CN114273592B - Partial thickening forming method and mold for unequal-thickness side wall of cylindrical part - Google Patents
Partial thickening forming method and mold for unequal-thickness side wall of cylindrical part Download PDFInfo
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- CN114273592B CN114273592B CN202111592488.8A CN202111592488A CN114273592B CN 114273592 B CN114273592 B CN 114273592B CN 202111592488 A CN202111592488 A CN 202111592488A CN 114273592 B CN114273592 B CN 114273592B
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Abstract
The invention discloses a partial thickening forming method and a die for a cylinder part unequal-thickness side wall, wherein the forming method comprises the following steps: 1, placing a cylindrical metal blank with proper size in a female die, and driving an upper die base to move downwards so as to enable an inner male die, an outer male die and an upsetting male die to be in contact with the blank; 2, the upper die holder moves downwards at a uniform speed, the inner punch and the outer punch are static, and the upsetting punch moves downwards to shape and thicken the cylindrical part; 3, continuously moving the upsetting male die downwards, and moving the outer convex die upwards at the moment to locally thicken the side wall of the cylindrical part; and 4, after the partial thickening of the side wall of the cylinder part is finished, returning the upper die holder to the upper dead point, and ejecting the part by the ejector rod to finish demoulding. The invention effectively reduces the manufacturing cost of the die, has simple structure and high production efficiency, solves the buckling instability problem during upsetting, eliminates the defects of folding, concave and the like, and has the advantages of high dimensional accuracy, long service life of the die and the like.
Description
Technical Field
The invention relates to the field of plastic forming processing of metal materials, in particular to a partial thickening forming method and a die for a non-uniform thickness side wall of a cylinder.
Background
In practical engineering application, a cylindrical deep drawing piece with a thicker local side wall is needed in many cases, but because buckling instability, folding and other problems are considered when the local side wall of the cylindrical piece is thickened locally, a plurality of dies are often needed to be replaced for multiple upsetting treatments to obtain the needed part, so that the production efficiency is low, and the production cost is greatly increased.
Therefore, how to change the current situation of high production cost, low production efficiency and the like when the partial thickening of the side wall with different thickness of the cylinder part in the prior art becomes a problem to be solved urgently by the person skilled in the art
Disclosure of Invention
The invention aims to provide a method and a die for forming partial thickening of a side wall of a cylinder part with unequal thickness, which are used for solving the problems of the prior art, and forming the cylinder part with the partial thickening of the side wall in one process.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a forming die for locally thickening the side wall of a cylindrical part, which comprises an upper die holder, a discharging spring, a strong spring, a male die fixing plate, a male die base plate, an inner male die, an outer male die, an upsetting male die, a female die fixing plate, a lower die holder and a push rod. The inner male die is connected with the outer male die, the outer male die and the upsetting male die in a coaxial mode in a sliding mode, the inner male die is connected with the upper die base through bolts, the powerful springs are arranged between the inner male die and the upper die base and sleeved on the bolts, the outer male die is connected with the upper die base through the bolts, the discharging springs are arranged between the outer male die and the upper die base and sleeved on the bolts, and the elastic force of the discharging springs is smaller than that of the powerful springs. The upsetting male die is connected with the upper die base through the male die fixing plate and the male die base plate.
Preferably, the inner punch and the outer punch, the outer punch and the upsetting punch, and the upsetting punch and the female die are in clearance fit.
Preferably, the inner punch and the outer punch are matched with each other by adopting H6/H5, and the outer punch and the upsetting punch are matched with the female die by adopting H7/g 6.
