Sawtooth thread machining process

Abstract

The invention relates to a thread manufacturing process, in particular to a sawtooth thread machining process. Comprising the following process steps: S1, selecting a cutter; s2, positioning an initial point A; s3, rough turning; s4, finish turning; and S5, the remaining threads are cut. The grooving cutter which is relatively simple in manufacturing process is adopted to replace a forming cutter to serve as a sawtooth thread machining tool, the requirement for machining precision of sawtooth threads can be met, and by optimizing cutting parameters, the machining efficiency can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] The invention relates to a process for making a thread, in particular to a process for making a sawtooth thread. Background Art

[0002] In the current technological context, as a heavy-duty mechanical equipment, the structural stability and connection reliability of the press are of vital importance. In particular, in the connection between the column and the column nut of the press, a 45° sawtooth thread connection of the water system is usually used to enhance the tightness and load-bearing capacity of the connection. This connection method improves the load-bearing capacity and sealing performance of the press, and also optimizes the transmission efficiency of the equipment.

[0003] However, when manufacturing this kind of 45° serrated thread for water systems, traditional processing methods mainly rely on forming blades. Although forming blades have a certain application basis in the field of thread processing, their inherent limitations are becoming increasingly prominent. Specifically, forming blades generally have the problem of insufficient strength, which causes the blades to easily wear during the processing process, thus affecting the processing accuracy and efficiency. In addition, the number of molds for forming blades is large, which increases production costs and limits their versatility in processing threads of different specifications. More importantly, due to the complex production process of forming blades and limited market demand, their prices are relatively expensive, further increasing the production costs of enterprises.

[0004] The present invention proposes to use a grooving cutter as a thread processing tool, which has attracted much attention due to its high strength, good wear resistance and wide versatility. The grooving cutter can not only meet the processing accuracy requirements of the 45° serrated thread of the water system, but also improve the processing efficiency and reduce the production cost by optimizing the cutting parameters. In addition, the manufacturing process of the grooving cutter is relatively simple and the production cost is low, which helps to further reduce the overall cost of thread processing. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a sawtooth thread processing technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a sawtooth thread processing process, comprising the following process steps: S1. Select tool; S2, locate the initial point A; S3, rough turning; S4, finishing turning; S5. Cut the remaining threads.

[0007] Furthermore, in said S1, a tool is selected according to the tooth bottom width e and the tooth bottom fillet radius r of the sawtooth thread, and a tool with a tool width B less than or equal to the tooth bottom width e and a tool tip fillet radius R less than the tooth bottom fillet radius r is selected.

[0008] Furthermore, in S2, the intersection of the tooth top and the left side of the first thread is set as the initial point A, the tangent point between the left rounded corner of the tool tip and the left side of the sawtooth thread is found, and the tangent point is made to coincide with the initial point A to complete the positioning of the initial point A.

[0009] Furthermore, in S3-S5, the tool back cutting depth is set to , the height of the sawtooth thread is h, the number of radial cutting is n, , n is an integer, and the total number of radial cutting is n+1; The S3 includes: S31, cutting the first layer; S32, cutting the second layer; S33, cutting the third layer; ...... And so on. S3n, cutting the nth layer; S3n+1, cutting the n+1th layer.

[0010] Furthermore, in said S3-S5, it also includes setting the tool feed amount to f and the angle between the left side surface and the tooth bottom plane to θ; In S31, the total axial cutting length of the first layer is L1, the number of axial feeds of the first layer is N1, , N1 is an integer, and the total number of axial feeds of the first layer is N1+1. Starting from the initial point A, after cutting N1 times to the right along the axial direction with a feed rate f, the cutting length l1 of the first layer is measured and the feed rate f1 of the N1+1th cutting is adjusted to complete the cutting of the first layer, f1=L1-l1; In S32, the total axial cutting length of the second layer is L2, and the number of axial feeds of the second layer is N2. , N2 is an integer, and the total number of axial feeds in the second layer is N2+1. Starting from the initial point A, move downward radially by a back cutting amount. , axial movement to the right Position at the starting point B of the second layer, cut N2 times to the right along the axial direction with a feed rate f, measure the cut length l2 of the second layer and adjust the feed rate f2 of the N2+1th cut to complete the cutting of the second layer, f2=L2-l2; In S33, the total axial cutting length of the third layer is L3, and the number of axial feeds of the third layer is N3. , N3 is an integer, and the total number of axial feeds in the third layer is N3+1. Starting from the starting point B of the second layer, move downward radially by a back cutting amount. , axial movement to the right Position at the starting point C of the third layer, cut N3 times to the right along the axial direction with a feed rate f, measure the cut length l3 of the third layer and adjust the feed rate f3 of the N3+1th cut to complete the cutting of the third layer, f3=L3-l3; ...... And so on, until the cutting of the nth layer is completed.

