A cold extrusion molding equipment for gear production and processing

Abstract

The present invention relates to the technical field of cold extrusion molding, and discloses a cold extrusion molding device for gear production and processing, comprising: an operating table; an extrusion seat, arranged above the operating table; a linear telescopic mechanism, fixed to the top of the operating table, with its telescopic end fixed to the extrusion seat; a molding mechanism, arranged on the top of the operating table, comprising: a mounting base detachably mounted on the top of the operating table, a movable sleeve arranged on the top of the mounting base, a molding die composed of a plurality of mold splicing units, and a contraction drive assembly. The molding mechanism provided by the present invention, by adopting a splicable molding die and a linkage structure, drives the mold units to expand outward during demolding to achieve complete separation of the gear from the inner wall of the mold cavity, greatly reduces demolding friction resistance, and avoids scratches and wear on the mold surface; the modular mold design supports individual replacement of units, significantly reduces maintenance costs and extends the overall life of the mold.

Description

Technical Field

[0001] The present invention relates to the technical field of cold extrusion molding, and more particularly to cold extrusion molding equipment for gear production and processing. Background Art

[0002] The gear cold extrusion forming process is an advanced processing technology that directly obtains high-precision tooth shape by causing metal billets to undergo plastic deformation in a closed mold cavity under high pressure and room temperature. Compared with traditional cutting processes, it has significant advantages such as high material utilization, fast processing efficiency and excellent product mechanical properties.

[0003] However, the molding dies used in existing cold extrusion molding equipment are mostly one-piece structures. When processing gears with complex tooth shapes or those with dense numbers of teeth, the molded gears fit tightly against the inner wall of the mold cavity, and the friction resistance increases significantly during demolding. Due to the plastic deformation characteristics of the metal blank during the extrusion molding process, the surface of the molded gear inevitably has a certain degree of roughness and burrs. When the mold is forcibly demolded through the ejection mechanism, the raised parts of the gear surface are prone to scratching against the inner wall of the mold cavity, which not only leads to further increase in demolding resistance, but also causes scratches and wear on the mold cavity surface. As the production batches increase, the mold wear rate accelerates, making it difficult to meet the requirements of large-scale continuous production for mold life and processing accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a cold extrusion forming equipment for gear production and processing to solve the above-mentioned technical problems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] The present invention provides a cold extrusion forming device for gear production and processing, comprising:

[0007] operating table;

[0008] Extrusion seat, located above the operating table;

[0009] The linear telescopic mechanism is fixed on the top of the operating table, and its telescopic end is fixed to the extrusion seat;

[0010] The forming mechanism is provided on the top of the operating table and includes: a mounting base detachably mounted on the top of the operating table, a movable sleeve provided on the top of the mounting base, a forming die formed by a plurality of mold splicing units, and a contraction drive assembly, wherein the movable sleeve is coaxially sleeved on the outside of the forming die, and the contraction drive assembly connects the movable sleeve and each mold splicing unit to drive the forming die to switch between a contracted posture and an expanded posture;

[0011] The ejection mechanism is arranged on the operating table and includes: a telescopic drive source and a lifting assembly connected to the telescopic end of the telescopic drive source. The lifting assembly includes a driving part connected to the movable sleeve and an ejection part located below the mounting base. The ejection part is used to eject the formed gear part.

[0012] Preferably, the contraction drive assembly includes a transmission gear rotating in the mounting base, an active rack and a driven rack respectively meshed with both sides of the transmission gear, the active rack is connected to the movable sleeve, and the driven rack is connected to the corresponding forming mold splicing unit.

[0013] Preferably, a plurality of balls are provided at the bottom of each mold splicing unit, and the balls are in rolling contact with the upper surface of the mounting base.

[0014] Preferably, a limiting slider is fixed to the upper end of each mold splicing unit, and a limiting groove adapted to the limiting slider is provided on the inner side of the movable sleeve.

[0015] Preferably, a slope is provided on the middle portion of the outer side of each mold splicing unit, and a groove that is tightly fitted with the slope is correspondingly provided on the inner side of the movable sleeve.

[0016] Preferably, the driving part is at least two connecting rods fixed to the telescopic end of the telescopic driving source, and the connecting rods slide through the operating table and the mounting base and are fixed to the movable sleeve. The ejecting part is a push rod fixed to the top end of the telescopic end of the telescopic driving source.

[0017] Preferably, the top end of the connecting rod is higher than the top end of the mandrel, and the connecting rod and the mandrel rise and fall synchronously.

[0018] Preferably, the linear telescopic mechanism is a hydraulic cylinder, and both sides of the extrusion seat are slidably connected to a sliding rod fixed on the top of the operating table.

