CN108672512B

CN108672512B - Production process of motor car brake base and cold press molding die

Info

Publication number: CN108672512B
Application number: CN201810650646.2A
Authority: CN
Inventors: 蒋浩
Original assignee: Changshu Jinhua Mechanical Co ltd
Current assignee: Changshu Jinhua Mechanical Co ltd
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2023-06-16
Anticipated expiration: 2038-06-22
Also published as: CN108672512A

Abstract

The invention discloses a production process of a motor car brake base and a cold press molding die, wherein the die comprises the following components: the upper die, the punch, the base, the lower die and the ejector rod system are prefabricated according to the tooth profile requirement of the motor vehicle brake and are vertically fixed on the upper die, the base is fixed in the middle of the lower die, the prefabricated part of the motor vehicle brake base is placed in the die cavity of the lower die and is fixed on the base, and a plurality of ejector rod guide holes are formed in the bottom of the lower die. The ejector rod seat, the first ejector rods and the second ejector rods form an ejector rod system, the first ejector rods are responsible for lifting the whole lower die upwards to a working position, and the second ejector rods are responsible for ejecting prefabricated parts of the brake base of the motor car from the lower die. The process route comprises blank inspection, pretreatment, rough machining, clamping standard establishment, local cold extrusion molding, high-temperature tempering, finish machining and rust prevention. The invention improves the processing level of the tooth form precision of the inner end surface of the brake base, and has partially replaced the application of the foreign like products on motor cars.

Description

Production process of motor car brake base and cold press molding die

Technical Field

The invention relates to the field of high-speed rail part manufacturing, in particular to a production process of a motor car brake base and a cold press molding die.

Background

In recent years, the high-speed railway technology net wire is spread in China, the new history of mileage re-creation is a new business card which is communicated to the outside of China, along with the rapid development of high-speed railway, the related technology is also greatly improved, but the specific to detail aspects are also lacking, such as the motor car brake base mentioned today, because the severe requirements of the running environment of the high-speed railway are faced, the requirements on the processing precision and the strength are higher, and particularly, the general processing method with the high precision requirement of the tooth shape of the inner end face of the high-speed railway is also not met, and the requirements of the railway head company are not met when a plurality of companies are subjected to trial production, so the high-speed railway technology net wire can only be supplied by the foreign companies. To change this situation, I have performed a number of experiments based on re-integration of manufacturing process and mold design elements, ultimately resulting in a acceptable product. The product is accepted by related departments at present and is applied to high-speed rail motor train units.

Disclosure of Invention

The invention mainly solves the technical problem of providing a production process and a cold press molding die of a motor car brake base, which can ensure that the tooth shape in the end face of the produced motor car brake base meets the processing precision required by a drawing.

In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a motor car brake base cold press molding die, the cold press molding die comprising: the upper die, the punch, the base, the lower die and the ejector rod system; the punch is vertically fixed on the upper die, and the surface of the punch is prefabricated according to the tooth profile requirement of the inner end face of the motor car brake base; the base is fixed in the middle of the lower die, a prefabricated member of the motor car brake base is placed in a die cavity of the lower die and fixed on the base, and a plurality of ejector rod guide holes are formed in the bottom of the lower die; the ejector rod system comprises an ejector rod seat, a plurality of first ejector rods and a plurality of second ejector rods, one end of each first ejector rod is externally connected with a hydraulic ejection device, and the other end of each first ejector rod can be ejected upwards to the bottom of the lower die through an ejection limiting hole of the ejector rod seat and is responsible for lifting the whole lower die upwards to a working position and supporting action during extrusion; one end of the second ejector rod is fixed on the ejector rod seat, the other end of the second ejector rod stretches into the ejector rod guide hole, and the second ejector rod is responsible for ejecting the prefabricated member of the brake base from the lower die along the ejector rod guide hole after extrusion molding is completed.

