阅读说明：本技术 一种高强度铆螺母的生产工艺 (Production process of high-strength rivet nut ) 是由 袁诚 于 2021-05-26 设计创作，主要内容包括：本发明提供了一种高强度铆螺母的生产工艺,属于铆螺母加工技术领域。它解决了现有铆螺母强度无法提高等技术问题。本一种高强度铆螺母的生产工艺,包括以下步骤：1)、原材料球化退火：选取原材料对原材料进行球化退火处理；2)、镦打成型：将球化退火后原材料通过冷镦形成毛坯；3)、除油；4)、区部退火：对除油后的毛坯的指定位置进行区部退火；5)、酸洗：将区部退火后的毛坯通过酸洗液进行酸洗；6)、攻丝：通过零件机对毛坯内部进行攻牙和攻丝形成铆螺母；7)、表面处理：对铆螺母表面进行处理；8)、筛选：对铆螺母进行测试,筛选出强度合格的铆螺母；9)、包装。本发明具有铆螺母整体强度提高和生产效率高的优点。(The invention provides a production process of a high-strength rivet nut, and belongs to the technical field of rivet nut processing. It has solved current rivet nut intensity and can't improve class of technical problem. The production process of the high-strength rivet nut comprises the following steps: 1) spheroidizing annealing of raw materials: selecting raw materials to carry out spheroidizing annealing treatment on the raw materials; 2) and upsetting and forming: forming a blank by cold heading the spheroidized annealed raw material; 3) removing oil; 4) and annealing the area part: performing zone annealing on the specified position of the deoiled blank; 5) acid washing: pickling the blank subjected to zone annealing by using a pickling solution; 6) and tapping: tapping and tapping the interior of the blank by a workpiece machine to form a rivet nut; 7) and surface treatment: processing the surface of the rivet nut; 8) and screening: testing the rivet nuts, and screening out the rivet nuts with qualified strength; 9) and (6) packaging. The invention has the advantages of improved overall strength of the rivet nut and high production efficiency.)

1. The production process of the high-strength rivet nut is characterized by comprising the following steps of:

1) spheroidizing annealing of raw materials: selecting raw materials to carry out spheroidizing annealing treatment on the raw materials;

2) and upsetting and forming: forming a blank by cold heading the spheroidized annealed raw material;

3) removing oil;

4) and annealing the area part: performing zone annealing on the specified position of the deoiled blank;

5) acid washing: pickling the blank subjected to zone annealing by using a pickling solution;

6) and tapping: tapping and tapping the interior of the blank by a workpiece machine to form a rivet nut;

7) and surface treatment: processing the surface of the rivet nut;

8) and screening: testing the rivet nuts, and screening out the rivet nuts with qualified strength;

9) and (6) packaging.

2. The process for producing a high-strength rivet nut as claimed in claim 1, wherein the raw material is selected from the group consisting of ML10 AL.

3. The production process of the high-strength rivet nut as claimed in claim 1, wherein the thickness of the riveting wall of the blank formed in the cold heading is not less than 0.5 mm.

4. The process for producing a high-strength rivet nut as claimed in claim 1, wherein the zone annealing is to convey the blank to a processing station, and heat-anneal the specified position of the blank by a manipulator and a high-frequency induction heater.

5. The production process of the high-strength rivet nut as claimed in claim 1, wherein the tail of the blank is a parallel transition angle of 4-5 degrees, and the effective number of turns of the thread of the blank is increased by 1-2 turns during tapping.

6. The production process of the high-strength rivet nut according to claim 1, characterized in that the test is a minimum load limit value index of a set load, and when the load reaches the set index, the static load value retention time of the set index is more than or equal to 20 s.

Technical Field

The invention belongs to the technical field of rivet nut processing, and relates to a production process of a high-strength rivet nut.

Background

The rivet nut is developed for overcoming the defects that a metal sheet and a thin pipe welded nut are easy to melt, a base material is easy to weld and deform, an internal thread is easy to slip, and the like.

Disclosure of Invention

The invention aims to provide a production process of a high-strength rivet nut aiming at the problems in the prior art, and solves the problem that the strength of the rivet nut cannot be improved.

The purpose of the invention can be realized by the following technical scheme:

the production process of the high-strength rivet nut is characterized by comprising the following steps of:

1) spheroidizing annealing of raw materials: selecting raw materials to carry out spheroidizing annealing treatment on the raw materials;

2) and upsetting and forming: forming a blank by cold heading the spheroidized annealed raw material;

3) removing oil;

4) and annealing the area part: performing zone annealing on the specified position of the deoiled blank;

5) acid washing: pickling the blank subjected to zone annealing by using a pickling solution;

6) and tapping: tapping and tapping the interior of the blank by a workpiece machine to form a rivet nut;

7) and surface treatment: processing the surface of the rivet nut;

8) and screening: testing the rivet nuts, and screening out the rivet nuts with qualified strength;

9) and (6) packaging.

According to the production method, raw materials are selected for spheroidizing annealing, then cold heading forming is carried out on the raw materials, oil removal is carried out on a formed blank to remove oil stains on the surface of a product, then zone annealing stress removal and softening are carried out on the blank, the blank is pickled after zone annealing, then the blank is tapped to manufacture threads in the blank to form the rivet nut, surface treatment is carried out on the rivet nut to ensure the use of the rivet nut, the rivet nut is tested and screened to ensure that the strength of the rivet nut meets the requirement, the qualified rivet nut is packaged, and the production of the rivet nut is completed.

