbers, graphite, and clay blanks. In the current extrusion process, when extruding L-shaped products, due to the high hardness of the 6061 alloy material and the relatively thin wall thickness of the L-shaped product parts, during the extrusion process, the whole is prone to deformation or there will be cracks on its surface, seriously affecting the product quality, resulting in a low yield rate of the product, and it is easy to damage the extrusion die. Therefore, we propose an L-shaped extrusion process to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art and propose an L-shaped extrusion process.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An L-shaped extrusion process, the extrusion process includes the following steps:

[0007] S1. Select a suitable alloy material according to requirements, ensure that the surface has no cracks, and soak and clean the material with an acid pickling agent to remove surface stains;

[0008] S2. Heat the material, preheat the extrusion die, and keep it warm after heating;

[0009] S3. Set the extrusion parameters, extrude the initial blank at the upper limit extrusion temperature, and reduce the temperature to the normal temperature to extrude the material after extruding 3 to 5 blanks, and add a lubricant during extrusion;

[0010] S4. After the L-shaped product is extruded, it is air quenched by a fan and then directly exposed to the air for cooling;

[0011] S5. After the profile is removed from the die, it is pulled by a tractor and subjected to artificial aging, and then cut and packaged after artificial aging.

[0012] As a preferred technical solution of the present invention, in the step S1, the pickling agent is a 16-18% hydrochloric acid solution, and the soaking treatment time is 20 minutes to 40 minutes.

[0013] As a preferred technical solution of the present invention, the heating temperature of the material is 470°C to 490°C, the heating temperature of the extrusion die is 480°C to 500°C, and the temperature at the extrusion port is ensured to be 520°C to 525°C.

[0014] As a preferred technical solution of the present invention, the L-shaped forming cavity in the extrusion die is stepped, and the width of its extrusion port increases sequentially in the direction of the feeding port.

[0015] As a preferred technical solution of the present invention, the temperature of each section of the stepped forming cavity is 520°C to 525°C, 490°C to 500°C, and 480°C to 490°C in sequence from the extrusion port to the other side.

[0016] As a preferred technical solution of the present invention, the extrusion speed of the L-shaped material is 1 to 10 meters per minute, the traction force of the tractor is 200N to 250N, and the elongation rate is 0.6% to 0.8%.

[0017] As a preferred technical solution of the present invention, in the S4, air quenching adopts an online quenching and cooling method of strong wind plus water mist, and at the same time, the quenching temperature ≤ 100°C.

[0018] As a preferred technical solution of the present invention, the aging treatment requires uniform temperature, which is 200°C, the temperature difference does not exceed ±3°C to 5°C, and the aging insulation time is 1 hour to 2 hours.

[0019] The beneficial effects of the present invention are:

[0020] The L-shaped material is extruded in a progressive manner to avoid excessive single extrusion amount, and different heating temperatures are set in different extrusion sections to reduce the cracks on the surface of the material during extrusion, improve the yield rate of the product, and set different temperatures to facilitate the extrusion of the material from the die, while reducing the damage to the die. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the cross-section of the extrusion die in an L-shaped extrusion process proposed by the present invention. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Embodiment 1

[0024] Reference Figure 1 , an L-shaped extrusion process, the extrusion process comprising the following steps:

[0025] S1. Select a suitable alloy material according to requirements, requiring no cracks on the surface, and soak and clean the material with an acid pickling agent to remove surface stains;

[0026] S2. Heat the material, preheat the extrusion die, and keep it warm after heating;

[0027] S3. Set the extrusion parameters, extrude the initial blank at the upper limit extrusion temperature, and reduce the temperature to the normal temperature to extrude the material after extruding 3 blanks, and add a lubricant during extrusion. The lubricant is extreme pressure lubricating oil;

[0028] S4. After the L-shaped product is extruded, it is air quenched by a fan and then directly exposed to the air for cooling;

[0029] S5. After the profile is out of the die, it is pulled by a tractor and subjected to artificial aging, and then cut and packaged after artificial aging.

