Grinding process for short and small eccentric step of eccentric shaft

Abstract

The invention belongs to the field of shaft part machining, and particularly relates to a grinding process for a short and small eccentric step of an eccentric shaft. A grinding process for short and small eccentric steps of an eccentric shaft comprises the following steps that S1, an eccentric shaft blank is machined; s2, the sleeve is machined, and the axis of an inner hole of the sleeve and the axis of the diameter section of the sleeve are parallel but not coincide; s3, the eccentric shaft blank is installed in the sleeve to form an assembly shaft, and the concentricity of the grinding step of the short and small eccentric table stage of the eccentric shaft and the axis of the diameter section of the sleeve is guaranteed; s4, the eccentric shaft is ground, specifically, a cut-in grinding mode is adopted, and steps are ground at the short and small eccentric table stage of the eccentric shaft; and S5, the eccentric shaft is taken out. The production process is easy, convenient and rapid to operate, high in machining efficiency, low in requirement for precision of production equipment and small in investment, and the machining quality of the eccentric shaft is greatly improved; the production cost is low.

Description

Technical Field

[0001] The invention belongs to the field of shaft parts processing, and in particular relates to a grinding process for a short eccentric step of an eccentric shaft. Background Art

[0002] Eccentric shaft parts are one of the commonly used typical parts. According to the different structural forms of shaft parts, they can generally be divided into smooth shaft eccentricity, stepped shaft eccentricity and special-shaped eccentric shafts, etc.; or divided into solid eccentric shafts, hollow eccentric shafts, etc. They are also used to support transmission parts such as gears and pulleys in machines to transmit torque or motion. An eccentric workpiece is a workpiece whose outer circle and outer circle or outer circle and inner hole axis are parallel but not coincident, and the distance between these two parallel axes is called eccentricity. When processing eccentric shafts, the eccentric step increases the difficulty of processing.

[0003] The eccentric shaft grinding process in the prior art generally uses a follow-up grinding device to grind the eccentric step of the product, but this process has high manufacturing costs, is only suitable for small batch or single piece production, has low processing accuracy and low processing efficiency, and has limitations for mass production processes. Summary of the invention

[0004] In order to solve the problems of low processing efficiency, low processing precision, unsuitability for mass production, high cost, etc. in the prior art eccentric shaft grinding process, the present invention proposes a eccentric shaft short eccentric step grinding process, comprising the following steps:

[0005] S1: Machining eccentric shaft blank:

[0006] The eccentric shaft blank comprises: an eccentric shaft non-grinding stage and an eccentric shaft short eccentric stage grinding step; the eccentricity of the eccentric shaft non-grinding stage and the eccentric shaft short eccentric stage grinding step axis is m1;

[0007] Among them: the center of gravity of the eccentric shaft blank is on the non-grinding stage of the eccentric shaft, the length of the non-grinding stage of the eccentric shaft is shorter than the eccentric shaft and the length of the grinding step of the eccentric stage is longer;

[0008] S2: Processing sleeve:

[0009] The sleeve comprises: a sleeve hollow section and a sleeve diameter section;

[0010] The hollow section of the sleeve is provided with a sleeve inner hole; the side wall of the hollow section of the sleeve is provided with a threaded hole that penetrates the sleeve inner hole; the length of the sleeve inner hole is L3;

[0011] The eccentricity between the axis of the sleeve inner hole and the axis of the sleeve diameter section is m2. The value of m2 is determined according to the specific situation. m2 ≥ 0 mm.

[0012] S3: The eccentric shaft blank is installed into the sleeve to form an assembled shaft:

[0013] Install the non-grinding stage of the eccentric shaft into the inner hole of the sleeve;

[0014] Screw the threaded holes on the side wall of the hollow section of the sleeve, and the concentricity of the grinding step of the short eccentric shaft and the axis of the sleeve diameter section should be ≤0.1mm;

[0015] S4: Grinding eccentric shaft;

[0016] Use plunge grinding to grind the short eccentric shaft and the small eccentric table to grind the steps.

[0017] S5: Remove the eccentric shaft:

[0018] After grinding, loosen the screws and take the eccentric shaft out of the sleeve; the eccentric shaft processing is completed.

[0019] According to the above-mentioned eccentric shaft short eccentric step grinding process, in step S1, the reserved grinding amount of the eccentric shaft short eccentric stage grinding step is 0.07-0.09mm.

[0020] According to the above-mentioned short eccentric step grinding process of an eccentric shaft, in step S2, the axis of the inner hole of the sleeve is parallel to the axis of the diameter section of the sleeve.

