A method for adjusting the imbalance of rail grinding wheels

Abstract

The present invention discloses a method for adjusting the imbalance of a rail grinding wheel. A high-viscosity material is used, and a curing agent and a coupling agent are added to adhere the filler weight block to the surface of the grinding wheel well, and the filler weight block is fixed by winding a wire. Finally, the filler weight block is cured to form a tightly integrated whole with the grinding wheel, so that the imbalance of the grinding wheel is significantly reduced. After the rail grinding wheel is adjusted with the filler weight according to the method of the present invention, the filler weight block is tightly integrated and does not fall off, the imbalance of the grinding wheel is significantly reduced, the vibration, noise, and motor spindle wear during the use of the grinding wheel are reduced, and the yield of the grinding wheel is improved. The present invention effectively solves the scrapping phenomenon caused by the excessive imbalance of the traditional rail grinding wheel, reduces the occurrence of hazards such as high noise, high vibration, damage to the motor spindle, impact on the grinding wheel processing accuracy, and safety risks during the use of the grinding wheel, improves the yield of the grinding wheel, and reduces the manufacturing cost of the grinding wheel.

Description

Technical Field

[0001] The invention relates to a method for adjusting the unbalance amount of a rail grinding wheel. Background Art

[0002] Rails, as core components of railways, can develop corrugation, fatigue cracks, and spalling after prolonged operation, seriously impacting the safety and comfort of train operations. With the rapid development of my country's railways, rail damage is becoming increasingly severe, and the demand for rail maintenance is also increasing.

[0003] Rail grinding is the most effective measure to maintain it. The key equipment for rail grinding is the rail grinding vehicle and its matching grinding wheel. The performance of the grinding wheel determines the effect of rail grinding.

[0004] Due to the coarse grit of rail grinding wheels and the significant difference in density between the abrasive and the binder, delamination and segregation are prone to occur during the grinding wheel forming process, resulting in significant wheel imbalance. Excessive wheel imbalance can cause high vibration and noise during use, accelerate motor spindle wear, and affect machining accuracy. In severe cases, it can lead to wheel breakage, resulting in safety accidents and endangering personnel. Grinding wheels are inspected for imbalance during production. Wheels with excessive imbalance require adjustment. For wheels with a substrate, adjustment is typically performed by drilling holes to remove weight. For wheels without a substrate and with high porosity, adjustment is typically performed by impregnation and weighting. Rail grinding wheels have a thin substrate and low porosity, making adjustment impossible using either impregnation or weighting methods. Consequently, there is currently no suitable static balance adjustment method for rail grinding wheels. Excessive static balance results in the wheels being scrapped, increasing grinding wheel costs and wasting resources. Summary of the Invention

[0005] To overcome the aforementioned shortcomings of the prior art, the present invention proposes a method for adjusting the imbalance of rail grinding wheels. This method involves impregnating glass fibers with a mixed resin solution, coating the mixed resin powder, adhering the glass fibers to the lighter side of the grinding wheel, and finally wrapping the wheel with wire for reinforcement. This method corrects the imbalance of the grinding wheel without affecting its appearance or strength, thereby improving the yield rate of the grinding wheel.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for adjusting the unbalance of a rail grinding wheel, comprising the following steps:

[0007] Step 1: Prepare mixed resin liquid:

[0008] Mix 10-17 parts of resin liquid and 1-2 parts of coupling agent according to mass ratio to obtain a mixed resin liquid;

[0009] Step 2: Prepare mixed resin powder:

[0010] Mix 10-15 parts of resin powder and 1-2 parts of curing agent according to mass ratio to obtain mixed resin powder;

[0011] Step 3: Wetting the glass fiber:

[0012] Place the glass fiber in the mixed resin solution prepared in step 1 and soak it for 2 to 4 hours;

[0013] Step 4: Prepare the mixture:

[0014] Mix 10-15 parts of the mixed resin liquid prepared in step 1 and 20-30 parts of the mixed resin powder prepared in step 2 according to a mass ratio to obtain a mixture;

[0015] Step 5: Add weight:

[0016] Weigh 10-15 parts of the mixture prepared in step 4 and 1-2 parts of the glass fiber soaked in step 3 according to the mass ratio, then apply the mixture to the surface of the glass fiber to obtain a filler weight, and then place the filler weight close to the side of the grinding wheel with lighter static imbalance;

[0017] Step 6: Reinforcement with silk wrapping:

[0018] Use a winding machine to evenly wind the glass fiber soaked in step 3 on the surface of the grinding wheel in 8 to 10 layers;

[0019] Step 7: Curing:

[0020] The wire-reinforced grinding wheel is placed in a curing oven for curing.

