CN116000192A - Application method of upper die quick clamping device - Google Patents
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- CN116000192A CN116000192A CN202211678593.8A CN202211678593A CN116000192A CN 116000192 A CN116000192 A CN 116000192A CN 202211678593 A CN202211678593 A CN 202211678593A CN 116000192 A CN116000192 A CN 116000192A
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Abstract
The invention discloses a use method of an upper die quick clamping device, which comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.17 to 0.52 part of C, 0.17 to 0.31 part of Si, 5.44 to 8.15 parts of Mn, 7.13 to 11.58 parts of Cr, 4.15 to 6.55 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.021 to 0.038 part of Nb, 0.012 to 0.017 part of Y, 0.07 to 0.23 part of Ti, 0.08 to 0.14 part of B, and the balance of Fe and impurities. The toughness of the alloy material and the technological performance, the wear resistance and the densification distribution of crystal grains of the forging are improved.
Description
Technical Field
The invention relates to the technical field of bending dies, in particular to a use method of an upper die quick clamping device.
Background
The existing production mode adopts a common bending machine, an upper die is arranged on a sliding block of the bending machine, a lower die is fixed on a workbench of the bending machine, and the upper die and the lower die are required to be used in a complete set. The bending machine can process the workpieces with different size requirements by changing the dies with different shapes and specifications, the shape and the size of the general die can only process one workpiece with one shape and size once being fixed, and in the actual work, a plurality of workpieces have small size change, so that the die is changed to waste the production time, and the production of the die is greatly invested; the large-scale production difficulty is big, and the precision is not good control, and current work efficiency of processing a work piece once is low.
According to the preparation method of the high-performance hot-work die steel, on the basis of the H13 steel component, the component design thought of low C, low Si and high Mo and composite Ni micro-alloying is adopted to optimize the alloy component, the mass percentage of chemical components is 0.34-0.39% C, 0.35-0.55% Mn, 0.20-0.35% Si, less than or equal to 0.001% S, less than or equal to 0.008% P, 4.90-5.10% Cr, 2.3-2.6% Mo, 0.50-0.70% V, 0.25-0.35% Ni, less than or equal to 0.08% Cu and the balance Fe, and meanwhile, the production process is strictly controlled according to the following specific process route: meanwhile, the production process comprises electric furnace smelting, ladle refining, vacuum refining, inert gas protection electrode blank casting, constant melting speed electroslag furnace remelting in protective atmosphere, high-temperature homogenization treatment, multidirectional forging, pretreatment after forging and superfine treatment. The invention also relates to a high-performance hot working die steel, the product has uniform microstructure in an annealed state, good spheroidized structure and fine and uniform grain distribution, uniform quenching and tempering structure, and the fine precipitated phases of Mo, cr and V carbides play a role in dispersion strengthening in the use process, and meanwhile, a proper amount of Ni element can increase hardenability, refine grains and play a role in increasing the toughness and fatigue resistance of the steel.
But neglects the problem that the module needs to be correspondingly disassembled and assembled according to the change of the type and the size of the workpiece, if the scheme is adopted, the module needs to be ensured to have certain wear resistance. Secondly, the process needs to adopt ultrahigh-temperature long-time high-temperature diffusion, so that easily oxidized metal elements can be oxidized to generate oxides, the oxides contain a large number of micropores and cracks to increase the unreliability of the performance of the die steel, the structure is loose, the performance continuity of the die steel material is damaged, and particularly the process performance of a forging piece is easily influenced during forging, so that an upper die rapid clamping device capable of being molded for tens of thousands of times and a use method thereof are needed.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a quick clamping device for an upper die and a using method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the quick clamping device for the upper die comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.17 to 0.52 part of C, 0.17 to 0.31 part of Si, 5.44 to 8.15 parts of Mn, 7.13 to 11.58 parts of Cr, 4.15 to 6.55 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.021 to 0.038 part of Nb, 0.012 to 0.017 part of Y, 0.07 to 0.23 part of Ti, 0.08 to 0.14 part of B, and the balance of Fe and impurities;
wherein: ti=0.21 (nb+y) +0.34 (c+s);
wherein: si=0.21b+0.015 (ni+cr).