[0021] According to the above-mentioned short eccentric step grinding process for an eccentric shaft, the distance from the center of the threaded hole to the outer end surface of the hollow section of the sleeve is 2 / L3.

[0022] According to the above-mentioned eccentric shaft short eccentric step grinding process, in step S3, the non-grinding stage of the eccentric shaft is installed into the inner hole of the sleeve, and the concentricity of the grinding step of the short eccentric stage of the eccentric shaft and the axis of the sleeve diameter section is checked by a concentricity inspection tool.

[0023] According to the above-mentioned short eccentric step grinding process for an eccentric shaft, the concentricity checking fixture is a V-type tire concentricity checking fixture.

[0024] According to the above-mentioned short eccentric step grinding process of the eccentric shaft, the concentricity value of the short eccentric step grinding step of the eccentric shaft and the axis of the sleeve diameter section is ≤0.1mm.

[0025] According to the above-mentioned eccentric shaft short eccentric step grinding process, in step S3, the inner hole diameter of the sleeve is larger than the non-grinding stage diameter of the eccentric shaft, and the gap between the inner hole of the sleeve of the assembled shaft and the non-grinding stage of the eccentric shaft is as small as possible, and the diameter difference is generally within 0.01 mm.

[0026] According to the above-mentioned short eccentric step grinding process of an eccentric shaft, in step S4, the assembled shaft is placed on a plunge grinding device for processing. During processing, the short step diameter section of the eccentric shaft is placed on the support plate of the plunge grinding device, and the sleeve diameter section is placed on the support frame, and the center heights of the support plate and the support frame are consistent.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention makes a sleeve according to the structure of the eccentric shaft, and uses the sleeve to change the structure of the eccentric shaft. The sleeve diameter section with the same diameter as the grinding step of the short eccentric stage of the eccentric shaft is equivalent to extending the grinding step of the short eccentric stage of the eccentric shaft, so that the eccentric step of the eccentric shaft can be processed by plunge grinding, and the threaded hole is processed on the sleeve wall. The sleeve and the eccentric shaft can be fixed by screws to carry out processing. The production process is simple and fast, and novices can operate it. Therefore, the mass production of eccentric shafts is realized with high processing efficiency.

[0029] 2. During the processing of the sleeve of the present invention, the aperture and cylindricity of the inner hole of the sleeve, the diameter of the sleeve diameter section, the straightness and cylindricity of the shaft are strictly controlled. The concentricity requirement of the short eccentric step of the eccentric shaft and the axis of the small diameter section of the sleeve is met through the concentricity inspection of the concentricity inspection fixture, thereby greatly improving the processing quality of the eccentric shaft.

[0030] 3. The grinding of the eccentric step of the present invention adopts the plunge grinding method, which can be processed by an ordinary plunge grinding machine, has low requirements on the precision of the production equipment and small investment; the production cost is low and the efficiency is high, and the grinding can be completed within 5 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the eccentric shaft blank structure of step 1 of the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the sleeve in step 2 of the present invention.

[0033] Figure 3 It is a schematic diagram of the installation of the eccentric shaft blank and the sleeve in step 3 of the present invention.

[0034] Figure 4 This is a schematic diagram of the eccentric shaft blank and the sleeve being supported by the support block in step 4 of the present invention.

[0035] Figure 5 It is a schematic diagram of grinding the eccentric step in step 5 of the present invention.

[0036] In the figure: 1-eccentric shaft blank, 2-sleeve, 3-threaded hole, 4-screw, 5-concentricity gauge, 6-grinding wheel, 7-support plate, 8-guide wheel, 9-support frame, 11-eccentric shaft non-grinding stage, 12-eccentric shaft short eccentric stage grinding step, 21-sleeve hollow section, 22-sleeve diameter section, 23-sleeve inner hole, d1-eccentric shaft non-grinding stage diameter, d2-eccentric shaft short eccentric stage grinding step diameter , D1-sleeve inner hole diameter, D2-sleeve diameter section diameter, m2-eccentricity between the inner hole axis of the sleeve hollow section and the axis of the sleeve diameter section, m1-eccentricity between the axis of the eccentric shaft non-grinding table stage and the axis of the eccentric shaft short eccentric step diameter section, L1-eccentric shaft non-grinding table stage length, L2-eccentric shaft short eccentric table stage grinding step length, L3-sleeve inner hole length, 2 / L3-distance from the center of the screw hole to the outer end face of the sleeve hollow section. DETAILED DESCRIPTION

