CN214349377U

CN214349377U - VGR rack pendulum rolls process blank positioner

Info

Publication number: CN214349377U
Application number: CN202022640926.0U
Authority: CN
Inventors: 梁阿慧
Original assignee: TAICANG JIUXIN PRECISION MOLD CO Ltd
Current assignee: TAICANG JIUXIN PRECISION MOLD CO Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-10-08
Anticipated expiration: 2030-11-16

Abstract

The invention discloses a blank positioning device for a VGR rack rotary forging process, which comprises: the mould, the lower mould, be located the prefabricated blank of department in the middle of last mould and lower mould, install the lower bolster below the lower mould, wear to establish the lower mould ejector pin on lower mould and lower bolster, the lower slider that is located the lower bolster below, install lower mould ejector pin below and with wear to establish the lower mould ejector pin cushion that offsets of the board ejector pin on the lower slider, lower mould curved surface and lower mould locating plane restriction rather than complex curved surface and locating plane rotate, the device is through radial and axial fixed, prevent the product along with the mould swing at VGR rack forming in-process, can be at the make full use of material through using the device, guarantee under the prerequisite of product mechanical properties, improve product profile of tooth precision, stability and production efficiency.

Description

VGR rack pendulum rolls process blank positioner

Technical Field

The invention relates to the technical field of automobile accessory production, in particular to a blank positioning device for a VGR rack rotary forging process.

Background

The automobile steering system is a mechanism for changing or maintaining the running direction of an automobile, and ensures that the automobile can be steered and run according to the intention of a driver. Steering gear assemblies are an important component of automotive steering systems, and common steering gears include rack and pinion, worm crank pin, and recirculating ball. The rack and pinion steering gear is simple and compact in structure and high in transmission efficiency, and is used in automobiles more. The steering gear has high use frequency and complex working condition in the automobile running process, and is easy to generate abnormal sound. The abnormal sound generated in the process of meshing the steering gear and the steering rack is particularly obvious, and when the vibration frequency of the steering gear meshed with the steering rack is close to or equal to the self frequency of the steering gear assembly, the resonance is generated, and the abnormal sound is generated. The comfort of the user is influenced, and the quality of the whole vehicle is reduced.

The traditional rack of the automobile steering machine has constant transmission ratio, and the tooth-to-tooth distances are called CGR racks, and the traditional rack is generally manufactured by cutting machining methods such as tooth broaching or tooth milling. With the development of automobile technology, a variable transmission ratio steering engine is widely used abroad and is gradually applied domestically, and the pitch of a rack of the variable transmission ratio steering engine changes according to a transmission ratio curve, and the variable transmission ratio steering engine is called a VGR rack. At present, a variable pitch rack completely depends on import, in the domestic VGR rack process, blanks cannot be positioned in the process of pendulum rolling, so that the technical development of the pendulum rolling process is slow, and domestic racks of the existing steering engine are all CGR products and cannot meet the requirement of the variable transmission ratio of the steering engine.

In the process of developing a VGR rack rotary forging process, if a proper positioning structure of a blank and a die is not provided, the blank can swing along with a movable die, so that the problems that a tooth part cannot be smoothly filled, the tooth top is distorted, the tooth profile precision is low and the like are caused, and a qualified VGR rack product is difficult to obtain.

Disclosure of Invention

The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a blank positioning device for a VGR rack swing rolling process, the blank cannot swing along with a die when the blank is used for swing rolling of a VGR tooth shape, and the device improves the tooth shape precision, stability and production efficiency of a product on the premise of fully using materials and ensuring the mechanical property of the product.

The technical scheme is as follows: in order to achieve the above object, the present invention provides a blank positioning device for a VGR rack rotary forging process, comprising: go up the mould, be located the lower mould of last mould below, it still includes: the device comprises a prefabricated blank positioned between an upper die and a lower die, a lower die plate arranged below the lower die, a lower die ejector rod penetrating through the lower die and the lower die plate, a lower sliding block arranged below the lower die plate, and a lower die ejector rod cushion block arranged below the lower die ejector rod and abutted against a machine ejector rod penetrating through the lower sliding block, wherein a matching curved surface is radially arranged on the prefabricated blank;

the lower die is fixedly provided with a positioning cushion block, one end of the prefabricated blank abuts against the positioning cushion block, one end of the prefabricated blank abuts against or is separated from the movable cushion block to fix the prefabricated blank, and the two ends of the prefabricated blank are limited by the positioning cushion block and the movable cushion block to fix the axial position of the prefabricated blank.

