Process method for manufacturing glass mat for hot extrusion of high alloy steel

Abstract

The invention relates to the technical field of hot extrusion, in particular to a process method for manufacturing a glass pad for hot extrusion of high alloy steel. The invention provides a process method for manufacturing a glass mat for hot extrusion of high alloy steel, which comprises the following steps of: mixing proper glass powder and water glass raw materials to obtain a mixture for manufacturing the glass mat, adding hemp ropes with the diameter of phi 2 into a mold when 1 / 3 and 2 / 3 of the mixture are poured into the mold, and arranging the hemp ropes into a 50 * 50 net shape; three circles of hemp ropes with the diameter phi of 5 are uniformly distributed in the circumferential direction and are heated and insulated by a heating furnace after being completely poured into the glass mat, so that the glass mat with a good lubricating effect is prepared, and the defects of pits, folding, cracks, cross grains and the like on the surface of a product due to the lubricating reason of the glass mat in the extrusion process are eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of hot extrusion, and particularly relates to a process method for manufacturing a glass pad for hot extrusion of high-alloy steel. Background Art

[0002] Extrusion is a plastic forming method in which an external force is applied to a metal ingot blank placed in a container (extrusion cylinder) from one end, forcing it to flow out through a specific die hole to obtain a product with the required cross-sectional shape and size. The hot extrusion of high-alloy steel is carried out under high temperature and high pressure, and a suitable lubricant must be used to reduce the friction force, which is a prerequisite for realizing extrusion deformation and affects the surface quality of the product.

[0003] Currently, the lubricant used for hot extrusion of high-alloy steel is glass powder. After mixing the glass powder with a binder, a glass pad is made and placed between the metal blank and the extrusion die. During the extrusion process, when the metal passes through the extrusion die, the glass pad softens and adheres to the metal surface to play a lubricating role. The composition of the glass pad is configured according to actual needs, and the viscosity of the glass pad is different at different extrusion temperatures. If the configuration of the glass pad is not suitable, defects such as pits, folds, cracks, and cross stripes will occur on the surface of the high-alloy steel product after extrusion, affecting the quality of the product and the material utilization rate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a process method for manufacturing a glass pad for hot extrusion of high-alloy steel in view of the above-mentioned deficiencies of the prior art, solve the problem of poor lubrication effect of the glass pad in the hot extrusion of high-alloy steel, and eliminate defects such as pits, folds, cracks, and cross stripes on the product surface caused by the lubrication of the glass pad during the extrusion process.

[0005] The present invention provides a process method for manufacturing a glass pad for hot extrusion of high-alloy steel, including the following steps:

[0006] S1. Clean, wipe, and dry the glass pad shaping mold;

[0007] S2. Add water glass to the glass powder and stir evenly to obtain a mixture;

[0008] S3. After assembling all components of the complete glass pad shaping mold, add the mixture prepared in S2 to the mold cavity. First, add 1 / 3 of the volume of the mold cavity, smooth and compact it, and put in hemp rope one to form a network distribution. Then put in hemp rope two evenly distributed in the circumferential direction. After that, continue to add the mixture prepared in S2 until it reaches 2 / 3 of the volume of the mold cavity. Smooth and compact it, and then put in hemp rope one again to form a network distribution. At the same time, put in hemp rope two evenly distributed in the circumferential direction. Finally, add the mixture prepared in S2 again to fill the mold cavity and smooth and compact it to meet the height requirement of the glass pad. Then demold the glass pad onto the backing plate.

[0009] S4. Place the demolded glass pad into a heating furnace for heating and heat preservation to obtain the completed glass pad.

[0010] According to the process method for manufacturing a glass pad for hot extrusion of high alloy steel provided by the present invention, the addition ratio of the water glass described in S2 is 8% - 13%.

[0011] According to the process method for manufacturing a glass pad for hot extrusion of high alloy steel provided by the present invention, the number of glass powder particles with particle sizes between 20 and 100 meshes in the glass powder is ≥70%, the softening point temperature of the glass powder is 750 - 850 °C, the glass powder is composed of SiO 2 , Al 2 O 3 , CaO, MgO, Fe 2 O 3 and TiO 2 and has a viscosity of 50 - 100 poises at a temperature of 1200 - 1260 °C.

[0012] According to the process method for manufacturing a glass pad for hot extrusion of high alloy steel provided by the present invention, the content of sodium silicate in the water glass described in S2 is 16% - 18%.

[0013] According to the process method for manufacturing a glass pad for hot extrusion of high alloy steel provided by the present invention, the diameter of the first hemp rope in S3 is Ф2, the specification of the mesh distribution is 50×50, the diameter of the second hemp rope is Ф5, and a total of three circles are evenly distributed in the circumferential direction.

[0014] According to the process method for manufacturing a glass pad for hot extrusion of high alloy steel provided by the present invention, the temperature of the heating furnace in S4 is 110 - 130 °C, and the heat preservation time of the heating furnace is 8 - 10 h.