[0019] Preferably, the number of the mold splicing units is four, and adjacent mold splicing units are equidistantly contracted or expanded by a contraction drive assembly.

[0020] Preferably, the driven rack is detachably fixed to the outside of the mold splicing unit by bolts.

[0021] The beneficial effects of the present invention are:

[0022] The molding mechanism provided in the present invention adopts a splicable molding mold and a linkage structure, which drives the mold unit to expand outward during demolding to achieve complete separation of the gear and the inner wall of the mold cavity, greatly reducing the friction resistance of demolding and avoiding scratches and wear on the mold surface; the modular mold design supports individual replacement of units, significantly reducing maintenance costs and extending the overall life of the mold; at the same time, through the coordinated locking of the movable sleeve and the contraction drive assembly, it is ensured that the mold is in a stable tightening posture during extrusion, thereby improving the gear molding accuracy and mechanical properties, and meeting the needs of large-scale continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a cold extrusion molding device for gear production and processing provided by the present invention;

[0024] Figure 2 This is a side view of a cold extrusion molding device for gear production and processing provided by the present invention;

[0025] Figure 3 This is a schematic structural diagram of a forming mechanism and an ejection mechanism in a cold extrusion forming device for gear production and processing provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure inside a forming die in a cold extrusion forming device for gear production and processing provided by the present invention;

[0027] Figure 5 This is a cross-sectional view of the local position of the forming mechanism in a cold extrusion forming equipment for gear production and processing provided by the present invention;

[0028] Figure 6 It is a side view of a forming mechanism and an ejection mechanism in a cold extrusion forming device for gear production and processing provided by the present invention;

[0029] Figure 7 This is a structural schematic diagram of the forming die and the shrinkage drive assembly in a cold extrusion forming device for gear production and processing provided by the present invention.

[0030] In the figure: 1. Operating table; 2. Extrusion seat; 3. Linear telescopic mechanism; 4. Forming mechanism; 41. Mounting base; 42. Movable sleeve; 421. Limiting groove; 43. Forming mold; 431. Mold splicing unit; 432. Ball; 433. Limiting slider; 44. Retraction drive assembly; 441. Transmission gear; 442. Active rack; 443. Driven rack; 5. Ejection mechanism; 51. Telescopic drive source; 52. Lifting assembly; 521. Connecting rod; 522. Ejector rod; 6. Blank. DETAILED DESCRIPTION

[0031] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0032] Please refer to Figures 1 to 4A cold extrusion molding equipment for gear production and processing comprises: an operating table 1, an extrusion base 2, a linear telescopic mechanism 3, a molding mechanism 4, and an ejection mechanism 5. The extrusion base 2 is located above the operating table 1, with an extrusion head compatible with the molding mechanism 4 mounted at its bottom. The linear telescopic mechanism 3 is fixed to the top of the operating table 1, with its telescopic end fixedly connected to the top of the extrusion base 2. The linear telescopic mechanism 3 is a hydraulic cylinder. Four slide bars are also fixed to the top of the operating table 1. The four slide bars are slidably connected to the sides of the extrusion base 2, respectively, to stabilize and limit the extrusion base 2. The forming mechanism 4 is arranged on the top of the operating table 1, and includes a mounting base 41 that can be detachably mounted on the top of the operating table 1, a movable sleeve 42 arranged on the top of the mounting base 41, a forming mold 43 composed of several mold splicing monomers 431, and a contraction drive assembly 44. The movable sleeve 42 is coaxially sleeved on the outside of the forming mold 43, and the contraction drive assembly 44 connects the movable sleeve 42 and each mold splicing monomer 431. The number of mold splicing monomers 431 is generally set to four, and a plurality of balls 432 are provided at the bottom of each mold splicing monomer 431, and the balls 432 are in rolling contact with the upper surface of the mounting base 41. The ball bearings 432 are used to reduce the friction between the mold splicing monomers 431 and the mounting base 41. A limiting slider 433 is fixed to the upper end of each mold splicing monomer 431, and the movable sleeve 42 is provided with a limiting groove 421 that slides with the limiting slider 433. The limiting slider 433 and the limiting groove 421 slide in cooperation, which can play a lateral limiting role on the mold splicing monomer 431, so that the mold splicing monomer 431 can remain stable during contraction and expansion. In addition, a slope is provided in the middle of the outer side of each mold splicing monomer 431, and a groove is provided on the inner side of the movable sleeve 42 that matches the slope. After the mold splicing monomer 431 is closed, the groove on the inner side of the movable sleeve 42 is tightly fitted with the mold splicing monomer 431 to squeeze and press the outer side of the spliced ​​forming mold 43. The ejection mechanism 5 is arranged in the operating table 1, which includes a telescopic drive source 51 and a lifting assembly 52 connected to the telescopic end of the telescopic drive source 51. The lifting assembly 52 includes a driving part connected to the movable sleeve 42 and an ejection part located below the mounting base 41. The telescopic drive source 51 can be an electric push rod.

