An intelligent CNC heading machine

Abstract

The present invention relates to the field of screw manufacturing and processing technology, and in particular to an intelligent CNC heading machine, which includes an impact treadmill assembly, an upper and lower walking platform assembly, a shearing and feeding assembly, a wire feeding assembly, an ejection assembly, and five drive assemblies. The drive assembly is mainly composed of a servo motor and a reducer, and the five servo motors are respectively the first, second, third, fourth and fifth servo motors. The first servo motor drives the crankshaft to rotate, and the crankshaft drives the impact treadmill to perform periodic reciprocating motion, and provides the motion coordinate axis of the electronic cam motion control curve for the intelligent CNC heading machine. The heading machine uses digital control technology to establish a set of electronic cam motion control curves of the five servo motor motion control mathematical models of the intelligent CNC heading machine, realizing the five mechanical cam connecting rod motion combinations of the traditional heading machine. The heading machine changes the machine adjustment work from manual labor, mechanical motion adjustment and empiricism to digital screen operation.

Description

Technical Field

[0001] The present invention relates to the technical field of screw manufacturing and processing, in particular to an intelligent numerical control heading machine. Background Art

[0002] Heading machines are cold heading equipment primarily used for forming the heads of screw products. Their operating principle involves straightening, feeding, shearing, and feeding the wire into the main die, followed by a first strike for initial forging and a second strike for ejecting the formed blank. Traditional single-die, two-strike heading machines typically utilize a single power mechanism. For example, an AC asynchronous motor drives a crankshaft through a V-belt and large and small pulleys, providing the travel and forming force for the impact platform. Simultaneously, the crankshaft generates a secondary axis through gears. This secondary axis, powered by a complex mechanism of cams, connecting rods, ratchets, and faceplates, provides power to the upper and lower platforms, shearing and feeding mechanisms, wire feeding mechanisms, and ejection mechanisms. These mechanisms also control the dynamic positional relationship between these four components and the crankshaft's main motion—a mechanical cam-connecting rod motion control curve. These mechanisms incorporate numerous moving and rotating pairs, and each product change or screw length adjustment requires complex physical and technical effort. Each mechanism is driven by a complex connecting rod cam transmission assembly, so every change in screw type and adjustment of the machine length for production screws is a complex physical and technical task, and there may be safety hazards for operators during the machine adjustment and line change operation.

[0003] For example, when adjusting the production of M6 screws from 50mm to 35mm, the mechanical cam motion curves for these two screw lengths differ for a traditional single-die, two-punch heading machine. This requires adjusting the spring seats on the connecting rod mechanisms of the upper and lower platforms with a mechanical wrench, shortening the screw length of the connecting rod in the feed mechanism, and specifically adjusting the faceplates in the wire feed and ejector mechanisms to adjust the start and end times of the mechanical cam motion due to the length change. These adjustments provide only directional guidance, not numerical assistance, and require repeated adjustments of the various mechanical cam mechanisms, followed by repeated measurements on commissioned products, to finalize the machine tuning. Most current heading machines lack variable frequency speed control, requiring only inching to verify the proper slow-motion motion of the mechanical cam. However, the formation of the screw head must be repeatedly tested at high speeds, leading to frequent safety accidents involving the hand press of the commissioning worker. Summary of the Invention

[0004] In view of this, the present invention provides an intelligent CNC heading machine to solve the above problems.

