Punching rod of hydraulic machine

Abstract

The utility model provides a hydraulic press punch rod and relates to the technical field of hydraulic press accessories, the hydraulic press punch rod comprises a punch rod, a punch head and a pin shaft which are arranged in the vertical direction, a protrusion is arranged at the lower end of the punch rod, a groove is formed in the upper end of the punch head, a first connecting hole is formed in the protrusion, and a second connecting hole is formed in the groove; the first connecting hole and the second connecting hole can be communicated with each other, and after the pin shaft is inserted into the first connecting hole and the second connecting hole which are communicated with each other, the punch rod and the punch head can be detachably connected together. According to the hydraulic press punching rod, the two detachable parts which are connected through the pin shaft are arranged, when the punching head is abraded till the use condition is not met, the punching head needs to be replaced, the punching rod and the punching head do not need to be integrally detached during replacement, the pin shaft is directly taken out from the connecting position of the punching rod and the punching head, and a new punching head is replaced, so that the overhaul strength and cost are greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic press accessories, and in particular to a hydraulic press punch. Background Art

[0002] A hydraulic press is a machine that uses the static pressure of liquid to process metal, plastic, rubber, wood, powder and other products. It is often used in pressing and forming processes, such as forging and stamping. The punch is the main structure for transmitting force in the hydraulic press. Its role in the hydraulic press is to press the material. In the process of the hydraulic press pressing the material, the punch needs to be in direct contact with the material (for example, in the particle steel hot pressing block production line, the punch is in contact with the high-temperature hot pressing raw material), which will cause the punch to wear and deform.

[0003] The punch rods of existing hydraulic presses are typically either one-piece or split-piece with threaded connections. For one-piece punch rods, the punch head accounts for one-third of the total length. During operation, if the punch head wears out, the entire rod must be replaced. During this replacement process, technicians must remove the entire rod from the hydraulic press, increasing the labor intensity and difficulty for workers and causing material loss. For split-piece punch rods with threaded connections, the threads can loosen and are susceptible to deformation under high pressure and high temperature. This makes it difficult to remove the punch head from the rod when it is necessary to replace it. Utility Model Content

[0004] The present application provides a hydraulic press punch rod, which is used to facilitate the replacement of the punch head after the punch head of the punch rod is worn.

[0005] The present application provides a hydraulic press punch rod, comprising a punch rod, a punch head and a pin shaft arranged in a vertical direction, a protrusion being provided at the lower end of the punch rod, a groove being provided at the upper end of the punch head, a first connecting hole being provided on the protrusion, and a second connecting hole being provided on the groove, when the protruding end of the punch rod is inserted into the first groove of the punch head, the first connecting hole and the second connecting hole can be connected to each other, and after the pin shaft is inserted into the connected first connecting hole and the second connecting hole, the punch rod and the punch head can be detachably connected together.

[0006] Furthermore, both sides of the end portion of the protrusion are chamfered.

[0007] Furthermore, the first groove has an outwardly expanded structure at one end thereof close to the punch rod.

[0008] Furthermore, the protrusion is interference fit with the first groove.

[0009] Furthermore, the pin shaft is interference fit with the first connecting hole and the second connecting hole.

[0010] Furthermore, after the pin shaft is inserted into the first connecting hole and the second connecting hole, the pin shaft can be sealed in the first connecting hole and the second connecting hole by a plug.

[0011] Furthermore, a plurality of second grooves are provided on the outer peripheral surface of the pin shaft at intervals along the axial direction thereof, and the cross section of the second groove is fan-shaped.

[0012] Furthermore, the sector angle of the second groove is 60-70°.

[0013] Furthermore, the diameter of one end of the pin shaft is smaller than the diameter of the entire shaft body.

[0014] Furthermore, a plug is included, and the plug is used to seal the pin shaft in the first connecting hole and the second connecting hole.

