CN114682814A - Drilling process for steering column input shaft - Google Patents

Abstract

The invention relates to the technical field of steering system preparation, in particular to a drilling process for an input shaft of a steering column, comprising the steps of: centering, first feeding, first withdrawing, and second feeding , the second retraction, the third advance, and the third retraction. Compared with the prior art, the present invention designs a process route of feeding and retracting the tool three times, and cooperates with the selection of drilling tools, the feeding speed, the spindle speed, and the setting of the lubrication amount, so as to solve the problem of the quality of the inner wall of the hole during the drilling process. The problem of cutting iron scraps in drilling has improved the drilling quality, improved the qualified rate of drilling sales, accelerated the production tact, and improved the production efficiency, with clear logic and high stability.

Description

A drilling process for steering column input shaft

technical field

The invention relates to the technical field of steering system preparation, in particular to a drilling process for an input shaft of a steering column.

Background technique

When assembling the steering column of the automobile steering system, the input shaft and the torsion bar need to be drilled and pinned to fix the input shaft and the torsion bar.

At present, in the existing drilling process, the drilling quality is relatively poor, which directly affects the pass rate of the pressing pin in the next process; in the drilling process, the generated iron filings cannot be removed in time, which will cause a long A condition in which machining waste wraps around the drill bit and scratches the workpiece.

The quality of the drilling process directly determines the pass rate of pinning, and because the input shaft and the torsion bar have different strengths and hardnesses, how to ensure the stability of the drilling process quality, thereby ensuring the quality of the products after the press-fitting is completed, and reducing the pressure Pin failure rate, reducing the number of repeated pin selection to speed up the production cycle, and improving production efficiency are the keys to the current drilling and sales process.

Therefore, it is necessary to design a drilling process for the input shaft of the steering column to improve the drilling quality and improve the qualified rate of drilling and pinning.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a drilling process for the input shaft of the steering column, so as to improve the drilling quality and improve the qualified rate of drilling and pinning.

In order to achieve the above purpose, the present invention is a drilling process for the input shaft of a steering column, which includes the following steps: Step 1, centering: the drill bit of the tool is at a distance of -1mm from the starting point on one side of the input shaft, at a distance of 2mm/ The centering feed rate of s is fed to the side of the input shaft within 1mm from the starting point, and the drill bit of the tool stays on the side of the input shaft.

Step 2, the first feed: from the side of the input shaft at a distance of 1mm from the starting point, feed at a feed rate of 8mm/s to the torsion bar at a distance of 6mm from the starting point, and the drill bit of the tool stays at the position of the torsion bar.

Step 3, the first tool retraction: from the inside distance of the torsion bar 6mm from the starting point, feed the tool with a retraction feed rate of 8mm/s to the side of the input shaft within 1mm from the starting point, and the drill bit of the tool stays on the side of the input shaft Location.

Step 4, the second feed: from one side of the input shaft at a distance of 1mm from the starting point, feed at a feed rate of 8mm/s to the other side of the input shaft at a distance of 14mm from the starting point, and the drill bit of the tool stays at the input position on the other side of the shaft.

Step 5, the second tool retraction: from the other side of the input shaft at a distance of 14mm from the starting point, feed the tool at a retraction feed rate of 8mm/s to a point where the inside distance from the torsion bar is 7mm from the starting point, and the drill bit of the tool stays at the torsion bar position .

Step 6, the third feed: from the inner distance of the torsion bar 7mm from the starting point, feed at a feed rate of 8mm/s to the other side of the input shaft at an outer distance of 18mm from the starting point, and the drill bit of the tool stays outside the workpiece.

Step 7, the third tool retraction: from the other side of the input shaft at a distance of 18mm from the starting point, feed the tool at a retraction feed rate of 10mm/s to the distance from the start point on one side of the input shaft -2mm, and the drill bit of the tool stays at outside the workpiece.

The cutting tool is a cemented carbide step drill.

The cemented carbide step drill is a two-edged type.

The surface of the cemented carbide step drill is provided with a Cr-based composite multi-layer coating, which improves the hardness of the drill bit.

Said centering depth is 1 mm.

The tool is fixed on the spindle.

The spindle speed is 3550r/min.

The main shaft is provided with a lubrication quantity, and the lubrication quantity is controlled by a pressure valve, and the pressure of the pressure valve is 2.4 bar.

Compared with the prior art, the present invention designs a process route of feeding and retracting the tool three times, and cooperates with the selection of drilling tools, the feeding speed, the spindle speed, and the setting of the lubrication amount, so as to solve the problem of the quality of the inner wall of the hole during the drilling process. The problem of cutting iron scraps in drilling has improved the drilling quality, improved the qualified rate of drilling sales, accelerated the production cycle, improved production efficiency, clear logic and high stability.

Description of drawings

FIG. 1 is a schematic diagram of the drilling process of the present invention.

Figure 2 is a schematic diagram of the drilling tool used in the present invention.

Detailed ways

The present invention will now be further described with reference to the accompanying drawings.

Referring to Figure 1, the present invention is a drilling process for the input shaft of a steering column, comprising the following steps:

Step 1, centering: the drill bit of the tool is fed from the starting point -1mm on the side of input shaft 1, at a centering feed rate of 2mm/s to the point where the distance from the starting point on the side of input shaft 1 is 1mm, and the drill bit of the tool stops on the input shaft side.

Step 2, the first feed: from the input shaft 1 side within 1mm from the starting point, feed at a feed rate of 8mm/s to the torsion bar 2 within 6mm from the starting point, and the drill bit of the tool stays on the torsion bar Location.