The invention also provides a partial thickening forming method of the non-uniform thickness side wall of the cylindrical part, which utilizes the partial thickening forming die of the non-uniform thickness side wall of the cylindrical part and comprises the following steps:
firstly, placing a cylindrical metal plate blank with proper size into a female die, and driving an upper die base to move downwards so as to enable an inner male die, an outer male die and an upsetting male die to be in contact with the plate blank;
step two, the upper die holder moves downwards at a uniform speed, at the moment, the inner punch and the outer punch are stationary, and the upsetting punch moves downwards to shape and thicken the cylindrical part;
step three, the upper die holder drives the upsetting male die to continuously move downwards, and at the moment, the outer convex die moves upwards to locally thicken the side wall of the cylindrical part;
and fourthly, after the partial thickening of the side wall of the cylindrical part is finished, the upper die holder moves upwards to the upper dead center, the ejector rod moves upwards to eject the part, and the demoulding is completed.
The gap between the outer wall of the outer male die and the inner wall of the female die is preferably 1.2-1.5 times of the thickness of the side wall of the cylindrical part.
Compared with the prior art, the invention has the following technical effects:
the invention provides a cylinder part unequal-thickness side wall local thickening forming die which comprises an upper die holder, a discharging spring, a strong spring, a male die fixing plate, a male die base plate, an inner male die, an outer male die, an upsetting male die, a female die fixing plate, a lower die holder and a push rod. The inner male die is connected with the outer male die, the outer male die and the upsetting male die in a coaxial mode in a sliding mode, the inner male die is connected with the upper die base through bolts, the powerful springs are arranged between the inner male die and the upper die base and sleeved on the bolts, the outer male die is connected with the upper die base through the bolts, the discharging springs are arranged between the outer male die and the upper die base and sleeved on the bolts, and the elastic force of the discharging springs is smaller than that of the powerful springs. The upsetting male die is connected with the upper die base through the male die fixing plate and the male die base plate. The invention also provides a partial thickening forming method of the side wall of the cylinder part with unequal thickness, when the part is formed, the prefabricated deep drawing part is placed in the female die, the upper die holder connected with the press is controlled to move downwards, the deep drawing part is shaped and thickened, the outer punch moves upwards under the extrusion force of metal along with the downward movement of the upsetting punch, the stroke of the upper die holder is controlled to carry out partial thickening on the side wall of the cylinder part, the height of the partial thickening is controlled, and the forming area of the outer punch can design the size according to actual requirements and control the thickness of the partial thickening. The invention realizes the local thickening of the side wall of the cylinder part in one procedure, effectively solves the problems of buckling instability, folding and the like, improves the production efficiency of products, and has the advantages of simple procedure, high forming precision and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the prior art, the drawings which are needed in the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing a sectional structure of a forming die for partial thickening of a side wall of a cylindrical member according to the present invention in operation;
FIG. 2 is a schematic view showing a sectional structure of a forming die for partial thickening of a side wall of a cylindrical member according to the present invention in another working state:
FIG. 3 is a schematic view of a cylindrical blank when formed by a method for forming partial thickenings of side walls of a cylindrical part according to the invention;
FIG. 4 is a schematic view of a shaped thickened blank when formed by a method for forming partial thickening of a non-uniform thickness sidewall of a cylindrical member according to the present invention;
FIG. 5 is a partial thickening slab intended for forming by a method of partial thickening a sidewall of a cylindrical member of the present invention;
wherein 1 is the upper die base, 2 is the bolt, 3 is the powerful spring, 4 is the unloading spring, 5 is the evagination mould, 6 is the punch fixing plate, 7 is the inner punch, 8 is the punch backing plate, 9 is the die, 10 is the die holder, 11 is the ejector pin, 12 is the die fixing plate, 13 is the upsetting punch, 14 is the screw.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a partial thickening forming method for a non-uniform thickness side wall of a cylindrical part, which solves the problems of the prior art.