[0037] Preferred Embodiments

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] like Figures 1 to 5 As shown: A grinding process for a short eccentric step of an eccentric shaft includes the following steps:

[0040] S1: Machining eccentric shaft blank 1:

[0041] The eccentric shaft blank 1 comprises: an eccentric shaft non-grinding stage 11 and an eccentric shaft short eccentric stage grinding step 12; the eccentric distance between the eccentric shaft non-grinding stage 11 and the eccentric shaft short eccentric stage grinding step axis 12 is m1;

[0042] Wherein: the center of gravity of the eccentric shaft blank 1 is on the eccentric shaft non-grinding stage 11, and the length of the eccentric shaft non-grinding stage 11 is longer than the length of the eccentric shaft shorter eccentric stage grinding step 12;

[0043] S2: Processing sleeve 2:

[0044] The sleeve 2 comprises: a sleeve hollow section 21 and a sleeve diameter section 22;

[0045] The sleeve hollow section 21 is provided with a sleeve inner hole 23; a threaded hole 3 penetrating the sleeve inner hole 23 is provided on the side wall of the sleeve hollow section 21; the sleeve inner hole 23 has a length of L3;

[0046] The eccentricity between the axis of the sleeve inner hole 23 and the axis of the sleeve diameter section 22 is m2;

[0047] S3: The eccentric shaft blank 1 is installed into the sleeve 2 to form an assembled shaft:

[0048] Install the eccentric shaft non-grinding stage 11 into the sleeve inner hole 23;

[0049] Screw 4 is screwed on the threaded hole 3 on the side wall of the hollow section 21 of the sleeve, and the concentricity of the grinding step 12 of the short eccentric shaft and the axis of the sleeve diameter section 22 is ≤0.1mm;

[0050] S4: Grinding eccentric shaft;

[0051] Use the plunge grinding method to grind the short eccentric shaft and the eccentric stage to grind the step 12.

[0052] S5: Remove the eccentric shaft:

[0053] After grinding, loosen the screw 4 and take the eccentric shaft out of the sleeve 2; the eccentric shaft processing is completed.

[0054] In step S1, the reserved grinding amount of the grinding step 12 of the eccentric shaft short eccentric stage is 0.07-0.09 mm.

[0055] In step S2 , the axis of the sleeve inner hole 23 is parallel to the axis of the sleeve diameter section 22 .

[0056] The distance from the center of the threaded hole 3 to the outer end surface of the sleeve hollow section 21 is 2 / L3.

[0057] In step S3, the eccentric shaft non-grinding stage 11 is installed into the sleeve inner hole 23, and the concentricity of the eccentric shaft short eccentric stage grinding step 12 and the axis of the sleeve diameter section 22 is checked by the concentricity inspection tool 5. The concentricity inspection tool 5 is a V-type tire concentricity inspection tool.

[0058] The concentricity value of the grinding step 12 of the eccentric shaft short eccentric stage and the axis of the sleeve diameter section 22 is ≤0.1mm.

[0059] In step S3 , the sleeve inner hole diameter D1 is larger than the eccentric shaft non-grinding stage diameter d1 , and there is a gap between the sleeve inner hole 23 of the assembled shaft and the eccentric shaft non-grinding stage 11 .

[0060] The clearance between the inner hole 23 of the sleeve and the non-grinding stage 11 of the eccentric shaft is ≤0.01 mm.

[0061] In step S4, the assembled shaft is placed on the plunge mill for processing. During processing, the short step diameter section of the eccentric shaft is placed on the support plate 7 of the plunge mill, and the sleeve diameter section 22 is placed on the support frame 9. The center heights of the support plate 7 and the support frame 9 are consistent.

[0062] like Figure 1As shown: Step 1: The center of gravity of the eccentric shaft blank 1 is on the non-grinding stage 11 of the eccentric shaft, and the length L1 of the non-grinding stage of the eccentric shaft is longer than the length L2 of the grinding step of the short eccentric stage of the eccentric shaft, and the grinding step 12 of the short eccentric stage of the eccentric shaft cannot be realized when using the plunge grinding. The sleeve 2 is used to change the structure of the eccentric shaft, and the sleeve diameter section 22 with the same diameter as the grinding step 11 of the short eccentric stage of the eccentric shaft is equivalent to extending the grinding step 11 of the short eccentric stage of the eccentric shaft, so that the grinding step 11 of the short eccentric stage of the eccentric shaft can be processed by the plunge grinding method. The grinding step 11 of the short eccentric stage of the eccentric shaft is ground by the plunge grinding, and the grinding allowance of the grinding step 11 of the short eccentric stage of the eccentric shaft is 0.07-0.09mm.

