Die suitable for flat die quenching test of hot forming steel plate

Abstract

The utility model discloses a die suitable for a flat die quenching test of a hot forming steel plate, belongs to the technical field of hot forming plate quenching performance test equipment, and is used for the flat die quenching test of the hot forming steel plate. According to the technical scheme, a male die radiator is fixed to the upper portion of a male die, a female die radiator is fixed to the lower portion of a female die, radiating fans are installed at the front ends of the radiators respectively, the lower ends of four die guide columns are fixed in guide column holes in the four corners of the female die respectively, and the four die guide columns penetrate through the male die and the guide column holes in the four corners of the male die radiator respectively. The die guide column is in sliding fit with guide column holes of the male die and the male die radiator, the two ends of the die handle mounting plate are fixed to the upper surface of the male die radiator, the lower end of the die handle is fixedly connected with the center of the die handle mounting plate, and the die handle is connected with a push rod at the lower end of the power device. The mold is simple in structure, convenient to use, good in air-cooling heat dissipation effect, fast in mold cooling, convenient to maintain and low in manufacturing cost, does not have a complicated structure of a built-in water channel, and meets the preparation requirements of flat mold quenching samples.

Description

Technical Field

[0001] This utility model relates to an air-cooled flat mold for quenching test of hot-formed steel sheets, belonging to the technical field of quenching performance testing equipment for hot-formed sheets. Background Technology

[0002] The application of ultra-high strength hot-formed steel is one of the important solutions for lightweighting products in the automotive and machinery industries. The high strength of hot-formed steel is only manifested after the microstructure transformation is completed following hot forming and quenching. Therefore, to understand whether hot-formed steel can meet the application requirements, quenching tests are necessary. Flat die quenching is the most common type of quenching test, its purpose being to prepare small-sized hot-formed quenched samples for subsequent performance testing and analysis. Currently, most flat die quenching test molds use built-in water cooling systems. This mode has advantages such as strong cooling capacity and short stamping cycles, but it also has disadvantages such as high mold manufacturing costs, difficult sealing and maintenance, high requirements for mold corrosion resistance, and the need for a dedicated water chiller to provide cooling water. Flat die quenching tests for hot-formed sheets are characterized by small sample size, relatively small heat input, low test cycle requirements, and a relatively slow test pace. However, complex water-cooled molds have excessive capacity margins and high test costs for flat die quenching tests, making them unsuitable for hot-formed sheet flat die quenching tests. Therefore, it is essential to design flat die quenching test molds suitable for hot-formed steel sheets. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a mold suitable for flat mold quenching test of hot-formed steel sheet. This flat mold quenching test mold can be used to prepare flat mold quenching test specimens of hot-formed sheet, and has the advantages of small size, light weight, no water channel, fast cooling speed and low cost.

[0004] The technical solution of this utility model is:

[0005] A mold suitable for quenching tests of hot-formed steel sheets using a flat die includes a punch, a punch heat sink, a punch cooling fan, a die, a die heat sink, a die cooling fan, a mold guide post, an elastic support sleeve, a mold shank, and a mold shank mounting plate. The punch and punch heat sink are both equal rectangles, with the punch heat sink fixed above the punch. The die and die heat sink are both equal rectangles, with the die heat sink fixed below the die. The punch cooling fan and die cooling fan are respectively mounted on the front ends of the punch heat sink and the die heat sink. The four corners of the punch heat sink, punch, and die are... The die has guide pin holes. The lower ends of the four mold guide pins are fixed in the guide pin holes at the four corners of the die cavity. Four elastic support sleeves are respectively fitted onto the four mold guide pins on the upper surface of the die cavity. The four mold guide pins pass through the guide pin holes at the four corners of the punch and the punch radiator. The mold guide pins and the guide pin holes of the punch and the punch radiator are in sliding fit. The mold shank mounting plate is a rectangular plate. The two ends of the mold shank mounting plate are respectively fixedly connected to the two ends of the upper surface of the punch radiator. The mold shank is a cylindrical body. The lower end of the mold shank is fixedly connected to the center of the mold shank mounting plate. The cylindrical body of the mold shank is connected to the lower push rod of the power unit.

[0006] The aforementioned mold suitable for the flat die quenching test of hot-formed steel sheet, wherein the punch heat sink and the die heat sink are respectively fixed to the upper surface of the punch and the lower surface of the die by heat sink mounting bolts, the contact surfaces of the punch heat sink and the die heat sink with the punch and the die are uniformly coated with high-temperature resistant thermally conductive adhesive, and the heat dissipation fins of the punch heat sink and the die heat sink face upwards and downwards respectively.