[0021] Compared with the prior art, the present invention has the following positive effects:

[0022] The present invention provides a method for adjusting the imbalance of a rail grinding wheel. The method adopts a high-viscosity material, adds a curing agent and a coupling agent, adheres the filler weight block to the surface of the grinding wheel well, and fixes it by winding a wire. Finally, it is cured to form a tightly integrated whole with the grinding wheel, so that the imbalance of the grinding wheel is significantly reduced. After the rail grinding wheel is adjusted with the filler weight according to the method of the present invention, the filler weight block is tightly integrated and does not fall off, the imbalance of the grinding wheel is significantly reduced, the vibration, noise, and motor spindle wear during the use of the grinding wheel are reduced, and the yield of the grinding wheel is improved. The present invention effectively solves the scrapping phenomenon caused by the excessive imbalance of the traditional rail grinding wheel, reduces the occurrence of hazards such as high noise, high vibration, damage to the motor spindle, impact on the grinding wheel processing accuracy, and safety risks during the use of the grinding wheel, improves the yield of the grinding wheel, and reduces the manufacturing cost of the grinding wheel. DETAILED DESCRIPTION

[0023] A method for adjusting the unbalance of a rail grinding wheel comprises the following steps:

[0024] Step 1: Prepare mixed resin liquid

[0025] The resin liquid (10 parts to 17 parts) and the coupling agent (1 part to 2 parts) are mixed according to a mass ratio to obtain a mixed resin liquid.

[0026] Step 2: Prepare mixed resin powder

[0027] Resin powder (10 parts to 15 parts) and curing agent (1 part to 2 parts) are mixed according to a mass ratio to obtain mixed resin powder.

[0028] Step 3: Saturating the Glass Fiber

[0029] Place the glass fiber in the mixed resin solution prepared in step 1 and soak it for (2-4) hours.

[0030] Step 4: Prepare the mixture

[0031] The mixed resin liquid (10 parts to 15 parts) in step 1 and the mixed resin powder (20 parts to 30 parts) in step 2 are mixed according to a mass ratio to obtain a mixture.

[0032] Step 5: Add weight

[0033] Weigh the mixture in step 4 (10-15 parts) and the glass fiber soaked in step 3 (1-2 parts) in proportion to their mass. The weight should multiply the grinding wheel imbalance by a coefficient of 1.2-1.5. Then apply the mixture to the surface of the glass fiber, and place the coated glass fiber (hereinafter referred to as the filler weight) close to the side of the grinding wheel with lighter static imbalance.

[0034] Step 6: Reinforcement with wire wrapping

[0035] Use a winding machine to soak the glass fiber in the mixed resin liquid in step 1, and evenly wind it on the surface of the grinding wheel (8-10 layers).

[0036] Step 7: Curing

[0037] Place the wire-reinforced grinding wheel in a curing oven for curing.

[0038] The method of the present invention will be described in detail below with reference to the embodiments:

[0039] Example 1:

[0040] Step 1: Prepare mixed resin liquid

[0041] Phenolic resin liquid (10-15 parts), epoxy resin liquid (1-2 parts), and chromium chloride methacrylate coupling agent (1-2 parts) are mixed according to a mass ratio, added into a blender in descending order of mass fraction, and stirred at 300-500 r / min for 3-5 minutes until no obvious stratification occurs to obtain a mixed resin liquid.

