A method for adjusting the balance of large-size graded wheels

Abstract

This invention discloses a method for dynamic balancing adjustment of large-size graded wheels, comprising the following steps: S1: Machining allowance adjustment: Before the dynamic balancing test of the graded wheel, the lathe is used to center the inner diameter gauge, leaving an allowance for subsequent eccentricity repair during machining of the outer diameter; S2: Eccentricity repair and weight reduction: Based on the structure of the first dynamic balancing test, the area of ​​concentrated imbalance is determined, an eccentricity repair drawing is made, and the theoretical weight reduction value is calculated; S3: The lathe tool repairs the outer diameter of the product according to the eccentricity repair drawing in S2 and performs a dynamic balancing test again; S4: Fine-tuning after eccentricity: Based on the dynamic balancing test results in S4, and combined with the drilling weight reduction process, fine-tuning of the dynamic balancing is performed. The combination of eccentricity weight reduction and drilling weight reduction increases the upper limit of weight reduction while ensuring the dynamic balancing accuracy grade of graded wheels is G2.5, thereby improving the pass rate.

Description

Technical Field

[0001] This invention relates to the field of ceramic processing technology, and in particular to a method for adjusting the dynamic balance of large-size graded wheels. Background Technology

[0002] A classifying wheel is a device used for separating powder particles by size. Under the strong centrifugal force generated by the high-speed rotating classifying turbine, coarse and fine materials moving with the rising airflow to the classifying zone are separated. Fine particles that meet the particle size requirements pass through the classifying wheel and enter the next component for collection, while coarse particles descend to the crushing zone for further crushing.

[0003] Unbalanced ceramic grading wheels can lead to cracking. Current manufacturing processes typically involve machining all dimensions according to the product drawings, then designing a drilling and weight-reduction pattern based on dynamic balance test results. This is achieved by drilling weight-reduction holes in areas where imbalance is concentrated. However, this method has several drawbacks: 1. Low weight-reduction limit: if the hole depth exceeds 12mm or the number of holes exceeds 8, the grading wheel cannot function properly; 2. Complex drilling and weight-reduction process, time-consuming, and costly; 3. Poor targeting: the imbalance distribution of the grading wheel is continuous circumferentially and uniform axially, while the weight-reduction holes are discrete and only distributed on the upper and lower surfaces of the product. Drilling and weight-reduction cannot effectively address the distribution of imbalance.

[0004] Existing technologies include composite processing schemes, such as the simulation and optimization method for dynamic balancing of a rotary chopper drum disclosed in application number CN202111575016.1. This method involves creating a 3D model of the rotary chopper on the SOLIDWORKS platform, assembling the assembly according to work requirements, analyzing the structural characteristics of the drum body, performing secondary dynamic balancing optimization on the whole, optimizing the dynamic balancing of the chopper shaft, designing the dynamic balancing of the drum body, creating a 2D scheme diagram, breaking it down into 2D part drawings, and conducting trial production. After the improved rotary chopper is installed, a dynamic balancing experiment is performed.

[0005] Although the above solution meets the dynamic balance requirements for the sixteen-section rotary chopper roller and provides a solution in its structural design, eliminating unstable vibrations during high-speed operation, it still cannot solve the problem that in traditional punching and weight removal solutions, the weight removal holes are discrete and only distributed on the upper and lower end faces of the product, and punching and weight removal cannot effectively address the distribution of imbalance. Summary of the Invention

[0006] In response to the problem mentioned in the background art that it is difficult to effectively reduce the weight in areas where the imbalance of the grading wheel is concentrated, this invention provides a dynamic balancing adjustment method for large-size grading wheels. It adopts an eccentric repair method to reduce the imbalance, which is simple, low-cost, easy to operate, and widely applicable. Combined with drilling weight reduction, it can increase the upper limit of weight reduction and improve the pass rate while ensuring the dynamic balancing accuracy grade of the grading wheel G2.5.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for adjusting the dynamic balance of a large-size graded wheel includes the following steps: S1: Machining allowance adjustment: Before the dynamic balance test of the graded wheel, the lathe is used to mark the center of the inner diameter gauge, and an allowance is left when machining the outer diameter for subsequent eccentricity repair.

[0009] S2: Eccentric Repair and Weight Reduction: Based on the structure of the first dynamic balancing test, determine the area of ​​concentrated imbalance, draw up the eccentric repair drawings, and calculate the theoretical weight reduction value;

[0010] S3: The lathe tool repairs the outer diameter of the product according to the eccentric repair drawing in S2 and performs dynamic balance test again;

[0011] S4: Fine-tuning after eccentricity: Fine-tuning of dynamic balance is carried out based on the dynamic balance test results in S4 and the drilling and weight removal process.

[0012] Furthermore, the outer diameter of the grading wheel is H, where H ≥ 400 mm.

[0013] Preferably, the allowance on one side when machining the outer diameter in S1 is K, and when 400mm≤H≤500mm, 0.5mm<K<0.7mm.

[0014] As a preferred option, the theoretical upper limit of the weight reduction value described in S2 is 28.2g.

[0015] As a preferred option, the single-sided allowance left when machining the outer diameter in S1 is K, and when 500mm≤H, 0.7mm<K<0.9mm.

[0016] As a preferred option, the theoretical upper limit of the weight reduction value described in S2 is 33.8g.

[0017] As a preferred embodiment, in S2, based on the dynamic balance test results, the unbalance distribution area is marked on the product, a center line passing through the center of the inner diameter circle is drawn for the unbalance distribution area, and an eccentric outer diameter circle is drawn with the center of the circle on the center line to simulate the weight-reducing area.

[0018] Preferably, the grading wheel is made of alumina ceramic.

