Die structure of a cold header and method of using same

Abstract

The present application relates to fastener cold heading forming equipment technical field, disclose a kind of die structure of cold header and its using method, including machine body and front punch fixed seat and rear die fixed module, sliding fit with cold heading sliding table module in machine body, punch adjusting module is fixed on cold heading sliding table module, and front punch fixed seat is assembled in punch adjusting module.The belt material detection mechanism of the present application is set, when there is belt material on punch, in the process that lift link mechanism presses down movable ram assembly, probe assembly is blocked by belt material, so that belt material is pushed off or movable ram assembly is compressed, so that the pressure of annular pressure sensor is instantaneously increased, so that the pressure signal is transmitted to the electric control system, and the stop alarm operation is carried out, so that the operator can timely find out and avoid the abnormal cold header to continue working, cause mold damage to further increase and equipment jam, machine and other difficult to repair in short time fault occurs, so as to provide a layer of protection for continuous operation of equipment.

Description

Technical Field

[0001] This invention relates to the field of fastener cold heading equipment technology, and in particular to a mold structure for a cold heading machine and its usage method. Background Technology

[0002] In modern industrial systems, cold heading is used to process fasteners such as bolts, nuts, and rivets, effectively improving material utilization. Cold heading equipment enables automated production, boasts high efficiency, and offers superior mechanical properties and machining precision compared to traditional cutting methods. Therefore, cold heading is widely used. In bolt production, using progressive dies for cold heading further enhances processing efficiency. However, existing cold heading machines still have the following problems in the production of bolts: During continuous processing, if unexpected situations such as material spillage occur, the cold heading machine will not alarm or stop, making it highly susceptible to damage to the mold under subsequent impacts. This not only results in mold loss but also delays production time due to downtime for replacement. Furthermore, when adding an optical monitoring structure to monitor this situation, the optical sensor is easily affected by oil mist and sludge formed by dust generated from overheated lubricating oil during cold heading, causing unstable operation. In addition, the existing equipment mostly uses a pipeline to continuously supply oil to the cold heading punch, resulting in a large amount of lubricating oil flowing directly into the bottom groove during punch reset, wasting resources in the oil supply system. Summary of the Invention

[0003] The purpose of this invention is to provide a mold structure for a cold heading machine and its usage method in order to solve the technical problems of difficulty in effectively monitoring the material carried by the punch during the production process of existing cold heading machines, and the waste of resources caused by continuous oil supply to the punch in existing cold heading production.

[0004] The present invention achieves the above objectives through the following technical solutions: A mold structure for a cold heading machine includes a machine body, a front punch fixing seat and a rear die fixing module for material forming, a cold heading slide module slidably fitted inside the machine body, a punch adjustment module fixed on the cold heading slide module, and the front punch fixing seat assembled in the punch adjustment module. The machine body also includes... The transmission plate assembly is located above the cold heading slide module, and its two sides are engaged with the machine body. The transmission plate assembly is also connected to the punch adjustment module to form a reciprocating sliding structure that is synchronized with the punch adjustment module. The lifting linkage mechanism is located between the front punch fixed seat and the rear mold fixed module and is fixed to the machine body. The lifting linkage mechanism is equipped with multiple vertical sliding structures. The vertical sliding structures cooperate with the transmission plate assembly through the linkage to form a lifting reciprocating structure driven by the transmission plate assembly. One end of the lifting linkage mechanism is fixed with a material detection mechanism for material detection. The material detection mechanism includes a lifting sleeve fixed on a lifting linkage mechanism. An annular pressure sensor is embedded in the top of the inner hole of the lifting sleeve. A movable pressure head assembly is fitted below the annular pressure sensor and slides in the inner hole of the lifting sleeve. A probe assembly is fixed below the movable pressure head assembly. The movable pressure head assembly transmits pressure to the annular pressure sensor for reading. Through the coordination of the lifting linkage mechanism and the reciprocating motion of the cold heading, the probe assembly is driven to reciprocate and probe in real time to detect abnormal pressure and determine the material condition.

[0005] Preferably, the transmission plate assembly includes limiting slides fixed on both sides of the machine body, slide rails slidingly fitted inside the limiting slides, bosses provided on the inner sides of both slide rails, and a transmission truss fixed on both bosses. Fixed supports are fixed at both ends of the upper surface of the punch adjustment module, and a first connecting rod is connected between the fixed supports and the bosses.

[0006] Preferably, the lifting linkage mechanism includes fixed brackets fixed on both sides of the machine body, a guide rod mounting plate fixed on the fixed bracket, a plurality of sliding guide rods fixed on the guide rod mounting plate corresponding to the front punch fixed seat, a lifting slide table slidably fitted on the sliding guide rod, a hinge rod hinged to one end of the lifting slide table, a hinge support hinged to the other end of the hinge rod, and the hinge support is fixed on the transmission truss.

[0007] Preferably, the lifting slide includes a limiting connector sleeved on the sliding guide rod. The limiting connector is used to connect the hinge rod and the material detection mechanism. A linear bearing is embedded in the middle position of the limiting connector, and the limiting connector slides on the sliding guide rod through the linear bearing.