[0042] Step 2: Prepare mixed resin powder

[0043] Phenolic resin powder (10-15 parts) and hexamethylenetetramine (1-2 parts) are mixed in a mass ratio and added into a V-type mixer in descending order of mass fraction, with the mixing volume ≤ 50% of the volume of the V-type mixer. The mixture is mixed at a speed of 20-30 r / min for 1-2 hours until the powder has no agglomerated particles, and then passed through a 100-mesh sieve to obtain a mixed resin powder.

[0044] Step 3: Saturating the Glass Fiber

[0045] Place the glass fiber in the mixed resin solution prepared in step 1 and soak it for 2-4 hours.

[0046] Step 4: Prepare the mixture

[0047] The mixed resin liquid (10-15 parts) in step 1 and the mixed resin powder (20-30 parts) in step 2 are mixed according to the mass ratio, and stirred at 100-200 r / min for 1-5 minutes using a stirrer.

[0048] Step 5: Add weight

[0049] Weigh the mixture in step 4 (10-15 parts) and the glass fiber soaked in step 3 (1-2 parts) in proportion to their mass. The weighed weight should multiply the grinding wheel imbalance by a coefficient of 1.2-1.5. Then apply the mixture to the surface of the glass fiber and place the coated glass fiber close to the side of the grinding wheel with lighter static imbalance.

[0050] Step 6: Reinforcement with wire wrapping

[0051] Use a winding machine to soak the glass fiber with the mixed resin liquid in step 1, and evenly wind it on the surface of the grinding wheel in 8-10 layers.

[0052] Step 7: Curing

[0053] Place the wire-reinforced grinding wheel in a curing oven for curing.

[0054] Example 2:

[0055] This embodiment is the same as Example 1, except that Example 2 does not use epoxy resin liquid. The specific steps are as follows:

[0056] Step 1: Prepare mixed resin liquid

[0057] Mix phenolic resin liquid (10-15 parts) and chromium chloride methacrylate coupling agent (1-2 parts) according to the mass ratio.

[0058] Step 2: Prepare mixed resin powder

[0059] Mix phenolic resin powder (10-15 parts) and hexamethylenetetramine (1-2 parts) according to the mass ratio.

[0060] Example 3:

[0061] This embodiment is the same as Example 1, except that Example 3 does not use epoxy resin liquid but polyimide resin powder. The specific steps are as follows:

[0062] Step 1: Prepare mixed resin liquid

[0063] Mix phenolic resin liquid (10-15 parts) and chromium chloride methacrylate coupling agent (1-2 parts) according to the mass ratio.

[0064] Step 2: Prepare mixed resin powder

[0065] Mix polyimide resin powder (10-15 parts) and hexamethylenetetramine (1-2 parts) according to the mass ratio.

[0066] Test and detection:

[0067] The imbalance correction was performed on the three grinding wheels of Example 1, Example 2, and Example 3. The data before and after the imbalance correction are shown in Table 1:

[0068] Table 1 shows the data of three types of grinding wheel imbalance before and after correction

[0069] Rail grinding wheels Unbalance before correction (g) After imbalance correction (g) Example 1 28 1 Example 2 28 2 Example 3 28 0

[0070] Rotational strength test:

[0071] The three grinding wheels of Example 1, Example 2, and Example 3 were tested for rotational strength to check whether the weight blocks fell off. The results of the rotational strength tests are shown in Table 2:

[0072] Table 2 shows the test results of three types of grinding wheel rotation strength

[0073] Rail grinding wheels <![CDATA[1.5V max Maintain for 30 seconds]]> Example 1 The weight block has not fallen off Example 2 The weight block has not fallen off Example 3 The weight block has not fallen off

[0074] As shown in Tables 1 and 2, after the rail grinding wheel was adjusted with the weight added using the example method, the weight block was tightly attached and did not fall off, and its imbalance was significantly reduced.

[0075] The grinding wheels shown in Examples 1, 2, and 3 of the present invention are respectively: a phenolic-epoxy hybrid resin grinding wheel, a phenolic resin grinding wheel, and a polyimide resin grinding wheel. Due to the different curing temperatures of the three grinding wheels, Example 1 is preferably suitable for the phenolic-epoxy hybrid resin grinding wheel, Example 2 is more suitable for the phenolic resin grinding wheel, and Example 3 is more suitable for the polyimide resin grinding wheel.

