A large tie rod forging device and forming method thereof

Abstract

The present invention provides a large tie rod forging forming device and a forming method thereof. The forming device comprises a rigid frame, a hydraulic cylinder, an extrusion punch, a die sleeve, a movable half die, a fixed half die and a limit plate. The hydraulic cylinder is fixed at one end of a processing groove of the rigid frame, and its piston rod is fixedly connected to the extrusion punch. The die sleeve is slidably fitted on the outside of the extrusion punch, and a compression spring is also sleeved on the outside of the extrusion punch. A fixed frame is also provided in the processing groove, one end of the fixed half die is fixed on the fixed frame, the movable half die is combined on the upper side of the fixed half die, the fixed half die and the movable half die are arranged relative to each other and form a pre-forged blank head mold cavity, and an engaging cavity is also provided in the die sleeve that can be engaged with the outside of the movable half die and the fixed half die under the thrust of the compression spring. The present invention makes it possible to extrude a pre-forged blank for a bar material, so that an extra-long tie rod can be forged as a whole, and the tie rod forged by the pre-forged blank obtained by this method does not require welding and has higher tensile strength.

Description

Technical Field

[0001] The invention relates to forging of a large draw rod, in particular to a forging device and a forming method of a large draw rod. Background Art

[0002] In the forging of large tie rods, the traditional forging method is generally to forge the tie rod head and the tie rod part separately, and then weld the two forged parts together by welding. However, the welded structure has weaker tensile strength than the one-piece structure.

[0003] Therefore, there is an urgent need for a large tie rod forging forming device and a forming method thereof which has a simple structure, is convenient to form, can realize the integral forging of an ultra-long tie rod, and improves the tensile strength of the formed part. Summary of the invention

[0004] The purpose of the present invention is to provide a large tie rod forging forming device and a forming method thereof, so that pre-forged billets can be extruded for bars of different lengths, so that extra-long tie rods can be forged as a whole, and the tie rods forged from the pre-forged billets obtained by this method do not require welding and have higher tensile strength.

[0005] The present invention provides the following technical solutions:

[0006] A large tie rod forging forming device and a forming method thereof, comprising a rigid frame, a hydraulic cylinder, an extrusion punch, a die sleeve, a movable half die, a fixed half die and a limit plate, wherein the rigid frame is provided with a processing groove, the hydraulic cylinder is fixed at one end of the processing groove, and its piston rod is fixedly connected to the extrusion punch, a retaining ring is provided at one end of the extrusion punch facing the hydraulic cylinder, the die sleeve is slidably fitted on the outside of the extrusion punch, and a compression spring is also abutted between the die sleeve and the retaining ring; a fixing frame is also provided in the processing groove, one end of the fixed half die is fixed on the fixing frame, and its The opening of the half-mold cavity is upward, and the movable half mold is covered and arranged on the upper side of the fixed half mold. The fixed half mold and the movable half mold are arranged opposite to each other and form a pre-forged billet head mold cavity. The extrusion punch extends into the pre-forged billet head mold cavity from one end to extrude and upset one end of the rod placed in the pre-forged billet head mold cavity, and the other end of the rod extends out of the pre-forged billet head mold cavity and the fixed frame to abut against the limit plate limited on the rigid frame; the die sleeve is also provided with an engaging cavity which can be engaged with the outside of the movable half mold and the fixed half mold under the thrust of the compression spring.

[0007] Preferably, at least one set of first sliding blocks are respectively provided on both sides of the mold sleeve, and a sliding groove slidably matched with the sliding block is also provided on the side wall of the processing groove.

[0008] Preferably, the outer sides of the movable half die and the fixed half die are also provided with a first inclined surface inclined toward the center of the preforged billet head cavity, the end of the first inclined surface farther from the center of the preforged billet head cavity extends toward the fixed frame, and the end of the first inclined surface closer to the center of the preforged billet head cavity extends toward the compression spring, and the engaging cavity is also provided with a second inclined surface that can cooperate with the first inclined surface when the movable half die and the fixed half die are engaged.

