Automatic core rod stripping device on a press

Abstract

The application discloses a kind of automatic core rod de-coring devices on press, including upper spindle, upper core rod, connecting plate, guide pillar, backing plate, upper punch, female die and lower punch, upper spindle is fixedly connected with the hydraulic telescopic rod of press, the top of upper core rod is fixedly connected with upper spindle, connecting plate is fixedly connected with the bottom of upper spindle, the top of two guide pillars is respectively fixedly connected with connecting plate, backing plate is sleeved on two guide pillars, two guide pillars are slidably connected with backing plate, the top of guide pillar is provided with limiting ring for preventing backing plate from falling off from guide pillar, a spring is sleeved on each guide pillar, one end of spring is abutted with connecting plate, and the other end is abutted with backing plate;Upper punch is fixedly arranged on backing plate, upper core rod passes through connecting plate and upper punch, female die is fixedly arranged on the frame of press, the bottom of upper core rod and upper punch can be inserted into the cavity of female die, and the bottom of lower punch is fixedly connected with lower punch seat.The application effectively improves product quality, and avoids the phenomenon that the inner hole and outer diameter of product at two ends are inconsistent.

Description

Technical Field

[0001] This invention relates to the field of press technology, and in particular to an automatic core removal device for a press mandrel. Background Technology

[0002] In the production of powder metallurgy parts, the issue of inner hole accuracy for thin-walled parts with a large length-to-diameter ratio has always been a challenge. The equipment required for producing these parts generally doesn't require high pressure; 3T or 6T production equipment is sufficient. However, due to the lower mandrel structure of such equipment, finished products commonly exhibit problems such as inner hole bending, inconsistent hole sizes at both ends, and inconsistent outer diameters. The main reason for this problem is that the mandrel and die are in the same direction during finishing. During the upward and downward pressing process, the outer diameter of the product enters the die while the lower mandrel enters the product. This results in high friction as the product enters the die cavity. The product at the upward-pressing end experiences excessive extrusion pressure, leading to abnormal deformation such as bulging and increased density. After finishing and demolding, the large density difference and different elastic rebound rates at both ends result in inconsistent inner and outer diameters at both ends. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic core removal device for mandrels on presses, so as to solve the problems existing in the prior art, improve product quality, and avoid the phenomenon that the inner hole and outer diameter at both ends of the product are inconsistent.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides an automatic mandrel removal device for a press, comprising an upper spindle, an upper mandrel, a connecting plate, guide pillars, a pad, an upper punch, a female die, and a lower punch. The upper spindle is fixedly connected to the hydraulic telescopic rod of the press. The top end of the upper mandrel is fixedly connected to the upper spindle. The connecting plate is fixedly connected to the bottom end of the upper spindle. The top ends of the two guide pillars are respectively fixedly connected to the connecting plate. The pad is sleeved on the two guide pillars, and both guide pillars slide in cooperation with the pad. The top end of each guide pillar is provided with a feature for preventing... A limiting ring prevents the pad from detaching from the guide post. Each guide post is fitted with a spring, one end of which abuts against the connecting plate and the other end against the pad. The upper punch is fixed to the pad, the upper mandrel passes through the connecting plate and the upper punch, the female mold is fixed to the frame of the press, the bottom of the upper mandrel and the upper punch can extend into the cavity of the female mold, the bottom end of the lower punch is fixed to the lower punch seat, and the lower punch can slide with the cavity of the female mold.

[0006] Preferably, the upper spindle, the upper mandrel, the connecting plate, the pad, the upper punch, the cavity, and the lower punch are coaxial.

[0007] Preferably, a connecting block is provided on the top of the pad, and an adjusting nut is threadedly connected to the connecting block. The adjusting nut is located between the connecting plate and the pad.

[0008] Preferably, the top end of the upper mandrel is fixedly connected to the first connecting shaft, the top end of the first connecting shaft is fixedly connected to the bottom end of the second connecting shaft, the second connecting shaft is threadedly connected to the mandrel locking nut, the second connecting shaft is threadedly connected to the upper spindle, and the bottom end of the mandrel locking nut is tightly fitted to the top end of the upper spindle.

[0009] Preferably, the top end of the upper mandrel, the bottom end of the second connecting shaft, and the first connecting shaft are all located in the hollow portion of the upper main shaft.

[0010] Preferably, it also includes a conical air blowing pipe located on one side of the female mold, the conical air blowing pipe being connected to an air source, the conical air blowing pipe being used to blow out compressed air, thereby blowing the product off the female mold.

[0011] Preferably, the conical air blowing pipe is equipped with a solenoid valve, which is electrically connected to a limit switch. The limit switch is fixed next to the upper spindle, and a lever for actuating the limit switch is fixed on the side wall of the upper spindle.