[0033] When processing the gear, the forming mold 43 is in a closed state, and the blank 6 is placed in the forming mold 43. The linear telescopic mechanism 3 extends downward, which can drive the extrusion seat 2 to move downward step by step, and finally the extrusion head at the bottom of the extrusion seat 2 generates an extrusion force on the blank 6, causing the blank 6 to be deformed in the forming mold 43 and finally extruded into a gear shape. Afterwards, the linear telescopic mechanism 3 begins to contract, driving the extrusion seat 2 to move upward and separate from the forming mold 43, and then the telescopic driving source 51 extends, which can make the driving part and the ejection part move upward together. The upward movement of the driving part can drive the movable sleeve 42 to move upward synchronously, and the contraction driving component 44, driven by the movable sleeve 42, synchronously drives the corresponding mold splicing monomer 431 to move closer to the movable sleeve 42, so that the formed gear part and the mold splicing monomer 431 are gradually separated. When the top of the ejection part moves upward and contacts the bottom of the formed gear part, the mold splicing monomer 431 has been completely separated from the formed gear part, so that the forming mold 43 is in an expanded posture, thus realizing the forming process. The gear part and the forming mold 43 have an automatic and quick separation function. After that, the linear telescopic mechanism 3 continues to extend, which can drive the ejection part to push up the formed gear part, and the movable sleeve 42 continues to be driven by the driving part to move upward until the formed gear part moves to the top of the forming mold 43, and the formed gear part can be removed. The telescopic driving source 51 contracts, which can drive the ejection part and the driving part to move downward together. The movable sleeve 42 begins to move downward with the driving part and drives the contraction driving component 44 to move, so that the contraction driving component 44 synchronously drives the corresponding mold splicing monomer 431 away from the movable sleeve 42. The four mold splicing monomers 431 gradually gather together, and when each mold splicing monomer 431 is closed, an interference fit of 0.02-0.05mm is formed between adjacent monomers, and finally spliced ​​into a complete forming mold 43, so that the forming mold 43 switches to a tightening posture. At this time, the processing operation of a gear part is completed, and then a new blank 6 is placed in the forming mold 43. The above steps are repeated to continuously produce gear parts. It can be seen that the above-mentioned molding mechanism 4 has a dynamic contraction mechanism. During the extrusion stage, the movable sleeve 42 and the contraction drive assembly 44 are used to double-lock the spliced ​​molding mold 43 to ensure that the mold maintains a stable tightening posture when subjected to high pressure; during the demolding stage, the posture switching is used to make the various splicing units of the mold expand outward to achieve complete separation of the gear and the mold cavity. This process greatly reduces the friction resistance and surface scratch risk between the gear and the mold cavity during ejection, and effectively protects the integrity of the inner wall of the mold; at the same time, the modular splicing structure design is adopted, which can achieve rapid and independent replacement when a single mold splicing unit 431 is damaged, significantly reducing the mold maintenance cost, avoiding the scrapping of adjacent intact mold components, and improving resource utilization.

[0034] Please refer to Figures 3 to 6The contraction drive assembly 44 includes a transmission gear 441 rotating in the mounting base 41, an active rack 442 and a driven rack 443 respectively meshing with the two sides of the transmission gear 441, the active rack 442 is connected to the movable sleeve 42, and the driven rack 443 is connected to the corresponding forming mold 43 splicing monomer. The driven rack 443 is fixed to the outer side of the mold splicing monomer 431 by multiple bolts. When the mold splicing monomer 431 is damaged, it can be replaced separately.

