In-mold tapping structure and in-mold tapping method

Abstract

The application relates to the technical field of hardware processing equipment, in particular to a cleaning-free tapping structure in a mold, a plurality of work stations are arranged in the mold, a tapping process is completed in the mold, the mold is provided with independent tapping work stations, a tapping mechanism is arranged in the tapping work station, the tapping mechanism is externally connected with a frequency conversion tapping machine, the tapping mechanism and an external tapping machine driving part are connected through a flexible shaft transmission, the frequency conversion tapping machine is provided with a PLC control part to control the driving part of the frequency conversion tapping machine, the whole tapping in the mold is mostly in operation time except feeding time, the extension of the operation time reduces the rotating speed of the tapping mechanism, the tap does not appear in an over-high temperature phenomenon, therefore, heavy oil operation is not needed, conventional stamping oil can be used, the process of cleaning after using heavy oil is avoided, and production and processing cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hardware processing equipment, in particular to a cleaning-free tapping structure in a mold and a tapping method in a mold. BACKGROUND

[0002] The conventional tapping in a mold relies on the up-and-down stroke of a punch to drive a tapping gear to tap. The tapping process is short in time, the tapping speed is super high, heavy oil must be used for tapping, and after the heavy oil is used, a cleaning process is needed, which is more complicated and increases the use cost of heavy oil.

[0003] Therefore, the conventional process is optimized, and a cleaning-free tapping structure in a mold and a tapping method in a mold are designed. SUMMARY

[0004] In order to solve the above problems, the present application provides a cleaning-free tapping structure in a mold and a tapping method in a mold, which does not need to use heavy oil in the tapping process, and also eliminates the subsequent cleaning process.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A cleaning-free tapping structure in a mold includes a mold, a plurality of tapping mechanisms and a tapping machine. The tapping machine is a variable frequency tapping machine. The mold includes an upper mold and a lower mold arranged oppositely. The mold is provided with a stamping station and an independent tapping station. The plurality of tapping mechanisms are arranged in the tapping station. The driving part of the tapping machine is provided with a flexible shaft. The tapping machine is connected with the tapping mechanisms through the flexible shaft. The tapping station is provided with an inductor which is electrically connected with the tapping machine.

[0007] Optionally, in an embodiment of the present application, the tapping mechanism includes a tap, a quick-change chuck, a guide rod, a guide sleeve, a fixing sleeve and a universal joint. The tap is installed on the quick-change chuck. The quick-change chuck is connected with the upper end of the guide rod. The guide rod is arranged in the fixing sleeve and the lower part of the guide rod is exposed outside the fixing sleeve. The guide sleeve is arranged on the lower part of the guide rod and connected with the fixing sleeve. The lower end of the guide rod is connected with the universal joint. The universal joint is provided with a flexible shaft which is drivingly connected with the tapping machine.

[0008] Optionally, in an embodiment of the present application, the upper mold is sequentially provided with an upper mold base, an upper mold gasket, an upper mold fixing plate, a punch fixing plate and an upper mold unloading plate from top to bottom.

[0009] Optionally, in an embodiment of the present application, the lower mold is sequentially provided with a concave die plate, a concave die gasket and a lower mold base from top to bottom.

[0010] Optionally, in an embodiment of the present application, the middle part and the edge of the tapping station are provided with liftable positioning rods. The positioning rods are connected with lifting drives.

[0011] Optionally, in an embodiment of the present application, a pressing block is arranged above the tap, and the pressing block is connected with the quick-drying oil pipe.

[0012] In an embodiment, the quick-drying oil pipe is further provided with an electromagnetic valve, and the electromagnetic valve is separately provided with a sensor; when tapping, the electromagnetic valve is opened to flow out the quick-drying oil; when not tapping, the electromagnetic valve is closed to avoid waste of the quick-drying oil; in an embodiment, the die cushion plate is provided with a quick-drying oil recovery pipe, one end of the quick-drying oil recovery pipe extends to the tapping mechanism position, and the quick-drying oil recovery pipe is used for recovering the excess quick-drying oil dripping.