[0008] Preferably, the movable pressure head assembly includes a pressure head that is slidably fitted in the lifting sleeve. A sliding rod is fixed to the top of the pressure head. The sliding rod passes through the top of the lifting sleeve and the annular pressure sensor. A retaining ring is provided above the lifting sleeve. A pressure equalizing plate is provided on the lower end face of the annular pressure sensor. The pressure equalizing plate is slidably fitted on the outer wall of the sliding rod. A compression spring is provided between the pressure equalizing plate and the pressure head. The compression spring is sleeved on the outer wall of the sliding rod.

[0009] Preferably, the retaining ring is fixedly connected to the sliding rod, and the retaining ring is used to limit the sliding rod when the lifting linkage mechanism drives the lifting sleeve to rise.

[0010] Preferably, the retaining ring and the sliding rod are in sliding fit, the top of the sliding rod is provided with a threaded structure, and a limit nut is provided at the threaded structure of the sliding rod. The position of the pressure head in the sliding rod can be adjusted by adjusting the exposed length of the sliding rod.

[0011] Preferably, it also includes an intermittent oil supply mechanism, the material detection mechanism and the intermittent oil supply mechanism are slidably engaged in the inner cavity, the bottom of the lifting sleeve is provided with a limiting ring that cooperates with the intermittent oil supply mechanism, and the probe assembly includes a push rod for push detection, and an oil injection plug for cooperating with the intermittent oil supply mechanism is fixed on the outer wall of the push rod.

[0012] Preferably, the intermittent oil supply mechanism includes an oil pipe limiting frame fixed to one side of a fixed support. Multiple oil injection pipes are slidably fitted on the oil pipe limiting frame corresponding to the position of the forward thrust fixed seat. A lifting sleeve is slidably fitted in the inner hole of the oil injection pipe. A limiting port is provided at the top of the oil injection pipe. A return spring is provided between the lower end face of the limiting port and the oil pipe limiting frame. A limiting cover plate is fixed to the upper end face of the oil injection pipe by bolts. The limiting cover plate is slidably fitted with the outer wall of the lifting sleeve. The lower section of the oil injection pipe is divided into an oil storage chamber and an oil injection chamber. A push rod passes through the bottom of the oil injection chamber. The oil injection plug and the inner hole of the oil injection chamber are a mating mechanism. A buffer spring is provided between the oil injection plug and the bottom of the oil injection chamber. An oil injection nozzle is provided at the bottom of the oil injection chamber corresponding to the position of the forward thrust fixed seat. An oil supply system is connected to the transition connection between the oil storage chamber and the oil injection chamber. The pipe body and upper section of the oil storage chamber are provided with air holes for oil injection and venting.

[0013] The present invention also provides a method for using a mold structure of a cold heading machine, comprising the following steps: a. Install the transmission plate assembly, lifting linkage mechanism, material detection mechanism and intermittent oil supply mechanism of the mold structure of a cold heading machine onto the machine body, and complete the stroke adjustment so that the set mechanism is adapted to the reciprocating cold heading action of the machine body; b. Connect the ring pressure sensor to the electrical control system of the cold heading machine, and adjust the normal operating range of the pressure value measured by the ring pressure sensor. When the front punch fixed seat is reset during continuous operation of the cold heading machine, the lifting linkage mechanism is pulled by the transmission plate assembly, so that the bottom of the probe assembly of the material detection mechanism is pushed down to detect the material. If the front punch fixed seat is carrying material, the reaction force of the probe assembly is transmitted to the ring pressure sensor through the movable pressure head assembly. The reading of the ring pressure sensor increases abnormally, causing the equipment to stop and triggering the alarm light at the same time. c. Synchronously with the annular pressure sensor, the oil supply system and the oil injection pipe are connected. When the die is being punched at the front punch fixed seat, the material detection mechanism is pulled up, which in turn drives the intermittent oil supply mechanism to rise. During this period, the probe assembly of the material detection mechanism is pulled up before the oil injection pipe, causing the oil injection plug to disengage from the oil injection chamber. The lubricating oil injected by the oil supply system enters the oil injection chamber through the gap between the bottom of the oil injection plug and the oil injection chamber. When the die is reset, the lubricating oil is gradually sprayed out along the oil injection nozzle to the front punch fixed seat by pushing the oil injection plug. During this cycle, when the viscosity of the lubricating oil increases, the reaction force received by the oil injection plug when it pushes and sprays oil increases. This force is transmitted to the annular pressure sensor through the movable pressure head assembly, increasing the pressure on it. The annular pressure sensor is set in the electrical control system and calibrated within the pressure reading range during normal cold heading operations. When the reading of the annular pressure sensor exceeds the set range, the system alarm is triggered, allowing operators to detect the problem in time and choose an appropriate time to stop the machine for maintenance.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The transmission plate assembly, lifting linkage mechanism, and material detection mechanism of this invention use a ring pressure sensor as the detection signal component to monitor the equipment. When there is material on the punch, during the process of the lifting linkage mechanism pressing down the movable pressure head assembly, the probe assembly is blocked by the material, causing the material to be pushed down or the movable pressure head assembly to be compressed. This causes a sudden increase in pressure on the ring pressure sensor, which transmits the pressure signal to the electrical control system to trigger a shutdown alarm, allowing operators to detect the problem promptly. In this way, even if the operators fail to detect the equipment abnormality, the equipment can automatically determine the material situation and take emergency measures, preventing the cold heading machine from continuing to operate after an abnormality occurs, which could lead to further damage to the mold and equipment jamming or stalling, which are difficult to repair in a short time. This provides an extra layer of protection for continuous operation of the equipment.

