CN1314218A

CN1314218A - Forming process for T-shaped lift rail

Info

Publication number: CN1314218A
Application number: CN 01110231
Authority: CN
Inventors: 郑集成; 初元璋; 董韧; 张云生
Original assignee: Shanxi Yuci Huayi Shape Steel Industry Co Ltd
Current assignee: Shanxi Yuci Huayi Shape Steel Industry Co Ltd
Priority date: 2001-04-02
Filing date: 2001-04-02
Publication date: 2001-09-26
Anticipated expiration: 2021-04-02
Also published as: CN1142042C

Abstract

The cold drawing forming process includes the steps of annealing, acid pickling, cold drawing, straightening, tenoning and antirust treatment; and its cold drawing may be a one-step or two-step one. The technological process has short period and low metal loss and the rail product has excellent surface quality and mechanical performance.

Description

The forming technology of T type cage guide

The present invention relates to a kind of forming technology of T type cage guide, especially relate to a kind of cold-drawn forming technology of T type cage guide.

Existing elevator T type guide rail has two kinds of processing modes promptly: cold rolling and machine cut processing.

Process and produce elevator T type guide rail in cold rolling mode, equipment complexity, investment are big, shape of product and dimensional accuracy are difficult to control.All there are not cold-rolled products both at home and abroad at present.

Produce elevator T type guide rail guide rail with the machine cut processing mode, the process-cycle is long, and metal loss is big, the cost height.It is the main processing mode that at present domestic and international cage guide processing industry still adopts.

The object of the present invention is to provide a kind of cold-drawn forming technology of T type cage guide, this technology has short, stock utilization advantages of higher of process-cycle, and the cold-drawn cage guide of being produced has excellent surface quality and good mechanical performance.

Above-mentioned purpose of the present invention realizes by following process engineering: hot rolling blank → annealing → pickling → cold-drawn → aligning → mortise → antirust processing → finished product.Described cold-drawn operation can adopt a cold-drawn to be shaped, and also can adopt the secondary cold-drawn to be shaped.Annealing temperature before the cold-drawn must be strict controlled in below the austenite phase transformation line A1 line, and is big in 650 ℃-680 ℃ scope.In annealing furnace, be cooled to 550 ℃ in insulation under this annealing temperature after about 4 hours, come out of the stove then and carry out air cooling to room temperature.Then, remove surface oxide layer by pickling.If adopt a cold-drawn, then the deflection of cold-drawn should be controlled at about 10%.If adopt the secondary cold-drawn, then the deflection of cold-drawn for the first time should be controlled at about 5%-7%, and the deflection of cold-drawn for the second time should be controlled at about 4%.In the situation that adopts the secondary cold-drawn, should carry out the annealing second time and pickling between cold-drawn for the first time and the cold-drawn for the second time.

Because T type cage guide section configuration complexity, there is some difference along the mechanical property at each position on the cross section for guide rail.The inventor discovers deflection at Cold Drawing Process middle guide head greater than waist and shank, so guide rail is easy to generate bending.In order to make guide rail in process of tube plug drawing mill, not produce bending, the deflection of metal flow rule and reasonable distribution various piece in the time of in the designing mould pass, must considering draw.In the present invention, with the mould pass be designed to mainly be head be out of shape and waist and shank deform hardly or seldom the distortion, thereby the head of blank is overstock in process of tube plug drawing mill, and metal flows to waist and shank from the head downwards, and guide rail just can be crooked like this.Simultaneously, the shape at the used hot rolling blank of draw should be such: its head leaves bigger surplus, and its waist is the same with the size of shank fundamental sum finished product.

Figure 1 shows that process chart according to T type cage guide cold-drawn forming technology of the present invention;

Figure 2 shows that the sectional drawing of the cage guide that employing T type cage guide cold-drawn forming technology of the present invention is produced.

Figure 3 shows that the mould pass figure that adopts a time cold-drawn;

Figure 4 shows that adopt two passage cold-drawns mould pass figure;

Mode with preferred embodiment is described in detail the present invention below with reference to accompanying drawings.

