Floating structure of precise extrusion die for brake oil pipe joint

Abstract

The utility model relates to a floating structure of a brake oil pipe joint precision extrusion die and belongs to the field of brake oil pipes. The structure comprises a locking piece; the lower die spring seat is fixed on the surface of the locking piece and is provided with a first groove; the third movable mold shell is located in the first groove and fixedly connected with the lower mold spring seat; the third movable mold core is slidably connected to the inner wall of the third movable mold shell; the belleville spring is located in an inner cavity of the lower die spring seat and overlaid between the third movable die core and the locking piece; and a movable cavity is formed between the bottom of the third movable mold core and the lower mold spring seat. According to the floating structure of the precise extrusion die for the brake oil pipe joint, the belleville spring is adopted to replace a traditional rectangular spring and a traditional nitrogen spring, so that the die is stressed more uniformly during use; the problem that increment caused by cold hardening strength of materials in the extrusion process is difficult to overcome by increment of a rectangular spring and a nitrogen spring in the compression process can be effectively solved by selecting a proper stroke.

Description

Technical Field

[0001] The utility model relates to the technical field of brake oil pipes, in particular to a floating structure of a precision extrusion die for a brake oil pipe joint. Background Art

[0002] In the design of cold heading dies, rectangular springs and nitrogen springs are often used, but these two springs have the following defects: Since the rectangular spring rises in a spiral shape, the force-bearing surfaces at the front and rear ends of the spring are only partially stressed during use; in the mold structure, there are generally multiple springs of the same specifications in the cavity of a movable mold. During use, the frequency of failure of each spring is different, which easily leads to uneven force on the mold during use; at the same time, the increment of the force curve of the rectangular spring and the nitrogen spring during the compression process is relatively gentle. This increment is difficult to overcome the increment brought about by the cold work hardening strength of the material during the extrusion process. Therefore, it needs to be improved. Utility Model Content

[0003] Based on this, it is necessary to provide a floating structure for the precision extrusion die of a brake oil pipe joint, as rectangular springs and nitrogen springs are often used in traditional precision extrusion dies for brake oil pipe joints. However, rectangular springs and nitrogen springs are prone to uneven force. At the same time, during the compression process, the increments of the force curves of rectangular springs and nitrogen springs are relatively gentle. This increment is difficult to overcome the increment problem brought about by the cold work hardening strength of the material during the extrusion process.

[0004] The utility model provides a brake oil pipe joint precision extrusion die floating structure, comprising:

[0005] Locking piece;

[0006] a lower die spring seat, fixed on the surface of the locking member and having a first groove;

[0007] a third movable mold shell, located in the first groove and fixedly connected to the lower mold spring seat;

[0008] a third movable mold core, slidably connected to the inner wall of the third movable mold shell;

[0009] a disc spring located in the inner cavity of the lower die spring seat and superimposed between the third movable die core and the locking member;

[0010] Wherein, a movable cavity is provided between the bottom of the third movable mold core and the lower mold spring seat.

[0011] In one embodiment, the bottom of the third movable mold core has a limiting ring, the inner wall of the third movable mold shell is provided with a second groove, the limiting ring is slidably connected in the second groove, and the limiting ring is against the adjacent disc spring.

[0012] In one embodiment, a clamping groove is provided at the bottom of the limiting ring, a floating sleeve is provided in the clamping groove, and the disc spring is sleeved on the outer wall of the floating sleeve.

[0013] In one embodiment, the surface of the locking member is fixedly connected to a limiting sleeve, a third groove is formed on the surface of the limiting sleeve, and a limiting plate is provided at the bottom of the floating sleeve, and the limiting plate is engaged and slidably in the third groove.

[0014] In one embodiment, when the third movable mold core moves in the movable cavity, a portion of the disc spring is arranged on the outer wall of the floating sleeve, and another portion of the disc spring is arranged on the limit sleeve. The limit sleeve has the same outer diameter as the floating sleeve, and the limit sleeve and the floating sleeve are both coaxial with the disc spring.