By adopting the scheme: by reasonably quantifying the solid solution strengthening effect of Si, which is melted in an alloy matrix, B is used for forming a hard metal compound with Ni and/or Cr, so that dispersion distribution in the alloy plays a role in dispersion strengthening, and the hardness and wear resistance of the hard alloy can be improved. The addition of Cr can strengthen the solid solution strengthening effect and passivation capability of Ni, and can also form a hard intermetallic compound phase with B and Si, thereby playing a role of dispersion strengthening and improving the wear resistance. The B and Si are added, so that the overall solid-liquid phase temperature interval of the upper die body steel is wider, the upper die body steel has excellent fluidity and wettability, and the process performance of the upper die body steel is better; the molten steel forms salts with light density, low viscosity and good fluidity on the surface to float upwards, so that the alloy is protected from oxidation and the generation of air holes is prevented.
A reasonable amount of Ti (0.21 (Nb+Y) +0.34 (C+S)), when Ti forms TiC, nb and Y can make primary TiC dendrites become fine, dendrite spacing is increased, slender eutectic titanium carbide is increased to obtain superfine TiC, the superfine TiC is purified at an Nb-Y purification interface to increase interface wettability, so that the superfine TiC can be uniformly dispersed in an alloy matrix to have higher compactness, and when microcracks and residual stress are generated around the superfine TiC, pinning effect can be generated on the cracks, fracture energy is consumed, and therefore toughness of alloy materials and processing performance of forgings are improved. The precipitates TiN, tiC, ti (C, N) and the like in the steel can prevent austenite grains from growing in the heating and forging processes, inhibit the recovery and recrystallization of deformed austenite grains, and further promote the refinement of ferrite grains by the deformed zone and unreflected substructure boundary in the austenite, and play a role in refining the structure and the grains, so that the strength and the impact toughness of the steel are improved. The affinity of Ti and S is stronger than that of Mn and S, and the content of Ti increases with the increase of the content of Ti, ti in steel 4 C 2 S 2 The compounds gradually increase and replace MnS inclusions, i.e. the addition of Ti deprives S in MnS, with which more stable Ti is formed 4 C 2 S 2 Can reduce precipitation of MnS, and the strip-shaped MnS inclusion in the steel is caused by Ti 4 C 2 S 2 Is reduced by the formation of (a). Spherical Ti 4 C 2 S 2 The steel has high hardness, does not deform during high-temperature forging, and can improve the impact toughness of the steel.
Ti, Y and Al can also form binary or ternary eutectic liquid phase at relatively low temperature in the cooling process of molten steel, and the appearance of the liquid phase is favorable for the molten steel to flow to a certain extent when grains are initially formed in the forming process, so that the densification distribution of the grains is promoted.
In the above embodiment, the following improvements are made, and the upper die body comprises the following components in percentage by mass: 0.19 to 0.50 part of C, 0.21 to 0.28 part of Si, 5.87 to 7.65 parts of Mn, 8.15 to 9.54 parts of Cr, 4.65 to 6.15 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.025 to 0.037 part of Nb, 0.014 to 0.016 part of Y, 0.09 to 0.20 part of Ti, 0.08 to 0.14 part of B, and the balance of Fe and impurities.
In the embodiment, the upper die body also comprises 0.013 to 0.023 parts of alloy steel modifier which comprises 32 to 45 parts of Al 2 O 3 26-31 parts of Al and 16-28 parts of CaF 2 5 to 15 parts of MgO and 2 to 5 parts of LaNi 5 . When tapping, the ladle slag can be deoxidized and modified by adding the components, so that the desulfurization rate of molten steel is improved, and floating calcium carbide and aluminum particles are adopted to carry out diffusion deoxidization, so that the ladle slag is promoted to be melted rapidly and deoxidized uniformly. Mg with good thermal stability is easy to obtain 2 NiLa，Mg 2 Ni，MgNi 2 A three-phase alloy. Since Ti element has extremely active chemical properties and reacts with 0, N, etc. in molten steel easily, ti microalloying is selected before tapping of molten steel to stabilize the yield of Ti element.