[0015] Compared with the prior art, the beneficial effects of this application are embodied in:

[0016] The punch rod body of the hydraulic press is configured as two detachable parts, the punch rod and the punch head, and the two parts (the punch rod and the punch head) are connected by a pin. When the punch head is worn to the point where it no longer meets the requirements for use, it is necessary to replace the punch head. When replacing the punch head, there is no need to remove the entire punch rod from the hydraulic press for replacement. Instead, the pin is directly removed from the connection between the punch rod and the punch head and replaced with a new one. This will make maintenance and replacement operations convenient, safe and reliable, improve maintenance efficiency, increase equipment operation rate, save material and spare parts costs, and increase production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of this application;

[0019] Figure 2 Schematic diagram of the structure of the punch rod and punch head in this application;

[0020] Figure 3 This is a schematic diagram of the structure of the pin in this application;

[0021] Figure 4 for Figure 4 AA cross-sectional structural diagram in;

[0022] Figure 5 This is a schematic diagram of the structure of the plug in this application;

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1: punch; 2: punch head; 3: pin shaft; 4: protrusion; 5: first connecting hole; 6: first groove; 7: second connecting hole; 8: second groove; 9: plug. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0026] Referring to Figure 1-Figure 5 The hydraulic machine punch provided by the present application comprises a punch 1, a punch head 2 and a pin shaft 3 arranged in a vertical direction. The lower end of the punch 1 is provided with a protrusion 4. The upper end of the punch head 2 is provided with a first groove 6. The protrusion 4 is provided with a first connecting hole 5. The first groove 6 is provided with a second connecting hole 7. When the protrusion 4 of the punch 1 is inserted into the first groove 6 of the punch head 2, the first connecting hole 5 and the second connecting hole 7 can be mutually penetrated. The pin shaft 3 is inserted into the first connecting hole 5 and the second connecting hole 7 after penetration, so as to detachably connect the punch 1 and the punch head 2 together.

[0027] The present application is to set the integrated punch into two detachable parts, i.e. the punch 1 and the punch head 2, and connect the two parts (the punch 1 and the punch head 2) by the pin shaft 3. When the punch head 2 is worn to the extent that it does not meet the use conditions, the punch head 2 needs to be replaced. When the punch head 2 is replaced, the punch 1 does not need to be detached from the hydraulic machine as a whole for replacement, but the pin shaft 3 is taken out at the connection between the punch 1 and the punch head 2, and a new punch head 2 is replaced. This makes the operation convenient, safe and reliable during maintenance and replacement, improves the maintenance efficiency, improves the equipment operation rate, saves the cost of material spare parts, and improves the production capacity. Compared with the threaded connection mode, by cooperating the pin shaft 3 with the first connecting hole 5 and the second connecting hole 7, the problem that the thread is deformed due to heat during threaded connection, so that the connection between the punch 1 and the punch head 2 is loose, can be avoided. The problem that the punch head 2 is difficult to take off from the thread when the punch head 2 is replaced due to thread deformation can also be avoided.

[0028] The depth of the first groove 6 does not penetrate the punch head 2. The depth of the first groove 6 and the height ratio of the punch head 2 ensure that the lower end of the punch head 2 can normally extrude the material. Specifically, the depth of the first groove 6 and the height ratio of the punch head 2 can be 3:5. For example, the depth of the first groove 6 is 120 mm, and the height of the punch head 2 is 200 mm.

[0029] Further, see Figure 2 The ends of the protrusion 4 are chamfered on both sides.

[0030] In one possible implementation, both sides of the end of the protrusion 4 are chamfered, which can reduce the impact of uneven or protruding parts on the parts during the connection process, avoid the protrusion 4 from getting stuck or stuck when inserted into the first groove 6, improve the connection efficiency, and also reduce the friction between the protrusion 4 and the first groove 6, reduce the wear of the protrusion 4 and the first groove 6, and thus extend the service life of the protrusion 4 and the first groove 6.

[0031] Further, see Figure 2 The first groove 6 has an outward expansion structure at one end thereof close to the punch rod 1 .

[0032] In a possible implementation, the first groove 6 of the punch 2 has an outwardly expanded structure near one end of the punch rod 1 , which can reduce the resistance of the protrusion 4 when inserted into the first groove 6 .

[0033] Furthermore, the protrusion 4 and the first groove 6 are interference fit.

