Gear pair contact patch inspection and evaluation method

Abstract

The application discloses a kind of gear pair contact spot inspection evaluation methods, comprising S1: obtaining the drawing parameters of speed reducer gear, making gear pair contact spot evaluation card;S2: coloring operation is carried out to gear working tooth surface, then the gear pair contact spot evaluation card made is placed in gear working tooth surface, whether contact spot meets technical index requirement is judged;If meet, then enter S3, if not meet, then discard or re-adjust;S3: the contact spot of coloring is transferred, and the transfer result is pasted in table.This application makes evaluation card by gear parameters, gear practice technical requirement and gear pair contact spot requirement, whether gear pair contact spot meets technical index requirement can be quickly and accurately evaluated by evaluation card, improve inspection efficiency.At the same time, it avoids the misjudgment phenomenon caused by personal subjective factors, improves assembly quality while ensuring inspection consistency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gearboxes, in particular to a gear pair contact spot inspection and evaluation method. BACKGROUND

[0002] With the development of modern industry, the quality requirement of gear transmission is higher and higher, and the contact precision of gear pair directly affects the carrying capacity and service life of the gear. Gear contact spot detection is an observation and detection item specified to ensure the contact precision of gear pair. The quality of gear transmission and service life are closely related to the contact spot of gear pair, and it is one of the important indicators for evaluating the meshing precision of gear.

[0003] The contact spot of gear pair is the comprehensive influence of various geometric parameter errors on the transmission quality, and it is the comprehensive reflection of gear manufacturing errors and assembly errors. The commonly used inspection and evaluation method for gear pair contact spot inspection is coloring method. After coloring, the inspector makes visual evaluation according to the assembly process, inspection file requirements and the like, such as estimation method or measurement method. Such inspection results have subjective judgment components, and the inspection results often vary from person to person, which cannot guarantee the assembly consistency, that is, the accuracy is low, and the work efficiency is low.

[0004] The estimation method is to estimate according to the contact spot of tooth length and tooth height, and the percentage of the whole tooth length or the whole tooth height. There is a certain subjective judgment of human, and the inspection results of different experienced inspectors often differ greatly, and the assembly precision inspection consistency is poor.

[0005] The measurement method is to measure by using a steel ruler or a triangular ruler, but in actual operation, the gear modification and modification direction technical requirements are different from the actual development length of the tooth surface, which cannot be directly measured. The measurement data still needs to be calculated according to the helix angle and modification parameters. When calculating the gear with modified or chamfered teeth, the modified or chamfered part needs to be subtracted. If directly measured, there is also invalid area contact spot to mislead the judgment of the inspection result, which affects the product quality. SUMMARY

[0006] In view of the technical problem of low inspection precision of gear pair contact spot in the prior art, the present application provides a gear pair contact spot inspection and evaluation method, which makes a gear pair contact spot requirement evaluation card to uniformly measure the size of the contact spot, avoids the influence of human subjective factors, and improves the inspection precision and efficiency.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] A gear pair contact spot inspection and evaluation method, specifically comprising the following steps:

[0009] S1: Obtain the drawing parameters of the reducer gear, and make a gear pair contact spot evaluation card;

[0010] S2: Perform coloring operation on the working tooth surface of the gear, then place the made gear pair contact spot evaluation card on the working tooth surface of the gear, and judge whether the contact spot meets the technical index requirements; if yes, go to S3, if not, perform assembly adjustment or gear grinding;

[0011] S3: Transfer the colored contact spot, and paste the transfer result in the table.

[0012] Preferably, in S1, the drawing parameters include the length L of the working tooth surface along the tooth direction, the length B of the tooth surface involute development, and the length m of the end modification surface, and m=n%*L.

[0013] Preferably, in S1, the gear pair contact spot evaluation card includes a first area, and the first area is sequentially provided with a first end modification surface, a second area, and a second end modification surface; the lower end of the second area is provided with a first scale, and the length of the second area is equally divided into K equal parts; the right end of the second area is provided with a second scale, and the width of the second area is equally divided into P equal parts.

[0014] Preferably, the first scale includes 50%, 60%, 70%, 80%, 90%, and 100%; and the second scale includes 10%, 20%, 30%, 40%, and 50%.

