A tire production forming die and a tire blank manufacturing process

Abstract

The present application relates to the field of wheel rim rolling, in particular to a wheel rim production forming die and a wheel rim blanking process, comprising a die table, a nest is arranged on the die table, the nest comprises a nest body, a forming sink is arranged on the nest body; the forming sink forms a bottom plane on the nest body; the bottom plane is connected with a side surface; the side surface is connected with the bottom plane through an arc connecting surface; the present application discloses a wheel rim production forming die, the cooperation of the die table and the nest guarantees the stability of the nest arrangement, avoids the transverse deflection of the nest along the die table, in addition, the forming sink is arranged on the nest in the present application, which facilitates the blank forming, meanwhile, the arc connecting surface is adopted between the side surface and the bottom plane in the forming sink of the present application; the metal outflow is facilitated, the folding problem of the blank due to the edge at the connecting position of the side surface and the bottom plane is avoided, meanwhile, the side surface is also an arc surface.

Description

Technical Field

[0001] This invention relates to the field of wheel rim rolling, specifically to a wheel rim production forming mold and a wheel rim blanking process. Background Technology

[0002] The original process design for hydraulic press wheel hoop blank making has the following specific issues:

[0003] ① The process involves many steps, significant temperature differences, and poor metal fluidity, resulting in numerous defective products such as folded, incompletely filled, and dented rolled billets, with a product qualification rate of only 93.03%.

[0004] Furthermore, the selling price of this type of product is approximately 13,000 yuan per ton, resulting in significant cost losses.

[0005] ② The pace is slow, the production efficiency is low, the time for a single blank is about 150 seconds, and the electricity and energy consumption costs increase;

[0006] ③ There are many job positions, many people involved in manufacturing, and high personnel costs.

[0007] Meanwhile, the existing molds used for rolling blanks have many sharp edges, which leads to unreasonable metal distribution during actual production, resulting in a large number of defective products such as folded, incomplete, and dented rolled blanks.

[0008] Therefore, it is necessary to optimize the existing process flow and mold design to reduce the number of steps and improve quality and efficiency.

[0009] A search revealed that existing patent 201420522572.1 - Hoop Bending Mold - also cannot solve the above problem. Summary of the Invention

[0010] The purpose of this invention is to provide a forming die that improves the rolling shape of billets.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] A wheel rim manufacturing mold includes a mold platform with a nested part on the mold platform. The nested part includes a nested body with a forming groove on the nested body. The forming groove forms a bottom plane on the nested body. The bottom plane is connected to a side surface. The side surface and the bottom plane are connected by an arc connecting surface.

[0013] The side surface is also curved.

[0014] A limiting part is provided between the mold platform and the nesting body. The limiting part includes a positioning groove on the mold platform and an annular groove on the nesting body. The annular groove forms a positioning protrusion on the nesting body. The nesting body is placed in the positioning groove of the mold platform through the positioning protrusion.

[0015] The depth of the molded sink is less than the height of the nested body.

[0016] The circumferential groove is a rectangular groove; the nested body fits into the inner wall of the positioning sink and the upper surface of the mold through the rectangular groove.

[0017] The horizontal projected area of ​​the positioning protrusion is greater than the horizontal projected area of ​​the forming sink; the plane on which the inner side of the circumferential groove is located is misaligned with the longitudinal plane at the outermost edge of the forming sink.

[0018] A wheel rim blanking process; the wheel rim blanking process requires wheel rim production equipment;

[0019] The wheel rim production equipment includes a hydraulic press, which is equipped with a worktable;

[0020] The workbench is equipped with a wheel rim production forming mold;

[0021] The blank-making process includes the following steps:

[0022] Step 1: Loading; The heated blank is placed into the forming mold on the hydraulic press worktable by the heating furnace robot.

[0023] Step 2: Upsetting; The billet is upset using a hydraulic press to control the billet height;

[0024] Step 3: Pre-punching; Pre-punching holes are machined into the blank using a hydraulic press pre-punching head;

[0025] Step 4: Leveling; Level the upper surface of the blank using a hydraulic press;

[0026] Step 5: Final punching: The blank is punched to its final position using a hydraulic press;

[0027] Step 6: Rolling, the billet is rolled using a rolling mill.

[0028] The rolling process in step 6 is performed using a large ring mill.

[0029] Step 2 requires upsetting the billet on a workbench.

[0030] The size of the pre-punch used in step 3 must be larger than the size of the final punch used in step 6.

