阅读说明：本技术 经编机槽针的制作方法 (Method for manufacturing groove needle of warp knitting machine ) 是由 蔡铭德 于 2019-07-24 设计创作，主要内容包括：本发明涉及一种经编机槽针的制作方法,所述方法包括如下步骤：将金属粉末注射到成型模具中,在预设模温的环境下,对金属粉末进行成型作业后取出得到初成型槽针；对初成型槽针依次进行去浇口以及修边作业,再对修边后的初成型槽针进行催化脱脂以及烧结作业；对烧结后的初成型槽针进行磁抛以及初次整形作业,清洗并热处理后进行二次整形；对二次整形后的初成型槽针进行平面研磨、内槽研磨、抛光、镀铬以及镭雕处理后得到经编机槽针。本发明提出的经编机槽针的制作方法,简化了制作流程,且保证了经编机槽针的质量。(The invention relates to a method for manufacturing a grooved needle of a warp knitting machine, which comprises the following steps: injecting metal powder into a forming die, and taking out the metal powder after forming operation in an environment with preset die temperature to obtain a primary forming grooved needle; sequentially performing sprue removal and trimming operation on the primary forming grooved needle, and performing catalytic degreasing and sintering operation on the trimmed primary forming grooved needle; performing magnetic polishing and primary shaping operation on the sintered primary forming grooved needle, cleaning and performing secondary shaping after heat treatment; and carrying out plane grinding, inner groove grinding, polishing, chromium plating and laser etching on the primary forming grooved needle subjected to secondary shaping to obtain the grooved needle of the warp knitting machine. The manufacturing method of the groove needle of the warp knitting machine provided by the invention simplifies the manufacturing process and ensures the quality of the groove needle of the warp knitting machine.)

1. A method for manufacturing a groove needle of a warp knitting machine is characterized by comprising the following steps:

injecting metal powder into a forming die, and taking out the metal powder after forming operation in an environment with a preset die temperature to obtain a primary forming grooved needle;

sequentially performing sprue removal and trimming operation on the preliminary forming grooved needle, and performing catalytic degreasing and sintering operation on the trimmed preliminary forming grooved needle;

performing magnetic polishing and primary shaping operation on the sintered primary forming grooved needle, cleaning and performing secondary shaping after heat treatment;

and carrying out plane grinding, inner groove grinding, polishing, chromium plating and laser etching treatment on the primary forming grooved needle subjected to secondary shaping to obtain the grooved needle of the warp knitting machine.

2. The method for manufacturing a grooved needle of a warp knitting machine according to claim 1, wherein in the step of injecting the metal powder into a molding die, keeping the molding die at a predetermined temperature, and taking out the metal powder after the molding operation to obtain a preliminary molding grooved needle;

the injection process adopts a single-stage injection molding rapid forming process, the injection time is 0.02-0.1 s, the preset mold temperature is 110-165 ℃, and the material temperature corresponding to the metal powder is 150-200 ℃.

3. The method of manufacturing a warp knitting machine groove needle according to claim 1, wherein the method of sequentially degating the preliminary molding groove needle includes the steps of:

and separating the preliminary forming grooved needle from the waste head.

4. The method for manufacturing a warp knitting machine grooved needle according to claim 1, wherein the step of subjecting the preliminary molding grooved needle to catalytic degreasing includes three steps of:

the first stage is as follows: the early stage flushing is carried out, the preliminary forming grooved needle is placed in a furnace, nitrogen is quantitatively filled through a pipeline, so that air in the furnace is completely replaced, and heating and heat preservation are started;

and a second stage: controlling the temperature to be in a heat preservation state, injecting nitric acid into the furnace by operating an acid pump, atomizing the nitric acid in the furnace, and starting catalytic degreasing;

and a third stage: and (5) stopping the acid pump, replacing gas in the furnace, cooling and finishing the catalytic degreasing operation.