In a preferred embodiment of the present invention, the number of the first ejector pins in the ejection system is one, and the number of the second ejector pins is two; one end of the first ejector rod is externally connected with a hydraulic ejection mechanism, and the other end of the first ejector rod can be ejected upwards to the bottom of the lower die through an ejection limiting hole in the middle of the ejection seat; the contact point of the first ejector rod and the lower die is positioned right below the extrusion end surface, and the contact point is in a straight line with the center point of the punch and the inner end surface of the brake; the ejection end surface of the first ejector rod is in a plane and the section of the inner end surface of the brake is in the same circle, and the diameter of the ejector rod end surface is not smaller than 0.9 time of the diameter of the inner section of the brake; the second ejector rods are uniformly distributed on two sides of the first ejector rod.

In a preferred embodiment of the present invention, a positioning column is used to fix the relative position between the base and the lower die.

In a preferred embodiment of the present invention, the driving force for the pressing and ejecting action is provided by an external hydraulic system.

In order to solve the technical problems, the invention adopts another technical scheme that: the production process of the motor car brake base is provided, the cold press molding die of the motor car brake base is used for cold press molding, and the production process specifically comprises the following steps: blank pre-inspection, blank pre-treatment, blank rough machining, clamping standard establishment, local cold extrusion molding, high-temperature tempering, finish machining and rust removal.

In a preferred embodiment of the invention, the extrusion step is subdivided into three stages of extrusion-dwell-cooling, each stage being maintained for at least more than 5 minutes, the three steps being cycled for at least more than 2 times.

In a preferred embodiment of the invention, the high temperature tempering temperature is between 550-600 ℃.

In a preferred embodiment of the present invention, the working process of the cold press forming die during extrusion forming is as follows: the first ejector rod is driven by an external oil pressure system to extend out of an ejection limiting hole in an ejector rod seat to the bottom of a lower die, then the die is slowly lifted to a corresponding working position, then the upper die is pressed down to drive a die punch to carry out extrusion molding, the upper die and the lower die are reset after extrusion is finished, and the motor car brake base is ejected out of the lower die through an ejection guide hole of the lower die by a second ejector rod.

The production process of the motor car brake base and the cold press molding die have the beneficial effects that:

1) The novel cold press forming die is adopted for cold extrusion process manufacturing, the novel process only carries out cold extrusion forming on the inner end face, the tonnage of a used press is reduced compared with that of integral extrusion forming of parts, the front and back processing procedures are not influenced, and the integral processing difficulty is reduced.

2) The novel cold press molding die structure reduces the extrusion stroke of the punch by using the whole lifting of the ejector rod system, and improves the stability and the precision during extrusion.

According to the cold press molding die for the motor car brake base and the production process thereof, disclosed by the invention, the difficulty in high-precision tooth-shaped processing of the inner end surface of the motor car brake is solved by comprehensively considering the die factors and the process factors, the localization of the part is realized, and a good social effect is achieved.

Drawings

FIG. 1 is a schematic view showing the overall structure of a cold press molding die for a brake base of a motor car according to a preferred embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a brake base preform;

FIG. 3 is a schematic top view of the brake base preform shown in FIG. 2 prior to extrusion;

FIG. 4 is a schematic top view of the brake base preform shown in FIG. 3 after extrusion

FIG. 5 is a schematic cross-sectional view of the lower die shown in FIG. 1;

FIG. 6 is a schematic top view of the lower die shown in FIG. 1

FIG. 7 is a schematic top view of the ejector pin seat shown in FIG. 1

Fig. 8 is a front view of a positioning post between the base and the lower die shown in fig. 1.

The components in the drawings are marked as follows:

1. the brake comprises an upper die, a punch, a part (brake base), a base, a lower die, a second ejector rod, an ejector rod base, a first ejector rod, a positioning column, an ejection guide hole, a base fixing position, a die cavity wall, a first ejector rod ejection limiting hole and a second ejector rod positioning hole, wherein the upper die, the punch and the part (brake base), the base, the lower die, the second ejector rod, the ejector rod base, the first ejector rod, the positioning column, the ejection guide hole, the base fixing position, the die cavity wall, the first ejector rod ejection limiting hole and the second ejector rod positioning hole.

