CN211727771U

CN211727771U - Steering gear rack adds clamping apparatus

Info

Publication number: CN211727771U
Application number: CN201922442660.6U
Authority: CN
Inventors: 汤晹
Original assignee: Shanghai Koal Automobile Technology Development Co ltd
Current assignee: Shanghai Koal Automobile Technology Development Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-23
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a steering gear rack machining clamp, which comprises a fixed seat (1), a jacking device (2), an end face positioning device (3) and a pressing block (4), wherein the jacking device (2) and the end face positioning device (3) are respectively positioned at two sides of the fixed seat (1), and the pressing block (4) is arranged on the fixed seat (1); a workpiece (5) to be machined is arranged on the fixed seat (1), two sides of the workpiece (5) to be machined are pressed tightly through the pressing block (4), and two ends of the workpiece (5) to be machined are clamped tightly through the jacking device (2) and the end face positioning device (3). Compared with the prior art, the utility model has the advantages of the precision is high, the uniformity is good, with low costs.

Description

Steering gear rack adds clamping apparatus

Technical Field

The utility model belongs to the technical field of automobile parts and specifically relates to a add clamping apparatus of steering gear rack is related to.

Background

The steering gear is a mechanical device which is driven by people or unmanned and has a power source, so that the steering gear randomly changes the running route and direction during running. A rack and pinion steering gear, which is the most common type of steering gear, has a basic structure of a pair of pinion gears and a rack gear which are engaged with each other. When the steering shaft drives the pinion to rotate, the rack moves linearly. Sometimes, the steering wheel can be steered by directly driving the tie rod by the rack. This is therefore the simplest steering gear. The rack and pinion steering gear has the advantages of simple structure, low cost, sensitive steering and small volume, and can directly drive the tie rod, thereby being widely applied to automobiles at present.

In the domestic automobile steering gear market, along with the fierce market competition of the steering gear, the steering gear enterprises continuously improve the product quality requirements and have high-requirement first-time qualification rate indexes, a steering gear rack is an important component of a gear rack steering gear, the precision requirement of the rack is firstly pressed and then pressed, the requirements and the range of the consistency and the trend of the cross-rod distance of the rack are higher and higher, the current main tooth type processing mode is tooth milling and tooth pulling, but the tooth milling processing mode is complex in adjustment and change, the consistency is unstable, the tooth type and the cross-rod distance trend are influenced by the heat expansion and cold contraction of a cutter, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a steering gear rack adds clamping apparatus that the uniformity is stable, with low costs in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme: the steering gear rack machining clamp is characterized by comprising a fixed seat (1), a jacking device (2), an end face positioning device (3) and a pressing block (4), wherein the jacking device (2) and the end face positioning device (3) are respectively positioned on two sides of the fixed seat (1), and the pressing block (4) is arranged on the fixed seat (1); a workpiece (5) to be machined is arranged on the fixed seat (1), two sides of the workpiece (5) to be machined are pressed tightly through the pressing block (4), and two ends of the workpiece (5) to be machined are clamped tightly through the jacking device (2) and the end face positioning device (3).

The processing fixture is characterized in that a plurality of pressing blocks (4) which are arranged in parallel are arranged on the fixing seat (1), and a workpiece (5) to be processed is fixed between every two adjacent pressing blocks (4).

Fixing base (1) one side still be equipped with two at least parallel arrangement's triangular supports frame (11), a right angle limit of this triangular supports frame (11) is fixed on fixing base (1), be equipped with supporting beam (12) on another right angle limit tip, work piece (5) of waiting to process are held up jointly with fixing base (1) in this supporting beam (12).

The pressing block (4) comprises an end face pressing block (41) and a middle pressing block (42), wherein one side face of the end face pressing block (41) is an arc surface or is step-shaped; two opposite side surfaces of the middle pressing block (42) are arc surfaces or step-shaped, wherein the radius of the arc surfaces is matched with the workpiece (5) to be processed. The pressing block (4) is of a structure capable of being pulled upwards or downwards, a stretching rod is arranged at the bottom of the pressing block, a positioning groove and a fixing block are arranged on the top surface of a corresponding fixing seat, the pressing block is pulled up before processing, and after a workpiece to be processed is placed in the pressing block, the pressing block is pressed downwards and fixed.

The jacking device (2) comprises a clamping curved bar (21), an expansion link (22) and a hydraulic oil cylinder (23), wherein the hydraulic oil cylinder is connected with the bottom of the clamping curved bar (21) through the expansion link (22), and the clamping curved bar (21) is abutted to the end face of the workpiece (5) to be processed.

The end part of the telescopic rod (22) is provided with a fixing clamp, a rotating shaft is arranged in the fixing clamp, and the clamping bent rod (21) can rotate around the rotating shaft and is positioned through the fixing clamp.