[0015] In one embodiment, the locking member, the lower mold spring seat and the third movable mold shell are all provided with mounting holes, and bolts are provided in the mounting holes.

[0016] The above-mentioned floating structure of the precision extrusion die of the brake oil pipe joint adopts a disc spring instead of the traditional rectangular spring and nitrogen spring. On the one hand, it can solve the elastic force imbalance caused by the high temperature resistance and inconsistent failure points of the nitrogen spring. At the same time, it solves the force imbalance caused by the force on the local annular surface of the rectangular spring. On the other hand, since the load and stroke relationship of the disc spring is a parabolic decreasing curve, by selecting a suitable stroke, it can effectively solve the problem that the increment of the rectangular spring and nitrogen spring in the compression process is difficult to overcome the increment brought by the cold work hardening strength of the material during the extrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present invention or 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a traditional nitrogen spring brake oil pipe joint extrusion die;

[0019] Figure 2 This is a schematic diagram of the structure of a traditional rectangular spring brake oil pipe joint extrusion die;

[0020] Figure 3 A schematic diagram of a floating structure of a precision extrusion die for a brake oil pipe joint in one embodiment;

[0021] Figure 4 A schematic cross-sectional view of a floating structure of a precision extrusion die for a brake oil pipe joint in one embodiment;

[0022] Figure 5 Schematic diagram of the structure of the third movable mold core in one embodiment;

[0023] Figure 6 Schematic diagram of the floating sleeve and the limiting sleeve structure in one embodiment.

[0024] Reference numerals:

[0025] 11. Nitrogen spring; 12. Piston pin; 13. First movable mold core; 14. Nitrogen spring spacer; 15. First movable mold shell; 21. Rectangular spring; 22. Second movable mold core; 23. Second movable mold shell; 100. Locking piece; 110. Mounting hole; 120. Bolt; 200. Lower mold spring seat; 210. First groove; 300. Third movable mold shell; 310. Second groove; 400. Third movable mold core; 410. Limiting ring; 420. Slot; 500. Disc spring; 600. Movable cavity; 700. Floating sleeve; 710. Limiting plate; 800. Limiting sleeve; 810. Third groove. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this utility model are for illustrative purposes only and do not represent the only implementation method.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this utility model have the same meanings as those commonly understood by those skilled in the art to which this utility model belongs. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used in the specification of this utility model includes any and all combinations of one or more of the relevant listed items.

[0031] In the design of cold heading dies, nitrogen springs and rectangular springs are often used.

[0032] like Figure 1 As shown, the piston pins 12 of the three nitrogen springs 11 push against the first movable mold core 13 to move back and forth, and the gap between the nitrogen spring pad 14 and the first movable mold core 13 is the movable distance of the first movable mold core 13. When the elastic forces of the three nitrogen springs 11 are balanced and consistent, the first movable mold core 13 and the first movable mold shell 15 will be relatively smooth under load and will not interfere with each other. During the extrusion molding process of the product, the material will heat up and cause the temperature of the entire mold cavity to exceed 100°C. The working temperature of the nitrogen spring 11 itself is -20°C to 80°C. At this time, the mold cavity temperature will cause the sealing ring of the nitrogen spring 11 to fail, thereby causing the elastic force of the nitrogen spring 11 to decay and fail. Since the failure time of the three nitrogen springs 11 is not synchronized, the elastic force will be unbalanced, causing the first movable mold core 13 to interfere with the movable mold shell under the unbalanced elastic force state, affecting product quality.

[0033] like Figure 2As shown, since the rectangular spring 21 has a spiral structure, in the stress state, only a partial annular area of the contact part of the rectangular spring 21 is stressed. The partial annular stress area will cause uneven stress on the second movable die core 22 under the load state. When the second movable die core 22 is unevenly stressed under the load, interference will occur between the second movable die core 22 and the second movable die shell 23.