Detailed Description

0026. The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.

0027. Referring to fig. 1-8, an embodiment of the present invention includes:

0028. a motor car stopper base cold press molding die, the motor car stopper base cold press molding die comprising: the device comprises an upper die, a punch, a base, a lower die and a push rod system. The punch is vertically fixed on the upper die, and the surface of the punch is prefabricated according to the tooth profile requirement of the inner end face of the brake base of the motor car. The base is fixed in the middle of the lower die, the prefabricated member of the motor car brake base is placed in the die cavity of the lower die and fixed on the base, and a plurality of ejector rod guide holes are formed in the bottom of the lower die. The ejector rod system comprises an ejector rod seat, a plurality of first ejector rods and a plurality of second ejector rods, one end of each first ejector rod is externally connected with a hydraulic ejection device, and the other end of each first ejector rod can be ejected upwards to the bottom of the lower die through an ejection limiting hole of the ejector rod seat; one end of the second ejector rod is fixed on the ejector rod seat, and the other end of the second ejector rod extends into the ejector rod guide hole.

0029. The upper die 1 is placed on an upper working platform during operation, the upper die punch 2 prefabricated according to the tooth form of the inner end surface of the part 3 is vertically fixed on the upper die 1, a positioning hole is formed in the middle of the base 4, and a positioning column 9 is inserted into the positioning hole to fix the relative position between the base 4 and the lower die 5, so that the coaxial precision of the part 3 during extrusion is ensured. The ejector rod system consists of two second ejector rods 6, a first ejector rod 8 and an ejector rod seat 7. The end face of the first ejector rod 8 and the section of the end face to be processed of the part 3 are the same circular shape, the diameter is 0.9 times of the diameter, so that the whole stress of the inner end face of the part 3 in the extrusion process is stable and uniform, the tooth form precision is prevented from being damaged, the first ejector rod 8 can be ejected out through the ejection limiting hole 13 in the middle of the ejector rod seat 7 to be in contact with the bottom of the lower die 5, and the contact point of the first ejector rod 8 and the lower die 5, the central point of the inner end face of the part 3 and the central point 3 of the punch 2 form a straight line. So as to ensure that the inner end surface of the part 3 is uniformly stressed in the extrusion process and further improve the extrusion tooth form precision. The second ejector rods 6 are uniformly distributed on two sides of the first ejector rod 8. The driving force of the upper die 1 and the ejector rod system is provided by an external oil pressure mechanism.

0030. The invention relates to a production process of a motor car brake base, which comprises the following specific steps:

0031.1 Pre-inspecting the blank, and pre-treating the blank after confirming the material, wherein the pre-treating method is a method which can improve the processing performance of the blank, such as spheroidizing annealing.

0032.2 Cutting and rough machining is carried out on the blank, the rough outline of the part is machined, and an accurate die clamping reference is machined, so that the follow-up die clamping treatment is facilitated.

0033.3 Local cold extrusion molding, the specific actions are as follows: firstly, tightly attaching and clamping a prefabricated part 3 with a die cavity wall 12 of a lower die 5 at a clamping reference position, wherein a bottom cavity of the prefabricated part 3 is clamped on a base 4 in the middle of the die cavity and fixed, and a positioning column 9 is arranged between the base 4 and the lower die 5; then the first ejector rod 8 is ejected upwards from the ejection limiting hole 13 to the bottom of the lower die 5 under the action of an external hydraulic system, the lower die 5 is lifted to a preset working position, and then the first ejector rod 8 is kept motionless; then the upper die 1 drives the upper die punch 2 to press downwards under the action of a hydraulic system, the punch 2 extrudes the inner end face of the part 3 to be processed and maintains pressure, then the upper die 1 resets, the part 3 is kept still for a period of time and then continues to extrude-maintain pressure-keep still, each step is 5min, and the process is circulated for three times, so that the influence of plastic rebound of extruded materials on the precision of tooth profile molding is reduced. After the extrusion forming action is completed, the first ejector rod 8 is reset to the initial position, and then the second ejector rod 6 ejects the extruded part 3 along the ejection guide hole 10 at the bottom of the lower die 5.