[0007] The aforementioned mold suitable for the quenching test of hot-formed steel sheet flat mold, wherein the heat dissipation fan of the punch and the heat dissipation fan of the die are respectively composed of a fan mounting frame and a micro axial flow fan. The fan mounting frame is rectangular, and the length of the fan mounting frame matches the length of the punch radiator and the die radiator. Multiple micro axial flow fans are arranged and fixed in sequence in the fan mounting frame, and the air outlets of the micro axial flow fans are respectively opposite to the heat dissipation fins of the punch radiator and the die radiator.

[0008] The aforementioned mold suitable for the quenching test of flat mold for hot-formed steel sheets has threaded holes at the four corners of the concave mold, and the lower ends of the four mold guide pillars are threaded and connected to the four guide holes of the concave mold. The lower surface of the punch has upward steps at both ends, and the guide holes at the four corners of the punch are located on the stepped surface. The upper and lower ends of the four elastic support sleeves are in contact with the lower and upper surfaces of the guide holes of the punch and the concave mold, respectively. The height of the elastic support sleeves ensures that the punch and concave mold are compressed when they are closed, thus providing support for the punch.

[0009] The above-mentioned mold suitable for the quenching test of hot-formed steel sheet flat mold, wherein the mold handle mounting plate is installed on the upper surface of the punch heat sink by the mold handle mounting plate fixing bolt, the lower end of the mold handle cylinder is fixedly connected to the center of the mold handle mounting plate by the mold handle mounting bolt, the inner wall of the inner hole of the mold handle cylinder has threads, the lower end push rod of the power device is connected to the mold handle cylinder by the threads, and the central axis of the mold handle cylinder coincides with the central axis of the punch.

[0010] The beneficial effects of this utility model are:

[0011] The present invention provides a punch heat sink and a die heat sink above the punch and below the die, respectively. The axial flow fans of the punch heat sink and the die heat sink blow air to the punch heat sink and the die heat sink, respectively. The punch heat sink and the die heat sink have a finned heat dissipation structure with a large heat dissipation area, which can realize rapid heat dissipation of the mold. The four mold guide pillars can guide the punch to slide, so as to achieve stable stamping.

[0012] This invention features a simple structure and convenient use. The mold has no complex internal water channel structure, provides good air cooling, cools down quickly, is easy to maintain, and has low manufacturing cost. It meets the requirements for preparing flat mold quenching samples and has great value for widespread application. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 The front view;

[0015] Figure 3 yes Figure 1 Top view;

[0016] Figure 4 yes Figure 1 Side view;

[0017] Figure 5 yes Figure 2 The center section view;

[0018] Figure 6 yes Figure 4 A sectional view;

[0019] Figure 7 This is a schematic diagram of the utility model in use.

[0020] The markings in the diagram are as follows: 1. Die handle 2. Die handle mounting plate 3. Punch radiator 4. Punch 5. Die guide post 6. Blank 7. Elastic support sleeve 8. Die cavity 9. Die cavity radiator 10. Die cavity radiator 11. Miniature axial flow fan 12. Die handle mounting bolt 13. Die handle mounting plate fixing bolt 14. Radiator mounting bolt 15. Power unit 16. Die frame 17. Detailed Implementation

[0021] This utility model consists of a punch 5, a die 9, a punch radiator 3, a punch cooling fan 4, a die radiator 11, a die cooling fan 10, a mold guide post 6, an elastic support sleeve 8, a mold handle 1, and a mold handle mounting plate 2.

[0022] Figure 1-6 The punch radiator 3 is connected to the punch 5 as a whole by radiator mounting bolts 15. The contact surfaces between them are uniformly coated with high-temperature resistant thermally conductive adhesive, and the heat dissipation fins of the punch radiator 4 face upward. The die shank mounting plate 2 is installed at the center of the punch radiator 4 by die shank mounting plate fixing bolts 14, and the die shank 1 is installed in the center positioning hole of the die shank mounting plate 2 by die shank mounting bolts 13, so that the axial center line of the die shank 1 coincides with that of the punch 5. The punch radiator fan 4 is installed on the front side end face of the punch aluminum radiator 3. The above structures are connected to form an integral upper die.

[0023] Figure 1-6 As shown, the concave mold 9 is connected to the concave mold aluminum heat sink 11 as a whole by heat sink mounting bolts 15. The contact surfaces between them are uniformly coated with high-temperature resistant thermally conductive adhesive. The heat dissipation fins of the concave mold aluminum heat sink 11 face downwards, and the concave mold heat sink fan 10 is installed on the front side end face of the concave mold aluminum heat sink 11. The above structure is connected to form an integral lower mold.

