Hot forging die for sleeve forging forming of two parts

Abstract

The utility model discloses a hot forging die for forging two parts, which relates to the technical field of forging dies and is used for solving the problems of forging die thermal mechanical damage and poorer utilization effect of excess materials of forgings caused by demolding damping of the forgings. According to the utility model, the supporting auxiliary die sleeve, the lower die base body and the lower die piece are mainly arranged, so that the total amount of contact heat enrichment of the forging die is reduced, and the thermal mechanical damage of demolding damping generated by forging to the forging die is reduced. By arranging the first separation piston rod, the lower core die, the separation cavity and the lower die piece, the bearing pressure of the forge piece can be discretely distributed, the utilization input cost of excess materials of the forge piece is reduced, and the possibility of thermal mechanical damage of the forging die is reduced. By arranging the lower core die, the lower die piece and the wad die sleeve, the forging quality and the machining manufacturability of forging forming are improved, and the thermal contact temperature peak value of the forging die is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of forging dies, in particular to a hot forging die for sleeve forging of two parts. Background Art

[0002] During the trimming and punching process, one forging is trimmed and another forging is punched at the same time in one stroke of the press. Ring parts cannot be forged with through holes during open die forging. A certain thickness of punching skin should be retained in the inner hole of the die forging. If the punching skin is not designed properly, it will lead to poor forging processability, large difficult deformation area, poor metal fluidity, many forging defects, and low service life of the forging die. For gear blank forgings with spokes and rims, pre-forging is generally required during die forging, so that the blank metal can be reasonably distributed in the final forging die cavity and is conducive to filling the die cavity. If the outer diameter of the preformed gear blank is small, it is difficult to fill the gear rim according to the metal flow analysis. If the outer diameter of the blank is large, it is difficult to fill the high hub part.

[0003] In the prior art, the material utilization effect at the center position of forgings such as discs, sleeves or rings is poor. A common utilization treatment method is to use the skin at the center position of the forging as the second part for synchronous forging. However, the forging die of the existing sleeve forging process usually has a large thermal contact area with the forging, and the temperature of the forging is easily concentrated on the surface of the forging die to cause damage, aggravating the damage of the forging die and reducing its service life. In addition, in the forging process in which the circumferential side and the center position of the forging are synchronously formed into two parts, the mold shape is more complicated and more materials are used. Under the damage caused by thermal contact with the forging, the investment cost is relatively high, and it is difficult to effectively utilize the skin at the middle position of the forging as forging material to form a new part for waste material utilization.

[0004] In the prior art, for example, Japanese invention patent JP7105125B2 discloses a forming die. In the technical solution of the invention, an inclination angle is set between the limiting side forming cavity and the forging forming low cavity, so that the inlet and outlet diameters of the forging forming space are different, thereby reducing the situation where the release agent falls off and is wiped off during the forging forming process, which makes it difficult for the forging to fall off in time; in this invention patent, there may be adhesion or extrusion on the forging forming contact surface, resulting in difficulty in demolding. The contact surface between the forging die and the forging is relatively fixed, and the thermal damage to the forging die surface may be accelerated under thermal contact, resulting in failure of the forging die, which is not conducive to high-strength and high-frequency use of the die. There may be a situation where the material utilization rate of the forging center is low, and the dependence on the release agent is high, thereby reducing the forging efficiency.

[0005] For example, Japanese invention patent JP6588312B2 discloses a hole forging device and method. In the technical solution of this invention patent, a group of relatively arranged punching shafts are used to impact the forging in both directions, and cooperate to discharge the punched out excess material with demolding; compared with the forging die, the punching structure of this invention patent has more restrictions on the punching position, and the thermal contact area with the forging is relatively large. There may be problems such as the modified excess material punch and the excess material punching efficiency is low, the contact heat conductivity of the punching structure is high, the contact time between the die and the forging is long, the forging die is more susceptible to thermal contact damage, the cost is high, and the efficiency is low. Utility Model Content

[0006] The utility model aims to provide a hot forging die for forging two parts in a nested manner, so as to solve the problems of thermal mechanical damage to the forging die caused by demoulding damping of forgings and poor utilization of forging surplus materials.