[0011] Furthermore, the S3n+1 includes the n+1th layer with a total axial cutting length of L n+1 , the number of axial feeds for the n+1th layer is N n+1 , , N n+1 Take the integer and get the total number of axial feeds for the n+1th layer as N. n+1 +1; The S3n+1 also includes measuring the cutting height h1 of the 1st to nth layers and adjusting the back cutting amount of the n+1th layer. , ; Starting from the starting point of the nth layer, move radially downward by a back cutting amount , axial movement to the right Position to the starting point of the n+1th layer, and cut N to the right along the axial direction at a feed rate of f n+1 After that, measure the cutting length l of the n+1th layer n+1 And adjust the Nth n+1 +1 cutting feed f n+1 After the cutting of the n+1th layer is completed, f n+1 =L n+1 -l n+1 .

[0012] Furthermore, the step S4 includes reducing the back cutting amount. to Repeat S1-S3 to reduce the back cutting amount again to , repeat S1-S3; and so on, until the left side, right side, tooth bottom fillet and chamfer steps are cut and the finish turning is completed.

[0013] Furthermore, the tool in S1 is a grooving tool.

[0014] Further, the S5 includes S51, positioning the tool to an initial point A of the first thread; S52, move the tool axially to the right by a pitch of t to the starting point of the second thread ; S53, repeat S3-S4 to complete the cutting of the second thread; S54, repeat S51-S53 to complete the cutting of the third thread and complete the cutting of all threads in this cycle.

[0015] Further, the pitch t in S52 is a fixed value or a non-fixed value.

[0016] Compared with the prior art, the present invention has the following advantages: 1. Use grooving knives instead of forming blades to reduce production costs; 2. The grooving tool has high strength and good wear resistance, is not easy to wear during cutting, and improves the processing accuracy and tool life; 3. Simple operation, can improve processing efficiency by optimizing cutting parameters; 4. High versatility, suitable for processing serration threads of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a tool in the present invention; Figure 2 It is a schematic diagram of the sawtooth thread in the present invention; In the figure: 1, left side, 2, right side, 3, tooth bottom plane, 4, chamfer. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1, as Figure 1 and Figure 2 As shown, a sawtooth thread processing process includes the following process steps: S1. Select tool; S2, locate the initial point A of the first thread; S3, rough turning; S4, finishing turning; S5. Cut the remaining threads.

[0020] In the above S1, a tool is selected according to the tooth bottom width e and the tooth bottom fillet radius r of the sawtooth thread, and a tool with a tool width B less than or equal to the tooth bottom width e and a tool tip fillet radius R less than the tooth bottom fillet radius r is selected to ensure that the selected tool can cut the tooth bottom of the sawtooth thread. The selected tool is installed on the lathe tool disk, and the workpiece to be cut is installed on the lathe spindle to complete the preparation work before cutting.

[0021] In this embodiment, the blade width B is set to 3 mm, the tooth bottom width e is set to 3.4 mm, the blade tip fillet radius R is set to 0.4 mm, and the tooth bottom fillet radius r is set to 0.8 mm.

[0022] Embodiment 2, as Figure 2 As shown, in S2, the intersection of the tooth top of the first thread and the left side surface 1 is set as the initial point A, the tangent point of the left rounded corner of the tool tip and the left side surface 1 of the sawtooth thread is found, and the tangent point is made to coincide with the initial point A to complete the positioning of the initial point A.

[0023] In the above S2, the intersection of the tooth top of the first thread and the left side surface 1 is set as the initial point A, the tangent point of the left rounded corner of the tool tip and the left side surface 1 of the sawtooth thread is found, and the tangent point is made to coincide with the initial point A to complete the positioning of the initial point A.