5. The method for manufacturing a grooved needle of a warp knitting machine according to claim 4, wherein in the method for performing the catalytic degreasing treatment on the preliminary-formed grooved needle, in the first stage, the corresponding temperature is 115 ℃, the operation time is 45min, the nitrogen flow rate is 80L/min, the nitric acid flow rate is 2.5ml/min, and the fan rotation speed is 1300 r/min; in the second stage, the corresponding temperature is 115 ℃, the operation time is 120min, the nitrogen flow is 80L/min, the nitric acid flow is 2.5ml/min, and the fan rotating speed is 1300 r/min; in the third stage, the corresponding temperature is 115 ℃, the operation time is 45min, the nitrogen flow is 80L/min, the nitric acid flow is 2.5ml/min, and the fan rotation speed is 1300 r/min.

6. The method for manufacturing a warp knitting machine grooved needle according to claim 1, wherein the sintering operation of the preliminary formed grooved needle after the catalytic degreasing includes the steps of:

the first step is as follows: degreasing under negative pressure, namely degreasing by selecting temperature rising curves with different slopes;

the second step is that: vacuum sintering, further sintering the product under the conditions of high temperature and high vacuum;

the third step: partial pressure sintering, under the protection of argon, the temperature is continuously raised, so that the product is sintered to the most compact state;

the fourth step: and after sintering, cooling to a normal temperature state.

7. The method for manufacturing a grooved needle of a warp knitting machine according to claim 6, wherein in the step of degreasing under negative pressure, the operating temperature is 350 ℃ to 800 ℃, the introduced gas is nitrogen, and the flow rate of the nitrogen is 30L/min; in the vacuum sintering step, the corresponding vacuum sintering temperature is 1000 ℃, and the vacuum sintering time is 100 min; in the partial pressure sintering step, the corresponding partial pressure sintering temperature is 1350 ℃, the introduced gas is argon, and the flow of the argon is 15L/min; in the cooling step, the corresponding cooling temperature is 800 ℃, and the introduced gas is argon.

8. The method of manufacturing a warp knitting machine grooved needle according to claim 1, characterized in that the method of performing the primary shaping work on the primary formed grooved needle includes the steps of:

placing the preliminary forming grooved needle in a plane tool, and then installing the plane tool in a hydraulic press, wherein the plane tool comprises an upper die insert and a lower die insert which are oppositely arranged in the vertical direction, and the upper die insert and the lower die insert are adjusted through a thread of the hydraulic press so that the flatness of the preliminary forming grooved needle is less than 0.05 mm;

the method comprises the steps that a preliminary forming grooved needle is placed in a size tool, then the size tool is installed in a hydraulic press, the size tool comprises a left sliding block, a right sliding block and a head sliding block which are adjacently arranged on the same axis in the horizontal direction, and the head sliding block is adjusted through the hydraulic press to adjust the head size of the preliminary forming grooved needle.

9. The method for manufacturing a grooved needle of a warp knitting machine according to claim 8, wherein the equipment pressure of the hydraulic press is 0.4 to 0.8MPa, and the delay time of the hydraulic press is 0.5 to 1 s.

10. The method of claim 1, wherein the thickness of the chrome plating applied to the preliminary-formed grooved needle is 2 to 5 um.

Technical Field

The invention relates to the technical field of manufacturing of textile auxiliary devices, in particular to a manufacturing method of a grooved needle of a warp knitting machine.

Background

In the textile field, warp knitting machines are a very important textile apparatus. The grooved needle for the warp knitting machine is a composite needle, has high requirements on performance and manufacturing precision, and is a key part in the knitting machine. The grooved needles directly participate in the weaving of the fabric, and the performance of the grooved needles is not only related to the quality of the fabric, but also directly affects the running efficiency of the warp knitting machine.

With the rapid development of the knitting industry in China, the demand of high-end knitting needles on the market is increased, but the high-end knitting needles are influenced by the manufacturing level of the knitting needles in China, the use of the high-end knitting needles is mostly solved by import, particularly, the quality of the knitting needles is unstable due to the fact that the research on the technical process and materials of the knitting needles in China is very little or even none, the key parts of the knitting needles cannot meet the requirement on the service performance, and the service life is short. So that domestic knitting product enterprises are more inclined to use knitting needles imported from abroad. The price of the foreign imported warp knitting machine grooved needle, especially some thin, thin and long high-grade warp knitting grooved needles, is usually tens of times of the domestic common warp knitting grooved needle.

However, the groove needle of the traditional warp knitting machine is manufactured by adopting the traditional stamping mode all the time, the processing difficulty is high, and the steps are complex.