[0035] The operation process of the above-mentioned contraction drive assembly 44 is as follows: after the gear piece is formed, the active rack 442 can be driven to move upward by moving the movable sleeve 42, and the transmission gear 441 starts to rotate under the driving action of the active rack 442, and the driven rack 443 is driven by the active rack 442 to start moving horizontally, and finally drives the mold splicing monomer 431 connected thereto to move closer to the inner side of the movable sleeve 42, so that the molding mold 43 switches to the expanded posture, and after the formed gear piece is taken out, the movable sleeve 42 starts to move downward, so that the active rack 442 starts to move downward, and the transmission gear 441 drives the driven rack 443 to move back to its original position, and the mold splicing monomer 431 returns to its initial position. The forming mold 43 switches to a tightening posture, and then the blank 6 is placed in the forming mold 43. During the process of being squeezed and deformed, the bottom of the mold splicing unit 431 is locked by the contraction drive component 44, and the middle part of its outer side is squeezed and tightened by the inner groove of the movable sleeve 42, so that the forming mold 43 can always be in a stable tightening posture when subjected to force, to ensure that the blank 6 is smoothly extruded into a gear part. In this way, the contraction drive component 44 can not only coordinate and link the movable sleeve 42 and the mold splicing unit 431 to realize the posture switching of the forming mold 43, but the contraction drive component 44 itself also has the function of locking the forming mold 43.

[0036] Please refer to Figure 3 and Figure 7 The driving part is at least two connecting rods 521 fixed to the telescopic end of the telescopic driving source 51. The connecting rods 521 slide upward in sequence through the operating table 1 and the mounting base 41 and are connected to the movable sleeve 42. The ejecting part is a push rod 522 fixed to the top end of the telescopic end of the telescopic driving source 51. In the present invention, two connecting rods 521 are provided, and the two connecting rods 521 are symmetrically distributed at both ends of the telescopic end of the telescopic driving source 51.

[0037] When the above-mentioned ejection mechanism 5 is in use, the telescopic driving source 51 is extended to drive the ejector rod 522 and the connecting rod 521 to move upward together. Since the top of the connecting rod 521 is higher than the top of the ejector rod 522, the connecting rod 521 first drives the movable sleeve 42 to move upward, and then the top of the ejector rod 522 begins to contact the bottom of the molded gear part, and then the molded gear part is ejected, thereby realizing the function of automatically ejecting the molded gear part. The ejection mechanism 5 is used in conjunction with the movable sleeve 42 to realize the function of switching the molding die 43 to the expanded posture before ejecting the molded gear part. In this way, there is no need to set a separate driving source to drive the movable sleeve 42 to rise and fall, and the cost of use is lower.

[0038] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms under the guidance of the present invention, all of which are protected by the present invention.

Claims

1. A cold extrusion molding equipment for gear production and processing, characterized in that: include: operating table; Extrusion seat, located above the operating table; The linear telescopic mechanism is fixed on the top of the operating table, and its telescopic end is fixed to the extrusion seat; The forming mechanism is located on the top of the operating table and includes: a mounting base detachably mounted on the top of the operating table, a movable sleeve located on the top of the mounting base, a forming mold formed by a plurality of mold splicing units, and a contraction drive assembly. The movable sleeve is coaxially mounted on the outside of the forming mold. The contraction drive assembly connects the movable sleeve and each mold splicing unit to drive the forming mold to switch between a contracted posture and an expanded posture. The ejection mechanism is provided on the operating table and includes: a telescopic drive source and a lifting assembly connected to the telescopic end of the telescopic drive source, the lifting assembly including a driving portion connected to the movable sleeve and an ejection portion located below the mounting base, the ejection portion being used to eject the formed gear member; The driving part is at least two connecting rods fixed to the telescopic end of the telescopic driving source, and the connecting rods are fixed to the movable sleeve after sliding through the operating table and the mounting base. The ejecting part is a push rod fixed to the top end of the telescopic end of the telescopic driving source; The top end of the connecting rod is higher than the top end of the mandrel, and the connecting rod and the mandrel rise and fall synchronously; The contraction drive assembly includes a transmission gear rotating in the mounting base, an active rack and a driven rack respectively meshed with both sides of the transmission gear, the active rack is connected to the movable sleeve, and the driven rack is connected to the corresponding forming mold splicing unit.

2. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: A plurality of balls are provided at the bottom of each mold splicing unit, and the balls are in rolling contact with the upper surface of the mounting base.

3. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: The upper ends of the mold splicing units are all fixed with limiting sliders, and the inner side of the movable sleeve is provided with limiting grooves adapted to the limiting sliders.

4. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: The middle part of the outer side of the mold splicing unit is provided with a slope surface, and the inner side of the movable sleeve is correspondingly provided with a groove that is tightly matched with the slope surface.

5. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: The linear telescopic mechanism is a hydraulic cylinder, and both sides of the extrusion seat are slidably connected to the sliding rod fixed on the top of the operating table.

6. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: The number of the mold splicing units is four, and adjacent mold splicing units are equidistantly contracted or expanded by a contraction drive assembly.

7. The cold extrusion molding equipment for gear production and processing according to claim 1, characterized in that: The driven rack is detachably fixed to the outer side of the mold splicing unit by bolts.

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