As a further preferred aspect of the present invention, the movable cushion block is connected to a piston rod of the cylinder, when the prefabricated blank needs to be axially fixed, the positioning cushion block is fixed to the lower mold, the PLC circuit controls the piston rod of the cylinder to extend out, the movable cushion block connected to the piston rod abuts against the end of the prefabricated blank, so as to axially position the prefabricated blank, and when the pendulum mill process is completed and the product needs to be taken out, the PLC circuit controls the piston rod of the cylinder to reset, so that the movable cushion block is separated from the end of the prefabricated blank, and the product can be ejected out through the ejector rod.

As a further preferred aspect of the present invention, the lower mold curved surface and the lower mold positioning plane are respectively adapted to the shapes of the mating curved surface and the positioning plane.

As a further preferred aspect of the present invention, the curvature of the fitting curved surface is smaller than the curvature of the lower mold curved surface.

As a further preferred aspect of the present invention, the height of the positioning plane is not less than the lower mold positioning plane.

As a further preferred aspect of the present invention, the ratio of the height of the positioning plane to the diameter of the preform is 1: 10-1: and 5, the connection of the prefabricated blank placed into the lower die is more stable and reliable through the proportion, and the blank cannot swing along with the die when the blank is subjected to swing forging of the tooth form of the VGR.

In a further preferred embodiment of the present invention, the coating treatment in step three is a treatment step of immersing the preform subjected to the sand blasting treatment in a phosphating solution for 30 to 60 minutes to deposit a water-insoluble crystalline phosphate conversion coating on the surface of the preform.

As a further preferred aspect of the present invention, the lower mold is provided with a mold cavity for limiting the preform

As a further preferred aspect of the present invention, the upper mold has a tooth profile corresponding to the tooth profile of VGR.

As a further preferred aspect of the present invention, the upper mold and the lower slide are connected to a PLC circuit, respectively.

Has the advantages that: according to the blank positioning device in the VGR rack rotary forging process, the device prevents a product from swinging along with a die in the forming process of the VGR rack, and the tooth profile precision, the stability and the production efficiency of the product can be improved on the premise that materials are fully used and the mechanical property of the product is ensured.

Drawings

FIG. 1 is a schematic view of a preform;

FIG. 2 is an enlarged partial cross-sectional view of a preform;

FIG. 3 is a partial enlarged view of the lower die;

FIG. 4 is a front view of the working state before rotary forging;

FIG. 5 is a left side view of the working state before rotary forging;

fig. 6 is a schematic view of the working state after the rotary milling.

Detailed Description

The invention is further elucidated with reference to the drawings and the embodiments.

As shown in the attached drawings, the blank positioning device for the VGR rack rotary forging process comprises: an upper die 10, a lower die 20, a lower template 30, a lower die ejector rod 40, a lower die ejector rod cushion block 50, a lower slide block 80 and a machine bench ejector rod 90,

the lower die 20 is located below the upper die 10, the prefabricated blank 1 is located between the upper die 10 and the lower die 20, the lower die plate 30 is installed below the lower die 20, the lower die ejector rod 40 penetrates through the lower die 20 and the lower die plate 30, the lower sliding block 80 is located below the lower die plate 30, the lower die ejector rod cushion block 50 is installed below the lower die ejector rod 40 and abuts against a machine ejector rod 90 penetrating through the lower sliding block 80, the prefabricated blank 1 is radially provided with the matched curved surface 11, two ends of the matched curved surface 11 are provided with the positioning planes 12, the lower die 20 is provided with the lower die curved surface 21 and the lower die positioning plane 22, the lower die curved surface 21 and the lower die positioning plane 22 limit the rotation of the matched curved surface 11 and the positioning plane 12, the radial fixing of the prefabricated blank 1 is realized, and the axial fixing of the prefabricated blank 1 is realized by the positioning cushion blocks 60 and the movable cushion blocks 70 which limit two ends of the prefabricated blank 1.

Example 1

Step one, prefabricating a blank

Obtaining a prefabricated blank 1 by a forging and extruding mode, wherein the matching curved surface 11 and the positioning plane 12 on the prefabricated blank 1 are respectively matched with the shapes of the lower die curved surface 21 and the lower die positioning plane 22 on the lower die 20;

step two, sand blasting

After performing sand blasting on the prefabricated blank 1, performing sand blasting on the prefabricated blank 1 by using a sand blasting machine to remove oxide skin and attachments on the surface of the bar;

step three, involucra treatment

Performing a film treatment on the prefabricated blank 1 after the sand blasting treatment, wherein the film treatment is a treatment process of immersing the prefabricated blank 1 after the sand blasting treatment into phosphating solution for 30min and depositing a layer of water-insoluble crystalline phosphate conversion film on the surface of the prefabricated blank 1;