[0015] 2. The intermittent oil supply mechanism of this invention, through the relative movement between the intermittent oil supply mechanism and the lifting sleeve, allows the oil supply system to inject stored oil into the oil injection pipe. During the return stroke of the punch, lubricating oil is continuously squeezed out and applied to it. This process is repeated, ensuring that the punch is precisely lubricated after each operation. Simultaneously, the oil quantity can be adjusted according to the equipment's operating speed and the lubricating oil's condition, avoiding the waste of resources caused by large amounts of lubricating oil flowing directly into the bottom tank and extending the service life of the lubricating oil.

[0016] 3. The intermittent oil supply mechanism of this invention gradually increases the pressure on the annular pressure sensor to its maximum value as the oil injection plug moves to its lowest point. Then, as the punch strikes the die again, the lifting sleeve resets under the action of the lifting slide, and the pressure on the annular pressure sensor gradually decreases. During this periodic change, the stroke and speed of the oil injection plug remain constant. Therefore, when the concentration of lubricating oil in the oil injection pipe increases, the required pressure increases when the lifting sleeve presses down on the probe assembly, causing the reading of the annular pressure sensor to exceed its original range. This allows the system to determine the state of the lubricating oil and issue an alarm signal through the electronic control system, prompting operators to adjust, maintain, or change the oil in the oil supply system, thus preventing quality problems in the processed products or damage to the mold due to lubricating oil performance issues. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an assembly diagram of the mold structure of a cold heading machine according to the present invention; Figure 2 This is a schematic diagram of the body structure of the mold structure of a cold heading machine according to the present invention; Figure 3 This is a schematic diagram of the transmission plate assembly structure of the mold structure of a cold heading machine according to the present invention; Figure 4 This is a schematic diagram of the lifting linkage mechanism of the mold structure of a cold heading machine according to the present invention; Figure 5 This is a schematic diagram of the material detection structure of the mold structure of a cold heading machine according to the present invention; Figure 6 This is a schematic diagram of the internal structure of the material detection structure described in this invention; Figure 7 This is a top view of the mold structure of a cold heading machine according to the present invention; Figure 8 This is the present invention. Figure 7 Sectional view along the middle AA; Figure 9 This is the present invention. Figure 8 A magnified view of area B in the middle; Figure 10 This is the present invention. Figure 8 A magnified view of area C in the middle; Figure 11This is an exploded view of the material detection mechanism and intermittent oil supply mechanism described in this invention.

[0019] The reference numerals in the attached drawings are explained as follows: 1. Machine body; 2. Cold heading slide module; 3. Punch adjustment module; 4. Front punch fixing seat; 5. Rear die fixing module; 6. Transmission plate assembly; 7. Lifting linkage mechanism; 8. Material detection mechanism; 9. Intermittent oil supply mechanism; 41. Punch; 61. Fixed support; 62. First connecting rod; 63. Boss; 64. Slide rail; 65. Limiting slide; 66. Transmission truss; 71. Fixed bracket; 72. Guide rod mounting plate; 73. Sliding guide rod; 74. Lifting slide; 75. Hinge rod; 76. Hinge support; 81. Lifting sleeve; 82. Movable pressure head assembly. Components; 83. Ring pressure sensor; 84. Probe assembly; 91. Oil pipe limit bracket; 92. Oil injection pipe; 93. Return spring; 94. Limit cover plate; 95. Oil supply system; 96. Oil injection nozzle; 97. Air hole; 98. Buffer spring; 741. Limit connector; 742. Linear bearing; 811. Limit retaining ring; 821. Sliding rod; 822. Retaining ring; 823. Compression spring; 824. Pressure bearing head; 825. Limit nut; 831. Pressure equalizing plate; 841. Top rod; 842. Oil injection plug; 921. Oil injection chamber; 922. Oil storage chamber; 923. Limit pipe port. Detailed Implementation

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-11 As shown, a mold structure for a cold heading machine includes a machine body 1, a front punch fixing seat 4 for material forming, and a rear mold fixing module 5. The front punch fixing seat 4 is used to fix the punch 41. A cold heading slide module 2 is slidably fitted inside the machine body 1. A punch adjustment module 3 is fixed on the cold heading slide module 2, and the front punch fixing seat 4 is assembled in the punch adjustment module 3. The entire structure of the machine body 1 is not shown in the accompanying drawings. The machine body 1 is an integral structure including a flywheel-driven power transmission assembly and a rear mold crankshaft mechanism. In the field, this part of the structure tends to be mature and modular, and this part of the structure does not involve the improvements made by this invention. However, the fixed connection methods with the machine body 1 involved in this invention include, but are not limited to, the installation methods shown in the figures.

