CN114406081A

CN114406081A - Steel ring hub, machining die and manufacturing method thereof

Info

Publication number: CN114406081A
Application number: CN202011169408.3A
Authority: CN
Inventors: 孙愉后; 孙长春; 孙振兴; 孙团结
Original assignee: Fujian Jinjiang Lijing Automotive Fittings Co ltd
Current assignee: Fujian Jinjiang Lijing Automotive Fittings Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2022-04-29

Abstract

The present disclosure provides a method for manufacturing a steel ring hub, including: determining the shape and size of a planar metal plate piece unfolded by the steel ring hub according to the required size of the formed steel ring hub, and performing cold cutting by adopting an integral metal plate piece material to obtain the planar metal plate piece; heating the planar metal plate to 800-900 ℃ or saponifying the surface of the planar metal plate, and then putting the planar metal plate into a stretching die for stretching and forming to obtain a preformed blank; sleeving the preformed blank into a rolling forming die, and repeatedly rolling the blank to obtain a rolling formed blank; carrying out heat treatment on the blank formed by rolling, including quenching and tempering treatment; and (3) performing cutting processing on the blank after the heat treatment to obtain a semi-finished product of the steel ring hub, and performing surface treatment and packaging on the semi-finished product to obtain a finished product as required.

Description

Steel ring hub, machining die and manufacturing method thereof

Technical Field

The disclosure relates to the field of automobile part processing, in particular to a steel ring hub, a processing die and a manufacturing method thereof.

Background

At present, the manufacturing technology of the heavy truck steel ring wheel hub mainly comprises casting, forging and welding two parts after rolling of a metal plate part, wherein molten iron is poured into a model for cooling forming in the casting process, and due to process limitation, air holes are easily generated inside the wheel hub, and the strength of the wheel hub is influenced due to insufficient tissue density. The forging cost is high, and the welding process requirement is high and the relative cost is high due to the high requirement of the welding seam in the plate assembly welding. For heavy trucks, there are high demands on the strength and performance of the wheel hub.

Disclosure of Invention

Technical problem to be solved

The present disclosure provides a steel ring hub, a machining mold thereof and a manufacturing method thereof to at least partially solve the above-mentioned technical problems.

(II) technical scheme

According to an aspect of the present disclosure, there is provided a method of manufacturing a steel ring hub, including:

determining the shape and size of a planar metal plate piece unfolded by the steel ring hub according to the required size of the formed steel ring hub, and performing cold cutting by adopting an integral metal plate piece material to obtain the planar metal plate piece;

heating the planar metal plate to 800-900 ℃ or saponifying the surface of the planar metal plate, and then putting the planar metal plate into a stretching die for stretching and forming to obtain a preformed blank;

sleeving the preformed blank into a rolling forming die, and repeatedly rolling the blank to obtain a rolling formed blank;

carrying out heat treatment on the blank formed by rolling, including quenching and tempering treatment;

and (3) performing cutting processing on the blank after the heat treatment to obtain a semi-finished product of the steel ring hub, and performing surface treatment and packaging on the semi-finished product to obtain a finished product as required.

According to an embodiment of the present disclosure, the placing into a stretching mold for stretching and forming to obtain a preformed blank includes:

the planar metal plate part is placed between a female die at the upper part of the stretching die and a male die at the lower part of the stretching die and is positioned on the male die;

in the process of pressing the female die downwards, a pressing block of the stretching die firstly presses the planar metal plate part, so that the planar metal plate part is not deviated;

and after the plane plate part is tightly pressed, the concave die performs reverse stretching forming on the plane plate part to obtain a preformed blank.

According to the embodiment of the disclosure, the step of sleeving the preformed blank into the rolling forming die and repeatedly rolling the blank to obtain the rolling formed blank comprises the following steps:

placing the preformed blank between an upper male die and a lower female die of a rolling forming die, and mutually extruding the upper male die and the lower female die;

in the relative extrusion process, the rolling wheel dies on two sides roll the workpiece at the same time, and the longitudinal and transverse shafts are rolled and extruded while being mutually extruded, so that the workpiece is finally rolled and formed;

and after forming, the rolling wheel dies on the two sides return, the upper male die is opened upwards, and the blank formed by rolling is kept on the lower female die.