The embodiment of the invention is characterized by further comprising an upper die holder, wherein the upper die holder is provided with a mounting notch for mounting the upper die body, the side wall of the mounting notch is provided with an adjusting groove, the interior of the adjusting groove is provided with a pressing structure for adjusting the state of the upper die body, the upper die holder is provided with a limiting groove, and the upper die body is provided with a limiting body matched with the limiting groove.
In the above embodiment, the pressing structure includes an adjusting member disposed in the adjusting groove, a material of the adjusting member is consistent with a material of the upper die body, a jackscrew is disposed on the upper die base, an end portion of the jackscrew extends to an inner wall of the adjusting groove and abuts against one side of the adjusting member opposite to the upper die body, a counter bore is further disposed on the upper die base, and a spring and a bolt penetrating through the spring and connected with the adjusting member are disposed in the counter bore.
In the above embodiment, the improvement is made that a positioning area recessed inward is arranged on the upper die body, and an outer convex pushing area adapted to the positioning area is arranged on one side of the adjusting piece opposite to the upper die body.
In the above embodiment, the following improvement is made, and the cross sections of the positioning area and the convex pushing area are arranged in a circular arc, cone or rectangular structure.
A processing method of an upper die quick clamping device comprises the following processing steps:
(1) Smelting
Smelting by adopting the material of claim 1, and adding 0.013-0.023 part of alloy steel modifier during tapping to prepare forging blanks of the upper die body and the adjusting piece material;
(2) Destressing annealing treatment for forging and forgings
Heating the obtained forging blank to 1250-1450 ℃ for forging, and obtaining a forging piece at a final forging temperature of 950-970 ℃; annealing the obtained forge piece through an annealing furnace, wherein the annealing temperature is 680-750 ℃, the annealing time is 4-5 h, cooling to 200-300 ℃ in the annealing furnace, preserving heat for 0.6-1.2 h, and then cooling to normal temperature;
(3) Preliminary working and heat treatment of forgings
Processing the forge piece into a primary shape of a die on a machine tool, wherein each surface keeps a margin of 1.5 mm; heating the die obtained by machining to 530-550 ℃ and then preserving heat for 3-4 hours, then heating to 750-800 ℃ and preserving heat for 1-2 hours, then heating to 940-960 ℃, preserving heat for 30-45 minutes and then quenching, oil quenching, cooling and then carrying out cryogenic treatment, wherein the temperature of the cryogenic treatment is-220 ℃ to-230 ℃, the temperature is maintained for 1-2 hours, the die is restored to normal temperature in air, primary tempering is carried out, the tempering temperature is 130-140 ℃, cooling is carried out to normal temperature and then placing for 1-1.5 hours, secondary tempering is carried out, and the tempering temperature is 150-170 ℃;
(4) Deep processing and processing center treatment of upper die body and adjusting piece
Removing an oxide layer on the surface of the treated die, assembling the die on a grinding machine, grinding, reserving a margin of 0.7-1 mm on each surface, and grinding the other surfaces except the cambered surface to the required size again after the die is placed for at least 1 day; and (3) putting the workpiece obtained by deep processing into a processing center, milling the cambered surface of the die by adopting a milling cutter, and removing the allowance of 0.7-1 mm.