[0005] An intelligent CNC heading machine. It includes an impact treadmill assembly, an upper and lower platform assembly, a shearing and feeding assembly, a wire feeding assembly, an ejection assembly, and five drive assemblies respectively connected to the above five components. The impact treadmill assembly includes a crankshaft and an impact treadmill. The upper and lower platform assembly includes a dual-rod connecting rod shaft. The wire feeding assembly includes a main guide wheel. The drive assembly is mainly composed of a servo motor and a reducer. The five servo motors are a first servo motor connected to one side of the impact treadmill assembly, a second servo motor connected to one side of the upper and lower platform assembly, a third servo motor connected to one side of the shearing and feeding assembly, a fourth servo motor connected to one side of the wire feeding assembly, and a fifth servo motor connected to one side of the ejection assembly. The wire feeding assembly also includes a feeding sensor provided on one side of the shearing and feeding assembly for feeding back the blocking distance to the PLC control program. The first servo motor drives the crankshaft for rotational motion, which in turn drives the impact treadmill for periodic reciprocating motion and provides the motion coordinate axes of the electronic cam motion control curve for the intelligent CNC heading machine. The second, third, fourth, and fifth servo motors follow the coordinate axes of the electronic cam motion control curve provided by the first servo motor. The second servo motor drives the dual-link shaft for intermittent oscillation and provides high-precision position control for the upper and lower platform assemblies. The third servo motor achieves reciprocating motion for shearing and feeding using a gear and rack or reciprocating mechanism. The fourth servo motor controls the rotation angle of the capstan and the feed length of the wire. The fifth servo motor achieves reciprocating motion of the ejector pin and the ejection length using a gear and rack or reciprocating mechanism. The ejector assembly also includes a ejector sensor located on one side of the ejector pin for providing real-time feedback of its position to the PLC control program. The heading machine is adjusted and changed according to the electronic cam control coordinate parameter curve formed by the position coordinate relationship between the control movements of the second servo motor, the third servo motor, the fourth servo motor, and the fifth servo motor and the control movement of the first servo motor.

[0006] Furthermore, the second servo motor adopts a torque control mode and a position control mode to perform electronic cam following motion.

[0007] Furthermore, the third servo motor, the fifth servo motor, and the fourth servo motor perform electronic cam following motion using a position control mode.

[0008] Furthermore, the intelligent CNC heading machine establishes a coordinate system for the electronic cam movement through the rotation angle of the output end of the first servo motor and the movement distance of the impact treadmill, and establishes a coordinate system for the electronic cam following movement of the second servo motor, the third servo motor, the fourth servo motor, and the fifth servo motor.

[0009] Compared to the prior art, the intelligent CNC heading machine provided by the present invention utilizes the first, second, third, fourth, and fifth servo motors to drive the various components, making them independent of each other. This avoids the complex linkage and cam mechanisms associated with a single power source and significantly reduces the vibration and noise caused by mechanical cam motion. The intelligent CNC heading machine has control parameters set in standard integers (e.g., 50mm, 45mm, 40mm, 35mm, 30mm, etc.) in its factory recipe. This allows the operator to easily change the length from 50mm to 35mm based on the desired product length. The operator simply needs to call up the recipe and use a wrench to adjust the stopper and ejector components to the values ​​specified by the two laser position sensors, completing the machine setup process quickly and safely. For non-integer M6 lengths of 36mm, the intelligent CNC heading machine provided by the present invention allows the operator to adjust the parameters on the control screen based on the screw length and use the servo motor's slow motion to verify the appropriate electronic cam motion curve, enabling high-speed and safe production of the first M6*36 screw before a changeover. The intelligent CNC heading machine transforms the complex machine adjustment work from manual labor, mechanical motion adjustment and empiricism into digital screen operation, realizing an economical production model for large, medium and small batches of multiple varieties of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural schematic diagram of the intelligent CNC heading machine provided by the present invention.

[0011] Figure 2 for Figure 1 A structural diagram of the intelligent CNC heading machine from another perspective.

[0012] Figure 3 for Figure 1 The structural diagram of the intelligent CNC heading machine from the third perspective.

[0013] Figure 4 for Figure 1 Schematic diagram of the structure of the upper and lower platform components of the intelligent CNC heading machine.

[0014] Figure 5 This is a coordinate diagram of the "Intelligent CNC Heading Machine Electronic Cam Control Coordinate Parameter Curve" provided by the present invention.

[0015] Figure 6 for Figure 1 A schematic structural diagram of a material stop assembly of an intelligent CNC heading machine.