[0012] The present invention achieves the following technical effects compared to the prior art:

[0013] The automatic core removal device for press mandrels of the present invention effectively improves product quality and avoids the phenomenon of inconsistent inner and outer diameters at both ends of the product. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0015] Figure 1 This is a schematic diagram of the automatic core removal device for the press of the present invention;

[0016] The components are as follows: 100. Automatic core removal device for the upper mandrel of the press; 1. Upper spindle; 2. Connecting plate; 3. Upper mandrel; 4. Guide post; 5. Spring; 6. Guide post locking nut; 7. Pad; 8. Graphite copper sleeve; 9. Upper punch; 10. Adjusting nut; 11. Product to be shaped; 12. Female mold; 13. Lower punch; 14. Conical air blowing pipe; 15. First connecting shaft; 16. Second connecting shaft; 17. Mandrel locking nut. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide an automatic core removal device for mandrels on presses, so as to solve the problems existing in the prior art, improve product quality, and avoid the phenomenon that the inner hole and outer diameter at both ends of the product are inconsistent.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown: This embodiment provides an automatic core removal device 100 for the upper mandrel of a press, including an upper spindle 1, an upper mandrel 3, a connecting plate 2, a guide post 4, a pad 7, an upper punch 9, a female die 12, and a lower punch 13.

[0021] The upper main shaft 1 is fixedly connected to the hydraulic telescopic rod of the press, and the top end of the upper mandrel 3 is fixedly connected to the upper main shaft 1. Specifically, the upper main shaft 1 is hollow, the top end of the upper mandrel 3 is fixedly connected to the first connecting shaft 15, the top end of the first connecting shaft 15 is fixedly connected to the bottom end of the second connecting shaft 16, the second connecting shaft 16 is threadedly connected to the mandrel locking nut 17, and the bottom end of the mandrel locking nut 17 is tightly fitted to the top end of the upper main shaft 1. The mandrel locking nut 17 is designed to prevent the threaded connection between the second connecting shaft 16 and the upper main shaft 1 from loosening, as a loose connection would cause the upper mandrel 3 to be unstable, thus affecting product quality. The top end of the upper mandrel 3, the bottom end of the second connecting shaft 16, and the first connecting shaft 15 are all located in the hollow part of the upper main shaft 1.

[0022] The connecting plate 2 is fixedly connected to the bottom end of the upper spindle 1. The top ends of the two guide pillars 4 are fixedly connected to the connecting plate 2 respectively. The top ends of the guide pillars 4 pass through the connecting plate 2 and are fixed by the guide pillar locking nut 6. The pad 7 is sleeved on the two guide pillars 4. Both guide pillars 4 are slidably fitted with the pad 7. The top end of the guide pillar 4 is provided with a limiting ring to prevent the pad 7 from falling off the guide pillar 4. Each guide pillar 4 is fitted with a spring 5. One end of the spring 5 abuts against the connecting plate 2 and the other end abuts against the pad 7. The spring 5 is always in a compressed state. The pad 7 is provided with a through hole corresponding to each guide pillar 4. A graphite copper sleeve 8 is fixedly installed in each through hole. The guide pillar 4 and the graphite copper sleeve 8 are slidably fitted. The graphite copper sleeve 8 provides lubrication and guidance for the relative displacement between the guide pillar 4 and the pad 7. The graphite copper sleeve 8 and the pad 7 are interference fit, and the graphite copper sleeve 8 and the guide pillar 4 are clearance fit.

[0023] The upper punch 9 is fixed on the pad 7. The upper mandrel 3 passes through the connecting plate 2 and the upper punch 9. The female mold 12 is fixed on the frame of the press. The bottom of the upper mandrel 3 and the upper punch 9 can extend into the cavity of the female mold 12. The bottom end of the lower punch 13 is fixed to the lower punch seat. When the lower punch seat moves up and down, it can drive the lower punch 1 to slide and engage with the cavity of the female mold 12. That is, the female mold 12 is fixed, while the top of the lower punch 13 can extend into the cavity of the female mold 12 and move up and down in the cavity of the female mold 12.

[0024] The upper spindle 1, upper mandrel 3, connecting plate 2, pad 7, upper punch 9, cavity and lower punch 13 are coaxial.

[0025] A connecting block is provided on the top of the pad 7, and an adjusting nut 10 is threaded onto the connecting block. The adjusting nut 10 is located between the connecting plate 2 and the pad 7. By rotating the adjusting nut 10, the connection length between the adjusting nut 10 and the connecting block can be adjusted, which can correct the length error of the upper punch 9 during the manufacturing process.

