A profiled grinding wheel for a profiled turnout grinding vehicle and a forming die thereof

Abstract

This utility model discloses a profile grinding wheel for a contour-following turnout grinding vehicle and its forming mold. The profile-following turnout grinding wheel has an outer arc-shaped surface. The forming mold includes an outer frame, a segmented inner frame, a base plate, a cover plate, a mandrel, and a pressure head. The base plate is placed at the center of the turntable of the spreader, the segmented inner frame surrounds the outer circle of the base plate, and the outer frame fits over the segmented inner frame. The new arc-shaped outer surface of the profile-following turnout grinding wheel provided by this utility model can directly match the grinding surface of the rail. Compared with traditional profile-following turnout grinding wheels, it eliminates the need for a wheel-rail matching process, improving the efficiency of rail grinding, reducing raw material consumption, reducing energy consumption, and simplifying use. The forming mold provided by this utility model ensures that the arc-shaped surface of the profile-following grinding wheel is not damaged or deformed during pressing and demolding.

Description

Technical Field

[0001] This utility model relates to a profile grinding wheel for a contour turnout grinding vehicle and its forming mold. Background Technology

[0002] Turnouts are devices that enable train track switching and are an important component of railway tracks. During long-term dynamic load-bearing and natural corrosion, they inevitably suffer damage, fatigue, and wear. Rail grinding can prevent and repair rail defects, improving train safety. However, rail grinding trains are mainly designed for repairing large amounts of rail damage on main lines; repairing turnouts, localized damage, or minor rail damage is costly. Contour turnout grinding machines are designed for turnout maintenance, providing a contour-based grinding effect. The structure of the grinding wheel (referred to as: traditional grinding wheel) used in traditional contour turnout grinding machines is as follows... Figure 1 As shown, the outer surface of the grinding wheel body 11 is a cylindrical surface 12. During grinding, the outer surface of the grinding wheel contacts and grinds the rail. When a new grinding wheel is used, it needs to be ground for a certain distance before it can form a shape that matches the profile of the rail. The profile of the rail for this distance needs to be ground repeatedly to meet the requirements. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings of the prior art, this utility model proposes a profile grinding wheel for a turnout grinding vehicle and its forming mold, which aims to solve the problem that when a new grinding wheel is used, it is necessary to grind a certain distance before the outer surface of the grinding wheel can form a shape that matches the profile of the rail, and the rail profile of this distance needs to be repeatedly ground to achieve the required shape.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a profile grinding wheel for a contour turnout grinding vehicle, wherein the outer circular surface of the grinding wheel body is an arc-shaped surface.

[0005] This utility model also provides a profile grinding wheel forming mold for a contour turnout grinding vehicle, including an outer frame, a segmented inner frame, a base plate, a cover plate, a mandrel, and a pressure head, wherein: the base plate is placed at the center of the turntable of the spreader, the segmented inner frame surrounds the outer circle of the base plate, and the outer frame is fitted over the segmented inner frame.

[0006] Compared with the prior art, the positive effects of this utility model are:

[0007] The new profile grinding wheel for track turnout grinding vehicles provided by this utility model has an outer arc-shaped surface that can be directly matched with the grinding surface of the rail. Compared with the traditional grinding wheel for track turnout grinding vehicles, 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 easier to use.

[0008] This utility model also provides a pressing mold for a profile grinding wheel for a contour turnout grinding vehicle, which can ensure that the arc surface of the profile grinding wheel will not be damaged or deformed during pressing and demolding. Attached Figure Description

[0009] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0010] Figure 1 A structural diagram of a grinding wheel used in a traditional contour turnout grinding machine;

[0011] Figure 2 This is a structural diagram of the profile grinding wheel for the contour turnout grinding vehicle of this utility model;

[0012] Figure 3 This is a drawing of the profile grinding wheel mold for the contour turnout grinding vehicle of this utility model;

[0013] Figure 4 This is a top view of the inner frame of the three-lobed mold of this utility model;

[0014] Figure 5 This is a schematic diagram of the assembled mold ready for feeding materials according to this utility model.

[0015] The attached diagram includes the following labels: outer frame 1, base plate 2, cover plate 3, mandrel 4, pressure head 5, split inner frame 6, grinding wheel 7, and hole ring 8. Detailed Implementation

[0016] A profile grinding wheel for a contoured turnout grinding machine, with the structure as follows: Figure 2 As shown, the outer circular surface of its grinding wheel body 21 is an arc-shaped surface 22.

[0017] The difference between profile grinding wheels and traditional grinding wheels lies in their outer surfaces. Traditional grinding wheels have cylindrical outer surfaces, which contact and grind the rail during grinding. When the cylindrical surface is ground into an arc shape, it achieves a profile grinding effect. In contrast, the profile grinding wheel of this invention has an arc-shaped outer surface, which directly contacts and grinds the rail, achieving a profile grinding effect. The radius of the outer arc surface of the grinding wheel is (10-500) mm. Different profile grinding wheels with varying outer arc radii can be selected based on the different parts of the rail (mainline, turnout, switch point) to be ground, ensuring a direct match between the outer arc surface of the grinding wheel and the rail profile.