[0030] Further, in the step S1, the acid pickling agent is a 16% hydrochloric acid solution, and the soaking treatment time is 20 minutes.

[0031] Further, the heating temperature of the material is 470 °C, the heating temperature of the extrusion die is 480 °C, and the extrusion port temperature is ensured to be 520 °C.

[0032] Further, the L-shaped forming cavity in the extrusion die is stepped, and the width of its extrusion port increases sequentially in the direction of the feed port.

[0033] Further, the temperature of each section of the stepped forming cavity is 520 °C, 490 °C, and 480 °C in sequence from the extrusion port to the other side.

[0034] Further, the extrusion speed of the L-shaped material is 1 m / min, the traction force of the tractor is 200 N, and the elongation rate is 0.6%.

[0035] Further, in S4, the air quenching adopts an on-line quenching and strong wind plus water mist cooling method, and at the same time the quenching temperature ≤ 100 °C.

[0036] Further, the aging treatment requires uniform temperature, which is 200 °C, the temperature difference does not exceed ±3 - 5 °C, and the aging holding time is 1 hour.

[0037] Example two:

[0038] Reference Figure 1 , an L-shaped extrusion process, the extrusion process comprising the following steps:

[0039] S1. Select a suitable alloy material according to requirements, ensuring no cracks on the surface. Then soak and clean the material with an acid cleaning agent to remove surface stains.

[0040] S2. Heat the material and preheat the extrusion die, and then hold the temperature after heating.

[0041] S3. Set the extrusion parameters, extrude the initial blank at the upper limit extrusion temperature, and reduce the temperature to the normal temperature after extruding 3 to 5 blanks to extrude the material, and add a lubricant during extrusion. The lubricant is extreme pressure lubricating oil.

[0042] S4. After the L-shaped product is extruded, it is air quenched by a fan and then directly exposed to the air for cooling.

[0043] S5. After the profile exits the die, it is pulled by a tractor and then undergoes artificial aging. After artificial aging, it is cut and packaged.

[0044] Further, in step S1, the acid cleaning agent is a 17% hydrochloric acid solution, and the soaking treatment time is 30 minutes.

[0045] Further, the heating temperature of the material is 480 °C, the heating temperature of the extrusion die is 490 °C, and the extrusion port temperature is ensured to be 523 °C.

[0046] Further, the L-shaped forming cavity in the extrusion die is stepped, and the width of its extrusion port increases sequentially in the direction of the feed port.

[0047] Further, the temperature of each section of the stepped forming cavity is 523 °C, 495 °C, and 485 °C sequentially from the extrusion port to the other side.

[0048] Further, the extrusion speed of the L-shaped material is 5 m / min, the traction force of the tractor is 225 N, and the elongation rate is 0.7%.

[0049] Further, in S4, the air quenching adopts an online quenching and strong wind plus water mist cooling method, and at the same time, the quenching temperature ≤ 100 °C.

[0050] Further, the aging treatment requires uniform temperature, which is 200 °C, the temperature difference does not exceed ±3 - 5 °C, and the aging holding time is 1.5 hours.

[0051] Example 3:

[0052] Refer to Figure 1 , an L-shaped extrusion process, the extrusion process includes the following steps:

[0053] S1. Select a suitable alloy material according to requirements, ensuring no cracks on the surface. Then soak and clean the material with an acid cleaning agent to remove surface stains.

[0054] S2. Heat the material, preheat the extrusion die, and keep it warm after heating.

[0055] S3. Set the extrusion parameters, extrude the initial blank at the upper limit extrusion temperature, and reduce to the normal temperature to extrude the material after extruding 3 to 5 blanks, and add a lubricant during extrusion. The lubricant is extreme pressure lubricating oil.

[0056] S4. After the L-shaped product is extruded, it is air quenched by a fan and then directly exposed to the air for cooling.