[0007] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0008] A hot forging die for forging two parts, comprising a lateral accommodating box, a supporting auxiliary die sleeve fixedly connected inside the lateral accommodating box, an upper die piece provided at the upper end of the lateral accommodating box, an upper die base fixedly connected to the upper end of the upper die piece, a lower die base slidably connected to one end in the supporting direction inside the lateral accommodating box, and a lower die piece fixedly connected to the end face of the lower die base in the thermal contact direction.

[0009] Preferably, a split cavity is provided at one end of the upper mold in the heat contact direction, a core mold piston rod is fixedly connected to the lower end of the upper mold base, and the end of the core mold piston rod facing the heat contact direction is dynamically connected to the upper core mold, and the upper core mold is located in the split cavity.

[0010] Preferably, a gap is left between the upper core mold and the upper mold piece in the radial direction.

[0011] Preferably, a disengagement cavity is provided at the thermal contact end of the lower mold base, a lower core mold is provided at one end of the disengagement cavity in the thermal contact direction, a first disengagement piston rod is fixedly connected to the other end of the disengagement cavity, and the upper end of the first disengagement piston rod is dynamically connected to the lower core mold.

[0012] Preferably, a skin-connected mold sleeve is provided at one end of the separation cavity in the heat contact direction, and the skin-connected mold sleeve is located between the lower core mold and the lower mold piece.

[0013] Preferably, a gap is left between the lower core mold and the skin mold sleeve in the radial direction.

[0014] Preferably, one end of the disengagement chamber in thermal contact is slidably connected to a continuous skin support seat, and the other end of the disengagement chamber is fixedly connected to a second disengagement piston rod, and the second disengagement piston rod is dynamically connected to the continuous skin support seat.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] By setting the supporting auxiliary die sleeve, the lower die base and the lower die piece, the forging support contact area of ​​the lower die piece to the forging base is reduced, the proportion of die thermal load is reduced, the total amount of heat enrichment of the forging die contact is reduced, the demoulding damping generated by forging to the forging die is reduced, and the thermal mechanical damage to the forging die is improved. The service life of the forging die and the convenience of maintenance are improved;

[0017] By setting the upper core die, upper die piece and core die piston rod, the material utilization rate of forgings is improved, the matching accuracy between the die and forgings in each forging area is improved, the forging processing accuracy is improved, and the effective forging power of the press is increased;

[0018] By arranging the first disengagement piston rod, the lower core die, the disengagement cavity and the lower die, the forging support pressure can be distributed discretely, the forging surplus material utilization investment cost can be reduced, and the possibility of thermal mechanical damage to the forging die can be reduced;

[0019] By setting the lower core die, the lower die piece and the skin die sleeve, the quality of the forgings and the processing technology of the forging are improved, the peak value of the thermal contact temperature of the forging die is reduced, and the service life of the forging die is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of a hot forging die for forming two parts by nesting forging in the utility model;

[0022] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0023] Figure 3 Schematic diagram of the internal structure of the lower mold base;

[0024] Figure 4 It is a schematic diagram of the internal structure of the upper module;

[0025] Figure 5 yes Figure 3 Schematic diagram of the assembly relationship between the middle and lower mold parts and the lower core mold;

[0026] Figure 6 yes Figure 3 A local enlarged schematic diagram of point B in the middle.

[0027] Figure numbers: supporting auxiliary die sleeve 11; lower die base 12; lower die member 13; upper die base 14; upper die member 15; forging base 16; residual material block 17; disengagement cavity 20; first disengagement piston rod 21; second disengagement piston rod 22; skin-connected support seat 23; lower core die 24; skin-connected die sleeve 25; split cavity 30; core die piston rod 31; upper core die 32; heat dissipation groove 33; heat dissipation channel 34. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] Embodiment 1