Step 3, the first tool retraction: from the inner distance of the torsion bar 2 6mm from the starting point, feed the tool to the input shaft 1 side at an inner distance of 1mm from the starting point at a retraction feed rate of 8mm/s, and the drill bit of the tool stays on the input axis side position.

Step 4, the second feed: from one side of input shaft 1 1mm from the starting point, feed at a feed rate of 8mm/s to the other side of input shaft 1 at a distance of 14mm from the starting point, and the drill bit of the tool stops on the other side of the input shaft.

Step 5, the second tool retraction: from the other side of the input shaft 1, 14mm from the starting point, feed the tool at the retraction feed rate of 8mm/s to the torsion bar 2, which is 7mm from the starting point, and the drill bit of the tool stays at the torsion bar. rod position.

Step 6, the third feed: from the inner distance of the torsion bar 2 7mm from the starting point, feed at a feed rate of 8mm/s to the other side of the input shaft 1 at an outer distance of 18mm from the starting point, and the drill bit of the tool stays on the workpiece outside.

Step 7, the third tool retraction: from the other side of the input shaft 1 at a distance of 18mm from the starting point, feed the tool at a retraction feed rate of 10mm/s to the distance from the start point on one side of the input shaft 1 -2mm, the drill bit of the tool Stay outside the workpiece.

The two retracting actions are set at the place where the torsion bar 2 and the input shaft 1 cooperate, so as to ensure the drilling quality at the place where the input shaft 1 and the torsion bar 2 cooperate.

The feed speed is reduced on the basis of the theoretical calculation of the spindle speed to ensure the drilling quality and improve the life of the drill bit.

Referring to Figure 2, in the present invention, the tool is a cemented carbide step drill, the cemented carbide step drill is a two-edged type, and the surface of the cemented carbide step drill is provided with a Cr-based composite multi-layer coating to improve the hardness of the drill bit to ensure drilling. quality.

In the present invention, the centering depth is 1 mm.

In the present invention, the tool is fixed on the spindle. The spindle speed is 3550r/min. The spindle speed mainly affects the drilling quality and indirectly determines the feed rate. The main shaft is set with a lubrication amount, which is controlled by a pressure valve, and the pressure of the pressure valve is 2.4bar. The pressure of the pressure valve determines the amount of lubricating oil. If the amount is small, there will be problems such as excessive drilling resistance and excessive processing temperature, which will affect the drilling quality and drill life;

The invention designs a process route of three times of feeding and withdrawing, and cooperates with the selection of drilling tools, the setting of feeding speed, spindle speed and lubrication amount, so as to solve the problem of the quality of the inner wall of the hole and the problem of cutting iron scraps during the drilling process , Improve the drilling quality, improve the qualified rate of drilling sales, speed up the production cycle, improve production efficiency, clear logic and high stability.

Claims (8)

1. A drilling process for an input shaft of a steering column, characterized in that it comprises the following steps: Step 1, centering: the drill bit of the tool is at a distance of -1 mm from the starting point on one side of the input shaft (1), and is 2 mm The centering feed rate of /s is fed to the input shaft (1) side within 1mm from the starting point, and the drill bit of the tool stays at the position on the input shaft side; Step 2, the first feed: from the input shaft (1) One side is 1mm away from the starting point, and the feed rate is 8mm/s to the torsion bar (2), which is 6mm away from the starting point, and the drill bit of the tool stays at the torsion bar position; Step 3, the first retraction: From the point where the torsion bar (2) is 6mm away from the starting point, the feed rate is 8mm/s at the retraction feed rate to the side of the input shaft (1) which is 1mm away from the starting point, and the drill bit of the tool stays on the side of the input shaft; Steps 4. The second feed: From the position of 1mm from the starting point on one side of the input shaft (1), the tool feeds at a feed rate of 8mm/s to the position on the other side of the input shaft (1), which is 14mm from the starting point. The drill bit stays at the position on the other side of the input shaft; Step 5, the second retraction: from the other side of the input shaft (1) 14mm away from the starting point, feed to the torsion bar at a retraction feed rate of 8mm/s (2) At a distance of 7mm from the starting point, the drill bit of the tool stays at the position of the torsion bar; Step 6, the third feed: from the torsion bar (2) at a distance of 7mm from the starting point, feed at a feed rate of 8mm/s Feed to the other side of the input shaft (1) at a distance of 18mm from the starting point, and the drill bit of the tool stays outside the workpiece; Step 7, the third retraction: from the other side of the input shaft (1) at a distance of 18mm from the starting point, take 10mm The tool retracting feed rate of /s is fed to the side of the input shaft (1) at a distance of -2mm from the starting point, and the drill bit of the tool stays outside the workpiece. 2 . The drilling process for the input shaft of a steering column according to claim 1 , wherein the tool is a cemented carbide step drill. 3 . 3 . The drilling process for steering column input shaft according to claim 2 , wherein the cemented carbide step drill is a double-edged type. 4 . 4 . The drilling process for the input shaft of a steering column according to claim 2 , wherein the surface of the cemented carbide step drill is provided with a Cr-based composite multi-layer coating to improve the hardness of the drill bit. 5 . 5 . The drilling process for steering column input shaft according to claim 2 , wherein the centering depth is 1 mm. 6 . 6. The drilling process for the input shaft of a steering column according to claim 1, wherein the tool is fixed on the main shaft. 7 . The drilling process for the input shaft of a steering column according to claim 6 , wherein the rotational speed of the main shaft is 3550 r/min. 8 . 8 . The drilling process for a steering column input shaft according to claim 6 , wherein the main shaft is provided with a lubrication quantity, and the lubrication quantity is controlled by a pressure valve, and the pressure of the pressure valve is 2.4 bar. 9 .

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