[0031] The advantages of this invention are:

[0032] This invention discloses a wheel rim production forming mold. The mold platform and nesting mechanism ensure the stability of the nesting arrangement and prevent lateral deflection of the nesting along the mold platform. Furthermore, the nesting features a forming groove, facilitating blank forming. The side and bottom planes of the forming groove are connected by an arc-shaped surface, facilitating metal outflow and preventing blank folding due to the edges at the connection point. The side plane is also arc-shaped. Based on this design, the pre-punching process allows for unrestricted metal flow under arc guidance during the pre-punching process. The arc transition reduces the gradient of blank height changes, and the blank tread surface has no slope, eliminating the risk of folding caused by a large amount of metal flowing upwards during the rolling process. Attached Figure Description

[0033] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0034] Figure 1 This is a schematic diagram of the structure of the present invention.

[0035] The markings in the above figures are all:

[0036] 1. Nesting, 11. Nested body, 12. Molding groove, 121. Bottom plane, 122. Side, 123. Arc connecting surface, 2. Mold table, 21. Positioning groove. Detailed Implementation

[0037] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0038] A wheel rim manufacturing mold includes a mold platform 2, on which a nest 1 is provided. The nest 1 includes a nest body 11, on which a forming groove 12 is provided. The forming groove 12 forms a bottom plane 121 on the nest body 11. The bottom plane 121 is connected to a side surface 122. The side surface 122 and the bottom plane 121 are connected by an arc connecting surface 123. This invention discloses a wheel rim manufacturing mold. Through the cooperation between the mold platform 2 and the nest 1, this invention ensures the stability of the nest 1 arrangement and avoids lateral deflection of the nest 1 along the mold platform 2. In addition, in this invention, the nest 1... The forming groove 12 is provided to facilitate the forming of the billet. At the same time, the side surface 122 and the bottom plane 121 of the forming groove 12 are connected by an arc connecting surface 123, which facilitates the outward flow of metal and avoids the billet from folding due to the edge of the connection between the side surface 122 and the bottom plane 121. Meanwhile, the side surface 122 is also an arc surface. Based on the above design, the metal flows outward without constraint under the guidance of the arc during the pre-punching process of the billet. The arc transition reduces the gradient of the billet height change. At the same time, the billet tread surface has no slope, eliminating the cause of folding caused by a large amount of metal flowing upward on the tread surface during the rolling process.

[0039] Specifically, the forming mold disclosed in this invention is mainly used for stamping and forming blanks, facilitating the subsequent formation of wheel rims. The forming mold is primarily used in conjunction with a hydraulic press, and in actual setup, it is placed on the worktable of the hydraulic press. In this invention, the forming mold mainly includes a mold table 2, which serves as a base placement platform. In actual setup, the mold table 2 is placed on the worktable. Additionally, a nesting 1 is provided on the mold table 2, comprising a nesting body 11, which is placed on the mold table 2 and supported by the mold table 2. Furthermore, the nesting body 11 in this invention is provided with a forming groove 12. The forming groove 12 facilitates the placement of the blank during upsetting and pre-forming. Under the action of the punching process, the blank is pre-formed. In addition, in this invention, the forming groove 12 forms a bottom plane 121 on the nested body 11; the bottom plane 121 is connected to the side plane 122; the side plane 122 and the bottom plane 121 are connected by an arc connecting surface 123; the side plane 122 is also an arc-shaped surface. By setting the arc connecting surface 123, this invention avoids the formation of sharp corners at the connection between the bottom plane 121 and the side plane 122. At the same time, based on the fact that the side plane 122 is also an arc-shaped surface, this invention can eliminate the traditional blank tread folding, greatly improving production efficiency. At the same time, the setting of the arc-shaped surface can prevent the nested body 1 from being pushed up by the blank and affecting the blank forming operation.

[0040] Based on the above design, when in use, the pre-punching and pressing process of the billet is unrestrained when the metal flows outward under the guidance of the arc. The arc transition reduces the gradient of the billet height change, and at the same time, the billet tread has no slope, eliminating the cause of folding caused by a large amount of metal flowing upward on the tread during the rolling process.