[0013] A tapping-in-mold method, characterized in that: comprising the structure of the tapping-in-mold without cleaning mentioned above, and the method steps are as follows:

[0014] Step S1, after the material is flattened, the material is conveyed to a die stamping station through an automatic feeder;

[0015] Step S2, after the stamping station punches the whole material, the automatic feeder conveys the punched part of the material to a tapping station;

[0016] Step S3, the inductor senses the signal of the material being in place and sends the signal of the material being in place to the tapping machine, the positioning rod rises to fix the material according to the signal of the material being in place sent by the inductor, and sends a positioning signal to the tapping machine;

[0017] Step S4, the tapping machine taps the punching position on the material according to the positioning signal, and after tapping is completed, the tapping machine controls the tap to retreat;

[0018] Step S5, steps S2-S4 are repeated, and after the material is completely tapped, the work process is ended.

[0019] Optionally, in an embodiment of the present application, the feeder in step S1 adopts a step-by-step feeder.

[0020] Optionally, in an embodiment of the present application, the tapping machine in step S4 works according to the action signal of the positioning rod, specifically: when the positioning rod rises, the tapping machine controls the tapping mechanism to tap; and when the positioning rod descends, the tapping machine controls the tapping mechanism to retreat; the edge of the material is pre-punched with a positioning hole corresponding to the position of the positioning rod.

[0021] Optionally, in an embodiment of the present application, the punching work in step S2 is a flange round hole punching work.

[0022] Advantages of the present application

[0023] The in-mold tapping structure of the present invention adopts a frequency conversion tapping machine and sets an independent tapping station in the mold. The tapping mechanism is located in the tapping station and is connected to the frequency conversion tapping machine through a flexible shaft. The in-mold tapping time is extended, and the tap speed is reduced accordingly, avoiding the occurrence of ultra-high temperature. There is no need to use heavy oil for cooling, saving the cost of heavy oil and eliminating the need for subsequent cleaning procedures. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0025] Figure 1 Schematic diagram of the tapping station structure in Embodiment 1 of the present invention;

[0026] Figure 2 Schematic diagram of the tapping mechanism in Embodiment 1 of the present invention;

[0027] Figure 3 Schematic diagram of the process flow of Embodiment 1 of the present invention;

[0028] Explanation of reference numerals in the attached drawings: 1. Upper die base; 11. Upper die pad; 12. Upper die fixing plate; 13. Punch fixing plate; 14. Upper die unloading plate; 2. Lower die base; 21. Die pad; 22. Die template; 3. Tapping mechanism; 31. Tap; 32. Fixing sleeve; 33. Quick-change chuck; 34. Guide rod; 35. Guide sleeve; 36. Universal joint; 4. Pressure block; 41. Quick-drying oil pipe; 5. Positioning rod; 51. Lifting drive; 52. Positioning block; 6. Flexible shaft; 7. Support rod; Material A. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0030] Example 1

[0031] Existing in-mold tapping processes require heavy oil cooling due to the extremely high temperatures generated by the high-speed tap (31mm tap). Therefore, the existing process is optimized to eliminate the need for heavy oil cooling and subsequent cleaning, saving time and improving processing efficiency. Details are as follows:

[0032] like Figures 1-2As shown, a no-clean in-mold tapping structure includes a mold, several tapping mechanisms 3, and a tapping machine. The tapping machine is a frequency conversion tapping machine. The mold includes an upper mold and a lower mold arranged opposite each other. The mold has a stamping station and an independent tapping station, which are separately arranged within the mold. Several tapping mechanisms 3 are arranged in the tapping stations. The drive unit of the tapping machine is equipped with a flexible shaft 6, and the tapping machine is connected to the tapping mechanism 3 through the flexible shaft 6. A sensor is provided in the tapping station and electrically connected to the tapping machine.

[0033] The mold feeding and discharging directions are equipped with automatic feeders and automatic dischargers to realize automatic feeding and discharging of the in-mold tapping process, reducing manual intervention.

[0034] The tapping mechanism 3 includes a tap 31, a quick-change chuck 33, a guide rod 34, a guide sleeve 35, a fixed sleeve 32, and a universal joint 36. The tap 31 is installed in the quick-change chuck 33, which is connected to the upper end of the guide rod 34. The guide rod 34 is located inside the fixed sleeve 32, with its lower part protruding outside the fixed sleeve 32. The guide sleeve 35 is located at the lower part of the guide rod 34 and is connected to the fixed sleeve 32. The lower end of the guide rod 34 is connected to the universal joint 36, which is connected to a flexible shaft 6 for transmission connection with the tapping machine.

