High-precision numerical control wire drawing machine

Abstract

The application discloses a high-precision numerical control thread rolling machine and relates to the technical field of thread processing, which solves the problems of low machining precision and difficulty in adjusting the angle of a thread rolling plate of an existing thread rolling machine. The thread rolling machine comprises a left thread rolling die, a right thread rolling die, a feeding mechanism, a heating mechanism and a feeding mechanism. The left thread rolling die comprises a first thread rolling plate, a taper adjusting mechanism for controlling the deflection of the first thread rolling plate around a vertical shaft. The right thread rolling die comprises a second thread rolling plate, a parallelism adjusting mechanism for controlling the deflection of the second thread rolling plate around a horizontal shaft, and a spacing adjusting mechanism for controlling the approach or distance of the second thread rolling plate to the first thread rolling plate. The opposite surfaces of the first thread rolling plate and the second thread rolling plate are provided with a plurality of teeth, and the teeth extend along the surfaces of the first thread rolling plate and the second thread rolling plate. In the application, the two thread rolling plates can be synchronously moved towards each other up and down, and the angle is adjustable, so that the parallelism between the first thread rolling plate and the second thread rolling plate can be ensured, and the machining precision is improved.

Description

Technical Field

[0001] This invention relates to the field of thread processing technology, and in particular to a high-precision CNC thread rolling machine. Background Technology

[0002] Thread rolling machines are specialized equipment for processing threads. Currently, the metallographic qualification rate of aviation threads, especially titanium alloy threads, processed using domestically produced traditional thread rolling machines is very low. That is, regardless of whether the material is imported Ti6AL4V or domestically produced TC4, all domestically produced thread rolling machines cannot meet the processing requirements for titanium alloy aviation threads. Specifically, this manifests in two ways: 1. Metallographic defects; 2. Irregular dimensional deviations.

[0003] The reason why it cannot meet the processing requirements is that the plasticity of titanium alloy after solution heat treatment is very low. The prerequisite for the thread rolling of aerospace titanium alloy with memory springback characteristics is that the plasticity of the metal must meet the basic requirements of thread rolling when the metal grains slip. As mentioned earlier, aerospace titanium alloy bolts must be rolled after solution heat treatment. After heat treatment, the elongation of the material, especially the elongation of titanium alloy, will be significantly reduced. Then the metal grains will have difficulty in the process of thread rolling and slip, resulting in metal accumulation, i.e., folding. Under this condition, the thread lines of the two thread rolling dies must be very accurate. The line pressed by the left thread rolling die on the blank must coincide with the line pressed by the right thread rolling die on the blank. According to the actual application test data of a large number of aerospace fastener manufacturers, the error of thread overlap is required to be within one thread. If it exceeds one thread, coupled with the extremely poor plasticity of the material (less than 12%), it will directly lead to thread folding (i.e., metallographic failure).

[0004] For aerospace-grade materials like titanium alloys, which have relatively low elongation, the threading must be extremely precise, and the two thread rolling plates must maintain an error of less than 1 micrometer throughout the mass production process.

[0005] When existing traditional thread rolling machines use thread rolling plates to process the external threads of threaded parts (such as the external threads of bolts or screws), the thread rolling machine drives one of the thread rolling plates to reciprocate through a crank-connecting rod mechanism. The two thread rolling plates are stationary and moving. The traditional crank-connecting rod mechanism converts the rotation of the motor into the linear reciprocating motion of the slide carrying the thread rolling plate. Finally, the threads on the thread rolling plate are used to roll the thread teeth on the workpiece or structure to form the external thread, as shown in the thread rolling machine with publication number CN107649627B.

[0006] Existing traditional thread rolling machines have several significant drawbacks: 1. The large clearance between the crank and connecting rod, including the large return clearance of the entire transmission chain, causes the workpiece thread lines to change irregularly during production, resulting in very poor accuracy in maintaining the relative thread lines between the two thread rolling dies; 2. The flywheel inertia of the connecting crank and connecting rod is too large, and there is no process angle control unit, making the precise thread alignment process extremely difficult and resulting in large repeatability errors; 3. The adjustment of the thread rolling die spacing, taper, and parallelism in traditional thread rolling machines is still done manually using traditional purely mechanical methods. Specifically, the spacing, parallelism, and taper of the thread rolling dies are all manually adjusted using four large bolts. When adjusted individually, these bolts affect each other, easily leading to inconsistent results each time. This makes it impossible to guarantee the consistency of the processed dimensions, resulting in a large waste of aerospace material blanks for equipment adjustments. However, aerospace fastener blanks are expensive, and the large amount of waste leads to significant losses. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned problems by designing a high-precision CNC thread rolling machine, which solves the problems of low processing accuracy and difficulty in adjusting the angle of the thread rolling plate in existing thread rolling machines.

[0008] The technical solution of the present invention to achieve the above objectives is a high-precision CNC wire rolling machine, comprising:

[0009] A left thread rolling die and a right thread rolling die, wherein the left thread rolling die and the right thread rolling die are arranged opposite each other and can move synchronously up and down towards each other;

[0010] The feeding mechanism is used to convey the blanks one by one to the designated position;

[0011] Heating mechanism, used for induction heating of the billet;

[0012] The feeding mechanism is used to pick up the billet from the outlet of the feeding mechanism, heat it through the heating mechanism, and then transfer it to the angle formed between the left and right thread rolling dies.

[0013] The left thread rolling die includes a first thread rolling plate and a taper adjustment mechanism for controlling the first thread rolling plate to deflect around a vertical axis;

[0014] The right thread rolling die includes a second thread rolling plate, a parallelism adjustment mechanism for controlling the second thread rolling plate to deflect around a horizontal axis, and a spacing adjustment mechanism for controlling the second thread rolling plate to move closer to or further away from the first thread rolling plate.

[0015] The opposing surfaces of the first and second thread rolling plates have a plurality of teeth adapted to the shape and helix angle of the thread being processed. The teeth extend along the surfaces of the first and second thread rolling plates, and the processing space is formed between the first and second thread rolling plates.

[0016] Furthermore, the thread rolling machine also includes:

[0017] The machine body is integrally cast and has a through-type installation space in the middle. A bed is provided on both sides of the installation space. The left thread rolling die and the right thread rolling die are slidably connected to the opposite sides of the two beds.

[0018] Two servo drive mechanisms are respectively set above the two beds and are respectively connected to the left and right thread rolling dies to control the left and right thread rolling dies to move synchronously in opposite directions.

[0019] A turntable, which can rotate around one side of the machine body, is provided on the turntable. The feeding mechanism, the conveying mechanism and the heating mechanism are all mounted on the turntable.

[0020] Furthermore, the turntable is provided with a mounting plate and a centering adjustment mechanism that can move along the distance between the left and right thread rolling dies. The centering adjustment mechanism is connected to the bottom of the mounting plate. The feeding mechanism, the material feeding mechanism, and the heating mechanism are all mounted on the mounting plate.

[0021] Furthermore, a load-bearing balance cylinder is respectively installed above the left and right thread rolling dies. The telescopic ends of the two load-bearing balance cylinders are connected to the lower left and right thread rolling dies respectively, and the fixed ends are connected to the machine body.

[0022] Furthermore, an oil return groove is provided at the bottom of the installation space of the machine body, the oil return groove extends to the bottom of the two beds, and a cooling oil pipe for injecting cooling oil into the processing space is provided above the left thread rolling die.

[0023] Furthermore, a material distribution mechanism is provided below the processing space. The material distribution mechanism includes a material distribution hopper with two discharge ports, a material distribution baffle that guides qualified and unqualified products into the two discharge ports respectively, and a rotary cylinder that controls the rotation of the material distribution baffle.

[0024] Furthermore, the top of the right thread rolling die is provided with a pressing positioning mechanism and an axial positioning mechanism. The pressing mechanism includes a pressure plate that can be raised and lowered. The lower end of the pressure plate can extend into the processing space between the first thread rolling plate and the second thread rolling plate. The bottom surface of the pressure plate is a horizontal plane. The axial positioning mechanism includes a fixed-length positioning plate that can move along a direction perpendicular to the distance between the first thread rolling plate and the second thread rolling plate.

[0025] Furthermore, the left thread rolling die also includes a left die mounting base that can deflect around a vertical axis, and the right thread rolling die also includes a right die mounting base that can deflect around a horizontal axis. The left die mounting base and the right die mounting base are provided with mounting grooves on opposite sides, and a die base is provided in the mounting groove. The first thread rolling plate and the second thread rolling plate are respectively fixed to the corresponding die base by fixing plates.

[0026] Furthermore, the top surface of the first thread rolling plate is inclined to fit the mold base, and the bottom surface of the first thread rolling plate is inclined to fit the fixing block. The fixing block can press the first thread rolling plate tightly onto the mold base by squeezing it with the inclined surface.