[0016] Explanation of the accompanying figures: platform body 10, wire feeding assembly 20, horizontal line wheel 21, vertical line wheel 22, main guide wheel 23, auxiliary guide wheel 24, feeding sensor 25, shearing feeding assembly 30, drag plate seat 31, drag plate 32, scissors shaft 33, knife clamp rod 34, upper and lower walking platform assembly 40, amphibious connecting rod shaft 41, slider 42, upper and lower running platforms 43, first die seat 45, second die seat 46, impact running platform assembly 50, crankshaft 51, impact connecting rod 52, impact running platform 53, ejection assembly 60, ejection rod 61, ejection sensor 62, drive assembly 70, first servo motor 71, second servo motor 72, third servo motor 73, fourth servo motor 74, fifth servo motor 75, material blocking assembly 80, material blocking arm 81, fixing screw 82. DETAILED DESCRIPTION

[0017] The following is a further detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0018] like Figure 1 As shown, it is a schematic structural diagram of the intelligent CNC heading machine provided by the present invention. The intelligent CNC heading machine includes a table body 10, a wire feeding assembly 20 arranged on the table body 10, a shearing and feeding assembly 30 arranged on one side of the wire feeding assembly 20, an upper and lower walking platform assembly 40 arranged on one side of the shearing and feeding assembly 30, an impact running platform assembly 50 arranged on one side of the upper and lower walking platform assembly 40, and an ejection assembly 60 arranged on one side of the shearing and feeding assembly 30. It is conceivable that the intelligent CNC heading machine also includes some other functional modules, such as a power module, a computer module, etc., which are technologies well known to those skilled in the art and will not be described in detail here.

[0019] It should be noted that the intelligent CNC heading machine replaces the complex mechanical cam drive control of the various components through five drive components 70 to perform the screw heading operation. The drive component 70 is mainly composed of a servo motor and a reducer. The five servo motors are a first servo motor 71 connected to one side of the impact treadmill assembly 50, a second servo motor 72 connected to one side of the upper and lower walking platform assembly 40, a third servo motor 73 connected to one side of the shear feeding assembly 30, a fourth servo motor 74 connected to one side of the wire feeding assembly 20, and a fifth servo motor 75 connected to one side of the ejection assembly 60.

[0020] The first servo motor 71 drives the impact treadmill assembly 50 to perform periodic reciprocating motion. The second servo motor 72 uses torque control and position control modes for electronic cam following motion. The third servo motor 73, the fourth servo motor 74, and the fifth servo motor 75 use position control modes for electronic cam following motion. Servo motor control modes primarily include three types: position control mode, speed control mode, and torque control mode. These three control modes are well known in the art and will not be described in detail here.

[0021] The platform body 10 is mainly used for installing and connecting various components, and the platform body 10 can be configured according to actual assembly requirements.

[0022] Please also refer to Figures 2 to 4 The wire feeding assembly 20 includes a plurality of horizontal line wheels 21 arranged at intervals and crosses, a plurality of vertical line wheels 22 arranged at intervals and crosses on one side of the horizontal line wheels 21, a main guide wheel 23 arranged on one side of the vertical line wheel 22, and a secondary guide wheel 24 arranged on one side of the main guide wheel 23, and a feeding sensor 25 arranged on one side of the shear feeding assembly 30.

[0023] The horizontal pulleys 21 rotate in a horizontal plane, and the steel passes between several of the horizontal pulleys 21 to achieve its horizontal plane guidance. The vertical pulleys 22 rotate perpendicularly to the horizontal pulleys 21, and the steel passes between several of the vertical pulleys 22 to achieve its vertical guidance.

[0024] The main guide wheel 23 and the auxiliary guide wheel 24 are in contact with each other, with a circular hole gap between them. The main guide wheel 23 is driven to rotate by the fourth servo motor 74, thereby driving the auxiliary guide wheel 24 to rotate. The steel passes between the main guide wheel 23 and the auxiliary guide wheel 24 and is moved by the rotation of the two guide wheels. The direction of movement of the steel is toward the shear feeding assembly 30, and the distance the steel moves is determined by the rotation angle of the main guide wheel 23. The fourth servo motor 74 controls the rotation angle of the main guide wheel 23, thereby accurately controlling the feeding distance of the steel, thereby facilitating the staff to perform line change and machine adjustment operations.