[0041] Furthermore, in this invention, a limiting part is provided between the mold platform 2 and the nest 1. The limiting part plays a good limiting role, ensuring the mutual positioning between the mold platform 2 and the nest 1 and preventing the nest 1 from shifting. At the same time, the nest 11 of this invention has a bowl-shaped structure. During blank processing, the blank also applies longitudinal extrusion force to the nest 1, thereby better ensuring the stability of the arrangement between the nest 1 and the mold platform 2. In addition, the limiting part in this invention includes a positioning groove 21 provided on the mold platform 2 and an annular groove 13 provided on the nest 11. The annular groove 13 forms a positioning protrusion 111 on the nest 11. The nest 11 is placed in the positioning groove 21 of the mold platform 2 through the positioning protrusion 111. In this invention, the positioning protrusion 111 is inserted into the positioning groove 21, so that the nest 1 and the mold platform 2 are connected. The positioning protrusion 111 is inserted into the positioning groove 21, thereby preventing the nest 1 from shifting laterally off the mold platform 2, thus ensuring the stability of the lateral arrangement of the nest 1 and the mold platform 2.

[0042] Furthermore, in this invention, the depth of the forming groove 12 is less than the height of the nest 11. Through this arrangement, the forming groove 12 is not a through-groove structure. In actual arrangement, the blank is placed inside the nest 1. This arrangement ensures that the nest 1 is also subjected to longitudinal extrusion force of the blank during blank processing, thereby preventing the blank from lifting the nest 1 and affecting subsequent blank processing operations.

[0043] Furthermore, in this invention, the annular groove 13 is a rectangular groove; the nested body 11 fits into the inner wall of the positioning groove 21 and the upper surface of the mold table 2 through the rectangular groove; through the above design, this invention greatly ensures the fitting area between the nested body 1 and the mold table 2, and effectively ensures the connection area between the nested body 1 and the mold table 2.

[0044] Furthermore, in this invention, the horizontal projected area of ​​the positioning protrusion 111 is greater than the horizontal projected area of ​​the forming sink 12; the plane on which the inner side surface 122 of the annular groove 13 is located is misaligned with the longitudinal plane at the outermost edge of the forming sink 12; through this design, the annular groove 13 is not directly below the forming sink 12, and this setting can better distribute the force on the nest 1 and increase the service life of the nest 1.

[0045] A wheel rim blanking process; the wheel rim blanking process requires wheel rim production equipment;

[0046] The wheel rim production equipment includes a hydraulic press, which is equipped with a worktable;

[0047] The workbench is equipped with the wheel rim production molding die;

[0048] The blank-making process includes the following steps:

[0049] Step 1: Loading; The heated blank is placed into the forming mold on the hydraulic press worktable by the heating furnace robot.

[0050] Step 2: Upsetting; The billet is upset using a hydraulic press to control the billet height;

[0051] Step 3: Pre-punching; Pre-punching holes are machined into the blank using a hydraulic press pre-punching head;

[0052] Step 4: Leveling; Level the upper surface of the blank using a hydraulic press;

[0053] Step 5: Final punching: The blank is punched to its final position using a hydraulic press;

[0054] Step 6: Rolling, the billet is rolled using a rolling mill.

[0055] The present invention simplifies the process of wheel rim blank making by the above-mentioned blank making process, reduces the number of positions, and correspondingly reduces the number of on-the-job personnel or assistants; thus greatly reducing the input of labor costs.

[0056] Furthermore, in step 6 of this invention, a large-ring mill is used for rolling. This invention can reduce the traditional two-pass rolling process to a single-pass rolling process by using a large-ring mill, which greatly improves production efficiency. In addition, using a large-ring mill to roll the billet can increase the stability of the rolling process.

[0057] Furthermore, in step 2 of this invention, the upsetting operation of the billet is required to be carried out on a workbench; through such limitation, this invention greatly reduces the forging steps, improves the cycle time, reduces the forging temperature drop, and is more conducive to rolling forming.

[0058] Furthermore, in this invention, the size of the pre-punch used in step 3 is required to be larger than the size of the final punch used in step 6. By designing the punch in this way, the large punch provides ample allowance for the change of the inner hole after pre-punching, which can provide more flatness for the pre-punched billet, making the billet shape more diffuse and more conducive to filling the nested cavity 1.

[0059] specific;

[0060] This invention discloses a wheel rim production forming mold and a wheel rim blanking process. Specifically, this invention designs a new forming mold and adopts a reasonable mold cavity design to replace the function of the sizing ring, obtaining a formed blank that meets the rolling process requirements through one upsetting process. This reduces the number of forging steps, improves the cycle time, reduces the forging temperature drop, and is more conducive to rolling forming. In addition, in this invention, the forming mold is more conducive to rolling forming and reduces the occurrence of rolling defects such as folding.