[0034] In one possible implementation, the interference fit is achieved by thermal expansion and contraction, with the diameter of the protrusion 4 being slightly larger than the diameter of the first groove 6. Specifically, the diameter of the protrusion 4 is 0.03 to 0.05 mm larger than the diameter of the first groove 6. During assembly, the protrusion 4 is cooled, shrinking and reducing its diameter. The protrusion 4 is then inserted into the first groove 6. After returning to room temperature, the protrusion 4 returns to its original size. Since the diameter of the protrusion 4 is larger than that of the first groove 6, the protrusion 4 is stably connected to the first groove 6.

[0035] In actual production, the diameter of the protrusion 4 may preferably be 135+0.05-0.07 mm, and the diameter of the first groove 6 may preferably be 135-0-0.04 mm.

[0036] The thermal expansion and contraction method is adopted because the protrusion 4 and the first groove 6 are vertically connected. For the punch rod 1, the movable beam connected above the punch rod 1 is difficult to knock. For the first groove 6, the lower end surface of the first groove 6, that is, the lower end surface of the punch 2 is used to press the material, and it is not convenient to use the knocking method to avoid damaging the surface of the punch 2. Therefore, the thermal expansion and contraction connection method is adopted.

[0037] Specifically, the punch rod 1 is made of 42CrMo and the punch head 2 is made of HMAX-3, so as to increase the stability of the metal and improve the wear resistance of the punch head 2.

[0038] Furthermore, the pin 3 is interference fit with the first connecting hole 5 and the second connecting hole 7 .

[0039] In a possible implementation, the pin shaft 3 can stably connect the punch rod 1 and the punch head 2, so that the punch head 2 does not separate from the punch rod 1 during use, causing harm to the workers and affecting the construction period.

[0040] The diameter of the pin shaft 3 is slightly larger than the diameter of the first connecting hole 5 and the second connecting hole 7. The diameter of the shaft body of the pin shaft 3 can be preferably 30+0.08-0.12 mm, the diameter of the end part can be preferably 29 mm, and the diameter of the hole can be preferably 30-0.05-0.08 mm.

[0041] Further, referring to Figure 1 , Figure 4 and Figure 5 , the plug 9 is used to plug the pin shaft 3 in the first connecting hole 5 and the second connecting hole 7.

[0042] In a possible implementation, after the pin shaft 3 is inserted in the first connecting hole 5 and the second connecting hole 7, the two ends of the pin shaft 3 are arc-shaped surfaces, and the additional two plugs 9 are used to plug the two ends of the pin shaft 3 in the first connecting hole 5 and the second connecting hole 7, so as to ensure the firmness of the connection between the pin shaft 3 and the first connecting hole 5 and the second connecting hole 7, and to protect the two end surfaces of the pin shaft 3, so as to avoid rusting of the two exposed ends of the pin shaft 3 due to oxidation by air during long-term use.

[0043] Further, referring to Figure 3-Figure 4 , the second groove 8 is provided on the outer circumferential surface of the pin shaft 3 and spaced apart along the axial direction of the pin shaft 3, and the cross section of the second groove 8 is fan-shaped.

[0044] In a possible implementation, when the protrusion 4 of the punch rod 1 is inserted into the first groove 6 of the punch head 2, the first connecting hole 5 and the second connecting hole 7 are mutually penetrated, and then the pin shaft 3 is inserted in the first connecting hole 5 and the second connecting hole 7 after penetration. Since the diameter of the pin shaft 3 is slightly larger than the diameter of the first connecting hole 5 and the second connecting hole 7, a technician needs to knock the pin shaft 3 into the first connecting hole 5 and the second connecting hole 7 after penetration by means of an additional tool. The pin shaft 3 moves towards the first connecting hole 5 and the second connecting hole 7 after penetration. At this time, the entire outer circumference of the pin shaft 3 is in a state of compression, and the second groove 8 on the surface of the pin shaft 3 tends to contract inward, which helps the pin shaft 3 to be inserted into the first connecting hole 5 and the second connecting hole 7 after penetration. Since the cross section of the second groove 8 is fan-shaped, the fan-shaped angles can be shrunk together without leaving a gap after contraction, so as to ensure the firmness of the work of the pin 3. Since the diameter of the pin shaft 3 itself is slightly larger than the diameter of the first connecting hole 5 and the second connecting hole 7, even if the second groove 8 is contracted, it does not affect the stability of the pin shaft 3 in the first connecting hole 5 and the second connecting hole 7, that is, the punch rod 1 and the punch head 2 can be stably connected by means of the pin shaft 3.