The application method of the upper die quick clamping device comprises the following steps: firstly, the upper die body is horizontally and transversely installed through the limit body and the limit groove in an adaptation mode, after the upper die body is installed in place, the adjusting piece can be moved to one side close to the upper die body through adjusting a quarter circle to a half circle range through the jackscrew stroke, and then the jacking operation of the upper die body is completed, and in the process, the spring is further compressed;
when the press-fit state needs to be released for replacement, the jackscrew is reversely rotated and adjusted to enable the stroke to be adjusted within the range from one quarter circle to one half circle, the process is gradually restored due to the compression degree of the spring, the adjusting piece moves to one side far away from the upper die body, at the moment, the upper die body only needs to be horizontally and transversely removed from the inside of the mounting notch, a new upper die body is reinstalled, and the jackscrew is readjusted to press the upper die body through the adjusting piece.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the present invention at a counterbore;
FIG. 3 is a cross-sectional view of the present invention at the jackscrew;
FIG. 4 is a side view of an upper die holder of the present invention;
FIG. 5 is a front view of an upper mold body of the present invention;
fig. 6 is a schematic structural view of the adjusting member of the present invention.
In the figure: 10. an upper die holder; 20. an upper die body; 30. a mounting notch; 40. an adjustment groove; 50. a limit groove; 60. a limiting body; 70. a jackscrew; 80. an adjusting member; 90. a spring; 100. countersink; 110. positioning an area; 120. the convex pushing area; 130. and (5) a bolt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
The quick clamping device for the upper die comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.17 part of C, 0.186 part of Si, 5.44 parts of Mn, 7.13 parts of Cr, 4.15 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.021 part of Nb, 0.012 part of Y, 0.072 part of Ti, 0.08 part of B, and the balance of Fe and impurities;
wherein: ti=0.21 (nb+y) +0.34 (c+s) =0.21 (0.021+0.012) +0.34 (0.17+0.02) =0.072;
wherein: si=0.21×b+0.015× (ni+cr) =0.21×0.08+0.015×
(4.15+7.13)＝0.186。
Example 2
The quick clamping device for the upper die comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.19 part of C, 0.22 part of Si, 5.87 parts of Mn, 8.15 parts of Cr, 5.15 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.028 part of Nb, 0.016 part of Y, 0.081 part of Ti, 0.08 part of B, and the balance of Fe and impurities;
wherein: ti=0.21 (nb+y) +0.34 (c+s) =0.21 (0.028+0.016) +0.34 (0.19+0.02) =0.081;
wherein: si=0.21×b+0.015× (ni+cr) =0.21×0.08+0.015×
(5.15+8.15)＝0.22。
Example 3
The quick clamping device for the upper die comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.32 part of C, 0.265 part of Si, 7.65 parts of Mn, 9.54 parts of Cr, 6.15 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.037 part of Nb, 0.016 part of Y, 0.127 part of Ti, 0.14 part of B, and the balance of Fe and impurities;
wherein: ti=0.21 (nb+y) +0.34 (c+s) =0.21 (0.037+0.016) +0.34 (0.32+0.02) =0.127;
wherein: si=0.21×b+0.015× (ni+cr) =0.21×0.14+0.015×
(6.15+9.54)＝0.265。
The hardness of the die manufactured by the three embodiments in the same process is HRC59, HRC61 and HRC58 respectively, and the die has no crack after magnetic powder inspection. After 18700 times, 19100 times and 18500 times of processing, the upper die is still normally used.
By adopting the scheme: by reasonably quantifying the solid solution strengthening effect of Si, which is melted in an alloy matrix, B is used for forming a hard metal compound with Ni and/or Cr, so that dispersion distribution in the alloy plays a role in dispersion strengthening, and the hardness and wear resistance of the hard alloy can be improved. The addition of Cr can strengthen the solid solution strengthening effect and passivation capability of Ni, and can also form a hard intermetallic compound phase with B and Si, thereby playing a role of dispersion strengthening and improving the wear resistance. The B and Si are added, so that the overall solid-liquid phase temperature interval of the upper die body steel is wider, the upper die body steel has excellent fluidity and wettability, and the process performance of the upper die body steel is better; the molten steel can form salts with light density, low viscosity and good fluidity on the surface to float upwards, so that the welding layer alloy is protected from oxidation and the generation of air holes is prevented.