Referring to fig. 1-5, fig. 1 is a schematic sectional view of a forming die for partial thickening of a sidewall of a cylindrical member according to the present invention, fig. 2 is a schematic sectional view of a forming die for partial thickening of a sidewall of a cylindrical member according to the present invention in another working state, fig. 3 is a schematic view of a slab of a cylindrical member according to a forming method for partial thickening of a sidewall of a cylindrical member according to the present invention, fig. 4 is a schematic view of a shaping and thickening slab according to a forming method for partial thickening of a sidewall of a cylindrical member according to the present invention, and fig. 5 is a schematic view of a partial thickening slab according to a forming method for partial thickening of a sidewall of a cylindrical member according to the present invention.
The invention discloses a partial thickening forming method of a cylinder part unequal-thickness side wall, which comprises the following steps:
firstly, placing a cylindrical metal plate blank with proper size into a female die, and driving an upper die base to move downwards so as to enable an inner male die, an outer male die and an upsetting male die to be in contact with the plate blank;
step two, the upper die holder moves downwards at a uniform speed, at the moment, the inner punch and the outer punch are stationary, and the upsetting punch moves downwards to shape and thicken the cylindrical part;
step three, the upper die holder drives the upsetting male die to continuously move downwards, and at the moment, the outer convex die moves upwards to locally thicken the side wall of the cylindrical part;
and fourthly, after the partial thickening of the side wall of the cylindrical part is finished, the upper die holder moves upwards to the upper dead center, the ejector rod moves upwards to eject the part, and the demoulding is completed.
In the first step, the outer diameter is D 0 The height is H 0 The wall thickness is T 0 The cylindrical part slab is placed in a female die 9, the inner diameter of the female die is equal to the outer diameter of the cylindrical part slab, and the upper die holder is controlled to move downwards so that the inner male die, the outer male die and the upsetting male die are in contact with the slab.
In the second step, the upper die holder drives the upsetting male die to descend, and the cylindrical part plate blank is shaped and thickened to have the height H 1 Thickness T 1 。
In the third step, as the upsetting male die further descends, the metal flow pressure of the side wall of the cylinder part is increased, so that the male die moves upwards to obtain the local wall thickness T 2 The overall height is H 2 A local thickening height of H 3 Is provided for the required parts of the assembly. In practical application, H can be controlled according to practical requirements 2 、H 3 And T is the height of (2) 2 Thickness of (2)
In the fourth step, the upper die holder moves up to the top dead center, and the ejector rod pushes out the formed part, so that one working cycle is completed.
In addition, the inner male die and the outer male die, the outer male die and the upsetting male die, and the upsetting male die and the female die are in clearance fit, so that the integral assembly precision of the die is improved.
In the specific embodiment, the inner male die and the outer male die are matched with each other by adopting H6/H5, and the outer male die and the upsetting male die are matched with the female die by adopting H7/g 6.
The principles and embodiments of the present invention have been described with reference to specific examples, which are provided herein to facilitate understanding of the methods and core concepts of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The forming die is characterized by comprising an upper die seat, a discharging spring, a strong spring, a male die fixing plate, a male die base plate, an inner male die, an outer male die, an upsetting male die, a female die fixing plate, a lower die seat and a push rod, wherein the inner male die, the outer male die and the upsetting male die are coaxially arranged and slidingly connected, the inner male die is connected with the upper die seat through bolts, the strong spring is arranged between the inner male die and the upper die seat and sleeved with the strong spring, the outer male die is connected with the upper die seat through bolts, the discharging spring is arranged between the outer male die and the upper die seat and sleeved with the discharging spring, the elasticity of the discharging spring is smaller than that of the strong spring, and the upsetting male die is connected with the upper die seat through the male die fixing plate and the male die base plate.
2. The forming die for partial thickening of the non-uniform-thickness side wall of the cylindrical member according to claim 1, wherein the inner punch and the outer punch, the outer punch and the upsetting punch, and the upsetting punch and the female die are in clearance fit.
3. The mold for forming partial thickenings of side walls of unequal thicknesses of cylindrical articles according to claim 1, wherein: the gap between the outer wall of the outer male die and the inner wall of the female die is 1.2-1.5 times of the thickness of the side wall of the cylindrical part.