[0009] Preferably, the fixing frame is further provided with a collision block which can abut against one end of the mold sleeve when the movable half mold and the fixed half mold are embraced.

[0010] Preferably, at least one set of limiting grooves are provided on both sides of the bottom of the processing groove, and the bottom end of the limiting plate is inserted and fixed in the limiting groove.

[0011] Preferably, a protruding block is provided at one end of the half-mold cavity facing the movable half mold and the fixed half mold, a channel that is embraced outside the bar is formed between the two groups of protruding blocks, and an outward-expanding arc surface is provided on the side of the protruding block away from the fixed frame.

[0012] The forming method based on the above-mentioned large tie rod forging forming device comprises the following steps:

[0013] S1: heating one end of the head of the bar to 1150-1200°C;

[0014] S2: placing one end of the head of the heated bar in S1 into the plate mold cavity of the fixed half mold, and the other end of the bar abuts against the limiting plate;

[0015] S3: Covering the movable half mold on the fixed half mold;

[0016] S4: starting the hydraulic cylinder to drive the extrusion punch to extend into the die cavity of the pre-forged billet head, and at the same time, the compression spring presses the die sleeve, so that the movable half die and the fixed half die are fixed together, and the extrusion punch is continuously extended into the die cavity of the pre-forged billet head, so that the extrudable heated bar material is upset in the die cavity of the pre-forged billet head to form a pre-forged billet;

[0017] S5: placing the pre-forged blank formed in S4 in a forming die to forge a finished tie rod forging.

[0018] The beneficial effect of the present invention is that: through the forming device, by placing the bar on the fixed half die, abutting against one end of the limit plate, and after closing the movable half die, starting the hydraulic cylinder can realize the rapid upsetting of the bar head in the pre-forging blank head die cavity, forming a pre-forging blank with an arc-shaped transition between the bar head and the bar body, and because there are multiple limit grooves, when the limit plates are inserted in different limit grooves, it can adapt to the forming of bars of different lengths, and because during the forming process, the movable half die and the fixed half die are clamped by the compression spring elastic compression die sleeve, so that it can not only realize that as the piston rod of the hydraulic cylinder is extended, the die sleeve can always clamp the movable half die and the fixed half die, and at the same time avoid direct rigid collision to damage the hydraulic cylinder body, so the forming device using this method can make it possible to extrude pre-forging blanks of any length for bars, and at the same time realize that extra-long pull rods can be forged as a whole, and the pull rods forged from the pre-forging blanks obtained by this method do not require welding and have higher tensile strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 is a top view of the present invention;

[0021] Figure 2 is a front cross-sectional view of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the finished tie rod forging;

[0023] Markings in the figure: 1. Hydraulic cylinder; 2. Compression spring; 3. Extrusion punch; 4. Die sleeve; 5. Movable half die; 6. Fixed half die; 7. Limit plate; 8. Limit groove; 9. Rigid frame; 10. Pre-forged billet; 11. Bar stock; 12. Finished tie rod forging; 13. Retaining ring; 14. Fixed frame; 15. First sliding block; 16. First inclined surface; 17. Second inclined surface; 18. Impact block; 19. Raised block; 20. Arc surface. DETAILED DESCRIPTION

