A metal material vacuum hot forging die and processing method

Abstract

The present invention discloses a vacuum hot forging die for metal materials, comprising an upper die plate and a lower die plate, wherein the upper die plate has an upper die pressing core, the lower die plate has a forging cavity, and the lower die plate is also provided with a vacuum tube, one end of the vacuum tube is connected to the forging cavity, a sealing element is provided between the upper die plate and the lower die plate, and the sealing element is provided around the upper die pressing core and the forging cavity; the lower die plate is also provided with a sleeve tube groove, the sleeve tube groove is connected to the forging cavity, a mold strip is provided in the sleeve tube groove, a sealing component is provided between the mold strip and the lower die plate, and a positioning channel is provided between the mold strip and the sleeve tube groove for allowing the sleeve vacuum tube to pass through. The present invention also provides a vacuum hot forging forming method for metal materials, wherein the metal material is heated to a desired temperature while the inner cavity of the sleeve is kept vacuumed, and at the same time, the forging is completed while the forging cavity is kept vacuumed, so that the metal material is in a double vacuum protection state during the hot working process and is not easily oxidized.

Description

Technical Field

[0001] The invention relates to the technical field of hot processing of metal materials, and in particular to a metal material vacuum hot forging forming die and a processing method. Background Art

[0002] Hot working can change the structure of metal materials while forming or change the established state of formed materials to improve the mechanical properties of parts. It is an effective method to improve the high-temperature mechanical properties of metal materials. In particular, high-strength and high-toughness vanadium alloy plates generally require multiple hot working. For high-temperature heat treatment of metal materials such as vanadium alloys, it is particularly important to reduce the oxidation behavior caused by contact with air during material processing. To this end, a common measure is to sheath the metal material and then perform hot working.

[0003] At present, the high-temperature hot processing of metal materials is easy to oxidize, with low production efficiency and high cost, and it is impossible to detect whether the sleeve is leaking after the sealing welding is completed. The Chinese patent with publication number CN101745591A discloses a metal forging forming device and a processing method thereof, which discloses a forging device, but still does not mention how to prevent the material from oxidation.

[0004] Therefore, how to solve the problem in the prior art that the high-temperature hot processing sheath of metal materials is easily oxidized and the production efficiency is low has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a vacuum hot forging die and processing method for metal materials to solve the problems existing in the above-mentioned prior art, prevent the metal materials from being oxidized during high-temperature processing, and improve production efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a vacuum hot forging forming die for metal materials, comprising an upper die plate and a lower die plate, wherein the upper die plate has a protruding upper die pressing core, and the lower die plate has a forging cavity matched with the upper die pressing core, and the lower die plate is also provided with a vacuum tube, one end of the vacuum tube is connected with the forging cavity, and the other end of the vacuum tube extends out of the lower die plate and can be connected with a vacuum pump, and a sealing element is also provided between the upper die plate and the lower die plate, and the sealing element is arranged around the upper die pressing core and the forging cavity; the lower die plate is also provided with a sleeve tube groove, which is connected with the forging cavity, a mold strip is arranged in the sleeve tube groove, and the mold strip is plug-connected with the sleeve tube groove, a sealing component is arranged between the mold strip and the lower die plate, and a positioning channel for allowing the sleeve vacuum tube to pass therethrough is provided between the mold strip and the sleeve tube groove.

[0007] Preferably, the upper template is provided with a guide column, and the lower template has a guide column groove matched with the guide column, and the guide column can be slidably arranged in the guide column groove.

[0008] Preferably, the number of the guide posts and the number of the guide post grooves are both four, and the four guide posts are arranged at the four corners of the upper template and are symmetrical in pairs.

[0009] Preferably, the upper template has a first sealing groove, the lower template has a second sealing groove, the mold molding has a groove matching the first sealing groove, the first sealing groove and the second sealing groove are arranged opposite to each other, and the space enclosed by the first sealing groove and the second sealing groove can accommodate the sealing element.

[0010] Preferably, the first sealing groove and the second sealing groove are both annular.

[0011] Preferably, the sleeve tube groove is a U-shaped groove, the bottom of the mold strip has a positioning groove with a semicircular cross-section, the positioning groove is arranged toward the bottom of the sleeve tube groove, the positioning groove and the sleeve tube groove form the positioning channel, and the top of the mold strip is flush with the top of the lower template.

[0012] Preferably, an O-shaped groove capable of accommodating an O-ring is provided in the positioning groove.

[0013] Preferably, the axis of the sheath tube groove is parallel to the axis of the vacuum tube.

