A high-precision manufacturing process for internal and external threads with coaxiality

Abstract

The present invention provides a high-precision manufacturing process method for internal and external threads maintaining coaxiality, comprising: step 1, positioning the first end of a workpiece on a clamping body through an inner hole sleeve, arranging four groups of clamping mechanisms on the outer periphery of the workpiece, applying pressure to the end face of the second end of the workpiece by the four groups of clamping mechanisms arranged on the outer periphery of the workpiece, and pressing and fixing the workpiece; step 2, processing the internal thread in the inner hole of the workpiece; step 3, after the internal thread is processed, disassembling any one group of the clamping mechanisms from the outer periphery of the workpiece and arranging it to the inner hole of the workpiece, repeating the operation to sequentially complete the arrangement of all four groups of clamping mechanisms from the outer periphery to the inner hole, applying pressure to the end face of the second end of the workpiece by the four groups of clamping mechanisms arranged in the inner hole of the workpiece, and pressing and fixing the workpiece; step 4, processing the external thread on the outer wall of the workpiece; step 5, after the external thread is processed, disassembling all four groups of clamping mechanisms and removing the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of thread manufacturing technology, and in particular to a high-precision manufacturing process method for internal and external threads maintaining coaxiality. Background Art

[0002] In mechanical processing, it is sometimes necessary to process threads on both the inner hole and the outer wall of the workpiece. For larger diameter and thinner walled disc-type workpieces (there is no process head left on the blank for clamping), the usual processing steps are: first, use the machine tool jaws to clamp the outer circle of the workpiece to machine the inner thread of the inner hole, then loosen the jaws to remove the workpiece, and then install the workpiece counter-jaws to clamp the inner hole of the workpiece for a second time to machine the outer thread of the outer wall. However, when the inner thread and the outer thread have high coaxiality requirements, there will be considerable difficulties and technical bottlenecks in processing, manufacturing and measurement: first, there are two positioning and installation errors, and the coaxiality cannot be guaranteed; second, the chuck clamping the inner hole or outer circle of the workpiece is prone to deformation of the workpiece, affecting the coaxiality and damaging the workpiece; third, the current measurement technology is difficult to accurately measure the coaxiality of the internal and external threads. Summary of the invention

[0003] The present invention is made to solve the above-mentioned problem, and its purpose is to provide a high-precision manufacturing process method for internal and external threads which can maintain coaxiality.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention provides a high-precision manufacturing process method for internal and external threads with coaxiality maintained, which is characterized by comprising the following steps:

[0006] Step 1, positioning the first end of the workpiece on the clamp body through the inner hole, arranging four sets of clamping mechanisms on the periphery of the workpiece, and applying pressure to the end surface of the second end of the workpiece through the four sets of clamping mechanisms arranged on the periphery of the workpiece, so as to press and fix the workpiece;

[0007] Step 2, start the machine tool to process the internal thread in the inner hole of the workpiece;

[0008] Step 3, after the internal thread processing is completed, the machine tool is stopped, and any one set of the clamping mechanisms is removed from the outer periphery of the workpiece and arranged in the inner hole of the workpiece, and the operation is repeated to sequentially complete the arrangement of all four sets of clamping mechanisms from the outer periphery to the inner hole, and pressure is applied to the end surface of the second end of the workpiece through the four sets of clamping mechanisms arranged in the inner hole of the workpiece, so as to press and fix the workpiece;

[0009] Step 4, starting the machine tool to process external threads on the outer wall of the workpiece;

[0010] Step 5, after the external thread processing is completed, the machine tool stops, and then any one set of the clamping mechanisms is disassembled, and the disassembly operation is repeated to complete the disassembly of all four sets of clamping mechanisms in sequence. After the disassembly of the four sets of clamping mechanisms is completed, the workpiece is removed.

