Machining method for small-aperture semi-blind group holes

Abstract

The invention relates to a machining method of small-aperture semi-blind group holes, which comprises the following steps of: machining a workpiece on a gantry numerical control machining center by adopting a gun drill for drilling, clamping and fixing by using V-shaped iron, fixing one end surface by using an auxiliary support, respectively marking cross alignment lines on the two end surfaces at one time for positioning, firstly performing coordinate positioning on each hole of the other end surface, and then positioning the hole of the other end surface; the method comprises the following steps of: drilling guide holes of various holes, drilling holes step by step by using gun drills with different length specifications according to reasonable processing parameters, after all holes of one end face are drilled, turning around a workpiece, verifying that a cross alignment line has no displacement, fixing the drilled end face by an auxiliary support, and drilling guide holes and gun drills of a second end face. According to the small-aperture semi-blind group hole machining method, the machining efficiency is improved by formulating a special clamping alignment method, a small hole machining sequence, a machining method and cutting parameters, and the machining requirements of the small-aperture semi-blind group holes are met.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical processing technology, and specifically relates to a machining method for a small-diameter semi-blind group hole. By formulating a special clamping and alignment method, a small hole processing sequence, a processing method, and cutting parameters, the processing efficiency is improved and the processing requirements of the small-diameter semi-blind group hole are met. Background Art

[0002] At present, workpieces with small-diameter semi-blind group holes are relatively rare. There are a series of small holes on the end face of the workpiece. The holes are divided into several specifications. The holes are semi-blind through holes with small diameters and deep depths. Some of the holes have threaded holes. The conventional mechanical processing method for this kind of workpiece is to first mark the center positions of the holes on the two end faces on the marking platform, punch the holes, and then drill small holes on the two end faces of the workpiece on an ordinary drilling machine. Using this processing method, the processing cycle is long and the efficiency is low. The long drill bit is easy to break in the hole and is difficult to remove. The two end faces need to be marked with hole position lines respectively, and the marking is manual, with large errors and low hole positioning accuracy. To overcome the above problems, it is necessary to select suitable equipment, alignment methods, formulate special processing sequences, processing tools and processing plans. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a workpiece ( Figure 1 ) processing, overcome the deficiencies in the prior art and provide a method to overcome the deficiencies in conventional processing methods by adopting a reasonable alignment clamping method, suitable processing equipment, a reasonable processing sequence of each hole, a reasonable processing method, and reasonable processing parameters. The hole processing of this workpiece is selected to use a gun drill to drill holes on a gantry CNC machining center. First, use a gun drill to test drill on the head of the same material to formulate reasonable gun drill drilling processing parameters. Then process the workpiece on the gantry CNC machining center, use a V-shaped iron clamp to fix it during clamping, and use auxiliary support to fix one end face. Draw a cross alignment line on both end faces for positioning at one time. First, coordinate the holes of the other end face, drill each hole, and then use gun drills of different lengths and reasonable processing parameters to drill in steps. After all the holes on one end face are drilled, turn the workpiece around, verify the cross alignment line, and use auxiliary support to fix the end face that has been drilled. Then, drill the second end face and drill the hole, thereby realizing the processing of workpieces with small-diameter semi-blind group holes.