[0027] The bottom surface of the second thread rolling plate is inclined to fit the mold base, and the top surface of the second thread rolling plate is inclined to fit the fixing block. The fixing block can press the second thread rolling plate tightly onto the mold base by pressing it with the inclined surface.

[0028] Furthermore, the sides of the first and second thread rolling plates are pressed and fixed by side fixing blocks. The mold base is provided with a top pressure cylinder and a screw. The side fixing block has a waist-shaped hole in the middle. The screw passes through the waist-shaped hole and is threaded to the nut. The top pressure cylinder can apply outward pressure to one end of the side fixing block, so that the side fixing block deflects towards the position of the first and second thread rolling plates with the nut as the fulcrum, so as to press the sides of the first and second thread rolling plates together.

[0029] Its advantages over existing technologies are:

[0030] In this invention, the material is taken from the outlet of the feeding mechanism by the feeding mechanism, then moved to the heating mechanism for heating, and finally transferred to the processing space formed between the first thread rolling plate and the second thread rolling plate. Both the first thread rolling plate and the second thread rolling plate are in dynamic motion. During thread rolling, the first thread rolling plate and the second thread rolling plate will move synchronously up and down towards each other. Through the teeth set on the surface of the thread rolling plate, external threads are formed on the surface of the blank. In this way, the position of the blank remains relatively unchanged during the thread rolling process, and the processing time is shorter.

[0031] If the first and second thread rolling plates are no longer parallel, they can be corrected in time. First, the taper adjustment mechanism can be used to control the first thread rolling plate to deflect around a vertical axis, thereby adjusting the angle between the first and second thread rolling plates relative to the vertical plane, i.e., the taper. Then, the parallelism adjustment mechanism can be used to control the second thread rolling plate to deflect around a horizontal axis, thereby adjusting the angle between the first and second thread rolling plates relative to the horizontal plane, i.e., the parallelism. Finally, the spacing adjustment mechanism can be used to control the second thread rolling plate to move closer to or further away from the first thread rolling plate, thereby adjusting the spacing between the first and second thread rolling plates.

[0032] By adjusting the first and second thread rolling plates at multiple angles, it is ensured that the first and second thread rolling plates remain parallel, making it easier to adjust and control the product processing dimensions such as outer diameter and pitch diameter, thereby improving processing accuracy.

[0033] Since the first and second thread rolling plates are independently controlled to move up and down, the thread structure between the two thread rolling plates is always consistent. Even if there is a ten-micron size error in the blank, the thread structure will not change. This has a great advantage in reducing the manufacturing cost of the blank. At the same time, the adjustment of the three important parameters does not affect each other. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the wire rolling machine in this invention;

[0035] Figure 2 This is a schematic diagram of the structure of a wire rolling machine from another perspective;

[0036] Figure 3 This is a schematic diagram of the structure of a thread rolling machine.

[0037] Figure 4 yes Figure 3 Another structural diagram from another perspective;

[0038] Figure 5 This is a front view structural diagram of the left and right thread rolling dies.

[0039] Figure 6 This is a schematic diagram of the axial structure of the left and right thread rolling dies;

[0040] Figure 7 This is a schematic diagram of the left thread rolling die;

[0041] Figure 8 This is a structural schematic diagram of the left thread rolling die from another perspective;

[0042] Figure 9 This is an exploded structural diagram of the left thread rolling die;

[0043] Figure 10 This is a schematic diagram of the installation structure of each component on the left die mounting base in the left thread rolling die;

[0044] Figure 11 This is a schematic diagram of the structure of the left slide block in the left thread rolling die;

[0045] Figure 12 This is a schematic diagram of the installation structure of the right thread rolling die, the downward positioning structure, and the axial positioning mechanism;

[0046] Figure 13 This is a schematic diagram of the right-side thread rolling die;

[0047] Figure 14 This is an exploded structural diagram of the right-side thread rolling die;

[0048] Figure 15 This is a schematic diagram of the downward positioning mechanism;

[0049] Figure 16 This is a schematic diagram showing the first and second thread rolling plates in conjunction with the blank.

[0050] Figure 17 It is a schematic diagram of the installation structure of each structure on the turntable;

[0051] Figure 18 This is a schematic diagram of the material distribution component in the feeding mechanism;

[0052] Figure 19 This is a schematic diagram of the positioning component in the feeding mechanism;

[0053] Figure 20 This is a schematic diagram of the heating mechanism;

[0054] Figure 21 This is a schematic diagram showing the feeding mechanism in conjunction with the positioning components and the heating mechanism;

[0055] Figure 22 This is a structural diagram of the locking mechanism.

[0056] Figure 23 This is a schematic diagram of the material distribution mechanism;

[0057] Figure 24 This is a schematic diagram of the separation mechanism from another perspective.

[0058] In the diagram, 1. Machine body; 2. Left thread rolling die; 201. Left fixed base; 202. Left slide base; 2021. First receiving groove; 2022. Second receiving groove; 203. Left die mounting base; 204. First thread rolling plate; 205. Taper adjustment mechanism; 2051. Fixed plate; 2052. Reversing device; 2053. First adjusting block; 2054. Long screw; 206. Die base; 3. Right thread rolling die; 301. Right fixed base; 302. Right slide base; 3021. Third receiving groove; 3022. Fourth receiving groove; 303. Right die mounting base; 304. Second thread rolling plate; 3041. Sloping area; 3 05. Parallelism adjustment mechanism; 3051. Second adjusting block; 306. Spacing adjustment mechanism; 3061. Third adjusting block; 307. Support plate; 4. Feeding mechanism; 41. Vibratory feeder assembly; 42. Distributing assembly; 421. Support frame; 422. First support plate; 423. Second support plate; 424. Fixed support; 425. Discharge slide plate; 426. Distributing cylinder; 427. Distributing plate; 428. First backing plate; 429. Second backing plate; 43. Positioning assembly; 431. Cylinder fixing frame; 432. Lifting cylinder; 433. V-shaped seat; 434. Positioning groove plate; 435. Baffle plate; 5. Feeding mechanism; 51. Feeding cylinder; 52. Suction rod; 6. Heating mechanism; 61. Base frame; 62. Lifting platform; 63. Heater; 64. Heating coil; 7. Turntable; 71. Mounting plate; 72. Centering adjustment mechanism; 73. Digital caliper; 8. Servo drive mechanism; 801. Servo motor; 802. Lead screw; 803. Motor mounting base; 9. Locking mechanism; 91. First fixing part; 92. Second fixing part; 921. Stop part; 93. Third fixing part; 931. Connecting part; 10. Bed; 11. Oil return groove; 12. Material distribution mechanism; 121. Material distribution hopper; 1211. Partition plate; 122. Rotary cylinder; 123. 124. Material distribution baffle; 13. Pipe; 14. Pressing positioning mechanism; 15. Bracket; 16. Pressing cylinder; 17. Pressure plate; 18. Lifting screw; 19. Axial positioning mechanism; 10. Length positioning plate; 10. Cooling oil pipe; 11. Clamping part; 12. Knob; 13. Turn handle; 14. Shaft; 25. Shaft positioning block; 26. Semi-circular shaft; 27. Fixing block; 28. Side fixing block; 29. ​​Screw; 20. Nut; 21. Top pressing cylinder; 22. Guide bar; 23. Drive rod; 24. Pull rod; 35. Load balance cylinder; 36. Shaft seat; 37. Material receiving oil tank; 38. Material box; 39. Billet. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0060] A preferred embodiment of the present invention provides a high-precision numerical control thread rolling machine, which is applicable to the forming processing of bolts of various specifications. In this thread rolling machine, two slide seats are independently servo-driven and CNC-controlled to move towards each other at a constant speed. The thread pitch between the two thread rolling plates always remains consistent. Even if there is a size error of ten wires in the blank, the thread pitch will never change, which has great advantages in reducing the manufacturing cost of the blank.

[0061] Specifically, referring to Figures 1-6 , this thread rolling machine mainly includes a machine body 1, a left thread rolling die 2, a right thread rolling die 3, a feeding mechanism 4, a heating mechanism 6, a material feeding mechanism 5, a downward pressing and positioning mechanism 13, an axial positioning mechanism 14, and two servo drive mechanisms 8.

[0062] The machine body 1 is made of cast iron and is integrally cast, having the advantages of high strength and not being easily deformed. There is a through-hole "mouth" - shaped installation space on the machine body 1, making the shape of the machine body 1 present as a "mouth" shape, and the left and right side walls of this installation space are also strengthened.