[0063] Step 2: Processing sleeve 2:

[0064] The eccentric shaft short eccentric stage 12 can be arranged in the inner hole 23 of the sleeve, and the eccentric shaft short eccentric stage 12 is coaxial with the sleeve diameter section 22;

[0065] According to the structure of the eccentric shaft, the sleeve 2 is designed, and the center of gravity of the eccentric shaft is changed by using the sleeve 2. The sleeve diameter section 22 having the same diameter d2 as the grinding step of the short eccentric stage of the eccentric shaft is processed on the sleeve 2. The sleeve inner hole 23 for placing the non-grinding stage 11 of the eccentric shaft is processed on the sleeve 2. The sleeve 2 is combined with the eccentric shaft blank 1 by using the sleeve inner hole 23. Finally, the grinding step 12 of the short eccentric stage of the eccentric shaft is made coaxial with the sleeve diameter section 22, that is, the grinding step 12 of the short eccentric stage of the eccentric shaft is extended by the sleeve 2.

[0066] Structural features of sleeve 1: the diameter D1 of the inner hole of the sleeve is larger than the diameter d1 of the non-grinding stage of the eccentric shaft, and the gap between the inner hole 23 of the sleeve and the non-grinding stage 11 of the eccentric shaft is ≤0.01mm.

[0067] In order to quickly assemble the sleeve 2 and the eccentric shaft blank 1, the eccentricity m2 between the axis of the sleeve inner hole and the axis of the sleeve diameter section and the eccentricity m1 between the axis of the non-grinding stage of the eccentric shaft and the axis of the grinding step of the short eccentric step of the eccentric shaft should be equal.

[0068] The inner hole 23 of the sleeve is parallel to the axis of the sleeve diameter section 22 .

[0069] A threaded hole 3 penetrating the sleeve inner hole 23 is provided on the sleeve hollow section 21. When the eccentric shaft non-grinding stage 11 is placed into the sleeve inner hole 23, the threaded hole 3 is used to tighten the screw 4 so that the sleeve 1 and the eccentric shaft blank 1 are integrated.

[0070] A sleeve diameter section 22 is provided on the sleeve 2, and the sleeve diameter section diameter D2 = the eccentric shaft short eccentric stage grinding step diameter d2. The sleeve diameter section 22 is the key to realize the eccentric shaft short eccentric stage grinding step 12 using the plunge grinding method. The criterion for determining whether the sleeve 2 and the eccentric shaft blank 1 are installed in place is that the sleeve diameter section 22 is concentric with the eccentric shaft short eccentric stage grinding step diameter 12. At this time, the structure of the eccentric shaft blank is transformed, thereby achieving the grinding effect.

[0071] Step 3: Install the eccentric shaft blank 1 into the sleeve 2 to form an assembled shaft:

[0072] Install the eccentric shaft non-grinding stage 12 into the sleeve inner hole 23;

[0073] Screw 4 is screwed on the threaded hole 3 on the side wall of the hollow section 21 of the sleeve, and the screw 4 is not tightened at this time; the concentricity value of the eccentric shaft non-grinding stage 11 and the sleeve diameter section 22 is ≤0.1mm;

[0074] Put the assembled shaft on the V-type tire concentricity inspection fixture and install it carefully according to the specified concentricity value requirements. When the concentricity is greater than the specification value, rotate the eccentric shaft blank 1 so that the concentricity of the eccentric shaft short eccentric stage grinding step 12 and the sleeve diameter section 22 meets the specification value requirements. At this time, tighten the screw 4.

[0075] Through the above steps, the structure of the original eccentric shaft blank 1 is transformed, and the transformed structure can be ground on the plunge grinding equipment. That is, the structure of the grinding step 12 of the eccentric shaft short eccentric stage is transformed, so that the grinding step 12 of the eccentric shaft short eccentric stage and the sleeve diameter section 22 together constitute the center of gravity of the workpiece, and the sleeve diameter section 22 is used to compensate for the defect of the short grinding step 12 of the eccentric shaft short eccentric stage.

[0076] Step 4: Grinding the eccentric shaft;

[0077] The plunge grinding method is adopted to grind the short eccentric shaft and the eccentric stage to grind the step 12, and the grinding time is within 5 seconds;

[0078] First, set the center height of the support plate 7 and the support frame 9 of the plunge grinding equipment to be the same;

[0079] Then the eccentric shaft short eccentric stage grinding step 12 is set on the support plate 7, and the sleeve diameter section 22 is set on the support frame 9;

[0080] Turn on the plunge grinding equipment to grind the eccentric shaft, the short eccentric table and the grinding step 12.