[0031] See attached Figure 1 As shown, the utility model provides a hot forging die for forming two parts by sleeve forging, including a lateral accommodating box 10, a supporting auxiliary die sleeve 11 is fixedly connected in the lateral accommodating box 10, a forging base 16 is arranged in the lateral accommodating box 10, the supporting auxiliary die sleeve 11 can be supported at the outer edge end of the forging base 16, the lateral accommodating box 10 and the supporting auxiliary die sleeve 11 cooperate with each other to accommodate the forging base 16, an upper die 15 is arranged at the upper end of the lateral accommodating box 10, an upper die base 14 is fixedly connected at the upper end of the upper die 15, a lower die base 12 is slidably connected at one end of the supporting direction in the lateral accommodating box 10, the lower die base 12 is located in the supporting auxiliary die sleeve 11, and a lower die 13 is fixedly connected to the end face of the lower die base 12 in the thermal contact direction;

[0032] A lower die 13 that matches the spokes of the lower die 13 is installed on the upper end surface of the lower die base 12. The lower die 13 cooperates with the supporting auxiliary die sleeve 11 to jointly support the forging base 16. When the press drives the upper die base 14 to rise and fall, the upper die 15 installed at the lower end of the upper die base 14 cooperates with the support of the lower die 13 and the supporting auxiliary die sleeve 11 to forge the forging base 16. The lateral receiving box 10 is installed at the fixed end of the press and its position is fixed. The upper die base 14 is installed at the movable end of the press. The lower die base 12 is driven to rise and fall by a power device in the lateral receiving box 10, thereby driving the lower die 13 to rise and fall to a horizontal height, and the forging is completed in cooperation.

[0033] The lower die member 13 is arranged on the lower die base 12 to improve the disassembly and maintenance efficiency. At the same time, the lower die base 12 and the lower die member 13 can be raised and lowered relative to the lateral accommodation box 10 and the supporting auxiliary die sleeve 11 to adjust the position, so that the lower die base 12 can be driven down in the lateral accommodation box 10 during non-forging time to separate the lower die member 13 from the forging base 16, which can better overcome the separation damping between the forging base 16 and the lower die member 13 generated by the forging of the forging base 16;

[0034] By providing the supporting auxiliary die sleeve 11, the lower die base 12 and the lower die member 13, the forging supporting contact area of ​​the lower die member 13 to the forging base 16 is reduced, the mold thermal load ratio is reduced, the total amount of heat enrichment in the forging die contact is reduced, the demolding damping generated by forging is reduced to reduce the thermal mechanical damage to the forging die, and the service life of the forging die and the convenience of maintenance are improved.

[0035] See attached Figure 1 and attached Figure 4 As shown, a split cavity 30 is provided at one end of the upper mold 15 in the heat contact direction, a core mold piston rod 31 is fixedly connected to the lower end of the upper mold base 14, and an upper core mold 32 is dynamically connected to one end of the core mold piston rod 31 in the heat contact direction, and the upper core mold 32 is located in the split cavity 30;

[0036] A groove is provided in the upper die base 14 to fix the core die piston rod 31. The upper die base 14 drives and controls the extension and contraction of the core die piston rod 31 by laying a power pipeline, and the die in contact with the upper surface of the forging base 16 for forging is divided into two parts: the upper die 15 and the upper core die 32. The residual material block 17 can be obtained from the forging base 16 by forging, and the center material of the forging such as the wheel disk is used as the forging blank of the second part. With the cooperation of the upper core die 32 and the upper die 15, two forgings, the outer edge part of the forging base 16 and the residual material block 17, can be obtained in one forging process.

[0037] In addition, in the process of driving the core mold piston rod 31 to extend and retract, the upper core mold 32 can also be driven to move up and down to adjust the position. The longitudinal height of the upper core mold 32 and the upper mold piece 15 is directly adjustable, so that the cooperation mode between the upper core mold 32 and the upper mold piece 15 can be conveniently switched for forging. At the same time, the upper core mold 32 can be conveniently removed at the lower end of the core mold piston rod 31 and replaced with a punching and cutting piece to punch out the excess material block 17. At the same time, the forging base 16 and the upper mold piece 15 can also be demoulded by the separation damping.

[0038] By providing the upper core die 32, the upper die member 15 and the core die piston rod 31, the material utilization rate of the forging is improved, the matching accuracy between the die and the forging in each area of ​​the sleeve forging is improved, the sleeve forging processing accuracy is improved, the effective forging power of the press is improved, the die cavity for utilizing the residual material is avoided on the integral die, and the cost of the sleeve forging die is reduced.