[0057] S5. After the profile exits the die, it is pulled by a tractor and subjected to artificial aging. After artificial aging, it is cut and packaged.

[0058] Further, in step S1, the pickling agent is 18% hydrochloric acid solution, and the soaking treatment time is 40 minutes.

[0059] Further, the heating temperature of the material is 490 °C, the heating temperature of the extrusion die is 500 °C, and the extrusion port temperature is ensured to be 525 °C.

[0060] Further, the L-shaped forming cavity in the extrusion die is stepped, and the width of its extrusion port increases successively in the direction of the feed port.

[0061] Further, the temperature of each section of the stepped forming cavity is 525 °C, 500 °C, and 490 °C successively from the extrusion port to the other side.

[0062] Further, the extrusion speed of the L-shaped material is 10 m / min, the traction force of the tractor is 250 N, and the elongation rate is 0.8%.

[0063] Further, in S4, the air quenching adopts an online quenching and strong wind plus water mist cooling method, and at the same time, the quenching temperature ≤ 100 °C.

[0064] Further, the aging treatment requires uniform temperature, which is 200 °C, the temperature difference does not exceed ±3 - 5 °C, and the aging holding time is 2 hours.

[0065] In this embodiment: A progressive forming cavity is set in the extrusion die, and the L-shaped material is extruded in a progressive manner to avoid excessive single extrusion volume. Different heating temperatures are set in different extrusion sections to reduce the cracks on the surface of the material during extrusion, improve the yield rate of the product, and set different temperatures to facilitate the extrusion of the material from the die, while reducing the damage to the die.

[0066] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An L-shaped extrusion process, characterized in that, The extrusion process includes the following steps: S1. Select a suitable alloy material according to requirements, ensure that the surface has no cracks, and soak and clean the material with an acid pickling agent to remove surface stains; S2. Heat the material, preheat the extrusion die, and keep it warm after heating; S3. Set the extrusion parameters, extrude the initial blank at the upper limit extrusion temperature, reduce to the normal temperature after extruding 3 to 5 blanks and then extrude the material, and add a lubricant during extrusion; S4. After the L-shaped product is extruded, it is air quenched by a fan and then directly exposed to the air for cooling; S5. After the profile is out of the die, it is pulled by a tractor and subjected to artificial aging. After artificial aging, it is cut and packaged.

2. The L-shaped extrusion process according to claim 1, characterized in that, In step S1, the acid pickling agent is a 16-18% hydrochloric acid solution, and the soaking treatment time is 20 minutes to 40 minutes.

3. The L-shaped extrusion process according to claim 1, characterized in that, The heating temperature of the material is 470°C to 490°C, the heating temperature of the extrusion die is 480°C to 500°C, and ensure that the extrusion port temperature is 520°C to 525°C.

4. The L-shaped extrusion process according to claim 1, characterized in that, The L-shaped forming cavity in the extrusion die is stepped, and the width of its extrusion port increases sequentially in the direction of the feed port.

5. The L-shaped extrusion process according to claim 4, characterized in that, The temperature of each section of the above stepped forming cavity is 520°C to 525°C, 490°C to 500°C, and 480°C to 490°C in sequence from the extrusion port to the other side.

6. The L-shaped extrusion process according to claim 1, characterized in that, The extrusion speed of the L-shaped material is 1 to 10 m / min, the traction force of the tractor is 200 N to 250 N, and the elongation rate is 0.6% to 0.8%.

7. The L-shaped extrusion process according to claim 1, characterized in that In S4, the air quenching adopts an online quenching and strong wind plus water mist cooling method, and at the same time the quenching temperature ≤ 100°C.

8. The L-shaped extrusion process according to claim 1, characterized in that, The aging treatment requires uniform temperature, which is 200°C, the temperature difference does not exceed ±3°C to 5°C, and the aging holding time is 1 hour to 2 hours.

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