Double-rib induction hardening device for steel track shoe

Abstract

The invention discloses a double-rib induction quenching device for a steel track shoe. The double-rib induction quenching device comprises a medium-frequency inductor and a positioning device, the medium-frequency inductor comprises a water sprayer, an induction coil, a magnetizer, a fixing plate, a flow guide plate, an insulating plate, an insulating spacer, an insulating sleeve, a circulating water connector and a spraying water connector. The induction coil and the circulating water interface are fixed on the guide plate; the magnetizer is mounted on the induction coil; the fixed plate is fixed on the induction coil; a spraying water connector is arranged on the side wall of the water sprayer; the two circulating water interfaces are connected with the cavity of the induction coil and are used for introducing circulating water into the induction coil for cooling; the water sprayer is fixedly mounted on the fixing plate; and the positioning device is arranged close to an induction coil of the medium-frequency inductor and is used for positioning the steel track shoe. The method has a good effect on strengthening the landing ribs of the medium-carbon alloy steel track shoe with long and short arc-shaped ribs distributed in a staggered manner, and has the characteristics of high processing efficiency, good quality consistency, low labor intensity, low production cost and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of induction heat treatment devices, and in particular relates to a double-reinforcement induction quenching device for a steel track shoe. Background Art

[0002] Crawler-type walking mechanisms have significant advantages such as low ground contact pressure, good adhesion performance, high traction efficiency, simple structure and convenient control. The tracks transmit the ground's traction, adhesion and braking force to the vehicle body, providing a continuous rolling track for the road wheels, greatly improving the vehicle's maneuverability and passability on soft and rugged terrain. The track shoe is a key component where the operating machinery contacts the ground. It plays a role in transmitting the interaction force and torque between the machinery and the ground. Its structural form directly affects the traction capacity. When working, the track shoe is in direct contact with the road surface, bearing the weight of the entire machine, traction and friction with the road surface. It is subjected to complex stresses such as impact, stretching, extrusion and bending. During use, it is very easy to cause excessive wear, deformation, etc. and fail. Therefore, the substrate of the track shoe is required to have good strength and toughness, and the ground reinforcement has high wear resistance.

[0003] Cast track shoes are commonly made of high-manganese steels such as ZGMn13. Through water toughening, high-manganese steels can achieve a single austenitic structure, while their surface structure easily undergoes phase transformation to martensite under strong impact or extrusion forces, giving high-manganese steels good core plastic toughness, low crack propagation, and surface wear resistance. Forged track shoes are commonly made of medium- and low-carbon alloy steels such as 20CrMnSiNi2A, 30SiMnMoVTi, and 42CrMoA. Low-carbon alloy steel track shoes like 20CrMnSiNi2A are strengthened through overall quenching and low-temperature tempering, while medium-carbon alloy steel track shoes like 30SiMnMoVTi and 42CrMoA are strengthened through overall quenching, medium- and high-temperature tempering, and localized induction heat treatment. Low-carbon alloy steel track shoes have a low carbon content and a hardness of about 45HRC after quenching and low-temperature tempering. They have poor wear resistance on gravel roads and are not suitable for harsh road conditions. Medium-carbon alloy steel track shoes can be adjusted to a medium hardness range with good strength and toughness through heat treatment system adjustments. The ground reinforcement has high wear resistance, making them the best choice for heavy loads and harsh road conditions.

[0004] Medium-carbon alloy steel track shoes used in heavy loads and harsh road conditions typically feature a staggered arrangement of long and short arc-shaped bars to enhance grip. To ensure the track shoe's service life and quality stability, the bar hardening depth must be kept within a reasonable range. A certain type of 42CrMo(Nb)A steel track shoe requires a bar hardening depth of 8-10mm and a hardness of 55HRC or higher. To achieve this, single-bar scanning induction hardening is typically used. This method effectively guarantees a deep hardening depth, but it also results in lower production efficiency. Due to the inconsistent shape and structure of the bar, double-bar induction hardening makes it difficult to achieve these technical requirements. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a double-rib induction quenching device for steel track shoes with simple structure, high degree of automation, high processing efficiency and good consistency of hardened layer depth.