[0026] The automatic core removal device 100 for the press in this embodiment also includes a conical air blowing pipe 14 located on one side of the female mold 12. The conical air blowing pipe 14 is connected to an air source and is used to blow out compressed air to blow away the product on the female mold 12. A solenoid valve is provided on the conical air blowing pipe 14. The solenoid valve is electrically connected to a limit switch, and the opening and closing of the solenoid valve on the conical air blowing pipe 14 is controlled by the limit switch. Specifically, the limit switch is located next to the upper spindle 1 and is fixed in place. A lever for actuating the limit switch is fixed on the side wall of the upper spindle 1. The lever moves with the movement of the upper spindle 1. It should be noted that the lever can actuate the limit switch during both the upward and downward strokes of the upper spindle 1, thereby triggering the limit switch. During the upward stroke of the upper spindle 1, the lever actuates the limit switch, causing it to open. The limit switch opens the solenoid valve, allowing compressed air to be blown out of the conical air blowing pipe 14. During the downward stroke of the upper spindle 1, the lever actuates the limit switch, causing it to close. The limit switch closes the solenoid valve, preventing compressed air from being blown out of the conical air blowing pipe 14.

[0027] The working principle of the automatic core removal device 100 for the press core bar in this embodiment is as follows:

[0028] (1) When the upper spindle 1 moves downward, the upper mandrel 3 first penetrates into the inner hole of the product to be shaped 11 for a period of time, and then the product to be shaped 11 enters the female mold 12. In this way, the product to be shaped 11 is subjected to bidirectional force during the process of entering the mold. The two ends of the product to be shaped 11 are subjected to uniform force and consistent deformation, which effectively solves the problems of inner hole bending and inconsistent inner hole outer diameter.

[0029] (2) During the downward movement of the upper spindle 1, the force on the pad 7 gradually increases, and the spring 5 is gradually compressed until the top surface of the adjusting nut 10 is in contact with the bottom surface of the connecting plate 2. When the upper spindle 1 reaches the bottom dead center, the pressing process is completed. When the upper spindle 1 moves upward and enters the demolding stage, the compressed spring 5 releases its compression force, pushing the pad 7 and the upper punch 9 downward until the end face of the upper punch 9 leaves the upper mandrel 3. This ensures that the shaped product is completely separated from the upper mandrel 3, thus completing the demolding process.

[0030] (3) After demolding, the conical air blowing pipe 14 controlled by the limit switch will open, and the discharged compressed air will blow away the shaped product to avoid the shaped product from accumulating on the equipment table.

[0031] In the description of this invention, it should be noted that the terms "center," "top," "bottom," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An automatic knockout device for a press core rod, characterized by: The utility model provides a kind of injection mould, including upper spindle, upper core rod, connecting plate, guide pillar, backing plate, upper punch, female die and lower punch, the upper spindle is fixed with the hydraulic telescopic rod of press machine, the top of the upper core rod is fixed with the upper spindle, the bottom of the upper spindle is fixed with the connecting plate, the top of two guide pillars is respectively fixed with the connecting plate, the backing plate is sleeved on two guide pillars, two guide pillars are slidably connected with the backing plate, the top of guide pillar is provided with limiting ring for preventing the backing plate from falling off from the guide pillar, one end of spring is abutted with the connecting plate, the other end is abutted with the backing plate;Upper punch is fixed on the backing plate, the upper core rod passes through the connecting plate and the upper punch, the female die is fixed on the frame of press machine, the bottom of the upper core rod and the upper punch can be inserted into the cavity of female die, the bottom of lower punch is fixed with lower punch seat, and the lower punch can be slidably connected with the cavity of female die; The top of the backing plate is provided with a connecting block, the connecting block is threadedly connected with an adjusting nut, and the adjusting nut is located between the connecting plate and the backing plate;The top of the upper core rod is fixed with a first connecting shaft, the top of the first connecting shaft is fixed with the bottom of a second connecting shaft, the second connecting shaft is threadedly connected with a core rod locking nut, the second connecting shaft is threadedly connected with the upper spindle, and the bottom of the core rod locking nut is closely attached to the top of the upper spindle.

2. The automatic core knockout device for on-press core rods as claimed in claim 1, characterized in that: The upper spindle, the upper core rod, the connecting plate, the backing plate, the upper punch, the cavity and the lower punch are coaxial.

3. The automatic core knockout device for on-press core rods as claimed in claim 1, characterized in that: The top of the upper core rod, the bottom of the second connecting shaft and the first connecting shaft are located in the hollow portion of the upper spindle.

4. The automatic core knockout device for on-press core rods of claim 1, wherein: A conical air blowing pipe is arranged on one side of the female die, the conical air blowing pipe is connected with a gas source, and the conical air blowing pipe is used for blowing compressed air to blow away the product on the female die.

5. The automatic core knockout device for on-press core rods as set forth in claim 4, characterized in that: An electromagnetic valve is arranged on the conical air blowing pipe, the electromagnetic valve is electrically connected with a travel switch, the travel switch is fixed beside the upper spindle, and a lever is fixed on the side wall of the upper spindle to actuate the travel switch.

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