A reasonable amount of Ti (0.21 (Nb+Y) +0.34 (C+S)), when Ti forms TiC, nb and Y can make primary TiC dendrites become fine, dendrite spacing is increased, slender eutectic titanium carbide is increased to obtain superfine TiC, the superfine TiC is increased in interface wettability at a Nb and Y purification interface, so that the superfine TiC can be uniformly dispersed in an alloy matrix to have higher compactness, and when microcracks and residual stress are generated around the superfine TiC, pinning effect can be generated on the cracks, fracture energy is consumed, and toughness of an alloy material is improved. The precipitates TiN, tiC and Ti (C, N) and the like in the steel can prevent the austenite grains from growing in the heating and forging processes, and inhibit the recovery and recrystallization of deformed austenite grains, while the deformed bands and unreflected austenite grainsThe substructure boundary of the steel can further promote refinement of ferrite grains, and can play a role in refining tissues and grains, thereby improving the strength and impact toughness of the steel. The affinity of Ti and S is stronger than that of Mn and S, and the content of Ti increases with the increase of the content of Ti, ti in steel 4 C 2 S 2 The compounds gradually increase and replace MnS inclusions, i.e. the addition of Ti deprives S in MnS, with which more stable Ti is formed 4 C 2 S 2 Can reduce precipitation of MnS, and the strip-shaped MnS inclusion in the steel is caused by Ti 4 C 2 S 2 Is reduced by the formation of (a). Spherical Ti 4 C 2 S 2 The steel has high hardness, does not deform during high-temperature forging, and can improve the impact toughness of the steel.
Ti, Y and Al can also form binary or ternary eutectic liquid phase at relatively low temperature in the cooling process of molten steel, and the appearance of the liquid phase is favorable for the molten steel to flow to a certain extent when grains are initially formed in the forming process, so that the densification distribution of the grains is promoted.
In the above embodiment, the composition of the upper die body further comprises 0.015 part of alloy steel modifier, and the alloy steel modifier comprises 45 parts of Al 2 O 3 26 parts of Al, 16 parts of CaF 2 10 parts MgO and 3 parts LaNi 5 。
In the above embodiment, the upper die body further comprises 0.018 parts of alloy steel modifier comprising 32 parts of Al 2 O 3 31 parts of Al, 19 parts of CaF 2 13 parts MgO and 5 parts LaNi 5 。
When tapping, the ladle slag can be deoxidized and modified by adding the components, so that the desulfurization rate of molten steel is improved, and floating calcium carbide and aluminum particles are adopted to carry out diffusion deoxidization, so that the ladle slag is promoted to be melted rapidly and deoxidized uniformly. Mg with good thermal stability is easy to obtain 2 NiLa，Mg 2 Ni，MgNi 2 A three-phase alloy. Since Ti element has extremely active chemical properties and reacts with 0, N, etc. in molten steel easily, ti microalloying is selected before tapping of molten steel to stabilize the yield of Ti element.
Example 4:
the following modifications were made on the basis of the above embodiments: the die comprises an upper die holder 10 and an upper die body 20, wherein a mounting notch 30 for mounting the upper die body 20 is arranged on the upper die holder 10, an adjusting groove 40 is arranged on the side wall of the mounting notch 30, a pressing structure for adjusting the state of the upper die body 20 is arranged in the adjusting groove 40, the pressing structure comprises an adjusting piece 80 arranged in the adjusting groove 40, a jackscrew 70 is arranged on the upper die holder 10, and the end part of the jackscrew 70 extends to the inner wall of the adjusting groove 40 and is abutted against one side of the adjusting piece 80 opposite to the upper die body 20. The adjusting piece 80 is loosened or pressed against the handle portion of the upper die body 20 by the ultra-fine distance travel adjustment of the jackscrew 70, and then can be disassembled and assembled, so that the operation is simple, the structure is relatively simple, the practicability is strong, and the reliability is high.
The upper die holder 10 is provided with the limit groove 50, the upper die body 20 is provided with the limit body 60 matched with the limit groove 50, and the upper die body 20 can be linearly fed and dismounted along the depth direction of the mounting notch through the adaptive mounting of the limit body 60 and the limit groove 50 without continuous mounting in the vertical direction, so that the labor intensity can be obviously reduced.
