CN109108587B

CN109108587B - Machining process for main shaft hole of cutting chamber frame

Info

Publication number: CN109108587B
Application number: CN201811283354.6A
Authority: CN
Inventors: 郝红光; 罗存鑫; 丁晓; 黄德华; 张严芳; 李生业
Original assignee: Qingdao Zichai Boyang Diesel Engine Co ltd
Current assignee: Qingdao Zichai Boyang Diesel Engine Co ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2020-08-11
Anticipated expiration: 2038-10-31
Also published as: CN109108587A

Abstract

The invention discloses a machining process of a main shaft hole of a cutting chamber frame.A machine tool accessory head rotates 180 degrees and then extends into the cutting chamber frame, two Z-direction coordinate values of the upper point and the lower point of the main shaft hole are punched by taking two machined side holes as references, a Z-direction zero point is determined, X-direction coordinate values with the same height of the two holes are punched, and an X-direction zero point is determined, so that a workpiece coordinate system after the accessory head rotates is determined. By adopting the processing method, the zero point of the workpiece coordinate system does not need to be calculated and compensated manually, even if the accessory head has a rotation precision error, the processing precision of the coaxiality of the main shaft hole of the cutting chamber frame is not influenced, and only the processed hole is used as a reference to determine the zero point.

Description

Machining process for main shaft hole of cutting chamber frame

Technical Field

The invention relates to the field of diesel engine component processing, in particular to a process for processing a main shaft hole of a cutting chamber frame.

Background

In the process of processing a cutting chamber frame of a certain model, the workpiece precision requirement of the company is high (see fig. 1), the coaxiality of a main shaft hole is required to be guaranteed to be 0.03mm in the center, and due to the problem of machine tool precision, the deviation is large after an accessory head rotates 180 degrees in the process of processing the main shaft hole, and the coaxiality is not easy to guarantee.

Some model cutting chamber frame both ends respectively have two holes, the diameter is in 280mm, dark 300mm, and the terminal surface distance 978mm in two holes of same main shaft (as figure 5, hole 1, hole 2 is same main shaft hole, hole 3, hole 4 is same main shaft hole), the bottom surface has the wide 720 mm's of a length 680mm inside casing, two main shaft hole centre-to-centre distances are 385mm, two holes of same main shaft require the axiality in 0.03mm, the main shaft central line is 0.03mm with the bottom surface parallel degree (figure 1). Due to the rotation precision problem of the numerical control gantry boring and milling machine, after the accessory head rotates 180 degrees, the precision detection is carried out by using a 300mm long detection rod, the upper bus is 0.1mm, and the side bus is 0.05 mm.

The prior art is as follows: and respectively determining zero points of a workpiece coordinate system by taking the bottom surface and the side surface as references, rotating the machine tool accessory head by 180 degrees after the holes 1 and 3 are machined, and then re-determining the zero points of the workpiece coordinate system by taking the bottom surface and the side surface as references. And then, considering the precision errors of the bus and the side bus on the machine tool accessory head, and calculating and compensating the precision errors to a zero point of a workpiece coordinate system so as to eliminate the influence of the rotation precision of the accessory head on the machining. However, this process has certain disadvantages: 1. the deviation value of the machine tool accessory head after rotation needs to be calculated manually, and the zero point of the coordinate system is modified manually, so that errors are easy to calculate in the process, and the compensation direction is easy to mistake; 2. a machining error exists after the datum plane is machined, and therefore a certain error exists when the datum plane is used for machining the zero point of the workpiece coordinate system.

Chinese patent CN201420183623.2 discloses a rotary coaxial processing lathe, which comprises a base, a hydraulic cylinder, a clamp body, a connecting flange plate, a workpiece, a locking bolt, a rear elastic sleeve, an elastic cone, a sliding chute, a supporting column, a fixed rotating plate, a processed part, a motor, a rubber washer and a mounting hole; this utility model discloses can the quick fixed gyration type work piece, the axiality is high, and machining height is adjustable, and machined part accessible motor control rotates, and the processing of being convenient for effectively improves production efficiency, reduces dependent manual operation. However, such a lathe cannot machine a specific workpiece, and the problem of machining a coaxial hole is not solved.

Disclosure of Invention

In order to solve the problem that machining errors of existing cutting chamber frame spindle holes are large, a machining process for the cutting chamber frame spindle holes is provided, machining errors are reduced, and machining accuracy is accurately guaranteed to meet the technical requirements of drawings.

