阅读说明：本技术 一种提高螺栓尾部端面平整度的工艺 (Process for improving flatness of end face of bolt tail ) 是由 顾锦华 邵泼 葛忠宇 朱俊 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种提高螺栓尾部端面平整度的工艺,包括如下步骤：1)准备原料：将金属棒材通过断料机构截断成加工所需的毛坯棒材,形成螺杆；2)初镦：对步骤一得到的螺杆进行第一次镦粗,使其成形为相连的头部和尾部,并且在此过程中直接对螺杆的尾部进行倒角；3)终镦：对步骤二得到的螺杆进行第二次镦粗,使螺杆的头部和尾部基本成型,并且在此过程中使用冷镦切边模内的顶杆对螺杆的尾部进行挤压使其尾部端面变的平整；4)切边：将步骤三加工出的螺杆的头部进行切边,使螺杆的头部和尾部彻底成型,步骤二中头部的直径大于尾部的直径,且头部的横截面为正六边形,能够对螺栓尾部端面进行多次整平使得螺栓的尾部非常的平整和美观。(The invention discloses a process for improving the end face flatness of a bolt tail, which comprises the following steps: 1) preparing raw materials: cutting the metal bar into a blank bar required by processing through a material cutting mechanism to form a screw rod; 2) initial upsetting: upsetting the screw rod obtained in the step one for the first time to form a head part and a tail part which are connected, and chamfering the tail part of the screw rod directly in the process; 3) final upsetting: upsetting the screw rod obtained in the step two for the second time to enable the head and the tail of the screw rod to be basically formed, and extruding the tail of the screw rod by using a top rod in a cold heading trimming die to enable the end face of the tail of the screw rod to be flat in the process; 4) trimming: and D, trimming the head of the screw rod processed in the step three to thoroughly mold the head and the tail of the screw rod, wherein the diameter of the head is larger than that of the tail in the step two, and the cross section of the head is a regular hexagon, so that the tail of the bolt is very flat and attractive due to repeated leveling of the end face of the tail of the bolt.)

1. A process for improving the end face flatness of a bolt tail end is characterized by comprising the following steps:

1) preparing raw materials: cutting the metal bar into a blank bar required by processing through a material cutting mechanism to form a screw (2);

2) initial upsetting: upsetting the screw (2) obtained in the step one for the first time to form a head part and a tail part which are connected, and chamfering the tail part of the screw (2) directly in the process;

3) final upsetting: upsetting the screw (2) obtained in the step two for the second time to enable the head and the tail of the screw (2) to be basically molded, and extruding the tail of the screw (2) by using an ejector rod (101) in the cold heading trimming die (1) to enable the end face of the tail of the screw to be flat in the process;

4) trimming: and (4) trimming the head part of the screw (2) processed in the third step to ensure that the head part and the tail part of the screw (2) are completely molded.

2. A process of improving the flatness of the end face of the tail of a bolt as defined in claim 1 wherein: before the first step, the metal bar needs to be pickled to remove the attached residues on the surface of the metal bar.

3. A process of improving the flatness of the end face of the tail of a bolt as defined in claim 1 wherein: in the second step, the diameter of the head part is larger than that of the tail part, and the cross section of the head part is in a regular hexagon shape.

4. A process of improving the flatness of the end face of the tail of a bolt as defined in claim 1 wherein: and in the process of the step four, the end face of the part is extruded by using the ejector rod (101) in the cold heading trimming die (1) again to flatten the end face of the tail part of the part.

5. A process of improving the flatness of the end face of the tail of a bolt as defined in claim 1 wherein: the material cutting mechanism comprises a material cutting die and a cutter, the distance between the material cutting die and the cutter is L, L = material diameter X0.04mm when the material is soft steel, and L = material diameter X0.02mm when the material is hard steel.

6. A process of improving the flatness of the end face of the tail of a bolt as defined in claim 1 wherein: the clearance between the ejector rod (101) and the inner hole of the cold heading trimming die (1) is 0.05 mm.

Technical Field

The invention relates to the technical field of cold heading processes, in particular to a process for improving the end face flatness of a bolt tail.

Background

The problem that the end face of the tail part of the bolt is required to be flat by customers is often encountered in work. However, in actual operation, the end face of the tail part of the bolt produced by cold heading by a cold heading machine is often unsatisfactory. The end face can only be flattened by cutting or grinding in the past, but the method has low efficiency and serious waste and is not suitable for mass production, the end face condition can be improved by optimizing the old process, but the method is still unsatisfactory, and therefore the process for improving the flatness of the end face of the bolt tail end is provided to solve the problems.