[0063] When designing this machine body 1, referring to the U-shaped machine body structure of traditional thread rolling machines in the current existing technology, through mechanical analysis of this structure, it is found that when the traditional thread rolling machine body is under a large lateral load, due to the characteristics of its U-shaped machine body itself, the overall machine body will expand outward. This phenomenon will also be reflected in the size fluctuations of the processed products, which is consistent with the actual processing results, proving that the theoretical analysis is correct. To solve this problem, in the existing technology, a tension beam is added above the U-shaped machine body to reduce the outward expansion phenomenon of the machine body under stress. However, due to the limitations of the size and installation position of the tension beam used, the reduction amplitude of the outward expansion phenomenon is not consistent.

[0064] Therefore, we adopt a "mouth" - shaped closed - force - bearing machine body 1 made of ductile iron by integral casting. After stress relief annealing and aging treatment, it is integrally processed and formed to achieve precise control of the installation position dimensions of each component.

[0065] For the single "mouth" - shaped integrally - cast closed - force - bearing machine body 1, through the method of establishing finite element analysis, stress, strain, and modal analysis can be carried out on it. When applying a lateral horizontal uniform load with a limit load of 200 KN to the side of the machine body, under the limit load of 200 KN, the maximum strain of the machine body is only 0.0009011.

[0066] Meanwhile, equivalent stress analysis was performed on the integral cast closed-type stress-bearing fuselage 1 in Ansys software. Under extreme load conditions, the average equivalent stress of the fuselage was about 24.7 MPa, and the maximum value was about 257 MPa. It can be seen that the overall structural design of the fuselage is reasonable, and the rigidity and strength of the structure fully meet the requirements of the actual processing. Under extreme load conditions, it will not cause loss of processing dimensional accuracy due to excessive rigidity deformation.

[0067] like Figures 2-3 As shown, two beds 10 are respectively provided on the left and right sides of the mounting space on the machine body 1. These two beds 10 are arranged opposite each other and are fixedly installed on the corresponding side walls of the mounting space by bolts. Two servo drive mechanisms 8 are installed on the top of the machine body 1, respectively located directly above the two beds 10.

[0068] The left thread rolling die 2 and the right thread rolling die 3 are arranged opposite to each other and are slidably connected to the two bed plates 10. The two servo drive mechanisms 8 drive the left thread rolling die 2 and the right thread rolling die 3 to move synchronously in opposite directions.

[0069] Each of the two bed plates 10 has a through groove on its opposite side for mounting the lead screw 802 in the servo drive mechanism 8. On each side of the groove on the opposite side of the two bed plates 10, there is a slide rail. The left thread rolling die 2 and the right thread rolling die 3 are slidably connected to the corresponding slide rail by a slider.

[0070] The main load-bearing components of this thread rolling machine are the U-shaped integral cast enclosed load-bearing machine body 1 and the high-load slide rails and bed 10 on both sides. As the main load-bearing components for positive pressure, they directly determine whether the accuracy of the center diameter of the processed parts meets the standard, and need to have the characteristics of high strength and high rigidity.

[0071] Meanwhile, a finite element analysis was conducted on the two side beds and the integral cast closed load-bearing body in the shape of a square. Due to the increase in the thickness of the main load-bearing structure, the equivalent stress under the ultimate load condition was reduced, with the average and maximum values ​​being about 2 / 3 of the original values.

[0072] The thickness of both the machine body 1 and the bed 10 has been increased. Increasing the thickness of the load-bearing structure has not reduced the natural frequency of the structure. The actual machining cycle of the machine tool is still much smaller than the natural frequency of the structure, and it still maintains good anti-resonance characteristics.

[0073] See Figure 3The servo drive mechanism 8 mainly consists of a servo motor 801, a lead screw 802, and two bearing seats. The two bearing seats are located on the upper and lower sides of a groove on the bed 10, respectively, and the upper and lower ends of the lead screw 802 are rotatably connected to the two bearing seats. A motor mounting base 803 is provided on the top of each of the two beds 10, and the two servo motors 801 are respectively mounted on the two motor mounting bases 803. Due to limited installation space, a clearance hole is provided on the top of the machine body 1 at the position corresponding to the servo motor 801, allowing the machine body 1 to pass through the clearance hole and exit from the top of the machine body 1. The upper end of the lead screw 802 is driven and connected to the output end of the servo motor 801.

[0074] The lead screw 802 is connected to the left thread rolling die 2 and the thread rolling die via a transmission. The servo motor 801 controls the rotation of the lead screw 802, thereby driving the left thread rolling die 2 or the right thread rolling die 3 to move up and down.

[0075] In this embodiment, the slide system adopts a high-performance servo digital motor and a high-load drive stage ball screw to independently drive the left thread rolling die 2 or the right thread rolling die 3 to move up and down in the form of servo direct drive. The position of the bed 10 is precisely controlled by the CNC system, thereby realizing high-precision control and positioning of the bed 10.

[0076] Compared to the traditional flywheel linkage type slide drive system of thread rolling machines, the servo direct drive system features better dynamic response, more precise position control, fewer transmission links, and smaller backlash. Furthermore, because the flywheel linkage type drives the slide by relying on the inertia of the flywheel, traditional thread rolling machines suffer from difficulties in manual single-piece machining and discrepancies between manual and automatic dimensional adjustments. In contrast, the servo direct drive slide system directly provides the driving force of the bed 10 through a servo motor, and the instantaneous torque can be adjusted in real time as needed, thus achieving more precise position control during operation. Moreover, the servo direct drive slide system offers significant advantages over the traditional flywheel linkage drive system in thread setting operations and inching single-piece machining.

[0077] like Figures 7-11 As shown, the left thread rolling die 2 mainly consists of a left fixed base 201, a left slide base 202, a left die mounting base 203, a taper adjustment mechanism 205, and a first thread rolling plate 204. The left fixed base 201 is slidably connected to the slide rail on the bed 10 via a slider, and the left slide base 202 is fixedly mounted on the left fixed base 201 on the side opposite to the slide rail by bolts. The left die mounting base 203 can be horizontally deflected relative to the left slide base 202, and the first thread rolling plate 204 is mounted on the left die mounting base 203.

[0078] A first receiving groove 2021, a second receiving groove 2022, and a positioning groove are provided on opposite sides of the left slide base 202 and the left mold mounting base 203. The second receiving groove 2022 is located on the same side of the left slide base 202 and the left mold mounting base 203, and extends vertically. The first receiving groove 2021 is located in the middle of the second receiving groove 2022, dividing the second receiving groove 2022 into upper and lower parts. The positioning groove is located on the other side of the left slide base 202 and the left mold mounting base 203 (the side away from the second receiving groove 2022).

[0079] The rotating shaft 19 and the rotating shaft positioning block 20 are located between the left slide base 202 and the left mold mounting base 203. The rotating shaft 19 is vertically arranged and is embedded in two second receiving grooves 2022. The cross-sectional shape of the second receiving groove 2022 is semi-circular, which is adapted to the outer arc surface of the rotating shaft 19. The two ends of the rotating shaft positioning block 20 are embedded in two first receiving grooves 2021. A circular hole is provided in the middle of the rotating shaft positioning block 20, through which the rotating shaft 19 passes.

[0080] The pivot positioning block 20 is fixed to the left mold mounting base 203 by long bolts. The side of the pivot positioning block 20 is flat, and this flat surface is in close contact with the side wall of the second receiving groove 2022 on the left mold mounting base 203. The other side of the pivot positioning block 20, that is, the part that is embedded in the second receiving groove 2022 on the left slide base 202, is rounded so that there is no interference when the left mold mounting base 203 is deflected relative to the left slide base 202.

[0081] The positioning groove also has a semi-circular cross-sectional shape to fit the arc surface of the semi-circular shaft 21. The semi-circular shaft 21 is vertically positioned, with its arc surface tightly attached to the positioning groove.

[0082] See 8. Figure 9 The taper adjustment mechanism 205 mainly consists of a first adjusting block 2053, a fixed plate 2051, a lead screw, a rotating rod, and a commutator 2052. The commutator 2052 is fixedly mounted on the fixed plate 2051, which in turn is bolted to the left fixed seat 201. The rotating rod and the lead screw are connected to the input and output ends of the commutator 2052, respectively, and their directions are perpendicular. A throttle 18 is mounted on the other end of the rotating rod, and the other end of the lead screw is connected to the first adjusting block 2053. Rotating the throttle 18 rotates the rotating rod, which then reverses direction via the commutator 2052, causing the lead screw to rotate and subsequently moving the first adjusting block 2053 back and forth.

[0083] In the taper adjustment mechanism 205, the rotating rod is manually controlled to rotate. In other embodiments, the rotating rod can also be electrically controlled by a motor.

[0084] A locking element and a knob 17 are also provided on the side of the left fixed base 201. The knob 17 is threadedly connected to the locking element. The lead screw connected to the input end of the commutator 2052 passes through the locking element. When the angle of the first thread rolling plate 204 is adjusted, the knob 17 can be turned, and the locking element will hold the lead screw tightly to prevent it from rotating.