[0015] Preferably, the length of the first area is L, and the width is B; the first end modification surface and the second end modification surface are respectively located at the left and right sides of the first area, and the length of each is m, and the width of each is B; the length of the second area is L-2m, and the width is B / 2; the distance between the upper end of the second area and the upper end of the first area is B / 4, and the distance between the lower end of the second area and the lower end of the first area is B / 4.

[0016] Preferably, the lower end of the first end modification surface is the grinding starting position, and the upper end is the addendum position.

[0017] Preferably, in S1, the material of the gear pair contact spot evaluation card is a plastic plate.

[0018] Preferably, in S2, the coloring operation of the working tooth surface of the gear is:

[0019] A coloring agent is applied on the working tooth surface of the driving gear, then a driving torque is applied on the driving gear, the driving gear drives the driven gear, and the driven gear also applies a proper braking torque, and when the colored tooth surface of the driving gear is fully engaged with the driven gear, the contact spot is formed.

[0020] Preferably, in S2, the step of judging whether the contact spot meets the technical index requirements is:

[0021] After the gear pair contact spot evaluation card is placed behind the gear working tooth surface, the contact spot is compared with the first scale and the second scale of the second area, the comparison value is read, the comparison value is compared with the preset threshold A and B, if the contact spot along the tooth length is greater than or equal to A%, and along the tooth height is greater than or equal to B%, it is considered that the technical index requirement is met, otherwise it is considered that the technical index requirement is not met.

[0022] Preferably, in S3, the length and width of the first area, the length of the first end finish and the second end finish, the first scale and the second scale in the second area are marked in the table.

[0023] In summary, compared with the prior art, the present application has at least the following beneficial effects:

[0024] The present application prepares an evaluation card through gear parameters, gear finishing technical requirements and gear pair contact spot requirements, and the evaluation card can quickly and accurately evaluate whether the gear pair contact spot meets the technical index requirements, thereby improving the inspection efficiency.

[0025] At the same time, the phenomenon of misjudgment caused by personal subjective factors is avoided, the assembly quality is improved, and the inspection consistency is ensured.

[0026] The present application facilitates the re-inspection of the gear pair contact spot of the speed reducer and the quick review of the inspection results by non-inspection personnel, and provides data support for subsequent maintenance and repair of the speed reducer. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a coloring result schematic diagram of the existing herringbone tooth working tooth surface.

[0028] Figure 2 It is an existing gear pair contact spot transfer printing schematic diagram.

[0029] Figure 3 It is a gear pair contact spot inspection and evaluation method schematic diagram according to an exemplary embodiment of the present application.

[0030] Figure 4 It is a gear pair contact spot evaluation card structure schematic diagram according to an exemplary embodiment of the present application.

[0031] Figure 5 It is a gear pair contact spot evaluation card example schematic diagram according to an exemplary embodiment of the present application.

[0032] Figure 6 It is a gear pair contact spot transfer printing schematic diagram according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0033] The application will be further described in conjunction with the embodiments and specific implementation manners. However, it should not be understood as a limitation on the scope of the above-mentioned subject matter of the application only to the following embodiments. Any technology achieved based on the content of the application belongs to the scope of the application.

[0034] In the description of the application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0035] In order to ensure the gear transmission accuracy, the high-precision reducer will propose the contact spot requirements of the gear pair when designing the gear part, that is, the working tooth surface contact spot of the gear pair needs to meet the requirements of along the tooth length ≥ A%, along the tooth height ≥ B%, A and B are preset thresholds. In order to test the technical indicators of the gear pair contact spot, the coloring method is generally used for gear pair contact spot testing during assembly, that is, coloring agent is applied on the working tooth surface of the driving gear, then driving torque is applied on the driving gear, the driven gear is also applied with appropriate braking torque through the driving of the driving gear, when the colored tooth surface of the driving gear is fully engaged with the driven gear, the contact condition of the gear pair is checked. The coloring result of the herringbone tooth working tooth surface is shown in Figure 1 After coloring, the contact spot of the working tooth surface needs to be evaluated, and the evaluation is generally performed by estimation or measurement, and the consistency of the evaluation result is poor and the efficiency is low.