[0014] The present invention also provides a vacuum hot forging forming method for a metal material, comprising the following steps:

[0015] Step 1: Put the metal material to be forged into the sheath, connect the sheath vacuum tube at the corner of the sheath, seal the sheath, and evacuate the inner cavity of the sheath through the sheath vacuum tube;

[0016] Step 2: heating the metal material to a desired temperature while keeping the inner cavity of the package vacuumed;

[0017] Step 3: Place the sleeve into the forging cavity, the sleeve vacuum tube is located in the sleeve tube groove and extends out of the lower template, and the mold pressure strip is placed in the sleeve pipe, that is, the sleeve vacuum tube is located in the positioning channel;

[0018] Step 4: The upper mold plate and the lower mold plate are closed, the upper mold core is in contact with the sleeve, and the forging chamber is evacuated through the vacuum tube;

[0019] Step 5: Apply force to the upper template through the hydraulic press, and close the upper template and the lower template until they abut against each other;

[0020] Step 6: Open the mold, take out the mold strip, and take out the sample.

[0021] Preferably, in step one, the sheath is made of stainless steel, the sheath vacuum tube is connected to the sheath by welding, and after the metal material is placed in the sheath, the remaining edges of the sheath except the sheath vacuum tube are seam welded and sealed.

[0022] Compared with the prior art, the present invention has achieved the following technical effects: the metal material vacuum hot forging forming die of the present invention comprises an upper die plate and a lower die plate, the upper die plate has a protruding upper die pressing core, the lower die plate has a forging cavity matched with the upper die pressing core, the lower die plate is also provided with a vacuum tube, one end of the vacuum tube is connected with the forging cavity, the other end of the vacuum tube extends out of the lower die plate and can be connected with a vacuum pump, a sealing element is also provided between the upper die plate and the lower die plate, the sealing element is arranged around the upper die pressing core and the forging cavity; the lower die plate is also provided with a sleeve tube groove, the sleeve tube groove is connected with the forging cavity, a mold strip is arranged in the sleeve tube groove, the mold strip is plug-connected with the sleeve tube groove, a sealing assembly is arranged between the mold strip and the lower die plate, and a positioning channel is provided between the mold strip and the sleeve tube groove for allowing the sleeve vacuum tube to pass through. The present invention also provides a vacuum hot forging forming method for metal materials, in which the metal material is heated to a desired temperature while the inner cavity of the sheath is kept evacuated, and at the same time, the forging is completed while the forging chamber is kept evacuated, so that the metal material is in a double vacuum protection state during the hot processing process, is not easily oxidized, and the production efficiency and yield rate are improved. In addition, the use of the metal material vacuum hot forging forming mold of the present invention solves the problem of being unable to detect whether the sheath tube is leaking after the sealing and welding is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a structural schematic diagram of the lower mold plate of the metal material vacuum hot forging mold of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the upper mold plate of the metal material vacuum hot forging mold of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a mold pressure strip of a metal material vacuum hot forging mold of the present invention;

[0027] Among them, 1 is the upper template, 2 is the lower template, 3 is the upper mold core, 4 is the forging cavity, 5 is the vacuum tube, 6 is the sleeve tube groove, 7 is the mold strip, 8 is the guide column, 9 is the guide column groove, 10 is the first sealing groove, 11 is the second sealing groove, and 12 is the positioning groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a vacuum hot forging die and processing method for metal materials to solve the problems existing in the above-mentioned prior art, prevent the metal materials from being oxidized during high-temperature processing, and improve production efficiency.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 1-3 ,in, Figure 1 It is a structural schematic diagram of the lower mold plate of the metal material vacuum hot forging mold of the present invention, Figure 2 It is a structural schematic diagram of the upper mold plate of the metal material vacuum hot forging mold of the present invention, Figure 3 It is a schematic structural diagram of the die pressure strip of the metal material vacuum hot forging die of the present invention.

[0032] The present invention provides a vacuum hot forging forming die for metal materials, comprising an upper die plate 1 and a lower die plate 2, wherein the upper die plate 1 has a protruding upper die pressing core 3, the lower die plate 2 has a forging cavity 4 matched with the upper die pressing core 3, the lower die plate 2 is further provided with a vacuum tube 5, one end of the vacuum tube 5 is connected with the forging cavity 4, the other end of the vacuum tube 5 extends out of the lower die plate 2 and can be connected with a vacuum pump, a sealing element is further provided between the upper die plate 1 and the lower die plate 2, and the sealing element is arranged around the upper die pressing core 3 and the forging cavity 4; the lower die plate 2 is further provided with a sleeve tube groove 6, the sleeve tube groove 6 is connected with the forging cavity 4, a mold strip 7 is arranged in the sleeve tube groove 6, the mold strip 7 is plug-connected with the sleeve tube groove 6, a sealing component is arranged between the mold strip 7 and the lower die plate 2, and a positioning channel for allowing the sleeve vacuum tube to pass therethrough is provided between the mold strip 7 and the sleeve tube groove 6.