[0039] See attached Figure 1 and attached Figure 4 As shown, a gap is left between the upper core mold 32 and the upper mold member 15 in the radial direction;

[0040] The gap between the upper core die 32 and the upper die 15 can accommodate a portion of the metal flow within the forging skin range between the forging base 16 and the residual material block 17, which can reduce the formation of the difficult deformation area within the forging skin range and prevent the machining interference caused by switching between the two working areas of the sleeve forging in different working states;

[0041] The quality of sleeve forging is improved, the possibility of sleeve forging interference is reduced, the temperature transfer between sleeve forging dies is isolated, the temperature interference of residual material forging is reduced, the service life of the forging die for residual material utilization is increased, and the processing stability of residual material utilization of forgings is improved.

[0042] See attached Figure 1 To Attachment Figure 3 As shown, a disengagement cavity 20 is provided at the heat contact end of the lower mold base 12, a lower core mold 24 is provided at one end of the disengagement cavity 20 in the heat contact direction, a first disengagement piston rod 21 is fixedly connected to the other end of the disengagement cavity 20, and the upper end of the first disengagement piston rod 21 is dynamically connected to the lower core mold 24;

[0043] The first disengagement piston rod 21 can drive the lower core mold 24 to rise and fall in the disengagement chamber 20, so as to adjust the relative position height between the lower core mold 24 and the lower mold member 13. When the forging base 16 and the residual material block 17 are sleeved and forged, the first disengagement piston rod 21 drives the lower core mold 24 to descend, which can release the space in the disengagement chamber 20, so as to facilitate the flushing of the residual material block 17. When the first disengagement piston rod 21 drives the lower core mold 24 to rise, the flushed residual material block 17 can be driven to be discharged from the forging base 16, and the lower mold base 12 can slide in the lateral accommodation box 10, so as to timely separate the lower core mold 24 and the lower mold member 13 from the thermal contact between the upper mold member 15 and the residual material block 17.

[0044] At the same time, the extension and retraction of the first disengagement piston rod 21 can also cooperate with the extension of the core mold piston rod 31 to drive the punch or cutting piece clamped at its lower end to stably clamp the remaining material block 17 and then discharge the material;

[0045] By providing the first disengagement piston rod 21, the lower core die 24, the disengagement cavity 20 and the lower die 13, the forging support pressure can be discretely distributed on the lower core die 24 and the lower die 13, thereby reducing the thermal contact area of ​​the forging molding, improving the molding quality of the sleeve forging partition, improving the utilization effect of the forging surplus material, enabling timely discharge of the material, improving the automation control effect of the sleeve forging discharge, reducing the investment cost of the forging surplus material utilization, improving the reliability of forging discharge, reducing the non-processing contact time between the mold and the forging, and reducing the possibility of thermal mechanical damage to the forging die.

[0046] See attached Figure 1 To Attachment Figure 3 And attached Figure 5 As shown, a leather mold sleeve 25 is provided at one end of the separation cavity 20 in the heat contact direction, and the leather mold sleeve 25 is located between the lower core mold 24 and the lower mold member 13;

[0047] The skin-jointed die sleeve 25 whose upper end surface cooperates with the lower die 13 is provided to forge and support the edge of the forging base 16, so as to ensure the continuity of the forging quality of the forging base 16; at the same time, the influence of the residual material processing residual material block 17 on the quality of the forging base 16 obtained by forging is reduced, so as to facilitate the design of skin-jointed processing between the forging base 16 and the residual material block 17;

[0048] By providing the lower core die 24, the lower die 13 and the leather die sleeve 25, the quality of the forging and the processing technology of the forging are improved. The leather die sleeve 25 can separate a part of the heat conducted to the lower die 13 from the forging matrix 16, reduce the peak value of the thermal contact temperature of the forging die, and increase the service life of the forging die.

[0049] See attached Figure 3 As shown, a gap is left between the lower core mold 24 and the skin mold sleeve 25 in the radial direction;

[0050] The gap between the lower core mold 24 and the skin-connecting mold sleeve 25 can isolate the temperature conduction between the lower mold 13 and the lower core mold 24, can accommodate a part of the metal flow within the skin-connecting range, reduce the formation of the hard-to-deform area of ​​the forging, and reduce the load of the press;

[0051] The heat dissipation effect of the forging die base is improved and the load on the press is reduced.