[0011] Furthermore, in the high-precision manufacturing process method for maintaining coaxiality of internal and external threads provided by the present invention, it can also have the following characteristics: wherein, in step 1, the four peripheral arrangement points for arranging the clamping mechanism are evenly distributed in a circular array about the central axis of the clamping body, and the angle formed by two adjacent peripheral arrangement points and the central axis is 90 degrees; in step 3, the four inner hole side arrangement points for arranging the clamping mechanism are evenly distributed in a circular array about the central axis of the clamping body, and the angle formed by two adjacent inner hole side arrangement points and the central axis is 90 degrees.

[0012] Furthermore, in the high-precision manufacturing process method for internal and external threads maintaining coaxiality provided by the present invention, it can also have the following characteristics: wherein each peripheral arrangement point corresponds to an inner hole side arrangement point located on the same radius of the clamp body.

[0013] Furthermore, in the high-precision manufacturing process method for internal and external threads with coaxiality maintained provided by the present invention, the following features may be provided: wherein, in step 3, the order in which the four groups of clamping mechanisms are changed from the outer periphery to the inner hole is:

[0014] First, any set of clamping mechanisms A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius;

[0015] Then, the clamping mechanism B located on the same straight line as the clamping mechanism A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius;

[0016] Then, any one of the remaining two groups of clamping mechanisms C is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius;

[0017] Finally, the remaining set of clamping mechanisms D are disassembled from the outer peripheral arrangement points and arranged at the inner hole side arrangement points on the same radius.

[0018] Function and effect of the present invention:

[0019] 1) The high-precision manufacturing process method for internal and external threads with coaxiality maintained provided by the present invention positions the workpiece by means of a clamping body, and when the clamping body is installed with a clamping member, the clamping member is disassembled and replaced in sequence during the process of switching the workpiece from internal thread processing to external thread processing, and the workpiece is always in a fixed and tightened state, thereby avoiding repeated positioning and installation errors.

[0020] 2) In the high-precision manufacturing process method for internal and external threads with coaxiality maintained provided by the present invention, the clamping mechanism only acts on the end face of the workpiece and does not directly apply force to the inner hole and outer wall thereof, thus avoiding the problem of deformation of the workpiece.

[0021] 3) The high-precision manufacturing process method for internal and external threads that maintain coaxiality of the present invention ensures the coaxiality requirements, and eliminates the complex and difficult coaxiality measurement and detection methods for the subsequent quality inspection steps of the workpiece. This solves the problem that the current measurement technology is difficult to accurately measure the coaxiality of internal and external threads.

[0022] In summary, the high-precision manufacturing process method for internal and external threads maintaining coaxiality of the present invention has the advantages of simple operation, safety, and strong operability, and fills the gap in meeting the high-precision coaxiality requirements of internal and external threads of such workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the installation position of the clamping mechanism when processing the internal thread in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A top view of the machine tool (without showing the machine tool claws);

[0025] Figure 3 yes Figure 2 Cross-sectional view at section HH;

[0026] Figure 4 is a schematic diagram of the installation position of the clamping mechanism when processing external threads in an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 It is a top view (the machine tool claws are not shown);

[0028] Figure 6 yes Figure 5 Cross-sectional view at section GG;

[0029] Figure 7 Schematic diagram of the embodiment of the present invention in which the clamping body is installed in coordination with the main shaft of a machine tool;

[0030] Figure 8 Schematic diagram of the matching installation of the clamping body and the machine tool claw in the embodiment of the present invention;

[0031] Fig. 9 It is a schematic diagram of the clamping mechanism being switched from the outer periphery of the workpiece to the inner hole side in the high-precision manufacturing process method for internal and external threads while maintaining coaxiality in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the technical solutions of the present invention.

[0033] <Example>

[0034] This embodiment provides a high-precision manufacturing process method for internal and external threads with coaxiality maintained, comprising:

[0035] Step 1, position the first end of the workpiece on the clamping body through the inner hole, arrange four groups of clamping mechanisms on the periphery of the workpiece, and apply pressure to the end face of the second end of the workpiece through the four groups of clamping mechanisms arranged on the periphery of the workpiece, so as to press and fix the workpiece.