The upper die holder 10 is further provided with a counter bore 100, and a spring 90 and a bolt 130 penetrating the inside of the spring 90 and connected with the adjusting member 80 are arranged in the counter bore 100. The bolt 130 penetrates through the spring 90 to be connected with the adjusting piece 80, and is matched with the jackscrew 70 to be used, so that the upper die body 20 of the upper die body can be assembled and disassembled in an ultra-micro mode.
When in use, the upper die body 20 is horizontally and transversely assembled through the limit body 60 and the limit groove 50, after the upper die body 20 is assembled in place, the travel of the top wire 70 is controlled to be about 5 wires (or the range of one quarter circle to one half circle is adjusted), the adjusting piece 80 can be moved to one side close to the upper die body 20, the jacking operation of the upper die body 20 is further completed, the spring 90 can be further compressed in the process, when the upper die body 20 needs to be replaced in a non-press-fitting state, the top wire 70 is reversely rotated to enable the travel to be about 5 wires (or the range of one quarter circle to one half circle is adjusted), the process is gradually restored due to the compression degree of the spring 90, the adjusting piece 80 can be moved to one side far away from the upper die body 20, at the moment, only the upper die body 20 needs to be horizontally and transversely removed from the inside of the installation notch 30, the new upper die body 20 is reinstalled, and the top wire 70 is readjusted to press the upper die body 20 through the adjusting piece 80.
The following modifications were made on the basis of the above embodiments: the upper mold body 20 is provided with a positioning area 110 recessed inward, one side of the adjusting member 80 opposite to the upper mold body 20 is provided with an outer protruding pushing area 120 adapted to the positioning area 110, and the cross sections of the positioning area 110 and the outer protruding pushing area 120 are arranged in a circular arc, conical or rectangular structure. Preferably, the positioning area 110 and the outer protruding pushing area 120 are arranged in a conical structure, and the conical structure is arranged to have an automatic correction effect, so that the upper die body 20 is difficult to enter the mounting notch if the precision of the limiting groove 50 and the limiting body 60 cannot be processed. The reason that sets up like this is established on the tradition is that the adaptation through bolt and groove is accomplished and is hung the basis of die shank, and the precision in groove can't carry out accurate assurance, if too accurate, can make the bolt unable smooth entering inslot form the effect of grafting installation die shank. By adopting the scheme, the die body can be pressed and assembled to ensure that the die body smoothly enters the corresponding position for coarse accuracy, the high-accuracy installation is completed through the correction effect of the adjusting piece 80 and the positioning area 110, and the accuracy of the downward movement stroke of the upper die body 20 can be ensured due to the high-accuracy installation, so that the bending angle is more accurate when the accuracy of the downward movement stroke is higher. The traditional quick change device for the upper die cannot achieve high-precision control of the downward moving stroke, and the embodiment can easily solve the problem and is simple in structure and high in practicality.