[0015] The present invention has the following advantages compared with the prior art:

[0016] The present invention provides a process method for manufacturing a glass pad for hot extrusion of high alloy steel. By mixing appropriate glass powder and water glass raw materials to obtain a mixture for manufacturing the glass pad, when pouring the mixture into the mold, when pouring 1 / 3 and 2 / 3, a hemp rope with a diameter of Ф2 is added to form a 50×50 mesh, and a hemp rope with a diameter of Ф5 is evenly distributed in the circumferential direction for a total of three circles. After all is poured, it is heated and heat-preserved in a heating furnace to prepare a glass pad with good lubrication effect, eliminating defects such as pits, folds, cracks, and cross stripes on the product surface caused by the lubrication of the glass pad during the extrusion process. Specific Embodiments

[0017] Example 1

[0018] This embodiment provides a process method for manufacturing a glass pad for hot extrusion of high-alloy steel. The specific steps are as follows:

[0019] S1. Clean, wipe, and dry the glass pad shaping mold. Open the heating furnace and set the temperature to 120°C for preheating.

[0020] S2. Add sodium silicate to the glass powder. The addition ratio of sodium silicate varies according to the outer diameter of the glass pad, and the addition ratio of sodium silicate is between 8% and 13%. Stir the glass powder and sodium silicate evenly to obtain a wet and loose mixture.

[0021] Among them, in this embodiment, the content of sodium silicate in the sodium silicate is selected to be 16%.

[0022] In this embodiment, the glass powder is selected as light blue or yellowish-white glass particles. The number of glass powder particles with a particle size between 20 and 100 meshes is not less than 70%. The softening point (i.e., the 75% point) temperature of the glass powder is 750°C, which is composed of chemical substances SiO 2 、Al 2 O 3 、CaO、MgO、Fe 2 O 3 and TiO 2 The viscosity of this glass powder at a high temperature of 1200°C is 50 poises.

[0023] S3. After assembling all components of the complete glass pad shaping mold, add the mixture prepared in S2 into the mold cavity. First, add 1 / 3 of the volume of the mold cavity, smooth and compact it, and put in a hemp rope with a diameter of Ф2 to form a 50×50 mesh distribution. Then put in a hemp rope with a diameter of Ф5 and evenly distribute it in 3 circles in the circumferential direction. After that, continue to add the mixture prepared in S2 until it reaches 2 / 3 of the volume of the mold cavity. Smooth and compact it, and then put in a hemp rope with a diameter of Ф2 again to form a 50×50 mesh distribution, and put in a hemp rope with a diameter of Ф5 and evenly distribute it in 3 circles in the circumferential direction. Finally, add the mixture prepared in S2 again to fill the mold cavity and smooth and compact it to meet the height requirement of the glass pad. Then demold the glass pad onto the backing plate to prevent the glass pad from breaking.

[0024] S4. Place the demolded glass pad into the heating furnace, adjust the temperature of the heating furnace to be maintained within the range of 110°C and keep it warm for 10h.

[0025] S5. Mark the manufactured glass pad. The marking content includes the glass powder model, specification, and manufacturing time.

[0026] Using the method for preparing the glass pad provided in this embodiment, defects such as pits, folds, cracks, and horizontal stripes on the product surface caused by glass pad lubrication during the extrusion process can be eliminated, and the lubrication effect of the glass pad in the extrusion of high alloy steel is improved.

[0027] Example 2

[0028] This embodiment provides a process method for manufacturing a glass pad for hot extrusion of high alloy steel. The specific steps are as follows:

[0029] S1. Clean, wipe, and dry the glass pad shaping mold. Open the heating furnace and set the temperature to 120 °C for preheating.

[0030] S2. Add sodium silicate to the glass powder. The addition ratio of sodium silicate changes according to the outer diameter of the glass pad. The addition ratio of sodium silicate is between 8% and 13%. Stir the glass powder and sodium silicate evenly to obtain a wet and loose mixture.

[0031] Among them, in this embodiment, the content of sodium silicate in the sodium silicate is selected to be 18%.

[0032] In this embodiment, the glass powder is selected as light blue or yellowish-white glass particles. The particle size of not less than 70% of the glass powder is between 20 and 100 mesh. The softening point (i.e., 75% point) temperature of the glass powder is 850 °C. The glass powder is composed of chemical substances SiO 2 、Al 2 O 3 、CaO, MgO, Fe 2 O 3 and TiO 2 The viscosity of the glass powder at a high temperature of 1260 °C is 100 poises.

[0033] S3. After combining all components of the complete glass pad shaping mold, add the mixture prepared in S2 into the mold cavity. First, add 1 / 3 of the volume of the mold cavity, smooth and compact it, and put in a hemp rope with a diameter of Ф2 to form a 50×50 mesh distribution. Then put in a hemp rope with a diameter of Ф5 and evenly distribute 3 circles in the circumferential direction. After that, continue to add the mixture prepared in S2 until it reaches 2 / 3 of the volume of the mold cavity. Smooth and compact it, and then put in a hemp rope with a diameter of Ф2 again to form a 50×50 mesh distribution, and put in a hemp rope with a diameter of Ф5 and evenly distribute 3 circles in the circumferential direction. Finally, add the mixture prepared in S2 again to fill the mold cavity and smooth and compact it to meet the height requirement of the glass pad. Then demold the glass pad onto the backing plate.