[0024] Figure 1 , 2 As shown, the punch cooling fan 4 and the die cooling fan 10 are respectively composed of a fan mounting frame and a miniature axial flow fan 12. The fan mounting frame is rectangular, and the length of the fan mounting frame matches the length of the punch radiator 3 and the die radiator 11. Multiple miniature axial flow fans 12 are arranged and fixed in sequence in the fan mounting frame, and the air outlets of the miniature axial flow fans 12 are opposite to the heat dissipation fins of the punch radiator 3 and the die radiator 11, respectively.

[0025] Figure 1 , 2Figure 6 shows that the four corners of the punch radiator 3, punch 5, and die 9 each have guide pin holes, and the lower ends of the four mold guide pins 6 are fixed in the guide pin holes at the four corners of the die 9. The guide pin holes at the four corners of the die 9 are threaded holes, and the lower ends of the four mold guide pins 6 are threaded and connected to the four guide holes of the die 9. The four mold guide pins 6 pass through the guide pin holes at the four corners of the punch 5 and the punch radiator 3, and the mold guide pins 6 are in sliding fit with the guide pin holes of the punch 5 and the punch radiator 3. The mold guide pins 6 connect the overall upper mold and the overall lower mold into a whole, and the overall upper mold can perform stamping and unloading operations along the mold guide pins 6.

[0026] Figure 1 , 2 As shown in Figure 6, four elastic support sleeves 8 are respectively fitted onto the four mold guide pillars 6 on the upper surface of the die 9. The lower surface of the punch 5 has upward steps at both ends, and the guide pillar holes at the four corners of the punch 5 are located on the stepped surfaces, without affecting the punch 5's stamping operation. The upper and lower ends of the four elastic support sleeves 8 are in contact with the lower and upper surfaces of the guide holes of the punch 5 and die 9, respectively. The height of the elastic support sleeves 8 ensures that the punch and die are compressed when closed, providing support for the punch 5. When the mold is not in operation, the entire upper die slides down along the mold guide pillars 6 to the upper end of the elastic support sleeves 8 for support, avoiding rigid contact between the punch 5 and die 9.

[0027] Figure 7 The experiment shows that when conducting the test, the mold handle 1 in the overall upper mold is connected to the output end of the power device 16 by thread. After adjusting the mold position, the overall lower mold and the mold frame lower plate of the mold frame 17 are locked and fixed with bolts through the mounting slots of the concave mold 9 and the concave mold aluminum heat sink 11.

[0028] The usage process of this utility model is as follows:

[0029] Step 1: Connect the mold handle 1 to the output end of the power unit 16 via a thread;

[0030] Step 2: Assemble all the components of the mold assembly into a whole and place it at the center of the lower template of the mold frame 17;

[0031] Step 3: The output end of the power unit 16 moves downward, driving the mold handle 1 to align with the center of the positioning hole of the mold handle mounting plate 2, and align with the mounting bolt hole for fastening installation;

[0032] Step 4: Secure the entire lower mold to the lower plate of the mold frame 17 through the mounting slot hole;

[0033] Step 5: The power unit 16 lifts the entire upper mold, and the mold device is in the open state;

[0034] Step 6: Connect the power supply to the miniature axial flow fan 12, and the air-cooling system of the convex and concave mold heat sinks will start working;

[0035] Step 7: Place the billet 7, which has been kept at a stable temperature of 900-950℃ (or a specific temperature), into the billet groove of the die 9;

[0036] Step 8: Press down the punch 5 under the drive of the power unit 16, and hold it under pressure for quenching according to the set pressure;

[0037] Step 9: Driven by the power unit 16, the punch 5 is lifted and unloaded, the workpiece is removed to complete one round of flat die quenching, the mold continues to cool according to the set time, and the next round of flat die quenching is repeated after the time is up.

[0038] The blank is made of 22MnB5 thermoforming material. The blank size is 300mm long × 300mm wide × 2mm thick. The heat treatment temperature is 930℃. The high-speed pressing time of the punch is 2s. The holding pressure is 1.5 tons and the holding time is 20s. The mold cooling time is 120s. After six consecutive processing, the temperature distribution of the die contact surface is 50-105℃. The martensite content of the blank is as low as 97%.

[0039] An embodiment of this utility model is as follows:

[0040] The inner diameter of the mold shank 1 is 30mm and the height is 45mm;

[0041] The mold shank mounting plate 2 is 400mm long, 100mm wide, and 20mm thick;

[0042] The length of the punch radiator 3 and the concave radiator 11 is 400mm, the width is 300mm, the length of the heat dissipation fins is 30mm, the fin spacing is 9mm, and the tip width is 2mm.

[0043] The miniature axial flow fan 12 has a model number of 40*40*20mm and a power rating of 24V.

