CN111250939B

CN111250939B - A kind of transfer needle sheet production process

Info

Publication number: CN111250939B
Application number: CN202010201710.6A
Authority: CN
Inventors: 陈�峰; 张炜; 陈光明
Original assignee: Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Current assignee: Hangzhou Yujiang Intelligent Technology Co ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2021-03-19
Anticipated expiration: 2040-03-20
Also published as: CN111250939A

Abstract

The invention discloses a process for producing a transfer piece, which belongs to the technical field of processing parts of a computerized flat knitting machine. The traditional transfer sheet production process has problems such as insufficient wear resistance and poor toughness, which shorten the service life of the knitting needle and the stability of the equipment. The processing technology of the invention re-optimizes the material of the transfer sheet, selects T10 alloy steel with better properties, and performs multiple heat treatments on the blank, which reduces the deformation of the blank and refines the metal internal metal. Phase structure to further eliminate internal stress, and finally through the correction treatment and coating treatment of the working part, the accuracy, toughness and appearance quality of the transfer sheet have been greatly improved, the service life of the transfer sheet has been prolonged, and the product quality has been improved. Economic value, to a certain extent, provides a basis for the subsequent quality improvement of knitted products.

Description

Needle turning sheet production process

Technical Field

The invention belongs to the technical field of processing of parts of a computerized flat knitting machine, and particularly relates to a production process of a needle turning piece on a knitting needle.

Background

The knitting needle is one of important parts of a knitting mechanism on a computerized flat knitting machine and is mainly used for finishing related actions such as loop-forming knitting, tuck knitting, needle turning action and non-knitting. The knitting needle mainly comprises a needle body and a needle turning sheet, and when the knitting needle works, a coil is discharged from the knitting needle in one direction to the needle turning height, and the coil falls on the needle turning sheet in the knitting needle. Meanwhile, the knitting needle at the corresponding position of the other needle bed is withdrawn to the height of the needle receiving. The needle hook of the connecting needle is inserted into the needle turning sheet of the knitting needle to make the needle fall back, the needle of the connecting needle obtains a loop, and the loop on the needle at the corresponding position of the front bed and the back bed moves. In the action process, the quality of the needle turning sheet is directly related to the service life of the knitting needle and the production efficiency of the equipment.

At present, the stitch-over sheet production process in the market basically adopts a T8 alloy steel strip to punch and form a finished product through one-time heat treatment and appearance grinding and polishing treatment, but the stitch-over sheet produced by the process has the problems of insufficient wear resistance, poor toughness and the like, and the service life of a knitting needle and the stability of equipment are shortened; secondly, in the production process of the stitch-bonding sheet, the stitch-bonding sheet is relatively fine and thin, so that the deformation is large in the heat treatment process, and once the stitch-bonding sheet is deformed, the stitch-bonding sheet cannot be repaired, the qualification rate of products is reduced, and the production cost of enterprises is improved.

Disclosure of Invention

The invention aims to overcome the technical problems in the background technology and provide a production process of the stitch-over sheet, which has high precision, good appearance consistency and toughness and long service life.

Therefore, the invention adopts the following technical scheme: the stitch-bonding piece production process is characterized by comprising the following steps:

1) blank preliminary heat treatment: cutting a coiled strip-shaped T10 blank into strip-shaped blanks with each length of 1000mm, then clamping and fixing 5 strip-shaped blanks in a group by using a special clamp, and putting the blanks into an electric furnace for preliminary heat treatment, wherein the preliminary heat treatment is normalizing treatment, the normalizing treatment temperature is kept at 770-790 ℃, and the heat preservation time is 12-15 min; then, carrying out high-temperature tempering on the blank, wherein the high-temperature tempering temperature is 550-650 ℃, preserving the heat for 3-5 min, and then cooling the blank to room temperature in static air, so as to eliminate the stress generated during normalizing cooling and improve the toughness and plasticity;

2) spreading the blank after the preliminary heat treatment, placing the blank in a special grinding fixture, grinding two planes on a surface grinding machine through a brown corundum grinding wheel with the abrasive grain of 220#, wherein the rotating speed of the grinding wheel is 1650r/min, the feeding is 5m/min, the cutting depth is ap0.1mm, and the parallelism size of the upper surface and the lower surface is ensured to be between-0.01 mm and +0.01 mm;

3) and carrying out rust prevention treatment on the ground blank, carrying out normal-temperature aging treatment on the rust-prevented blank, and standing for 24-36 hours at normal temperature.