[0023] The transmission plate assembly 6 is located above the cold heading slide module 2, and its two sides cooperate with the machine body 1. The transmission plate assembly 6 is also connected to the punch adjustment module 3, forming a reciprocating sliding structure synchronized with the punch adjustment module 3. The lifting linkage mechanism 7 is located between the front punch fixing seat 4 and the rear die fixing module 5, and is fixed to the machine body 1. The lifting linkage mechanism 7 has multiple vertical sliding structures, which cooperate with the transmission plate assembly 6 through connecting rods to form a lifting reciprocating structure driven by the transmission plate assembly 6. One end of the lifting linkage mechanism 7 is fixed with a material detection mechanism 8 for material detection. The lifting linkage mechanism 7 and the transmission plate assembly 6 are the transmission components of this invention. The position of the lifting linkage mechanism 7 needs to be adjusted according to the stroke of the punch 41. It is fixedly installed with the machine body 1 according to the actual equipment use to fix the position of the lifting linkage mechanism 7. Then, the connection between the lifting linkage mechanism 7 and the transmission plate assembly 6 is adjusted according to specific needs. The transmission plate assembly 6 slides with both sides of the machine body 1 and is connected to the punch adjustment module 3 to obtain power. This method can avoid the reaction force of the lifting linkage mechanism 7 from acting directly on the mold. With the help of the machine body 1 for limiting, the load in the non-design direction is absorbed, which plays a role in protecting the mold. At the same time, the mold material is more difficult to modify and process than the machine body 1, and may affect the processing accuracy. The modular design facilitates the replacement and maintenance of the parts of the transmission plate assembly 6 and the lifting linkage mechanism 7.

[0024] As one embodiment of the present invention, such as Figure 5 and 6As shown, the material detection mechanism 8 includes a lifting sleeve 81 fixed on the lifting linkage mechanism 7. The top of the lifting sleeve 81 is machined with a connecting part for fixed connection with the lifting linkage mechanism 7. A rectangular groove is opened on the body of the lifting sleeve 81. An annular pressure sensor 83 is embedded in the top of the inner hole of the lifting sleeve 81. The rectangular groove is used for the wiring of the annular pressure sensor 83. A movable pressure head assembly 82 is fitted below the annular pressure sensor 83 and slides in the inner hole of the lifting sleeve 81. A probe assembly 84 is fixed below the movable pressure head assembly 82. The movable pressure head assembly 82 transmits pressure to the annular pressure sensor 83 for reading. Through the coordination of the lifting linkage mechanism 7 and the cold heading reciprocating motion, the probe assembly 84 is driven to reciprocate and probe in real time to detect abnormal pressure and judge the material condition.

[0025] In actual operation, the cold heading slide module 2 is driven by the power system in the machine body 1 to reciprocate within the machine body 1 for cold heading. During this process, the punch adjustment module 3 and the front punch fixing seat 4 reciprocate linearly with the cold heading slide module 2. They are connected to the punch adjustment module 3 through the transmission plate assembly 6, thereby driving the transmission plate assembly 6 to reciprocate linearly synchronously with the cold heading slide module 2. The lifting linkage mechanism 7 is fixed above the front punch fixing seat 4 according to its stroke, and the lifting part of the lifting linkage mechanism 7 is fixed to the machine body 1. Its linkage steering part is connected to the transmission plate assembly 6. Under the action of the linkage steering part, the lifting part of the lifting linkage mechanism 7 moves vertically with the transmission plate assembly 6. The reciprocating lifting motion is perpendicular to the direction of movement of the front punch fixed seat 4. When the front punch fixed seat 4 drives the punch 41 to punch forward, the lifting linkage mechanism 7 is raised. When the punch 41 is reset, the lifting linkage mechanism 7 is lowered. Through the lifting sleeve 81 fixed on the lifting linkage mechanism 7, the movable pressure head assembly 82 and the probe assembly 84 are driven to lift and probe. When there is material on the punch 41, during the process of the lifting linkage mechanism 7 pressing down the movable pressure head assembly 82, the probe assembly 84 is blocked by the material, causing the material to be pushed down or the movable pressure head assembly 82 to be compressed. This causes the pressure on the annular pressure sensor 83 to increase instantaneously, thereby transmitting the pressure signal to the electrical control system to perform a shutdown alarm operation, so that the operator can detect it in time. In this way, even if the operator fails to detect the abnormality of the equipment, the equipment can automatically judge the material situation and take emergency measures, avoiding the cold heading machine from continuing to work after the abnormality occurs, which would cause further damage to the mold and equipment jamming and other faults that are difficult to repair in a short time. This provides a layer of protection for the continuous operation of the equipment.

[0026] As one embodiment of the present invention, such as Figure 2-3As shown; the transmission plate assembly 6 includes limiting slides 65 fixed on both sides of the machine body 1. The limiting slides 65 are fixed to the upper end face of the machine body 1 and both sides of the cold heading slide module 2 by bolts. The limiting slides 65 are slidably fitted with slide rails 64. The inner sides of the slide rails 64 at both ends are provided with bosses 63. The two bosses 63 are fixed together with a transmission truss 66. The bosses 63 are integrally formed with the slide rails 64. The upper end face of the punch adjustment module 3 is fixed with fixed supports 61 at both ends. The fixed supports 61 and the bosses 63 are connected by a first connecting rod 62. The first connecting rod 62 is rotatably connected to the fixed supports 61. The first connecting rod 62 is fixedly connected to the bosses 63.

