Variable-diameter cylindrical grinder mandrel
By setting an adjustable conical positioning frame on the grinding machine spindle, the adaptability of various parts for external cylindrical grinding is realized, production costs are reduced, and the problem of the limited applicability of the center shaft in existing technologies is solved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGLU MACHINERY & ELECTRONICS GROUP
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-12
AI Technical Summary
In the existing technology, the application range of variable diameter mandrels for external cylindrical grinding is limited when producing a variety of parts, resulting in high production costs.
Design a variable diameter cylindrical grinding machine spindle by setting several axially extending supports on the outer circumference of the support frame spindle, and installing an adjustable conical positioning frame on each support. Locking bolts are used to lock the conical positioning frame and change its radial extension and retraction, so as to adapt to products with different inner hole diameters or large diameters of internal splines.
This expands the application range of the mandrel, reduces production costs, and improves processing flexibility and adaptability.
Smart Images
Figure CN224347642U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a variable diameter cylindrical grinding machine spindle. Background Technology
[0002] In external cylindrical grinding, the inner diameter or the major diameter of the internal spline is generally used for positioning. To reduce the clearance, a 1:3000 taper surface is typically used. When the inner diameter or major diameter of the internal spline of product A enters the tapered mandrel B, the closer to the large end, the smaller the clearance. When tightly fitted to the fixture, the clearance is "0". Figure 1 As shown; the disadvantage is that products with the same inner diameter or the major diameter of the internal spline are only suitable for one taper mandrel, which results in higher production costs for manufacturers of multiple types of parts. Summary of the Invention
[0003] To solve the above-mentioned technical problems, this utility model provides a variable diameter cylindrical grinding machine spindle with simple structure and wide applicability.
[0004] The technical solution of this utility model to solve the above-mentioned technical problems is: a variable diameter cylindrical grinding machine spindle, including a support frame spindle, a conical positioning frame, and a locking bolt. The support frame spindle is installed on the grinding machine. The outer circumference of the support frame spindle is provided with a number of axially extending brackets. A number of mounting holes with a set height are evenly distributed on the brackets. A locking bolt is provided in each mounting hole. A conical positioning frame is provided on each bracket. The conical positioning frame is fastened to the bracket by the locking bolt, and the locking position of the locking bolt in the mounting hole is adjustable.
[0005] The aforementioned variable diameter cylindrical grinding machine spindle includes a conical positioning frame comprising an arc-shaped plate. The bottom center of the arc-shaped plate has an inwardly recessed groove that matches the size of the support. Several through holes are evenly distributed on both sides of the groove wall. Locking bolts pass through the through holes and mounting holes to fix the conical positioning frame to the support.
[0006] In the aforementioned variable-diameter cylindrical grinding machine spindle, the positions of the through holes and mounting holes correspond.
[0007] The aforementioned variable diameter cylindrical grinding machine spindle has four supports, which are distributed at 90° around the outer circumference of the support frame spindle.
[0008] The aforementioned variable diameter cylindrical grinding machine spindle has three supports, which are distributed at 120° around the outer circumference of the support frame spindle.
[0009] The beneficial effects of this utility model are as follows: This utility model has several axially extending brackets on the outer circumference of the support frame spindle, and a conical positioning bracket is correspondingly set on each bracket. The conical positioning bracket can be locked and fixed on a support frame spindle. After being unlocked, the conical positioning bracket can be radially extended and re-locked. When the radial dimension changes, it can be adapted to products with another inner diameter or inner spline large diameter, and has a wide range of applications. Attached Figure Description
[0010] Figure 1 This is a schematic diagram for assembling and using a tapered mandrel.
[0011] Figure 2 This is a schematic diagram of the structure of this utility model.
[0012] Figure 3 When the number of stents is 4, in the fully contracted state Figure 2 AA sectional view.
[0013] Figure 4 When the number of supports is 4, in the fully open state Figure 2 AA sectional view.
[0014] Figure 5 When the number of stents is 3, in the fully contracted state Figure 2 AA sectional view.
[0015] Figure 6 When the number of supports is 3, in the fully open state Figure 2 AA sectional view.
[0016] Figure 7 for Figure 3 Enlarged image.