Disclosure of Invention

Based on the above, the invention aims to solve the problems that the traditional warp knitting machine groove needle is manufactured by adopting a traditional stamping mode all the time, the processing difficulty is high, and the steps are complex in the prior art.

In order to solve the technical problem, the invention provides a method for manufacturing a grooved needle of a warp knitting machine, wherein the method comprises the following steps:

injecting metal powder into a forming die, and taking out the metal powder after forming operation in an environment with a preset die temperature to obtain a primary forming grooved needle;

sequentially performing sprue removal and trimming operation on the preliminary forming grooved needle, and performing catalytic degreasing and sintering operation on the trimmed preliminary forming grooved needle;

performing magnetic polishing and primary shaping operation on the sintered primary forming grooved needle, cleaning and performing secondary shaping after heat treatment;

and carrying out plane grinding, inner groove grinding, polishing, chromium plating and laser etching treatment on the primary forming grooved needle subjected to secondary shaping to obtain the grooved needle of the warp knitting machine.

The invention provides a manufacturing method of a grooved needle of a warp knitting machine, which is different from the traditional punching manufacturing mode, adopts metal powder as a raw material for manufacturing the grooved needle of the warp knitting machine, obtains a primary-formed grooved needle by injecting the metal powder into a forming die, improves the chemical property of the primary-formed grooved needle and enhances the physical strength of the primary-formed grooved needle by removing a sprue and trimming, further modifies the shape of the grooved needle by catalytic degreasing and sintering, and finally protects the surface of the grooved needle by operations of grinding, polishing, chrome plating, laser engraving and the like. The manufacturing process of the grooved needle is fundamentally changed, so that the grooved needle punching process is different from the traditional punching manufacturing process, the quality of the grooved needle is ensured, the manufacturing process is simplified, and the grooved needle punching process has a good application prospect.

The manufacturing method of the groove needle of the warp knitting machine comprises the steps of injecting metal powder into a forming die, ensuring that the forming die is at a preset temperature, and taking out the metal powder after forming operation to obtain a primary forming groove needle;

the injection process adopts a single-stage injection molding rapid forming process, the injection time is 0.02-0.1S, the preset mold temperature is 110-165 ℃, and the material temperature corresponding to the metal powder is 150-200 ℃.

The manufacturing method of the warp knitting machine groove needle comprises the following steps of:

and separating the preliminary forming grooved needle from the waste head.

The manufacturing method of the warp knitting machine grooved needle comprises the following three stages of carrying out catalytic degreasing treatment on the preliminary forming grooved needle:

the first stage is as follows: the early stage flushing is carried out, the preliminary forming grooved needle is placed in a furnace, nitrogen is quantitatively filled through a pipeline, so that air in the furnace is completely replaced, and heating and heat preservation are started;

and a second stage: controlling the temperature to be in a heat preservation state, injecting nitric acid into the furnace by operating an acid pump, atomizing the nitric acid in the furnace, and starting catalytic degreasing;

and a third stage: and (5) stopping the acid pump, replacing gas in the furnace, cooling and finishing the catalytic degreasing operation.

In the manufacturing method of the grooved needle of the warp knitting machine, in the method for carrying out catalytic degreasing treatment on the preliminary-formed grooved needle, in the first stage, the corresponding temperature is 115 ℃, the operation time is 45min, the nitrogen flow is 80L/min, the nitric acid flow is 2.5ml/min, and the rotating speed of a fan is 1300 r/min; in the second stage, the corresponding temperature is 115 ℃, the operation time is 120min, the nitrogen flow is 80L/min, the nitric acid flow is 2.5ml/min, and the fan rotating speed is 1300 r/min; in the third stage, the corresponding temperature is 115 ℃, the operation time is 45min, the nitrogen flow is 80L/min, the nitric acid flow is 2.5ml/min, and the fan rotation speed is 1300 r/min.

The manufacturing method of the warp knitting machine grooved needle comprises the following steps of:

the first step is as follows: degreasing under negative pressure, namely degreasing by selecting temperature rising curves with different slopes;

the second step is that: vacuum sintering, further sintering the product under the conditions of high temperature and high vacuum;

the third step: partial pressure sintering, under the protection of argon, the temperature is continuously raised, so that the product is sintered to the most compact state;

the fourth step: and after sintering, cooling to a normal temperature state.