[0027] As one embodiment of the present invention, such as Figure 2-4 As shown in the figure, the lifting linkage mechanism 7 includes fixed brackets 71 fixed on both sides of the machine body 1. The fixed brackets 71 are fixedly connected to the machine body 1 as a support structure. The fixing method shown in the figure is an installation example. Holes can be drilled on the machine body 1 to fix it according to the specific debugging conditions of different equipment. A guide rod mounting plate 72 is fixed on the fixed bracket 71. A plurality of sliding guide rods 73 are fixed on the guide rod mounting plate 72 corresponding to the front punch fixing seat 4. A plurality of mounting holes are opened on the guide rod mounting plate 72. The sliding guide rods 73 are snapped into the mounting holes, and one end of the sliding guide rods 73 passing through the guide rod mounting plate 72 is fixed by bolts. A lifting slide 74 is slidably fitted on the sliding guide rods 73. The lifting slide 74 and the sliding guide rods 73 are a mating mechanism. Under the guidance and limitation of the sliding guide rods 73, the lifting slide 74 can only move up and down along the sliding guide rods 73. A hinge rod 75 is hinged to one end of the lifting slide 74. The two ends of the hinge rod 75 are provided with... Figure 4 The length adjustment structure shown can be adjusted according to the actual installation position. The other end of the hinge rod 75 is hinged to a hinge support 76, and the hinge support 76 is fixed to the transmission truss 66. The hinge support 76 includes a base fixed to the transmission truss 66 and a connecting arm whose end rotatably engages with the base.

[0028] As one embodiment of the present invention, such as Figure 4 As shown, the lifting slide 74 includes a limiting connector 741 sleeved on the sliding guide rod 73. The limiting connector 741 is used to connect the hinge rod 75 and the material detection mechanism 8. A linear bearing 742 is embedded in the middle position of the limiting connector 741, and the limiting connector 741 slides on the sliding guide rod 73 through the linear bearing 742. As a connecting component, the limiting connector 741 is snapped and fixed to the linear bearing 742. The linear bearing 742 changes the sliding friction between the lifting slide 74 and the sliding guide rod 73 to rolling friction between the balls of the linear bearing 742 and the sliding guide rod 73, making the sliding of the lifting slide 74 smoother.

[0029] In specific operation, during the cold heading process, the reciprocating motion of the cold heading slide module 2 drives the transmission plate assembly 6 to slide back and forth in the same direction. During the movement of the transmission plate assembly 6, the hinge support 76 fixed to it moves, causing the hinge support 76 to push and pull the hinge rod 75. The guide rod mounting plate 72 connected to the other end of the hinge rod 75 is limited in the horizontal direction by the sliding guide rod 73, thereby causing the guide rod mounting plate 72 to move up and down along the sliding guide rod 73.

[0030] As one embodiment of the present invention, such as Figure 5-6 As shown; the movable pressure head assembly 82 includes a pressure bearing head 824 that is slidably fitted in the lifting sleeve 81. A sliding rod 821 is fixed to the top of the pressure bearing head 824. The sliding rod 821 is clearance-fitted with the center hole of the annular pressure sensor 83. The sliding rod 821 passes through the top of the lifting sleeve 81 and the annular pressure sensor 83. A retaining ring 822 is provided above the lifting sleeve 81. When the lifting sleeve 81 rises, the retaining ring 822 drives the movable pressure head assembly 82 to move upward as a whole. A pressure equalizing plate 831 is provided on the lower end face of the annular pressure sensor 83. The pressure equalizing plate 831 is slidably fitted on the outer wall of the sliding rod 821. A compression spring 823 is provided between the pressure equalizing plate 831 and the pressure bearing head 824. The compression spring 823 is sleeved on the outer wall of the sliding rod 821. The pressure equalizing plate 831 and the pressure bearing head 824 transmit pressure through the compression spring 823. The pressure equalizing plate 831 can evenly transmit the pressure to the sensing component of the annular pressure sensor 83. The retaining ring 822 is fixedly connected to the sliding rod 821. The retaining ring 822 is used to limit the sliding rod 821 when the lifting linkage mechanism 7 drives the lifting sleeve 81 to lift.

[0031] In specific operation, the retaining ring 822 in this embodiment is fixedly connected to the sliding rod 821. When the lifting sleeve 81 is pulled upward by the lifting linkage mechanism 7, the retaining ring 822 limits the sliding rod 821, causing the sliding rod 821, the pressure head 824, and the probe assembly 84 to move upward. When the lifting linkage mechanism 7 presses the lifting sleeve 81 downward, the upper end face of the inner hole of the lifting sleeve 81 presses down on the annular pressure sensor 83. The pressure is transmitted to the pressure head 824 through the compression spring 823, which drives the probe assembly 84, which is fixed to the pressure head 824, to move downward synchronously. When there is material stuck to the surface, the lifting sleeve 81 is fixed in stroke under the action of the lifting linkage mechanism 7. At this time, the probe assembly 84 moves downward and is blocked by the material head. The compression spring 823 is compressed, and the pressure on the annular pressure sensor 83 increases. If the stuck material head is pushed off or the compression spring 823 is compressed upward, the reading of the annular pressure sensor 83 in the electrical control system will increase abnormally, thereby controlling the equipment to stop and issuing an alarm signal.

[0032] As one embodiment of the present invention, such as Figure 8-11As shown; the retaining ring 822 and the sliding rod 821 are slidably engaged. The top of the sliding rod 821 is provided with a threaded structure, and a limit nut 825 is fitted at the threaded structure of the sliding rod 821. By adjusting the exposed length of the sliding rod 821, the position of the pressure head 824 in the sliding rod 821 can be adjusted. In this embodiment, by adjusting the engagement relationship between the retaining ring 822 and the sliding rod 821, the relative position between the probe assembly 84 and the lifting sleeve 81 can be adjusted, thereby adjusting... Figure 9 The size of region a shown.

