CN1022547C

CN1022547C - Production process of crowbar and its die

Info

Publication number: CN1022547C
Application number: CN 91106485
Authority: CN
Inventors: 陈家庆; 张明会; 司志厚; 司书峰; 司志荣
Original assignee: Zibo Jointly-Owned Tool Plant Shandong Machinery Import & Export Corp
Current assignee: Zibo Jointly-Owned Tool Plant Shandong Machinery Import & Export Corp
Priority date: 1991-07-20
Filing date: 1991-07-20
Publication date: 1993-10-27
Anticipated expiration: 2006-07-20
Also published as: CN1063246A

Abstract

The present invention belongs to the roll forging formation of long-shaft type objects, which mainly relates to the forming technology of crowbars. In the technology, a round bar material is used and is blanked to a certain size, then is heated to 1100-1150 DEG C; subsequently, the round bar material is made into a rhombus by one group or a plurality of groups of upper dies and lower dies which are fixed on a main shaft of a roll forging machine and have grooves; the round bar material is made into a square; then, the further 3/4-1/2 length of the rear part of the round bar material is made into a flat octagonal, and is made into a regular octagonal afterwards; finally, 1/2-1/4 length of the tail of the round bar material is made into an ellipse, and is made into a round shape afterwards. The formation process is implemented once, and therefore, heating frequency is reduced, the working environment for workers is improved, and the quality of products is raised.

Description

Production process of crowbar and its die

The present invention relates to the processing technology of major axis type objects, mainly is the production technology and the frock of crowbar.

Crowbar is the widely used hand tools of department such as railway, machinery, mine, metallurgy, building, at present, manufacturer is on the technology that crowbar is shaped both at home and abroad, mostly adopt pneumatic hammer to forge, the production technology of this open die forging is backward greatly, mainly show: 1, production efficiency is low, does not satisfy the needs in market; 2, heat often, material and energy waste are serious; 3, labour intensity is big, and workman's condition of work is abominable; 4, product cost height, profit is low.This mainly is owing to adopted the technology of blanking → heating → bat side → heating → tip shaping → heating → tip quenching → heating → eight rib shaping → heating → garden portion shaping → aligning → crop, this kind production method operation is various, as form streamline production, must take more equipment, investment is big, and aspect such as factory building also will be restricted.

The production technology that the purpose of this invention is to provide a kind of crowbar shaping reaches for this reason and the mould of design, can reduce the heating number of times, cuts down the consumption of energy, and raises labour productivity, and improves the working environment of workers, improves the quality of products.

The present invention be with major axis class steel material by the certain size blanking after, be heated 1100～1150 ℃, with on the forging roll band groove upper and lower mould, make steel material diamondwise earlier, make its quadrate again, make its rear portion 3/4～1/2 length become flat eight ribs then after, make it become positive eight ribs again, after last afterbody 1/2～1/4 length becomes ellipse garden, make it become garden shape again, then aligning, heating again, the tip is shaped, last crop.

The steel material is in forming process, and temperature is not less than 800～850 ℃, and is that continued operation is finished.

Going up the band groove garden week of garden dish type patrix and counterdie, be separately fixed on the upper and lower main shaft on the forging roll, is that difform die assembly uses together more than 1 group or 1 group during use.

The groove that patrix and counterdie form is respectively rhombus, square, flat eight ribs, positive eight ribs, ellipse garden and garden and other shape.Roll gap between the upper and lower mould is 1～3mm.Guider and locating piece are arranged on the workbench before or after the mould.

The present invention compared with prior art has:

1, production efficiency height.Produce crowbar with employing by forging process and compare, can raise labour productivity more than 3 times.

2, energy-conservation, material-saving.Free forging process need heat 4 times, could forge into crowbar, and adopts the rod forging process, only needs heating to get final product for 2 times, can fuel savings more than 50%; Economize on electricity is more than 70%, and the comparable open die forging of stock utilization improves more than 3%.

3, owing to improved labor productivity, improved stock utilization, reduced energy consumption,, improved product profit so reduced product cost.

4, reduced the factory building cost.Because being continuous static pressure, roll forging deformation is shaped, shockproof, and not high to the mill construction requirement of strength, reduced the factory building capital expenditure.

5, the good social benefit is arranged.Adopt the rod forging process to reduce workman's number,, obtained the good social benefit because shockproof and noise has improved working environment.

