A processing method for arc-shaped window rack

Abstract

The present invention discloses a method for processing an arc-shaped window rack, which solves the technical problem of poor processing accuracy. The method comprises the following steps: S1, calculating the position b of the neutral layer of the rack according to the tooth top height b1, the tooth root height b2 and the formula #imgabs0#; S2, determining the standard tooth pitch P 标准 and non-standard pitch P 非标 ; S3, cutting according to the required size and obtaining a slab; S4, referring to the non-standard pitch P 非标 , a stamping machine is used to form teeth on both sides of the slab. S5, the toothed plate is bent into a U-shape using a die, thereby obtaining a straight rack with a non-standard tooth pitch. S6, the straight rack with a non-standard tooth pitch is bent using a die, thereby obtaining a curved window rack. This invention improves machining accuracy, and when the curved window rack is mated with a gear, it can alleviate jamming, reduce noise, improve transmission efficiency, and extend service life.

Description

Technical Field

[0001] The invention belongs to the technical field of rack processing, and in particular relates to a method for processing an arc-shaped windowed rack. Background Art

[0002] The tooth profile of a straight rack is a straight line rather than an involute, equivalent to a cylindrical gear with an infinite pitch radius. Greenhouse window racks are typically straight or curved, with a U-shaped cross-section. Currently, to simplify manufacturing, the tooth profile of curved racks is typically machined to resemble that of straight racks.

[0003] The existing processing method of the curved window rack is as follows: first, the steel plate is cut according to the demand, and then the steel plate is stamped by a stamping equipment, and the teeth are processed on both sides of the steel plate. Then, the steel plate is folded into a "U" shape using a mold to obtain a straight window rack. Finally, the straight window rack is bent into a curved window rack with a specified radius by a mold to complete the processing.

[0004] However, existing processing methods involve bending a straight rack with a standard tooth pitch into a curved rack. This deformation causes the teeth on the straight rack to converge, resulting in a smaller pitch for the curved rack. Consequently, when the curved rack meshes with the gear, the reduced tooth pitch causes jamming, resulting in loud operating noise, reduced transmission efficiency, and a shortened service life for the curved rack.

[0005] It can be seen from this that the processing method of the arc-shaped window rack in the related art has the disadvantage of poor processing accuracy and needs to be improved. Summary of the Invention

[0006] In order to solve all or part of the above problems, the object of the present invention is to provide a method for processing an arc-shaped window rack, which can improve the processing accuracy.

[0007] The present invention provides a method for processing an arc-shaped window rack, comprising the following steps:

[0008] S1, according to the tooth top height b1, tooth root height b2 and formula Calculate the position b of the neutral layer of the rack;

[0009] S2, determine the standard tooth pitch P 标准 and non-standard pitch P 非标 :

[0010] Draw the center line L of each tooth on the rack 齿中线 , make neutral layer arc L 中弧线 , make the midpoint of each tooth on the gear along its own height direction, and connect multiple midpoints through arcs to get L 齿弧线Each of the tooth center line L 齿中线 With L 齿弧线 The intersection points are all H 标准 , two adjacent H 标准 The spacing between the teeth is the standard pitch P 标准 Each of the tooth center line L 齿中线 and neutral layer arc L 中弧线 The intersection point is H 非标 , two adjacent H 非标 The spacing between them is non-standard pitch P 非标 ;

[0011] S3, cutting the material into the required size and obtaining the slab;

[0012] S4, refer to the non-standard tooth pitch P 非标 , the teeth are processed on both sides of the slab by stamping equipment;

[0013] S5, bending the toothed plate into a U-shape through a die to obtain a straight rack with non-standard tooth pitch;

[0014] S6, a straight rack with non-standard tooth pitch is bent through a mold to obtain an arc-shaped window rack.

[0015] Optionally, in S2, the standard tooth pitch P is calculated according to the rack module m and the formula P=πm. 标准 .

[0016] Optionally, in S2, according to the L 齿弧线 Radius R3, L 中弧线 The radius R2, and the formula Calculation of non-standard tooth pitch P 非标 .

[0017] Optionally, R2 is obtained according to the bending radius R1 of the rack and the formula R2=R1-b.

[0018] Optionally, according to the bending radius R1 of the rack and the formula The R3 is obtained.