[0025] See also Figure 6 It should be noted that a stopper assembly 80 is provided on one side of the shear feed assembly 30. The stopper assembly 80 has a stopper arm 81, which corresponds to the output direction of the wire feed assembly 20. That is, the wire feed assembly 20 feeds steel and causes the end of the steel to abut against the stopper arm 81 of the stopper assembly 80. When the stopper position needs to be adjusted, the stopper distance of the stopper arm 81 can be changed by simply turning the fixing screw 82.

[0026] The feeding sensor 25 is a laser position sensor, which is electrically connected to the fourth servo motor 74, and the output end of the feeding sensor 25 is facing the blocking assembly 80, so as to obtain the current position of the blocking assembly 80 and feed back the blocking distance to the following PLC control program, thereby ensuring the feeding distance of the wire feeding assembly 20.

[0027] The shearing and feeding assembly 30 includes a carriage seat 31 fixedly arranged on one side of the platform body 10, a carriage 32 passing through the carriage seat 31, a scissor shaft 33 slidably arranged on the carriage seat 31, and a tool clamp rod 34 arranged on one side of the scissor shaft 33.

[0028] The output end of the third servo motor 73 is provided with a gear, and the side of the carriage 32 facing the third servo motor 73 is provided with a rack connected to the gear. In this way, the third servo motor 73 can, under the cooperation of the gear and rack or driven by a reciprocating motion device, cause the carriage 32 to reciprocate within the carriage seat 31. The reciprocating motion device includes but is not limited to a screw mechanism or a connecting rod cam mechanism. The technology for the cooperation between the scissor shaft 33 and the tool clamp rod 34 to shear and clamp the steel wire is prior art. The specific shearing and clamping conditions can be referred to the tool clamp rod anti-shake device disclosed in Chinese Patent CN201520791288.9.

[0029] The upper and lower platform assembly 40 includes a dual-rod shaft 41 provided at the output end of the second servo motor 72 , a slider 42 rotatably connected to the dual-rod shaft 41 , and an upper and lower treadmill 43 fixedly connected to the slider 42 .

[0030] The two ends of the amphibious connecting rod shaft 41 are rotatably arranged on the platform body 10, so that under the drive of the second servo motor 72, the amphibious connecting rod shaft 41 can intermittently swing around its axis and provide high-precision position control movement for the upper and lower platform assembly 40. The middle end of the amphibious connecting rod shaft 41 has two swing arms, and the ends of the two swing arms away from the amphibious connecting rod shaft 41 are rotatably connected to the slider 42. The upper and lower treadmills 43 are slidably arranged on the impact treadmill assembly 50, and their sliding direction is perpendicular to the sliding direction of the slider 42. The upper and lower treadmills 43 cooperate with the impact treadmill assembly 50 to complete the first and second punches of the workpiece, and the specific cooperation will be described below.

[0031] The impact treadmill assembly 50 includes a crankshaft 51 arranged at the output end of the first servo motor 71, an impact connecting rod 52 rotatably arranged on the crankshaft 51, and an impact treadmill 53 rotatably arranged at the end of the impact connecting rod 52 away from the crankshaft 51.