[0024] Set the tool back cutting amount to , the height of the sawtooth thread is h, the number of radial cutting is n, , n is an integer, and the total number of radial cutting is n+1; The S3 includes: S31, cutting the first layer; S32, cutting the second layer; S33, cutting the third layer; ...... And so on. S3n, cutting the nth layer; S3n+1, cutting the n+1th layer.

[0025] In this embodiment, the back cutting amount a p It can be adjusted according to the design parameters of the sawtooth thread. When the calculation result of the radial cutting number n is not an integer, n is taken as an integer, and the total number of radial cutting is n+1; when the calculation result of the radial cutting number n is exactly an integer, the total number of radial cutting is n.

[0026] In this embodiment, the back cutting amount is set is 0.1mm, the sawtooth thread height h is 6mm, then the radial cutting times At this time, the calculated result of the number of cutting times n is exactly an integer, so the total number of radial cutting times is 60 times. The S3 includes: S31, cutting the first layer; S32, cutting the second layer; S33, cutting the third layer; ...... And so on. S360, cutting the 60th layer.

[0027] Embodiment 3, based on Embodiment 2 and Embodiment 3, said S3 further includes setting the tool feed amount to f, and the angle between the left side surface 1 and the tooth bottom plane 3 to θ; In S31, the total axial cutting length of the first layer is L1, the number of axial feeds of the first layer is N1, , N1 is an integer, and the total number of axial feeds of the first layer is N1+1. Starting from the initial point A, after cutting N1 times to the right along the axial direction with a feed rate f, the cutting length l1 of the first layer is measured and the feed rate f1 of the N1+1th cutting is adjusted to complete the cutting of the first layer, f1=L1-l1; In S32, the total axial cutting length of the second layer is L2, and the number of axial feeds of the second layer is N2. , N2 is an integer, and the total number of axial feeds in the second layer is N2+1. Starting from the initial point A, move downward radially by a back cutting amount. , axial movement to the right Position the second layer at the starting point B, cut N2 times to the right along the axial direction with a feed rate f, measure the cut length l2 of the second layer, and adjust the feed rate f2 of the N2+1th cut to complete the cutting of the second layer, f2=L2-l2; In S33, the total axial cutting length of the third layer is L3, and the number of axial feeds of the third layer is N3. , N3 is an integer, and the total number of axial feeds in the third layer is N3+1. Starting from the starting point B of the second layer, move downward radially by a back cutting amount. , axial movement to the right Position at the starting point C of the third layer, cut N3 times to the right along the axial direction with a feed rate f, measure the cut length l3 of the third layer and adjust the feed rate f3 of the N3+1th cut to complete the cutting of the third layer, f3=L3-l3; ...... And so on, until the cutting of the nth layer is completed.

[0028] S3n+1 includes the n+1th layer with a total axial cutting length of L n+1 , the number of axial feeds for the n+1th layer is N n+1 , , N n+1 Take the integer and get the total number of axial feeds for the n+1th layer as N. n+1 +1; The S3n+1 also includes measuring the cutting height h1 of the 1st to nth layers and adjusting the back cutting amount of the n+1th layer. , ; Starting from the starting point of the nth layer, move radially downward by a back cutting amount , axial movement to the right Position to the starting point of the n+1th layer, and cut N to the right along the axial direction at a feed rate of f n+1 After that, measure the cutting length l of the n+1th layer n+1 And adjust the Nth n+1 +1 cutting feed f n+1 After the cutting of the n+1th layer is completed, f n+1 =L n+1 -l n+1 .

[0029] In this embodiment, when the axial feeding times of the first layer are N1, the axial feeding times of the second layer are N2, and the axial feeding times of the n+1th layer are N n+1 When the calculation result is not an integer, N1, N2, ... N n+1 Take the integer and get the total number of axial feeds for the first layer is N1+1, the total number of axial feeds for the second layer is N2+1... the total number of axial feeds for the n+1th layer is N n+1 +1; when the first layer axial feed times N 1、 The axial feed times of the second layer are N2...The axial feed times of the n+1th layer are N n+1 When the calculation result is an integer, the total number of axial feeds for the first layer is N1, the total number of axial feeds for the second layer is N2, and the total number of axial feeds for the n+1th layer is N. n+1 .