According to another aspect of the present disclosure, a steel ring hub is provided, which is processed by using a planar plate as a raw material, and is obtained by the manufacturing method of the steel ring hub.

According to another aspect of the present disclosure, there is provided a processing mold for a steel ring hub, the processing mold including a drawing mold, the drawing mold adopting a counter-drawing structure, including:

a female die, the female die comprising:

the die comprises a die body, a die body and a die core, wherein the die body is provided with a concave part with a downward opening;

the pressing mechanism is arranged in the concave part and is used for pressing a planar metal plate to be processed; and

the terrace die, the terrace die set up in the die below includes:

the shape of the male die body is matched with the concave part of the female die body;

and the lower die fixing plate is used for fixing the male die body.

According to the embodiment of the disclosure, the female die body is further provided with a pressing mechanism accommodating space which is communicated with the concave part.

According to an embodiment of the present disclosure, the pressing mechanism includes:

the pressing block is arranged in the concave part, the first end of the pressing block faces the male die at the lower part, the horizontal plane of the concave part is exposed, and the second end of the pressing block is arranged in the holding space of the pressing mechanism; and

and the compression spring is arranged in the holding space of the compression mechanism, the first end of the compression spring is relatively fixed with the female die body, and the second end of the compression spring is connected with the compression block.

According to the embodiment of the disclosure, the positioning part is arranged at the upper part of the male die body and used for positioning the plane plate piece.

According to an embodiment of the present disclosure, the positioning portion is a raised step.

According to the embodiment of this disclosure, the mold processing still includes the roll forming die, the forming die includes:

the upper male die comprises a bulge matched with the shape of the inner surface of the hub finished part;

the female die is arranged below the upper male die and is provided with a groove matched with the shape of the outer surface of the hub finished part;

the rolling wheel dies are arranged on the side faces of the blank oppositely, the blank to be processed is extruded in the opposite direction and can roll along the side faces of the blank, and the side faces of the rolling wheel dies are matched with the side faces of the blank in shape and can move towards or away from the blank.

(III) advantageous effects

According to the technical scheme, the steel ring hub and the manufacturing method thereof have at least one of the following beneficial effects:

(1) the manufacturing method of the steel ring hub is simple in process, stable and universal and low in production cost;

(2) the steel ring hub produced by the method has higher strength than the existing steel ring hub, the strength of the steel ring is improved by integral heat treatment of a rolled blank after stretching, the integral forming of the steel ring is free of welding and heat treatment, the high strength of the steel ring hub is ensured, and the service life is longer;

(3) the concentricity accuracy of the steel ring after molding is high, and the concentricity of the outer circle of the steel ring and the hole site of the matched wheel shaft can be ensured because the steel ring is machined by once clamping after being integrally molded (without welding).

Drawings

Fig. 1 is a flow chart of a method for manufacturing a steel ring hub according to a first embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a drawing die of a steel ring hub in the embodiment of the present disclosure.

Fig. 3 is a schematic structural view of a roll forming die of a steel ring hub according to an embodiment of the present disclosure.

FIG. 4 is a flow chart of a steel ring hub manufacturing method according to a second embodiment of the present disclosure

Fig. 5 is a schematic structural view of a steel ring hub according to an embodiment of the present disclosure.

Fig. 6 is a schematic cross-sectional view of a steel ring hub according to an embodiment of the present disclosure.

[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure

100-stretching a mould; 110-a female die; 120-male die; 111-an upper die holder; 112-a female die body; 113-a hold down mechanism; 1131, pressing blocks; 1132 — a compression spring; 120-male die; 121-a lower die holder; 122-lower die fixing plate; 123-a male die body; 124-cylindrical step; 200-rolling and forming a mould; 210-a top punch; 220-lower concave die; 230-rolling wheel die; 300-a planar plate member; 400-blank.