[0006] The technical solution adopted by the present invention is: a double-reinforcement induction quenching device for a steel track shoe, comprising a medium frequency sensor and a positioning device; the medium frequency sensor comprises a water sprinkler, an induction coil, a magnetizer, a fixed plate, a guide plate, an insulating plate, an insulating gasket, an insulating sleeve, a circulating water interface, and a spray water interface; the induction coil and the circulating water interface are fixed on the guide plate; an insulating plate is fixed in the middle gap of the guide plate; the magnetizer is installed on the induction coil; the fixing bolt A is welded on the induction coil, and the fixing plate is fixed by the fixing bolt A and the nut A; a spray water interface is provided on the side wall of the water sprinkler; two circulating water interfaces are connected to the cavity of the induction coil, for circulating water in the induction coil for cooling; the water sprinkler is fixedly mounted on the fixed plate; the positioning device is arranged close to the induction coil of the medium frequency sensor, for positioning the steel track shoe.

[0007] Furthermore, the positioning device includes a base, a round pin and a prismatic pin; the round pin and the prismatic pin are fixed on the base; the round pin and the prismatic pin are arranged perpendicular to the base.

[0008] Furthermore, the material of the sprinkler, induction coil and guide plate is T2 copper, and the material of the circulating water interface and the spray water interface is H62 brass.

[0009] Furthermore, the insulating plate is made of polytetrafluoroethylene, and the insulating plate is fixedly installed in the middle gap of the flow plate by fixing bolts C and fixing nuts C; an insulating sleeve is provided on the outside of the fixing bolt C, and an insulating gasket is provided between the bolt head of the fixing bolt C and the insulating plate and between the fixing nut C and the insulating plate respectively; the material of the insulating sleeve and the insulating gasket is bakelite.

[0010] Furthermore, the base, the round pin and the prismatic pin are all made of 3Cr13 with a hardness of 47-52HRC.

[0011] Furthermore, the magnetizer is Fluxtrol 50 high-density ferrite, with a single piece size of 42×24 mm and a 16 mm groove processed in the middle. Two pieces are in a group, and three groups of magnetizers are evenly clamped to the induction coil. The lateral spacing between the magnetizers is 40.5~41 mm.

[0012] Furthermore, a 42×15 mm recessed section is provided in the middle of the induction coil, and a group of magnetic conductors in the middle are snapped into the recessed section of the induction coil. The horizontal height of the magnetic conductors in the recessed section is 15 mm lower than that of the magnetic conductors on both sides thereof.

[0013] Furthermore, the sprinkler is provided with water spray holes with a horizontal and vertical spacing of 5 mm and a diameter of Φ1.5 mm. The angle of the water spray holes is 30° downward from the vertical horizontal plane. The water spray holes of the sprinkler are distributed in 3 areas, and the 3 areas are respectively located directly below the three groups of magnetic conductors. The water spray holes in a single area are arranged in 10 rows × 10 columns.

[0014] Furthermore, two spray water interfaces are welded on the side wall of the sprinkler.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has good versatility and can be used for induction hardening of one-piece 8-rib track shoes and split 4-rib track shoes.

[0016] 2. The high and low position layout of the magnetic conductor and the smooth milling of the grounding bar of the present invention are conducive to the maximum simultaneous heating and cooling of the grounding bar. The depth of the hardened layer of the grounding bar after quenching is consistent and can be stably controlled within the range of 8~9mm or 9~10mm.

[0017] 4. The sprinkler of the present invention adopts a double water inlet design, with a large spray volume and a constant flow rate. After the ground reinforcement is induction heated, the sprinkler fully covers the ground reinforcement without dead angles. After low-temperature tempering, the hardness can be stabilized at 55~57HRC.

[0018] 5. The positioning devices of the present invention are all made of stainless steel with high hardness. They will not deform or rust after long-term use and have high operating accuracy. The sensor design is compact and rigid, and is beautiful and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the present invention.

[0020] Figure 2 It is a top view of the present invention.

[0021] Figure 3 It is a front view of the intermediate frequency sensor of the present invention.

[0022] Figure 4 FIG. 4 is a top view of the intermediate frequency sensor of the present invention.

[0023] Figure 5 It is a top view of the positioning device of the present invention.

[0024] Figure 6 This is a structural diagram of the 42CrMoNbA steel one-piece track shoe.

[0025] Figure 7 This is a structural diagram of a 42CrMoA steel single-piece track shoe.

[0026] Figure 8This is the crystal phase diagram of the 42CrMoA steel single track shoe reinforcement before induction quenching.

[0027] Figure 9 This is the crystal phase diagram of the 42CrMoA steel single track shoe reinforcement after induction quenching.