The jacking device (2) further comprises a base (24) and a rotating platform (25) arranged on the base, one end of the hydraulic oil cylinder (23) is fixed on the rotating platform (25), and the other end of the hydraulic oil cylinder is connected with the telescopic rod (22).

The end face positioning device (3) is in a square shape, a groove (31) is formed in one corner of the end face positioning device, and the end face of the workpiece (5) to be machined is positioned through the groove (31).

The included angle a between the two side surfaces and the bottom surface of the groove (31) is as follows: 90 < a < 180.

The method for machining the steering gear rack by adopting the system with the clamp comprises the following steps:

(1) placing a workpiece (5) to be processed on the fixed seat (1), enabling one end of the workpiece to abut against the end face positioning device (3), and positioning the workpiece through the end face positioning device (3);

(2) the other end face of the workpiece (5) to be processed is clamped through the jacking device (2);

(3) pressing down the pressing block (4) to fix two sides of a workpiece (5) to be processed;

(4) and (3) finishing the surface shape of the grinding wheel by adopting a diamond roller to enable the grinding wheel to have a shape opposite to the required rack tooth shape, and grinding the finished grinding wheel to form the rack tooth shape on the fixed workpiece (5) to be processed.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. but place the lead screw polished rod of pivot on the fixing base, both ends are pressed from both sides tightly fixedly through tight device in top and terminal surface positioner to compress tightly the side through the briquetting, wherein terminal surface positioner is equipped with the recess for the location, also is equipped with special locating surface on the briquetting, and all-round fixed lead screw prevents that the lead screw from rotating in the course of working.

2. The multi-screw-rod synchronous machining device is characterized in that multiple groups of pressing blocks, corresponding jacking devices and end face positioning devices are arranged on the same fixing seat, multiple screw rods can be placed at one time, a machining beat is short, multiple racks can be machined simultaneously, and the rack tooth shapes and the cross-rod distance trend are good in consistency.

3. Before processing, the grinding wheel and the roller wheel rotate at a high speed at the same time, the grinding wheel descends at a low speed and contacts with the roller wheel to finish the surface shape of the grinding wheel, and the high hardness and strength of the diamond roller wheel are utilized to form a shape opposite to that of the roller wheel on the surface of the grinding wheel, so that the processing precision of the rack is greatly improved.

4. Compared with the gear milling, the gear milling machine has the advantages of good roughness of the tooth surface and higher tooth profile precision, can meet various high-precision requirements of customers, and is suitable for mass production.

5. Long service life, low cost, short remodeling time and market competitiveness.

Drawings

FIG. 1 is a schematic structural view of the clamp of the present invention;

FIG. 2 is a schematic view of the diamond roller dressing grinding wheel of the present invention;

fig. 3 is a sectional view of the diamond roller.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

As shown in fig. 1, a steering gear rack machining clamp comprises a fixed seat 1, a jacking device 2, an end face positioning device 3 and a pressing block 4, wherein the jacking device 2 and the end face positioning device 3 are respectively positioned at two sides of the fixed seat 1, and the pressing block 4 is arranged on the fixed seat 1; the workpiece 5 to be processed is placed on the fixed seat 1, two sides of the workpiece 5 to be processed are pressed tightly through the pressing block 4, and two ends of the workpiece 5 to be processed are clamped tightly through the jacking device 2 and the end face positioning device 3.

The fixed seat 1 is provided with a plurality of pressing blocks 4 which are arranged in parallel, and a workpiece 5 to be processed is fixed between every two adjacent pressing blocks 4. Fixing base 1 one side still be equipped with two at least parallel arrangement's triangular supports 11, a right angle limit of this triangular supports 11 is fixed on fixing base 1, is equipped with supporting beam 12 on another right angle limit tip, this supporting beam 12 holds up work piece 5 of treating with fixing base 1 jointly.

The pressing block 4 comprises an end face pressing block 41 and a middle pressing block 42, wherein one side face of the end face pressing block 41 is an arc face or is step-shaped; two opposite side surfaces of the middle pressing block 42 are arc surfaces or step-shaped, wherein the radius of the arc surfaces is matched with the workpiece 5 to be processed. Briquetting 4 is for can drawing up or pushing down the structure, and its bottom is equipped with tensile pole, and the fixing base top surface that corresponds is equipped with constant head tank and fixed block, pulls up the briquetting before the processing, puts into and treats behind the processing work piece, pushes down the briquetting and fixes, and the non-machined surface of treating the processing work piece is lived in the side parcel through briquetting 4 to the aim at, places it and rotates in the course of working.