[0033] When the metal material vacuum hot forging forming die of the present invention is used for hot processing of the metal material, the metal material is heated to the required temperature while the inner cavity of the sheath is kept evacuated. At the same time, the forging is completed while the forging chamber 4 is kept evacuated. The metal material is in a double vacuum protection state during the hot processing and is not easily oxidized, thereby improving the production efficiency and the yield rate. In addition, the use of the metal material vacuum hot forging forming die of the present invention solves the problem of being unable to detect whether the sheath tube is leaking when the sealing welding is completed.

[0034] Among them, the upper template 1 is provided with a guide column 8, and the lower template 2 has a guide column groove 9 adapted to the guide column 8. The guide column 8 is slidably arranged in the guide column groove 9. The guide column 8 and the guide column groove 9 provide a guiding function for the upper template 1 and the lower template 2 to close the mold.

[0035] In this specific embodiment, the number of guide pillars 8 and guide pillar grooves 9 are both four. The four guide pillars 8 are arranged at the four corners of the upper template 1 and are symmetrical in pairs. The four guide pillars 8 form a rectangle to provide stable guidance for the upper template 1 and the lower template 2 to improve the mold closing accuracy.

[0036] Specifically, the upper template 1 has a first sealing groove 10, the lower template 2 has a second sealing groove 11, the mold strip 7 has a groove matching the first sealing groove 10, the first sealing groove 10 and the second sealing groove 11 are arranged opposite to each other, and the space enclosed by the first sealing groove 10 and the second sealing groove 11 can accommodate a sealing element, which ensures the airtightness of the upper template 1 and the lower template 2 when the mold is closed. The first sealing groove 10 and the second sealing groove 11 provide an installation position for the sealing element and facilitate the positioning of the sealing element.

[0037] In order to ensure the sealing of the forging cavity 4 when the upper mold plate 1 and the lower mold plate 2 are closed, the first sealing groove 10 and the second sealing groove 11 are both annular, and the forging cavity 4 is located in the inner circle of the first sealing groove 10 and the second sealing groove 11.

[0038] More specifically, the sleeve tube groove 6 is a U-shaped groove, and the bottom of the mold strip 7 has a positioning groove 12 with a semicircular cross-section. The positioning groove 12 is arranged toward the bottom of the sleeve tube groove 6. The positioning groove 12 and the sleeve tube groove 6 form a positioning channel, and the positioning channel can allow the sleeve vacuum tube to pass through. The top of the mold strip 7 is flush with the top of the lower template 2, so as to avoid the mold strip 7 affecting the mold closing accuracy of the upper template 1 and the lower template 2, and at the same time avoid the gap between the mold strip 7 and the upper template 1, which leads to a decrease in the airtightness of the forging cavity 4.

[0039] Furthermore, an O-shaped groove capable of accommodating an O-shaped ring is provided in the positioning groove 12 . In order not to affect the air tightness of the forging chamber 4 , an O-shaped ring is sheathed on the outer surface of the sheathed vacuum tube.

[0040] In this specific embodiment, the axis of the sheathed tube groove 6 is parallel to the axis of the vacuum tube 5, which facilitates the connection of the sheathed vacuum tube and the vacuum tube 5 with the vacuum pumping device and reduces the labor intensity of the operator.

[0041] The present invention also provides a vacuum hot forging forming method for a metal material, comprising the following steps:

[0042] Step 1: Prepare the sleeve, put the metal material to be forged into the sleeve, connect the sleeve vacuum tube at the corners of the sleeve, the sleeve is made of stainless steel, and the sleeve vacuum tube is welded to the sleeve. After the metal material is put into the sleeve, the remaining edges of the sleeve except the sleeve vacuum tube are seam welded and sealed, and the inner cavity of the sleeve is evacuated through the sleeve vacuum tube.

[0043] Step 2: Use a high-frequency heating furnace to heat the metal material, use an infrared thermometer to measure the temperature of the metal material, and heat the metal material to a desired temperature while keeping the inner cavity of the package vacuumed.