[0033] As one embodiment of the present invention, such as Figure 8-11 As shown; it also includes an intermittent oil supply mechanism 9, a material detection mechanism 8 that slides within the cavity of the intermittent oil supply mechanism 9, a limiting ring 811 at the bottom of the lifting sleeve 81 that cooperates with the intermittent oil supply mechanism 9, and a probe assembly 84 including a push rod 841 for push detection, and an oil plug 842 fixed on the outer wall of the push rod 841 for cooperating with the intermittent oil supply mechanism 9.

[0034] As one embodiment of the present invention, such as Figure 8-11As shown, the intermittent oil supply mechanism 9 includes an oil pipe limiting frame 91 fixed to one side of the fixed bracket 71. The installation position of the oil pipe limiting frame 91 is set according to the position of the fixed bracket 71. Multiple oil injection pipes 92 are slidably fitted on the oil pipe limiting frame 91 corresponding to the position of the forward thrust fixed seat 4, and the lifting sleeve 81 is slidably fitted in the inner hole of the oil injection pipe 92. The oil injection pipe 92 is coaxial with the probe assembly 84. The top of the oil injection pipe 92 is provided with a limiting port 923, which cooperates with the oil pipe limiting frame 91 to limit the downward displacement limit of the oil injection pipe 92. A return spring 93 is provided between the lower end face of the limiting pipe port 923 and the oil pipe limiting bracket 91. The return spring 93 is sleeved on the outer wall of the oil injection pipe 92. When the oil injection pipe 92 is pulled up, its return movement is prioritized by the material detection mechanism 8, so as to quickly raise it to make way for the movement of the punch 41 and avoid interference with the action of the punch 41. The upper end face of the oil injection pipe 92 is fixed with a limiting cover plate 94 by bolts, and the limiting cover plate 94 slides with the outer wall of the lifting sleeve 81. When the lifting sleeve 81 is raised, the cooperation between the limiting retaining ring 811 and the limiting cover plate 94 causes the lifting sleeve 81 to pull the oil injection pipe 92 upward. The lower section of the oil injection pipe 92 is divided into an oil storage chamber 922 and an oil injection chamber 921. The push rod 841 passes through the bottom of the oil injection chamber 921. The oil injection plug 842 and the inner hole of the oil injection chamber 921 are a mating mechanism. The piston movement of the oil injection plug 842 and the oil injection chamber 921 is realized by the relative displacement between the probe assembly 84 and the oil injection pipe 92. A buffer spring 98 is provided between the bottom of the oil injection plug 842 and the oil injection chamber 921, which provides support and buffer for the oil injection plug 842. An oil injection nozzle 96 is provided at the bottom of the oil injection chamber 921 corresponding to the position of the front punch fixing seat 4. An oil supply system 95 is externally connected to the transition connection between the oil storage chamber 922 and the oil injection chamber 921. The upper section of the pipe body of the oil storage chamber 922 has vent holes 97 for oil injection and venting. Filtered lubricating oil is injected into the oil reservoir 922 from the oil supply system 95. The pressure in the oil reservoir 922 is balanced with the external pressure through the air hole 97, which facilitates the injection of lubricating oil into the oil reservoir 922. At the same time, the lubricating oil in the oil reservoir 922 is naturally replenished into the oil injection chamber 921.

[0035] In practical operation, unlike the previous embodiment, in this embodiment, the movable pressure head assembly 82 is as follows: Figure 8-10 As shown, the retaining ring 822 and the sliding rod 821 are fitted with a clearance. By adjusting the limit nut 825, the distance between the pressure head 824 and the bottom of the inner hole of the lifting sleeve 81 is adjusted, thereby adjusting the maximum distance between the push rod 841 fixed on the pressure head 824 and the bottom of the oil injection chamber 921. This allows the amount of oil flowing into the oil storage chamber 922 and the oil injection chamber 921 to be controlled when the oil injection plug 842 reciprocates in the oil injection pipe 92. That is, adjusting the limit nut 825 adjusts the amount of oil flowing into the oil storage chamber 922 and the oil injection chamber 921. Figure 9 The size of region a shown is used to adjust the amount of oil sprayed from the oil nozzle 96 to the punch 41 during one upsetting.

[0036] During the cold heading die punching process, the lifting slide 74 is pushed upward, causing the lifting sleeve 81 to move upward. At this time, the probe assembly 84 is pulled upward, and under the action of the buffer spring 98, the oil injection plug 842 begins to move away from the oil injection cavity 921. Simultaneously, the oil injection pipe 92 begins to return upward under the action of the return spring 93. As the lifting sleeve 81 and the probe assembly 84 gradually rise, the return spring 93 completes its return, and the lifting sleeve 81 gradually moves away from the oil injection pipe 92. During this process, the oil injection plug 842 moves further away from the oil injection cavity 921 until the limit ring 811 is in contact with the limit cover plate 94. At this time, the distance between the oil injection plug 842 and the oil injection cavity 921 is at its maximum. During the process of the oil injection plug 842 leaving the oil injection cavity 921, the lubricating oil injected into the oil storage cavity 922 through the oil supply system 95 flows through... Figure 9 As shown in region a, the oil flows into the injection chamber 921 through the gap. When the punch 41 returns to its original position, the lifting sleeve 81 is pulled downwards. At this time, the lifting sleeve 81, through the movable pressure head assembly 82, pushes the probe assembly 84 downwards, causing it to move with the lifting sleeve 81. Simultaneously, the oil injection pipe 92 also moves downwards to the support position of the return spring 93. Then, the oil injection plug 842 squeezes the oil in the oil injection pipe 92 downwards. During this process, the oil injection plug 842 gradually moves towards the bottom of the oil injection chamber 921, continuously squeezing out lubricating oil to coat the punch 41 during its return stroke. This process repeats, ensuring precise oiling of the punch 41 after each operation. It also allows for oil volume adjustment based on the equipment's operating speed and lubricating oil condition, preventing excessive lubricating oil from flowing directly into the bottom tank and extending the lubricating oil's service life.