[0032] The first servo motor 71 is capable of driving the crankshaft 51 to rotate, thereby causing the impact connecting rod 52 to rotate at the connection point with the crankshaft 51. The impact treadmill 53 is slidably mounted on the platform body 10, with its sliding direction toward the upper and lower platform assembly 40 and perpendicular to the length of the crankshaft 51. In this way, the end of the impact connecting rod 52 away from the crankshaft 51 can drive the impact treadmill 53 to reciprocate on the platform body 10. The upper and lower treadmills 43 are slidably mounted on the side of the impact treadmill 53 away from the impact connecting rod 52. A first die holder 45 and a second die holder 46 are spaced apart on the side of the upper and lower treadmills 43 away from the impact treadmill 53. The arrangement direction of the first die seat 45 and the second die seat 46 is parallel to the sliding direction of the upper and lower running platforms 43. In this way, when the impact running platform 53 drives the upper and lower running platforms 43 to approach the workpiece, the first die seat 45 corresponds to the workpiece and performs a punching with it, and then the first servo motor 71 drives the impact running platform 53 to reset, and the upper and lower running platforms 43 move away from the workpiece and slide under the drive of the second servo motor 72 so that the second die seat 46 corresponds to the workpiece. In this way, after the impact running platform 53 drives the upper and lower running platforms 43 to approach the workpiece, the second die seat 46 performs a second punching with the workpiece, thereby completing the first punch and the second punch.

[0033] The ejection assembly 60 includes a ejection rod 61 disposed on one side of the fifth servo motor 75 , and a ejection sensor 62 disposed on one side of the ejection rod 61 .

[0034] The output end of the fifth servo motor 75 is provided with a gear. A rack, engaged with the gear, is provided on the side of the ejector rod 61 facing the fifth servo motor 75. The ejector rod 61 is oriented longitudinally toward the die position. Driven by the fifth servo motor 75, the ejector rod 61 reciprocates toward the die position through the coordination of the gear and rack, or through the drive of a reciprocating motion mechanism, thereby ejecting the workpiece after the die is punched, completing the ejection and discharge operation. The reciprocating motion mechanism includes, but is not limited to, a lead screw mechanism or a connecting rod cam mechanism.

[0035] The ejection sensor 62 is a laser position sensor electrically connected to the fifth servo motor 75. The output end of the ejection sensor 62 is directed toward the end of the ejection rod 61 that is away from the ejection die. This provides real-time feedback of the position of the ejection rod 61 to the PLC control program described below to ensure the ejection distance of the ejection rod 61 during the ejection operation.

[0036] like Figure 5 As shown, it is a coordinate diagram of the "Intelligent CNC Heading Machine Electronic Cam Control Coordinate Parameter Curve" provided by the present invention. The intelligent CNC heading machine establishes a motion coordinate system of the electronic cam motion control curve through the rotation angle (X-axis) of the output end of the first servo motor 71 and the movement distance (Y-axis) of the impact treadmill 53, providing the intelligent CNC heading machine with a motion coordinate axis of the electronic cam motion control curve. The second servo motor 72, the third servo motor 73, the fourth servo motor 74, and the fifth servo motor 75 start to perform electronic cam following motion according to the coordinate axis set by the electronic cam motion control curve of the first servo motor 71, thereby establishing the (Y-axis) coordinate system of the electronic cam following motion of the second servo motor 72, the third servo motor 73, the fourth servo motor 74, and the fifth servo motor 75, and drawing the "Intelligent CNC Heading Machine Electronic Cam Control Coordinate Parameter Curve" based on the positional relationship between the control motion of the second servo motor 72, the third servo motor 73, the fourth servo motor 74, and the fifth servo motor 75 and the control motion of the first servo motor 71. According to the coordinate parameter curve, the heading machine can be quickly and accurately adjusted and changed.

[0037] The electrical control system of the intelligent CNC heading machine consists of a PLC, a PLC control program, and a computer control screen. The PLC control program is organized and compiled in accordance with the "Coordinate Parameter Curve for Electronic Cam Control of Intelligent CNC Heading Machines." The PLC control program includes the settings for variable and fixed parameters within the control program, as well as the mathematical calculation methods and formulas within the control program. The specific calculation methods and formulas are readily understood by those skilled in the art as long as they are familiar with the working principles of the present invention. Therefore, these mathematical calculation methods and formulas themselves are considered prior art.