A processing method of an upper die quick clamping device comprises the following processing steps:
(1) Smelting
Smelting by adopting the material of claim 1, and adding 0.013-0.023 part of alloy steel modifier during tapping to prepare forging blanks of the upper die body and the adjusting piece material;
(2) Destressing annealing treatment for forging and forgings
Heating the obtained forging blank to 1250-1450 ℃ for forging, and obtaining a forging piece at a final forging temperature of 950-970 ℃; annealing the obtained forge piece through an annealing furnace, wherein the annealing temperature is 680-750 ℃, the annealing time is 4-5 h, cooling to 200-300 ℃ in the annealing furnace, preserving heat for 0.6-1.2 h, and then cooling to normal temperature;
(3) Preliminary working and heat treatment of forgings
Processing the forge piece into a primary shape of a die on a machine tool, wherein each surface keeps a margin of 1.5 mm; heating the die obtained by machining to 530-550 ℃ and then preserving heat for 3-4 hours, then heating to 750-800 ℃ and preserving heat for 1-2 hours, then heating to 940-960 ℃, preserving heat for 30-45 minutes and then quenching, oil quenching, cooling and then carrying out cryogenic treatment, wherein the temperature of the cryogenic treatment is-220 ℃ to-230 ℃, the temperature is maintained for 1-2 hours, the die is restored to normal temperature in air, primary tempering is carried out, the tempering temperature is 130-140 ℃, cooling is carried out to normal temperature and then placing for 1-1.5 hours, secondary tempering is carried out, and the tempering temperature is 150-170 ℃;
(4) Deep processing and processing center treatment of upper die body and adjusting piece
Removing an oxide layer on the surface of the treated die, assembling the die on a grinding machine, grinding, reserving a margin of 0.7-1 mm on each surface, and grinding the other surfaces except the cambered surface to the required size again after the die is placed for at least 1 day; and (3) putting the workpiece obtained by deep processing into a processing center, milling the cambered surface of the die by adopting a milling cutter, and removing the allowance of 0.7-1 mm.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitutions may be partial structures, devices, or method steps, or may be a complete solution. The technical proposal and the invention concept are equivalent to or changed in accordance with the invention, and the invention is covered in the protection scope of the invention.
Claims (9)
1. The quick clamping device for the upper die comprises an upper die body, wherein the upper die body comprises the following components in percentage by mass: 0.17 to 0.52 part of C, 0.17 to 0.31 part of Si, 5.44 to 8.15 parts of Mn, 7.13 to 11.58 parts of Cr, 4.15 to 6.55 parts of Ni, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.021 to 0.038 part of Nb, 0.012 to 0.017 part of Y, 0.07 to 0.23 part of Ti, 0.08 to 0.14 part of B, and the balance of Fe and impurities;
wherein: ti=0.21 (nb+y) +0.34 (c+s);
wherein: si=0.21b+0.015 (ni+cr).
2. The rapid clamping device for an upper die according to claim 1, wherein the upper die body comprises the following components in percentage by mass: 0.19 to 0.50 part of C, 0.21 to 0.28 part of Si, 5.87 to 7.65 parts of Mn, 8.15 to 9.54 parts of Cr, 4.65 to 6.15 parts of Ni, 0.891 to 2.030 parts of Mo, less than or equal to 0.02 part of P, less than or equal to 0.02 part of S, 0.025 to 0.037 part of Nb, 0.014 to 0.016 part of Y, 0.09 to 0.20 part of Ti, and the balance of Fe and impurities.
3. The upper die quick clamping device according to claim 1, wherein the components of the upper die body further comprise 0.013-0.023 parts of alloy steel modifier, and the alloy steel modifier comprises 32-45 parts of Al 2 O 3 26-31 parts of Al and 16-28 parts of CaF 2 5 to 15 parts of MgO and 2 to 5 parts of LaNi 5 。
4. The upper die rapid clamping device according to claim 1, further comprising an upper die holder (10), wherein an installation notch (30) for installing an upper die body (20) is arranged on the upper die holder (10), an adjusting groove (40) is arranged on the side wall of the installation notch (30), a pressing structure for adjusting the state of the upper die body (20) is arranged in the adjusting groove (40), a limiting groove (50) is arranged on the upper die holder (10), and a limiting body (60) matched with the limiting groove (50) is arranged on the upper die body (20).
5. The quick clamping device for an upper die according to claim 4, wherein the pressing structure comprises an adjusting member (80) arranged in the adjusting groove (40), the material of the adjusting member (80) is consistent with that of the upper die body, a jackscrew (70) is arranged on the upper die holder (10), the end part of the jackscrew (70) extends to the inner wall of the adjusting groove (40) and abuts against one side of the adjusting member (80) opposite to the upper die body (20), a counter bore (100) is further arranged on the upper die holder (10), and a spring (90) and a bolt (130) penetrating through the spring (90) and connected with the adjusting member (80) are arranged in the counter bore (100).