Detailed Description

The invention provides a steel ring hub, a processing die and a manufacturing method thereof, wherein the manufacturing method of the steel ring hub comprises the following steps: determining the shape and size of a planar metal plate piece unfolded by the steel ring hub according to the required size of the formed steel ring hub, and performing cold cutting by adopting an integral metal plate piece material to obtain the planar metal plate piece; heating the planar metal plate to 800-900 ℃ or saponifying the surface of the planar metal plate, and then putting the planar metal plate into a stretching die for stretching and forming to obtain a preformed blank; sleeving the preformed blank into a rolling forming die, and repeatedly rolling the blank to obtain a rolling formed blank; carrying out heat treatment on the blank formed by rolling, including quenching and tempering treatment; and (3) performing cutting processing on the blank after the heat treatment to obtain a semi-finished product of the steel ring hub, and performing surface treatment and packaging on the semi-finished product to obtain a finished product as required.

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the disclosure are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In a first exemplary embodiment of the present disclosure, a method of manufacturing a steel ring hub is provided. The disclosed manufacturing method of steel ring hub is a manufacturing method of steel ring hub by using integral metal plate through cutting, heating and stretching, rolling and forming, heat treatment and machining.

Fig. 1 is a flowchart of a method for manufacturing a steel ring hub according to an embodiment of the present disclosure. As shown in fig. 1, the method for manufacturing a steel ring hub of the present disclosure includes:

and S1, cutting the sheet metal parts.

And determining the shape and size of a plane metal plate piece unfolded by the steel ring hub according to the required size of the formed steel ring hub, and performing cold cutting by adopting the whole metal plate piece material to obtain the cut plane metal plate piece.

And S2, heating and stretching.

Heating the cut flat plate to 800-900 deg.c, and stretching in a stretching mold to form pre-formed blank. Fig. 2 is a schematic structural diagram of a drawing die of a steel ring hub in the embodiment of the present disclosure. As shown in fig. 2, the drawing die 100 has a reverse drawing structure including a female die 110 and a male die 120, wherein the male die 120 is located at a lower position and the female die 110 is located at an upper position. The punch 120 has a cylindrical step 124 on which the flat sheet metal part is placed, and the die 110 has a recess that is in shape fit with the cylindrical step 124, and a pressing mechanism for pressing the flat sheet metal part is provided in the recess.

Specifically, the female die 110 includes an upper die holder 111, a female die body 112, and a pressing mechanism 113. The upper die holder 111 and the die body 112 are connected with each other, the die body 112 has a recessed portion with a downward opening, and the die body 112 further has a holding space for a pressing mechanism located between the upper die holder 111 and the recessed portion. The pressing mechanism 113 includes a pressing block 1131 and a pressing spring 1132, wherein the pressing block is disposed in the recessed portion, one end of the pressing block faces the lower part of the male mold 120, the horizontal surface of the recessed portion is exposed, and the other end of the pressing block is disposed in the pressing mechanism accommodating space and connected to the pressing spring 1132. The compression spring 1132 is disposed in the compression mechanism accommodating space, one end of the compression spring abuts against the upper die base, and the other end of the compression spring is connected to the compression block 1131.

The punch 121 includes a lower die holder 121, a lower die fixing plate 122, and a punch body 123. The lower die fixing plate 122 is fixed on the lower die holder 121, and the male die body 123 is disposed on the lower die fixing plate 122. The male die body 123 and the lower die fixing plate 122 are stepped and are matched with the concave part of the female die 110 in shape.

A through hole cylindrical hole is formed in the sheet metal material of the planar sheet metal part, and the cylindrical step of the male die 120 is used as a positioning reference. Illustratively, the female die 110 is provided with a cylindrical pressing block 1131, a compression spring 1132 is preloaded on the pressing block 1131, and the length of the pressing block 1131 is higher than the surface of the female die, i.e., the pressing block 1131 extends out of the concave part of the female die 110. In the process of pressing down the female die 110, the pressing block 1131 can press down the workpiece first, so that the planar metal plate does not deviate, the cylindrical step 124 enters the concave portion after the female die 110 is pressed down to press down the planar metal plate, and the female die 110 performs reverse stretch forming on the planar metal plate after the pressing down, so as to obtain a preformed blank.

And S3, rolling and forming.