[0038] Compared with the prior art, the intelligent CNC heading machine provided by the present invention drives the operation of each component through the first servo motor 71, the second servo motor 72, the third servo motor 73, the fourth servo motor 74, and the fifth servo motor 75, so that the power between these components is independent of each other, thus avoiding the complex connecting rod mechanism, cam mechanism, etc. driven by a single power source, and greatly reducing the vibration and noise caused by the mechanical cam movement. The intelligent CNC heading machine sets the control parameters of standard integers such as 50mm, 45mm, 40mm, 35mm, 30mm... in the formula table when it leaves the factory. The debugger can easily change the length of the product to be produced from 50mm to 35mm. The debugger only needs to call out the formula and use a wrench to adjust the material stop assembly and the ejection assembly to the values ​​specified by the two laser position sensors to complete the machine adjustment work, which is fast and safe. For non-integer M6 lengths of 36mm, the intelligent CNC heading machine provided by this invention allows the operator to adjust parameters on the control screen based on the screw length, using the servo motor's slow motion to verify the appropriate electronic cam motion curve, thereby safely producing the first M6*36 screw before a changeover, with high-speed motion. This intelligent CNC heading machine transforms the complex machine adjustment work from manual labor, mechanical motion adjustment, and empirical experience into a digital screen operation, enabling the economical production of a wide variety of large, medium, and small batches of products.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements or improvements within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. An intelligent CNC heading machine, characterized by: The intelligent CNC heading machine includes an impact treadmill assembly, an upper and lower walking platform assembly, a shearing and feeding assembly, a wire feeding assembly, an ejection assembly, and five drive assemblies connected to the above five components respectively. The impact treadmill assembly includes a crankshaft and an impact treadmill. The upper and lower walking platform assembly includes a dual-rod connecting rod shaft. The wire feeding assembly includes a main guide wheel. The drive assembly is mainly composed of a servo motor and a reducer. The five servo motors are respectively a first servo motor connected to one side of the impact treadmill assembly, a second servo motor connected to one side of the upper and lower walking platform assembly, a third servo motor connected to one side of the shearing and feeding assembly, a fourth servo motor connected to one side of the wire feeding assembly, and a fifth servo motor connected to one side of the ejection assembly. The wire feeding assembly also includes a feeding sensor provided on one side of the shearing and feeding assembly for feeding back the blocking distance to the PLC control program. The first servo motor drives the crankshaft to rotate, and the crankshaft drives the impact treadmill to perform periodic reciprocating motion and provides power for the intelligent CNC heading. The machine provides a motion coordinate axis of an electronic cam motion control curve, and the second servo motor, the third servo motor, the fourth servo motor, and the fifth servo motor follow the coordinate axis of the electronic cam motion control curve provided by the first servo motor. The second servo motor drives the dual-rod shaft to swing intermittently and provides high-precision position control motion for the upper and lower platform components. The third servo motor realizes the reciprocating motion of shearing and feeding through a gear and rack or a reciprocating motion device. The fourth servo motor controls the rotation angle of the main wheel and controls the feeding length of the steel wire. The fifth servo motor realizes the reciprocating motion of the ejector rod and the ejection length through a gear and rack or a reciprocating motion device. The ejection assembly also includes a ejection sensor arranged on one side of the ejector rod for feeding back the position of the ejector rod to the PLC control program in real time. The heading machine is adjusted and changed according to the electronic cam control coordinate parameter curve formed by the position coordinate relationship between the control motion of the second servo motor, the third servo motor, the fourth servo motor, and the fifth servo motor and the control motion of the first servo motor.

2. The intelligent CNC heading machine according to claim 1, characterized in that: The second servo motor adopts torque control mode and position control mode to perform electronic cam following motion.

3. The intelligent CNC heading machine according to claim 1, characterized in that: The third servo motor, the fifth servo motor, and the fourth servo motor perform electronic cam following motion in a position control mode.

4. The intelligent CNC heading machine according to claim 1, characterized in that: The intelligent CNC heading machine establishes a coordinate system for the electronic cam movement through the rotation angle of the output end of the first servo motor and the movement distance of the impact treadmill, and establishes a coordinate system for the electronic cam following movement of the second servo motor, the third servo motor, the fourth servo motor, and the fifth servo motor.

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