step four, rotary forging

Placing the precast blank 1 after the skin membrane treatment into a die cavity of a lower die 20, wherein the ratio of the height of the positioning plane 12 to the diameter of the precast blank 1 is 1: 5, the curved surface 21 of the lower die and the positioning plane 22 of the lower die limit the curved surface 11 and the positioning plane 12 which are matched with the curved surface to rotate, so that the radial positioning of the prefabricated blank 1 is realized, one end of the prefabricated blank 1 takes the positioning cushion block 60 as a datum plane and is abutted against the datum plane, and the other end of the prefabricated blank 1 is abutted against a movable cushion block 70 connected with a piston rod;

when the PLC circuit controls the lower sliding block 30 to drive the lower die 20 to move upwards, the upper die 10 receives a signal sent by the PLC circuit to start swinging until a sensor arranged on the upper die 10 senses that the upper die 10 contacts the prefabricated blank 1, the swinging and rolling forming starts, and the upper die 10 is provided with a tooth form corresponding to the tooth form of VGR;

after the upward travel of the lower slide block 30 reaches the height of the set value, the PLC circuit controls the upper die 10 to stop the rotary forging forming, and the surface of the prefabricated blank 1 is subjected to rotary forging to form the needed VGR tooth form, namely the finished product.

Step five, taking out

The piston rod connected with the cylinder drives the movable cushion block 70 to reset, the movable cushion block 70 is separated from the finished product, after the lower slide block 30 drives the lower die 20 to move downwards, the machine bench ejector rod 90 drives the lower die ejector rod cushion block 50 and the lower die ejector rod 40 to move towards the upper die 10 to eject the finished product.

Example 2

Step one, prefabricating a blank

step two, sand blasting

step three, involucra treatment

step four, rotary forging

Placing the precast blank 1 after the skin membrane treatment into a die cavity of a lower die 20, wherein the ratio of the height of the positioning plane 12 to the diameter of the precast blank 1 is 1: 10, the curved surface 21 of the lower die and the positioning plane 22 of the lower die limit the curved surface 11 and the positioning plane 12 which are matched with the curved surface to rotate, so that the radial positioning of the prefabricated blank 1 is realized, one end of the prefabricated blank 1 takes the positioning cushion block 60 as a datum plane and is abutted against the datum plane, and the other end of the prefabricated blank 1 is abutted against a movable cushion block 70 connected with a piston rod;

after the upward travel of the lower sliding block 30 reaches the height of a set value, the PLC circuit controls the upper die 10 to stop forming by rotary forging, and the surface of the prefabricated blank 1 is subjected to rotary forging to form a needed VGR tooth form, namely a finished product;

step five, taking out

The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A VGR rack pendulum rolls process blank positioner, it includes: go up mould (10), be located lower mould (20) of last mould (10) below, be located prefabricated blank (1) of department in the middle of last mould (10) and lower mould (20), install lower bolster (30) in lower mould (20) below, wear to establish lower mould ejector pin (40) on lower mould (20) and lower bolster (30), be located lower slider (80) of lower bolster (30) below, install lower mould ejector pin (40) below and with wear to establish lower mould ejector pin cushion (50) that board ejector pin (90) on lower slider (80) offset, its characterized in that: the prefabricated blank (1) is radially provided with a matching curved surface (11), two ends of the matching curved surface (11) are provided with positioning planes (12), the lower die (20) is provided with a lower die curved surface (21) and a lower die positioning plane (22), and the lower die curved surface (21) and the lower die positioning plane (22) limit the rotation of the curved surface (11) and the positioning plane (12) matched with the lower die curved surface and the lower die positioning plane;

and a positioning cushion block (60) is fixedly arranged on the lower die (20), one end of the prefabricated blank (1) is abutted against the positioning cushion block (60), and one end of the prefabricated blank (1) is abutted against or separated from a movable cushion block (70) to realize the fixation of the prefabricated blank (1).

2. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the movable cushion block (70) is connected with a piston rod of the air cylinder.

3. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the lower die curved surface (21) and the lower die positioning plane (22) are respectively matched with the shapes of the matching curved surface (11) and the positioning plane (12).

4. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the radian on the matching curved surface (11) is smaller than that on the lower die curved surface (21).

5. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the height of the positioning plane (12) is more than or equal to that of the lower die positioning plane (22).

6. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the ratio of the height of the positioning plane (12) to the diameter of the prefabricated blank (1) is 1: 10-1: 5.

7. the VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the upper die (10) is provided with a tooth form corresponding to the tooth form of VGR.

8. The VGR rack pendulum milling process blank positioner of claim 1, characterized in that: the upper die (10) and the lower die plate (30) are respectively connected with a PLC circuit.