The preformed blank is sleeved into a rolling forming die, the blank is repeatedly rolled to obtain a rolling formed blank, and the material internal part of the rolling formed blank is more compact in structure through repeated rolling, so that the product strength can be effectively improved. Preferably, the blank can be heated and then subjected to roll forming, so that the formed blank can improve the tightness of material molecules and reduce the deformation of subsequent heat treatment. Fig. 3 is a schematic structural view of a roll forming die of a steel ring hub according to an embodiment of the present disclosure. As shown in fig. 3, the rolling mold 200 includes three parts, i.e., an upper male mold 210, a lower female mold 220, and two rolling dies 230 of the same size.

Wherein the upper male die 210 comprises a protrusion matched with the shape of the inner surface of the finished hub part, and the lower female die 220 is arranged below the upper male die 210 and is provided with a groove matched with the shape of the outer surface of the finished hub part. The rolling wheel die 230 is arranged on the side surface of the blank, and the side surface of the rolling wheel die 230 is matched with the shape of the side surface of the blank and can move towards the direction close to or far away from the blank.

The upper punch 210 and the lower punch 220 are mutually extruded, in the relative extrusion process, the rolling wheel dies 230 on two sides roll the workpiece at the same time, the longitudinal and transverse shafts are mutually extruded and rolled, and finally the workpiece is formed by rolling. After forming, the rolling wheel molds 230 on the two sides are retracted, the upper male mold 210 is opened upwards, and the blank formed by rolling is retained on the lower female mold 220.

And S4, heat treatment.

And (3) putting the blank formed by rolling into a heat treatment multipurpose furnace for quenching and tempering, and improving the integral hardness and strength of the steel ring hub through heat treatment. The strength of the steel ring is improved through the integral heat treatment of the rolled blank after stretching, the integral forming of the steel ring is free of welding and the heat treatment ensures that the steel ring hub has high strength and longer service life.

And S5, machining.

And (3) removing the cutting of the blank after the heat treatment by using a lathe or a milling machine, so that the precision of some important dimensions of the steel ring hub and the precision requirement of each mounting hole position are improved. And performing surface treatment and packaging on the finished semi-finished product to obtain a finished product as required.

The manufacturing method of the steel ring hub has the advantages of simple process, stability, universality, low production cost, high precision of concentric coaxiality after the steel ring is formed, high strength of the produced steel ring hub compared with the existing steel ring, and longer service life.

In a second exemplary embodiment of the present disclosure, a method of manufacturing a steel ring hub is provided. The disclosed manufacturing method of steel ring hub is a manufacturing method of steel ring hub by using integral metal plate through metal plate cutting, cold drawing, rolling forming, heat treatment and machining.

Fig. 4 is a flowchart of a method for manufacturing a steel ring hub according to an embodiment of the present disclosure. As shown in fig. 4, the method for manufacturing a steel ring hub of the present disclosure includes:

and S1, cutting the sheet metal parts.

And S2, cold stretching.

And (3) performing saponification treatment on the surface of the cut planar sheet metal part, and then putting the sheet metal part into a drawing die for drawing and forming. Wherein the drawing die is the same as that of the first embodiment.

And S3, rolling and forming.

The preformed blank is sleeved into a rolling forming die, the blank is repeatedly rolled to obtain a rolling formed blank, and the material internal part of the rolling formed blank is more compact in structure through repeated rolling, so that the product strength can be effectively improved. Preferably, the blank can be heated and then subjected to roll forming, so that the formed blank can improve the tightness of material molecules and reduce the deformation of subsequent heat treatment. Wherein the roll forming die is the same as that of the first embodiment.

And S4, heat treatment.

And (3) putting the roll-formed blank into a heat treatment multipurpose furnace for quenching and tempering, and improving the overall hardness and strength of the steel ring hub through heat treatment.

And S5, machining.

In a third exemplary embodiment of the present disclosure, a steel ring hub is provided. Fig. 5 is a schematic structural view of a steel ring hub according to an embodiment of the present disclosure. Fig. 6 is a schematic cross-sectional view of a steel ring hub according to an embodiment of the present disclosure. The steel ring hub is obtained by taking a plane plate piece as a raw material and adopting the manufacturing method of the steel ring hub as the first embodiment or the second embodiment. The steel ring hub of this embodiment has following advantage compared with the prior art:

1. the steel ring hub of the embodiment of the disclosure adopts the plate pieces as raw materials, and the plate pieces are finished steel which is rolled after leaving a factory in a steel mill, and the chemical composition and the material density of the material are better.