[0085] A groove is provided on the side of the left slide base 202 near the left mold mounting base 203, creating a large gap between the left slide base 202 and the left mold mounting base 203. The first adjusting block 2053 is a wedge-shaped block, which is inserted into the gap and contacts the groove plane. The inclined side of the first adjusting block 2053 contacts the plane of the semi-circular shaft 21. As the first adjusting block 2053 is gradually inserted into the gap between the left slide base 202 and the left mold mounting base 203, it will cause the left mold mounting base 203 and the first thread rolling plate 204 to deflect horizontally relative to the left slide base 202 via the rotating shaft 19, thereby adjusting the angle of the first thread rolling plate 204. At this time, the left mold mounting base 203 will also rotate relative to the semi-circular shaft 21.

[0086] See Figure 11 Two guide bars 27 are provided in the groove of the left slide block 202. The guide bars 27 extend along the sliding direction of the first adjusting block 2053. Correspondingly, two guide grooves (not shown in the figure) are opened on the first adjusting block 2053. The guide bars 27 are horizontally slidably connected to the guide grooves to provide guidance for the sliding of the first adjusting block 2053 and prevent the first adjusting block 2053 from deviating.

[0087] See Figure 10 Two through holes (not shown in the figure) are provided on the left mold mounting base 203 and the left slide base 202. A long screw 2054 is installed in each through hole. The through hole on the left mold mounting base 203 has a countersunk hole. After the long screw 2054 passes through the through holes on the left mold mounting base 203 and the left slide base 202, it is threaded into the left fixed base 201. The head of the long screw 2054 retracts into the countersunk hole, and the shank of the long screw 2054 has a clearance fit with the two through holes to allow for the deflection of the left mold mounting base 203. After the long screw 2054 is threaded into the left fixed base 201, it will tightly hold the adjusted left mounting base onto the left slide base 202, preventing the rotating shaft 19 from detaching from the left slide base 202.

[0088] Two clearance slots are also provided at corresponding positions on the first adjusting block 2053 to allow the long screw 2054 to make way, so as not to interfere with the movement of the first adjusting block 2053.

[0089] like Figure 10As shown, a mounting groove (not labeled in the figure) is located on the left mold mounting base 203 near the right thread rolling die 3. This mounting groove is located near the lower side of the left mold mounting base 203. The adjacent two sides of the mounting groove have inner walls, while the other two sides are open. A mold base 206 is installed in the mounting groove, and the mold base 206 is usually fixed in the mounting groove with bolts. The first thread rolling plate 204 is located on the mold base 206. The top surface of the first thread rolling plate 204 is inclined to fit with the mold base 206. A fixing block 22 is provided at the bottom of the left mold mounting base 203. The fixing block 22 is fixed to the bottom of the left mold mounting base 203 with bolts and is also inclined to fit with the bottom surface of the first thread rolling plate 204. By tightening the bolts, the fixing block 22 will apply a compressive force to the bottom of the first thread rolling plate 204 under the action of the inclined surface, so that the first thread rolling plate 204 is pressed and fixed on the mold base 206.

[0090] Two side fixing blocks 23 and two top-pressure cylinders 26 are provided on the side of the left mold mounting base 203. Each top-pressure cylinder 26 corresponds to one of the two side fixing blocks 23. The top-pressure cylinders 26 are installed inside the left mold mounting base 203 with their output ends facing outwards. Each side fixing block 23 has a horizontally extending oblong hole in the middle, and a screw 24 is installed inside the oblong hole, threadedly connected to the left mold mounting base 203. After passing through the oblong hole, the screw 24 is threadedly connected to a nut 25. One end of the side fixing block 23 contacts the side of the first thread rolling plate 204, and the other end contacts the output end of the top-pressure cylinder 26. Nut 25 acts as a fulcrum, applying outward pressure to one end of the side fixing block 23 via the top-pressure cylinder 26. Utilizing the lever principle, the other end of the side fixing block 23 (away from the top-pressure cylinder 26) is pressed against the side of the first thread rolling plate 204, using nut 25 as a fulcrum, thus securing all four sides of the first thread rolling plate 204 and preventing its displacement during thread rolling. The leverage effect allows for greater pressure on the sides of the first thread rolling plate 204.

[0091] The hydraulic locking force of the hydraulic cylinder is stable and continuous, so it will not loosen under alternating stress. Therefore, the teeth on opposite sides of the two thread rolling plates will not change, and the size will not change. This is a stable prerequisite, and the change in the locking force of the thread rolling plates can be monitored by monitoring the change in hydraulic pressure.

[0092] like Figures 12-14As shown, the right thread rolling die 3 mainly consists of a right fixed base 301, a right slide base 302, a right die mounting base 303, a parallelism adjustment mechanism 305, a spacing adjustment mechanism 306, and a second thread rolling plate 304. The right fixed base 301 is slidably connected to a slide rail on the corresponding bed 10 via a slider. The right slide base 302 is bolted to the right fixed base 301 on the side opposite to the slide rail. The right die mounting base 303 can rotate vertically relative to the right slide base 302, and the second thread rolling plate 304 is mounted on the right die mounting base 303.

[0093] A third receiving groove 3021, a fourth receiving groove 3022, and a positioning groove are provided on opposite sides of the right slide base 302 and the right mold mounting base 303. The third receiving groove 3021 is located on the same side of the right slide base 302 and the right mold mounting base 303 and extends horizontally. The fourth receiving groove 3022 is located in the middle of the third receiving groove 3021 and divides the third receiving groove 3021 into front and rear parts. The positioning groove is located on the other side of the right slide base 302 and the right mold mounting base 303 (the side away from the third receiving groove 3021), and the positioning groove also extends horizontally.

[0094] The rotating shaft 19 and the rotating shaft positioning block 20 are located between the right slide base 302 and the right mold mounting base 303. The rotating shaft 19 is horizontally positioned, extending along the width direction of the second thread rolling plate 304, and is respectively embedded in two third receiving grooves 3021. The cross-sectional shape of the third receiving groove 3021 is also semi-circular, which is adapted to the outer arc surface of the rotating shaft 19. The two ends of the rotating shaft positioning block 20 are respectively embedded in the two third receiving grooves 3021. A circular hole is provided in the middle of the rotating shaft positioning block 20, through which the rotating shaft 19 passes.

[0095] The pivot positioning block 20 is fixed to the right mold mounting base 303 by long bolts. The side of the pivot positioning block 20 is flat, and this flat surface is in close contact with the side wall of the fourth receiving groove 3022 on the right mold mounting base 303. The other side of the pivot positioning block 20, that is, the part that is embedded in the fourth receiving groove 3022 on the right slide base 302, is rounded so that there is no interference when the right mold mounting base 303 is deflected relative to the right slide base 302.

[0096] The positioning groove also has a semi-circular cross-sectional shape to fit the arc surface of the semi-circular shaft 21. The semi-circular shaft 21 is horizontally positioned, with its arc surface closely attached to the positioning groove.

[0097] See Figure 13 , Figure 14The parallelism adjustment mechanism 305 is located at the bottom of the right mold mounting base 303. The parallelism adjustment mechanism 305 mainly consists of a second adjusting block 3051, a fixing plate 2051, a lead screw, a motor mounting base 803, and a motor. The commutator 2052 is fixedly mounted on the motor mounting base 803, which is bolted to the bottom of the support plate. The output end of the motor is connected to the input end of the commutator 2052, and the output end of the commutator 2052 is connected to the lead screw. The input and output ends of the commutator 2052 are perpendicular. The lead screw passes through the support plate and is connected to the second adjusting block 3051. After the motor operates, the commutator 2052 reverses the direction, causing the lead screw to rotate, which in turn moves the second adjusting block 3051 up and down.

[0098] In the parallelism adjustment mechanism 305, the lead screw is electrically controlled to rotate, but in other embodiments, the lead screw rotation can also be manually controlled.

[0099] A groove is provided on the right slide base 302 near the right mold mounting base 303, creating a large gap between the right slide base 302 and the right mold mounting base 303. This groove is located on the lower side of the right slide base 302. The second adjusting block 3051 is a wedge-shaped block, which is inserted into this gap and contacts the groove plane. The inclined side of the second adjusting block 3051 contacts the plane of the semi-circular shaft 21. As the second adjusting block 3051 is gradually inserted into the gap between the right slide base 302 and the right mold mounting base 303, it will cause the right mold mounting base 303 and the second thread rolling plate 304 to deflect upward relative to the right slide base 302 via the rotating shaft 19, thereby adjusting the upward swing angle of the second thread rolling plate 304, that is, adjusting the angle between the first thread rolling plate 204 and the second thread rolling plate 304 relative to the vertical plane. At this time, the right mold mounting base 303 will also rotate relative to the semi-circular shaft 21.