[0024] Combination Figures 1 to 3A large tie rod forging device shown in the figure, in this embodiment, includes a rigid frame 9, a hydraulic cylinder 1, an extrusion punch 3, a die sleeve 4, a movable half die 5, a fixed half die 6 and a limit plate 7, a processing groove is provided on the rigid frame 9, the hydraulic cylinder 1 is fixed at one end of the processing groove, and its piston rod is fixedly connected to the extrusion punch 3, a retaining ring 13 is provided at the end of the extrusion punch 3 facing the hydraulic cylinder 1, the die sleeve 4 is slidably fitted on the outside of the extrusion punch 3, and a compression spring 2 is also abutted between the die sleeve 4 and the retaining ring 13; a fixing frame 14 is also provided in the processing groove, and one end of the fixed half die 6 is fixed to the fixing frame 1 4, and its half-mold opening faces upward, and the movable half mold 5 is covered and configured on the upper side of the fixed half mold 6, the fixed half mold 6 and the movable half mold 5 are arranged opposite to each other and form a preforging billet 10 head mold cavity, the extrusion punch 3 extends from one end of the preforging billet 10 head mold cavity, extrude and upset one end of the rod 11 placed in the preforging billet 10 head mold cavity, and the other end of the rod 11 extends out of the preforging billet 10 head mold cavity and the fixed frame 14 and abuts against the limiting plate 7 limited on the rigid frame 9; the die sleeve 4 is also provided with an engaging cavity that can be engaged with the movable half mold 5 and the fixed half mold 6 outside under the thrust of the compression spring 2.

[0025] At least one set of first sliding blocks 15 is respectively provided on both sides of the mold sleeve 4 , and a sliding groove slidably matched with the sliding blocks is also provided on the side wall of the processing groove, thereby improving the sliding stability of the mold sleeve 4 .

[0026] The outer sides of the movable half die 5 and the fixed half die 6 are also provided with a first inclined surface 16 inclined toward the center of the head cavity of the pre-forged billet 10. The end of the first inclined surface 16 farther from the center of the head cavity of the pre-forged billet 10 extends toward the fixed frame 14, and the end of the first inclined surface 16 closer to the center of the head cavity of the pre-forged billet 10 extends toward the compression spring 2. The engaging cavity is also provided with a second inclined surface 17 that can cooperate with the first inclined surface 16 when the movable half die 5 and the fixed half die 6 are engaged.

[0027] The fixing frame 14 is also provided with a collision block 18 which can abut against one end of the mold sleeve 4 when the movable half mold 5 and the fixed half mold 6 are embraced.

[0028] At least one set of limiting grooves 8 is further provided on both sides of the bottom of the processing groove, and the bottom end of the limiting plate 7 is inserted and fixed in the limiting groove 8 .

[0029] A protruding block 19 is also provided at one end of the half-mold cavity facing the movable half mold 5 and the fixed half mold 6. A channel that is embraced outside the bar 11 is formed between the two groups of protruding blocks 19, and an outward-expanding arc surface 20 is also provided on the side of the protruding block 19 away from the fixed frame 14.

[0030] The forming method based on the above-mentioned large tie rod forging forming device comprises the following steps:

[0031] S1: heating one end of the head of the bar 11 to 1150-1200°C;

[0032] S2: placing one end of the head of the heated bar 11 in S1 into the plate mold cavity of the fixed half mold 6, and the other end of the bar 11 abuts against the limit plate 7;

[0033] S3: Cover the movable half mold 5 on the fixed half mold 6;

[0034] S4: Start the hydraulic cylinder 1 to drive the extrusion punch 3 to extend into the die cavity of the head of the preforging billet 10, and at the same time compress the spring 2 to press the die sleeve 4, so that the movable half die 5 and the fixed half die 6 are fixed together, and the extrusion punch 3 is continuously extended into the die cavity of the head of the preforging billet 10, so that the extrudable heated bar material 11 is upset in the die cavity of the head of the preforging billet 10 to form the preforging billet 10;

[0035] S5: The pre-forged blank 10 formed in S4 is placed in a forming die to forge a finished tie rod forging 12.