[0037] After the oil injection pipe 92 moves downward to the support position of the return spring 93, the oil injection plug 842 continues to move downward under the push of the movable pressure head assembly 82. At this time, the return spring 93 begins to compress. As the oil injection plug 842 gradually moves to the lowest point, the pressure on the annular pressure sensor 83 gradually increases to its maximum value. Then, as the punch 41 punches the die again, the lifting sleeve 81 returns to its original position under the action of the lifting slide 74, and the pressure on the annular pressure sensor 83 gradually decreases. In this periodic change, the stroke and speed of the oil injection plug 842 remain constant. Therefore, when the concentration of lubricating oil in the oil injection pipe 92 increases, the pressure required for the lifting sleeve 81 to press down on the probe assembly 84 increases, causing the reading of the annular pressure sensor 83 to exceed its original range. This allows the operator to know the state of the lubricating oil and issue an alarm signal through the electronic control system, prompting the operator to adjust, maintain, or change the oil in the oil supply system 95 to avoid quality problems in the processed products or damage to the mold due to lubricating oil performance issues.

[0038] The present invention also provides a method for using a mold structure of a cold heading machine, comprising the following steps: a. Install the transmission plate assembly 6, lifting linkage mechanism 7, material detection mechanism 8 and intermittent oil supply mechanism 9 of the mold structure of a cold heading machine onto the machine body 1, and complete the stroke adjustment so that the set mechanism is adapted to the reciprocating cold heading action of the machine body 1; b. Connect the ring pressure sensor 83 to the electrical control system of the cold heading machine, and adjust the normal operating range of the pressure value measured by the ring pressure sensor 83. When the front punch fixed seat 4 is reset during continuous operation of the cold heading machine, the lifting linkage mechanism 7 is pulled by the transmission plate assembly 6, so that the bottom of the probe assembly 84 of the material detection mechanism 8 is pushed downward to detect the material. If the front punch fixed seat 4 is carrying material, the reaction force of the probe assembly 84 is transmitted to the ring pressure sensor 83 through the movable pressure head assembly 82. The reading of the ring pressure sensor 83 increases abnormally, causing the equipment to stop and triggering the alarm light at the same time. c. Synchronously with the annular pressure sensor 83, the oil supply system 95 and the oil injection pipe 92 are connected. When the front punch fixing seat 4 punches the die, the material detection mechanism 8 is pulled up, which drives the intermittent oil supply mechanism 9 to rise. During this period, the probe assembly 84 of the material detection mechanism 8 is pulled up before the oil injection pipe 92, causing the oil injection plug 842 to disengage from the oil injection cavity 921. The lubricating oil injected by the oil supply system 95 enters the oil injection cavity 921 through the gap between the bottom of the oil injection plug 842 and the oil injection cavity 921. When the die is reset, the lubricating oil enters the oil injection cavity 921 through the gap between the bottom of the oil injection plug 842 and the oil injection cavity 921. 2. The pusher gradually sprays the lubricating oil along the oil injection nozzle 96 onto the front punch fixed seat 4. During this cycle, when the viscosity of the lubricating oil increases, the reaction force on the oil injection plug 842 that pushes the oil injection increases. This force is transmitted to the annular pressure sensor 83 through the movable pressure head assembly 82, increasing its pressure. The annular pressure sensor 83 is set in the electrical control system and calibrated within the pressure reading range during normal cold heading operations. When the reading of the annular pressure sensor 83 exceeds the set range, the system alarm is triggered, allowing the operator to promptly detect the problem and choose an appropriate time to stop the machine for maintenance.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A mold structure for a cold heading machine, comprising a machine body (1) and a front punch fixing seat (4) and a rear mold fixing module (5) for material forming, wherein a cold heading slide module (2) is slidably fitted inside the machine body (1), a punch adjustment module (3) is fixed on the cold heading slide module (2), and the front punch fixing seat (4) is assembled in the punch adjustment module (3), characterized in that: It also includes, The transmission plate assembly (6) is located above the cold heading slide module (2), and its two sides are in cooperation with the machine body (1). The transmission plate assembly (6) is connected to the punch adjustment module (3) to form a reciprocating sliding structure synchronized with the punch adjustment module (3). The lifting linkage mechanism (7) is located between the front punch fixed seat (4) and the rear mold fixed module (5) and is fixed to the machine body (1). The lifting linkage mechanism (7) is provided with multiple vertical sliding structures. The vertical sliding structures cooperate with the transmission plate assembly (6) through the linkage to form a lifting reciprocating structure driven by the transmission plate assembly (6). One end of the lifting linkage mechanism (7) is fixed with a material detection mechanism (8) for material detection. The material detection mechanism (8) includes a lifting sleeve (81) fixed on the lifting linkage mechanism (7). A ring pressure sensor (83) is embedded in the top of the inner hole of the lifting sleeve (81). A movable pressure head assembly (82) is fitted below the ring pressure sensor (83). The movable pressure head assembly (82) is slidably fitted in the inner hole of the lifting sleeve (81). A probe assembly (84) is fixed below the movable pressure head assembly (82). The movable pressure head assembly (82) transmits pressure to the ring pressure sensor (83) for reading. Through the lifting linkage mechanism (7) and the cold heading reciprocating motion, the probe assembly (84) is driven to reciprocate and probe in real time to detect abnormal pressure and judge the material condition. The transmission plate assembly (6) includes limiting slides (65) fixed on both sides of the body (1). Slide rails (64) are slidably fitted inside the limiting slides (65). Bosses (63) are provided on the inner sides of both slide rails (64). Transmission trusses (66) are fixed on both bosses (63). Fixed supports (61) are fixed at both ends of the upper end face of the punch adjustment module (3). A first connecting rod (62) is connected between the fixed supports (61) and the bosses (63). The lifting linkage mechanism (7) includes fixed brackets (71) fixed on both sides of the body (1), a guide rod mounting plate (72) fixed on the fixed brackets (71), a plurality of sliding guide rods (73) fixed on the guide rod mounting plate (72) corresponding to the front punch fixed seat (4), a lifting slide (74) slidingly engaged on the sliding guide rod (73), a hinge rod (75) hinged to one end of the lifting slide (74), a hinge support (76) hinged to the other end of the hinge rod (75), and the hinge support (76) fixed on the transmission truss (66).

