Profile grinding wheel for profiling turnout grinding vehicle and forming die and method of profile grinding wheel

Abstract

The invention discloses a profile grinding wheel for a profiling turnout grinding vehicle and a forming die and method of the profile grinding wheel. The outer circle face of a grinding wheel body of the profile grinding wheel for the profiling turnout grinding vehicle is an arc face. The profile grinding wheel forming die for the profiling turnout grinding vehicle comprises an outer frame, a split type inner frame, a bottom plate, a cover plate, a mandrel and a pressing head, the bottom plate is placed in the center of a rotating disc of a spreading machine, the split type inner frame surrounds the outer circle of the bottom plate by a circle, and the outer frame is arranged outside the split type inner frame in a sleeving mode. According to the profile grinding wheel for the profiling turnout grinding vehicle, the outer arc-shaped surface of the new grinding wheel can be directly matched with the grinding surface of a steel rail, compared with a traditional grinding wheel for the profiling turnout grinding vehicle, the procedure that the grinding wheel is matched with the steel rail is not needed, the steel rail grinding efficiency is improved, raw materials for the grinding wheel are reduced, and energy consumption is reduced; the use is simpler and more convenient. The forming mold provided by the invention can ensure that the arc-shaped surface of the profile grinding wheel is not damaged or deformed during pressing and demolding.

Description

Technical Field

[0001] The present invention relates to a profiled grinding wheel for a profiling turnout grinding vehicle, a forming die thereof, and a method therefor. Background Art

[0002] A turnout is a device for realizing the conversion of train running tracks and is an important part of a railway track. During the long-term dynamic load bearing and natural corrosion process, diseases such as damage, fatigue, and wear are inevitably generated. Rail grinding can prevent and repair rail diseases and improve the safety of train operation. However, rail grinding trains are mainly aimed at repairing a large number of rail damages on the main line. For the maintenance of turnouts, local, and small amounts of rail damages, the maintenance cost is relatively high. A profiling turnout grinding vehicle is a turnout grinding device with a profiling effect designed for the maintenance of turnouts, local, and small amounts of rails. The structure of the grinding wheel used in a traditional profiling turnout grinding vehicle (abbreviation: traditional grinding wheel) is as Figure 1 shown. The outer circumferential surface of its grinding wheel body 11 is a cylindrical surface 12. During grinding, the outer circumferential surface of the grinding wheel contacts and grinds the rail. When a newly replaced grinding wheel is used, it needs to grind a certain distance before it can form a shape matching the rail profile, and the rail profile of this section needs to be repeatedly ground to meet the requirements. Summary of the Invention

[0003] In order to overcome the above-mentioned disadvantages of the prior art, the present invention provides a profiled grinding wheel for a profiling turnout grinding vehicle, a forming die thereof, and a method therefor, aiming to solve the problem that when a newly replaced traditional grinding wheel is used, it needs to grind a certain distance before the outer circumferential surface of the grinding wheel can form a shape matching the rail profile, and the rail profile of this section needs to be repeatedly ground to meet the requirements.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A profiled grinding wheel for a profiling turnout grinding vehicle, wherein the outer circumferential surface of the grinding wheel body is an arc-shaped surface.

[0005] The present invention also provides a forming die for a profiled grinding wheel for a profiling turnout grinding vehicle, including an outer frame, a split inner frame, a bottom plate, a cover plate, a mandrel, and a pressing head. Among them: The bottom plate is placed at the center of the turntable of the spreading machine, the split inner frame surrounds the outer circle of the bottom plate for one circle, and the outer frame is sleeved outside the split inner frame.