6. The rapid upper die clamping device according to claim 4, wherein the upper die body (20) is provided with a positioning area (110) recessed inwards, and one side of the adjusting piece (80) opposite to the upper die body (20) is provided with an outer protruding pushing area (120) matched with the positioning area (110).
7. The rapid clamping device for an upper die according to claim 6, wherein the cross sections of the positioning area (110) and the outer protruding pushing area (120) are arranged in a circular arc, cone or rectangular structure.
8. A processing method of an upper die quick clamping device is characterized by comprising the following processing steps:
(1) Smelting
Smelting by adopting the material of claim 1, and adding 0.013-0.023 part of alloy steel modifier during tapping to prepare forging blanks of the upper die body and the adjusting piece material;
(2) Destressing annealing treatment for forging and forgings
Heating the obtained forging blank to 1250-1450 ℃ for forging, and obtaining a forging piece at a final forging temperature of 950-970 ℃; annealing the obtained forge piece through an annealing furnace, wherein the annealing temperature is 680-750 ℃, the annealing time is 4-5 h, cooling to 200-300 ℃ in the annealing furnace, preserving heat for 0.6-1.2 h, and then cooling to normal temperature;
(3) Preliminary working and heat treatment of forgings
Processing the forge piece into a primary shape of a die on a machine tool, wherein each surface keeps a margin of 1.5 mm; heating the die obtained by machining to 530-550 ℃ and then preserving heat for 3-4 hours, then heating to 750-800 ℃ and preserving heat for 1-2 hours, then heating to 940-960 ℃, preserving heat for 30-45 minutes and then quenching, oil quenching, cooling and then carrying out cryogenic treatment, wherein the temperature of the cryogenic treatment is-220 ℃ to-230 ℃, the temperature is maintained for 1-2 hours, the die is restored to normal temperature in air, primary tempering is carried out, the tempering temperature is 130-140 ℃, cooling is carried out to normal temperature and then placing for 1-1.5 hours, secondary tempering is carried out, and the tempering temperature is 150-170 ℃;
(4) Deep processing and processing center treatment of upper die body and adjusting piece
Removing an oxide layer on the surface of the treated die, assembling the die on a grinding machine, grinding, reserving a margin of 0.7-1 mm on each surface, and grinding the other surfaces except the cambered surface to the required size again after the die is placed for at least 1 day; and (3) putting the workpiece obtained by deep processing into a processing center, milling the cambered surface of the die by adopting a milling cutter, and removing the allowance of 0.7-1 mm.
9. The application method of the upper die quick clamping device is characterized by comprising the following steps: firstly, the upper die body (20) is horizontally and transversely installed through the limiting body (60) and the limiting groove (50), after the upper die body is installed in place, the adjusting piece (80) can be moved to one side close to the upper die body (20) through adjusting the range of one quarter turn to one half turn through the stroke of the jackscrew (70), and then the jacking operation of the upper die body (20) is completed, and in the process, the spring (90) can be further compressed;
when the press-fit state is required to be removed for replacement, the jackscrew (70) is reversely rotated to adjust the stroke by one quarter circle to one half circle, the compression degree of the spring (90) is gradually recovered in the process, the adjusting piece (80) moves to one side far away from the upper die body (20), at the moment, the upper die body (20) is only required to be horizontally and transversely removed from the inside of the mounting notch (30), a new upper die body (20) is reinstalled, and the jackscrew (70) is readjusted to press the upper die body (20) through the adjusting piece (80).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211678593.8A CN116000192A (en) | 2022-12-26 | 2022-12-26 | Application method of upper die quick clamping device |
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| CN202211678593.8A CN116000192A (en) | 2022-12-26 | 2022-12-26 | Application method of upper die quick clamping device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102702548B1 (en) | 2023-12-27 | 2024-09-11 | (주) 엠에스엠 | Steel plate bending module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102702548B1 (en) | 2023-12-27 | 2024-09-11 | (주) 엠에스엠 | Steel plate bending module |
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