[0036] After the contact spot of the gear pair is determined to be qualified, the coloring condition needs to be transferred and recorded, which is used for checking the engagement trace after the use of the reducer, determining whether the gear part can continue to be used, and providing technical support for the maintenance of the reducer. The coloring condition transfer and recording result is shown in Figure 2 .

[0037] As shown in Figure 3 , the application provides a gear pair contact spot testing and evaluation method, which comprises the following steps:

[0038] S1: Obtain the drawing parameters of the reducer gear, and make a gear pair contact spot evaluation card.

[0039] In this embodiment, the drawing parameters of the reducer gear are obtained, and the drawing parameters include the length L of the working tooth surface along the tooth direction, the length B of the tooth surface involute development, and the length m of the end modification surface, and m = n% × L. The drawing parameters of the reducer gear have been determined in the design stage, and the application only needs to obtain the parameters for application.

[0040] As Figure 4 shown, the gear pair contact spot evaluation card includes a first area, a first end finish in the first area, a second area, and a second end finish arranged in sequence. A first scale is arranged at the lower end of the second area, which divides the length of the second area into K equal parts, and the first scale includes 50%, 60%, 70%, 80%, 90%, and 100%. A second scale is arranged at the right end of the second area, which divides the width of the second area into P equal parts, and the second scale includes 10%, 20%, 30%, 40%, and 50%.

[0041] In this embodiment, in the drawing of the reducer gear, the lower end of the end finish is the gear grinding starting position (the direction of the dedendum), and the upper end of the end finish is the addendum position; the second area is the working tooth surface.

[0042] The length of the first area is L, and the width is B; the first end finish and the second end finish are respectively located at the left and right sides of the first area, and the length of each is m, and the width of each is B; the length of the second area is L-2m, and the width is B / 2; the distance between the upper end of the second area and the upper end of the first area is B / 4, and the distance between the lower end of the second area and the lower end of the first area is B / 4.

[0043] In this embodiment, the gear pair contact spot evaluation card can be changed according to different parameters of the drawing of the reducer gear, but the production process and structure are the same.

[0044] In this embodiment, the gear pair contact spot evaluation card can be made of soft plastic plate.

[0045] As Figure 5 shown, the gear pair contact spot evaluation card includes a first area, a first end finish in the first area, a second area, and a second end finish arranged in sequence. A first scale is arranged at the lower end of the second area, which divides the length of the second area into K equal parts, and the first scale includes 50%, 60%, 70%, 80%, 90%, and 100%. A second scale is arranged at the right end of the second area, which divides the width of the second area into P equal parts, and the second scale includes 10%, 20%, 30%, 40%, and 50%.

[0046] The lower end of the first end finish (first end finish part) and the second end finish (second end finish part) is the gear grinding starting position (the direction of the dedendum), and the upper end is the addendum position; the length is 34.3 mm, and the width is 25.1 mm.

[0047] The length of the second area is 160.2 mm (100%), so the length of 50% of the second area is 80.1 mm, the length of 60% of the second area is 96.1 mm, the length of 70% of the second area is 112.1 mm, the length of 80% of the second area is 128.1 mm, and the length of 90% of the second area is 144.1 mm; the inner width of the second area is 12.55 mm (50%), the outer width of the second area is 15.05 mm (60%), and the working tooth surface has a certain contour, so there is a difference between the inner and outer widths.

[0048] S2: Color the gear working tooth surface, and then place the prepared gear pair contact spot evaluation card on the gear working tooth surface to determine whether the contact spot meets the technical index requirements; if yes, go to S3, and if not, perform assembly adjustment or gear grinding.

[0049] In this embodiment, the coloring operation of the gear working tooth surface is as follows:

[0050] Apply a colorant to the working tooth surface of the driving gear, then apply a driving torque to the driving gear. The driving gear drives the driven gear, and the driven gear is also subjected to an appropriate braking torque. When the colored tooth surface of the driving gear is fully engaged with the driven gear, a contact spot is formed.

[0051] When designing gear components for high-precision reducers, requirements for the contact pattern of the gear pair are specified to ensure gear transmission accuracy. Specifically, the contact pattern of the working tooth surface of the gear pair must meet the following conditions: ≥A% along the tooth length and ≥B% along the tooth height, where A and B are preset thresholds.