[0006] The present invention also provides a forming method for a profiled grinding wheel for a profiling turnout grinding vehicle, including the following steps:

[0007] Step 1: Mix the materials

[0008] Weigh each component of raw materials according to the designed grinding wheel formula, add the weighed raw materials of each component to a conical mixer, the mixing volume does not exceed 50% of the mixer volume, the rotation speed is set at 20 r / min, the mixing duration is 1.5 h - 2 h, and after sieving, it is ready for use;

[0009] Step 2: Compression molding

[0010] (1) Assemble the mold: First, place the bottom plate at the center of the turntable of the spreading machine. Surround the outer circle of the bottom plate with the split inner frame, and then put the outer frame over the split inner frame. Apply pressure to the outer frame from top to bottom to make the outer frame fit tightly with the split inner frame and restrict the outward movement of the split inner frame. Then, install the hole ring of the grinding wheel onto the mold mandrel in place;

[0011] (2) Weigh the molding material compounded in Step 1 according to the designed weight, and put it into the assembled mold. After ramming and leveling, cover the mold with the cover plate and the pressing head, and perform cold pressing molding;

[0012] (3) Demold: First, take out the mandrel from bottom to top. Secondly, take out the outer frame from bottom to top. Then, take out the split inner frame from inside to outside. Finally, remove the pressing head and the cover plate in sequence to obtain the profile grinding wheel blank;

[0013] (4) Put the profile grinding wheel blank into the oven for curing, and finally cool it to room temperature in the furnace and take it out.

[0014] Compared with the prior art, the positive effects of the present invention are as follows:

[0015] The new outer circular arc surface of the profile grinding wheel for the profiling turnout grinding vehicle provided by the present invention can directly match the rail grinding surface. Compared with the grinding wheel for the traditional profiling turnout grinding vehicle, there is no need for the process of matching the grinding wheel with the rail, which improves the efficiency of rail grinding, reduces the raw materials used for the grinding wheel, reduces energy consumption, and is more convenient to use.

[0016] The present invention also provides a compression molding mold for the profile grinding wheel of the profiling turnout grinding vehicle, which can ensure that the circular arc surface of the profile grinding wheel will not be damaged or deformed during pressing and demolding. Description of the drawings

[0017] The present invention will be described by way of examples with reference to the drawings, where:

[0018] Figure 1 is the structural diagram of the grinding wheel for the traditional profiling turnout grinding vehicle;

[0019] Figure 2 is the structural diagram of the profile grinding wheel for the profiling turnout grinding vehicle of the present invention;

[0020] Figure 3 is the mold diagram of the profile grinding wheel for the profiling turnout grinding vehicle of the present invention;

[0021] Figure 4 is the top view of the inner frame of the three-piece mold of the present invention;

[0022] Figure 5Schematic diagram of the assembled mold ready for feeding of the present invention;

[0023] In the figure, the reference numerals include: outer frame 1, bottom plate 2, cover plate 3, mandrel 4, pressing head 5, split inner frame 6, grinding wheel 7, hole ring 8. Detailed implementation manner

[0024] A profiling grinding wheel for a profiling turnout grinding vehicle, the structure is as Figure 2 shown, and the outer circumferential surface of the grinding wheel body 21 is an arc-shaped surface 22.

[0025] The difference between the profiling grinding wheel and the traditional grinding wheel is that: the outer circumferential surface of the traditional grinding wheel is a cylindrical surface, and when grinding, the cylindrical surface of the grinding wheel contacts and grinds the rail. When the cylindrical surface of the grinding wheel is ground into an arc-shaped surface, it has the effect of profiling grinding; while the outer circumferential surface of the profiling grinding wheel of the present invention is an arc-shaped surface, and when grinding, the arc-shaped surface of the grinding wheel contacts and grinds the rail, directly having the effect of profiling grinding. The radius of the outer arc-shaped surface of the grinding wheel is (10 - 500) mm, and profiling grinding wheels with corresponding different outer arc-shaped surface radii can be selected according to different rail (main line, turnout, frog) parts to be ground, so that the outer arc-shaped surface of the grinding wheel body directly matches the rail profile.