[0036] Step 2, start the machine tool and process the internal thread in the inner hole of the workpiece. Figure 3 FIG. 5 shows an internal thread 5a machined on a workpiece.

[0037] Step 3, after the internal thread processing is completed, the machine tool stops, and any one set of clamping mechanisms is removed from the outer periphery of the workpiece and arranged to the inner hole of the workpiece. Repeat this operation to complete the arrangement of all four sets of clamping mechanisms from the outer periphery to the inner hole in sequence, and apply pressure to the end face of the second end of the workpiece through the four sets of clamping mechanisms arranged in the inner hole of the workpiece, so as to press and fix the workpiece.

[0038] Step 4, start the machine tool and process the external thread on the outer wall of the workpiece. Figure 6 The external thread 5b machined on the workpiece is shown.

[0039] Step 5, after the external thread processing is completed, the machine tool stops, and then any one set of the clamping mechanisms is disassembled, and the disassembly operation is repeated to complete the disassembly of all four sets of clamping mechanisms in sequence. After the disassembly of the four sets of clamping mechanisms is completed, the workpiece is removed.

[0040] like Figures 1 to 6 As shown, the clamp body 3 used in the method is a disc-shaped structure, which has a first end face and a second end face opposite to each other. The first end face is used to install the clamping mechanism 4 and the workpiece 5, and the second end face is used to cooperate with the machine tool spindle 1 or the machine tool claw 2. Figure 7 As shown, the clamp body 3 is installed on the machine tool body through the machine tool spindle: a spindle connection hole is opened on the second end face of the clamp body 3, and the spindle connection hole includes a positioning hole section 34 and a threaded hole section 35 from the second end face to the inner side. The end of the machine tool spindle 1 is sequentially provided with a positioning structure 11 and an external thread 12. The clamp body 3 is plugged into the machine tool spindle 1 through the spindle connection hole, the positioning hole section cooperates with the positioning structure of the machine tool spindle 1, and the threaded hole section cooperates with the external thread of the machine tool spindle 1 to achieve threaded connection and fixation. Figure 1 , Figure 4 and Figure 8The clamp body 3 shown is installed on the machine tool body through the machine tool jaws 2: the machine tool jaws 2 are matched and clamped on the outer wall of the clamp body 3.

[0041] In this embodiment, in step 1, the first end of the workpiece is inserted into the positioning groove of the positioning boss 31 through the inner hole.

[0042] In this embodiment, the four peripheral arrangement points and the four inner hole side arrangement points for arranging the clamping mechanism are all arranged on the first end surface of the clamp body. Figures 1 to 3 The surface of the positioning boss 31 is evenly distributed with four inner screw holes 32 in a circular array about the axis of the clamp body as the inner hole side arrangement points. Figures 4 to 6 , four outer screw holes 33 are evenly arranged in a circular array on the first end surface about the axis of the clamp body as peripheral arrangement points. The angle formed by two adjacent peripheral arrangement points and the central axis is 90 degrees. The angle formed by two adjacent inner hole side arrangement points and the central axis is 90 degrees. Each peripheral arrangement point corresponds to an inner hole side arrangement point and is located on the same radius of the clamp body.

[0043] In this embodiment, if Figures 1 to 6 As shown, each set of clamping mechanisms includes a first stud 41, a second stud 41', a first support stud 42, a second support stud 42', a pressure plate 43 and a nut 44. Figures 1 to 3 When the workpiece is internally threaded, the workpiece is clamped and fixed by the first stud 41, the first support stud 42, the pressure plate 43 and the nut 44 of the clamping mechanism. Figures 4 to 6 When the workpiece is processed with external threads, the workpiece is clamped and fixed by the second stud 41 ′, the second support stud 42 ′, the pressing plate 43 and the nut 44 of the clamping mechanism.