Describe in detail below in conjunction with die drawing of the present invention and product figure:

Fig. 1 is the front view of crowbar,

Fig. 2 is the cutaway view of rhombus mould,

Fig. 3 is the cutaway view of square mould,

Fig. 4 is the cutaway view of flat eight rib moulds,

Fig. 5 is the cutaway view of positive eight rib moulds,

Fig. 6 is the cutaway view of ellipse garden mould,

Fig. 7 is the cutaway view of garden shape mould,

Among the figure, the 1st, tip, 2 pros, 3 positive eight ribs, 4 afterbodys.

Embodiment 1:

With 45 of diameter of phi 40 ^#The garden steel, on sawing machine, be cut into one section that grows 500～550mm, it is put into heating furnace be heated to 1100～1150 ℃, before placing the mould that is fixed on the forging roll main shaft then, it is rhombus, square, flat eight ribs, positive eight rib quadruplet moulds that its mould is formed, be fixed on the D41-400 cantilevered forging roll, ellipse garden and garden shape mould are fixed on a D43-400 formula forging roll, on the workbench of each mold, guider is arranged, on the workbench before flat eight ribs, positive eight ribs, ellipse garden and garden prod cast tool locating piece is arranged.Make the steel material become prismatic earlier, be not less than under 800～850 ℃ of conditions in temperature, before again the rhombus steel material that is become being placed square mould, after making whole steel material quadrate, reserve former minister 320～340mm, its rear portion is not less than under 800～850 ℃ of conditions in temperature, enters flat eight rib moulds again, makes its rear portion become flat eight ribs, enter positive eight rib moulds then rapidly, make steel material rear portion become positive eight ribs, reserve the long 480～520mm of positive eight ribs, the positive eight rib steel material in its rear portion are not less than under 800～850 ℃ of conditions in temperature, place ellipse garden mould on the D43-400 forging roll, make afterbody become ellipse garden, place garden shape mould then rapidly, make afterbody become garden shape.Finish above-mentioned forming process, the steel material of moulding is placed alignment in the aligning mould on the straightener, and then the front end of steel material placed in the heating furnace, be heated to 1100～1150 ℃, on pneumatic hammer, with head cutting die the tip 1 of crowbar is shaped, length 1250～1350mm back-end crop on demand at last, the moulding of a crowbar is promptly accused and is finished.

Embodiment 2:

With 45 of diameter of phi 42 ^#The garden steel is cut into one section that grows 500～590mm on according to bed, it is inserted be heated to 1100～1150 ℃ in the heating furnace, and its postorder moulding process is with embodiment 1.

Embodiment 3:

With 45 of diameter of phi 50 ^#The garden steel is cut into one section that grows 520～570mm on according to bed, it is inserted be heated to 1100～1150 ℃ in the heating furnace, and its postorder moulding process is with embodiment 2.

The mould that the foregoing description is used, the material of employing can be 45 ^#Steel, hot work tool steel etc., its combination also can be adopted rhombus, and square mould is as one group, and flat eight ribs, positive eight rib tools are as one group, and ellipse garden and garden shape mould are as one group, and three groups of moulds are separately fixed on three forging rolls, form pipelining.In addition, can be according to the length of the power and the main shaft of forging roll, otherwise assembling die.

Claims

1, a kind of crowbar production technology, major axis class steel material pressed the certain size blanking after, be heated 1100-1150 ℃, the back aligning that is shaped, heating again is shaped its tip, last crop; It is characterized in that: forming process is with the upper and lower mould of band groove on the forging roll, makes steel material diamondwise earlier, makes its quadrate again, after making its rear portion 3/4-1/2 length become flat eight ribs then, make it become positive eight ribs again, last afterbody 1/2-1/4 length becomes ellipse garden, makes it circular again.

2, the technology of crowbar production according to claim 1, it is characterized in that: in the steel material forming process, temperature is not less than 800-850 ℃.

3, a kind of crowbar shaping dies, comprise: garden dish type patrix and counterdie, be with groove on the circumference of upper and lower mould, upper die and lower die be separately fixed at forging roll on, on the lower main axis, and be that difform die assembly uses more than 1 group or 1 group together, it is characterized in that: the groove that upper die and lower die form is respectively rhombus, square, flat eight ribs, positive eight ribs, ellipse garden and circle and other shape.