2. The steel ring wheel hub of the embodiment of the present disclosure guarantees through hot stretching that the inside metal streamline of material does not produce the fracture to can improve the inside closely knit degree of material.

3. The steel ring wheel hub of the embodiment of the disclosure can ensure the integrity of the steel ring wheel hub through roll forming, thus no welding is needed, and the integral structure of the steel ring wheel hub is free of defects.

4. The current steel ring hub manufacturing process does not have the heat treatment process, because the steel ring after welding cannot be subjected to heat treatment again, cracks are generated, and therefore the process is not allowed. The steel ring hub adopts the metal plate as a raw material, can be subjected to a heat treatment process after a blank is formed, and can be subjected to integral heat treatment because welding is not adopted on the whole, so that the integral hardness and strength of the steel ring hub are improved.

5. And through subsequent machining, the precision and the air tightness of the steel ring hub are ensured in one step.

For the purpose of brief description, any technical features that can be applied to the same in the above embodiment 1 are described herein, and the same description need not be repeated.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.

It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.

And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.

In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A method of manufacturing a steel ring hub, comprising:

2. The method for manufacturing a steel ring hub according to claim 1, wherein the step of placing the steel ring hub into a stretching mold for stretching and forming to obtain a preformed blank comprises the following steps:

and after the plane metal plate part is tightly pressed, performing reverse stretching forming on the plane metal plate part through the concave die to obtain a preformed blank.

3. The method for manufacturing a steel ring hub according to claim 1, wherein the step of inserting the preformed blank into the rolling forming mold and repeatedly rolling the blank to obtain the rolling formed blank comprises:

4. A steel ring hub, characterized in that the steel ring hub is processed by taking a plane plate as a raw material, and is obtained by the manufacturing method of the steel ring hub according to any one of claims 1 to 3.

5. The machining die for the steel ring hub as claimed in claim 4, wherein the machining die comprises a drawing die (100), the drawing die (100) adopts a counter-drawing structure, and the machining die comprises:

a female die (110), the female die (110) comprising:

the die body (112), the die body (112) has the depressed part with the downward opening;

the pressing mechanism (113), the said pressing mechanism (113) is set up in the said dent, is used for pressing the flat panel plate to be processed; and

a male die (120), the male die (120) being disposed below the female die (110), comprising:

the shape of the male die body (123) is matched with the concave part of the female die body (112);

and the lower die fixing plate (122) is used for fixing the male die body (123).

6. The machining die for the steel ring hub according to claim 5, wherein the female die body (112) further comprises a pressing mechanism accommodating space, and the pressing mechanism accommodating space is communicated with the recess.

7. The machining die for the steel ring hub as claimed in claim 6, wherein the pressing mechanism (113) comprises:

the pressing block (1131) is arranged in the concave part, the first end of the pressing block (1131) faces towards the male die (120) at the lower part, the horizontal plane of the concave part is exposed, and the second end of the pressing block is arranged in the holding space of the pressing mechanism; and

and the compression spring (1132), the compression spring (1132) is arranged in a compression mechanism accommodating space, the first end is relatively fixed with the female die body (112), and the second end is connected with the compression block (1131).

8. The processing die for the steel ring hub as claimed in claim 5, wherein a positioning part is arranged at the upper part of the male die body (123) and used for positioning the plane plate.

9. The tooling die for steel ring hubs of claim 8 wherein said locating portion is a raised step.

10. The machining die of the steel ring hub as claimed in claim 5, further comprising a rolling forming die (200), wherein the rolling forming die (200) comprises:

an upper male die (210), wherein the upper male die (210) comprises a bulge which is matched with the shape of the inner surface of the hub finished part;

the lower female die (220) is arranged below the upper male die (210), and is provided with a groove matched with the outer surface shape of the hub finished part;

the rolling wheel dies (230) are arranged on the side faces of the blank oppositely, the blank to be processed is extruded in the opposite direction and can roll along the side faces of the blank, and the side faces of the rolling wheel dies (230) are matched with the side faces of the blank in shape and can move towards the direction close to or away from the blank.