[0044] The pressure plate 43 rests on the end surface of the second end of the workpiece to press the workpiece. The pressure plate 43 is provided with a pressure plate through hole and a pressure plate screw hole. The first end and the second end of the first stud 41 are both provided with external threads. The second stud 41' has a similar structure to the first stud 41, the difference between the two being that the first stud 41 is longer, and the length difference between the two matches the size of the surface of the boss protruding from the second end surface of the clamp body. The first end of the second stud 41' or the first stud 41 passes through the pressure plate through hole and is threadedly connected to the nut 44. The second end of the second stud 41' is used for threaded connection with the inner screw hole 32. The second end of the first stud 41 is used for threaded connection with the outer screw hole 33.

[0045] The nut 44 is a spherical nut. In this embodiment, the nut 44 is a hexagonal spherical nut. The pressing plate 43 is provided with an arc groove matching the spherical nut at the peripheral area of ​​the pressing plate through hole.

[0046] The first end of the first support stud 42 is provided with an external thread, and the second end of the first support stud 42 is provided with a spherical structure. The second support stud 42' is similar in structure to the first support stud 42. The difference between the second support stud 42' and the first support stud 42 is that the first support stud 42 is longer, and the difference in length between the two matches the size of the surface of the boss protruding from the second end face of the clamp body. The first end of the first support stud 42 or the second support stud 42' is threadedly connected to the screw hole of the pressure plate. When the clamping mechanism is installed on the outside of the workpiece, the second end of the first support stud 42 contacts and abuts against the first end face of the clamp body 3, playing a supporting role; when the clamping mechanism is installed on the inner hole side of the workpiece, the second end of the second support stud 42' first contacts and abuts against the surface of the boss, playing a supporting role.

[0047] The first end surfaces of the first stud 41, the second stud 41', the support stud 42 and the second support stud 42' are all provided with screw slots. The screw slots are selected from any conventional type of screw slots such as cross slots, slots with one side, square hole slots, hexagonal slots, triangular slots, etc. The screw slots are used to cooperate with a slotted screwdriver for operation.

[0048] See also Fig. 9 In this embodiment, in step 3, the order of changing the four groups of clamping mechanisms from the outer periphery to the inner hole is:

[0049] First, any set of clamping mechanisms A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius. A set of clamping mechanisms is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius as follows: the first stud 41, the first support stud 42, the pressure plate 43 and the nut 44 of the clamping mechanism are disassembled from the outer screw hole 33, and then the second stud 41' is used to replace the first stud 41, the second support stud 42' replaces the first support stud 42 and cooperates with the pressure plate 43 and the nut 44 to reinstall the pressure plate at the inner screw hole 32.

[0050] Then, the clamping mechanism B located on the same straight line as the clamping mechanism A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius.

[0051] Then, any one of the remaining two groups of clamping mechanisms C is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius.

[0052] Finally, the remaining set of clamping mechanisms D are disassembled from the outer peripheral arrangement points and arranged at the inner hole side arrangement points on the same radius.

[0053] In this embodiment, the disassembly order of the four clamping mechanisms in step 5 is similar to the order of switching the four clamping mechanisms from the outer periphery to the inner hole in step 3.