In the production process of the high-strength rivet nut, the material selected from the raw materials is marked as ML10 AL. The hardness of the product can be improved to HRB40 by changing the selection of raw materials in the structure.

In the production process of the high-strength rivet nut, the thickness of the riveting wall of the formed blank in the cold heading is more than or equal to 0.5 mm. Under the prerequisite of guaranteeing the shearing force in this structure, reduced the thickness of riveting wall and minimum for 0.5mm, improved the performance of product.

In the production process of the high-strength rivet nut, the annealing of the area part is to convey the blank to a processing table and heat and anneal the specified position of the blank by a manipulator and a high-frequency induction heater. Through carrying out district's portion annealing to the blank assigned position in this structure, the relief stress makes the material tissue soften, reduces the hardness of assigned position department, guarantees the inflation effect of riveting the nut, guarantees simultaneously that the hardness of riveting other positions of nut is unchangeable, has improved the holistic hardness of riveting the nut.

In the production process of the high-strength rivet nut, the tail of the blank is a parallel transition angle of 4-5 degrees, and the number of effective turns of the thread of the blank is increased by 1-2 turns during tapping. The effective number of turns of the thread of the blank during tapping is increased by changing the parallel excessive angle at the tail of the blank in the structure, so that the mechanical property of the product is improved by 2-3 KN.

In the production process of the high-strength rivet nut, the test is the minimum load-holding limit value index of the set load, and when the load reaches the set index, the time for setting the static load value of the index is more than or equal to 20 s. This structure is guaranteed to detect the intensity of riveting the nut, selects the riveting nut that accords with.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the hardness of the raw material is improved by selecting the raw material, spheroidizing annealing is carried out, then the raw material is subjected to cold heading forming, the thickness of a riveting wall is reduced on the premise of ensuring the shearing force, the formed blank is subjected to oil removal to eliminate oil stains on the surface of a product, then the blank is subjected to zone annealing to convey the blank to a processing table, a specified position of the blank is subjected to heating annealing through a manipulator and a high-frequency induction heater, stress and softening are eliminated, the hardness at the specified position is reduced, the expansion effect of the rivet nut is ensured, the hardness of other positions of the rivet nut is ensured to be unchanged, the integral hardness of the rivet nut is improved, and the blank is subjected to acid pickling after zone annealing;

2. tapping the blank to manufacture threads in the blank to form a rivet nut, changing a parallel over-angle at the tail of the blank to increase the effective number of turns of the threads during tapping of the blank, improving the mechanical performance of a product, performing surface treatment on the rivet nut to ensure the use of the rivet nut, testing and screening the rivet nut, and ensuring that the strength of the rivet nut reaches 8 grades; 10 grade; the 12-grade 1-type rivet nut meets the requirements of GB/T30982.2-2000 and GB/T30984.4-2000 regulations, and the qualified rivet nut is packaged to complete the production of the rivet nut.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

A production process of a high-strength rivet nut comprises the following steps:

1) spheroidizing annealing of raw materials: selecting raw materials to carry out spheroidizing annealing treatment on the raw materials;

2) and upsetting and forming: forming a blank by cold heading the spheroidized annealed raw material;

3) removing oil;

4) and annealing the area part: performing zone annealing on the specified position of the deoiled blank;

5) acid washing: pickling the blank subjected to zone annealing by using a pickling solution;

6) and tapping: tapping and tapping the interior of the blank by a workpiece machine to form a rivet nut;

7) and surface treatment: processing the surface of the rivet nut;

8) and screening: testing the rivet nuts, and screening out the rivet nuts with qualified strength;

9) and (6) packaging.

According to the production method, raw materials are selected for spheroidizing annealing, then cold heading forming is carried out on the raw materials, oil removal is carried out on a formed blank to remove oil stains on the surface of a product, then zone annealing stress removal and softening are carried out on the blank, the blank is pickled after zone annealing, then the blank is tapped to manufacture threads in the blank to form the rivet nut, surface treatment is carried out on the rivet nut to ensure the use of the rivet nut, the rivet nut is tested and screened to ensure that the strength of the rivet nut meets the requirement, the qualified rivet nut is packaged, and the production of the rivet nut is completed.

Specifically, the material label of the raw material is ML10 AL. The hardness of the product can be improved to HRB40 by changing the selection of raw materials in the structure.

Specifically, the thickness of the riveting wall of the formed blank in the cold heading is more than or equal to 0.5 mm. Under the prerequisite of guaranteeing the shearing force in this structure, reduced the thickness of riveting wall and minimum for 0.5mm, improved the performance of product.

Specifically, the zone annealing is to convey the blank to a processing table, and heat-anneal the specified position of the blank by a manipulator and a high-frequency induction heater. Through carrying out district's portion annealing to the blank assigned position in this structure, the relief stress makes the material tissue soften, reduces the hardness of assigned position department, guarantees the inflation effect of riveting the nut, guarantees simultaneously that the hardness of riveting other positions of nut is unchangeable, has improved the holistic hardness of riveting the nut.

Specifically, the tail of the blank is a parallel transition angle of 4-5 degrees, and the effective number of turns of the thread of the blank is increased by 1-2 turns during tapping. The effective number of turns of the thread of the blank during tapping is increased by changing the parallel excessive angle at the tail of the blank in the structure, so that the mechanical property of the product is improved by 2-3 KN.

Specifically, the test is to set the minimum load-holding limit value index of the load, and when the load reaches the set index, the time for setting the static load value of the index is more than or equal to 20 s. This structure is guaranteed to detect the intensity of riveting the nut, selects the riveting nut that accords with.

The above components are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.