4. The mold for forming partial thickenings of side walls of unequal thicknesses of cylindrical articles according to claim 1, wherein: the thickness dimension of the forming area of the outer convex mould can be adjusted according to practical application, and the local thickening thickness of the side wall of the cylinder piece is controlled.
5. A method for forming partial thickening of a non-uniform thickness side wall of a cylindrical member, using a forming die for forming partial thickening of a non-uniform thickness side wall of a cylindrical member according to any one of claims 1 to 3, characterized in that:
firstly, placing a cylindrical metal plate blank with proper size into a female die, and driving an upper die base to move downwards so as to enable the inner male die, the outer male die and the upsetting male die to be in contact with the cylindrical metal plate blank;
step two, the upper die holder moves downwards at a uniform speed, at the moment, the inner punch and the outer punch are stationary, and the upsetting punch moves downwards to shape and thicken the side wall of the cylindrical metal plate blank;
step three, the upper die holder drives the upsetting male die to continuously move downwards, and at the moment, the outer convex die moves upwards to locally thicken the side wall of the cylindrical metal plate blank;
and fourthly, after the partial thickening of the side wall of the cylindrical metal plate blank is finished, the upper die holder moves upwards to the upper dead point, the ejector rod moves upwards to eject the formed part, and the demoulding is completed.
6. The method for partial thickening of a non-uniform thickness sidewall of a cylindrical member according to claim 5, wherein:
in the third step, when the upsetting male die moves downwards and the extrusion force of metal flow is larger than the pressure given to the outer male die by the unloading spring, the outer male die moves upwards, and the side wall of the cylindrical part is locally thickened.
7. The method for partial thickening of a non-uniform thickness sidewall of a cylindrical member according to claim 5, wherein:
in step three, the local thickening height of the side wall of the cylindrical member can be controlled by controlling the stroke of the upsetting punch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111592488.8A CN114273592B (en) | 2021-12-23 | 2021-12-23 | Partial thickening forming method and mold for unequal-thickness side wall of cylindrical part |
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| CN202111592488.8A CN114273592B (en) | 2021-12-23 | 2021-12-23 | Partial thickening forming method and mold for unequal-thickness side wall of cylindrical part |
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| CN114273592A CN114273592A (en) | 2022-04-05 |
| CN114273592B true CN114273592B (en) | 2023-06-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108637151A (en) * | 2018-03-17 | 2018-10-12 | 中北大学 | A kind of lightweight special-shaped shell body partial plastic forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000024745A (en) * | 1998-07-08 | 2000-01-25 | Toyota Motor Corp | Thickened pressing method |
| CN1817553A (en) * | 2006-03-14 | 2006-08-16 | 广东工业大学 | Wall thickening forming process and mould for metal thin plate local tubular projection table |
| KR100921443B1 (en) * | 2008-12-23 | 2009-10-13 | 일진금속공업 주식회사 | A method of compressor pulley for car air conditioner |
| CN101773975B (en) * | 2010-04-12 | 2011-08-10 | 华中科技大学 | Board upsetting and shaping die |
| KR101787925B1 (en) * | 2013-11-29 | 2017-10-18 | 신닛테츠스미킨 카부시키카이샤 | Method for forming closed-bottom cylindrical container |
| JP6612600B2 (en) * | 2015-11-24 | 2019-11-27 | 日本特殊陶業株式会社 | Manufacturing method by cold forging of cylindrical metal fittings with polygonal flanges |
| CN112139424B (en) * | 2020-09-21 | 2022-04-08 | 湘潭大学 | Cylindrical part plate forging forming die with small round corner characteristic and method |
| CN113020516B (en) * | 2021-04-01 | 2023-03-14 | 湘潭大学 | Method and die for forging unequal-thickness metal piece plate with flange structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108637151A (en) * | 2018-03-17 | 2018-10-12 | 中北大学 | A kind of lightweight special-shaped shell body partial plastic forming method |
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