[0052] In this embodiment, after the gear pair contact spot evaluation card is placed on the working tooth surface of the gear, the contact spot will be compared with the first and second scales of the second region. The comparison value is read and compared with the preset threshold. If the contact spot is ≥A% along the tooth length and ≥B% along the tooth height, it is considered to meet the technical requirements; otherwise, it is considered not to meet the requirements.

[0053] In this embodiment, photo verification and remote video verification can be used to read and compare values, which can improve work efficiency, eliminate misjudgments caused by human factors, and improve the consistency of verification.

[0054] S3: Take a rubbing of the colored contact spots and paste the rubbing results into a pre-designed table (with the same format as the gear pair contact spot evaluation card) for easy reference by both inspection and non-inspection personnel. This also provides data support for subsequent reducer maintenance and repair.

[0055] like Figure 6 As shown, the table has the same format as the gear pair contact spot evaluation card, that is, it marks the length (228.78mm) and width of the first area, the length (34mm) of the first end facet and the second end facet, and the values ​​of the first scale (146mm, 162mm, 178mm, 194mm) and the second scale in the second area, so as to make it easy to refer to at any time.

[0056] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A method of evaluating a gear pair contact pattern inspection, characterized by, Specifically comprising the following steps: S1: obtaining the drawing parameters of the reducer gear, and making a gear pair contact spot evaluation card; S2: coloring the working tooth surface of the gear, and then placing the made gear pair contact spot evaluation card on the working tooth surface of the gear to determine whether the contact spot meets the technical index requirements; if yes, S3 is entered, and if not, assembly adjustment or gear grinding is performed; S3: transferring the colored contact spot, and pasting the transfer result in the table; In the S1, the gear pair contact spot evaluation card comprises a first area, and a first end finish, a second area and a second end finish are sequentially arranged in the first area; a first scale is arranged at the lower end of the second area, and the length of the second area is equally divided into K equal parts; a second scale is arranged at the right end of the second area, and the width of the second area is equally divided into P equal parts; The first scale comprises 50%, 60%, 70%, 80%, 90% and 100%; and the second scale comprises 10%, 20%, 30%, 40% and 50%; The length of the first area is L, and the width is B; the first end finish and the second end finish are respectively located at the left and right sides of the first area, and the length of each is m, and the width of each is B; the length of the second area is L-2m, and the width is B / 2; the distance between the upper end of the second area and the upper end of the first area is B / 4, and the distance between the lower end of the second area and the lower end of the first area is B / 4; In the S2, the step of determining whether the contact spot meets the technical index requirements is: After the gear pair contact spot evaluation card is placed on the working tooth surface of the gear, the contact spot is compared with the first scale and the second scale of the second area, the comparison value is read, and the comparison value is compared with the preset threshold A and B; if the contact spot along the tooth length is greater than or equal to A%, and the contact spot along the tooth height is greater than or equal to B%, it is considered that the technical index requirements are met, otherwise it is considered that the technical index requirements are not met.

2. A method of evaluating gear pair contact pattern inspection according to claim 1, characterized in that, In the S1, the drawing parameters comprise the length L of the working tooth surface in the tooth direction, the length B of the tooth surface involute development, and the length m of the end finish, and m=n%*L.

3. A method of evaluating gear pair contact pattern inspection according to claim 1, wherein The lower end of the first end finish is the grinding starting position, and the upper end is the addendum position.

4. A method of evaluating gear pair contact pattern inspection according to claim 1, wherein In the S1, the material of the gear pair contact spot evaluation card is a plastic plate.

5. A method of evaluating gear pair contact pattern inspection according to claim 1, wherein In the S2, the coloring operation of the working tooth surface of the gear is: A coloring agent is applied to the working tooth surface of the driving gear, then a driving torque is applied to the driving gear, the driving gear drives the driven gear, the driven gear also applies a suitable braking torque, and when the colored tooth surface of the driving gear is fully engaged with the driven gear, the contact spot is formed.

6. A method of evaluating gear pair contact pattern inspection according to claim 1, wherein In the S3, the length and width of the first area, the length of the first end finish and the second end finish, and the first scale and the second scale in the second area are marked in the table.

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