CN203045521U - Cylinder part external grinding jig - Google Patents

Abstract

The utility model belongs to the design technology of jigs, and relates to a jig for grinding outer circles of cylindrical parts . It is characterized in that it consists of a mandrel [1], an expansion cylinder [2] and a nut [3]; the mandrel [1] is connected by an optical axis section [1a], a circular platform section [1b] and a thread section [1c] composed of step shafts, the expansion cylinder [2] is a cylinder with an open left port, the diameter of the outer cylindrical surface of the expansion cylinder [2] is matched with the inner hole clearance of the cylindrical part [4] to be ground, the expansion cylinder [2] ] set on the circular platform section [1b] of the mandrel [1], the right end of the threaded section [1c] protrudes from the center hole on the right end surface of the expansion cylinder [2] and engages with the nut [3], in the expansion cylinder [2] ] has a blind groove [2c] on the outer cylindrical surface. The utility model has universality for cylindrical parts with different inner diameters, reduces the number of clamps and reduces the processing cost.

Description

A kind of jig for grinding outer circle of cylindrical parts

technical field

The utility model belongs to the design technology of tool fixtures, and relates to a positioning fixture for grinding outer circles of cylindrical parts.

Background technique

In the field of mechanical processing, it is necessary to process cylindrical parts. Because the inner wall of cylindrical parts is thin, the method of clamping the outer circle is easy to cause the clamping deformation of the part. Although the method of clamping the end face can prevent the deformation of the part caused by clamping , but the radial force on the part during turning and grinding will still cause the processing deformation of the part. Therefore, the fixture generally adopts the internal expansion clamping method. A current cylindrical part uses a tapered mandrel for positioning. The disadvantages are that the mandrel has no versatility, each part needs a special mandrel, and the number of fixtures is large, which increases the manufacturing cost.

Contents of the invention

The purpose of the utility model is to propose a universal positioning fixture for grinding the outer circle of cylindrical parts, so as to reduce the number of fixtures and reduce the processing cost.

The technical scheme of the utility model is: a cylindrical part grinding outer circle fixture, which is characterized in that it is composed of a mandrel 1, an expansion cylinder 2 and a nut 3; the mandrel 1 is a stepped shaft, and from left to right are The optical axis section 1a, the circular platform section 1b and the threaded section 1c, the outer diameter of the optical axis section 1a is larger than the inner hole diameter of the cylindrical part 4 to be ground, and smaller than the outer diameter of the cylindrical part 4 to be ground. The left end surface of section 1a has a central positioning hole 1d, the diameter of the left end of the circular platform section 1b is larger than the diameter of the right end, the diameter of the left end of the circular platform section 1b is smaller than the diameter of the optical axis section 1a, and the left end of the circular platform section 1b is coaxially connected with the right end of the optical axis section 1a , the cone angle α=12°～30° of the truncated truncated section 1b, the axial length of the truncated truncated section 1b is not less than the length of the cylindrical part 4 to be ground, the left end of the threaded section 1c is coaxially connected with the right end of the truncated truncated section 1b, and The right end surface of the threaded section 1c has a central positioning hole 1e for the threaded section. The expansion cylinder 2 is a cylinder with an open left port. The inner cavity of the cylinder 2 is a truncated conical inner cavity 2a, the cone angle of the truncated conical inner cavity 2a is α, and the maximum inner diameter of the truncated conical inner cavity 2a is greater than the middle diameter of the mandrel 1 conical frustum section 1b and smaller than the diameter of the mandrel 1 conical frustum section 1b The maximum diameter, the minimum diameter of the frustum-shaped inner cavity 2a is smaller than the minimum diameter of the frustum section 1b of the mandrel 1, the expansion cylinder 2 is set on the frustum section 1b of the mandrel 1, the frustum-shaped inner cavity 2a of the expansion cylinder 2 is in contact with the frustum of the mandrel 1 The round table surface of section 1b fits together, and there is a central hole on the right end surface of the expansion cylinder 2. The right end of the threaded section 1c protrudes from the central hole on the right end surface of the expansion cylinder 2 and engages with the nut 3. On the outer cylinder of the expansion cylinder 2 There are 3-6 blind grooves 2c extending axially and penetrating the side wall of the expansion cylinder 2 on the surface. The blind grooves 2c are evenly distributed along the circumference.