[0019] Optionally, in S3, the neutral layer arc L 中弧线 The length H 中弧线 Before and after bending, the arc-shaped window rack is unfolded along the position b of the neutral layer of the rack. The tooth center line L 齿中线 Relative to the neutral layer arc L 中弧线 The position of each adjacent tooth root remains unchanged, and the transition arc L 过渡弧 By connecting the tangent lines, we can get a straight rack with non-standard tooth pitch L 直 , and the straight rack L 直 The length H直 and neutral layer arc L 中弧线 The length H 中弧线 Equal, therefore, the plate cutting length H 长 =H 直 =H 中弧线 .

[0020] Optionally, in S3 , the slab is ground to remove burrs and sharp corners.

[0021] Optionally, in S4, the teeth on both sides of the plate are polished respectively to remove burrs and sharp corners.

[0022] As can be seen from the above technical solution, the processing method of the arc-shaped window rack provided by the present invention has the following advantages:

[0023] This method first calculates the non-standard tooth pitch P 非标 , then according to the non-standard pitch P 非标 Processing straight rack, due to non-standard tooth pitch P 非标 Greater than standard pitch P 标准 , so that there is a margin of bending deformation between two adjacent teeth. When the straight rack is bent, the distance between two adjacent teeth is just the standard tooth pitch P 标准 , thereby improving the processing accuracy of the arc-shaped window rack. Therefore, when the arc-shaped window rack is matched with the gear, the tooth pitch of the arc-shaped window rack is more accurate, making the arc-shaped window rack and the gear better matched, thereby alleviating the jamming phenomenon, reducing noise, improving transmission efficiency, and extending service life.

[0024] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0026] Figure 1 Flowchart of a method for processing an arc-shaped window rack according to an embodiment of the present invention;

[0027] Figure 2 A cross-sectional view of an arc-shaped windowed rack according to an embodiment of the present invention, showing the position of the neutral layer at the tooth root;

[0028] Figure 3 A cross-sectional view of an arc-shaped windowed rack according to an embodiment of the present invention, showing the position of the neutral layer at the tooth top;

[0029] Figure 4 A cross-sectional view of an arc-shaped windowed rack according to an embodiment of the present invention, showing the position of the neutral layer of the rack;

[0030] Figure 5 Schematic diagram of the structure of the arc-shaped window rack in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the state of a slab obtained by cutting during the processing of the arc-shaped window rack in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the state in which the stamping equipment processes the teeth on both sides of the slab during the processing of the arc-shaped window rack in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the state in which the mold bends the plate into a straight rack during the processing of the arc-shaped window rack in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the state in which the mold bends the straight rack into an arc-shaped rack during the processing of the arc-shaped window rack in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other in any manner.

[0036] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 FIG. 1 is an embodiment of the present invention, which discloses a method for processing an arc-shaped window rack, comprising the following steps:

[0037] S1, according to the tooth top height b1, tooth root height b2 and formula Calculate the position b of the neutral layer of the rack;

[0038] S2, determine the standard tooth pitch P 标准 and non-standard pitch P 非标 , and non-standard pitch P 非标 Greater than standard pitch P 标准 ;

[0039] S3, cutting the material into the required size and obtaining the slab;

[0040] S4, refer to non-standard tooth pitch P 非标 , the teeth are processed on both sides of the slab by stamping equipment;

[0041] S5, bending the toothed plate into a U-shape through a die to obtain a straight rack with a non-standard tooth pitch;

[0042] S6, a straight rack with non-standard tooth pitch is bent through a mold to obtain an arc-shaped window rack.

[0043] The processing method of the arc window rack in this embodiment is to calculate the non-standard tooth pitch P 非标 , then according to the non-standard pitch P 非标 Processing straight rack, due to non-standard tooth pitch P 非标 Greater than standard pitch P 标准 , so that there is a margin of bending deformation between two adjacent teeth. When the straight rack is bent, the distance between two adjacent teeth is just the standard tooth pitch P 标准 , thereby improving the processing accuracy of the arc-shaped window rack. Therefore, when the arc-shaped window rack is matched with the gear, the tooth pitch of the arc-shaped window rack is more accurate, making the arc-shaped window rack and the gear better matched, thereby alleviating the jamming phenomenon, reducing noise, improving transmission efficiency, and extending service life.