[0034] To solve the problem that the rectangular spring 21 and the nitrogen spring 11 are prone to uneven stress, and at the same time, during the compression process of the rectangular spring 21 and the nitrogen spring 11, the increments of their stress curves are relatively gentle, and it is difficult to overcome the increment brought by the cold work hardening strength of the material during the extrusion process. The following combines Figure 3-Figure 6 to describe the floating structure of the precision extrusion die for the brake oil pipe joint of the present invention.

[0035] As Figure 3 and Figure 4 shown, in one embodiment, a floating structure of a precision extrusion die for a brake oil pipe joint includes a locking member 100, a lower die spring seat 200, a third movable die shell 300, a third movable die core 400, and a disc spring 500.

[0036] The lower die spring seat 200 is fixed on the surface of the locking member 100, and the lower die spring seat 200 has a first groove 210.

[0037] The third movable die shell 300 is located in the first groove 210, and the third movable die shell 300 is fixedly connected to the lower die spring seat 200.

[0038] The third movable die core 400 is slidably connected to the inner wall of the third movable die shell 300.

[0039] The disc spring 500 is located in the inner cavity of the lower die spring seat 200, and the disc spring 500 is stacked between the third movable die core 400 and the locking member 100.

[0040] Since the increments of the stress curves of the rectangular spring 21 and the nitrogen spring 11 are relatively gentle during the compression process, it is difficult to overcome the increment brought by the cold work hardening strength of the material during the extrusion process. The load-stroke relationship of the disc spring 500 shows a parabolic decreasing curve. In the characteristic curve of the disc spring 500, the bending amplitude of the decreasing curve is determined by the h0 / t value. When h0 / t ≤ 0.4, the curve is close to a straight line. When 0.4 < h0 / t ≤ 1, the curve shows a small bend. When 1 < h0 / t < 1.5, the curve shows a large bend. When the stroke of the disc spring 500 is greater than 0.75h, its load increase is limited, but it has a great impact on the service life of the disc spring 500. Therefore, the use stroke of the disc spring 500 is preferably not more than S = 0.75h0.

[0041] The number of disc springs 500 can be adjusted in time according to the demand for elastic force, such as stacking 1 disc, stacking 2 discs in the same direction, and stacking 3 discs in the same direction, so that the elastic force it brings increases exponentially.

[0042] A movable cavity 600 is defined between the bottom of the third movable mold core 400 and the lower mold spring seat 200 .

[0043] The floating structure of the precision extrusion die of the brake oil pipe joint adopts a disc spring 500 to replace the traditional rectangular spring 21 and the nitrogen spring 11. On the one hand, it can solve the elastic force imbalance caused by the high temperature resistance and inconsistent failure points of the nitrogen spring 11. At the same time, it solves the force imbalance caused by the force on the local annular surface of the rectangular spring 21. On the other hand, since the load and stroke relationship of the disc spring 500 is a parabolic decreasing curve, by selecting a suitable stroke, it can effectively solve the problem that the increment of the rectangular spring 21 and the nitrogen spring 11 in the compression process is difficult to overcome the increment caused by the cold work hardening strength of the material during the extrusion process.

[0044] In this embodiment, a limiting ring 410 is provided at the bottom of the third movable mold core 400 , and a second groove 310 is provided on the inner wall of the third movable mold shell 300 . The limiting ring 410 is slidably connected in the second groove 310 , and the limiting ring 410 abuts against the adjacent disc spring 500 .

[0045] By restricting the limiting ring 410 to move only within the movable cavity 600 , the moving range of the third movable mold core 400 can be limited, thereby preventing the third movable mold core 400 from completely separating from the third movable mold shell 300 .

[0046] In this embodiment, see Figure 5 A slot 420 is provided at the bottom of the limiting ring 410 , a floating sleeve 700 is provided in the slot 420 , and the disc spring 500 is sleeved on the outer wall of the floating sleeve 700 .

[0047] Since the disc spring 500 needs to reserve a horizontal compression space in advance during the compression process, and a movable gap of the third movable mold core 400 also needs to be reserved between the third movable mold core 400 and the lower mold spring seat 200, this causes the disc spring 500 to easily fall into the reserved movable gap. By adopting the floating sleeve 700, it can be ensured that the disc spring 500 can be effectively connected in series through the floating sleeve 700 before and after compression, thereby improving the stability of the mold.