[0026] Since the outer circumferential surface of the profiling grinding wheel is an arc-shaped surface, if the traditional vertical demoulding from top to bottom is carried out for the grinding wheel, the arc-shaped surface of the outer circumferential surface of the grinding wheel will surely be damaged and deformed. To solve the problem of the profiling grinding wheel forming for the profiling turnout grinding vehicle, the present invention also provides a set of profiling grinding wheel compression molding die, as Figure 3 shown, the die includes: outer frame 1, bottom plate 2, cover plate 3, mandrel 4, pressing head 5, split inner frame 6. The split inner frame 6 is composed of multiple petal-shaped inner frames combined, and the number of petals ≥ 2 is acceptable. The number of petals of the inner frame can be changed according to the complexity of the shape of the outer circumferential surface of the grinding wheel. The more complex and difficult to demould the shape of the outer circumferential surface of the grinding wheel is, the more petals the inner frame has; the shape of the inner circumferential surface of the split inner frame is designed to match the shape of the outer circumferential surface of the grinding wheel, and the outer circle is designed with a slope, and the outer diameter of the inner frame is smaller at the top and larger at the bottom. The inner slope of the outer frame is the same as the outer slope of the split inner frame. Figure 4 It is a top view of the split inner frame with three petals.

[0027] The preparation process of the profiling grinding wheel for the profiling turnout grinding vehicle of the present invention is: mixing and compounding - compression molding - curing. The detailed steps are as follows:

[0028] Step 1. Mixing and compounding

[0029] Weigh each component of raw materials according to the designed formula, add the weighed raw materials of each component into a conical mixer, the mixing volume does not exceed 50% of the mixer volume, the rotation speed is set at 20 r / min, the mixing duration is (1.5 - 2) h, and it is used after sieving.

[0030] Step 2: Compression Molding

[0031] (1) Assemble the mold (take the three - petal inner frame mold as an example). First, place the bottom plate 2 at the center of the turntable of the spreading machine. Surround the outer circle of the bottom plate with the three - petal inner frame 6, and put the outer frame 1 over the split inner frame 6. Apply pressure to the outer frame 1 from top to bottom to make the outer frame fit tightly with the split inner frame and restrict the outward movement of the split inner frame. Install the hole ring 8 of the grinding wheel 7 and the mold core shaft 4 in place. The assembled mold ready for feeding is as Figure 5 shown.

[0032] (2) Weigh the molding material according to the designed weight and put it into the assembled mold. After ramming and leveling, cover the cover plate 3 and the pressure head 5, and perform cold pressing. The pressure per unit area during pressing is 18 MPa, the pressure relief interval is 2 min, and repeat 4 times. After the gas inside the molding material is discharged, keep the pressure for 10 min.

[0033] (3) When demolding, first take out the core shaft 4 from bottom to top, then take out the outer frame 1 from bottom to top, then take out the three - petal inner frame 6 from inside to outside, and finally remove the pressure head 5 and the cover plate 3 in sequence to obtain the profiled grinding wheel blank.

[0034] (4) Put the profiled grinding wheel blank into the oven for curing. The curing procedure is as follows: 90 - 100 °C, keep warm for 4 h; 120 - 130 °C, keep warm for 2 h; 140 - 150 °C, keep warm for 2 h; 160 - 170 °C, keep warm for 2 h; 180 - 190 °C, keep warm for 5 h; finally, cool it in the furnace to room temperature and take it out.

[0035] Grinding Test:

[0036] Both the grinding wheel of the traditional profiling turnout grinding vehicle and the profiled grinding wheel are subjected to grinding tests using the rail grinding and grinding experimental system. The grinding power is: 12 kw; the operation speed is: 2.5 km / h; the grinding wheel speed is: 2700 r / min.

[0037] The results of the comparative test are shown in Table 1.

[0038] Table 1

[0039]

[0040] It can be seen from Table 1 that the profile grinding wheel saves material compared with the traditional grinding wheel, with the saving rate being (6.57 - 6.37) / 6.57 = 3%; the effective service life of the profile grinding wheel is the same as that of the traditional grinding wheel (2989 / 2991 = 99.9%), taking 2990 m; when grinding 2990 rails, the time taken by the profile grinding wheel is 72 / 77 = 93.5% of that taken by the traditional grinding wheel, that is, the grinding efficiency of the profile grinding wheel is 6.5% higher than that of the traditional grinding wheel; when grinding 2990 rails, the power consumption of the profile grinding wheel is 14.3 / 15.5 = 92.3% of that of the traditional grinding wheel, that is, the energy consumption of the profile grinding wheel is 7.7% less than that of the traditional grinding wheel.