[0030] In order to ensure the cutting quality of each axial feed, the feed rate f must satisfy 0<f≤B-2R.

[0031] In this embodiment, based on the embodiment 2 and the embodiment 3, the step S3 further includes setting the tool feed amount f to 2 mm, the angle θ to 135°, and the first layer cut length l 1、 The second layer has cut length l 2、 The measured value of the cut length l3 of the third layer is 9 mm.

[0032] Assuming the total axial cutting length L1 of the first layer is 10.4 mm, the number of axial feeds of the first layer is , N1 is taken as an integer of 3, and the total number of axial feeds for the first layer is 4 times. Starting from the initial point A, after cutting 3 times to the right along the axial direction with a feed rate of f=2mm, the cut length l1 of the first layer is measured to be 9mm, and the feed rate of the fourth cutting is adjusted to f1=L1-l1=10.4-9=1.4mm to complete the cutting of the first layer; Assuming the total axial cutting length L2 of the second layer is 10.2 mm, the number of axial feeds of the second layer is , N2 is taken as an integer of 3, and the total number of axial feeds in the second layer is 4 times. Starting from the initial point A, move downward radially by a back cutting amount , axial movement to the right Position at the starting point B of the second layer, cut rightward along the axial direction three times with a feed rate of f=2mm, measure the cut length l2 of the second layer to be 9mm, and adjust the feed rate f2=L2-l2=10.2-9=1.2mm for the fourth cut to complete the cutting of the second layer; Assuming the total axial cutting length L3 of the third layer is 10 mm, the number of axial feeds of the third layer is , N3 is taken as an integer of 3, and the total number of axial feeds in the third layer is 4 times. Starting from the starting point B of the second layer, move downward radially by a back cutting amount , axial movement to the right Position at the starting point C of the third layer, cut rightward along the axial direction three times with a feed rate of f=2mm, measure the cut length l3 of the third layer to be 9mm, and adjust the feed rate of the fourth cut to f3=L3-l3=10-9=1mm to complete the cutting of the third layer; ...... And so on, until the 60th layer of cutting is completed, that is, the rough turning is completed.

[0033] Embodiment 4, said S4 includes reducing the back cutting amount to Repeat S1-S3 to reduce the back cutting amount again to , repeat S1-S3; and so on, until the steps of the left side 1, the right side 2, the tooth bottom fillet and the chamfer 4 are cut and the finish turning is completed.

[0034] The tool in S1 is a grooving tool.

[0035] In this embodiment, the grooving cutter is used as the tool, considering that the grooving cutter has low cost, high strength, good wear resistance, is not easy to wear during cutting, can improve processing accuracy and extend the service life of the tool. If there are other rounded corner tools with lower cost and better performance, the serrated thread can also be cut according to the process steps of the present invention.

[0036] Embodiment 5, the S5 includes S51, positioning the tool to the initial point A of the first thread; S52, move the tool axially to the right by a pitch of t to the starting point of the second thread ; S53, repeat S3-S4 to complete the cutting of the second thread; S54, repeat S51-S53 to complete the cutting of the third thread and complete the cutting of all threads in this cycle.

[0037] The pitch t in S52 can be a fixed value or a non-fixed value. When the pitch t is a fixed value, it is suitable for cutting equidistant sawtooth threads; when the pitch t is a non-fixed value, it is suitable for cutting variable pitch sawtooth threads, and the pitch t can be adjusted multiple times according to the sawtooth thread design parameters.

[0038] 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 sawtooth thread processing process, characterized in that: The process steps include: S1. Select tool; S2, locate the initial point A; S3, rough turning; S4, finishing turning; S5. Cut the remaining threads.

2. A sawtooth thread processing process according to claim 1, characterized in that: In the above S1, a tool is selected according to the tooth bottom width e and the tooth bottom fillet radius r of the sawtooth thread, and a tool with a tool width B less than or equal to the tooth bottom width e and a tool tip fillet radius R less than the tooth bottom fillet radius r is selected.