[0028] In the figure: 1. deflector; 2. induction coil; 3. magnetic conductor; 4. sprinkler; 5. fixing plate; 6. circulating water interface; 7. fixing bolt C; 8. nut C; 9. fixing bolt B; 10. nut B; 11. fixing bolt A; 12. nut A; 13. spray water interface; 14. insulating gasket; 15. insulating sleeve; 16. insulating plate; 17. base; 18. round pin; 19. prismatic pin; 20. hexagon socket bolt. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1-5 As shown, the present invention includes an intermediate frequency sensor I and a positioning device II; the intermediate frequency sensor I includes a sprinkler 4, an induction coil 2, a magnetic conductor 3, a fixing plate 5, a guide plate 1, an insulating plate 16, an insulating gasket 14, an insulating sleeve 15, a circulating water interface 6, and a spray water interface 13. The sprinkler 4, induction coil 2, and guide plate 1 are made of T2 copper, while the circulating water interface 6 and the spray water interface 13 are made of H62 brass.

[0031] The induction coil 2 and circulating water port 6 are fixed to the guide plate 1. An insulating plate 16 is fixed in the central gap of the guide plate 1. The insulating plate 16 is made of polytetrafluoroethylene. The insulating plate 16 is secured to the central gap of the guide plate 1 by fixing bolts C7 and nuts C8. An insulating sleeve 15 covers the outer side of the fixing bolts C7. An insulating gasket 14 is placed between the bolt head of the fixing bolt C7 and the insulating plate 16, and between the fixing nut C8 and the insulating plate 16. The insulating sleeve 15 and insulating gasket 14 are made of bakelite.

[0032] The magnetizers 3 are Fluxtrol 50 high-density ferrite, each measuring 42 x 24 mm with a 16 mm groove cut into the center. They are arranged in groups of two, one above the other. Three groups of magnetizers 3 are evenly secured to the induction coil 2 using adhesive. The effective working dimensions of a single area are 42 x 52 mm, with the magnetizers 3 spaced 40.5 to 41 mm apart. A 42 x 15 mm recessed section is provided in the center of the induction coil 2. The center group of magnetizers 3 is snapped into this recessed section, with the height of the magnetizers 3 in this recess 15 mm lower than the adjacent magnetizers 3.

[0033] The fixing bolt A11 is welded to the induction coil 2, and the fixing plate 5 is fixed by the fixing bolt A11 and the nut A12. Two spray water interfaces 13 are provided on the side wall of the sprinkler 4. A heater and a cooler are provided in the sprinkler 4 to control the temperature of the spray liquid. Two circulating water interfaces 6 are connected to the cavity of the induction coil 2 to circulate water in the induction coil 2 for cooling. The sprinkler 4 is fixed on the fixing plate 5 by fixing bolts B9 and nuts B10. The sprinkler 4 is provided with water spray holes with a horizontal and vertical spacing of 5 mm and a diameter of Φ1.5 mm. The angle of the water spray holes is 30° downward from the vertical horizontal plane. The water spray holes of the sprinkler 4 are distributed in 3 areas. The 3 areas are respectively located directly below the three groups of magnetizers 3. The water spray holes in a single area are arranged in 10 rows × 10 columns.

[0034] Positioning device II is located near the induction coil 2 of the medium-frequency inductor and is used to position the steel track shoe. The positioning device comprises a base 17, a round pin 18, and a prismatic pin 19. The round pin 18 and prismatic pin 19 are each secured to the base 17 via multiple hexagon socket head bolts 20. The round pin 18 and prismatic pin 19 are positioned perpendicular to the base 17. The base 17, round pin 18, and prismatic pin 19 are all made of 3Cr13 with a hardness of 47-52 HRC.

[0035] The present invention is used for 42CrMoNbA steel one-piece crawler plate (its structure is as follows Figure 6 When quenching the ground reinforcement (as shown), the specific operations are as follows: Step 1: Insert the round pin and the prismatic pin into the two pin holes of the machined 42CrMoNbA steel one-piece track shoe to fix it.

[0036] Step 2: Adjust the base angle so that the track shoe rib surface is parallel to the working surface of the intermediate frequency sensor magnet. Adjust the gap between the track shoe rib surface and the intermediate frequency sensor magnet to 4 ± 0.3 mm. Set the heating power to 58 kW. This step is only for the first part in the same machining batch and is not required for subsequent parts.

[0037] Step 3: Select the inner and middle working areas of the medium frequency sensor so that the magnetizer and sprinkler can completely cover the width of the ground bar.

[0038] Step 4: Turn on the sprinkler 4 and raise the intermediate frequency sensor position until the sprinkler can spray the pin shaft hole in the middle section of the track shoe. After staying for 1 second, move it to the bottom of the track shoe at a constant speed to make the surface of the track shoe grounding bar and the pin shaft hole wet.