[0004] The object of the present invention is achieved as follows: A machining method for a small-diameter semi-blind group hole, wherein a small-diameter semi-blind group hole workpiece is machined on a gantry CNC machining center, and a gun drill is used in conjunction with a high-pressure water pump to machine the group holes. The specific steps are as follows: Step 1) Fix the workpiece on the gantry CNC machining center for processing: First, fix the workpiece on the workbench of the gantry CNC machining center with a V-type clamp, and fix one end with an auxiliary support. Then, install the gun drill on the spindle of the gantry CNC machining center, connect the outlet pipe of the high-pressure water pump to the gun drill, and connect the water inlet pipe of the high-pressure water pump to the water tank of the gantry CNC machining center. The high-pressure water pump generates high-pressure water to cooperate with the gun drill to drill holes on the workpiece, and the water on the workbench flows back to the water tank. Step 2) Clamp and position the workpiece: fix the workpiece on the workbench of the gantry CNC machining center through a V-shaped clamp. After it is firmly fixed, draw cross alignment lines on both end faces of the workpiece, use auxiliary supports to fix the left end face, and drill the right end face with a gun drill. After the gun drill has drilled the right end face, the auxiliary support is replaced to fix the right end face, and verify whether the cross alignment line on the left end face of the workpiece is shifted. After confirming that there is no shift, drill the left end face with a gun drill. Step 3), the drilling method and sequence of the workpiece are as follows: Before drilling, draw the coordinate diagram of each hole, locate the coordinates of each hole with the center of the end face circle, find the center of the workpiece on the end face, locate the center position of each hole according to the coordinates, and use the center drill to mark the position, and then drill after checking the position is correct; When drilling an end face hole, divide the holes of an end face into different specifications, and drill holes of one specification first. When all holes of this specification are drilled, drill holes of another specification. Each hole size is drilled in a step-by-step manner: first, a 50mm hole is drilled, then a gun drill of different lengths is used. Drilling: The length of each gun drill differs by 200mm. Use the gun drills to drill holes in sequence, first the short one and then the long one. Step 4) The method of drilling with a gun drill is set as follows: Before using the gun drill, first use a material of the same material to test drill with the gun drill to determine reasonable processing parameters. After determining the processing parameters, process according to the determined processing parameters. When drilling with a gun drill, after drilling to a certain depth, withdraw and check the condition of the blade, and replace or sharpen the gun drill in time according to the condition of the blade.

[0005] In step 4), the processing parameters of gun drilling are set as follows: when gun drilling, the water pump pressure requirement is: φ14 reaches more than 3Mp, φ6, φ5 reach more than 5Mp, and φ3 needs to reach more than 7Mp; when gun drilling, the cutting parameter requirements are as follows: a, Φ3 hole, gun drill speed 1000r / min, feed 10mm / min; b, Φ6 hole, gun drill speed 1000r / min, feed 10mm / min; c, Φ14 hole, gun drill speed 325r / min, feed 10mm / min; d, Φ5 hole, gun drill speed 1000r / min, feed 10mm / min; e, Φ30 hole, gun drill speed 300r / min, feed 10mm / min.

[0006] The present invention has the following beneficial effects: the present invention solves the technical problem of difficult processing of workpieces with small-diameter semi-blind hole groups, and overcomes the processing deficiencies of conventional processing methods by adopting a reasonable alignment and clamping method, suitable processing equipment, a reasonable processing sequence of each hole, a reasonable processing method, and reasonable processing parameters, thereby improving the processing efficiency of small-diameter semi-blind hole groups and ensuring the position accuracy of each hole in the small-diameter semi-blind hole group. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of a small-diameter semi-blind hole group of the present invention.

[0008] Figure 2 It is a left view of the small-aperture semi-blind hole group of the present invention.

[0009] Figure 3 It is a schematic diagram of the use of the processing equipment of the present invention.

[0010] Figure 4 This is the front view of the clamping and positioning of the workpiece of the present invention.

[0011] Figure 5 It is a cross-sectional view of the clamping and positioning when punching the right end surface of the workpiece of the present invention.

[0012] Figure 6 It is a schematic diagram of clamping and positioning when punching the left end surface of a workpiece of the present invention.

[0013] Figure 7 Schematic diagram of the coordinates of the hole of the present invention.