Disclosure of Invention

The invention aims to overcome the existing defects and provides a process for improving the end face flatness of the bolt tail, which can level the end face of the bolt tail for multiple times, so that the tail of the bolt is very flat and beautiful, and the problems in the background art can be effectively solved.

In order to achieve the purpose, the invention provides the following technical scheme: a process for improving the flatness of the end face of the tail of a bolt comprises the following steps:

1) preparing raw materials: cutting the metal bar into a blank bar required by processing through a material cutting mechanism to form a screw rod;

2) initial upsetting: upsetting the screw rod obtained in the step one for the first time to form a head part and a tail part which are connected, and chamfering the tail part of the screw rod directly in the process;

3) final upsetting: upsetting the screw rod obtained in the step two for the second time to enable the head and the tail of the screw rod to be basically formed, and extruding the tail of the screw rod by using a top rod in a cold heading trimming die to enable the end face of the tail of the screw rod to be flat in the process;

4) trimming: and D, trimming the head of the screw rod processed in the step three to thoroughly mold the head and the tail of the screw rod.

In a preferred embodiment of the present invention, the metal bar is pickled before the first step to remove the residue attached to the surface of the metal bar.

In the second step, the diameter of the head part is larger than that of the tail part, and the cross section of the head part is in a regular hexagon shape.

And as a preferred technical scheme of the invention, the end surface of the part is extruded by using the ejector rod in the cold heading trimming die again in the process of the step four, so that the end surface of the tail part of the part is flattened.

As a preferred technical scheme of the invention, the material cutting mechanism comprises a material cutting die and a cutter, wherein the distance between the material cutting die and the cutter is L, L = material diameter X0.04mm when the material is soft steel, and L = material diameter X0.02mm when the material is hard steel.

As a preferred technical scheme of the invention, the clearance between the ejector rod and the inner hole of the cold heading trimming die is 0.05 mm.

Compared with the prior art, the invention has the beneficial effects that: the process for improving the end face flatness of the bolt tail has the following advantages:

the invention perfectly solves the problem of flattening the end face of the tail part of the bolt by directly chamfering through primary upsetting, and particularly can be obviously improved when the product with high requirement on the tail part of the bolt or production equipment is old and cannot be ensured.

Drawings

FIG. 1 is a schematic structural diagram of a primary upsetting step of the present invention;

FIG. 2 is a schematic diagram of the structure of the final upsetting step of the present invention.

In the figure: 1 cold heading trimming die, 101 ejector rods and 2 screw rods.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a process for improving the flatness of the end face of the tail of a bolt comprises the following steps:

1) preparing raw materials: cutting the metal bar into a blank bar required by processing through a material cutting mechanism to form a screw rod 2, and before the screw rod is subjected to acid cleaning, removing residues attached to the surface of the metal bar;

2) initial upsetting: upsetting the screw rod 2 obtained in the first step for the first time to form a head part and a tail part which are connected, chamfering the tail part of the screw rod 2 directly in the process, wherein the diameter of the head part is larger than that of the tail part, and the cross section of the head part is in a regular hexagon shape;

3) final upsetting: upsetting the screw rod 2 obtained in the second step for the second time to enable the head and the tail of the screw rod 2 to be basically molded, and extruding the tail of the screw rod 2 by using an ejector rod 101 in the cold heading trimming die 1 in the process to enable the end face of the tail of the screw rod 2 to be flat;

4) trimming: and (3) trimming the head part of the screw rod 2 processed in the step three to ensure that the head part and the tail part of the screw rod 2 are completely formed, and extruding the end surface of the part by using the ejector rod 101 in the cold heading trimming die 1 again in the process to ensure that the end surface of the tail part of the part becomes flat.

The material cutting mechanism comprises a material cutting die and a cutter, the distance between the material cutting die and the cutter is L, L = material diameter X0.04mm when the material is soft steel, and L = material diameter X0.02mm when the material is hard steel.

The clearance between the ejector rod 101 and the inner hole of the cold heading trimming die 1 is 0.05 mm.

The invention comprises the following steps: put the preliminary upsetting through the chamfer for the final upsetting can once the bolt afterbody flattening, and the side cut flattening is once again, makes very level and smooth, pleasing to the eye of afterbody of bolt after the flattening of two here.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.