[0100] Two guide bars 27 are provided in the groove of the right slide block 302. The guide bars 27 extend along the sliding direction of the second adjusting block 3051. Correspondingly, two guide grooves (not shown in the figure) are opened on the second adjusting block 3051. The guide bars 27 are slidably connected to the guide grooves to provide guidance for the sliding of the second adjusting block 3051 and prevent the second adjusting block 3051 from deviating.

[0101] The parallelism adjustment of the thread rolling plate adopts an independent servo CNC motor drive adjustment, which can realize the adjustment of the distance between the mold seat inlet and outlet, and realize the adjustment of the thread rolling plate feed size in a more digital way, making it easier to adjust and control the product processing size such as outer diameter and middle diameter.

[0102] like Figure 13As shown, the right mold mounting base 303 also has a mounting groove (not marked in the figure) on the side near the left mold mounting base 203. This mounting groove is located near the top of the right mold mounting base 303, opposite in position to the mounting groove on the left mold mounting base 203. A mold base 206 is also installed in this mounting groove, and the specific installation method is the same as that on the left mold mounting base 203, which will not be described in detail here.

[0103] The second thread rolling plate 304 is pressed and fixed on the mold base 206. A fixing block 22, a side fixing block 23 and a top pressure cylinder 26 are also provided on the side of the right mold mounting base 303. For the specific installation method, please refer to the above description of the left thread rolling mold 2. It will not be described in detail here.

[0104] like Figure 14 As shown, the spacing adjustment mechanism 306 mainly consists of a third adjusting block 3061, a lead screw, a motor mounting base 803, a commutator 2052, and a motor. The third adjusting block 3061 is also a wedge-shaped block, located between the right slide base 302 and the right fixed base 301, and has an inclined surface fit with the right slide base 302. The motor mounting base 803 is fixed to the bottom of the support plate with bolts. The commutator 2052 is fixedly mounted on the motor mounting base 803. The output end of the motor is connected to the input end of the commutator 2052, and the output end of the commutator 2052 is connected to the lead screw. The directions of the input and output ends of the commutator 2052 are perpendicular. The lead screw passes through the support plate and is connected to the third adjusting block 3061 for transmission.

[0105] After the motor's operation is reversed by the commutator 2052, it drives the lead screw to rotate, which in turn drives the third adjusting block 3061 to move up and down. The third adjusting block 3061 presses the right slide table 302 through the inclined surface, causing the right slide table 302 to slide horizontally along the slide rail on the support plate, adjusting the gap between the second thread rolling plate 304 and the first thread rolling plate 204. During the thread rolling process, a compressive force is applied to the blank 34, forming threads on the surface of the blank 34. The gap adjustment mechanism 306 can also adjust the thread depth formed on the surface of the blank 34.

[0106] A guide portion is formed on the side of the third adjusting block 3061 away from the inclined surface. The guide portion extends vertically, and a guide groove is formed on the right fixed seat 301. The guide portion and the guide groove are slidably connected to each other to provide guidance for the vertical sliding of the third adjusting block 3061.

[0107] The adjustment of the distance between the two thread rolling plates, i.e. the adjustment of the thread pitch diameter, is driven by a servo CNC motor. This structure reliably adjusts the distance between the two thread rolling plates digitally and has a self-locking function. After the die holder is adjusted and locked, the die holder will not shift or misalign under extreme pressure.

[0108] In this invention application, the taper adjustment, parallelism adjustment, and spacing adjustment of the thread rolling plate are all independent. Compared with the common traditional thread rolling machine mold base that uses bolts with or without displays to adjust the spacing, parallelism, and taper, CNC control can more conveniently and accurately achieve the required positioning adjustment, and they do not affect each other. It has extremely high repeatability, which makes it convenient to call the original stored processing parameters with one click when processing similar products in the future, and to adjust and lock the position of the mold base by CNC, reducing the difficulty of machine adjustment.

[0109] See Figure 13 , Figure 14 A hydraulic cylinder (not shown in the figure) is installed inside the right fixed seat 301. Correspondingly, through holes are provided on the right slide seat 302 and the right mold mounting seat 303, with a countersunk hole inside the through hole on the right mold mounting seat 303. A vertically extending clearance hole is provided on the third adjusting block 3061 to allow space for the hydraulic cylinder drive rod 28. The hydraulic cylinder drive rod 28 passes sequentially through the third adjusting block 3061, the right slide seat 302, and the right mold mounting seat 303, and is connected to the nut 25. After the parallelism adjustment mechanism 305 completes the angle adjustment of the right mold mounting seat 303 and the second thread rolling plate 304, the hydraulic cylinder drive rod 28 retracts, and the nut 25 on the drive rod 28 retracts into the countersunk hole on the right mold mounting seat 303. The drive rod 28 has a clearance fit with the through holes on the right mold mounting seat 303 and the right slide seat 302. The diameter of the nut 25 is larger than the diameter of the through hole but smaller than the diameter of the countersunk hole. When the drive rod 28 of the hydraulic cylinder retracts, it will tighten the right mold mounting base 303 through the nut 25, so that the right mold mounting base 303 is held and fixed on the right slide table 302. The nut 25 plays a limiting role.

[0110] The first thread rolling plate 204 and the second thread rolling plate 304 have several tooth bodies on opposite sides that are adapted to the shape and helix angle of the thread being processed. The tooth bodies extend along the surface of the first thread rolling plate 204 and the second thread rolling plate 304 and protrude from the surface of the first thread rolling plate 204 and the second thread rolling plate 304 for forming threads on the blank 34.

[0111] The teeth on the first thread rolling plate 204 can correspond one-to-one with the teeth on the second thread rolling plate 304, or they can be spaced apart.

[0112] See Figure 16The first thread rolling plate 204 and the second thread rolling plate 304 are spaced a certain distance apart, forming a processing space. Each of the upper and lower edges of the opposite sides of the first thread rolling plate 204 and the second thread rolling plate 304 has a sloping area 3041. Initially, the first thread rolling plate 204 and the second thread rolling plate 304 are vertically offset. The sloping area 3041 on the upper edge of the second thread rolling plate 304 forms a certain angle with the first thread rolling plate 204. The blank 34 is placed within this angle. The slope supports the blank 34, preventing it from falling, and also helps guide the blank 34 into the processing space of the first thread rolling plate 204 and the second thread rolling plate 304. When the first thread rolling plate 204 and the second thread rolling plate 304 move synchronously upwards and in opposite directions, the blank 34 will not be lifted upwards by the top surface of the second thread rolling plate 304.

[0113] like Figure 12 As shown, a pressing positioning mechanism 13 and an axial positioning mechanism 14 are also provided on the top of the right mold mounting base 303, which are used to press down the blank 34 and to position the blank 34 axially, respectively.

[0114] See Figure 15 The pressing and positioning mechanism 13 mainly includes a bracket 131, a pressure plate 133, a pressing cylinder 132, a lifting screw 134, a clamping component 16, a knob 17, and a throttle 18. The lower end of the bracket 131 is bolted to the top of the right mold mounting base 303. The pressing cylinder 132 is vertically positioned, and its output end is connected to the pressure plate 133 to control its vertical movement. A guide rod is connected to the upper end of the pressing cylinder 132, and this guide rod is interlocked with the upper end of the bracket 131. The lifting screw 134 passes through the upper end of the bracket 131 and is threadedly connected to it. The lower end of the lifting screw 134 is rotatably connected to the upper end of the cylinder, and the upper end of the lifting screw 134 is connected to the throttle 18. Manually rotating the throttle 18 rotates the lifting screw 134, thereby moving the pressing cylinder 132 up and down to adjust its height.

[0115] The clamping member 16 is installed on the top of the bracket 131. The knob 17 is threadedly connected to the clamping member 16. The upper end of the lifting screw 134 passes through the clamping member 16. After the height of the pressing cylinder 132 is adjusted, the clamping member 16 clamps the lifting screw 134 by turning the knob 17 to prevent the lifting screw 134 from rotating again.

[0116] The pressure plate 133 is tilted to one side and then bent downwards, making its shape Z-shaped. The lower end face of the pressure plate 133 is horizontal so that the blank 34 remains horizontal when it is pressed down. During the thread rolling process, the pressing cylinder 132 controls the pressure plate 133 to extend into the processing space. The pressure plate 133 will maintain a certain height and contact the blank 34. When the first thread rolling plate 204 and the second thread rolling plate 304 move synchronously upwards and downwards towards each other, the height of the blank 34 remains unchanged, and the blank 34 itself will rotate relative to the first thread rolling plate 204 and the second thread rolling plate 304.