[0014] In the figure: Item 1 is the workpiece; Item 2 is the water inlet pipe of the high-pressure water pump; Item 3 is the high-pressure water pump; Item 4 is the water outlet pipe of the high-pressure water pump; Item 5 is the gun drill; Item 6 is the V-type card set; Item 7 is the auxiliary support part; Item 8 is the gantry CNC machining center; Item 9 is the workbench of the gantry CNC machining center. DETAILED DESCRIPTION

[0015] Embodiment 1: As shown in the figure, a machining method for a small-diameter semi-blind group hole is used to machine a small-diameter semi-blind group hole workpiece on a gantry CNC machining center, and a gun drill is used in conjunction with a high-pressure water pump to machine the group holes. The specific steps are as follows: Step 1), fix the workpiece on the gantry CNC machining center 8 for processing: first, fix the workpiece 1 on the workbench 9 of the gantry CNC machining center 8 by using a V-type clamp group 6, and fix one end with an auxiliary support 7, then install the gun drill 5 on the spindle of the gantry CNC machining center, connect the outlet pipe 4 of the high-pressure water pump 3 to the gun drill, and connect the water inlet pipe 2 of the high-pressure water pump to the water tank of the gantry CNC machining center. The high-pressure water pump generates high-pressure water to cooperate with the gun drill to drill holes on the workpiece, and the water on the workbench flows back to the water tank; Step 2) Clamp and position the workpiece: fix the workpiece 1 on the workbench 9 of the gantry CNC machining center through the V-type clamping group 6. After it is firmly fixed, draw cross alignment lines on both end faces of the workpiece, use the auxiliary support 7 to fix the left end face, and the gun drill 5 drills the right end face hole; after the gun drill drills the right end face hole, the auxiliary support is replaced to fix the right end face, and verify whether the cross alignment line of the left end face of the workpiece is shifted. After confirming that there is no shift, the gun drill drills the left end face hole; Step 3), the drilling method and sequence of the workpiece are as follows: Before drilling, draw the coordinate diagram of each hole, locate the coordinates of each hole with the center of the end face circle, find the center of the workpiece on the end face, locate the center position of each hole according to the coordinates, and use the center drill to mark the position, and then drill after checking the position is correct; When drilling an end face hole, divide the holes of an end face into different specifications, and drill holes of one specification first. When all holes of this specification are drilled, drill holes of another specification. Each hole size is drilled in a step-by-step manner: first, a 50mm hole is drilled, then a gun drill of different lengths is used. Drilling: The length of each gun drill differs by 200mm. Use the gun drills to drill holes in sequence, first the short one and then the long one. Step 4) The gun drill drilling method is set as follows: Before using a gun drill, first use a material of the same type to test drill with the gun drill to determine reasonable processing parameters. After determining the processing parameters, process according to the determined processing parameters. When drilling with a gun drill, after drilling to a certain depth, withdraw and check the condition of the blade, and replace or sharpen the gun drill in time according to the condition of the blade.

[0016] The gun drill drilling parameters are set as follows: When drilling with a gun drill, the water pump pressure requirement is: φ14 should reach 3Mp or more, φ6 and φ5 should reach 5Mp or more, and φ3 should reach 7Mp or more; When drilling with a gun drill, the cutting parameters are as follows: a. Φ3 hole, gun drill speed 1000r / min, feed 10mm / min; b. Φ6 hole, gun drill speed 1000r / min, feed 10mm / min; c. Φ14 hole, gun drill speed 325r / min, feed 10mm / min; d. Φ5 hole, gun drill speed 1000r / min, feed 10mm / min; e. Φ30 hole, gun drill speed 300r / min, feed 10mm / min.

[0017] The implementation of the technical solution of the present invention mainly lies in four points, which are as follows: 1. Use appropriate processing equipment to process workpieces with small-diameter semi-blind group holes: use a gantry CNC machining center, a high-pressure water pump, and a gun drill to process the group holes.

[0018] 2. When processing workpieces with small-diameter semi-blind holes, adopt a reasonable alignment and clamping method: use a V-type clamp set and auxiliary supports to clamp the workpiece, and align the line at the cross of the workpiece at one time.