[0039] Step 5: Start heating from the bottom of the ground bar. The starting heating position of the medium frequency sensor is the bottom surface of the upper magnetic conductor in a group of magnetic conductors 3 in the concave section. After fixed heating for 4 seconds, scan upward at a speed of 330mm / min for heating. After the first section of long and short bars are fully heated, stop heating immediately and quickly raise the medium frequency sensor 35mm so that the spray liquid can completely cover the heated ground bars on both sides. The spraying time is 8S.

[0040] Step 6: Raise the medium frequency sensor to 40mm above the second section of the ground bar to be heated and spray it, so that the surface of the lower ground bar and the pin shaft hole are in a wet state. After staying for 1 second, move downward at a uniform speed until the magnet is 15mm beyond the lowermost ground bar of the second section (the magnet does not sense the first section of the ground bar). After fixed heating for 4 seconds, scan upward at a speed of 330mm / min to heat. After the long and short bars of the second section are fully heated, stop heating immediately and quickly raise the medium frequency sensor 35mm so that the spray liquid can completely cover the heated ground bars on both sides. The spraying time is 8S.

[0041] Step 7: Move the intermediate frequency sensor horizontally and select the middle and outer working areas of the intermediate frequency sensor so that the magnetizer and sprinkler can completely cover the width of the ground bar.

[0042] Step 8: Raise the medium frequency sensor to the position where the sprinkler can spray the pin shaft hole at the upper end of the track shoe. After staying for 1 second, move it to the bottom of the track shoe at a constant speed to make the surface where the track shoe ground bar and the pin shaft hole are wet.

[0043] Step 9: Start heating from the third section of ground reinforcement. The starting heating position of the medium frequency sensor is the bottom surface of the upper magnet in a group of magnets 3 in the concave section (the magnet does not sense the second section of ground reinforcement). After fixed heating for 4 seconds, scan upward at a speed of 330mm / min for heating. After all the long and short reinforcements in the third section are heated, stop heating immediately and quickly raise the medium frequency sensor 35mm so that the spray liquid can completely cover the heated ground reinforcements on both sides. The spraying time is 8S.

[0044] Step 10: Raise the medium frequency sensor to 40mm above the fourth section of grounding bar to be heated and spray, so that the surface of the lower grounding bar and the pin shaft hole are in a moist state. After staying for 1 second, move downward at a uniform speed until the magnet is 15mm beyond the lowest grounding bar of the fourth section (the magnet does not sense the third section of grounding bar). After fixed heating for 4 seconds, scan upward and heat at a speed of 330mm / min. After the long and short bars of the fourth section are fully heated, stop heating immediately and quickly raise the medium frequency sensor 35mm so that the spray liquid can completely cover the heated grounding bars on both sides. The spraying time is 30S.

[0045] Step 11: The induction hardened track shoe is transferred to a box / pit type resistance furnace for tempering within 4 hours. The tempering temperature is 150±10℃, the holding time is 120~180min, and air cooling or furnace cooling is used.

[0046] The present invention is used for 42CrMoA steel single track shoe (its structure is as follows Figure 7 When quenching the ground reinforcement (as shown), the specific operations are as follows: Step 1: Insert the round pin and the prismatic pin into the two pin holes of the machined 42CrMoA steel single track shoe A or single track shoe B to fix it.

[0047] Step 2: Adjust the base angle so that the track shoe rib surface is parallel to the working surface of the intermediate frequency sensor magnet. Adjust the gap between the track shoe rib surface and the intermediate frequency sensor magnet to 4 ± 0.3 mm. Set the heating power to 58 kW. This step is only for the first part in the same machining batch and is not required for subsequent parts.

[0048] Step 3: For single track shoe A, select the inner and middle working areas of the medium frequency sensor; for single track shoe B, select the middle and outer working areas of the medium frequency sensor so that the magnetizer and water sprayer can completely cover the width of the rib.

[0049] Step 4: Turn on the sprinkler 4 to spray, raise the position of the medium frequency sensor until the sprinkler can spray the pin shaft hole on the upper end surface of the track shoe, stay for 1 second and then move it to the bottom of the track shoe at a constant speed to make the surface where the track shoe ground bar and the pin shaft hole are in a wet state.

[0050] Step 5: Start heating from the bottom of the ground reinforcement. The starting heating position of the medium frequency inductor is that the upper side of the middle area is flush with the bottom surface. After fixed heating for 4 seconds, scan upward at a speed of 330mm / min for heating. After the first section of long and short reinforcements are fully heated, stop heating immediately and quickly raise the medium frequency inductor 35mm so that the spray liquid can completely cover the heated ground reinforcements on both sides. The spraying time is 8S.