[0019] Therefore, the present invention has the following beneficial effects: (1) The unbalance is reduced by using eccentric repair, which is simple, low-cost, easy to operate and widely applicable; (2) The combination of eccentric weight removal and hole weight removal increases the upper limit of weight removal and improves the pass rate while ensuring the graded wheel dynamic balance accuracy level G2.5. Attached Figure Description

[0020] Figure 1 A schematic diagram of the method of the present invention.

[0021] Figure 2 A schematic diagram illustrating the traditional method of removing weight by drilling holes on the back of the grading wheel.

[0022] Figure 3 A schematic diagram illustrating the traditional method of removing weight by drilling holes in the end face of the grading wheel.

[0023] Figure 4 This is a schematic diagram of the method for eccentric weight removal on the back of the grading wheel in this invention.

[0024] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0025] In the picture: 100 graded wheel, 200 lathe tool. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] Example 1

[0028] In order to overcome the processing difficulties of existing technologies, this patent proposes an eccentric weight removal scheme for dynamic balance adjustment of large-size graded wheels, which includes three steps: lathe machining allowance adjustment, eccentric repair weight removal, and fine adjustment after eccentricity.

[0029] Machining allowance adjustment: For graded wheels 100 with a diameter of 400~500, before performing dynamic balance test, the inner diameter gauge of the lathe is centered. When machining the outer diameter, the size is no longer machined to the required position in one step, but a radial allowance is left for subsequent eccentricity repair.

[0030] Eccentricity Repair and Weight Reduction: Based on the results of the first dynamic balancing test of the product, determine the areas where the imbalance is concentrated, draw an eccentricity repair drawing, and calculate the theoretical weight reduction value. Use lathe tool 200 to repair the outer diameter of the product according to the eccentricity drawing and perform a second dynamic balancing test.

[0031] Fine-tuning after eccentricity repair: Based on the dynamic balance test results after the product is repaired for eccentricity, the machining center can perform fine-tuning of the dynamic balance by combining the original drilling and weight removal process.

[0032] In this method, please refer to Figure 1 This invention patent designs a new method for dynamic balancing adjustment of large-size ceramic grading wheels, including three steps: lathe machining allowance adjustment, eccentric repair and weight reduction, and fine-tuning after eccentricity adjustment. The grading wheel is made of alumina ceramic and has an outer diameter of not less than 400 mm.

[0033] Methods for adjusting machining allowance:

[0034] As a preferred option, for alumina ceramic grading wheels with an outer diameter of 400-500 mm, a 0.6 mm allowance should be left on each side when machining the outer diameter on a lathe, with a theoretical upper limit of 28.2 g for eccentric weight reduction.

[0035] As a preferred option, if the outer diameter of the alumina ceramic classifier wheel is greater than 500, the single-sided allowance can be increased to 0.8, and the theoretical upper limit of eccentric weight removal is 33.8g.

[0036] Methods for balancing eccentricity:

[0037] Please see Figure 4 , 5 Based on the dynamic balancing test results, the unbalance distribution area is marked on the product. A center line passing through the center of the inner diameter circle is drawn in this area. An eccentric outer diameter circle is then drawn with the center of the circle on the center line to simulate the weight-reducing area. The inner diameter center is marked on the lathe, and then the outer diameter is adjusted to the final product size according to the drawing, offsetting the center of the circle, thus achieving the purpose of dynamic balancing adjustment.

[0038] Fine-tuning after eccentricity:

[0039] Please see Figure 2 , Figure 3 Based on the dynamic balance test results after eccentric repair, the unbalance distribution area is marked on the product, and the traditional drilling method is used for fine adjustment.

[0040] After the ceramic grading wheel is repaired by eccentric weight removal, the imbalance can be controlled to below 16g. When drilling holes for weight removal, the number of weight removal holes can be controlled to below 5, which meets the usage requirements.

[0041] In addition to the embodiments described above, within the scope disclosed in the claims and specification of this invention, the technical features of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A method for adjusting the dynamic balance of large-size graded wheels, characterized in that, Includes the following steps: S1: Machining allowance adjustment: Before the graded wheel dynamic balance test, mark the center of the inner diameter gauge on the lathe, and leave an allowance when machining the outer diameter for subsequent eccentricity repair. S2: Eccentric Repair and Weight Reduction: Based on the results of the first dynamic balancing test, mark the unbalance distribution area on the product, draw a center line through the center of the inner diameter circle for the unbalance distribution area, take the center of the circle on the center line to draw an eccentric outer diameter circle, simulate the weight reduction area, and calculate the theoretical weight reduction value. S3: The lathe tool repairs the outer diameter of the product according to the eccentric repair drawing in S2 and performs dynamic balance test again; S4: Fine-tuning after eccentricity: Fine-tuning of dynamic balance is carried out based on the dynamic balance test results in S3 and the drilling and weight removal process.

2. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 1, characterized in that, The outer diameter of the grading wheel is H, where H ≥ 400 mm.

3. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 1, characterized in that, The allowance left on one side when machining the outer diameter in S1 is K. When 400mm≤H≤500mm, 0.5mm<K<0.7mm.

4. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 3, characterized in that, The theoretical upper limit for weight removal, as described in S2, is 28.2g.

5. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 1, characterized in that, The allowance for machining the outer diameter in S1 is K. When 500mm≤H, 0.7mm<K<0.9mm.

6. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 2, characterized in that, The theoretical upper limit of the weight reduction value described in S2 is 33.8g.

7. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 1, characterized in that, In S2, based on the dynamic balance test results, the weight-removal area is simulated, and the outer diameter is repaired according to the offset center of the drawing to the final size of the product, so as to achieve the purpose of dynamic balance adjustment.

8. The method for adjusting the dynamic balance of a large-size graded wheel according to claim 1, characterized in that, The grading wheel is made of alumina ceramic.

Images