4) And placing the blank subjected to aging treatment on a punch die of a high-speed punch press, and performing punch forming by using a 10-ton punch press.

5) Stamping and bending: performing stamping angle bending treatment on the blank stamped and formed in the step 4 on a bending die, and ensuring that the bending angle is 15 degrees plus or minus 0.1 degree;

6) quenching heat treatment: and (4) quenching the product processed in the step (5), cooling at-10 to-15 ℃, and then performing low-temperature tempering at 160 to 170 ℃ for one time to stabilize the size.

7) Aging heat treatment: fixing the blank treated in the step 6 in a shaping fixture tool, and then carrying out aging heat treatment for 12-14 hours;

8) low-temperature tempering heat treatment: and (4) carrying out secondary low-temperature tempering treatment on the product processed in the step (7) at 160-170 ℃ to stabilize the size.

9) Chamfering and polishing: processing the needle turning sheet processed and formed in the step 8 by a chamfering and polishing machine, and performing blunt and smooth transition on sharp corners to ensure that the absolute error of the surface roughness is below 1.6 um;

10) straightening and processing: and (4) correcting the stitch lifting sheet processed and molded in the step (9) by adopting a special tool, ensuring that the angle of the working part of the stitch lifting sheet is +/-0.1 degrees, and obtaining a semi-finished stitch lifting sheet.

11) Film coating treatment: and (3) coating the needle turning sheet processed and formed in the step (10) with a coating, and coating the surface by 0.05mm to finally obtain a finished needle turning sheet.

The traditional needle turnover sheet production process basically adopts a T8 alloy steel strip to punch and form a finished product through one-time heat treatment and appearance grinding and polishing treatment, has the problems of insufficient wear resistance, poor toughness and the like, and shortens the service life of a knitting needle and the stability of equipment; secondly, in the production process of the stitch sewing sheet, the stitch sewing sheet is relatively fine and thin, so that the deformation is large in the heat treatment process, the stitch sewing sheet cannot be repaired once the stitch sewing sheet is deformed, and the product yield is low.

According to the processing technology, the material of the stitch-over piece is newly optimized, T10 alloy steel with better performance is selected, the blank is subjected to heat treatment for many times, the deformation of the blank is reduced, the internal metallographic structure of the metal is refined, so that the internal stress is further eliminated, and finally, the precision, the toughness and the appearance quality of the stitch-over piece are greatly improved through correction treatment and coating treatment of a working part, the service life of the stitch-over piece is prolonged, the economic value of the product is improved, and a foundation is provided for the quality improvement of subsequent knitted products to a certain extent.

The invention can achieve the following beneficial effects: the stitch-over sheet produced by the improved process has the advantages of high hardness, good toughness, wear resistance and long service life, and the appearance is bright and beautiful and can replace foreign products.

Drawings

FIG. 1 is a schematic view of the structure of the stitch-flipping sheet of the present invention

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

The needle turning sheet production process comprises the following steps:

1) blank preliminary heat treatment: cutting a coiled strip-shaped T10 blank into strip-shaped blanks with each length of 1000mm, then clamping and fixing 5 strip-shaped blanks in a group by using a special clamp, and putting the blanks into an electric furnace for preliminary heat treatment, wherein the preliminary heat treatment is normalizing treatment, the normalizing treatment temperature is kept at 770-790 ℃, and the heat preservation time is 12-15 min; and then carrying out high-temperature tempering on the blank, wherein the high-temperature tempering temperature is 550-650 ℃, preserving the heat for 3-5 min, and then cooling the blank to room temperature in static air, so as to eliminate the stress generated during normalizing cooling and improve the toughness and plasticity.