[0051] Step 6: Raise the medium frequency sensor to 40mm above the second section of the ground bar to be heated and spray it, so that the surface of the lower ground bar and the pin shaft hole are in a wet state. After staying for 1 second, move it downward at a uniform speed until the magnet is 15mm beyond the lowermost ground bar of the second section (the magnet does not sense the first section of the ground bar). After fixed heating for 4 seconds, scan upward at a speed of 330mm / min to heat. After the long and short bars of the second section are fully heated, stop heating immediately and quickly raise the medium frequency sensor 35mm so that the spray liquid can completely cover the heated ground bars on both sides. The spraying time is 30S.

[0052] Step 7: The induction hardened track shoe is transferred to a box-type / pit-type resistance furnace for tempering within 4 hours. The tempering temperature is 150±10℃, the holding time is 120~180min, and air cooling or furnace cooling is used. Figure 8-9 As shown in FIG. 3 , the grains after the heat treatment of the present invention are obviously finer and denser.

Claims

1. A double-rib induction quenching device for steel track shoes, characterized in that: The invention comprises an intermediate frequency sensor and a positioning device; the intermediate frequency sensor comprises a water sprayer (4), an induction coil (2), a magnetic conductor (3), a fixing plate (5), a guide plate (1), an insulating plate (16), an insulating gasket (14), an insulating sleeve (15), a circulating water interface (6), and a spray water interface (13); the induction coil (2) and the circulating water interface (6) are fixed on the guide plate (1); an insulating plate (16) is fixedly installed in the middle gap of the guide plate (1); the magnetic conductor (3) is installed on the induction coil ( 2); a fixing bolt A (11) is welded to the induction coil (2); the fixing plate (5) is fixed by the fixing bolt A (11) and the nut A (12); a spray water interface (13) is provided on the side wall of the sprinkler (4); two circulating water interfaces (6) are connected to the cavity of the induction coil (2) and are used to pass circulating water in the induction coil (2) for cooling; the sprinkler (4) is fixedly mounted on the fixing plate (5); a positioning device is provided near the induction coil (2) of the medium frequency sensor and is used to position the steel track shoe.

2. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The positioning device comprises a base (17), a round pin shaft (18) and a prismatic pin shaft (19); the round pin shaft (18) and the prismatic pin shaft (19) are fixed on the base (17); and the round pin shaft (18) and the prismatic pin shaft (19) are arranged perpendicular to the base (17).

3. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The material of the sprinkler (4), the induction coil (2) and the guide plate (1) is T2 copper, and the material of the circulating water interface (6) and the spray water interface (13) is H62 brass.

4. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The insulating plate (16) is made of polytetrafluoroethylene and is fixedly mounted in the middle gap of the flow plate (1) by means of a fixing bolt C (7) and a fixing nut C (8); an insulating sleeve (15) is sleeved on the outer side of the fixing bolt C (7); an insulating gasket (14) is respectively arranged between the bolt head of the fixing bolt C (7) and the insulating plate (16) and between the fixing nut C (8) and the insulating plate (16); the insulating sleeve (15) and the insulating gasket (14) are made of bakelite.

5. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The base (17), the round pin (18) and the prismatic pin (19) are all made of 3Cr13 with a hardness of 47-52HRC.

6. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The magnetizer (3) is a Fluxtrol 50 type high-density ferrite, with a single piece size of 42×24 mm and a 16 mm groove processed in the middle. Two pieces are in a group, and three groups of magnetizers (3) are evenly clamped on the induction coil (2). The lateral spacing of the magnetizers (3) is 40.5-41 mm.

7. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: A 42×15 mm recessed section is provided in the middle of the induction coil (2); a group of magnetizers (3) in the middle are snapped into the recessed section of the induction coil (2); and the horizontal height of the magnetizers (3) in the recessed section is 15 mm lower than that of the magnetizers (3) on both sides thereof.

8. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: The water sprayer (4) is provided with water spray holes with a horizontal spacing and a vertical spacing of 5 mm and a diameter of Φ1.5 mm. The angle of the water spray holes is 30° downward from the vertical horizontal plane. The water spray holes of the water sprayer (4) are distributed in three areas. The three areas are respectively located directly below the three groups of magnetic conductors (3). The water spray holes in a single area are arranged in 10 rows×10 columns.

9. The double-rib induction hardening device for steel track shoes according to claim 1, characterized in that: Two spray water interfaces (13) are welded on the side wall of the sprinkler (4).

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