The jacking device 2 comprises a clamping curved bar 21, an expansion link 22, a hydraulic oil cylinder 23, a base 24 and a rotating platform 25 arranged on the base, wherein the hydraulic oil cylinder is connected with the bottom of the clamping curved bar 21 through the expansion link 22, and the clamping curved bar 21 is abutted against the end face of the workpiece 5 to be processed. The end part of the telescopic rod 22 is provided with a fixing clamp, a rotating shaft is arranged in the fixing clamp, and the clamping bent rod 21 can rotate around the rotating shaft and is positioned through the fixing clamp. One end of the hydraulic oil cylinder 23 is fixed on the rotating platform 25, and the other end is connected with the telescopic rod 22.

The end face positioning device 3 is in a square shape, a groove 31 is formed in one corner of the end face positioning device, and the end face of the workpiece 5 to be processed is positioned through the groove 31. The included angle a between the two side surfaces and the bottom surface of the groove 31 is as follows: 90 < a <180, the side faces may be straight or curved, in order that the workpiece to be machined can be inserted into the groove 31, and is difficult to rotate after insertion.

1, a workpiece 5 to be processed is placed on a fixed seat 1, one end of the workpiece abuts against an end face positioning device 3, and the workpiece is positioned through the end face positioning device 3;

2, clamping the other end face of the workpiece 5 to be processed through the jacking device 2;

3, pressing down the pressing block 4 to fix two sides of a workpiece 5 to be processed;

4, the grinding wheel and the diamond roller rotate at high speed simultaneously, the grinding wheel descends at low speed to contact with the diamond roller to finish the surface shape of the grinding wheel, the surface shape of the grinding wheel is finished by the diamond roller to enable the surface shape of the grinding wheel to be opposite to the required rack tooth shape, and the finished grinding wheel grinds and processes the fixed workpiece 5 to be processed to form a rack tooth shape 6. (as shown in FIGS. 2 to 3)

Through above-mentioned device, can once only process 2 ~ 6 racks, efficient, the precision is high, the uniformity is stable.

Claims

1. The steering gear rack machining clamp is characterized by comprising a fixed seat (1), a jacking device (2), an end face positioning device (3) and a pressing block (4), wherein the jacking device (2) and the end face positioning device (3) are respectively positioned on two sides of the fixed seat (1), and the pressing block (4) is arranged on the fixed seat (1); a workpiece (5) to be machined is arranged on the fixed seat (1), two sides of the workpiece (5) to be machined are pressed tightly through the pressing block (4), and two ends of the workpiece (5) to be machined are clamped tightly through the jacking device (2) and the end face positioning device (3).

2. The steering gear rack machining clamp according to claim 1 is characterized in that a plurality of pressing blocks (4) which are arranged in parallel are arranged on the fixing seat (1), and a workpiece (5) to be machined is fixed between every two adjacent pressing blocks (4).

3. The steering gear rack machining clamp according to claim 1, characterized in that at least two triangular support frames (11) arranged in parallel are further arranged on one side of the fixing base (1), one right-angle side of each triangular support frame (11) is fixed on the fixing base (1), a supporting cross beam (12) is arranged at the end of the other right-angle side, and the supporting cross beam (12) and the fixing base (1) jointly support a workpiece (5) to be machined.

4. The steering rack machining clamp according to claim 1, characterized in that the pressing block (4) comprises an end face pressing block (41) and a middle pressing block (42), wherein one side face of the end face pressing block (41) is a circular arc face or is step-shaped; two opposite side surfaces of the middle pressing block (42) are arc surfaces or step-shaped, wherein the radius of the arc surfaces is matched with the workpiece (5) to be processed.

5. The steering gear rack machining clamp according to claim 1 is characterized in that the jacking device (2) comprises a clamping curved rod (21), an expansion rod (22) and a hydraulic oil cylinder (23), the hydraulic oil cylinder is connected with the bottom of the clamping curved rod (21) through the expansion rod (22), and the clamping curved rod (21) abuts against the end face of a workpiece (5) to be machined.

6. The steering rack machining jig as claimed in claim 5, wherein the end of the telescopic rod (22) is provided with a fixing clamp, a rotating shaft is arranged in the fixing clamp, and the clamping curved rod (21) can rotate around the rotating shaft and is positioned through the fixing clamp.

7. The steering gear rack machining clamp according to claim 5, wherein the jacking device (2) further comprises a base (24) and a rotating platform (25) arranged on the base, one end of the hydraulic oil cylinder (23) is fixed on the rotating platform (25), and the other end of the hydraulic oil cylinder is connected with the telescopic rod (22).

8. A steering rack machining jig according to claim 1, characterized in that the end face positioning means (3) is in the form of a block and is provided with a groove (31) at one corner thereof, and the end face of the workpiece (5) to be machined is positioned by the groove (31).

9. The steering rack machining clamp according to claim 8, wherein the included angle a between the two side surfaces and the bottom surface of the groove (31) is as follows: 90 < a < 180.