[0117] See Figure 12 The axial positioning mechanism 14 mainly includes a cylinder and a fixed-length positioning plate 141. The lower end of the fixed-length positioning plate 141 extends into the processing space between the first thread rolling plate 204 and the second thread rolling plate 304. The cylinder is horizontally positioned and fixed to the top of the right mold mounting base 303. The output end of the cylinder is connected to the fixed-length positioning plate 141. The cylinder controls the fixed-length positioning plate 141 to move horizontally along the direction perpendicular to the distance between the first thread rolling plate 204 and the second thread rolling plate 304, with the direction of movement consistent with the axial direction of the blank 34. By adjusting the axial position of the fixed-length positioning plate 141 relative to the blank 34, the length of the thread to be processed on the rod of the blank 34 is adjusted. During thread rolling, the rod of the blank 34 will abut against the fixed-length positioning plate 141.

[0118] like Figure 2 , Figure 3 As shown, a nitrogen-filled load-balance cylinder 30 is installed above the left slide base 202 and the right slide base 302, respectively. The load-balance cylinders 30 are vertically positioned, with the lower ends of their extension rods connected to the tops of the left and right slide bases 202 and 302, respectively, and the upper ends connected to the top of the machine body 1. The two load-balance cylinders 30 are used to balance the weight of the left and right thread-rolling dies 2 and 3. When the left and right thread-rolling dies 2 and 3 move synchronously in opposite directions, the extension rods of the load-balance cylinders 30 automatically extend and retract, reducing the load on the servo motor 801 in the servo drive mechanism 8.

[0119] like Figure 7 As shown, a cooling oil pipe 15 is also provided above the left mold mounting base 203. The top surface of the left mold mounting base 203, near the machining space, has an inclined surface. The outlet of the cooling oil pipe 15 extends to this inclined surface, and the inlet connects to the source of the cooling oil. During thread rolling, the cooling oil sprayed from the cooling oil pipe 15 flows downwards along the inclined surface at the top of the left mold mounting base 203 into the machining space, landing on the blank 34 to cool and lubricate it.

[0120] During thread rolling, the first thread rolling plate 204 and the second thread rolling plate 304 compress the blank 34. The left thread rolling die 2 and the right thread rolling die 3 are subjected to a large reaction force, which acts on the machine body 1, causing the two sides of the machine body 1 to tend to open outward. The upper edge of the integrally cast machine body 1 is connected and holds the two sides of the left thread rolling die 2 and the right thread rolling die 3 of the machine body 1. At the same time, the pull rod 29 set on the back of the machine body 1 also holds the left and right sides of the machine body 1. The two ends of the pull rod 29 are fixedly connected to the inner walls of the two sides of the mounting space on the machine body 1, respectively.

[0121] By strengthening the structure at the location in the middle of the enclosed fuselage where the lateral load is most concentrated, and adding a pre-tensioning rod 29, the weakest part of the U-shaped fuselage structure was reinforced, thereby achieving extremely strong structural rigidity for the entire main fuselage. When the overall fuselage is subjected to a lateral force of 20 tons, the outward expansion deformation is only at the micrometer level.

[0122] like Figure 2 As shown, a rotatable turntable 7 is provided on the front side of the fuselage 1 (i.e. the side away from the pull rod 29). One side of the turntable 7 is horizontally rotatably connected to the rotating shaft seat 31 fixed on the front side of the fuselage 1 via a rotating shaft.

[0123] See Figure 17 The turntable 7 is equipped with two slide rails and a mounting plate 71. The extension direction of these two slide rails is perpendicular to the spacing direction of the left thread rolling die 2 and the right thread rolling die 3. The bottom of the mounting plate 71 is horizontally slidably connected to these two slide rails via a slider. The feeding mechanism 4, the feeding mechanism 5, and the heating mechanism 6 are all mounted on the mounting plate 71. The positions of the feeding mechanism 4, the feeding mechanism 5, and the heating mechanism 6 can be adjusted by sliding the mounting plate 71.

[0124] A centering adjustment mechanism 72 is provided on the turntable 7 at the bottom of the mounting plate 71. This centering adjustment mechanism 72 consists of a lead screw, a throttle 18, a lead screw seat, and two bearing seats. The two bearing seats are fixedly mounted on the turntable 7, corresponding to the left and right ends of the mounting plate 71, respectively. Both ends of the lead screw are rotatably connected to the two bearing seats. The throttle 18 is fixedly mounted on one end of the lead screw, and the lead screw seat is fixed to the bottom of the mounting plate 71. The lead screw is threadedly connected to the lead screw seat. By rotating the throttle 18, the lead screw can be rotated, thereby causing the mounting plate 71 to slide.

[0125] A digital caliper 73 is installed on the front side of the turntable 7. The digital caliper 73 consists of two parts: a scale module and a digital display module. The scale module is fixed to the front side of the turntable 7, and the digital display module is connected to the bottom of the mounting plate 71 through a connector. When the mounting plate 71 slides horizontally, the digital display module can read the scale on the scale module to determine the moving distance of the mounting plate 71.

[0126] See Figure 17The feeding mechanism 4 mainly includes a vibratory feeder assembly 41, a material distribution assembly 42, and a positioning assembly 43. The material distribution assembly 42 is connected to the discharge port of the vibratory feeder assembly 41, and the positioning assembly 43 is located on the side of the material distribution assembly 42 away from the vibratory feeder assembly 41 and is connected to the discharge port of the material distribution assembly 42.

[0127] The vibratory feeder assembly 41 will use vibration to transfer the blank 34 to the material distribution assembly 42.

[0128] See Figure 18 The material distribution assembly 42 mainly consists of a support frame 421, a fixed support 424, a material feeding slide plate 425, a material distribution cylinder 426, a material distribution plate 427, a first support plate 422, a second support plate 423, a first backing plate 428, and a second backing plate 429. The support frame 421 is vertically fixed to the mounting plate 71, the fixed support 424 is fixed to the top of the support frame 421, and the material feeding slide plate 425 is tilted and fixed to the fixed bracket 131, with the tilt direction from the side where the self-vibrating disc assembly 41 is located towards the side where the positioning assembly 43 is located.

[0129] The first support plate 422 and the second support plate 423 are respectively fixed on both sides of the support frame 421 (i.e., on both sides of the length direction of the feeding slide plate 425). The material distribution cylinder 426 is located above the feeding slide plate 425 and is obliquely fixedly installed on the second support plate 423. The material distribution plate 427 is connected to the output end of the material distribution cylinder 426, and the material distribution plate 427 is close to the material drop opening of the feeding slide plate 425. When the billet 34 comes out from the discharge port of the vibrating plate assembly 41, it will fall onto the feeding slide plate 425 and roll down along the feeding slide plate 425. The material distribution cylinder 426 will control the material distribution plate 427 to move downwards, blocking it at the material drop opening of the feeding slide plate 425 to prevent the billet 34 from rolling down.

[0130] The first support plate 428 and the second support plate 429 are both fixed to the first support plate 422 on the side near the unloading slide plate 425. The first support plate 428 is located directly above the second support plate 429 and is a certain distance apart from it. This distance is slightly larger than the diameter of the rod of the billet 34. The first support plate 428, the second support plate 429, and the unloading slide plate 425 form a guide area to facilitate the unloading of the billet 34. The head of the billet 34 will fall into the side of the first support plate 428 away from the unloading slide plate 425, and the rod will pass through the gap between the first support plate 428 and the second support plate 429 and fall onto the unloading slide plate 425. The first support plate 428 and the second support plate 429 cooperate to limit the movement of the billet 34, and then the billet 34 will roll downwards along the unloading slide plate 425.

[0131] like Figure 19As shown, the positioning assembly 43 mainly comprises a cylinder mounting bracket 431, a lifting cylinder 432, a baffle plate 435, a V-shaped seat 433, and a positioning slot plate 434. The cylinder mounting bracket 431 is vertically fixed on the mounting plate 71. The lifting cylinder 432 is a sliding plate cylinder, which is vertically fixed on the cylinder mounting bracket 431. The V-shaped seat 433 is connected to the output end of the lifting cylinder 432 and has a V-shaped groove to accommodate the installation of the positioning slot plate 434. A V-shaped positioning groove is located in the middle of the positioning slot plate 434 for positioning the blank 34. The positioning groove is continuous from front to back. The positioning slot plate 434 is located directly below the discharge port of the unloading sliding plate 425. After the blank 34 closest to the discharge port on the discharge slide plate 425 falls onto the positioning groove plate 434, the lifting cylinder 432 will control the material distribution plate 427 to move down and insert into the discharge port of the discharge slide plate 425 to block the blank 34 on the discharge slide plate 425 and prevent it from continuing to roll downward.

[0132] The baffle plate 435 is located on the side of the positioning groove plate 434 away from the unloading slide plate 425, and is used to block the billet 34 falling onto the positioning groove plate 434 to prevent the billet 34 from rolling out of the positioning groove plate 434.