[0044] Step 3: put the sheath into the forging cavity 4, the sheath vacuum tube is located in the sheath tube groove 6 and extends out of the lower mold plate 2, and the mold pressure strip 7 is placed in the sheath pipe, that is, the sheath vacuum tube is located in the positioning channel.

[0045] Step 4: The upper mold plate 1 and the lower mold plate 2 are closed, the upper mold core 3 is in contact with the sleeve, and the forging chamber 4 is evacuated through the vacuum tube 5.

[0046] Step 5: Apply downward force to the upper mold plate 1 through the hydraulic press, and close the upper mold plate 1 and the lower mold plate 2 until the two are in contact and the mold is closed.

[0047] Step 6: open the mold, take out the mold bead 7, take out the sample, and turn off the vacuum device.

[0048] The metal material vacuum hot forging forming processing method of the present invention heats the metal material to a desired temperature while keeping the inner cavity of the sheath evacuated, and at the same time, completes the forging while keeping the forging chamber 4 evacuated, so that the metal material is in a double vacuum protection state during the hot processing, is not easy to oxidize, improves production efficiency and yield rate, and reduces production costs.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A vacuum hot forging die for metal materials, characterized in that: The invention comprises an upper mold plate and a lower mold plate, wherein the upper mold plate has a protruding upper mold core, the lower mold plate has a forging cavity matched with the upper mold core, the lower mold plate is also provided with a vacuum tube, one end of the vacuum tube is connected with the forging cavity, the other end of the vacuum tube extends out of the lower mold plate and can be connected with a vacuum pump, a sealing element is also provided between the upper mold plate and the lower mold plate, the sealing element is arranged around the upper mold core and the forging cavity; the lower mold plate is also provided with a sleeve pipe groove, the sleeve pipe groove is connected with the forging cavity, a mold strip is arranged in the sleeve pipe groove, the mold strip is plug-connected with the sleeve pipe groove, a sealing component is arranged between the mold strip and the lower mold plate, and a positioning channel for allowing the sleeve vacuum tube to pass through is provided between the mold strip and the sleeve pipe groove; The upper template is provided with a guide post, and the lower template is provided with a guide post groove adapted to the guide post, and the guide post is slidably arranged in the guide post groove; The upper mold plate has a first sealing groove, the lower mold plate has a second sealing groove, the mold molding has a groove matching the first sealing groove, the first sealing groove and the second sealing groove are arranged opposite to each other, and the space enclosed by the first sealing groove and the second sealing groove can accommodate the sealing element; The sleeve pipe groove is a U-shaped groove, the bottom of the mold bead has a positioning groove with a semicircular cross section, the positioning groove is arranged toward the bottom of the sleeve pipe groove, the positioning groove and the sleeve pipe groove form the positioning channel, and the top of the mold bead is flush with the top of the lower template; The axis of the sleeve tube groove is parallel to the axis of the vacuum tube.

2. The metal material vacuum hot forging die according to claim 1, characterized in that: The number of the guide posts and the guide post grooves are both four, and the four guide posts are arranged at the four corners of the upper template and are symmetrical in pairs.

3. The metal material vacuum hot forging die according to claim 1, characterized in that: The first sealing groove and the second sealing groove are both annular.

4. The metal material vacuum hot forging die according to claim 1, characterized in that: An O-shaped groove capable of accommodating an O-shaped ring is arranged in the positioning groove.

5. A method for vacuum hot forging of metal materials, using the metal material vacuum hot forging die according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Put the metal material to be forged into the sheath, connect the sheath vacuum tube at the corner of the sheath, seal the sheath, and evacuate the inner cavity of the sheath through the sheath vacuum tube; Step 2: heating the metal material to a desired temperature while keeping the inner cavity of the package vacuumed; Step 3: Place the sleeve into the forging cavity, the sleeve vacuum tube is located in the sleeve tube groove and extends out of the lower template, and the mold pressure strip is placed in the sleeve pipe, that is, the sleeve vacuum tube is located in the positioning channel; Step 4: The upper mold plate and the lower mold plate are closed, the upper mold core is in contact with the sleeve, and the forging chamber is evacuated through the vacuum tube; Step 5: Apply force to the upper template through the hydraulic press, and close the upper template and the lower template until they abut against each other; Step 6: Open the mold, take out the mold strip, and take out the sample.

6. The metal material vacuum hot forging forming method according to claim 5, characterized in that: In step 1, the sheath is made of stainless steel, the sheath vacuum tube is connected to the sheath by welding, and after the metal material is placed in the sheath, the remaining edges of the sheath except the sheath vacuum tube are seam welded and sealed.

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