[0052] See attached Figure 1 and attached Figure 3 As shown, one end of the disengagement chamber 20 in thermal contact is slidably connected to a skin-connected support seat 23, and the other end of the disengagement chamber 20 is fixedly connected to a second disengagement piston rod 22, and the second disengagement piston rod 22 is dynamically connected to the skin-connected support seat 23;

[0053] When the skin-jointed die sleeve 25 is arranged in a sliding manner in the disengagement chamber 20, the second disengagement piston rod 22 drives the skin-jointed support seat 23 to move up and down, which can drive the adjustment of the height of the skin-jointed die sleeve 25, and can facilitate the control of the forging accommodation of different skin-jointed thicknesses, and at the same time assist the lower die 13 to support the forging base 16 for forging, thereby expanding the supporting area of ​​the forging base 16;

[0054] By providing the second disengaging piston rod 22, the continuous skin support seat 23 and the continuous skin die sleeve 25, the design control effect of the forging continuous skin is improved and the size range of the forging is increased.

[0055] Embodiment 2

[0056] See attached Figure 6 As shown, a heat dissipation groove 33 is provided on the end surface of the lower mold base 12 in the heat contact direction, and a heat dissipation channel 34 is provided in the lower mold base 12. The heat dissipation groove 33 and the heat dissipation channel 34 are interconnected, and the lower mold 13 can flow with a cooling fluid, and the heat dissipation fluid flows into the heat dissipation groove 33 to dissipate the heat at the lower end of the lower mold 13;

[0057] It can improve the active heat dissipation effect and convenience of the forging die during the forging process, improve the transfer of heat enriched in the thermal contact layer in the thermal fluctuation zone of the forging die, and increase the service life of the die cavity.

[0058] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or replace them with other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

[0059] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A hot forging die for forming two parts by nesting forging, comprising a lateral accommodating box (10), a supporting auxiliary die sleeve (11) being fixedly connected inside the lateral accommodating box (10), an upper die member (15) being provided at the upper end of the lateral accommodating box (10), an upper die base (14) being fixedly connected at the upper end of the upper die member (15), characterized in that: One end of the lateral containing box (10) in the supporting direction is slidably connected to a lower mold base (12), and an end surface of the lower mold base (12) in the thermal contact direction is fixedly connected to a lower mold component (13).

2. A hot forging die for two-part nesting forging according to claim 1, characterized in that: A split cavity (30) is provided at one end of the upper mold member (15) in the heat contact direction, a core mold piston rod (31) is fixedly connected to the lower end of the upper mold base (14), and an upper core mold (32) is dynamically connected to one end of the core mold piston rod (31) in the heat contact direction, and the upper core mold (32) is located in the split cavity (30).

3. A hot forging die for two-part nesting forging according to claim 2, characterized in that: A gap is left between the upper core mold (32) and the upper mold piece (15) in the radial direction.

4. A hot forging die for two-part nesting forging according to any one of claims 1 to 3, characterized in that: A disengagement cavity (20) is provided at the thermal contact end of the lower mold base (12); a lower core mold (24) is provided at one end of the disengagement cavity (20) in the thermal contact direction; a first disengagement piston rod (21) is fixedly connected to the other end of the disengagement cavity (20); and the upper end of the first disengagement piston rod (21) is dynamically connected to the lower core mold (24).

5. A hot forging die for two-part nesting forging according to claim 4, characterized in that: A skin-connected mold sleeve (25) is provided at one end of the separation cavity (20) in the heat contact direction, and the skin-connected mold sleeve (25) is located between the lower core mold (24) and the lower mold component (13).

6. A hot forging die for two-part nesting forging according to claim 5, characterized in that: A gap is left between the lower core mold (24) and the skin mold sleeve (25) in the radial direction.

7. A hot forging die for two-part nesting forging according to claim 6, characterized in that: One end of the disengagement chamber (20) in thermal contact is slidably connected to a skin-connected support seat (23), and the other end of the disengagement chamber (20) is fixedly connected to a second disengagement piston rod (22), and the second disengagement piston rod (22) is dynamically connected to the skin-connected support seat (23).

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