The utility model has the advantages that it has universality for cylindrical parts with different inner diameters, reduces the number of clamps, and reduces the processing cost. The utility model realizes the clamping of the cylindrical parts through the expansion effect of the expansion cylinder, which makes the clamping force of the cylindrical parts evenly distributed, reduces the clamping deformation of the cylindrical parts, and also avoids the difficulty of the mandrel in the traditional process. Disadvantages of wear and tear. This new type of use is particularly suitable for mass production.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below the utility model is described in further detail. Referring to Fig. 1, a jig for grinding cylindrical parts is characterized in that it consists of a mandrel 1, an expansion cylinder 2 and a nut 3; the mandrel 1 is a stepped shaft, and from left to right are optical axis sections 1a , circular platform section 1b and thread section 1c, the outer diameter of optical axis section 1a is greater than the inner hole diameter of the cylindrical part 4 to be ground, and smaller than the outer diameter of the cylindrical part 4 to be ground, at the left end of the optical axis section 1a There is a central positioning hole 1d on the surface, the diameter of the left end of the circular platform section 1b is greater than the diameter of the right end, the diameter of the left end of the circular platform section 1b is smaller than the diameter of the optical axis section 1a, the left end of the circular platform section 1b is coaxially connected with the right end of the optical axis section 1a, and the circular platform section 1b The cone angle α=12°～30°, the axial length of the truncated section 1b is not less than the length of the cylindrical part 4 to be ground, the left end of the threaded section 1c is coaxially connected with the right end of the truncated section 1b, and the threaded section 1c There is a central positioning hole 1e in the threaded section on the right end surface. The expansion cylinder 2 is a cylinder with an open left port. The diameter of the outer cylindrical surface of the expansion cylinder 2 matches the inner hole of the cylindrical part 4 to be ground. The cavity is a truncated conical inner cavity 2a, the cone angle of the truncated conical inner cavity 2a is α, and the maximum inner diameter of the truncated conical inner cavity 2a is greater than the middle diameter of the mandrel 1 circular truncated section 1b and is less than the maximum diameter of the mandrel 1 circular truncated section 1b, the circle The minimum diameter of the frustum-shaped inner chamber 2a is smaller than the minimum diameter of the circular frustum section 1b of the mandrel 1, and the expansion cylinder 2 is sleeved on the circular frustum section 1b of the mandrel 1, and the frustum-shaped inner chamber 2a of the expansion cylinder 2 is in the same circle as the circular frustum section 1b of the mandrel 1. There is a center hole on the right end surface of the expansion cylinder 2. The right end of the threaded section 1c protrudes from the center hole on the right end surface of the expansion cylinder 2 and engages with the nut 3. There is a hole on the outer cylindrical surface of the expansion cylinder 2. 3-6 blind grooves 2c extending axially and penetrating the side wall of the expansion cylinder 2 , the blind grooves 2c are evenly distributed along the circumference, and the notches of the blind grooves 2c are located on the left edge of the expansion cylinder 2 .

In order to facilitate the removal of the expansion cylinder 2, there is a through threaded hole 2b on the right end surface of the expansion cylinder 2. Use a screw to screw in from the threaded hole 2b to withstand the right end face of the circular platform section 1b of the mandrel 1, and the expansion cylinder 2 can be easily taken out.

The method of using the utility model is as follows: firstly, an expansion cylinder whose diameter of the outer cylindrical surface and the inner hole of the cylindrical part to be ground are in clearance fit, the cylindrical part to be ground is set on the expansion cylinder, and then the expansion cylinder Put it on the upper cylinder of the round table section of the mandrel, tighten the nut at the right end, the diameter of the outer cylindrical surface of the expansion cylinder will become larger, and the cylindrical parts to be ground will be tightened. At this time, the cylindrical parts can be cylindrically ground by positioning the center holes at both ends of the mandrel on the grinding machine. After the grinding is finished, screw the screw in through the threaded hole of the expansion cylinder, press against the right end face of the mandrel truncated section, and take out the expansion cylinder.

Claims (2)

1. cylinder part cylindrical grinding anchor clamps, it is characterized in that: it is made up of mandrel [1], expansion cylinder [2] and nut [3]; Mandrel [1] is a step axle, it from left to right is respectively optical axis section [1a], round platform section [1b] and thread segment [1c], the external diameter of optical axis section [1a] is greater than the diameter of bore of cylinder part to be ground [4], and less than the outside diameter of cylinder part to be ground [4], in the left side of optical axis section [1a] center positioning hole [1d] is arranged, the left end diameter of round platform section [1b] is greater than the right-hand member diameter, the left end diameter of round platform section [1b] is less than the diameter of optical axis section [1a], the coaxial connection of right-hand member of the left end of round platform section [1b] and optical axis section [1a], cone angle=12 of round platform section [1b] °～30 °, the axial length of round platform section [1b] is not less than the length of cylinder part to be ground [4], the coaxial connection of right-hand member of the left end of thread segment [1c] and round platform section [1b], in the right side of thread segment [1c] thread segment center positioning hole [1e] is arranged, expansion cylinder [2] is the cylinder that a left port is opened wide, the endoporus matched in clearance of the diameter of the external cylindrical surface of expansion cylinder [2] and cylinder part to be ground [4], the inner chamber of expansion cylinder [2] is truncated cone-shaped inner chamber [2a], the cone angle of truncated cone-shaped inner chamber [2a] is α, the maximum inner diameter of truncated cone-shaped inner chamber [2a] is greater than the middle footpath of mandrel [1] round platform section [1b] and less than the maximum gauge of mandrel [1] round platform section [1b], the minimum diameter of truncated cone-shaped inner chamber [2a] is less than the minimum diameter of mandrel [1] round platform section [1b], expansion cylinder [2] is enclosed within on the round platform section [1b] of mandrel [1], the truncated cone-shaped inner chamber [2a] of expansion cylinder [2] is fitted with the round table surface of mandrel [1] round platform section [1b], there is centre bore right side at expansion cylinder [2], the right-hand member head of thread segment [1c] stretches out and meshes with nut [3] from the centre bore of expansion cylinder [2] right side, having 3～6 at the external cylindrical surface of expansion cylinder [2] stretches vertically, connect the blind groove [2c] of expansion cylinder [2] sidewall, blind groove [2c] is uniformly distributed along the circumference, and the notch of blind groove [2c] is positioned at the left hand edge of expansion cylinder [2].

2. cylinder part cylindrical grinding anchor clamps according to claim 1 is characterized in that: the screwed hole [2b] that a perforation is arranged in the right side of expansion cylinder [2].

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