In the manufacturing method of the warp knitting machine grooved needle, in the sintering operation method of the preliminary-formed grooved needle after catalytic degreasing, in the negative pressure degreasing step, the operation temperature range is 350-800 ℃, the introduced gas is nitrogen, and the flow rate of the nitrogen is 30L/min; in the vacuum sintering step, the corresponding vacuum sintering temperature is 1000 ℃, and the vacuum sintering time is 100 min; in the partial pressure sintering step, the corresponding partial pressure sintering temperature is 1350 ℃, the introduced gas is argon, and the flow of the argon is 15L/min; in the cooling step, the corresponding cooling temperature is 800 ℃, and the introduced gas is argon.

The manufacturing method of the warp knitting machine grooved needle comprises the following steps of:

placing the preliminary forming grooved needle in a plane tool, and then installing the plane tool in a hydraulic press, wherein the plane tool comprises an upper die insert and a lower die insert which are oppositely arranged in the vertical direction, and the upper die insert and the lower die insert are adjusted through a thread of the hydraulic press so that the flatness of the preliminary forming grooved needle is less than 0.05 mm;

the method comprises the steps that a preliminary forming grooved needle is placed in a size tool, then the size tool is installed in a hydraulic press, the size tool comprises a left sliding block, a right sliding block and a head sliding block which are adjacently arranged on the same axis in the horizontal direction, and the head sliding block is adjusted through the hydraulic press to adjust the head size of the preliminary forming grooved needle.

The manufacturing method of the groove needle of the warp knitting machine is characterized in that the equipment pressure of the hydraulic machine is 0.4-0.8 MPa, and the delay time of the hydraulic machine is 0.5-1S.

The manufacturing method of the groove needle of the warp knitting machine is characterized in that the thickness of the chrome plated groove needle for primary forming is 2-5 um.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a flow chart of a method for manufacturing a grooved needle of a warp knitting machine according to a first embodiment of the present invention;

FIG. 2 is a flow chart of a method for manufacturing a grooved needle of a warp knitting machine according to a second embodiment of the present invention;

FIG. 3 is an exploded view of a grooved pin injection molding mold according to a second embodiment of the present invention;

FIG. 4 is a fixed mold structure view of a slot needle molding die in a second embodiment of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a sectional view showing the structure of a grooved pin forming mold according to a second embodiment of the present invention;

FIG. 7 is a schematic view showing the overall structure of a groove pin trimming and positioning die of a warp knitting machine according to a second embodiment of the present invention;

FIG. 8 is a left side view of a groove pin trimming positioning die of a warp knitting machine according to a second embodiment of the present invention;

FIG. 9 is a partial schematic structural view of a trimming and positioning mold for a grooved needle of a warp knitting machine according to a second embodiment of the present invention;

FIG. 10 is a partial schematic structural view of a trimming positioning mold for a grooved needle of a warp knitting machine according to a second embodiment of the present invention;

FIG. 11 is a schematic structural view of a groove needle plane tooling mold of a warp knitting machine according to a second embodiment of the present invention;

FIG. 12 is a schematic structural view of a groove needle of a warp knitting machine according to a second embodiment of the present invention;

FIG. 13 is an exploded view of a groove needle plane tooling mold of a warp knitting machine according to a second embodiment of the present invention;

FIG. 14 is a schematic structural view of a lower mold core in the groove needle plane tooling mold of the warp knitting machine shown in FIG. 11;

FIG. 15 is a schematic structural view of a lower die insert in the flat face tooling mold for the grooved needle of the warp knitting machine shown in FIG. 11;

FIG. 16 is an assembly view of a slot pin sizing die according to a second embodiment of the present invention;

FIG. 17 is a cross-sectional view of the slot pin sizing die assembly shown in FIG. 16;

FIG. 18 is an exploded view of the slot pin sizing die of FIG. 16;

FIG. 19 is a schematic view of the structure of the upper size seat of the slot pin sizing die shown in FIG. 16;

fig. 20 is a schematic structural view of a lower size holder in the slot pin sizing die shown in fig. 16.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, 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 be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The traditional warp knitting machine groove needle is manufactured by adopting a traditional stamping mode all the time, and has high processing difficulty and complex steps.