2. The mold structure of a cold heading machine according to claim 1, characterized in that: The lifting slide (74) includes a limiting connector (741) sleeved on the sliding guide rod (73). The limiting connector (741) is used to connect the hinge rod (75) and the material detection mechanism (8). A linear bearing (742) is embedded in the middle position of the limiting connector (741), and the limiting connector (741) slides on the sliding guide rod (73) through the linear bearing (742).

3. The mold structure of a cold heading machine according to claim 2, characterized in that: The movable pressure head assembly (82) includes a pressure head (824) that is slidably fitted in the lifting sleeve (81). A sliding rod (821) is fixed on the top of the pressure head (824). The sliding rod (821) passes through the top of the lifting sleeve (81) and the annular pressure sensor (83). A retaining ring (822) is provided above the lifting sleeve (81). A pressure equalizing plate (831) is provided on the lower end face of the annular pressure sensor (83). The pressure equalizing plate (831) is slidably fitted on the outer wall of the sliding rod (821). A compression spring (823) is provided between the pressure equalizing plate (831) and the pressure head (824). The compression spring (823) is sleeved on the outer wall of the sliding rod (821).

4. The mold structure of a cold heading machine according to claim 3, characterized in that: The retaining ring (822) is fixedly connected to the sliding rod (821). The retaining ring (822) is used to limit the sliding rod (821) when the lifting linkage mechanism (7) drives the lifting sleeve (81) to lift.

5. The mold structure of a cold heading machine according to claim 4, characterized in that: The retaining ring (822) is slidably engaged with the sliding rod (821). The top of the sliding rod (821) is provided with a threaded structure. A limit nut (825) is provided at the threaded structure of the sliding rod (821). The position of the pressure head (824) in the sliding rod (821) is adjusted by adjusting the exposed length of the sliding rod (821).

6. The mold structure of a cold heading machine according to claim 5, characterized in that: It also includes an intermittent oil supply mechanism (9), a material detection mechanism (8) that slides within the cavity of the intermittent oil supply mechanism (9), a limiting stop ring (811) that cooperates with the intermittent oil supply mechanism (9) at the bottom of the lifting sleeve (81), and a probe assembly (84) that includes a push rod (841) for push detection, and an oil plug (842) for cooperating with the intermittent oil supply mechanism (9) fixed on the outer wall of the push rod (841).

7. The mold structure of a cold heading machine according to claim 6, characterized in that: The intermittent oil supply mechanism (9) includes an oil pipe limiting frame (91) fixed on one side of the fixed bracket (71). Multiple oil injection pipes (92) are slidably fitted on the oil pipe limiting frame (91) corresponding to the position of the forward fixed seat (4). The lifting sleeve (81) is slidably fitted in the inner hole of the oil injection pipe (92). The top of the oil injection pipe (92) is provided with a limiting port (923). A return spring (93) is provided between the lower end face of the limiting port (923) and the oil pipe limiting frame (91). The upper end face of the oil injection pipe (92) is fixed with a limiting cover plate (94) by bolts. The limiting cover plate (94) is slidably fitted with the outer wall of the lifting sleeve (81). The lower section of the oil injection pipe (92) is divided into an oil storage chamber (922) and an oil injection chamber (921). The push rod (841) passes through the bottom of the oil injection chamber (921). The oil injection plug (842) and the inner hole of the oil injection chamber (921) are a mating mechanism. A buffer spring (98) is provided between the oil injection plug (842) and the bottom of the oil injection chamber (921). An oil injection nozzle (96) is provided at the bottom of the oil injection chamber (921) corresponding to the position of the front punch fixing seat (4). An oil supply system (95) is connected to the transition connection between the oil storage chamber (922) and the oil injection chamber (921). The pipe body and the upper section of the oil storage chamber (922) are provided with air holes (97) for oil injection and venting.

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