[0054] The high-precision manufacturing process method for internal and external threads of the present invention ultimately achieves the completion of the internal and external threads of the workpiece by installing and positioning the workpiece on a machine tool once, avoiding coaxiality errors caused by errors in the two installation and positioning of the workpiece, and ensuring the coaxiality requirements of the internal and external threads from the manufacturing process method, without the need for subsequent coaxiality measurement that is difficult to accurately measure.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision manufacturing process for internal and external threads with coaxiality, characterized in that: The following steps are involved: Step 1, positioning the first end of the workpiece on the clamp body through the inner hole, arranging four sets of clamping mechanisms on the periphery of the workpiece, and applying pressure to the end surface of the second end of the workpiece through the four sets of clamping mechanisms arranged on the periphery of the workpiece, so as to press and fix the workpiece; Step 2, start the machine tool to process the internal thread in the inner hole of the workpiece; Step 3, after the internal thread processing is completed, the machine tool is stopped, and any one set of clamping mechanisms is removed from the outer periphery of the workpiece and arranged to the inner hole of the workpiece, each outer periphery arrangement point corresponds to an inner hole side arrangement point and is located on the same radius of the clamping body, and the operation is repeated to sequentially complete the arrangement of all four sets of clamping mechanisms from the outer periphery to the inner hole, and pressure is applied to the end face of the second end of the workpiece by the four sets of clamping mechanisms arranged in the inner hole of the workpiece, so as to press and fix the workpiece; The order of changing the four clamping mechanisms from the outer periphery to the inner hole is: First, any set of clamping mechanisms A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius; Then, the clamping mechanism B located on the same straight line as the clamping mechanism A is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius; Then, any one of the remaining two groups of clamping mechanisms C is disassembled from the outer peripheral arrangement point and arranged at the inner hole side arrangement point on the same radius; Finally, the remaining set of clamping mechanisms D are disassembled from the outer peripheral arrangement points and arranged at the inner hole side arrangement points on the same radius; Step 4, starting the machine tool to process external threads on the outer wall of the workpiece; Step 5, after the external thread processing is completed, the machine tool is stopped, and then any one set of the clamping mechanisms is disassembled, and the disassembly operation is repeated to complete the disassembly of all four sets of clamping mechanisms in sequence. After the disassembly of the four sets of clamping mechanisms is completed, the workpiece is removed; The clamp body is installed in cooperation with the machine tool spindle or the machine tool jaws, and a spindle connection hole is provided on the second end surface of the clamp body, and the spindle connection hole includes a positioning hole section and a threaded hole section in sequence from the second end surface to the inner side; Each set of clamping mechanisms includes a first stud, a second stud, a first supporting stud, a second supporting stud, a pressing plate and a nut; The pressing plate is used to rest on the end surface of the second end portion of the workpiece to press the workpiece; The first end and the second end of the first stud are both provided with external threads; The first end and the second end of the second stud are both provided with external threads; The first end of the first stud or the second stud passes through the through hole of the pressing plate and is threadedly connected with the nut, the nut is a spherical nut, and the pressing plate is provided with an arc groove matching the spherical nut in the outer peripheral area of ​​the through hole of the pressing plate; The second end of the first stud or the second stud is threadedly connected to the screw hole on the clamp body; The first end of the first support stud is provided with an external thread, and the second end of the first support stud is provided with a spherical structure; The first end of the second support stud is provided with an external thread, and the second end of the second support stud is provided with a spherical structure; When the clamping mechanism is installed on the outside of the workpiece, the first end of the first support stud is threadedly connected to the screw hole of the pressure plate, and the second end of the first support stud contacts and abuts against the first end surface of the clamp body to play a supporting role; When the clamping mechanism is installed on the inner hole side of the workpiece, the first end of the second support stud is threadedly connected to the pressure plate screw hole, and the second end of the second support stud contacts and abuts against the surface of the boss of the clamp body to play a supporting role.

2. The high-precision manufacturing process for internal and external threads with coaxiality maintained according to claim 1, characterized in that: in, In step 1, four peripheral arrangement points for arranging the clamping mechanism are evenly arranged in a circular array about the central axis of the clamp body, and the angle formed by two adjacent peripheral arrangement points and the central axis is 90 degrees; In step 3, four inner hole side arrangement points for arranging the clamping mechanism are evenly distributed in a circular array about the central axis of the clamp body, and the angle formed by two adjacent inner hole side arrangement points and the central axis is 90 degrees.

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