CN204486957U - A kind of frock for high-strength bolt bar portion burnishing-in - Google Patents

Abstract

The utility model discloses a frock for extruding the shank of a high-strength bolt, which is characterized in that it is mainly composed of a dovetail seat, two extruding dies and a support plate, and the two extruding dies are fixed on a machine tool by clamping bolts On the two main shafts, the support plate is set on the support plate seat, an adjusting bolt is provided between the support plate and the support plate seat, the support plate seat is fixed on the dovetail seat, and a brake is set between the dovetail seat and the support plate seat. Iron and brake iron fixing bolts. The utility model has the advantages of simple operation, low technical requirements for operators, low processing cost, suitable for high-strength bolt production enterprises, suitable for mass production, high production efficiency, stable quality of squeezed products, good finish, and relatively High promotional value.

Description

A tool for squeezing out the shank of high-strength bolts

technical field

The utility model relates to a high-strength bolt, in particular to a tool used for squeezing the shank of the high-strength bolt.

Background technique

High-strength bolts are mainly used in high-load motion environments such as internal combustion engine assembly and wind power generation, and require high mechanical properties and high corrosion resistance. The current finishing process for high-strength bolts is: CNC finishing turning → fine grinding the outer circle of the rod → flaw detection → thread rolling. Among them: the outer circle of the fine grinding rod is to eliminate the knife marks generated during the fine turning, eliminate the stress concentration, and prevent the bolt from being stretched and broken during installation or operation. During the fine grinding process, the skill level of the operator determines the smoothness of the bolt shank, and the product quality is unstable. Some products have a smooth finish between Ra3.2 and Ra1.6 after fine grinding, and there are still residual knife marks, causing stress concentration; In addition, fine grinding requires a large number of grinding wheels and diamonds for correcting the grinding wheels, resulting in high manufacturing costs.

Utility model content

The purpose of the utility model is to completely eliminate stress concentration, solve the problem of elongation and breakage, and at the same time provide a tool for squeezing out the shank of a high-strength bolt in order to reduce the manufacturing cost.

The technical scheme that realizes the utility model purpose is:

A tooling for high-strength bolt shank extrusion, which is mainly composed of dovetail seat, extrusion die and support plate. The two extrusion dies are fixed on the two spindles of the machine tool through clamping bolts, and the support plate is set on the support plate. On the seat, adjusting bolts are arranged between the support plate and the support plate seat, the support plate seat is fixedly arranged on the dovetail seat, and brake irons and brake iron fixing bolts are arranged between the dovetail seat and the support plate seat.

The minimum distance between the squeeze dies is consistent with the outer diameter of the bolts to be squeezed.

When working, start the machine tool to rotate the extrusion die, start the automatic feeding of the extrusion die, and place the workpiece bolts on the support plate at the moment when the extrusion die exits. When the extrusion die is fed, squeeze the bolt shaft of the workpiece until the tool mark on the bolt shaft disappears. At this time, the smoothness of the bolt shaft reaches Ra0.8. The extrusion die automatically exits, and the bolt of the workpiece is removed, and the extrusion process is completed. .

The utility model has the advantages of simple operation, low technical requirements for the operator, low processing cost, suitable for high-strength bolt production enterprises, suitable for mass production, high production efficiency, stable quality of squeezed products, good finish, and relatively High promotional value.

Description of drawings

Fig. 1 is a schematic diagram of the squeezing principle of the tooling of the utility model.

In the figure: 1. Extrusion mold 2. Support plate 3. Work bolt 4. Adjusting bolt 5. Support plate seat 6. Brake iron 7. Brake iron fixing bolt 8. Dovetail seat 9. Fixing bolt.

Detailed ways

Referring to Fig. 1, a tooling for extruding the shank of a high-strength bolt is composed of an extruding die 1, a support plate 2, a support plate seat 5, a brake iron 6, a brake iron fixing bolt 7 and a dovetail seat 8. The mold 1 is symmetrically arranged left and right, and the support plate 2 is arranged on the support plate seat 5. The minimum distance between the two extrusion dies 1 is consistent with the outer diameter of the bolt to be squeezed out. There is an adjusting bolt 4, and the height of the support plate 2 is adjusted to an appropriate position by using the adjusting bolt 4. The support plate seat 5 is fixedly arranged on the dovetail seat 8, and a brake iron 6 and a brake iron 6 are arranged between the dovetail seat 8 and the support plate seat 5. Iron fixing bolts7.

When working, start the machine tool to rotate the extrusion die 1, start the automatic feeding of the extrusion die 1, and put the workpiece bolt 3 into the upper plane of the support plate 2 at the moment when the extrusion die 1 exits. When the extrusion die 1 is fed, squeeze the shank of the workpiece bolt 3 until the tool mark on the shank of the bolt 3 disappears. At this time, the smoothness of the shank of the bolt 3 reaches Ra0.8, and the extrusion die 1 automatically withdraws, and the workpiece bolt is removed. 3. The extrusion process is completed.

The extrusion process of the utility model: feeding→squeezing→discharging is a cycle, and it takes about 2 to 3 seconds to complete one extrusion cycle. After the tooling is adjusted, the extrusion process is carried out continuously. Each working day is calculated as 6.5 hours, and each person and each shift can process more than 3600÷3×6.5=6800 pieces of products. Compared with the fine grinding outer circle, it has the following advantages: the quality of the squeezed product is stable, the smoothness is good, the efficiency is high, the operation is simple, and the operator's technical requirements are not high. Under normal circumstances, when a pair of extrusion dies processes products of the same length, and more than 500,000 pieces, the surface of the extrusion die may be somewhat worn. At this time, it is then ground and trimmed with an external cylindrical grinder. The corrected extrusion die can be continue to use. Extrusion dies have almost no end-of-life. Therefore, the processing cost using the extrusion process is low.

Claims (2)

1. the frock for high-strength bolt bar portion burnishing-in, it is characterized in that: form primarily of dovetail mount, burnishing-in mould and gripper shoe, burnishing-in mould is fixed on two main shafts of lathe by fishbolt, gripper shoe is arranged on and supports on panel seat, adjusting bolt is provided with between gripper shoe and support panel seat, supporting panel seat is fixedly installed on dovetail mount, between dovetail mount and support panel seat, be provided with stop iron and ferropexy bolt of stopping.

2. frock according to claim 1, is characterized in that: the minimum range between described burnishing-in mould is consistent with needing the bolt external diameter of burnishing-in.