The invention is realized by the following technical scheme:

in order to achieve the purpose, the invention provides a machining process of a main shaft hole of a cutting chamber frame, which is characterized by comprising the following machining steps:

(1) finish machining the bottom surface and the side surface of the cutting chamber, determining a zero point of a workpiece coordinate system by taking the bottom surface and the side surface as references, and machining two main shaft holes on one side surface of the cutting chamber through an accessory head; the machining in the step is carried out according to the machining mode of a normal workpiece, a coordinate system is determined by taking the bottom surface and the side surface of the existing cutting chamber as references, 2 spindle holes in a single side surface are precisely machined, and the single-side precision is guaranteed;

(2) after finishing processing two main shaft holes on the single side surface, rotating the accessory head by 180 degrees, and extending into the accessory head from the inner frame on the bottom surface of the cutting chamber; because the bottom surface of the cutting chamber is provided with the inner frame, when the whole cutting chamber is fixed on a machine tool, the accessory head can extend into the cutting chamber from the bottom, rotate 180 degrees, back to the processed spindle hole and face to the unprocessed single side surface;

(3) selecting Z-axis coordinate values of the highest point and the lowest point of the spindle hole as a point selection target of a new reference, and taking the middle number of the two as a Z-axis zero point of the new reference; re-establishing a coordinate system, taking the processed spindle hole as the reference of a new coordinate system, ensuring that the axis does not generate errors due to the whole size problem of the cutting chamber, and adding the Z-axis coordinate values of the highest point and the lowest point of the spindle hole and dividing by two to obtain the Z-axis zero point of the new coordinate system;

(4) selecting random points with the same height in two machined spindle holes, and taking the middle number of X-axis coordinate values of the random points as a new standard X-axis zero point; similarly, establishing a new coordinate system X-axis zero point, and adding four or two points with the same height, and dividing the sum by 4 or 2 to obtain the value of the X-axis zero point;

(5) establishing a new coordinate system by using the new X-axis zero point and the Z-axis zero point, and processing two main shaft holes on the other side of the cutting chamber by using the new coordinate system as a reference; and (3) after the new coordinate system is established, repositioning the positions of the two main shaft holes on the other side surface according to the point taking mode in the step (1), and machining through an accessory head of the machine tool.

Preferably, the accessory head is a machine tool machining operating head, the whole cutting chamber is arranged on the machine tool, and the accessory head is a main operating tool.

Preferably, the random points are 2 or 4, and when the point is the top point or the bottom point of the spindle hole, the number of the random points is 2, and the other number is 4.

The invention has the beneficial effects that:

1. by adopting the processing method, the zero point of the workpiece coordinate system does not need to be calculated and compensated manually, even if the accessory head has a rotation precision error, the processing precision of the coaxiality of the main shaft hole of the cutting chamber frame is not influenced, and only the processed hole is used as a reference to determine the zero point.

Drawings

FIG. 1 is a schematic cross-sectional view of a cutting chamber of the present invention;

FIG. 2 is a schematic side view of the cutting chamber of the present invention;

FIG. 3 is a schematic front view of a cutting chamber according to the present invention;

FIG. 4 is a perspective view of the cutting chamber of the present invention;

FIG. 5 is a diagram illustrating the location of an aperture according to the present invention;

FIG. 6 is a schematic view of the present invention along the X-axis and Z-axis.

In the figure: 1-well 1; 2-well 2; 3-well 3; 4-well 4; 5-attachment head; 6-cutting chamber.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

Referring to fig. 1-4, a process for machining a spindle hole of a cutting chamber frame includes the following steps:

(1) referring to fig. 5, the bottom surface and the side surface of the finish machining cutting chamber 6 are used as the reference to determine the zero point of the workpiece coordinate system, and two spindle holes on one side surface of the cutting chamber are machined through the accessory head;

(2) after finishing processing two main shaft holes on the single side surface, the accessory head 5 rotates 180 degrees and extends into the accessory head from the inner frame on the bottom surface of the cutting chamber;

(3) referring to fig. 6, the two processed spindle holes are used as point selection targets of a new reference, Z-axis coordinate values of the highest point and the lowest point of the spindle holes are selected, and the middle number between the two is taken as a Z-axis zero point of the new reference;

(4) selecting random points with the same height in two machined spindle holes, and taking the middle number of X-axis coordinate values of the random points as a new standard X-axis zero point;

(5) and establishing a new coordinate system by using the new X-axis zero point and the new Z-axis zero point, and processing two main shaft holes on the other side of the cutting chamber by using the new coordinate system as a reference.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A machining process for a spindle hole of a cutting chamber frame is characterized by comprising the following machining steps:

(1) finish machining the bottom surface and the side surface of the cutting chamber, determining a zero point of a workpiece coordinate system by taking the bottom surface and the side surface as references, and machining two main shaft holes on one side surface of the cutting chamber through an accessory head;

(2) after finishing processing two main shaft holes on the single side surface, rotating the accessory head by 180 degrees, and extending into the accessory head from the inner frame on the bottom surface of the cutting chamber;

(3) the two machined spindle holes are used as point selection targets of new standards, Z-axis coordinate values of the highest point and the lowest point of each spindle hole are selected, and the middle number of the two is taken as the Z-axis zero point of each new standard;

(4) selecting random points with the same height in two machined spindle holes, and taking the middle number of X-axis coordinate values of the random points as X-axis zero points of respective new references;

2. The machining process for the spindle hole of the cutting chamber frame as claimed in claim 1, wherein the attachment head is a machine tool machining operating head.

3. The machining process for the spindle hole of the cutting chamber frame as claimed in claim 1, wherein the random number of the points is 2 or 4.