[0044] During the bending process, the outer layer of the material is stretched and the inner layer is squeezed. There must be a transition layer on the cross section that is neither stretched nor compressed, and the stress is almost zero. This transition layer is called the neutral layer of the material. The neutral layer of the U-shaped part is usually 0.23 to 0.27 meters from the bottom edge. 1 The position is determined by, where b 1 The height from the top of the part to the bottom edge.

[0045] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 As shown in the figure, since the height of the tooth root is b1, the position of the neutral layer at the rack tooth root is (0.23~0.27)b1, and the height of the tooth top is b2, the position of the neutral layer at the rack tooth top is (0.23~0.27)b2. Therefore, the position b of the rack center layer is the middle value between the positions of the neutral layer at the tooth root and the tooth top, that is,

[0046] In one embodiment, Figure 5 As shown, in S2, make the center line L of each tooth on the rack 齿中线 , make neutral layer arc L 中弧线 , make the midpoint of each tooth on the gear along its own height direction, and connect multiple midpoints through arcs to get L 齿弧线 .

[0047] In one embodiment, Figure 5 As shown, each tooth center line L 齿中线 With L 齿弧线 The intersection points are all H 标准 , and two adjacent H 标准The spacing between the teeth is the standard pitch P 标准 Each tooth center line L 齿中线 and neutral layer arc L 中弧线 The intersection point is H 非标 , two adjacent H 非标 The spacing between them is non-standard pitch P 非标 .

[0048] In one embodiment, Figure 5 As shown, the standard tooth pitch P can be calculated based on the rack module m and the formula P = πm 标准 According to the bending radius R1 of the rack and the formula R2 = R1-b, L can be obtained. 中弧线 The radius R2, and then according to the bending radius R1 of the rack and the formula You can get L 齿弧线 The radius R3. Then, according to the formula The non-standard pitch P can be calculated 非标 .

[0049] In one embodiment, Figure 5 As shown, in S3, due to the neutral layer arc L 中弧线 The length H 中弧线 It remains consistent before and after bending. Therefore, when the arc-shaped window rack is unfolded along the position b of the neutral layer of the rack, the tooth center line L 齿中线 Relative to the neutral layer arc L 中弧线 The position of each adjacent tooth root is kept unchanged. 过渡弧 By connecting the tangent lines, we can get a straight rack with non-standard tooth pitch L 直 , and the straight rack L 直 The length H 直 and neutral layer arc L 中弧线 The length H 中弧线 Equal, therefore, the plate cutting length H 长 =H 直 =H 中弧线 At the same time, the blanking width of the plate is calculated based on the width of the part and the height of the tooth top (add the height of the two tooth tops and the width of the part, and then subtract the repeated superposition value of the bent part of the part to obtain the blanking width of the plate).

[0050] In one embodiment, in S3, after the blank is cut, the slab is ground to remove burrs and sharp corners. In S4, after the punching equipment processes the tooth profiles on both sides of the slab, the tooth profiles on both sides of the slab are ground separately to remove burrs and sharp corners.

[0051] The processing method of the arc-shaped window rack in this embodiment is specifically exemplified as follows: Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown:

[0052] For example, the arc length of the part is 1080mm, the gear module m is 4, the width is 25.5mm, the tooth root height b1 is 22mm, the tooth top height b2 is 30mm, and the bending radius R1 is 1000mm.

[0053] First, calculate the position b of the center layer of the rack: Since the center layer position of the tooth root is 0.25b1=5.5mm, and the center layer position of the tooth top is 0.25b2=7.5mm, therefore, b=(0.25b1+0.25b2) / 2=6.5mm, the position of the center layer of the rack is 6.5mm away from the bottom edge.

[0054] Then, calculate the standard pitch P according to the formula P = πm 标准 , therefore, the standard pitch P 标准 =4π=12.566mm. According to the formula R2=R1-b, calculate L 中弧线 The radius R2 = 993.5 mm, and then according to Calculate L 齿弧线 The radius R3 = 974 mm. Then, according to the formula Calculate P 非标 =12.81mm.

[0055] Since the neutral layer arc L 中弧线 The length H 中弧线 =1080mm, according to the position of the neutral layer of the rack, the center line of the tooth shape L 齿中线 Relative to the neutral layer arc L 中弧线 The position of each adjacent tooth root remains unchanged, and the transition arc L 过渡弧 By connecting the tangent lines, we can get a straight rack with non-standard tooth pitch L 直 , and the straight rack L 直 The length H 直 and neutral layer arc L 中弧线 The length H 中弧线 Equal, therefore, the plate cutting length H 长 =H 直 =H 中弧线 =1080mm. For tooth top height b2 = 30mm and part width 25.5mm, we can calculate that the sheet blank width is approximately 76.5mm. Therefore, the size of the slab is 1080mm × 76.5mm.