[0133] like Figure 21 As shown, the feeding mechanism 5 mainly consists of a bracket 131, a feeding cylinder 51, and a suction rod 52. The bracket 131 is fixed on the mounting plate 71. The feeding cylinder 51 acts as a pushing drive, used to push the blank 34 into the processing space between the first thread rolling plate 204 and the second thread rolling plate 304. The feeding mechanism 5 is horizontally fixed on the bracket 131, and the output end of the feeding cylinder 51 is connected to the suction rod 52 to control the back-and-forth movement of the suction rod 52. The movement direction of the suction rod 52 is perpendicular to the spacing direction of the first thread rolling plate 204 and the second thread rolling plate 304. By sliding the mounting plate 71, the centering position of the suction rod 52 between the first thread rolling plate 204 and the second thread rolling plate 304 can be adjusted.

[0134] The suction rod 52 has a suction port at its front end capable of generating negative pressure for sucking up the blank 34. The suction rod 52 has an internal gas channel that connects to a suction mechanism, which draws air outwards, creating negative pressure at the suction port. A lifting cylinder 432 controls the vertical movement of the positioning slot plate 434 to adjust its height, ensuring that the blank 34 falling onto the positioning slot plate 434 is at the same height as the suction rod 52. The height of the positioning slot plate 434 varies depending on the diameter of the blank 34, ensuring that the axial height of the blank 34 matches the axial height of the suction rod 52.

[0135] After the billet 34 falls onto the positioning slot plate 434, the feeding cylinder 51 controls the suction rod 52 to move. The suction rod 52 will approach the positioning slot plate 434 and attract the head of the billet 34 on the positioning slot plate 434, sucking up the billet 34. Then the feeding cylinder 51 continues to control the suction rod 52 to move forward, and the suction rod 52 will push the billet 34 out of the positioning slot plate 434.

[0136] like Figure 20 As shown, the heating mechanism 6 is located on one side of the positioning assembly 43. The heating mechanism 6 consists of a base frame 61, a lifting platform 62, a heater 63, and a heating coil 64. The lifting platform 62 is fixed to the base frame 61 and employs a scissor-type lifting structure to control the lifting and lowering of the heater 63 and adjust the height of the heating coil 64. The heating coil 64 is connected to the heater 63, and induction heating of the billet 34 is achieved through the heating coil 64.

[0137] The heating coil 64 has a through hole, the axis of which is horizontal and lies in the same vertical plane as the axis of the suction rod 52. The billet is fed into the through hole of the heating coil 64 for induction heating.

[0138] The height of the heating coil 64 is adjusted by the lifting platform 62 according to the different diameters of the blank 34.

[0139] An infrared thermometer (not shown in the figure) or a temperature sensor (not shown in the figure) is also provided next to the heating coil 64 to measure the temperature of the billet being heated in the heating coil 64 and to feed back the temperature of the billet to the heating system in real time, thereby controlling the heating temperature of the billet.

[0140] In this embodiment, the heating system's temperature control is developed into a fully closed-loop digital control system. A high-precision, high-feedback-speed infrared thermometer is used to provide timely and effective feedback of the heating temperature to the host computer. The host computer automatically determines the relationship between the measured feedback temperature and the set temperature. If the feedback temperature has not reached the set temperature, the heating system continues heating until the feedback temperature reaches the set temperature. Then, based on the corresponding settings, it decides whether to continue the heat preservation process or complete the heating process. If heat preservation continues, the heating system will execute a heat preservation program based on the real-time feedback temperature, firmly controlling the target measured temperature within the set temperature range. Compared to traditional heating furnaces or traditional heaters without feedback control, this solution significantly improves the control accuracy of the target heating temperature. Under certain conditions, temperature control accuracy can easily achieve ±1℃ control. Whether for titanium alloys, high-temperature alloys, or other materials, extremely high temperature control accuracy can be easily achieved, ensuring batch consistency and stability.

[0141] See Figure 21After the suction rod 52 picks up the blank 34, the feeding cylinder 51 pushes the blank 34 into the through hole of the heating coil 64. The heating coil 64 heats the blank 34. When the blank 34 is heated to the specified temperature, the feeding cylinder 51 continues to push the blank 34 onto the slope area 3041 on the upper edge of the second thread rolling plate 304. One side of the blank 34 abuts against the first thread rolling plate 204. The slope area 3041 provides support for the blank 34 and guides the blank 34 into the processing space during thread rolling.

[0142] This feeding method has a simple structure. The blank 34 is pushed sequentially into the heating coil 64 and the processing space by the feeding cylinder 51, without requiring excessive turnover. It has a fast feeding speed and low cost.

[0143] Because the heating coils of existing wire rolling machines are installed in the middle of a linear feed track, the workpiece needs to continue sliding down the track for a period of time after heating. During this sliding process, the workpiece experiences significant temperature loss. Furthermore, because the heating coils are arranged in a long, linear pattern, they cannot provide uniform heating around the circumference of the workpiece like circular coils. Also, because the workpiece is constantly moving during heating, effective and reliable temperature control is impossible. To address these issues, we have positioned the heating coil 64 at the end of the linear feed track, using a circular coil to heat each individual blank 34. While this may slightly reduce processing efficiency, it allows for effective digital control of the heating temperature of each individual product, ensuring the uniformity and consistency of the heating temperature of the blank 34.

[0144] like Figure 1 , Figure 17 As shown, the turntable 7 can be tilted to one side of the machine body 1 to allow for equipment maintenance and repair. A locking mechanism 9 is provided on the other side of the turntable 7 (i.e. the side away from the rotation axis) to lock the turntable 7 and the machine body 1 to prevent displacement during loading and feeding, which would affect the accuracy of feeding.

[0145] See Figure 22 The locking mechanism 9 consists of a first fixing member 91, a second fixing member 92, and a third fixing member 93. The first fixing member 91 is vertically arranged, with its upper end fixed to the turntable 7 by bolts, and its lower end connected to the second fixing member 92 by bolts. The second fixing member 92 is horizontally arranged. One side of the third fixing member 93 is fixed to the machine body 1 by bolts. The bolt holes on the third fixing member 93 are oblong holes that extend vertically to allow for height adjustment of the third fixing member 93.

[0146] The bottom of the second fastener 92 protrudes downward to form a stop portion 921, and the lower side of the third fastener 93 protrudes horizontally outward to form a connecting portion 931, so that when the second fastener 92 is attached to the connecting portion 931 of the third fastener 93, the connecting portion 931 will abut against the stop portion 921 to play a stopping role.

[0147] The upper surface of the connecting part 931 has an inclined surface. When the turntable 7 is rotated and moved to the working position, the second fixing member 92 slides along the inclined surface of the connecting part 931 of the third fixing member 93. At the same time, one end of the second fixing member 92 overlaps the connecting part 931 of the third fixing member 93, thus pressing the second fixing member 92 and the third fixing member 93 together. The upper surface of the connecting part 931 is slightly higher than the bottom surface of the second fixing member 92 to pre-tighten the second fixing member 92 and prevent gaps between the second fixing member 92 and the third fixing member 93 to prevent them from moving up and down. Then, the second fixing member 92 and the third fixing member 93 are fixed with bolts.

[0148] When it is necessary to move the turntable 7, simply remove the bolts at the connection between the second fixing member 92 and the third fixing member 93, and the turntable 7 can be rotated and moved.

[0149] The thread rolling machine's slide system adopts a vertical layout design. During processing, the two beds 10 move vertically up and down. Therefore, the automated feeding system adopts a horizontal discharge design, using a servo electric cylinder to push the billet 34 horizontally into the heating coil 64. After heating, it continues to be pushed into the processing area for subsequent clamping and processing. After the product completes thread rolling, it falls into the sorting device below the slide due to its own gravity. Based on the feedback signal from the pressure process measurement sensor installed in the mold base, and through the judgment of the CNC system, the sorting device completes the separation of qualified and unqualified products.

[0150] like Figure 3 As shown, a certain space is left below the two beds 10 to prevent the return oil trough 11 from overflowing, so as to collect the cooling oil. The cooling oil will drip down into the return oil trough 11.

[0151] like Figure 1 , Figure 23 and Figure 24 As shown, a material distribution mechanism 12 is also provided below the processing space formed between the first thread rolling plate 204 and the second thread rolling plate 304. This material distribution mechanism 12 includes a material distribution hopper 121 with two discharge ports, a material distribution baffle 123 that guides qualified and unqualified products into the two discharge ports respectively, and a rotary cylinder 122 that controls the rotation of the material distribution baffle 123. The space inside the material distribution hopper 121 has upper and lower layers, separated by a partition 1211, which is inclined and extends to the locations of the two discharge ports.

[0152] The partition 1211 is covered with several small holes. The finished bolts have a certain amount of cooling oil on them. After the bolts fall onto the partition 1211, the cooling oil will fall into the space below the partition 1211 and be collected. The rotary cylinder 122 controls the rotation of the material distribution baffle 123, guiding qualified and unqualified products into two discharge ports respectively to screen the bolts.