Claims

1. A profiling grinding wheel for a profiling turnout grinding vehicle, characterized in that: The outer circular surface of the grinding wheel body is an arc-shaped surface.

2. The profile grinding wheel for a profiling turnout grinding vehicle according to claim 1, characterized in that: The radius of the arc-shaped surface is 10 mm - 500 mm.

3. A profiling grinding wheel forming die for a profiling turnout grinding vehicle according to claim 1, characterized in that: It includes an outer frame, a split inner frame, a bottom plate, a cover plate, a mandrel and a pressing head, where: the bottom plate is placed at the center of the turntable of the spreading machine, the split inner frame surrounds the outer circle of the bottom plate, and the outer frame is sleeved outside the split inner frame.

4. The profiling grinding wheel forming die for a profiling turnout grinding vehicle according to claim 3, characterized in that: The split inner frame is composed of a tile-shaped inner frame combination with the number of petals ≥ 2.

5. The profiling grinding wheel forming die for the profiling turnout grinding vehicle according to claim 3, wherein: The shape of the inner circular surface of the split inner frame matches the shape of the outer circular surface of the grinding wheel body.

6. The profiling grinding wheel forming die for the profiling turnout grinding vehicle according to claim 3, wherein: The outer circle of the split inner frame has a slope, with the outer diameter being smaller at the top and larger at the bottom.

7. The profiling grinding wheel forming die for the profiling turnout grinding vehicle according to claim 3, characterized in that: The inner circular slope of the outer frame is the same as the outer circular slope of the split inner frame.

8. A forming method of a profiled grinding wheel for a profiling turnout grinding vehicle according to claim 3, characterized in that: It includes the following steps: Step 1: Mix the ingredients Weigh the raw materials of each component according to the designed grinding wheel formula, add the weighed raw materials of each component to a conical mixer, with the mixing volume not exceeding 50% of the mixer volume, the rotation speed set at 20 r / min, the mixing duration being 1.5 h - 2 h, and use it after sieving; Step 2: Compression molding (1) Assemble the mold: First, place the bottom plate at the center of the turntable of the spreading machine, surround the outer circle of the bottom plate with the split inner frame, sleeve the outer frame outside the split inner frame, and apply pressure to the outer frame from top to bottom to make the outer frame closely fit with the split inner frame and restrict the split inner frame from moving outwards; then install the hole ring of the grinding wheel and the mold mandrel in place; (2) Weigh the molded material prepared in Step 1 according to the designed weight, put it into the assembled mold, ram the material, level it, cover the cover plate and the pressing head, and perform cold pressing molding; (3) Demold: First, take out the mandrel from bottom to top, then take out the outer frame from bottom to top, then take out the split inner frame from inside to outside, and finally remove the pressing head and the cover plate in sequence to obtain the profiled grinding wheel blank; (4) Put the profiled grinding wheel blank into an oven for curing, and finally cool it in the furnace to room temperature and take it out.

9. The forming method of the profiled grinding wheel for the profiling turnout grinding vehicle according to claim 8, characterized in that: During cold pressing molding, the pressure per unit area during pressing is 18 MPa, the pressure relief interval is 2 min, and it is repeated 4 times. After the gas inside the molded material is discharged, keep the pressure for 10 min.

10. The forming method of the profiled grinding wheel for the profiling turnout grinding vehicle according to claim 8, characterized in that: The curing procedure is: 90 - 100 °C, keep warm for 4 h; 120 - 130 °C, keep warm for 2 h; 140 - 150 °C, keep warm for 2 h; 160 - 170 °C, keep warm for 2 h; 180 - 190 °C, keep warm for 5 h.

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