[0017] Figure 8 This is a schematic diagram of the support frame mandrel.
[0018] Figure 9 This is a schematic diagram of the conical positioning frame. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] like Figures 2-8As shown, a variable diameter cylindrical grinding machine spindle includes a support frame spindle 1, a conical positioning frame 2, and locking bolts 3. The support frame spindle 1 is mounted on the grinding machine. The outer circumference of the support frame spindle 1 is provided with a plurality of axially extending brackets 4. A plurality of mounting holes 5 with a set height are evenly distributed on the brackets 4. A locking bolt 3 is provided in each mounting hole 5. A conical positioning frame 2 is correspondingly provided on each bracket 4. The conical positioning frame 2 is fastened to the bracket 4 by the locking bolts 3, and the locking position of the locking bolts 3 in the mounting holes 5 is adjustable.
[0021] like Figure 9 As shown, the conical positioning frame 2 includes an arc-shaped plate 6. The bottom center of the arc-shaped plate 6 has an inwardly recessed groove 7 that matches the size of the bracket 4. Several through holes 8 are evenly distributed on both sides of the groove wall of the groove 7. The positions of the through holes 8 and the mounting holes 5 are corresponding. The locking bolts 3 pass through the through holes 8 and the mounting holes 5 to fix the conical positioning frame 2 to the bracket 4.
[0022] like Figure 3 , Figure 4 As shown, there are four supports 4, which are distributed at 90° to each other on the outer circumference of the support frame spindle 1.
[0023] like Figure 5 , Figure 6 As shown, the number of brackets 4 can also be 3, with the 3 brackets 4 distributed at 120° on the outer circumference of the support frame spindle 1.
[0024] The conical positioning frame 2 of this utility model can be locked and fixed on a support frame spindle 1. After being unlocked, the conical positioning frame 2 can be radially extended and re-locked. When the radial dimension changes, it can be adapted to products with another inner diameter or inner spline major diameter.
[0025] When using this utility model, please note the following: First, adjust the outer diameter of the radially expandable conical surface (large end diameter of the conical surface = product positioning inner diameter + 0.3mm) according to the inner diameter or major diameter of the internal spline of the product, and then slightly tighten the locking bolt 3. The second step is to place the mandrel on the grinding machine, ensuring that the end centers of the machine are against the center holes at both ends of the mandrel. Rotate the mandrel and use a dial indicator to check the runout of the positioning surfaces of the radially expandable conical positioning bracket 2. The runout of each positioning surface should be less than 0.015mm. Then lock each conical positioning bracket 2 to complete the mandrel size adjustment. When using the mandrel, ensure that each conical positioning bracket 2 is locked securely; loosening during processing is not allowed.
Claims
1. A variable diameter cylindrical grinding machine spindle, characterized in that: The device includes a support frame spindle, a conical positioning bracket, and locking bolts. The support frame spindle is mounted on a grinding machine. The outer circumference of the support frame spindle has several axially extending brackets. Several mounting holes with a set height are evenly distributed on the brackets. A locking bolt is installed in each mounting hole. A conical positioning bracket is installed on each bracket. The conical positioning bracket is fastened to the bracket by the locking bolts, and the locking position of the locking bolts in the mounting holes is adjustable.
2. The variable diameter cylindrical grinding machine spindle according to claim 1, characterized in that: The conical positioning frame includes an arc-shaped plate. The bottom center of the arc-shaped plate has an inwardly recessed groove that matches the size of the support. Several through holes are evenly distributed on both sides of the groove wall. Locking bolts pass through the through holes and mounting holes to fix the conical positioning frame to the support.
3. The variable diameter cylindrical grinding machine spindle according to claim 2, characterized in that: The positions of the through holes and mounting holes correspond to each other.
4. The variable diameter cylindrical grinding machine spindle according to claim 1, characterized in that: The number of supports is 4, and the 4 supports are distributed at 90° on the outer circumference of the support frame mandrel.
5. The variable diameter cylindrical grinding machine spindle according to claim 1, characterized in that: The number of supports is 3, and the 3 supports are distributed at 120° on the outer circumference of the support frame mandrel.