Embodiment 1

The material of the blank that cold-drawn is used is Q235.Adopt the square billet (or continuous casting billet) of 120 * 120mm, by the hot rolling of 9-11 passage this billet rolling is become to meet the shape and size of cold-drawing technology requirement, billet size should leave about 10% drawing deformation amount.

Before cold-drawn, to soften stress relief annealing to hot rolling steel billet, annealing temperature should 650 ℃.In annealing furnace, be cooled to 550 ℃ in insulation under this annealing temperature after about 4 hours, come out of the stove then and carry out air cooling to room temperature.Surface oxide layer is removed by pickling in the annealing back, adopts a kind of chain drawbench to carry out drawing then, and the pass of cold-drawn mould adopts the pass the same with finished form, as shown in Figure 4.Align subsequently, operation such as mortise, surface treatment is until finished product, the section configuration of finished product is as shown in Figure 2.

Embodiment 2

The material of the blank that cold-drawn is used is Q235.Adopt the square billet (or continuous casting billet) of 120 * 120mm, by the hot rolling of 9-11 passage this billet rolling is become to meet the shape and size of cold-drawing technology requirement, billet size should leave the drawing deformation amount of about 10%-15%.

Before cold-drawn, to soften stress relief annealing to hot rolling steel billet, annealing temperature should 650 ℃.In annealing furnace, be cooled to 520 ℃ in insulation under this annealing temperature after about 4 hours, come out of the stove then and carry out air cooling to room temperature.Surface oxide layer is removed by pickling in the annealing back, adopts chain drawbench to carry out two passage cold-drawns then, and the mould pass as shown in Figure 3.The drawing deformation amount that cold-drawn is for the first time finished should be controlled at about 5%～7%.Through after the cold-drawn for the first time, to carry out second time and anneal and pickling, annealing temperature should 650 ℃.In annealing furnace, be cooled to 520 ℃ in insulation under this annealing temperature after about 4 hours, come out of the stove then and carry out air cooling to room temperature.And then the deflection that carries out cold-drawn for the second time, cold-drawn for the second time is controlled at about 4%, aligns subsequently, operations such as mortise, surface treatment are until finished product.

The cold-drawing technology process-cycle of T type cage guide of the present invention is short, stock utilization is high, has realized the high-performance on the low cost.And the cold-drawn elevator T type guide rail of being produced is with low cost, and has excellent surface quality and good mechanical performance, has strengthened its security and reliability in addition, has reduced noise and energy consumption, thus make elevator real realize efficient, at a high speed and noiselessness.

Claims

1. T type cage guide forming technology may further comprise the steps:

Adopt stock of square to be rolled into T type guide rail steel billet;

Making hot rolled T type guide rail steel billet carry out the destressing soft annealing handles;

Pickling is to remove the oxide layer on surface;

Carry out cold-drawn to obtain the T type cage guide of net shape;

Resulting T type cage guide is aligned;

Carry out mortise, antirust processing then, thereby obtain finished product.

2. a T type cage guide forming technology as claimed in claim 1 is characterized in that the cold-drawn operation only adopts a time cold-drawn.

3. a T type cage guide forming technology as claimed in claim 2 is characterized in that its drawing deformation amount is about 10%.

4. a T type cage guide forming technology as claimed in claim 1 is characterized in that, the cold-drawn operation comprises that the first passage cold-drawn is shaped and the second passage cold-drawn.

5. a T type cage guide forming technology as claimed in claim 4 is characterized in that the deflection of the described first passage cold-drawn is 5%-7%.

6. a T type cage guide forming technology as claimed in claim 4 is characterized in that the deflection of the described second passage cold-drawn is about 4%.

7. one kind as claim 1,2 or 4 arbitrary described T type cage guide forming technologies, it is characterized in that, the annealing temperature before the cold-drawn must be strict controlled in below the austenite phase transformation line A1 line.

8. a T type cage guide forming technology as claimed in claim 7 is characterized in that, the annealing temperature before the cold-drawn is in 650 ℃-680 ℃ scope.

9. a T type cage guide forming technology as claimed in claim 4 is characterized in that, comprises annealing and pickling for the second time between the described first passage cold-drawn and the second passage cold-drawn.

10. a T type cage guide forming technology as claimed in claim 9 is characterized in that, described second time, annealing temperature was in 650 ℃-680 ℃ scope.