[0153] The bottom of the hopper 121 has a pipe 124 for discharging the cooling oil collected in the hopper 121.

[0154] A stress sensor (not shown in the figure) is installed in either the left or right thread rolling die 2. When the billet 34 is extruded and rolled, the stress sensor can detect the magnitude of the thread rolling force. When the thread rolling force on a certain billet 34 exceeds the set value, it indicates that billets 34 of different diameters may have been mixed in, which means that the billet 34 is unqualified. Otherwise, it is qualified. Then the first thread rolling plate 204 and the second thread rolling plate 304 release the billet 34, and the billet 34 will fall directly into the distribution hopper 121.

[0155] See Figure 17 A receiving oil tank 32 is installed at the bottom of the turntable 7, and the receiving oil tank 32 is fixed to the bottom of the turntable 7 by a connector. Two material boxes 33 are placed inside the receiving oil tank 32, and the two material boxes 33 correspond to the two discharge ports of the distributing hopper 121, respectively, for collecting qualified and unqualified products. The bottom surface of the material boxes 33 has several small holes so that residual cooling oil on the bolt surface can fall into the receiving oil tank 32 through the small holes.

[0156] Once the material box 33 is full, unlock the connection between the turntable 7 and the machine body 1, and rotate the turntable 7 to one side to replace the material box 33, which is convenient and quick.

[0157] A control cabinet and CNC screen (not shown in the image) are also installed on the outside of the machine body for digital control of the thread rolling machine. The CNC system allows for micron-level precision control of the spacing and parallelism between the left and right beds and the thread rolling plates, as well as the position of each moving part. It can also interface with heaters and automation systems, integrating all components into the CNC system for centralized control and data transmission, improving feedback and response time and enhancing control stability. Furthermore, due to the high integration of the CNC system, monitoring and feedback of each bed, thread rolling plate, and other moving parts can be performed within the CNC system, enabling online monitoring of the entire machining process.

[0158] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A high-precision CNC thread rolling machine, characterized in that, include: The left thread rolling die (2) and the right thread rolling die (3) are arranged opposite to each other; Two servo drive mechanisms (8) are respectively connected to the left thread rolling die (2) and the right thread rolling die (3) to control the left thread rolling die (2) and the right thread rolling die (3) to move synchronously in opposite directions. The feeding mechanism (4) is used to transfer the blanks (34) one by one to the designated position; Heating mechanism (6) is used to induction heat the blank (34); The feeding mechanism (5) is used to pick up the blank (34) from the outlet of the feeding mechanism (4), and after being heated by the heating mechanism (6), it is transferred to the angle formed between the left thread rolling die (2) and the right thread rolling die (3); The left thread rolling die (2) includes a first thread rolling plate (204) and a taper adjustment mechanism (205) for controlling the first thread rolling plate (204) to deflect around a vertical axis; The right thread rolling die (3) includes a right fixed base (301), a right slide base (302) that can slide horizontally, a right die mounting base (303) that can deflect up and down relative to the right slide base (302), a second thread rolling plate (304) mounted on the right die mounting base (303), a parallelism adjustment mechanism (305) that controls the right die mounting base (303) to deflect around a horizontal axis, and a spacing adjustment mechanism (306) that controls the second thread rolling plate (304) to move closer to or further away from the first thread rolling plate (204). The spacing adjustment mechanism (306) includes a third adjustment block (3061) that can move up and down. The third adjustment block (3061) is located between the right slide base (302) and the right fixed base (301), and is in inclined engagement with the right slide base (302). The third adjustment block (3061) presses the right slide base (302) through the inclined surface, so that the right slide base (302) slides horizontally. The opposing surfaces of the first thread rolling plate (204) and the second thread rolling plate (304) have a plurality of tooth bodies adapted to the shape and helix angle of the thread being machined. The tooth bodies extend along the surfaces of the first thread rolling plate (204) and the second thread rolling plate (304), and a machining space is formed between the first thread rolling plate (204) and the second thread rolling plate (304). The first thread rolling plate (204) and the second thread rolling plate (304) each have a ramp area (3041) on their upper and lower edges on opposite sides, the ramp area (3041) being used to support and guide the blank (34) into the processing space.

2. The high-precision CNC wire rolling machine according to claim 1, characterized in that, The thread rolling machine also includes: The machine body (1) is integrally cast. The machine body (1) has a through-hole-shaped installation space in the middle. The two sides of the installation space are respectively provided with bed (10). The left thread rolling die (2) and the right thread rolling die (3) are respectively slidably connected to the opposite sides of the two bed (10). The two servo drive mechanisms (8) are respectively set above the two bed (10). A turntable (7) is capable of rotating around one side of the machine body (1). The feeding mechanism (4), the feeding mechanism (5), and the heating mechanism (6) are all mounted on the turntable (7).

3. The high-precision CNC thread rolling machine according to claim 2, characterized in that, The turntable (7) is provided with a mounting plate (71) and a centering adjustment mechanism (72) that can move along the distance between the left thread rolling die (2) and the right thread rolling die (3). The centering adjustment mechanism (72) is connected to the bottom of the mounting plate (71) via a transmission. The feeding mechanism (4), the feeding mechanism (5), and the heating mechanism (6) are all provided on the mounting plate (71).

4. The high-precision CNC thread rolling machine according to claim 2, characterized in that, The left thread rolling die (2) and the right thread rolling die (3) are respectively provided with load balancing cylinders (30). The telescopic ends of the two load balancing cylinders (30) are connected to the left thread rolling die (2) and the right thread rolling die (3) below, respectively, and the fixed ends are connected to the machine body (1).

5. The high-precision CNC thread rolling machine according to claim 2, characterized in that, The bottom of the mounting space of the machine body (1) is provided with an oil return groove (11), which extends to the bottom of the two beds (10). A cooling oil pipe (15) for injecting cooling oil into the processing space is provided above the left thread rolling die (2).

6. The high-precision CNC thread rolling machine according to claim 1, characterized in that, Below the processing space is a material distribution mechanism (12), which includes a material distribution hopper (121) with two discharge ports, a material distribution baffle (123) that guides qualified and unqualified products into the two discharge ports respectively, and a rotary cylinder (122) that controls the rotation of the material distribution baffle (123).

7. The high-precision CNC thread rolling machine according to claim 1, characterized in that, The top of the right thread rolling die (3) is provided with a pressing positioning mechanism (13) and an axial positioning mechanism (14). The pressing positioning mechanism (13) includes a pressure plate (133) that can be raised and lowered. The lower end of the pressure plate (133) can extend into the processing space between the first thread rolling plate (204) and the second thread rolling plate (304). The bottom surface of the pressure plate (133) is a horizontal surface. The axial positioning mechanism (14) includes a fixed-length positioning plate (141) that can move along the direction perpendicular to the distance between the first thread rolling plate (204) and the second thread rolling plate (304).

8. The high-precision CNC thread rolling machine according to claim 1, characterized in that, The left thread rolling die (2) also includes a left die mounting base (203) that can deflect around a vertical axis, and the right thread rolling die (3) also includes a right die mounting base (303) that can deflect around a horizontal axis. The left die mounting base (203) and the right die mounting base (303) are provided with mounting grooves on opposite sides, and a die base (206) is provided in the mounting groove. The first thread rolling plate (204) and the second thread rolling plate (304) are respectively held and fixed on the corresponding die base (206) by a fixing plate (2051).

9. The high-precision CNC thread rolling machine according to claim 8, characterized in that, The top surface of the first thread rolling plate (204) is inclined to fit with the mold base (206), and the bottom surface of the first thread rolling plate (204) is inclined to fit with the fixing block (22). The fixing block (22) can press the first thread rolling plate (204) onto the mold base (206) by pressing it with the inclined surface. The bottom surface of the second thread rolling plate (304) is inclined to fit with the mold base (206), and the top surface of the second thread rolling plate (304) is inclined to fit with the fixing block (22). The fixing block (22) can press the second thread rolling plate (304) onto the mold base (206) by squeezing it with the inclined surface.

10. The high-precision CNC thread rolling machine according to claim 9, characterized in that, The sides of the first thread rolling plate (204) and the second thread rolling plate (304) are pressed and fixed by the side fixing block (22). The mold base (206) is provided with a top pressure cylinder (26) and a screw (24). The side fixing block (22) has a waist-shaped hole in the middle. The screw (24) passes through the waist-shaped hole and is threaded to the nut (25). The top pressure cylinder (26) can apply outward pressure to one end of the side fixing block (22), so that the side fixing block (22) deflects towards the position of the first thread rolling plate (204) and the second thread rolling plate (304) with the nut (25) as the fulcrum, so as to press the sides of the first thread rolling plate (204) and the second thread rolling plate (304) together.

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