[0036] The working principle of the present invention is: through the forming device, by placing the bar 11 on the fixed half die 6, abutting against one end of the limit plate 7, and after closing the movable half die 5, the hydraulic cylinder 1 is started to quickly upset the head of the bar 11 in the head die cavity of the pre-forged billet 10, forming the pre-forged billet 10 with an arc transition between the head of the bar 11 and the body of the bar 11, and because a plurality of limit grooves 8 are provided, when the limit plates 7 are inserted in different limit grooves 8, it can adapt to the forming of bars 11 of different lengths, and because during the forming process, the compression spring is used to compress the bar 11. The elastic pressing die sleeve 4 can hold the movable half die 5 and the fixed half die 6 tightly, so that the die sleeve 4 can always hold the movable half die 5 and the fixed half die 6 tightly as the piston rod of the hydraulic cylinder 1 is extended, and the damage to the main body of the hydraulic cylinder 1 caused by direct rigid collision can be avoided. Therefore, the forming device using this method can extrude the pre-forged billet 10 for bars 11 of different lengths, and realize the integral forging of the super-long tie rod. The tie rod forged by the pre-forged billet 10 obtained by this method does not need welding and has higher tensile strength.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A forming method of a large tie rod forging device, based on a large tie rod forging device, characterized in that: The large tie rod forging device comprises a rigid frame, a hydraulic cylinder, an extrusion punch, a die sleeve, a movable half die, a fixed half die and a limit plate, the rigid frame is provided with a processing groove, the hydraulic cylinder is fixed at one end of the processing groove, and its piston rod is fixedly connected to the extrusion punch, the extrusion punch is provided with a retaining ring at one end facing the hydraulic cylinder, the die sleeve is slidably fitted on the outside of the extrusion punch, and a compression spring is also abutted between the die sleeve and the retaining ring; A fixing frame is also provided in the processing groove, one end of the fixed half die is fixed on the fixing frame, and its half die cavity opening faces upward, and the movable half die is covered and arranged on the upper side of the fixed half die, the fixed half die and the movable half die are arranged opposite to each other and form a preforging blank head die cavity, the extrusion punch extends from one end of the preforging blank head die cavity, extrude and upset one end of the bar material placed in the preforging blank head die cavity, and the other end of the bar material extends out of the preforging blank head die cavity and the fixing frame and abuts against the limiting plate limited on the rigid frame; The mold sleeve is also provided with an engaging cavity which can be engaged with the movable half mold and the fixed half mold under the thrust of the compression spring; At least one set of first sliding blocks are respectively provided on both sides of the mold sleeve, and a sliding groove slidably matched with the sliding blocks is also provided on the side wall of the processing groove; The outer sides of the movable half die and the fixed half die are further provided with a first inclined surface inclined toward the center of the die cavity of the preforged billet head, an end of the first inclined surface farther from the center of the die cavity of the preforged billet head extends toward the fixed frame, and an end of the first inclined surface closer to the center of the die cavity of the preforged billet head extends toward the compression spring, and the engaging cavity is further provided with a second inclined surface that can cooperate with the first inclined surface when the movable half die and the fixed half die are engaged; The fixed frame is also provided with a collision block which can abut against one end of the mold sleeve when the movable half mold and the fixed half mold are embraced; The forming method of the large draw rod forging forming device comprises the following steps: S1: heating one end of the head of the bar to 1150-1200°C; S2: placing one end of the head of the heated bar in S1 into the plate mold cavity of the fixed half mold, and the other end of the bar abuts against the limiting plate; S3: Covering the movable half mold on the fixed half mold; S4: starting the hydraulic cylinder to drive the extrusion punch to extend into the die cavity of the pre-forged billet head, and at the same time, the compression spring presses the die sleeve, so that the movable half die and the fixed half die are fixed together, and the extrusion punch is continuously extended into the die cavity of the pre-forged billet head, so that the extrudable heated bar material is upset in the die cavity of the pre-forged billet head to form a pre-forged billet; S5: placing the pre-forged blank formed in S4 in a forming die to forge a finished tie rod forging.

2. The forming method of a large tie rod forging device according to claim 1, characterized in that: At least one set of limiting grooves is also provided on both sides of the bottom of the processing groove, and the bottom end of the limiting plate is inserted and fixed in the limiting groove.

3. The forming method of a large tie rod forging device according to claim 1, characterized in that: A protruding block is also provided at one end of the half-mold cavity facing the movable half mold and the fixed half mold, and a channel that is embraced outside the bar material is formed between the two groups of protruding blocks, and an outward-expanding arc surface is also provided on the side of the protruding block away from the fixed frame.

Images