[0045] Among them, three groups of second grooves 8 can be provided, and the three groups of second grooves 8 are evenly opened on the outer peripheral surface of the pin shaft 3. When setting the second grooves 8, avoid excessive number of second grooves 8. The shrinkage of multiple second grooves 8 will seriously reduce the diameter of the pin shaft 3. After long-term use, the pin shaft 3 will fall off from the first connecting hole 5 and the second connecting hole 7.

[0046] Furthermore, the sector angle of the second groove 8 is 60-70°.

[0047] In one possible implementation method, based on the actual R&D experience of R&D personnel, the optimal angle of the second groove is 67°, which ensures that the pin shaft 3 can be inserted into the first connecting hole 5 and the second connecting hole 7, and can also ensure the tightness of the pin shaft 3 in the first connecting hole 5 and the second connecting hole.

[0048] Further, see Figure 3 The diameter of one end of the pin 3 is smaller than the diameter of the entire shaft body.

[0049] In one possible implementation, one end of the pin 3 has a smaller diameter. This allows the smaller diameter end of the pin 3 to be inserted first when inserting the pin 3 into the first connection hole 5 and the second connection hole 7, thereby guiding the path of the pin 3 in the first connection hole 5 and the second connection hole 7. When the pin 3 needs to be replaced, it is removed from the end with the larger diameter, that is, from the end that is not retracted inward.

[0050] The actual application process of the hydraulic press punch rod of the present application is: cool the end of the punch rod 1 with the protrusion 4, insert the cooled protrusion 4 into the first groove 6, and when the first connecting hole 5 on the protrusion 4 and the second connecting hole 7 on the groove are interconnected, use additional tools to insert the pin shaft 3 into the first connecting hole 5 and the second connecting hole 7, use the plug 9 to seal the two ends of the pin shaft 3 in the first connecting hole 5 and the second connecting hole 7, complete the connection between the punch rod 1 and the punch 2, and then the punch rod 1 can be used. When the punch 2 needs to be replaced, the staff uses additional tools to knock out the pin shaft 3 in the first connecting hole 5 and the second connecting hole 7 and replace the new punch 2.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic press punch, characterized in that: The invention comprises a punch rod (1), a punch head (2) and a pin shaft (3) arranged in a vertical direction, wherein the lower end of the punch rod (1) is provided with a protrusion (4), the upper end of the punch head (2) is provided with a first groove (6), the protrusion (4) is provided with a first connecting hole (5), and the first groove (6) is provided with a second connecting hole (7); When the protrusion (4) end of the punch rod (1) is inserted into the first groove (6) of the punch head (2), the first connecting hole (5) and the second connecting hole (7) can be connected to each other; After the pin shaft (3) is inserted into the first connecting hole (5) and the second connecting hole (7) that are connected through, the punch rod (1) and the punch head (2) can be detachably connected together.

2. The hydraulic press punch according to claim 1, characterized in that: The end of the protrusion (4) is in a chamfered structure.

3. The hydraulic press punch according to claim 1, characterized in that: The first groove (6) has an outwardly expanded structure at one end thereof close to the punch rod (1).

4. The hydraulic press punch according to claim 1, characterized in that: The protrusion (4) and the first groove (6) are interference fit.

5. The hydraulic press punch according to claim 1, characterized in that: The pin shaft (3) is interference-fitted with the first connecting hole (5) and the second connecting hole (7).

6. The hydraulic press punch according to claim 1, characterized in that: A plurality of second grooves (8) are provided on the outer peripheral surface of the pin shaft (3) at intervals along the axial direction thereof, and the cross section of the second grooves (8) is fan-shaped.

7. The hydraulic press punch according to claim 6, characterized in that: The sector angle of the second groove (8) is 60-70°.

8. The hydraulic press punch according to any one of claims 1 to 7, characterized in that: The diameter of one end of the pin shaft (3) is smaller than the diameter of the entire shaft body.

9. The hydraulic press punch according to any one of claims 1 to 7, characterized in that: It also includes a plug (9), which is used to seal the pin shaft (3) in the first connecting hole (5) and the second connecting hole (7).

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