0034.4 High temperature tempering, the tempering temperature is kept between 550 ℃ and 600 ℃, and the purpose of the procedure is to release stress accumulated at the extrusion boundary of the part caused by partial cold extrusion, so as to improve the mechanical property and the service life of the part.

0035.5 Finish machining is carried out on the surface of the part 3, so that the surface smoothness is improved.

0036.6 Finally, carrying out rust prevention treatment on the part 3.

0037. The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. The utility model provides a motor car stopper base cold press molding mould which characterized in that, motor car stopper base cold press molding mould includes: the upper die, the punch, the base, the lower die and the ejector rod system; the punch is vertically fixed on the upper die, and the surface of the punch is prefabricated according to the tooth profile requirement of the inner end face of the motor car brake base;

the base is fixed in the middle of the lower die, a prefabricated member of the motor car brake base is placed into a die cavity of the lower die before extrusion and is fixed on the base, and a plurality of ejector rod guide holes are formed in the bottom of the lower die; the ejector rod system comprises an ejector rod seat, a plurality of first ejector rods and a plurality of second ejector rods, one end of each first ejector rod is externally connected with a hydraulic ejection mechanism, and the other end of each first ejector rod can be ejected upwards to the bottom of the lower die through an ejection limiting hole of the ejector rod seat and is responsible for lifting the whole lower die upwards to a working position; one end of the second ejector rod is fixed on the ejector rod seat, the other end of the second ejector rod extends into the ejector rod guide hole on the lower die, and the second ejector rod is responsible for ejecting the prefabricated member of the brake base from the lower die along the ejector rod guide hole after extrusion molding is completed;

the first ejector rods in charge of lifting and supporting in the ejection system are one, and the second ejector rods are two;

one end of the first ejector rod is externally connected with a hydraulic ejection mechanism, and the other end of the first ejector rod can be ejected upwards to the bottom of the lower die through an ejection limiting hole in the middle of the ejection seat; the contact point of the first ejector rod and the lower die is positioned right below the extrusion end surface, and the contact point is in a straight line with the center point of the punch and the inner end surface of the brake; the ejection end surface of the first ejector rod is in a plane and the cross section of the inner end surface of the brake is in the same circle, and the diameter of the end surface of the first ejector rod is not smaller than 0.9 time of the diameter of the inner cross section of the brake; the second ejector rods are uniformly distributed on two sides of the first ejector rod;

and a positioning column is adopted between the base and the lower die to fix the relative position.

2. The motor car brake base cold press molding die of claim 1, wherein the driving force for the extrusion and ejection actions is provided by an external hydraulic system.

3. A production process of a motor car brake base, which is characterized by using the motor car brake base cold press molding die as claimed in any one of claims 1-2 to perform cold press molding, comprising the following specific steps: blank pre-inspection, blank pre-treatment, blank rough machining, clamping standard establishment, local cold extrusion molding, high-temperature tempering, finish machining and rust removal.

4. A process for producing a motor vehicle brake foundation according to claim 3, wherein the extrusion step is subdivided into three stages of extrusion-dwell-cooling, each stage being maintained for at least more than 5 minutes, the three steps being cycled for at least more than 2 times.

5. A process for producing a motor car brake foundation according to claim 3, characterized in that the high temperature tempering temperature is between 550-600 ℃.

6. A process for producing a motor car brake base according to claim 3, wherein the cold press forming die works as follows: the first ejector rod is driven by an external oil pressure system to extend out of an ejection limiting hole in an ejector rod seat to the bottom of a lower die, then the die is slowly lifted to a corresponding working position, then the upper die is pressed down to drive a die punch to carry out extrusion molding, the upper die and the lower die are reset after extrusion is finished, and the motor car brake base is ejected out of the lower die through an ejection guide hole of the lower die by a second ejector rod.