[0035] The upper die of the stamping station consists of, from top to bottom, the upper die base 1, the upper die pad 11, the upper die fixing plate 12, the punch fixing plate 13, and the upper die unloading plate 14. The upper die in the tapping station only retains the upper die base 1, so that a space is formed between the upper die and the lower die, which is convenient for observation and maintenance and does not affect the tapping operation. The stamping station performs the punching operation first and then the hole flanging operation.

[0036] The stamping station includes at least one front punching position, which can punch holes at multiple locations on material A.

[0037] The lower die consists of a concave template 22, a concave die pad 21, and a lower die base 2 from top to bottom. Several support rods 7 are provided at the bottom of the lower die to create an overhead space below the lower die. The flexible shaft 6 and the positioning rod 5 cylinder are both located at the bottom of the lower die. The overhead lower die facilitates the replacement and maintenance of parts in the future. Several elastic positioning rods 5 are provided on the edge of the lower die for precise positioning with the upper die during punching.

[0038] The die plate 21 is also equipped with a quick-drying oil recovery pipeline to recover excess quick-drying oil and minimize the pollution of the work area by quick-drying oil.

[0039] When material A is punched, it passes between the upper die stripper plate 14 and the concave die plate 22.

[0040] The tapping station is equipped with lifting positioning rods 5 in the middle and at the edges. In this embodiment, the front end of the positioning rod 5 is a frustum structure. The positioning rod 5 is connected to a lifting drive 51. A positioning block 52 is provided directly above the positioning rod 5. The positioning blocks 52 on both sides can prevent the edges of material A from warping, while the positioning block 52 in the middle can prevent the middle of material A from arching. The positioning block 52 in the middle can be installed on the mounting strips on both sides of the lower die.

[0041] A pressure block 4 is provided above the tap 31. The pressure block 4 is connected to a quick-drying oil pipe 41, which is connected to an external oil supply device. The pressure block 4 has an oil hole that is located directly above the tapping position. The quick-drying oil flows from the oil hole to the tapping position to lubricate the hole wall and cool it.

[0042] When tap 31 is tapping, the upper die is disengaged from the lower die, and the stamping and tapping are performed at different times.

[0043] The mold is a precision stamping and tapping integrated mold. The tapping machine is equipped with a servo motor driven tapping mechanism 3. The tapping machine is equipped with a PLC controller, which controls the components and servo motor according to the action signals of the sensor or other components, so that the tapping mechanism 3 can achieve precise continuous cyclic movement.

[0044] This tapping structure achieves highly automated in-mold tapping operations through multiple sensors, an automatic feeder, and an automatic discharger. It boasts high tapping efficiency, with the mold equipped with a separate tapping station and an external variable frequency tapping machine. Under the same operating time, the tapping operation time is extended, thereby reducing the tap speed and preventing overheating. Furthermore, it eliminates the need for heavy oil cooling, allowing the use of ordinary quick-drying oil, which extends the tap's lifespan and reduces tapping costs.

[0045] like Figure 3 As shown, an in-mold tapping method includes the aforementioned no-clean in-mold tapping structure, and the method steps are as follows:

[0046] Step S1: After being leveled, material A is conveyed to the stamping station inside the mold by an automatic feeder.

[0047] In this embodiment, material A is a sheet. After being flattened, the sheet is fed into the stamping station by an automatic feeder in a step-feeding manner.

[0048] In step S2, after the stamping station performs the punching operation on the entire material A, the automatic feeder transports the punched part of material A to the tapping station. Specifically, the punching operation is to perform a flanging round hole punching operation at the tapping position, and the positioning hole has been pre-punched at the position of the positioning rod 5 on the edge of material A so that the positioning rod 5 can be inserted into the positioning hole.

[0049] In step S3, the sensor detects the signal that the material is in place and sends the signal that material A is in place to the tapping machine. The positioning rod 5 rises to fix material A according to the signal that the material is in place sent by the sensor, and sends a positioning signal to the tapping machine.

[0050] Step S4: The tapping machine taps the punching position on material A according to the positioning signal. After tapping is completed, the tapping machine controls the tap to retract.