[0044] The punch 5 has a length of 400mm, a width of 300mm, and a thickness of 50mm;

[0045] The diameter of the mold guide pillar 6 is 20mm and the height is 260mm;

[0046] The outer diameter of the elastic support sleeve 8 is 30mm, the inner diameter is 20mm, and the height is 24mm;

[0047] The length of the die 9 is 400mm, the width is 300mm, and the thickness is 30mm;

[0048] The power unit 16 is a pneumatic-hydraulic booster cylinder, with a cylinder diameter of 80mm, a tonnage of 5T, and a pneumatic pressure of 6kg / cm². 2 Total stroke 300mm.

Claims

1. A mold suitable for flat die quenching tests of hot-formed steel sheets, characterized in that: It includes a punch (5), a punch radiator (3), a punch cooling fan (4), a die (9), a die radiator (11), a die cooling fan (10), a mold guide post (6), an elastic support sleeve (8), a mold shank (1), and a mold shank mounting plate (2). The punch (5) and the punch radiator (3) are both equal rectangles, and the punch radiator (3) is fixed above the punch (5). The die (9) and the die radiator (11) are both equal rectangles, and the die radiator (11) is fixed below the die (9). The punch cooling fan (4) and the die cooling fan (10) are respectively installed on the front end faces of the punch radiator (3) and the die radiator (11). The four corners of the punch radiator (4), the punch (5), and the die (9) are... Each has a guide post hole. The lower ends of the four mold guide posts (6) are fixed in the guide post holes at the four corners of the die (9). The four elastic support sleeves (8) are respectively fitted on the four mold guide posts (6) on the upper surface of the die (9). The four mold guide posts (6) pass through the guide post holes at the four corners of the punch (5) and the punch radiator (3). The mold guide posts (6) are in sliding fit with the guide post holes of the punch (5) and the punch radiator (3). The mold shank mounting plate (2) is a rectangular plate. The two ends of the mold shank mounting plate (2) are fixedly connected to the two ends of the upper surface of the punch radiator (3). The mold shank (1) is a cylindrical body. The lower end of the mold shank (1) is fixedly connected to the center of the mold shank mounting plate (2). The cylindrical body of the mold shank (1) is connected to the lower push rod of the power device (16).

2. The mold suitable for hot-formed steel sheet flat die quenching test according to claim 1, characterized in that: The punch heat sink (3) and the die heat sink (11) are fixed to the upper surface of the punch (5) and the lower surface of the die (9) respectively by heat sink mounting bolts (15). The contact surfaces of the punch heat sink (3) and the die heat sink (11) with the punch (5) and the die (9) are uniformly coated with high temperature resistant thermal conductive adhesive. The heat dissipation fins of the punch heat sink (3) and the die heat sink (11) face the upper part of the punch heat sink (3) and the lower part of the die heat sink (11) respectively.

3. The mold suitable for flat die quenching test of hot-formed steel sheet according to claim 1, characterized in that: The punch heat dissipation fan (4) and the die heat dissipation fan (10) are respectively composed of a fan mounting frame and a miniature axial flow fan (12). The fan mounting frame is rectangular, and the length of the fan mounting frame matches the length of the punch heat sink (3) and the die heat sink (11). Multiple miniature axial flow fans (12) are arranged and fixed in the fan mounting frame in sequence. The air outlet of the miniature axial flow fan (12) is opposite to the heat dissipation fins of the punch heat sink (3) and the die heat sink (11).

4. The mold suitable for hot-formed steel sheet flat die quenching test according to claim 1, characterized in that: The guide pin holes at the four corners of the die (9) are threaded holes. The lower ends of the four mold guide pins (6) are threaded and connected to the four guide holes of the die (9). The lower surface of the punch (5) has upward steps at both ends. The guide pin holes at the four corners of the punch (5) are located on the stepped surface. The upper and lower ends of the four elastic support sleeves (8) are in contact with the lower and upper surfaces of the guide holes of the punch (5) and the die (9), respectively. The height of the elastic support sleeves (8) is less than the thickness of the blank (7).

5. The mold suitable for hot-formed steel sheet flat die quenching test according to claim 1, characterized in that: The mold shank mounting plate (2) is mounted on the upper surface of the punch radiator (3) by the mold shank mounting plate fixing bolt (14). The lower end of the cylinder of the mold shank (1) is fixedly connected to the center of the mold shank mounting plate (2) by the mold shank mounting bolt (13). The inner wall of the cylinder of the mold shank (1) has threads. The lower end push rod of the power device (16) is connected to the cylinder of the mold shank (1) by threads. The central axis of the cylinder of the mold shank (1) coincides with the central axis of the punch (5).

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