[0061] Specifically, the forming mold disclosed in this invention uses the shape of the mold surface to guide the flow and deformation of the metal, and rationally distributes the metal to provide the blank required for rolling. Through process reengineering, the working steps of the hydraulic press are reduced, the blanking efficiency and blanking quality are improved, and the manufacturing cost is reduced by eliminating old line equipment and reducing maintenance costs.

[0062] Meanwhile, by optimizing the upsetting process, the process flow is simplified, reducing positions and consequently reducing the number of on-the-job or auxiliary personnel; excessive old equipment can be removed, providing space for subsequent production line upgrades; removing old equipment reduces oil sludge pollution, dust pollution, and noise pollution; thus providing strong support for the company's environmental protection and carbon reduction efforts.

[0063] The optimization of the upsetting process in this invention is based on the provision of the aforementioned forming mold.

[0064] In this invention, a reasonable mold cavity (forming groove 12) design is adopted to replace the function of the sizing ring, and a forming blank that meets the rolling process requirements is obtained through one upsetting forming.

[0065] New process flow: feeding, upsetting, pre-punching, leveling, final punching, rolling.

[0066] In this billet pre-punching process, the metal flows outward unrestrained under the guidance of the arc. The arc transition reduces the gradient of billet height change, and the billet tread has no slope, eliminating the cause of folding due to a large amount of metal flowing upward on the tread during the rolling process.

[0067] By reengineering the process and reducing the number of steps in the hydraulic press, the billet preparation time was reduced from about 150 seconds to 100 seconds, increasing efficiency by 33% and improving the rolling qualification rate by nearly 5 percentage points.

[0068] In this invention, the forming mold mainly includes: a nest 1 and a mold platform 2. The nest 1 is fixed inside the mold platform 2. The mold platform 2 is provided with a positioning groove 21, and the nest 1 is arranged in the positioning groove 21. The product rolling shape design of the positioning groove 21 is blank to ensure reasonable distribution of rim surface and outer diameter metal, and to achieve smooth demolding. At the same time, the bottom of the mold platform 2 and the nest 1 are fixed by a stop to prevent the nest 11 from sliding relative to the mold platform 2.

[0069] During implementation, the billet is placed in the forming sink 12 of the nested 1, and after upsetting, pre-punching, and leveling, it is transported to the punching platform for punching, thereby completing the metal billet making.

[0070] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A wheel rim blanking process, characterized in that: Wheel rim production equipment is required when preparing the wheel rim blank; The wheel rim production equipment includes a hydraulic press, which is equipped with a worktable; The workbench is equipped with a wheel rim production forming mold; The wheel rim production molding die includes a mold platform, on which a nest is provided. The nest includes a nest body, and the nest body is provided with a forming groove. The forming groove forms a bottom plane on the nest body. The bottom plane is connected to a side surface. The side surface and the bottom plane are connected by an arc connecting surface. The side surface is also curved; A limiting part is provided between the mold platform and the nesting body. The limiting part includes a positioning groove provided on the mold platform and an annular groove provided on the nesting body. The annular groove forms a positioning protrusion on the nesting body. The nesting body is placed in the positioning groove of the mold platform through the positioning protrusion. The horizontal projected area of ​​the positioning protrusion is larger than the horizontal projected area of ​​the forming groove; the plane on which the inner side of the circumferential groove is located is misaligned with the longitudinal plane at the outermost edge of the forming groove. The blank-making process includes the following steps: Step 1: Loading; The heated blank is placed into the forming mold on the hydraulic press worktable by the heating furnace robot. Step 2: Upsetting; The billet is upset using a hydraulic press to control the billet height; Step 3: Pre-punching; Pre-punching holes are machined into the blank using a hydraulic press pre-punching head; Step 4: Leveling; Level the upper surface of the blank using a hydraulic press; Step 5: Final punching: The blank is punched to its final position using a hydraulic press; Step 6: Rolling, the billet is rolled using a rolling mill; The size of the pre-punch used in step 3 is larger than the size of the final punch used in step 5; The billet is placed in a nested forming trough for upsetting, pre-punching, and leveling.

2. The wheel rim blanking process according to claim 1, characterized in that, The depth of the molded sink is less than the height of the nested body.

3. The wheel rim blanking process according to claim 1, characterized in that, The circumferential groove is a rectangular groove; the nested body fits into the inner wall of the positioning sink and the upper surface of the mold through the rectangular groove.

4. The wheel rim blanking process according to claim 1, characterized in that, The rolling process in step 6 is performed using a large ring mill.

5. The wheel rim blanking process according to claim 1, characterized in that, In step 2, the upsetting operation of the billet is performed on a workbench.

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