[0081] Step 5: Remove the eccentric shaft:

[0082] After grinding, loosen the screw 4 and take the eccentric shaft out of the sleeve 2; the eccentric shaft processing is completed.

[0083] After processing, the eccentric shaft eccentric step has an outer diameter tolerance of less than 0.003mm, an eccentric distance tolerance of less than 0.06mm, and a roughness of less than RZ2. It has high production efficiency, high quality, and low production cost. It reduces the requirements for equipment and can be achieved by ordinary plunge grinding machines.

[0084] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A grinding process for a short eccentric step of an eccentric shaft, characterized in that: The following steps are involved: S1: Machining eccentric shaft blank: The eccentric shaft blank comprises: an eccentric shaft non-grinding stage and an eccentric shaft short eccentric stage grinding step; the eccentricity of the eccentric shaft non-grinding stage and the eccentric shaft short eccentric stage grinding step axis is m1; Among them: the center of gravity of the eccentric shaft blank is on the non-grinding stage of the eccentric shaft, the length of the non-grinding stage of the eccentric shaft is shorter than the eccentric shaft and the length of the grinding step of the eccentric stage is longer; S2: Processing sleeve: The sleeve comprises: a sleeve hollow section and a sleeve diameter section; The hollow section of the sleeve is provided with a sleeve inner hole; the side wall of the hollow section of the sleeve is provided with a threaded hole that penetrates the sleeve inner hole; the length of the sleeve inner hole is L3; The eccentricity between the axis of the sleeve inner hole and the axis of the sleeve diameter section is m2; the value of m2 depends on the specific situation, m2 ≥ 0 mm; S3: The eccentric shaft blank is installed into the sleeve to form an assembled shaft: Install the non-grinding stage of the eccentric shaft into the inner hole of the sleeve; Screw the threaded holes on the side wall of the hollow section of the sleeve, and the concentricity of the grinding step of the short eccentric shaft and the axis of the sleeve diameter section should be ≤0.1mm; S4: Grinding eccentric shaft; Use plunge grinding to grind the short eccentric shaft and the small eccentric table to grind the steps; S5: Remove the eccentric shaft: After grinding, loosen the screws and take the eccentric shaft out of the sleeve; the eccentric shaft processing is completed.

2. The eccentric shaft short eccentric step grinding process according to claim 1 is characterized in that: In step S1, the reserved grinding amount of the grinding step of the eccentric shaft short eccentric table stage is 0.07-0.09mm.

3. The eccentric shaft short eccentric step grinding process according to claim 2 is characterized in that: In step S2, the axis of the sleeve inner hole is parallel to the axis of the sleeve diameter section.

4. The eccentric shaft short eccentric step grinding process according to claim 3 is characterized in that: The distance from the center of the threaded hole to the outer end surface of the hollow section of the sleeve is 2 / L3.

5. The eccentric shaft short eccentric step grinding process according to claim 4 is characterized in that: In step S3, the non-grinding stage of the eccentric shaft is installed into the inner hole of the sleeve, and the concentricity of the grinding step of the short eccentric stage of the eccentric shaft and the axis of the sleeve diameter section is checked by a concentricity inspection tool.

6. The eccentric shaft short eccentric step grinding process according to claim 5, characterized in that: The concentricity checking fixture is a V-type tire concentricity checking fixture.

7. The eccentric shaft short eccentric step grinding process according to claim 6, characterized in that: The concentricity value of the grinding step of the short eccentric stage of the eccentric shaft and the axis of the sleeve diameter section is ≤0.1mm.

8. The eccentric shaft short eccentric step grinding process according to claim 7, characterized in that: In step S3, the inner hole diameter of the sleeve is larger than the diameter of the non-grinding stage of the eccentric shaft. The smaller the gap between the inner hole of the sleeve of the assembled shaft and the non-grinding stage of the eccentric shaft, the better. Generally, the diameter difference is within 0.01 mm.

9. A grinding process for a short eccentric step of an eccentric shaft according to claim 1 or 8, characterized in that: In step S4, the assembled shaft is placed on a plunge mill for processing. During processing, the short step diameter section of the eccentric shaft is placed on a support plate of the plunge mill, and the sleeve diameter section is placed on a support frame, and the center heights of the support plate and the support frame are consistent.

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