[0018] Because the outer surface of a profile grinding wheel is an arc shape, if it is demolded vertically as in traditional grinding wheels, the arc shape of the outer surface will inevitably be damaged and deformed. To solve the problem of forming profile grinding wheels for contour-following turnout grinding vehicles, this utility model also provides a set of profile grinding wheel pressing molds, such as... Figure 3As shown, the mold includes: an outer frame 1, a base plate 2, a cover plate 3, a mandrel 4, a pressure head 5, and a segmented inner frame 6. The segmented inner frame 6 is composed of multiple tile-shaped inner frames, with a maximum of 2 lobes. The number of lobes can be adjusted according to the complexity of the outer surface shape of the grinding wheel; the more complex the outer surface shape of the grinding wheel and the more difficult it is to demold, the more lobes the inner frame should have. The inner surface design of the segmented inner frame matches the outer surface shape of the grinding wheel, and the outer circle has a slope. The outer diameter of the inner frame is smaller at the top and larger at the bottom. The slope of the inner circle of the outer frame is the same as the slope of the outer circle of the segmented inner frame. Figure 4 This is a top view of a three-lobed inner frame.

[0019] The manufacturing process of the profile grinding wheel for the contour turnout grinding vehicle of this utility model is as follows: material mixing—press molding—curing. Detailed steps are shown below:

[0020] Step 1: Mixing materials

[0021] Weigh each component raw material according to the designed formula, add the weighed raw materials to the conical mixer, the mixing volume should not exceed 50% of the mixer volume, the speed should be set to 20 r / min, the mixing time should be (1.5-2) h, and then sieve for later use.

[0022] Step 2: Pressing and Molding

[0023] (1) Assemble the mold (taking a three-lobed inner frame mold as an example). First, place the base plate 2 at the center of the spreader's turntable. Place the three-lobed inner frame 6 around the outer circle of the base plate. Fit the outer frame 1 over the lobed inner frame 6. Apply pressure to the outer frame 1 from top to bottom, ensuring a tight fit between the outer frame and the lobed inner frame, restricting outward movement of the lobed inner frame. Install the hole ring 8 of the grinding wheel 7 and the mold mandrel 4 into place. The assembled mold for feeding materials is as follows: Figure 5 As shown.

[0024] (2) Weigh the molding material according to the designed weight and put it into the assembled mold. After tamping and smoothing, cover the cover plate 3 and the pressure head 5 and perform cold pressing. Press the unit area to withstand the strength of 18MPa, release pressure at 2min interval, repeat 4 times, and hold the pressure for 10min after the gas inside the molding material is discharged.

[0025] (3) When removing the mold, first take out the mandrel 4 from bottom to top, then take out the outer frame 1 from bottom to top, then take out the three inner frame 6 from inside to outside, and finally remove the pressure head 5 and the cover plate 3 in sequence to obtain the profile grinding wheel blank.

[0026] (4) Place the profile grinding wheel blank into the oven for curing. The curing procedure is as follows: 90-100℃, keep warm for 4 hours; 120-130℃, keep warm for 2 hours; 140-150℃, keep warm for 2 hours; 160-170℃, keep warm for 2 hours; 180-190℃, keep warm for 5 hours; finally, cool it to room temperature with the oven and take it out.

[0027] Grinding test:

[0028] Both the traditional profile turnout grinding wheel and the contour grinding wheel used in the grinding test were tested using a rail grinding experimental system. The grinding power was 12 kW; the operating speed was 2.5 km / h; and the grinding wheel speed was 2700 r / min.

[0029] The results of the comparative experiment are shown in Table 1.

[0030] Table 1

[0031]

[0032] Table 1 shows that profiled grinding wheels save 3% (6.57-6.37) / 6.57 = 3% of material compared to traditional grinding wheels; the effective service life of profiled grinding wheels and traditional grinding wheels is the same (2989 / 2991 = 99.9%), taking 2990m; when completing 2990m of rail grinding, the time taken by profiled grinding wheels is 72 / 77 = 93.5% of that taken by traditional grinding wheels, meaning the grinding efficiency of profiled grinding wheels is 6.5% higher than that of traditional grinding wheels; when completing 2990m of rail grinding, the energy consumption of profiled grinding wheels is 14.3 / 15.5 = 92.3% of that of traditional grinding wheels, meaning the energy consumption of profiled grinding wheels is 7.7% lower than that of traditional grinding wheels.

Claims

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

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

3. A profile grinding wheel forming mold for a contoured turnout grinding vehicle based on the description in claim 1, characterized in that: It includes an outer frame, a split inner frame, a base plate, a cover plate, a mandrel, and a pressure head. The base plate is placed at the center of the spreader's turntable, the split inner frame surrounds the outer circle of the base plate, and the outer frame is fitted over the split inner frame.

4. The profile grinding wheel forming mold for the contour turnout grinding machine according to claim 3, characterized in that: The segmented inner frame is composed of a combination of tile-shaped inner frames with ≥2 segments.

5. The profile grinding wheel forming mold for the contour turnout grinding machine according to claim 3, characterized in that: The inner circular shape of the segmented inner frame matches the outer circular shape of the grinding wheel body.

6. The profile grinding wheel forming mold for the contour turnout grinding machine according to claim 3, characterized in that: The outer circle of the segmented inner frame has an sloping shape, and the outer diameter is smaller at the top and larger at the bottom.

7. The profile grinding wheel forming mold for the contour turnout grinding machine according to claim 3, characterized in that: The slope of the inner circle of the outer frame is the same as the slope of the outer circle of the segmented inner frame.

Images