[0051] In this embodiment, the tap 31 rotates at 3000 r / min. After tapping is completed, the tapping machine controls the tap 31 to retract. The tapping machine operates according to the action signal of the positioning rod 5. Specifically, after the positioning rod 5 rises to fix the material A, the tapping machine controls the tapping mechanism 3 to tap. When the positioning rod 5 falls, the tapping machine controls the tapping mechanism 3 to retract. The tapping and retraction are achieved by the tapping machine driving the tap to rotate forward and backward.

[0052] Step S5: Repeat steps S2-S4. Once all material A has been tapped, the operation process ends.

[0053] This method improves the processing efficiency of in-mold tapping and saves on the cost of heavy oil.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A no-clean in-mold tapping structure, characterized in that: The device includes a mold, several tapping mechanisms, and a tapping machine. The tapping machine is a frequency conversion tapping machine. The mold includes an upper mold and a lower mold arranged opposite each other. The mold has a stamping station and an independent tapping station. Several tapping mechanisms are arranged in the tapping stations. The drive unit of the tapping machine is equipped with a flexible shaft. The tapping machine is connected to the tapping mechanism through the flexible shaft. A sensor is provided in the tapping station and electrically connected to the tapping machine. The tapping mechanism includes a tap; The lower mold consists of, from top to bottom, a concave template, a concave mold pad, and a lower mold base; The tapping station is equipped with a liftable positioning rod at the center and edge, and the positioning rod is connected to a lifting drive. The front end of the positioning rod is a frustum structure. The positioning rod is connected to a lifting drive. A positioning block is provided directly above the positioning rod. The positioning blocks on both sides can prevent the material edges from warping up, while the positioning block in the middle can prevent the material from arching in the middle. The positioning block in the middle is mounted on the mounting strips that are installed on both sides of the lower mold. A pressure block is provided above the tap, and the pressure block is connected to a quick-drying oil pipe. The quick-drying oil pipe is connected to an external oil supply device. The pressure block has an oil hole through it, and the oil hole is located directly above the tapping position. The quick-drying oil flows from the oil hole to the tapping position. The quick-drying oil pipe is also equipped with a solenoid valve, which is equipped with a separate sensor. When tapping, the solenoid valve opens and quick-drying oil flows out; when not tapping, the solenoid valve closes. The die pad is provided with a quick-drying oil recovery pipe, one end of which extends to the tapping mechanism to recover excess quick-drying oil that drips.

2. The no-clean in-mold tapping structure according to claim 1, characterized in that: The tapping mechanism further includes a quick-change chuck, a guide rod, a guide sleeve, a fixed sleeve, and a universal joint. The tap is installed in the quick-change chuck, which is connected to the upper end of the guide rod. The guide rod is located inside the fixed sleeve, with its lower part protruding outside the fixed sleeve. The guide sleeve is located at the lower part of the guide rod and is connected to the fixed sleeve. The lower end of the guide rod is connected to the universal joint, which is equipped with a flexible shaft that is connected to the tapping machine for transmission.

3. The no-clean in-mold tapping structure according to claim 1, characterized in that: The upper mold consists of, from top to bottom, an upper mold base, an upper mold pad, an upper mold fixing plate, a punch fixing plate, and an upper mold unloading plate.

4. An in-mold tapping method, characterized in that: Including the no-clean in-mold tapping structure as described in any one of claims 1-3, the method steps are as follows: Step S1: After being leveled, the material is conveyed to the stamping station inside the mold by an automatic feeder. Step S2: After the stamping station punches the entire material, the automatic feeder transports the punched part of the material to the tapping station. Step S3: The sensor detects the material arrival signal and sends the material arrival signal to the tapping machine. The positioning rod rises to fix the material according to the material arrival signal sent by the sensor and sends a positioning signal to the tapping machine. Step S4: The tapping machine taps the punching position on the material according to the positioning signal. After tapping is completed, the tapping machine controls the tap to retract. Step S5: Repeat steps S2-S4 until all material has been tapped, then end the operation.

5. The in-mold tapping method according to claim 4, characterized in that: In step S1, the feeder adopts a step feeding method.

6. The in-mold tapping method according to claim 4, characterized in that: In step S4, the tapping machine operates according to the action signal of the positioning rod. Specifically, when the positioning rod rises, the tapping machine controls the tapping mechanism to tap; when the positioning rod falls, the tapping machine controls the tapping mechanism to retract.

7. The in-mold tapping method according to claim 4, characterized in that: The punching operation in step S2 is a flanging round hole punching operation.

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