[0034] S4. Place the demolded glass pad into the heating furnace, adjust the temperature of the heating furnace to be maintained within the range of 130 °C and keep it warm for 8 h.

[0035] S5. Mark the completed glass pad, and the marking content includes the glass powder model, specification, and production time.

[0036] Example 3

[0037] This example provides a process method for manufacturing a glass pad for hot extrusion of high alloy steel. The specific steps are as follows:

[0038] S1. Clean, wipe, and dry the glass pad shaping mold. Open the heating furnace and set the temperature to 120 °C for preheating.

[0039] S2. Add water glass to the glass powder. The addition ratio of water glass varies according to the outer diameter of the glass pad, and the addition ratio of water glass is between 8% and 13%. Stir the glass powder and water glass evenly to obtain a wet and loose mixture.

[0040] Among them, in this example, the content of sodium silicate in the water glass is selected to be 17%.

[0041] In this example, the glass powder is selected as light blue or yellowish-white glass particles. The number of glass powder particles with a particle size between 20 and 100 meshes is not less than 70%. The softening point (i.e., 75% point) temperature of the glass powder is 800 °C, and it is composed of chemical substances SiO 2 , Al 2 O 3 , CaO, MgO, Fe 2 O 3 and TiO 2 . The viscosity of this glass powder at a high temperature of 1230 °C is 75 poises.

[0042] S3. After assembling all components of the complete glass pad shaping mold, add the mixture prepared in S2 into the mold cavity. First, add 1 / 3 of the volume of the mold cavity, smooth and compact it, and put in a hemp rope with a diameter of Ф2 to form a 50×50 mesh distribution. Then put in a hemp rope with a diameter of Ф5 and evenly distribute it in 3 circles in the circumferential direction. After that, continue to add the mixture prepared in S2 until it reaches 2 / 3 of the volume of the mold cavity. Smooth and compact it, and then put in a hemp rope with a diameter of Ф2 again to form a 50×50 mesh distribution, and put in a hemp rope with a diameter of Ф5 and evenly distribute it in 3 circles in the circumferential direction. Finally, add the mixture prepared in S2 again to fill the mold cavity and smooth and compact it to meet the height requirement of the glass pad. Then demold the glass pad onto the backing plate.

[0043] S4. Place the demolded glass pad into the heating furnace, adjust the temperature of the heating furnace to be maintained within the range of 120 °C and keep it warm for 9 h.

[0044] S5. Mark the completed glass pad, and the marking content includes the glass powder model, specification, and production time.

[0045] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent variations made to the above embodiments based on the technical essence of the invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A process for making a glass mat for hot extrusion of high alloy steel, characterized in that: The following steps are involved: S1. Clean, wipe and dry the glass pad molding mold; S2, adding water glass to the glass powder, stirring evenly to obtain a mixture; S3, after assembling all the components of the complete glass mat molding mold, add the mixture prepared in S2 into the mold cavity, first add 1 / 3 of the mold cavity volume, smooth and compact it, put hemp rope 1 to form a network distribution, then put hemp rope 2 evenly distributed in the circumferential direction, and then continue to add the mixture prepared in S2, add it to 2 / 3 of the mold cavity volume, smooth and compact it, put hemp rope 1 again to form a network distribution, and put hemp rope 2 evenly distributed in the circumferential direction at the same time, and finally add the mixture prepared in S2 again, fill the mold cavity and smooth and compact it to meet the height requirement of the glass mat, and then demold the glass mat onto the pad; S4, placing the demoulding glass mat in a heating furnace for heating and heat preservation to obtain a finished glass mat.

2. The process for making a glass mat for hot extrusion of high alloy steel according to claim 1, characterized in that: The addition ratio of water glass in S2 is 8% to 13%.

3. The process for making a glass mat for hot extrusion of high alloy steel according to claim 1, characterized in that: The number of particles of the glass powder in S2 that are between 20 and 100 mesh is ≥ 70%, the softening point of the glass powder is 750 to 850°C, the glass powder is composed of SiO2, Al2O3, CaO, MgO, Fe2O3 and TiO2, and the viscosity of the glass powder at a temperature of 1200 to 1260°C is 50 to 100 poise.

4. The process for making a glass mat for hot extrusion of high alloy steel according to claim 1, characterized in that: The content of sodium silicate in the water glass described in S2 is 16-18%.

5. The process for making a glass mat for hot extrusion of high alloy steel according to claim 1, characterized in that: The diameter of the hemp rope 1 in S3 is Φ2, the specification of the mesh distribution is 50×50, the diameter of the hemp rope 2 is Φ5, and the circumferential direction is evenly distributed with a total of three circles.

6. The process for making a glass mat for hot extrusion of high alloy steel according to claim 1, characterized in that: The temperature of the heating furnace in S4 is 110-130° C., and the insulation time of the heating furnace is 8-10 hours.