[0076] When the grinding wheel is curing, the moisture in its filler weight will evaporate. Therefore, the user can adjust the weight of the filler weight according to the actual process conditions. Generally, the filler weight should be multiplied by a coefficient of 1.2-1.5 based on the imbalance of the grinding wheel, so that the imbalance after curing is close to 0, achieving the ideal state.

Claims

1. A method for adjusting the unbalance of a rail grinding wheel, characterized by: The steps include: Step 1: Prepare mixed resin liquid: Mix 10-17 parts of resin liquid and 1-2 parts of coupling agent according to mass ratio to obtain a mixed resin liquid; Step 2: Prepare mixed resin powder: Mix 10-15 parts of resin powder and 1-2 parts of curing agent according to mass ratio to obtain mixed resin powder; Step 3: Wetting the glass fiber: Place the glass fiber in the mixed resin solution prepared in step 1 and soak it for 2 to 4 hours; Step 4: Prepare the mixture: Mix 10-15 parts of the mixed resin liquid prepared in step 1 and 20-30 parts of the mixed resin powder prepared in step 2 according to a mass ratio to obtain a mixture; Step 5: Add weight: Weigh 10-15 parts of the mixture prepared in step 4 and 1-2 parts of the glass fiber soaked in step 3 according to the mass ratio, then apply the mixture to the surface of the glass fiber to obtain a filler weight, and then place the filler weight close to the lighter side of the grinding wheel; Step 6: Reinforcement with silk wrapping: Use a winding machine to evenly wind the glass fiber soaked in step 3 on the surface of the grinding wheel in 8 to 10 layers; Step 7: Curing: The wire-reinforced grinding wheel is placed in a curing oven for curing.

2. The method for adjusting the unbalance of a rail grinding wheel according to claim 1, wherein: In step 5, the weighing weight is the grinding wheel imbalance multiplied by a coefficient of 1.2 to 1.

5.

3. The method for adjusting the unbalance of a rail grinding wheel according to claim 1, wherein: Step 1: When mixing, add the ingredients into the blender in descending order of mass fraction, and stir at 300-500 r / min for 3-5 minutes until no obvious stratification occurs.

4. The method for adjusting the unbalance of a rail grinding wheel according to claim 3, wherein: In step 2, add the ingredients into the V-type mixer in descending order of mass fraction, with the mixing volume ≤ 50% of the volume of the V-type mixer. Mix at a speed of 20-30 r / min for 1-2 hours until the powder has no agglomerated particles, and then pass through a 100-mesh sieve.

5. The method for adjusting the unbalance of a rail grinding wheel according to claim 4, characterized in that: When preparing the mixed resin solution in step 1, 10 to 15 parts of phenolic resin solution, 1 to 2 parts of epoxy resin solution, and 1 to 2 parts of chromium chloride methacrylate coupling agent are mixed according to the mass ratio.

6. The method for adjusting the unbalance of a rail grinding wheel according to claim 5, characterized in that: When preparing the mixed resin powder in step 2, 10 to 15 parts of phenolic resin powder and 1 to 2 parts of hexamethylenetetramine are mixed according to a mass ratio.

7. The method for adjusting the unbalance of a rail grinding wheel according to claim 4, characterized in that: In step 1, when preparing the mixed resin solution, 10 to 15 parts of phenolic resin solution and 1 to 2 parts of chromium chloride methacrylate coupling agent are mixed according to the mass ratio.

8. The method for adjusting the unbalance of a rail grinding wheel according to claim 7, characterized in that: When preparing the mixed resin powder in step 2, 10 to 15 parts of phenolic resin powder and 1 to 2 parts of hexamethylenetetramine are mixed according to a mass ratio.

9. The method for adjusting the unbalance of a rail grinding wheel according to claim 7, wherein: When preparing the mixed resin powder in step 2, 10 to 15 parts of polyimide resin powder and 1 to 2 parts of hexamethylenetetramine are mixed according to a mass ratio.