[0019] 3. When processing workpieces with small-diameter semi-blind group holes, a reasonable drilling method and sequence should be used: before drilling, draw the coordinate diagram of each hole, locate the coordinates of each hole with the center of the end face circle, find the center of the workpiece circle on the end face, locate the center of each hole according to the coordinates, and use the center drill to mark the position. After verifying the position, drill the holes. When drilling an end face hole, divide the holes of an end face according to the specifications, drill one specification of holes first, and when all the holes of this specification are drilled, drill another specification. Each specification of holes is carried out in steps: first drill the lead hole to a depth of 50mm, and then use gun drills of different lengths to drill holes. The length of each length of the gun drill differs by 200mm, and the gun drills are used to drill holes in sequence from short to long.

[0020] 4. Before processing a workpiece with a small-diameter semi-blind group of holes, first use a gun drill with a head of the same material to test drill and determine reasonable processing parameters. After determining the processing parameters, process according to the determined processing parameters.

Claims

1. A machining method for a small-diameter semi-blind group of holes, characterized in that: The small-diameter semi-blind group hole workpiece is processed on the gantry CNC machining center. The group holes are processed using a gun drill and a high-pressure water pump. The specific steps are as follows: Step 1), fix the workpiece on the gantry CNC machining center (8) for processing: first, fix the workpiece (1) on the workbench (9) of the gantry CNC machining center (8) using a V-type clamp group (6), and fix one end using an auxiliary support member (7), then install the gun drill (5) on the spindle of the gantry CNC machining center, connect the water outlet pipe (4) of the high-pressure water pump (3) to the gun drill, and connect the water inlet pipe (2) of the high-pressure water pump to the water tank of the gantry CNC machining center. The high-pressure water pump generates high-pressure water to cooperate with the gun drill to drill a hole on the workpiece, and the water on the workbench flows back to the water tank; Step 2) Clamp and position the workpiece: fix the workpiece (1) on the worktable (9) of the gantry CNC machining center by means of a V-shaped clamping assembly (6), and after the workpiece is firmly fixed, draw cross alignment lines on both end faces of the workpiece, use an auxiliary support (7) to fix the left end face, and use a gun drill (5) to drill the right end face hole; after the gun drill has drilled the right end face hole, the auxiliary support is replaced to fix the right end face, and verify whether the cross alignment line on the left end face of the workpiece is displaced. After confirming that there is no displacement, the gun drill is used to drill the left end face hole; Step 3), the drilling method and sequence of the workpiece are as follows: Before drilling, draw the coordinate diagram of each hole, locate the coordinates of each hole with the center of the end face circle, find the center of the workpiece on the end face, locate the center position of each hole according to the coordinates, and use the center drill to mark the position, and then drill after checking the position is correct; When drilling an end face hole, divide the holes of an end face into different specifications, and drill holes of one specification first. When all holes of this specification are drilled, drill holes of another specification. Each hole size is drilled in a step-by-step manner: first, a 50mm hole is drilled, then a gun drill of different lengths is used. Drilling: The length of each gun drill differs by 200mm. Use the gun drills to drill holes in sequence, first the short one and then the long one. Step 4) The gun drill drilling method is set as follows: Before using a gun drill, first use a material of the same type to test drill with the gun drill to determine reasonable processing parameters. After determining the processing parameters, process according to the determined processing parameters. When drilling with a gun drill, after drilling to a certain depth, withdraw and check the condition of the blade, and replace or sharpen the gun drill in time according to the condition of the blade.

2. A machining method for a small-diameter semi-blind hole group according to claim 1, characterized in that: In step 4), the processing parameters of gun drilling are set as follows: when drilling with a gun drill, the water pump pressure requirement is: φ14 reaches more than 3Mp, φ6, φ5 reaches more than 5Mp, and φ3 needs to reach more than 7Mp; when drilling with a gun drill, the cutting parameter requirements are as follows: a. For φ3 holes, the gun drill speed is 1000r / min, and the feed is 10mm / min; b. For φ6 holes, the gun drill speed is 1000r / min, and the feed is 10mm / min; c. Φ14 hole, gun drill speed 325r / min, feed 10mm / min; d. Φ5 hole, gun drill speed 1000r / min, feed 10mm / min; e. Φ30 hole, gun drill speed 300r / min, feed 10mm / min.

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