3. A sawtooth thread processing process according to claim 1, characterized in that: In the above-mentioned S2, the intersection of the tooth top of the first thread and the left side surface (1) is set as the initial point A, the tangent point between the left rounded corner of the tool tip and the left side surface (1) of the sawtooth thread is found, and the tangent point is made to coincide with the initial point A, thereby completing the positioning of the initial point A.

4. A sawtooth thread processing process according to claim 1, characterized in that: In S3-S5, the tool back cutting depth is set to , the height of the sawtooth thread is h, the number of radial cutting is n, , n is an integer, and the total number of radial cutting is n+1; The S3 includes: S31, cutting the first layer; S32, cutting the second layer; S33, cutting the third layer; ...... And so on. S3n, cutting the nth layer; S3n+1, cutting the n+1th layer.

5. A sawtooth thread processing process according to claim 4, characterized in that: In the above-mentioned S3-S5, the tool feed rate is set to f, and the angle between the left side surface (1) and the tooth bottom plane (3) is set to θ; In S31, the total axial cutting length of the first layer is L1, the number of axial feeds of the first layer is N1, , N1 is an integer, and the total number of axial feeds of the first layer is N1+1. Starting from the initial point A, after cutting N1 times to the right along the axial direction with a feed rate f, the cutting length l1 of the first layer is measured and the feed rate f1 of the N1+1th cutting is adjusted to complete the cutting of the first layer, f1=L1-l1; In S32, the total axial cutting length of the second layer is L2, and the number of axial feeds of the second layer is N2. , N2 is an integer, and the total number of axial feeds in the second layer is N2+1. Starting from the initial point A, move downward radially by a back cutting amount. , axial movement to the right Position at the starting point B of the second layer, cut N2 times to the right along the axial direction with a feed rate f, measure the cut length l2 of the second layer and adjust the feed rate f2 of the N2+1th cut to complete the cutting of the second layer, f2=L2-l2; In S33, the total axial cutting length of the third layer is L3, and the number of axial feeds of the third layer is N3. , N3 is an integer, and the total number of axial feeds in the third layer is N3+1. Starting from the starting point B of the second layer, move downward radially by a back cutting amount. , axial movement to the right Position at the starting point C of the third layer, cut N3 times to the right along the axial direction with a feed rate f, measure the cut length l3 of the third layer and adjust the feed rate f3 of the N3+1th cut to complete the cutting of the third layer, f3=L3-l3; ...... And so on, until the cutting of the nth layer is completed.

6. A sawtooth thread processing process according to claim 4, characterized in that: S3n+1 includes the n+1th layer with a total axial cutting length of L n+1 , the number of axial feeds for the n+1th layer is N n+1 , , N n+1 Take the integer and get the total number of axial feeds for the n+1th layer as N. n+1 +1; The S3n+1 also includes measuring the cutting height h1 of the 1st to nth layers and adjusting the back cutting amount of the n+1th layer. , ; Starting from the starting point of the nth layer, move radially downward by a back cutting amount , axial movement to the right Position to the starting point of the n+1th layer, and cut N to the right along the axial direction at a feed rate of f n+1 After that, measure the cutting length l of the n+1th layer n+1 And adjust the Nth n+1 +1 cutting feed f n+1 After the cutting of the n+1th layer is completed, f n+1 =L n+1 -l n+1 .

7. A sawtooth thread processing process according to claim 1, characterized in that: S4 includes reducing the back cutting amount to , repeat S1-S3; reduce the back cutting amount again to , repeat S1-S3; and so on, until the left side (1), right side (2), tooth bottom fillet and chamfer (4) steps are cut and the finish turning is completed.

8. A sawtooth thread processing process according to claim 2, characterized in that: The tool in S1 is a grooving tool.

9. A sawtooth thread processing process according to claim 1, characterized in that: The S5 includes S51, positioning the tool to the initial point A of the first thread; S52, move the tool axially to the right by a pitch of t to the starting point of the second thread ; S53, repeat S3-S4 to complete the cutting of the second thread; S54, repeat S51-S53 to complete the cutting of the third thread and complete the cutting of all threads in this cycle.

10. A sawtooth thread processing process according to claim 9, characterized in that: The pitch t in S52 is a fixed value or a non-fixed value.

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