[0056] Subsequently, the slab is ground and fed into the stamping equipment, which then presses the slab according to the non-standard tooth pitch P. 非标, tooth shapes are processed on both sides of the slab, and then the tooth shapes on both sides of the plate are polished by polishing equipment.

[0057] Next, the toothed sheet is bent into a U-shape using a die or a bending machine, resulting in a straight rack with a non-standard tooth pitch. Finally, the straight rack is bent into a curved window rack with a radius of R1 = 1000mm using a die or a bending machine, completing the production of a curved window rack with a standard tooth pitch.

[0058] From the above process, it can be seen that this method can improve the processing accuracy of the arc-shaped window rack. When the arc-shaped window rack is matched with the gear, the tooth pitch of the arc-shaped window rack is more accurate, which makes the arc-shaped window rack and the gear better matched, thereby alleviating the jamming phenomenon, reducing noise, improving transmission efficiency and extending service life.

[0059] It should be noted that, unless otherwise specified, the technical or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0060] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for processing an arc-shaped window rack, characterized in that: The steps include: S1, according to the tooth top height b1, tooth root height b2 and formula B= Calculate the position b of the neutral layer of the rack; S2, determine the standard tooth pitch P 标准 and non-standard pitch P 非标 : Draw the center line L of each tooth on the rack 齿中线 , make neutral layer arc L 中弧线 , make the midpoint of each tooth on the gear along its own height direction, and connect multiple midpoints through arcs to get L 齿弧线 During the bending process, the outer layer of the material is stretched and the inner layer is squeezed, forming a transition layer on its cross section that is neither stretched nor compressed. This transition layer is the neutral layer of the material. Each tooth profile center line L 齿中线 With L 齿弧线 The intersection points are all H 标准 , two adjacent H 标准 The spacing between the teeth is the standard pitch P 标准 Each of the tooth center line L 齿中线 and neutral layer arc L 中弧线 The intersection point is H 非标 , two adjacent H 非标 The spacing between them is non-standard pitch P 非标 ; S3, cutting the material into the required size and obtaining the slab; S4, refer to the non-standard tooth pitch P 非标 , the teeth are processed on both sides of the slab by stamping equipment; S5, bending the toothed plate into a U-shape through a die to obtain a straight rack with a non-standard tooth pitch; S6, a straight rack with non-standard tooth pitch is bent through a mold to obtain an arc-shaped window rack.

2. The method for processing an arc-shaped window rack according to claim 1, characterized in that: In S2, the standard pitch P is calculated according to the rack module m and the formula P=πm. 标准 .

3. The method for processing an arc-shaped window rack according to claim 1, characterized in that: In S2, according to the L 齿弧线 Radius R3, L 中弧线 The radius R2, and the formula Calculation of non-standard tooth pitch P 非标 .

4. The method for processing an arc-shaped window rack according to claim 3, characterized in that: According to the bending radius R1 of the rack and the formula R2=R1-b, the R2 is obtained.

5. The method for processing an arc-shaped window rack according to claim 3, characterized in that: According to the bending radius R1 of the rack and the formula R3=R1-(b2+ ), and the R3 is obtained.

6. The method for processing an arc-shaped window rack according to claim 1, characterized in that: In S3, the neutral layer arc L 中弧线 The length H 中弧线 Before and after bending, the arc-shaped window rack is unfolded along the position b of the neutral layer of the rack. The tooth center line L 齿中线 Relative to the neutral layer arc L 中弧线 The position of each adjacent tooth root remains unchanged, and the transition arc L 过渡弧 By connecting the tangent lines, we can get a straight rack with non-standard tooth pitch L 直 , and the straight rack L 直 The length H 直 and neutral layer arc L 中弧线 The length H 中弧线 Equal, therefore, the plate cutting length H 长 =H 直 =H 中弧线 .

7. The method for processing an arc-shaped window rack according to claim 1, characterized in that: In S3, the slab is ground to remove burrs and sharp corners.

8. The method for processing an arc-shaped window rack according to claim 1, characterized in that: In S4, the tooth profiles on both sides of the plate are ground separately to remove burrs and sharp corners.

Images