[0048] In this embodiment, see Figure 6 The surface of the locking member 100 is fixedly connected to the limiting sleeve 800 , and a third groove 810 is provided on the surface of the limiting sleeve 800 . The bottom of the floating sleeve 700 has a limiting plate 710 , and the limiting plate 710 is fitted and slid in the third groove 810 .

[0049] It should be noted that when the third movable mold core 400 moves in the movable cavity 600, a part of the disc spring 500 is mounted on the outer wall of the floating sleeve 700, and the other part of the disc spring 500 is mounted on the limiting sleeve 800. The limiting sleeve 800 has the same outer diameter as the floating sleeve 700, and the limiting sleeve 800 and the floating sleeve 700 are both coaxial with the disc spring 500.

[0050] By ensuring that the limit plate 710 can always be engaged and slid in the third groove 810 during use of the mold, it can effectively ensure that the disc spring 500 can be effectively connected in series through the floating sleeve 700 and the limit sleeve 800 before and after compression, preventing the disc spring 500 from moving left and right during use, thereby further improving the stability of the mold.

[0051] In this embodiment, the locking member 100 , the lower mold spring seat 200 and the third movable mold shell 300 are all provided with mounting holes 110 , and bolts 120 are provided in the mounting holes 110 .

[0052] By placing the third movable mold core 400 in the third movable mold shell 300, and clamping the floating sleeve 700 in the slot 420, and then sleeve the disc spring 500 between the limit sleeve 800 and the lower mold spring seat 200, and then embedding the limit plate 710 in the third groove 810, and finally screwing the bolt 120 into the mounting hole 110, the mold can be assembled with simple operation and easy use.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and improvements are possible within the scope of the present invention, as would be apparent to one skilled in the art. These variations and improvements fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A floating structure for a precision extrusion die of a brake oil pipe joint, characterized in that: include: Locking piece; a lower die spring seat, fixed on the surface of the locking member and having a first groove; a third movable mold shell, located in the first groove and fixedly connected to the lower mold spring seat; a third movable mold core, slidably connected to the inner wall of the third movable mold shell; a disc spring located in the inner cavity of the lower die spring seat and superimposed between the third movable die core and the locking member; Wherein, a movable cavity is provided between the bottom of the third movable mold core and the lower mold spring seat.

2. The floating structure of the precision extrusion die for the brake oil pipe joint according to claim 1 is characterized in that: The bottom of the third movable mold core is provided with a limiting ring, the inner wall of the third movable mold shell is provided with a second groove, the limiting ring is slidably connected in the second groove, and the limiting ring is against the adjacent disc spring.

3. The floating structure of the precision extrusion die for the brake oil pipe joint according to claim 2, characterized in that: A clamping groove is provided at the bottom of the limiting ring, a floating sleeve is provided in the clamping groove, and the disc spring is sleeved on the outer wall of the floating sleeve.

4. The floating structure of the precision extrusion die for the brake oil pipe joint according to claim 3 is characterized in that: The surface of the locking member is fixedly connected to the limiting sleeve, the surface of the limiting sleeve is provided with a third groove, the bottom of the floating sleeve is provided with a limiting plate, and the limiting plate is embedded and slidably in the third groove.

5. The floating structure of the precision extrusion die for the brake oil pipe joint according to claim 4 is characterized in that: When the third movable mold core moves in the movable cavity, a part of the disc spring is arranged on the outer wall of the floating sleeve, and the other part of the disc spring is arranged on the limit sleeve. The limit sleeve has the same outer diameter as the floating sleeve, and the limit sleeve and the floating sleeve are both coaxial with the disc spring.

6. The floating structure of the precision extrusion die for a brake oil pipe joint according to any one of claims 1 to 5, characterized in that: The locking piece, the lower die spring seat and the third movable die shell are all provided with mounting holes, and bolts are arranged in the mounting holes.

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