2) Spreading the blank after the preliminary heat treatment, placing the blank in a special grinding fixture, grinding two planes on a surface grinding machine through a brown corundum grinding wheel with the abrasive grain of 220#, wherein the rotating speed of the grinding wheel is 1650r/min, the feeding is 5m/min, the cutting depth is ap0.1mm, and the parallelism size of the upper surface and the lower surface is ensured to be between-0.01 mm and +0.01 mm; .

11) Film coating treatment: and (3) coating the needle turning sheet processed and formed in the step (10) with a coating, and performing coating treatment on the surface by 0.05mm to finally obtain a finished needle turning sheet product, as shown in fig. 1.

The hardness of the product prepared by the scheme reaches 57-60 degrees in Rockwell, and the plasticity is improved by 15 percent; after the knitting needle is used for 3 months, through abrasion detection, the abrasion degree of the product is lower than 10% of that of the product manufactured by the traditional process, the damage rate of the product is reduced by 98.9%, the consistency of the product reaches more than 99%, the surface quality of the product is improved by 2 times, the service life of the knitting needle is prolonged by 45.7% through data statistics, and the production efficiency of equipment is greatly improved.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims

1. a transfer needle sheet production technique, is characterized in that described transfer needle sheet production technique comprises the following steps:

1) Preliminary heat treatment of blanks: Cut the strip-shaped T10 blanks into strip-shaped blanks of 1000mm each, then fasten and fix a group of five strip-shaped blanks with clamps, and put them into an electric furnace for preliminary heat treatment. The heat treatment is normalizing treatment, the normalizing treatment temperature is kept at 770-790 ℃, and the temperature is kept for 12-15 minutes; then the blank is tempered at a high temperature, and the high-temperature tempering temperature is 550-650 ℃, and the temperature is kept for 3-5 minutes, and then the blank is tempered at a high temperature. Cooling to room temperature in still air, the purpose is to eliminate the stress generated during normalizing cooling and improve toughness and plasticity;

2) Flatten the pre-heat-treated blank, place it in a special grinding fixture, and pass a brown corundum grinding wheel with an abrasive grain of 220# on a surface grinder. The grinding wheel speed is 1650r/min, the feed is 5m/min, and the cutting depth is ap0.1mm, the two planes are ground, and the parallelism of the upper and lower surfaces is guaranteed to be between -0.01~+0.01mm;

3) The ground blanks are subjected to anti-rust treatment, and the blanks after the anti-rust treatment are subjected to normal temperature aging treatment, and placed at room temperature for 24-36 hours;

4) Place the aging-treated blank on the die of the high-speed punch, and stamp it with a 10-ton punch;

5) Stamping and bending: The blank stamped in step 4 is subjected to stamping angle bending processing on the bending die to ensure that the bending angle is within 15° plus or minus 0.1°;

6) Quenching heat treatment: quench the product processed in step 5, and then perform a cold treatment at -10~-15°C after treatment, and then perform a low-temperature tempering treatment at 160~170°C to stabilize the size;

7) Aging heat treatment: first fix the blank treated in step 6 in the shaping fixture tooling, and then carry out aging heat treatment for 12 to 14 hours;

8) Low temperature tempering heat treatment: The product processed in step 7 is subjected to secondary low temperature tempering treatment at 160~170 ° C to stabilize the size;

9) Chamfering and polishing: Chamfering and polishing is performed on the transfer piece processed in step 8, and the sharp corners are blunt and smooth transition to ensure that the absolute error of surface roughness is below 1.6 um;

10) Straightening processing: Use special tooling to straighten the transfer piece processed and formed in step 9 to ensure that the angle of the working part of the transfer piece is ±0.1°, and the semi-finished product of the transfer piece is obtained;

11) Coating treatment: The transfer sheet processed and formed in step 10 is treated with coating film, and the surface is treated with 0.05mm coating, and finally the finished transfer sheet is obtained.